System and method for determining bending performance for technical yarns

Abstract

The invention can be used in the textile sector to determine the bending performance of yarns, especially technical yarns (sewing thread, cabled yarns, coated yarns, etc.).

Description

[0001] SYSTEM AND METHOD FOR DETERMINING BENDING PERFORMANCE FOR TECHNICAL YARNS

[0002] Technical field of the invention

[0003] The invention can be used in the textile sector to determine the bending performance of yarns, especially technical yarns (sewing thread, cabled yarns, coated yarns, etc.).

[0004] The invention evaluates the bending behaviour of technical yarns, provides repeatable results, and accurately reveals the difference between types in terms of the examined property.

[0005] The State of the Art

[0006] For many years, the method based on the deformation problem of a circular ring by Peirce (1930) has been used to evaluate the bending performance of yarns. In this method, first of all, a regular ring with a diameter of 1 cm is formed by tying a knot with the yarn, the bending performance of which will be determined. The ring, which should be prepared as a very regular circle, is then deformed with a certain weight, and then the bending performance is determined with more than one process step using the displacement information.

[0007] There are four technical problems with the method of determining bending performance by making a ring used before the invention:

[0008] 1 ) The sample preparation phase is difficult and time-consuming

[0009] 2) The ring-loop method is not suitable for every yarn type, especially technical yarns, and it is difficult to form a smooth and fully circular ring (the rings formed are in different shapes, such as ellipses and drops instead of full circles).

[0010] 3) Opening problems of knots in thick, coated, and special surface-finished yarns

[0011] 4) Knots create extra weight in thick yarns. In the method used before the invention, making a very smooth, completely circular ring that does not twist and bend on itself is required by tying a knot for yarn bending performance.

[0012] The invention, which is the subject of the application numbered “CN115931485A” in the state of the art, belongs to the textile field and relates particularly to a method for preparing a bending performance sample of high-performance yarn. This method describes the preparation of the sample for the bending performance of high- performance yarn with a pressure roller mechanism, a flat pressing mechanism, and a sample clamping device. The current method covers the sample preparation but does not cover the bending measurement process.

[0013] Making a smooth and completely circular ring by tying a knot on yarn is both timeconsuming and involves practical difficulties. A completely circular yarn ring cannot be made due to situations such as the slippery surface of the yarn, the thickness of the yarn, and the excessive twist of the yarn, or a completely circular ring is obtained with many attempts, especially in thick yarns, the form of the yarn ring can be distorted by tying more than one knot in order not to open the knot. This situation prevents the correct measurement of bending performance. To reveal the ability of technical yarns to take shape, it is important to determine the bending behaviour of the yarn. However, due to the problems experienced in terms of repeatable measurements and practical difficulties in the ring method, measuring this performance is avoided.

[0014] It is a significant deficiency in the state of the art that the bending performance of technical yarns cannot be determined either in the form of yarn alone or in terms of their use in the fabric structure. For this reason, a system that allows the bending performance to be evaluated without tying a knot and making a ring is needed.

[0015] The aim of the invention

[0016] The invention eliminates the difficulties and problems of making a circular ring to determine the bending property.

[0017] One aim of the invention is to enable the bending performance to be evaluated without tying a knot and making a ring. Thus, a method that is more practical, results in a shorter time, and can yield repeatable results is proposed. Today, there are many types of yarns with different production technologies and different properties. Therefore, the classical ring method used to determine yarn bending behaviour is insufficient in determining the bending behaviour of existing yarn types and new ones added every day.

[0018] Another aim of the invention is to ensure that the bending behaviour of technical yarns that have problems in terms of taking shape is determined with a practical and repeatable method.

[0019] In classical yarns, the deformation of the regular circular ring obtained by tying a knot is determined by applying weight and the bending performance is calculated with a complex series of formulas. Creating a circular ring is difficult, especially in technical yarns. The method comprises difficulties in both its application and calculations and does not give repeatable results for every yarn type.

[0020] Another aim of the invention is to ensure that it does not comprise a difficult sample preparation stage like the ring method. Thus, the difficulties and errors experienced while creating the ring have been eliminated with the invention. The test results can be used to directly evaluate the bending performance of different yarns without extra calculations. Since it is a practical method, it can be easily used both in the textile sector and in academic studies.

[0021] The original aspect of the invention is that the bending behaviour of all types of yarns, especially technical yarns, can be determined accurately and repeatedly with a simple mechanism and a more practical method.

[0022] Another aim of the invention is to enable the determination of bending behaviour without the need to make a yarn ring by tying a knot.

[0023] Another aim of the invention is to provide repeatable measurements by ensuring that the same shape is formed each time.

[0024] Another aim of the invention is that it can be applied to all yarns and filament fibres.

[0025] Description of the Drawings

[0026] Figure 1 is a drawing showing the front view of the invention. Figure 2 is a drawing showing the side view of the invention.

[0027] Figure 3 is the drawing showing the open view of the clamp with felt glued to its inner surface.

[0028] Reference numbers

[0029] 1. Measuring stick with a ruler

[0030] 2. Clamp

[0031] 3. Footplate

[0032] 4. Felt

[0033] Description of the Invention

[0034] In classical yarns, the deformation of the regular circular ring obtained by tying a knot is determined by applying weight and the bending performance is calculated with a complex series of formulas. Preparing a circular yarn ring is difficult, especially in technical yarns. The method comprises difficulties in both its application and calculations and does not provide repeatable results for every type of yarn.

[0035] The invention does not comprise a difficult sample preparation stage like the ring method. Thus, the difficulties and errors experienced while creating the ring have been eliminated with the invention. The test results can be used to directly evaluate the bending performance of different yarns without extra calculations. Since it is a practical method, it can be easily used both in the textile sector and in academic studies.

[0036] This invention comprises a measuring stick with a ruler (1 ) to measure the deformation, a clamp (2) system to shape and deform the yarn, a footplate (3) to hold the measuring stick upright and felt (4) pieces glued to the clamp to prevent the yarn from slipping.

[0037] The yarn to be tested is cut to a fixed length, its two ends are joined and these two ends are placed inside the open clamp (2) mechanism and the clamp (2) is closed. The clamp (2) arms can be opened and closed at 90 degrees. After the yarn ends are placed and the clamp is closed, the yarn piece takes the form of a heart ring. 30 seconds are waited for the yarn to take shape freely. The vertical length of the yarn that takes the shape of a heart ring is measured using the measuring stick with a ruler (1 ). The length of the ring obtained is accepted as a measure of the bending resistance. Accordingly, the lower the ring length obtained as a result of the test, the higher the bending resistance.

[0038] Since this invention provides a practical and repeatable method for determining the bending behaviour of yarns, it can be easily used in the textile sector, especially for evaluating the bending behaviour of technical yarns. The classical ring deformation method is not preferred in the sector due to the difficulty of application and calculation.

[0039] This invention can be practically applied in the textile sector to determine the bending behaviour of all yarn types, especially technical yarns.

[0040] The working method of the system for determining the bending performance of technical yarns comprises the process steps of

[0041] - Cutting the yarn to a fixed length, joining the two ends, and placing them inside the clamp (2),

[0042] - Waiting for the yarn to take shape freely, and

[0043] - Measuring the vertical length of the heart-shaped yarn using a measuring stick with a ruler (1 ).

Claims

CLAIMS1. System for determining the bending performance of technical yarns, comprising:- at least one measuring stick with a ruler (1 ) that allows the vertical length of the heart-shaped yarn formed by the device to be measured,- at least one footplate (3) that allows the measuring stick with a ruler (1 ) to be held perpendicular to the ground,- at least one clamp (2) that can be closed and opened, allowing the two ends of a yarn to be held, and- at least two felts (4) that are located on the inner surface of the clamp (2) arms and prevent the yarn from slipping through the clamp (2).

2. Working method of the system for determining the bending performance of technical yarns, comprising the process steps of:- Cutting the yarn to a fixed length and joining the two ends and placing them inside the clamp (2),- Waiting for the yarn to take shape freely, and- Measuring the vertical length of the heart-shaped yarn using a measuring stick with a ruler (1 ).

3. System for determining the bending performance of technical yarns according to Claim 1 , comprising clamp (2) arms with felt (4) covered inner surface that can be opened 90 degrees to shape the yarn into a heart ring and a measuring stick with a ruler (1 ) that allows measuring the ring length in the vertical direction

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