CSP Tester

Determine the Lea C.S.P by Lea CSP Tester and Autosorter and compare the results of various yarn


Cotton yarns are widely used in the textile industry for their softness, durability, and absorbency. Cotton yarns are characterized by their count and strength, which are measured by the Lea count and the Lea C.S.P. (Count Strength Product) respectively. In this lab experiment, we will determine the Lea C.S.P. of various cotton yarn samples using the Lea CSP Tester and Autosorter and compare the results.


The objective of this lab experiment is to determine the Lea C.S.P. of various cotton yarn samples using the Lea CSP Tester and Autosorter and compare the results.

  • Cotton yarn samples
  • Lea CSP Tester and Autosorter
  • Balance
  • Micrometer
  • Stopwatch

  1. Obtain a set of cotton yarn samples to be tested.
  2. Use a micrometer to measure the diameter of each yarn sample at several points along its length and calculate the average diameter.
  3. Record the average diameter of each yarn sample in micrometers.
  4. Weigh each yarn sample using a balance and record the weight in grams.
  5. Load each yarn sample onto the Lea CSP Tester and Autosorter and adjust the tension.
  6. Set the machine to run at a constant speed of 900 yards per minute.
  7. Run each yarn sample through the machine until it breaks.
  8. Record the time taken for each yarn sample to break in seconds.
  9. Calculate the Lea C.S.P. of each yarn sample using the formula:

Lea C.S.P. = (weight of sample in grams / time to break in seconds) x 900 x 2.54 / average diameter in micrometers

  1. Record the Lea C.S.P. of each yarn sample in units of lbs/inch.
  2. Compare the Lea C.S.P. values obtained for each yarn sample and note any differences or deviations.
  3. Calculate the average Lea C.S.P. for each set of yarn samples tested.


Record the diameter, weight, and time to break for each yarn sample tested. Calculate the Lea C.S.P. of each yarn sample and compare the results. Record the average Lea C.S.P. for each set of yarn samples tested.


Discuss the importance of Lea C.S.P. in the textile industry and how it affects the quality and performance of cotton yarns. Analyze the results obtained from the experiment and discuss any trends observed in the Lea C.S.P. values. Compare the Lea C.S.P. values of the various yarn samples tested and evaluate their quality. Discuss the strengths and limitations of the Lea CSP Tester and Autosorter as a tool for measuring Lea C.S.P. and suggest alternative methods for measuring Lea C.S.P. Suggest further experiments that could be conducted to investigate the strength and quality properties of cotton yarns in more detail.

You should also know ?
CSP Testing Machine

CSP Testing Machine, also known as the Count Strength and Percentage (CSP) tester, is a specialized instrument used in the textile industry to measure the count and strength properties of textile fibers or yarns. It plays a crucial role in quality control and ensuring the desired characteristics of textile materials.

Here’s how CSP Testing Machine works and its significance in the textile industry:

  1. Count Measurement: The CSP tester is used to determine the count or fineness of a textile material, which refers to the linear density of the yarn or fiber. It measures the weight per unit length of the sample material, typically expressed in terms of tex or denier. The count measurement helps assess the thickness or diameter of the yarn, allowing manufacturers to ensure consistency and uniformity in their products.
  2. Strength Measurement: The machine also assesses the strength properties of the yarn or fiber. It measures the maximum force required to break the sample material, commonly referred to as breaking strength. This measurement helps evaluate the durability and tensile strength of the textile material, ensuring it meets the desired quality standards.
  3. Percentage Measurement: In addition to count and strength, the CSP tester can determine the percentage of material defects or irregularities present in the sample. This measurement is essential in identifying any flaws, such as thick or thin spots, foreign particles, or uneven distribution of fibers. By quantifying these defects, textile manufacturers can assess the overall quality and suitability of the material for various applications.
  4. Quality Control: CSP testing is a vital part of quality control in the textile industry. By measuring count, strength, and percentage, manufacturers can identify any deviations or inconsistencies in the material’s characteristics. This information allows them to make necessary adjustments in the production process, optimize raw material usage, and ensure that the final products meet the desired specifications.
  5. Product Development: CSP testing is also valuable during the product development stage. It helps textile engineers and researchers evaluate the performance of different yarns or fibers, compare materials from various suppliers, and assess the impact of process modifications on the final product’s properties. This data-driven approach enables manufacturers to make informed decisions and improve the overall quality and performance of their textiles.

Overall, CSP Testing Machines play a significant role in the textile industry by providing accurate measurements of count, strength, and percentage properties of yarns or fibers. This information is crucial for quality control, ensuring consistent production, and meeting customer requirements in terms of fineness, durability, and overall quality of textile materials.

Lea Strength Tester Principle

The Lea Strength Tester is a device used to measure the strength or tensile properties of textile fibers or yarns. It operates based on the principle of applying a controlled force to the sample and measuring the resistance or breaking strength.

The principle behind the Lea Strength Tester involves clamping the ends of the sample material and applying a steadily increasing load until the material breaks. The tester consists of a pair of jaws or grips, which firmly hold the sample in place. One of the jaws is stationary, while the other is movable.

To perform a test, the sample is prepared by cutting it to a specific length and removing any irregularities or defects. The ends of the sample are then securely clamped between the grips. The movable jaw is attached to a mechanism that applies a force to the sample.

As the force is applied, the material undergoes stress until it reaches its breaking point. Throughout the process, the tester measures the force required to break the sample. This force is typically measured using a load cell or a similar device that can accurately measure the applied force.

The Lea Strength Tester can provide various measurements, including breaking strength, elongation at break, and tensile strength. These measurements are essential for assessing the quality and performance characteristics of textile fibers or yarns.

It’s worth noting that the Lea Strength Tester is just one of many devices available for testing the strength of materials. Different industries and applications may use alternative testing methods or equipment, depending on their specific needs and requirements.

How to increase CSP in cotton yarn ?

CSP (Count Strength Product) is a measure of the strength of cotton yarn. It represents the product of the yarn count (in hanks per unit weight) and the strength (in grams) of the yarn. Increasing the CSP of cotton yarn can enhance its overall quality and performance. Here are some general strategies to increase CSP:

  1. Select high-quality cotton fibers: Start with selecting high-grade cotton fibers with longer staple length and uniform characteristics. Longer staple fibers generally produce stronger yarns.
  2. Optimize spinning parameters: Adjust the spinning process parameters such as drafting, twist level, and spinning speed to optimize the yarn strength. It’s important to find the right balance to ensure proper fiber alignment and twist insertion without causing excessive fiber damage.
  3. Control fiber preparation: Pay attention to the fiber preparation processes, such as opening, cleaning, and carding. These processes should be optimized to remove impurities, align fibers, and minimize fiber damage. Proper control of carding parameters, like flat tops and settings, can help improve yarn strength.
  4. Ensure consistent moisture content: Maintain a consistent moisture level throughout the spinning process. Too much or too little moisture can affect the fiber’s physical properties, including strength. Proper humidification and moisture control in the spinning environment are crucial.
  5. Implement proper yarn handling: Handle the yarn carefully during subsequent processes, such as winding, twisting, and warping. Minimize tension variations and mechanical stresses that could weaken the yarn. Proper package formation and tension control are vital to preserving yarn strength.
  6. Apply appropriate yarn lubrication: Lubricants can be applied during the spinning process to reduce friction and fiber damage. The use of suitable lubricants can improve the overall strength of the yarn.
  7. Quality control and testing: Implement rigorous quality control measures to identify and eliminate weak spots in the yarn production process. Regular testing of yarn strength using instruments like the Lea Strength Tester or similar devices can help monitor and improve the CSP.

It’s important to note that specific techniques may vary depending on the spinning system, machinery, and yarn specifications. Experimentation, process optimization, and continuous improvement are essential to achieve the desired increase in CSP for cotton yarn.

Frequently Asked Questions | FAQs

What is the full form of CSP in cotton industry?

In the cotton industry, the term “CSP” stands for “Count Strength Product.”

What is CSP in textiles ?

In textiles, CSP stands for “Cotton Spinning Parameters” or “Cotton Spinning Process.”
CSP refers to a set of parameters or characteristics used to assess the spinning potential and performance of cotton fibers. It is an important measurement in the textile industry, particularly in the spinning process, as it provides an indication of the quality and suitability of cotton fibers for spinning into yarn.
CSP is typically calculated by multiplying the yarn count (denoted as Ne or Nm, which represents the number of hanks or kilometers of yarn per unit weight) by the strength of the yarn. The resulting CSP value represents the product of yarn count and strength and provides an estimate of the spinning efficiency and potential of the cotton fibers.
A higher CSP value indicates that the cotton fibers have a better spinning potential, meaning they are more suitable for producing high-quality and strong yarns. On the other hand, a lower CSP value suggests that the cotton fibers may have limitations in spinning and may result in lower-quality yarns.
CSP is an important parameter considered by textile manufacturers, as it helps in selecting appropriate cotton fibers for specific spinning processes and predicting the potential performance of the yarn. It assists in optimizing the spinning process, achieving desired yarn properties, and ensuring the overall quality and efficiency of the textile production.

What is CSP in yarn ?

In the context of yarn, CSP stands for “Count Strength Product.”
CSP refers to a measurement that combines two important characteristics of yarn: the yarn count and its strength. The count refers to the thickness or fineness of the yarn, typically expressed as the number of hanks or kilometers of yarn per unit weight (e.g., Ne or Nm). The strength of the yarn refers to its ability to withstand tension or stress without breaking.
To calculate the CSP, the yarn count and strength are multiplied together. The resulting value represents the product of the count and the strength of the yarn.
CSP is a significant parameter used in the textile industry to assess and compare the performance and quality of different yarns. A higher CSP value indicates that the yarn is finer (lower count) but possesses greater strength. Conversely, a lower CSP value suggests that the yarn is thicker (higher count) but has relatively lower strength.
The CSP value helps determine the efficiency and suitability of yarn for various applications. It is particularly relevant for selecting yarns for specific textile processes and applications that require specific strength-to-thickness ratios. It provides insights into the spinning efficiency, yarn strength, and overall quality of the yarn, aiding manufacturers in producing yarns that meet the desired specifications and performance requirements.

What is unit of yarn strength ?

The unit of yarn strength typically used in the textile industry is grams per tex (g/tex). Tex is a unit of linear density, representing the mass in grams per 1000 meters of yarn.
Yarn strength is measured by determining the force required to break a specific length of yarn. The resulting strength value is expressed in grams. To obtain the yarn strength in g/tex, the measured strength in grams is divided by the linear density of the yarn in tex.
For example, if a yarn has a strength of 300 grams and a linear density of 20 tex, the yarn strength would be calculated as:
Yarn strength = 300 grams / 20 tex = 15 g/tex
The g/tex unit allows for a standardized representation of yarn strength, independent of the linear density or thickness of the yarn. It enables comparisons between yarns of different counts and facilitates the assessment of yarn performance and suitability for various applications.

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