JPS59112002A - Rubber band - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rubber band suitable for a cuff of clothing to be worn.

Shorts, panties, long pants, trunks, training pants, diaper covers, sanitary panties,
In skin-wearing clothing such as swimsuits, rubber bands are used as mouthpieces in order to prevent wrinkles and increase the tightness against the skin.

Rubber bands used for this purpose are usually 0,2IIln
or 0. By cutting a rubber cord manufactured by knitting several to several tens of rubber threads or polyurethane elastic threads having a diameter of 5 wn in parallel with sewing thread into a predetermined length, and tying both ends or sewing them together with sewing thread. Manufactured.

Rubber bands used as openings for undergarments are enclosed between fabrics, so if the performance is suitable, rubber bands made of rubber string can be replaced with rubber bands made of bare rubber without changing the appearance. Or, it is not only an item (matter) that not only does not cause any practical problems or problems, but also should be improved from the standpoint of resource and labor saving.

Conventionally, rubber bands made of bare rubber are produced by extruding kneaded rubber from an extruder equipped with a round die. It is manufactured by vulcanizing a molded tube and then cutting it into rounds at regular intervals. It would be advantageous if the rubber band obtained by this extrusion method could be used as a cuff for underwear, but this method only yields a thick rubber band with a wall thickness of 0.50 mm or more. Therefore, in order to manufacture a rubber band with the desired repulsive force, the width of the force must be narrowed, but a narrow rubber band has a strong pressure force on the skin, causing rubber marks on the skin or itching. Because it causes discomfort, such as causing discomfort, it is not used as a mouthpiece for skin-wear clothing, and is generally used only in very limited applications, such as #arm covers.

The inventors of the present invention have conducted extensive research on manufacturing rubber bands from flat rubber sheets obtained by calendering, etc., and have conducted various prototype tests. /adf
The wall thickness is 0.15 mI [
It was found that a rubber band manufactured from a rubber sheet having a thickness of 1 to 0.45 mm is suitable for this purpose, and the present invention was completed by working together with the development of a method for manufacturing such a rubber band. .

The rubber band of the present invention has the following excellent features.

(1) When used as a lip rubber for skin-wearing clothing, it prevents abrasion and increases the tightness to the skin, but it does not leave rubber marks on the skin or cause discomfort such as itching. , the feeling of wearing is extremely favorable.

(2) Unlike rubber bands made of rubber cord, sewing thread for braiding is not used, so it is not a waste of resources, but the manufacturing process is also significantly shortened and labor-saving, which reduces manufacturing costs and reduces the need for handicrafts. It also greatly contributes to the mechanization and labor-saving of the underwear garment sewing industry by making mass production possible by replacing industrialized products.

(3) Conventional rubber strings are manufactured using a string-making method in which rubber thread or polyurethane elastic thread is stretched by 10% to 5096% and knitted together using sewing thread. However, since the rubber band made of bare rubber according to the present invention is manufactured without going through the above process, there is no risk of shrinkage due to washing. There is no

The rubber band of the present invention has a tensile stress of 1 at 300% elongation.
It is an essential requirement to have 0 kg/- to sokg/ad.

If the tensile stress at 300% elongation is less than 10 kg/cn1, the underwear worn may become wrinkled or lack a tight feel, which is not preferable. Also, 50kg/aI! If the amount exceeds 100%, the pressure on the skin becomes strong, causing discomfort such as rubber marks and itching. Tensile stress at 300% elongation is 10kg/adfx to 50kg/cn! To obtain this rubber, use natural rubber or synthetic rubber, or a combination of natural rubber and synthetic rubber, and appropriately select the type and amount of compounded chemicals, vulcanization conditions, etc. Above all, carbonated rubber 3 fine powder fillers such as calcium and silicon oxide
It is important to incorporate ~30 PHR.

Further, the rubber band of the present invention has an essential requirement that the wall thickness be 0.150 to 0.45 mm.

In the calender separation method, which is the usual manufacturing method for rubber sheets, it is difficult to manufacture rubber sheets with a wall thickness of less than 15 mm, so it is difficult to manufacture such thin rubber bands from rubber sheets industrially. cannot be manufactured. On the other hand, the thickness of the rubber band is 0.20 mm7 to 0.35 mm [11
1 is optimal, and the thicker it is, the more pressure it feels on the skin, and the more thick it is than 0.45cm, the less practical it is.

The rubber band of the present invention is manufactured from a flat rubber sheet obtained by a calendering method or the like. This type of rubber band is made from vulcanized rubber by cutting an unvulcanized rubber sheet to an appropriate width, wrapping it around a cylindrical body, overlapping the ends of both ears, joining them together, and then vulcanizing them. How to make a tube and cut it into rings: Cut a vulcanized rubber sheet to an appropriate width, glue the ends of both ends together in a ring to make a rubber tube, and cut it into rings. It can be manufactured by any method such as (1) punching out a ring from a vulcanized rubber sheet.

The method (2) is particularly important, and the present inventors have already invented a method and an apparatus for manufacturing a rubber tube by continuously gluing both ends of a vulcanized rubber sheet cut to an appropriate width. , has been filed as Japanese Patent Application No. 172817-1981.
By slicing the rubber tube produced in this manner into rings of a desired width, it is possible to provide an industrially advantageous rubber band made of bare rubber that can be used as a closure for underwear.

As raw rubber, natural rubber, synthetic rubber, or both are used in combination. Weather resistance and dry cleaning resistance can be improved by selecting the raw material rubber.

The width and folding diameter of a rubber band used as a cuff for undergarments are often specified depending on the type of undergarment, the part to which the cuff is attached, and the size. Therefore, the width and fold diameter of the rubber band should be adjusted in cases where the rubber band is too loose and leaves marks on the underwear when used with underwear, or where the rubber band is too strong and leaves rubber marks on the skin. , it is defined to have a tight feel without causing discomfort such as causing itching on the skin.

Next, the present invention will be explained in more detail with reference to Examples.

Example 1 30096 was produced by blending natural rubber and synthetic rubber at a weight ratio of 70730, adding various rubber chemicals, and sulfur vulcanization.The tensile stress during elongation was 20 kg/an!
A belt-shaped rubber sheet with a wall thickness of 0.3 mm and a width of 3
Cut it into 15mm pieces, puff one of the ends on the top and the other on the bottom, then apply naturally vulcanized rubber glue with a brush and pass it through a drying room until the tack (stickiness) of the rubber glue disappears. Dry. The inventors of the present invention previously invented a method in which a dried rubber sheet is continuously run, its ends are scraped together by a rotating brush along a guide, the rubber glue coated parts are overlapped, and then the rubber sheet is passed between pressure rolls. A rubber tube is manufactured by the method and apparatus for manufacturing a rubber tube described in Japanese Patent Application No. 172817/1983, and the tube is cut into rounds with a width of 3111111 mm to have a fold diameter of 15 mm.
A rubber band of 0nnn was obtained.

When this rubber band was used as a locomotive for the leg of a scissor, it felt tight against the skin and was comparable to a conventional rubber band made of rubber cord with both ends sewn by a circular machine. It also has good washing and cleaning resistance, with no shrinkage even after repeated washing and cleaning, and no change in the elasticity of the rubber.

Claims (1)

[Claims] 1. A rubber band manufactured from a rubber sheet, comprising:
Tensile stress at 300% elongation is 101 to 50 kg/
cnf with a wall thickness of 0.15mm to 0.45In
A rubber band characterized by m. 2. The rubber band according to claim 1, wherein the rubber band is an opening rubber for underwear.