Showing posts with label fabric costing. Show all posts
Showing posts with label fabric costing. Show all posts

Sunday, 31 May 2026

Which Fabric Is Cheaper: Low Count Fabric or High Count Fabric?



Which Fabric Is Cheaper: Low Count Fabric or High Count Fabric?

When we buy or cost fabric, one common question comes up again and again: which fabric is cheaper — low count fabric or high count fabric? At first glance, the answer looks simple. Low count yarn is coarser, so it should be cheaper. High count yarn is finer, so it should be more expensive.

But in actual textile costing, this answer is only partly correct. The more accurate answer is that low count yarn is generally cheaper per kg, but low count fabric is not always cheaper per metre. Fabric price depends not only on yarn count, but also on construction, GSM, weave, yarn quality, processing, finishing, width, order quantity, and market conditions.







Visual 1: Low count versus high count yarn and how it affects fabric cost.

Table of Contents

What Does Yarn Count Mean?

In cotton fabrics, yarn count is often expressed in the English count system, written as Ne, s, or simply count. For example, we may say 20s cotton, 40s cotton, 60s cotton, or 80s cotton. In the cotton count system, a higher count means a finer yarn.

So, 40s cotton is finer than 20s cotton. Similarly, 60s cotton is finer than 40s cotton. This is sometimes confusing because in direct systems such as tex or denier, a higher number means a thicker yarn. But in the English cotton count system, the relationship is the opposite.

Simple memory rule: In cotton Ne count, the higher the number, the finer the yarn.

Is Low Count Yarn Cheaper?

Generally, yes. Low count yarns such as 10s, 16s, 20s, or 24s are coarser yarns. They are usually easier to spin than very fine yarns and may not always require the same level of fibre length, fineness, and spinning control needed for fine counts.

Low count yarns are commonly used in heavier or more robust fabrics such as denim, canvas, drill, towels, coarse sheeting, bags, and industrial fabrics. Because of this, low count yarn is usually cheaper per kg than fine count yarn.

High count yarns such as 60s, 80s, 100s, or 120s are finer yarns. They need better fibre, better spinning control, often combing or compact spinning, and better yarn evenness. Their production is more demanding, and therefore they usually cost more per kg.

Why Low Count Fabric May Not Always Be Cheaper

Fabric is not sold only by yarn count. Fabric is sold by construction, weight, quality, width, processing, and finish. A low count yarn is thick. When thick yarn is used in a fabric, the fabric may become heavier and consume more yarn per metre.

This is the important costing trap. Even if the yarn is cheaper per kg, the fabric may use more kg of yarn per metre. That higher material consumption can make the fabric cost higher than expected.

For example, a 10s or 12s denim fabric may use coarse yarn, but it may also have high GSM, indigo dyeing, sizing, weaving, finishing, washing, and process losses. So denim is not automatically cheap just because it uses low count yarn.

Similarly, canvas may use coarse yarn, but because it is dense and heavy, its yarn consumption per metre can be high. Therefore, the better statement is not “low count fabric is cheap.” The better statement is: low count yarn is cheaper per kg, but low count fabric may become costly if it is heavy, dense, or highly processed.

Visual 2: Fabric cost depends on count, EPI, PPI, GSM, weave, yarn quality and finishing.

What Is Fabric Construction?

Fabric construction tells us how the fabric is built. A woven fabric construction is often written like this:

40 × 40 / 120 × 60

This means that the warp yarn count is 40s, the weft yarn count is 40s, the EPI is 120, and the PPI is 60. EPI means ends per inch, which tells us how many warp yarns are present in one inch of fabric width. PPI means picks per inch, which tells us how many weft yarns are inserted in one inch of fabric length.

Part of Construction Meaning Costing Importance
Warp count Fineness or coarseness of warp yarn Affects warp yarn cost, strength and appearance
Weft count Fineness or coarseness of weft yarn Affects weft yarn cost, handle and fabric weight
EPI Ends per inch Higher EPI generally means more warp yarn consumption
PPI Picks per inch Higher PPI generally means more weft yarn consumption

Yarn count tells us the thickness or fineness of yarn, while EPI and PPI tell us how densely those yarns are packed in the fabric. This is where fabric costing becomes practical. A 40s × 40s fabric with low EPI and PPI may be cheaper than a 40s × 40s fabric with high EPI and PPI. Both use the same count, but the second fabric uses more yarn per square metre.

Why GSM Is Important in Fabric Costing

GSM means grams per square metre. It tells us how heavy the fabric is. For costing, GSM is extremely important because it gives an idea of how much material is present in the fabric.

A 100 GSM fabric consumes less material than a 300 GSM fabric, assuming the same fibre and processing level. Low count fabrics are often heavier because the yarns are thicker. High count fabrics are often lighter, but if they are woven very densely, their GSM can also be high.

A commonly used approximate relationship for woven cotton fabric GSM is:

\( \text{Fabric GSM} = \left(\frac{\text{EPI}}{\text{Warp Count}} + \frac{\text{PPI}}{\text{Weft Count}}\right) \times (100 + \text{Crimp \%}) \times 0.2327 \)

This formula shows why count alone is not enough. If EPI and PPI increase, GSM increases. If count becomes coarser, GSM also tends to increase. Therefore, the fabric cost must be judged through the combined effect of yarn count, fabric density and crimp.

How Weave Affects Fabric Price

The weave also affects the fabric price. A plain weave is usually the simplest and most economical weave. It is easier to produce and generally gives better production efficiency.

Twill weave, satin weave, sateen weave, dobby weave, and jacquard weave may add cost because they can require more complex loom settings, lower speed, more design control, or special machinery. At the same yarn count and similar GSM, plain fabric is usually cheaper than dobby or jacquard fabric.

This is why fabric price is not just a yarn question. It is also a construction and manufacturing question. A fabric made with ordinary 40s yarn in plain weave may be much cheaper than another 40s fabric made with dobby design, fine finishing and premium yarn.

Role of Yarn Quality

Two fabrics may both be described as 40s cotton, but their prices may be different. One may use carded yarn and the other may use combed yarn. One may use ordinary ring-spun yarn and the other may use compact yarn. One may use short staple cotton and the other may use better long staple cotton.

Better yarn quality gives better appearance, strength, smoothness, lower hairiness, and better fabric hand feel. But it also increases cost. So when someone says “40s fabric,” the buyer should ask whether it is carded or combed, compact or normal ring-spun, single or ply, ordinary or mercerised, and what fibre quality is being used.

Practical point: Count tells us yarn fineness. It does not fully tell us yarn quality. Two yarns of the same count can differ greatly in fibre quality, evenness, strength, hairiness and price.

Role of Processing and Finishing

Processing can change the cost significantly. Grey fabric is cheaper than processed fabric. Dyed fabric is costlier than grey fabric. Printed fabric may be costlier than dyed fabric depending on the print method, number of colours, chemical use and process losses.

Mercerised cotton is costlier than non-mercerised cotton. Special finishes such as soft finish, wrinkle-free finish, water-repellent finish, peach finish, bio-polish, enzyme wash, calendaring or coating add further cost.

This means a low count fabric with heavy dyeing, washing, coating, or finishing can cost more than a high count grey fabric. Similarly, a high count fabric with premium finishing may become much more expensive than its yarn count alone suggests.

Visual 3: A practical decision matrix for judging whether a fabric is likely to be cheaper or costlier.

Practical Price Direction by Fabric Type

The following table gives a broad direction of fabric pricing logic. It should not be treated as a fixed price list because actual prices change with cotton rates, yarn market, processing charges, order quantity, mill efficiency and location.

Fabric Type Common Count Direction Price Tendency Reason
Coarse plain fabric 10s–20s Lower to medium Coarse yarn and simple weave, if GSM is not too high
Canvas 6s–20s Medium to high Heavy GSM and high yarn consumption
Denim 6s–20s Medium to high Coarse yarn but heavy fabric, indigo dyeing and finishing
Poplin 40s–80s Medium to high Fine yarn and usually denser construction
Cambric 40s–60s Medium Fine yarn, smooth fabric and good finish
Voile or lawn 60s–100s High Fine yarn, better fibre and premium handle
Sateen 40s–100s High Smooth surface, dense weave and better finishing
Dobby or jacquard Varies Higher Design complexity, lower speed and higher loom cost

A Better Way to Ask for Fabric Price

Instead of asking, “What is the price of 40s fabric?”, a better question is: “What is the price of 40s × 40s, 120 × 80, plain weave, 58-inch width, 120 GSM, dyed and finished fabric?”

This second question is much clearer because it includes the variables that actually affect cost. For sourcing and merchandising, the full specification should include fibre content, warp count, weft count, EPI, PPI, fabric width, GSM, weave, yarn type, grey or processed stage, dyeing or printing type, finishing, shrinkage requirement, order quantity and quality standard.

Only then can a supplier give a meaningful price. Without construction and processing details, count alone gives only a partial idea.

Final Conclusion

Low count fabric is usually cheaper only when it is made with simple construction, low to moderate GSM, ordinary yarn and basic finishing. High count fabric is usually more expensive when it uses fine yarn, dense construction, combed or compact yarn, better fibre and premium finishing.

However, a heavy low count fabric like denim or canvas may cost more per metre than a light high count fabric. Similarly, a high count fabric with simple low-density construction may not be as expensive as a dense premium shirting fabric.

Therefore, count is only the starting point of fabric costing. The correct way to judge fabric price is:

\( \text{Fabric Cost} = \text{Yarn Cost} + \text{Yarn Consumption} + \text{Weaving Cost} + \text{Processing Cost} + \text{Finishing Cost} + \text{Overheads} + \text{Margin} \)

In practical terms, this means we must always look at yarn count, construction, GSM, weave, yarn quality, processing and finishing together. Only then can we say whether a fabric is truly cheap or expensive.

Selected Sources

  1. Textile Exchange. Organic Cotton: A Fiber Classification Guide. Textile Exchange, 2017.
  2. National Textile Corporation Ltd. Yarn Price List dated 22.01.2026. NTC, 2026.
  3. Online Clothing Study. How to Calculate GSM of Woven Fabric from Its Construction.
  4. Fibre2Fashion. What is Cotton Yarn: Properties, Varieties, Uses and Global Market, 2025.
  5. Textile Study Center. Fabric Weight Calculation in GSM.

General Disclaimer

This article is for educational and general textile knowledge purposes only. Actual fabric prices vary according to cotton prices, yarn availability, mill source, spinning technology, weaving efficiency, processing charges, finishing quality, fabric width, wastage, order quantity, credit terms, transport, taxes and market conditions.

The price tendencies discussed here should be used as a costing logic, not as a fixed price quotation. Buyers, merchandisers and students should verify current yarn and fabric rates from suppliers before making commercial decisions.

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Thursday, 7 May 2026

Textile Calculation: Finding the Length and Weight of Yarn in a Given Length of Cloth



Finding the Length, Hanks, and Weight of Yarn in a Given Length of Cloth

This calculation is used in weaving to find how much weft yarn is required to produce a cloth of a given width, length, and number of picks per inch.

In simple terms, it answers the question:

If I weave this much fabric, how many yards, hanks, or pounds of weft yarn will I consume?

1. What Is Being Calculated?

In woven fabric, there are two main sets of yarns:

Yarn Direction Meaning
Warp Lengthwise yarns running along the length of the fabric
Weft Crosswise yarns inserted across the width of the fabric

This rule is mainly concerned with the weft yarn.

For example, if a fabric is 30 inches wide and has 60 picks per inch, it means that in every one inch length of cloth, there are 60 weft threads, and each weft thread runs across 30 inches of width.

Therefore, the weft yarn required for one inch length of cloth is:

\(30 \times 60 = 1800 \text{ inches of yarn}\)

This means that for every inch of cloth length, the loom consumes 1800 inches of weft yarn.

2. Main Rule

The basic rule is:

\[ \text{Yards of weft yarn in 1 yard of cloth} = \text{Width in inches} \times \text{Picks per inch} \]

In symbolic form:

\[ L = W \times P \]

Where:

  • \(L\) = yards of weft yarn in one yard of cloth
  • \(W\) = width of cloth in inches
  • \(P\) = picks per inch

3. Example: Length of Yarn in One Yard of Cloth

Suppose:

  • Width of cloth = 30 inches
  • Picks per inch = 60

\[ 30 \times 60 = 1800 \]

Therefore:

One yard of cloth requires 1800 yards of weft yarn.

This may appear surprising at first, but it is correct. Each pick travels across the full width of the cloth, and there are many picks in every inch of cloth length.

4. Example: Length of Yarn in 50 Yards of Cloth

If one yard of cloth requires 1800 yards of weft yarn, then 50 yards of cloth will require:

\[ 1800 \times 50 = 90{,}000 \]

Therefore:

50 yards of cloth require 90,000 yards of weft yarn.

The general formula becomes:

\[ \text{Total yards of yarn} = W \times P \times Y \]

Where:

  • \(W\) = width in inches
  • \(P\) = picks per inch
  • \(Y\) = length of cloth in yards

5. Converting Yarn Length into Hanks

After finding the total yarn length, it can be converted into hanks. Different yarn count systems use different hank lengths.

Yarn System One Hank Equals
Cotton 840 yards
Worsted 560 yards
Linen 300 yards
Woollen Varies according to the count system

The formula for hanks is:

\[ \text{Number of hanks} = \frac{\text{Total yards of yarn}}{\text{Yards per hank}} \]

6. Example: Converting 90,000 Yards into Worsted Hanks

For worsted yarn:

\[ 1 \text{ hank} = 560 \text{ yards} \]

Therefore:

\[ \frac{90{,}000}{560} = 160.71 \]

So:

90,000 yards = approximately 160.71 worsted hanks.

7. Example: Converting 90,000 Yards into Cotton Hanks

For cotton yarn:

\[ 1 \text{ hank} = 840 \text{ yards} \]

Therefore:

\[ \frac{90{,}000}{840} = 107.14 \]

So:

90,000 yards = approximately 107.14 cotton hanks.

8. Finding the Weight of Yarn

Once the number of hanks is known, the weight can be found using the yarn count.

In indirect count systems, such as cotton count or worsted count:

\[ \text{Count} = \frac{\text{Number of hanks}}{\text{Weight in pounds}} \]

Therefore:

\[ \text{Weight in pounds} = \frac{\text{Number of hanks}}{\text{Count}} \]

9. Example: Weight of 20s Worsted Yarn

We have already found:

\[ 160.71 \text{ worsted hanks} \]

If the yarn count is 20s:

\[ \frac{160.71}{20} = 8.035 \]

Therefore:

The weight of 20s worsted yarn required is approximately 8.04 lb.

10. Example: Weight of 20s Cotton Yarn

We have already found:

\[ 107.14 \text{ cotton hanks} \]

If the yarn count is 20s:

\[ \frac{107.14}{20} = 5.357 \]

Therefore:

The weight of 20s cotton yarn required is approximately 5.36 lb.

11. Complete Formula Set

Let:

  • \(I\) = width of cloth in inches
  • \(P\) = picks per inch
  • \(Y\) = length of cloth in yards
  • \(N\) = yards per hank
  • \(C\) = yarn count

Total Yarn Length

\[ \text{Total yarn length in yards} = I \times P \times Y \]

Number of Hanks

\[ \text{Hanks} = \frac{I \times P \times Y}{N} \]

Weight of Yarn

\[ \text{Weight} = \frac{I \times P \times Y}{N \times C} \]

12. Practical Example in One Table

Suppose the following details are known:

Item Value
Cloth width 30 inches
Picks per inch 60
Cloth length 50 yards
Yarn count 20s
Cotton hank length 840 yards
Worsted hank length 560 yards

Step-by-Step Calculation

Calculation Cotton Worsted
Total yarn length 90,000 yards 90,000 yards
Hanks \(90{,}000 / 840 = 107.14\) \(90{,}000 / 560 = 160.71\)
Weight for 20s yarn \(107.14 / 20 = 5.36\) lb \(160.71 / 20 = 8.04\) lb

Therefore, for the same cloth:

  • If the yarn is 20s cotton, the required weight is about 5.36 lb.
  • If the yarn is 20s worsted, the required weight is about 8.04 lb.

The difference arises because cotton and worsted systems define hank length differently.

13. Important Limitation: No Allowance for Shrinkage or Waste

The formula gives the theoretical yarn requirement. It does not include practical allowances such as:

  • weaving waste,
  • loom waste,
  • selvedge waste,
  • shrinkage,
  • crimp,
  • take-up,
  • pattern effect,
  • difference between reed width and finished width,
  • yarn contraction,
  • processing loss.

In actual weaving, the real yarn requirement will usually be higher than the theoretical value.

For example, if the theoretical requirement is 90,000 yards and a 5% allowance is added:

\[ 90{,}000 \times 1.05 = 94{,}500 \]

Therefore, the practical yarn requirement becomes:

94,500 yards

Similarly, for weight:

\[ 5.36 \times 1.05 = 5.63 \text{ lb} \]

So the practical cotton yarn requirement becomes approximately:

5.63 lb

14. Why No Fixed Allowance Is Given

A fixed wastage percentage cannot be applied universally because wastage and shrinkage depend on many variables.

Factor Effect
Yarn type Cotton, wool, silk, and synthetic yarns behave differently
Yarn twist High-twist yarn may contract differently
Fabric structure Plain, twill, satin, dobby, and jacquard structures consume yarn differently
Picks per inch Higher picks may increase crimp and take-up
Loom type Handloom, powerloom, rapier, air-jet, and shuttle looms differ
Width in reed vs finished width Fabric may contract after weaving
Finishing process Washing, dyeing, calendaring, mercerising, and sanforising affect dimensions
Selvedge construction Extra yarn may be consumed at the edges

The best practical method is:

First calculate the theoretical yarn requirement, then add an allowance based on experience with that yarn, loom, fabric structure, and finishing route.

15. Difference Between Warp and Weft Calculation

For warp, the usual calculation is:

\[ \text{Total warp length} = \text{Number of ends} \times \text{Length of warp} \]

This is because warp threads run lengthwise.

But for weft, the yarn runs across the width of the cloth. Therefore, we calculate:

\[ \text{Total weft length} = \text{Width} \times \text{Picks per inch} \times \text{Length} \]

Warp Calculation Weft Calculation
Based on total number of ends Based on picks per inch
Threads run along fabric length Threads run across fabric width
Length of each warp end is known Length of each pick equals cloth width
Formula uses ends × length Formula uses width × picks × length

16. Practical Use in Weaving and Merchandising

This calculation is useful for:

  • estimating weft yarn consumption,
  • costing fabric,
  • planning yarn purchase,
  • using up leftover yarn lots,
  • deciding how many metres or yards can be woven from available yarn,
  • checking whether a given yarn stock is enough for production,
  • comparing fabric constructions,
  • estimating fabric weight,
  • planning small batch weaving.

17. Rearranged Formulae

The main formula is:

\[ \text{Weight} = \frac{I \times P \times Y}{N \times C} \]

From this, the formula can be rearranged depending on what needs to be found.

A. To Find Picks per Inch

\[ P = \frac{\text{Weight} \times N \times C}{I \times Y} \]

Use this when the available yarn weight, yarn count, cloth width, and cloth length are known, and the required picks per inch are to be found.

B. To Find Cloth Length

\[ Y = \frac{\text{Weight} \times N \times C}{I \times P} \]

Use this when the available yarn weight, yarn count, cloth width, and picks per inch are known, and the possible cloth length is to be found.

C. To Find Cloth Width

\[ I = \frac{\text{Weight} \times N \times C}{P \times Y} \]

Use this when the available yarn weight, yarn count, picks per inch, and required length are known, and the possible cloth width is to be found.

D. To Find Yarn Count

\[ C = \frac{I \times P \times Y}{N \times \text{Weight}} \]

Use this when the target yarn weight, width, picks per inch, and cloth length are known, and the required yarn count is to be found.

18. Practical Example: How Much Cloth Can Be Woven from Available Yarn?

Suppose:

Item Value
Available cotton yarn 6 lb
Count 20s cotton
Width 30 inches
Picks per inch 60
Cotton hank length 840 yards

Formula:

\[ Y = \frac{\text{Weight} \times N \times C}{I \times P} \]

Substituting the values:

\[ Y = \frac{6 \times 840 \times 20}{30 \times 60} \]

\[ Y = \frac{100{,}800}{1800} \]

\[ Y = 56 \]

Therefore:

6 lb of 20s cotton yarn can theoretically weave 56 yards of cloth.

If a 5% allowance for waste and shrinkage is added, the practical cloth length will be slightly lower:

\[ 56 \div 1.05 = 53.33 \]

So practically, the weaver may expect about:

53 yards of cloth

19. Essence of the Calculation

To calculate the weft yarn required in a fabric, multiply:

\[ \text{Width} \times \text{Picks per inch} \times \text{Length} \]

This gives the total length of weft yarn. Then convert it into hanks using the hank length for that yarn system. Finally, divide by count to get weight.

Key Formula

\[ \boxed{ \text{Weight} = \frac{ \text{Width in inches} \times \text{Picks per inch} \times \text{Length in yards} }{ \text{Yards per hank} \times \text{Count} } } \]

Practical Note

\[ \boxed{ \text{Actual yarn required} = \text{Theoretical yarn required} + \text{Allowance for waste, shrinkage, and take-up} } \]

In weaving practice, the theoretical calculation should always be adjusted based on experience with the yarn, loom, fabric construction, and finishing process.

Conclusion



This rule is a simple but powerful textile calculation. It connects the geometry of woven cloth with yarn count systems and practical production planning. By knowing the width of the fabric, picks per inch, cloth length, yarn count, and hank length, a weaver or fabric planner can estimate the weft yarn required for production.

However, the calculation should not be treated as the final practical requirement. It gives the theoretical consumption. In actual weaving, shrinkage, crimp, take-up, loom waste, selvedge loss, and finishing effects must also be considered.

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Saturday, 25 July 2009

How to Buy Fabric for the Garments



An excellent guide on how to buy fabrics for the garments is given here. All the essential questions regarding what, why, where, how and who of fabric buying are explained in this guide.

Tuesday, 21 July 2009

Terry Towel Calculations-1



Terry Towel Calculations – 1

Calculating the Weight of Ground Warp in a Terry Towel

A terry towel is different from an ordinary woven fabric because it has a looped surface. These loops are responsible for the towel’s softness, bulk, absorbency and characteristic hand feel. Unlike a simple plain woven cloth, a terry towel normally uses two warp systems and one weft system. These are the ground warp, pile warp and weft.

The ground warp forms the foundation of the towel. It gives strength and stability to the fabric. The pile warp forms the loops on the surface. The weft binds the warp systems together and helps create the final towel structure. In this article, we shall calculate only the weight of the ground warp used in one towel. The pile warp and weft calculations can be taken separately.

Table of Contents

  1. Understanding the Terry Towel Structure
  2. Given Data
  3. Understanding Tex
  4. Why Ground Warp Is Calculated in Two Parts
  5. Formula for Ground Warp in Grey Fabric
  6. Calculation of Ground Warp in Grey Fabric
  7. Why Warp Crimp Is Important
  8. Formula for Ground Warp in Fringe
  9. Calculation of Ground Warp in Fringe
  10. Total Ground Warp Weight
  11. Why the Ground Warp Weight May Look Small
  12. Practical Notes for Textile Calculations
  13. Key Learning
  14. Related Reading
  15. Sources
  16. General Disclaimer

1. Understanding the Terry Towel Structure

In a terry towel, the pile loops are not accidental. They are deliberately formed by controlling the movement and tension of the pile warp during weaving. The pile warp is usually kept under lower tension than the ground warp, so that it can be pulled forward and formed into loops. The ground warp remains more tightly controlled and works as the structural base of the towel.

This is why terry towel weight calculation is not done exactly like a simple flat fabric calculation. We have to treat each yarn system according to its function in the fabric. The ground warp, pile warp and weft do not consume yarn in the same way. Their yarn counts, lengths, crimp values and structural roles may be different.

Terry towel structure showing ground warp pile warp and weft
Visual 1: Basic terry towel structure showing ground warp, pile warp and weft.

2. Given Data

Let us assume the following construction details for the towel. These values are used to explain the method of calculation. In practical mill work, the values should be taken from actual fabric construction, loom settings, yarn count records and production data.

Parameter Value
Length of grey towel 106 cm
Number of ground warp ends 694
Ground warp count \(25 \text{ tex} \times 2\)
Warp crimp 8%
Warp crimp factor 1.08
Fringe length 2 cm

The ground warp count is given as \(25 \text{ tex} \times 2\). This means that the yarn is a two-ply yarn. Each ply is 25 tex, so the effective yarn count for calculation is:

\[ 25 \times 2 = 50 \text{ tex} \]

3. Understanding Tex

Tex is a direct yarn count system. It tells us how many grams are present in 1000 metres of yarn. In direct count systems, a higher tex value means a heavier or coarser yarn, while a lower tex value means a finer yarn.

\[ \text{Tex} = \frac{\text{Weight in grams}}{1000 \text{ metres}} \]

So, if a yarn is 50 tex, it means that 1000 metres of that yarn weighs 50 grams. This makes tex very useful for calculating yarn weight when the length of yarn is known.

Practical point: Whenever tex is used, the length must ultimately be converted into metres. Since towel dimensions are often written in centimetres, the centimetre-to-metre conversion must be handled carefully.

4. Why Ground Warp Is Calculated in Two Parts

The ground warp is present in two places. It is present in the main grey fabric body of the towel, and it is also present in the fringe portion. These two portions are treated separately because the yarn behaviour is different in both areas.

In the grey fabric body, the ground warp interlaces with the weft. Because of this interlacement, the yarn does not remain perfectly straight. It follows a slightly wavy path. This extra length is called warp crimp or warp take-up.

In the fringe portion, the yarn is generally considered to be straight and loose. Therefore, warp crimp is usually not added to the fringe calculation in a basic estimate.

\[ \text{Total ground warp weight} = \text{Ground warp in grey fabric} + \text{Ground warp in fringe} \]

5. Formula for Ground Warp in Grey Fabric

The formula for calculating the ground warp weight in the grey fabric body is:

\[ \text{Ground warp weight in grey fabric} = \frac{ \text{Grey length} \times \text{Warp crimp factor} \times \text{Number of ground ends} \times \text{Yarn tex} }{ 100 \times 1000 } \]

The denominator \(100 \times 1000\) is used for unit conversion. The fabric length is given in centimetres, while tex is based on metres. Since \(100 \text{ cm} = 1 \text{ metre}\), and tex is based on \(1000 \text{ metres}\), the conversion factor becomes:

\[ 100 \times 1000 = 100000 \]

Ground warp calculation flow showing length crimp ends tex and unit conversion
Visual 2: Ground warp calculation flow from construction data to yarn weight.

6. Calculation of Ground Warp in Grey Fabric

Substituting the values:

\[ \text{Ground warp weight} = \frac{ 106 \times 1.08 \times 694 \times 25 \times 2 }{ 100 \times 1000 } \]

Since \(25 \times 2 = 50\), we can write:

\[ \text{Ground warp weight} = \frac{ 106 \times 1.08 \times 694 \times 50 }{ 100000 } \]

\[ = 39.72 \text{ grams approximately} \]

Therefore:

\[ \boxed{\text{Weight of ground warp in grey fabric} = 39.72 \text{ g}} \]

7. Why Warp Crimp Is Important

Warp crimp is the extra yarn length required because of interlacement. In a woven fabric, warp yarns pass over and under the weft yarns. This makes their actual path longer than the straight fabric length. Therefore, if we calculate warp consumption only from the straight fabric length, we may underestimate the yarn actually required.

If the fabric length is 100 cm and the warp crimp is 8%, the actual yarn length consumed is:

\[ 100 \times 1.08 = 108 \text{ cm} \]

So an 8% crimp means that for every 100 cm of fabric length, 108 cm of warp yarn is required. In this example, a crimp factor of 1.08 has been used:

\[ 1 + \frac{8}{100} = 1.08 \]

In actual production, warp crimp may vary depending on yarn tension, weave structure, reed setting, picks per cm, finishing shrinkage and loom conditions. Therefore, crimp should ideally be taken from mill records or measured from actual fabric samples.

8. Formula for Ground Warp in Fringe

The fringe length is calculated separately. The formula is:

\[ \text{Ground warp weight in fringe} = \frac{ \text{Fringe length} \times \text{Number of ground ends} \times \text{Yarn tex} }{ 100 \times 1000 } \]

In this basic calculation, crimp is not added to the fringe because the fringe yarn is not interlaced like the main fabric body. However, for a detailed production costing, fringe trimming, knotting, twisting and wastage may also have to be considered.

9. Calculation of Ground Warp in Fringe

Substituting the values:

\[ \text{Ground warp weight in fringe} = \frac{ 2 \times 694 \times 25 \times 2 }{ 100 \times 1000 } \]

Since \(25 \times 2 = 50\):

\[ \text{Ground warp weight in fringe} = \frac{ 2 \times 694 \times 50 }{ 100000 } \]

\[ = 0.69 \text{ grams approximately} \]

Therefore:

\[ \boxed{\text{Weight of ground warp in fringe} = 0.69 \text{ g}} \]

10. Total Ground Warp Weight

Now we add both parts:

\[ \text{Total ground warp weight} = \text{Ground warp in grey fabric} + \text{Ground warp in fringe} \]

\[ = 39.72 + 0.69 \]

\[ = 40.41 \text{ grams approximately} \]

Therefore:

\[ \boxed{\text{Total ground warp weight} = 40.41 \text{ g}} \]

11. Why the Ground Warp Weight May Look Small

At first glance, the ground warp weight may appear small. However, this is understandable in terry towel construction. A terry towel is not a flat fabric where the ground warp, weft and total fabric weight are closely balanced. In a terry towel, the pile warp contributes a major share of the final weight because the pile warp forms the loops.

The ground warp is mainly a foundation system. Its purpose is to hold the fabric together and provide dimensional stability. It is not expected to contribute the largest portion of the towel weight. The pile warp, because of its loop formation and pile ratio, normally consumes much more yarn than the ground warp.

Comparison of yarn weight contribution in terry towel ground warp pile warp and weft
Visual 3: Conceptual comparison of ground warp, pile warp and weft contribution in a terry towel.

12. Practical Notes for Textile Calculations

This calculation is a basic yarn consumption estimate. It is useful for understanding how ground warp weight is calculated, but actual mill calculations may require additional allowances. In production, theoretical yarn consumption and practical yarn requirement are not always the same.

Factor Why it matters
Actual warp crimp Changes the real yarn length consumed in the fabric body.
Loom waste Extra yarn is required during weaving, tying, starting and ending.
Beam gaiting waste Warp preparation and loom setting may consume additional yarn.
Fringe trimming The final towel may lose some yarn during trimming or finishing.
Sizing material Sizing may increase grey fabric weight before desizing or washing.
Moisture regain Measured yarn and fabric weight may vary with atmospheric moisture.
Yarn count variation Actual yarn may differ slightly from the nominal tex value.
Finishing shrinkage Final dimensions and GSM may change after washing and finishing.

Therefore, for production costing, this theoretical value should be adjusted using mill experience and actual fabric measurements. The formula gives the logic, but the mill data gives the practical correction.

13. Key Learning

The ground warp weight of a terry towel depends on four main things: the length of the towel, the number of ground warp ends, the yarn count in tex and the warp crimp or take-up. The basic logic is simple:

\[ \text{Yarn weight} = \frac{ \text{Yarn length} \times \text{Number of yarns} \times \text{Tex} }{ 100 \times 1000 } \]

The most important point is to handle the units carefully. Since tex is based on grams per 1000 metres and towel length is often given in centimetres, the conversion factor must be applied properly. A calculation may look simple, but a small unit error can produce a very large difference in yarn consumption and costing.

For a textile student, merchandiser or production planner, this calculation gives a useful foundation for understanding towel costing and yarn consumption. The ground warp is only one part of the towel. To calculate the complete towel weight, one must also calculate the pile warp and weft weights separately.

\[ \text{Total towel weight} = \text{Ground warp weight} + \text{Pile warp weight} + \text{Weft weight} \]

In the next part, we can calculate the pile warp weight, which is usually the most important contributor to the weight, feel, absorbency and bulk of a terry towel.

Sources

  1. Hutex. Terry Towel: Terry Weaving. Available at: https://hutex.co.kr/wp-content/uploads/2023/06/Terry_Towel.pdf
  2. ScienceDirect Topics. Pile Warp - An Overview. Available at: https://www.sciencedirect.com/topics/engineering/pile-warp
  3. Textile School. Terry Towels: Fabrics That Can Absorb Large Amounts of Water. Available at: https://www.textileschool.com/3211/terry-towels-fabrics-that-can-absorb-large-amounts-of-water/
  4. Resil Chemicals. Technical Tuesday: Terry Towel. Available at: https://resiltextiles.com/wp-content/uploads/simple-file-list/Technical-Tuesday/2014/TT-Terry-Towel.pdf
  5. ResearchGate. An Investigation into the Parameters of Terry Fabrics Regarding the Production. Available at: https://www.researchgate.net/publication/293131432_An_investigation_into_the_parameters_of_terry_fabrics_regarding_the_production

General Disclaimer

This article is intended for educational understanding of terry towel yarn consumption calculations. The numerical values used here are illustrative and should not be treated as universal production standards. Actual mill calculations may vary depending on yarn count variation, loom settings, pile ratio, warp and weft crimp, sizing, wastage, finishing shrinkage, moisture regain and the specific construction of the towel.

For commercial costing, production planning or quality control, the calculation should be verified with actual fabric samples, mill records and approved technical specifications.

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