JPH04295355A - Expansible bandage - Google Patents

Abstract

PURPOSE:To provide an expansible bandage which is manufactured using core spun yarn having the core yarn of elastic fiber filament as warp and the sheath yarn of cellulose fiber staple and which can be readily cut in its cross direction by hand without using any instrument such as scissors and whose core yarn and sheath yarn can be cut simultaneously leaving a well-cut section. CONSTITUTION:Core spun yarn for use as warp is manufactured using core yarn of 70 to 140 denier and sheath yarn of Bradford system yarn count 20 to 50 and has its twist coefficient set within the range of 5.5 to 6.0. The density of the warp is set within the range of 18 to 25 pieces per cm and the density of the weft is set at more than 20 pieces per cm and the density of the warp is made smaller than that of the weft.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] This invention relates to an elastic bandage having a high elongation of 80% or more in the warp direction, and when cutting the elastic bandage in the width direction, the elastic bandage can be cut without using tools such as scissors. It can be easily cut by hand.

0002

[Prior Art] As an elastic bandage, a cored spun yarn consisting of a core yarn of an elastic fiber filament having rubber-like elasticity such as spandex and a sheath yarn of a cellulose fiber staple such as cotton or rayon is used for all or part of the warp. Used in some parts,
An elastic bandage is known in which only spun yarns made of the above-mentioned cellulose fiber staples are used for the weft yarns, and the bandage has an elongation of 80% or more in the warp direction under a load of 1.5 kg per 5 cm width.

[0003] The cored spun yarn is produced by feeding the roving of the cellulosic fiber staple to the back roller of a spinning machine, and feeding the elastic fiber filament to the back of the front roller while being drafted 3 to 4 times. It was made by twisting the above-mentioned elastic fiber filaments and cellulose-based fiber staples, which were stacked on the drafted rovings and sent out from a front roller, with a twist coefficient of 4.0 to 4.5.

0004

[Problem to be solved by the invention] The above elastic bandage is
By lowering the strength of the sheath threads and appropriately setting the thickness and density of the warp and weft threads, it is possible to make them easier to tear in the width direction and cut without using tools such as scissors. The elastic bandage was manufactured with a cored spun yarn used for the warp yarns having a twist coefficient of 4.0 to 4.5, and the tightening force of the sheath yarn against the core yarn was relatively weak. When the sheath yarn reaches its breaking elongation during cutting, the core yarn slips and the cutting of the core yarn is delayed.As a result, the core yarn is pulled out from the sheath yarn and is cut, leaving a whisker-like shape in the cut trace. There was a problem that the warp threads would protrude and become uneven.

[0005] The present invention provides an elastic bandage that is easy to cut by hand, and when the sheath threads of the spun yarns with a warp core are cut, the core threads are cut at the same time without coming off, and the core threads form a whisker-like shape. To provide an elastic bandage that leaves clean cut marks without leaving any marks on the skin.

[0006]

[Means for Solving the Problems] The elastic bandage of the present invention has a core consisting of a core yarn of elastic fiber filament having rubber-like elasticity such as spandex and a sheath yarn of cellulose fiber staple such as cotton or rayon. In an elastic bandage in which spun yarn is used for at least a portion of the warp yarns and the elongation in the warp direction under a load of 1.5 kg per 5 cm width is 80% or more, the cored spun yarn has a core of 70 to 140 deniers. Twist the thread and sheath thread of 20 to 50 English style count with a twist coefficient of 5.5
Composite with ~6.0 and warp density of 18-25 threads/c
m, the weft yarn density is 20 yarns/cm or more, and the warp yarn density is smaller than the weft yarn density.

[0007] The core yarn used in the above-mentioned cored spun yarn preferably has an elongation of 400 to 550%. Further, the draft added to the core yarn when producing the cored spun yarn is preferably 3.0 to 4.0 times as in the conventional case. This cored spun yarn does not necessarily need to be used for all of the warp yarns, but it is sufficient to use it for at least a portion of the warp yarns, for example, alternately with one to several non-stretchable normal warp yarns. The above-mentioned normal warp and weft are preferably spun yarns made of cellulose fiber staples such as cotton and rayon, and the normal warp has a thickness of 20 to 50 English count, and the weft has a thickness of 20 to 50 English type count is preferable. Note that the elastic bandage described above can be used by applying a latex adhesive to one side thereof.

[0008]

[Action] Since the twist coefficient of the cored spun yarn used for the warp is 5.5 to 6.0, which is larger than the normal twist coefficient range, the binding force between the core yarn and sheath yarn is strengthened, and the core The sheath thread becomes difficult to slip against the thread. Therefore, when an elastic bandage is wrapped near its stretch limit and cut by hand in the width direction, the core thread and sheath thread are cut almost simultaneously, eliminating the delay in cutting the core thread as in the past, and leaving no trace of cut. The number of core threads that remain in the form of whiskers is greatly reduced.

[0009] However, if the twist coefficient of the cored spun yarn is 5.5
If it is less than 6.0, the desired effect cannot be obtained, and on the other hand, if it exceeds 6.0, snarls will occur during warping and the surface of the fabric will become uneven. Furthermore, if the fineness of the core yarn is less than 70 denier, the stretchability will be reduced and the adhesion will be poor, while if it exceeds 140 denier, the simultaneous cutting ability with the sheath yarn will be poor. Furthermore, if the fineness of the sheath yarn is less than 20 English size, it will be difficult to cut by hand, and if it exceeds 50 English size, it will be difficult to cut simultaneously with the core yarn.

[0010] Also, the warp density of the elastic bandage is 18 threads/cm.
If the value is less than
If the number exceeds 5 pieces/cm, manual cutting becomes difficult. Furthermore, if the weft density is less than 20 threads/cm, misalignment will occur during finishing. Although increasing the weft density does not affect cuttability, it is not preferable that it exceeds 30 wefts/cm because weaving properties deteriorate. When the warp density is greater than the weft density, simultaneous cutting performance is reduced.

[0011]

[Example] Cotton fiber roving is supplied to the back roller of a spinning machine and drafted 23.5 times.
A 40-denier spandex fiber filament was supplied while being drafted 4 times and overlapped with the drafted cotton fiber roving, and the spandex fiber filament and cotton fiber roving that came out of the front roller were twisted with a twist coefficient of 5.5. A 20 count cored spun yarn consisting of a 140 denier core yarn and a 23 English count sheath yarn was produced.

[0012] The cored spun yarn and the 40 count cotton yarn are alternately arranged at a ratio of 1/2 as the warp, and the 16 count cotton yarn is used as the weft, so that the warp density is 20 threads/cm and the weft density is 26 threads. /cm plain weave structure, then subjected to relaxation treatment and finish setting, and then coated with a latex adhesive (solid content 10g/m2) on one side.
The elastic bandage of Example 1 was obtained by cutting into a width of 5 cm.

[0013] Also, cotton fiber roving was supplied to the back roller of the spinning machine and drafted in the same manner as in Example 1, and 40 denier spandex fiber filament was supplied to the back of the front roller while being drafted 3.5 times. The spandex fiber filaments and cotton fiber rovings that came out of the front roller were twisted with a twist coefficient of 6.0 to form a core yarn of 40 denier and a sheath of 57.2 English count. A 50 count cored spun yarn consisting of yarn was produced.

The cored spun yarn and the 50 count cotton yarn are alternately arranged at a ratio of 1/2 as the warp, and the 20 count cotton yarn is used as the weft, so that the warp density is 14 threads/cm and the weft density is 20 threads. /cm plain weave structure, then subjected to relaxation treatment and finish setting, and then coated with a latex adhesive (solid content 10g/m2) on one side.
The elastic bandage of Example 2 was obtained by cutting to a width of 5 cm.

An elastic bandage of Comparative Example 1 was obtained in the same manner as in Example 1 except that the twist coefficient of the cored spun yarn was changed to 4.5. Furthermore, an elastic bandage of Comparative Example 2 was obtained in the same manner as in Example 2 except that the twist coefficient of the cored spun yarn was set to 4.5.

A total of four types of elastic bandages in Examples 1 and 2 and Comparative Examples 1 and 2 were manually cut by 10 experimenters, and the cut marks were visually compared. In Comparative Examples 1 and 2, most of the core yarn of the cored spun yarn remained in the form of whiskers, whereas in Example 1,
In both cases, the cutting marks were significantly improved. That is, in Example 1, compared to Comparative Example 1, there were 2 samples in which the protruding number or protruding length of the core yarn was reduced and an improvement in cut marks was observed, and 8 samples in which a clear improvement was observed. There were no cases where improvement was not recognized. In addition, in Example 2, as in Example 1, there were 2 items in which an improvement in cut marks was observed compared to Comparative Example 2, and 8 items in which a clear improvement was observed. There was nothing that could not be done.

[0017]

[Effects of the Invention] As described above, in this invention, the twist coefficient of the cored spun yarn used for the warp is set to 5.5 to 6.0, which is larger than the conventional 4.0 to 4.5. from,
The bond between the core yarn and sheath yarn that make up the above-mentioned cored spun yarn becomes strong, making it difficult for the core yarn to slip out from the sheath yarn. are cut almost at the same time, which greatly reduces the number of core threads that protrude like whiskers on the cut marks, resulting in clean cut marks. Therefore, there is no need to use tools such as scissors when cutting.
Manual cutting is possible. Furthermore, the twist coefficient can be easily set on a spinning machine that produces cored spun yarn.

Claims (1)

[Claims] 1. A cored spun yarn consisting of a core yarn of an elastic fiber filament having rubber-like elasticity such as spandex and a sheath yarn of a cellulose fiber staple such as cotton or rayon is used for at least a portion of the warp yarn, 1.5 per 5cm width
In an elastic bandage whose elongation in the warp direction under a load of 80% or more, the core spun yarn is 70 to 14
It is made of a composite of 0 denier core thread and 20-50 English count sheath thread with a twist coefficient of 5.5-6.0, and the warp density is 18-6.0.
25 yarns/cm, weft yarn density is 20 yarns/cm or more, and warp yarn density is smaller than weft yarn density.