JPS5936673B2 - adhesive tape - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement to the flexible adhesive tape described in British Patent No. 1,256,444.

The tape has a coating of pressure sensitive adhesive held by a woven elastic backing and has a pressure sensitive adhesive coating that yields 100% per square yard when loosened.
~300 grams, and includes elastomeric warp yarns with non-elastomeric weft yarns interspersed with non-elastomeric warp yarns between the warp yarns, which warp yarns are on the adhesive-coated side of the fabric. is floated across a number of weft threads and distributed across the fabric extending between one elastomeric warp thread for every third warp thread and one elastomeric warp thread for every sixth warp thread. Although the adhesive coating forms a non-destructive layer on the fabric, it may have local pores to make the tape breathable. When the tape is loosened, it assumes a non-planar surface consisting of alternating laterally extending ridges and valleys. Adhesive tapes usually come in rolls, and because of the tendency of the adhesive in each turn of the roll to stick to the uncoated surface of the base fabric of the superimposed turn when such tapes are unwound, often encounter difficulties.

The present invention provides that certain variations in the weave pattern of the base fabric of the tape, as well as certain variations in the construction of certain threads used in the weave pattern, provide improved unrollability.
It is based on an improvement of the prior art in that it provides substantially the same properties and performance as described in GB 1256444 with the exception of y).

Accordingly, the present invention comprises an elongated elastic warp thread containing elastomeric filaments raised on one side of a woven substrate across a number of weft threads and interspersed with non-elastomeric textile warp threads; An adhesive tape composed of a pressure-sensitive adhesive coated on one side of a woven base fabric in which the warp contains multifilament nylon yarn, wherein the nylon yarn is 21/2 to 51/2 per monofilament.
denier, and each nylon thread is adjacent to only one cotton warp thread, and the adjacent nylon threads are woven in an opposite weave pattern.

Due to the fact that the elastomeric warp yarns are stretched in the woven fabric, the woven fabric will wrinkle on the surface as it loosens, and transverse wrinkles will occur as the elastomeric warp yarns heal.

The increase in denier per filament of the fibers used in the base nylon warp from 21/2 to 51/2 provides improved unfoldability. Additionally, the use of an overall weave pattern in which each nylon warp thread is woven adjacent to each other in an opposite weave pattern has been found to result in improved developability of the product. The improved spreadability is believed to be due to the reduction of tiny loose filament ends that come into contact with the adhesive on overlapping turns of the tape roll, possibly in some warp yarns. In a preferred embodiment of the invention, each nylon warp is a 70/2, 17 filament yarn (approximately 4 denier per filament), the other non-elastomeric warp is cotton, and the warp is the seventh warp. ? k, distributed across the base fabric in a proportion range of the elastomeric filament warp yarns comprising the elastomeric filament warp yarns or the elastomeric filament warp yarns comprising every 13th warp yarn.

Two embodiments of the base fabric according to the invention are shown in the accompanying drawings:
Figures 1 and 2 show similar weave patterns.

Each figure diagrammatically shows a portion of the base fabric.

In each case, the warp threads are Wl, W2,...
. . , the last warp (Wll in FIG. 1 and Wl4 in FIG. 2) in each weaving pattern is a repetition of W1. Similarly, the weft threads are designated F1 through F9, with F9 being a repeat of F1 for each weave pattern. The base fabric has the first British patent
A pressure sensitive adhesive coating (not shown) applied as described in US Pat.

Although weft yarn 20 is preferably a natural cotton yarn, many variations are suitable.

The warp yarns are of three distinct types, including elastomeric warp yarn 22 (140 denier Avril core spun yarn available from Stretchern Co., Fall River, Mass.).
spunyam>), 60/2 cotton yarn 24, and 70/2, 17 filament nylon superloft yarn 26.

Elastomeric thread 22 is floated across a number of warp threads. In the fabric shown in FIGS. 1 and 2, the nylon threads 26 are woven in pairs in opposite weave patterns (with the exception of their adjacent elastomeric threads 22) and the cotton threads 24
separated by

This arrangement tightly constrains the nylon to the base fabric so as to reduce loose nylon filament ends proximate to contacting the overlying adhesive when the tape is rolled into a roll. The base fabric of the tape described in GB 1256444 included a 70/2, 34 filament nylon superloft yarn or a 70/4, 34 filament nylon superloft yarn in the warp.

Each of these has a denier per filament of approximately 2.
In the case of the tape according to the invention, the number of filaments in the nylon thread is reduced and the denier per filament is 2
Increased between 1/2 and 51/2. This fabric contains fewer fine nylon filaments, which are more likely to be pulled out from the surface of the fabric due to contact with the adhesive coating overlying the farthest roll of tape. However, further increases in denier make the nylon yarn too coarse to be acceptable for tape manufacture and use, so the practical upper limit of denier per filament is approximately 51/
It is 2. The embodiments of the present invention can be summarized as follows.

(1) The tape according to claim 1, wherein each nylon thread is a 70/2J7 filament thread. (2) The tape according to item (1) above, wherein the non-elastomeric warp yarns of a material other than nylon are cotton yarns. (3) each of the above terms in which the warp yarns are distributed across the fabric in a ratio range of elastomeric filament warp yarns comprising every 7th warp yarn to elastomeric filament warp yarns comprising every 13th warp yarn; The tape described in any one of the above.

[Brief explanation of drawings]

1 and 2 show similar weave patterns of the adhesive tape base fabric according to the present invention.

Claims (1)

[Claims] 1 Raised on one side of the woven base fabric across many weft threads,
and a non-elastomeric woven warp comprising stretched elastic warp yarns containing interspersed elastomeric filaments, the warp yarns comprising multifilament nylon yarns, and a pressure-sensitive adhesive applied to one side of a woven base fabric. In the adhesive tape constructed by the agent, the nylon threads have a denier of 21/2 to 51/2 per filament, and each nylon thread is adjacent to only one cotton warp thread, and each nylon thread is adjacent to only one cotton warp thread, An adhesive tape characterized by nylon threads woven in opposite weaving patterns.