JPS5829098B2 - High elongation bandage and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a highly elongated bandage made from a special wet-laid nonwoven fabric and a method for manufacturing the same.

BACKGROUND ART Conventionally, stockinette knitted bandages or bandages woven with rubber have been commercially available as simple elastic bandages, and are used for areas that change in thickness or require bending, such as knees and heels.

However, these require sufficient strength to cut, require tools such as scissors, and are bulky, so their adhesion to the skin is inadequate.

It also has drawbacks such as long processing steps. Non-woven fabrics are also being used as they can be obtained through simpler processing, but
This is simply due to improvements to the surface structure, such as embossing, and does not have good elasticity or adhesion to the skin.

In addition, attempts have been made to use fibers with high latent crimpability and make them stretchable by crimping them through thermal processing, etc., but they have poor dimensional stability and are difficult to process. be.

As a result of intensive research to eliminate such drawbacks, the present invention was unsuccessful.

An object of the present invention is to provide a highly elongated bandage made of a special wet-laid nonwoven fabric and a method for manufacturing the same.

One of the present inventions is that the elongation at break is 200% or more and the fiber length is 10%.
50-90% (by weight) of heat-fusible composite fibers of ~20 mm and 50-10% (by weight) of cellulose fibers of 7-20 mm length
It is a wet-laid non-woven fabric with a dense mesh-like structure consisting of mixed fibers with crepe-like folds in the longitudinal direction (in the present invention, pleats are not only clear folds, but also weaker folds in which the fibers are intermittent). (including those in which the fibers are gathered together and become highly dense), the nonwoven fabric structure is stabilized by heat fusion of heat-fusible composite fibers, and the pleats are made by pressure-thermal bonding. It is a high elongation bandage characterized by

Another aspect of the present invention is that the elongation at break is 200% or more and the fiber length is 1.
A closed mesh in which mixed fibers of 50 to 90% (by weight) of heat-fusible composite fibers of 0 to 20 mrIL and 50 to 10% (by weight) of cellulose fibers of 7 to 20 mrIL length are distributed at a constant density. The patented paper is made by making paper using a net having a 100% polyurethane paper, and while drying and heating the paper at a heat-fusion temperature, pressing and releasing the pressure with a blade-like body substantially perpendicular to the direction of travel are repeated to create pleats and crimping. This is a method of manufacturing a bandage.

The combination of composite components constituting the heat-fusible composite fiber (hereinafter sometimes simply referred to as composite fiber) has a melting point difference of at least 10°C, preferably 20°C or more, and at least one of the components A combination of thermoplastic resins having fiber-forming properties can be used, but as a preferable example, the low melting point component is a combination of polyethylene and the high melting point component is polypropylene, and as another example, the low melting point component is a combination of ethylene and vinyl acetate. A polymer, a saponified product of the copolymer at any degree of saponification, or a mixture of these and polyethylene (hereinafter referred to as EVA)
(sometimes abbreviated as "based polymer"), a combination of polypropylene as a high melting point component is shown.

The composite structure is a parallel type or sheath-core type structure such that the low melting point component occupies at least a part, preferably one-half or more, of the fiber surface.

If the elongation at break of the composite fiber is less than 200%, sufficient elongation of the bandage cannot be obtained.

Such a high elongation can be obtained by not carrying out stretching or by carrying out a slight stretching after spinning and winding.

Furthermore, if the fiber length is shorter than 10 mm, even if the elongation at break is sufficient, the nonwoven fabric obtained by the final papermaking method will not have sufficient elongation and elasticity, and if the fiber length is longer than 20 mm, it will be difficult to disperse the paper uniformly. A nonwoven fabric cannot be obtained.

Cellulose fibers are mixed into the bandage to make it absorbent and give it a good feel.

Regenerated chemical fibers are generally used, and rayon is particularly preferred.

Usually 7 to 20 mm is used.

A suitable mixing ratio for composite fibers is 50 to 90% (by weight).

If the mixing ratio is larger than this, the hygroscopicity will be insufficient, and if it is smaller than this, the elongation of the composite fibers and the effects of heat fusion will not be sufficient, and the elasticity of the bandage will be insufficient.

As the paper-making method, various methods commonly used in the production of synthetic paper, such as round screen, short screen, inclined fourdrinier, and rotoformer, are used.

In order to give the nonwoven fabric after papermaking a fine mesh-like structure, a wire mesh having closed meshes distributed at a constant density is used as the wire mesh for paper making.

As such a wire mesh, for example, one of ordinary paper-making wire meshes is used.
Alternatively, a certain number of adjacent eyes are closed with resin to create closed eyes at appropriate intervals, and usually, closed eyes of 1 to 5 angles are distributed at intervals of 1 to 5 mm.

In order to facilitate paper making, 5 to 20% (by weight) of fibrous polyvinyl alcohol for paper making may be added.

In the thus obtained wet-laid nonwoven fabric, the rope part of the net has a high density and forms the skeleton of the nonwoven fabric, contributing to its strength, and the part surrounded by the ropes improves the air permeability of the nonwoven fabric during the density, and these parts remain as they are. 1 The properties of a bandage.

This wet-laid nonwoven fabric is further provided with crepe-like pleats in its longitudinal direction.

To create pleats, in the drying process after papermaking, the temperature of the normal Yankee dryer is set to the heat-fusion temperature of the composite fiber, and then the drying process is carried out.
It is heated, and at its exit, it is pressed with a blade-like object, for example a doctor knife, approximately perpendicular to the direction of travel to form pleats.

The number of pleats is 1 after pleating (appropriately 3 to 10 per Z771, and the apparent shrinkage of the nonwoven fabric length due to pleating is 10 to 3.
It is 0%.

Due to this treatment, the fibers are relaxed or bent in the pleats, and the fiber density is high, and this state allows thermal fusion between composite fibers directly or with mixed fibers sandwiched between them. This allows it to maintain its shape.

Furthermore, this fusion between the composite fibers stabilizes the structure of the nonwoven fabric as a whole.

The crepe-like pleated nonwoven fabric thus obtained is rolled up without stretching the pleats too much.

Furthermore, the texture can be softened by thermal calendering, and the elasticity can be improved by annealing, and in this case as well, it is desirable to carry out the process without applying tension at S until the crepe-like folds are crimped.

The bandage thus obtained exhibits appropriate stretchability, with an elongation recovery rate of 60% or more from 10% elongation, and high stretchability, with an elongation at break of 100% or more.

Therefore, the bandage has excellent adhesion to the skin, and since the end of the bandage stretches out at the end of wrapping, it is tight, adheres well even at bends, and does not peel.

This elasticity is not affected even when wet because it is made of synthetic fibers whose physical properties are not affected by moisture.

The properties of the bandage of the present invention are such that the shape of the bandage and the overall nonwoven structure can be stabilized by using heat-fusible conjugate fibers with long fiber length as the main fibers of the non-woven fabric and by thermal fusion between the fibers. It is thought that this is due to the fact that the conjugate fiber has a very high elongation.

Furthermore, the bandage of the present invention has excellent air permeability due to its mesh-like sparse and dense structure and point adhesion between fibers due to composite fibers.

When cutting, it can be easily done by hand from any location.

Furthermore, it can be manufactured using only the usual papermaking process, and is easy to process and has high productivity.

Examples will be shown below, and definitions of physical properties, test conditions, etc. in the present invention will be explained.

○ Tensile test for heat-fusible composite fibers According to JISL 1069 (tensile test method for fibers) constant-speed elongation type, strength and elongation at break when grip interval is 5 Qm/m and elongation rate is 200% per minute. .

○ Tensile test and test for bandages (same for non-woven fabrics) Tensile test conditions According to JISL 1079 (chemical fiber fabric test, test method), grab samples of 5CIrL width at intervals of 100 m /
m at an elongation rate of approximately 100% of the spacing of the nails per minute.

Elongation recovery: A yarn length of 100 was stretched by 10% to 110 r in the above tensile test.
n71L, and after holding this state for 3 minutes, loosen the interval between specimen grips to create a tension-free state, and let the total length be l.

Calculated using the following formula. (Unit of l: mm) * Breaking elongation The elongation rate of the bandage at break in the above tensile test.

Example 1 The high melting point component was polypropylene, and the low melting point component was ethylene-vinyl acetate copolymer (vinyl acetate content 7.53 mol%).
) and polyethylene at a mixing ratio of 25 to 5, the fiber length is 15 mm, 1 denier is 4D.
/F1 80% fiber with 280% elongation and 4 D/F
7 m x 7 m paper was mixed with 20% rayon for paper making, and the paper was made using round steel with 1.5 mm squares closed with resin and distributed at 1.5 square intervals to form a network structure, and then dried using a Yankee dryer. Dry at 100℃, heat set, ICrr
5 pieces per L are processed with crepes, rolled up and then cut to a fabric weight of 40J! /m bandage was obtained.

This bandage was subjected to a tensile test.

For comparison, a commercially available product (4) made of cellulose-based nonwoven fabric and a commercially available product (B) made of stockinette knitted cotton yarn were also tested.

The results are shown in Table 1. The bandage of the present invention had a high elongation at break both when dry and wet, and also had elasticity, adhered well to the skin, and was a tight bandage.

Example 2 Heat-fusible conjugate fiber (3D/p x 10 m
/ m, strength 0.6, 9/D, elongation 410%) 60% and 40% rayon of 2D/F The closed eyes of 37rL7It angle are 1
Paper is made into a mesh shape using a rotor former using wire mesh distributed at intervals, and 1c1 is made using a Yankee dryer at 120°C.
7 crepe-like pleats are made per rL, the material is rolled up, and then heated at 110'C (5kg/crtt G).
It was passed through a heat press roll to make the surface smooth and cut into bandages.

The elongation of this product was 320%, showing good elongation.

In addition, the stretchability was also good, with a degree of recovery from stretching of 92% compared to when stretched by 10%.

Comparative Example A heat-fusible composite fiber whose high-melting point component is polypropylene and whose low-melting point component is an ethylene-vinyl acetate copolymer.The fineness is 5 denier, the fiber length is 10 mm, the strength is 3 g/D, and the elongation is 100%. 80% fiber and 20% rayon of 4 D/p x 7 m/m were mixed, paper was made with round steel using the same wire mesh as in Example 1, dried with a Yankee dryer at 100'C, and heat set to create a mesh. I made a non-woven fabric with a structure, but the elongation was 60%.
The degree of recovery after 10% elongation was also as low as 30%, making it unsuitable as a bandage material.

Claims (1)

[Scope of Claims] 1 Heat-fusible composite fibers having a breaking elongation of 200% or more, a fiber length of 10 to 20 mm, 50 to 90% (by weight), and a length of 7 to 20 V
It is a wet-laid nonwoven fabric with a mesh-like, dense structure made of mixed fibers with 50 to 10% (by weight) of cellulose fibers, and has crepe-like folds in the longitudinal direction. A high-stretch bandage whose nonwoven structure is stabilized by fusion bonding and whose folds are pressure-thermobonded. 2 Fiber length 10-20m7IL with breaking elongation of 200% or more
50-90% (weight) of heat-fusible composite fiber and length 7-2
A mixed fiber with 50 to 10% (by weight) of cellulose fibers of 0.5% is made into paper using a mesh having closed meshes distributed at a constant density,
Manufacture of a high elongation Q-shaped bandage characterized by repeatedly press-fitting and removing pressure with a blade-shaped body substantially perpendicular to the direction of travel while drying and heating at a heat fusion temperature to create pleats and press-fit the bandage. Method.