JPS6175840A - Base cloth for pressure-sensitive tape - 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 <Industrial Application Field> The present invention relates to a base fabric for adhesive tapes, and its purpose is to use warp yarns made of 41 intertwined yarns that have not been widely used in this field; To provide a base fabric for an adhesive tape that is easy to tear by using a weft yarn with a large single yarn fineness, is easy to tear, and has a beautiful cut end with little tape twisting.

<Prior art> In recent years, adhesive tapes have been widely used as packaging materials.
One of the required properties of the tape is that the elongation in the warp direction is 10
It needs to be ~15%; if it exceeds 15%, the elongation will be too high and it will be difficult to tear, and if it is forcibly torn, the cut end will become dirty.

Conventionally, base fabrics for adhesive tapes have been proposed in which the warp and weft yarns are made of rayon yarn or vinylon fibers. Both of them satisfy the above-mentioned elongation characteristics.

However, with the former (spun yarn), the strength when wet is reduced to 45-55% compared to when dry, the base fabric has uneven thickness, the surface is not flat, and the adhesive resin has an excessively large adhesion opening. There are disadvantages such as being prone to
The latter has drawbacks such as being expensive due to the material used, the manufacturing process being complicated, and the strength of 1iii121 being reduced to 70 to 80%.

In order to solve these problems, [1] untwisted multifilament yarn with a denier of 40 denier or less is used as the warp, a low-shrinkage untwisted multifilament yarn with a denier of 3 times or more than the warp is used as the weft, and the weft density is 7 / An adhesive tape base fabric made of a polyester fabric having a thickness of cm or more. ” (Unexamined Japanese Patent Publication No. 50-71570)
, has been proposed. By setting the denier of the warp to 40 denier or less, the warp strength of the adhesive tape can be suppressed to a level that can be cut, and by using non-twisted yarn, the warp can be easily cut one after another.As for the weft, By using the low-shrinkage untwisted multifilament, the dimensional change of the adhesive tape that occurs when the solvent is dried and removed after applying the adhesive at 4 ft 1 L/L is prevented.However, in the above invention, C also The base fabric may have uneven thickness, the surface may not be flat,
It still has some disadvantages, such as the unavoidable contact spots of the adhesive.

Further, as a prior art similar to the above prior art, ``The thickness of the threads constituting the woven fabric is less than 0.3 mm in warp.

□ Adhesive tape base material with weft of 0.3 mrn or more. ” (Japanese Unexamined Patent Publication No. 58067/1983). According to the examples, by reducing the thickness of the warp threads, the strength in the warp direction is sufficiently reduced to the extent that it can be torn, but the elongation in the warp direction is 49 to 6.
2%, and adhesive tapes with such elongation are difficult to cut, fraying occurs at the cut end after tearing, and the cut end cannot be beautiful.

Furthermore, in the prior art, sizing is generally performed regardless of whether untwisted yarn or twisted yarn is used. Therefore, if the fabric is subjected to a scouring process after weaving, it will cause misalignment of the fabric, so the scouring process is usually omitted and resin processing is performed immediately after weaving! However, as a result, the peel strength between the resin and the base fabric decreases due to the influence of the residual adhesive. Particularly in wet conditions, the peeling strength decreases significantly. If the peeling strength between the resin and the base fabric decreases, the adhesive tape becomes less easy to cut by hand and the cut edges become complicated and ugly.

<Object of the Invention> In view of the problems of the prior art, the present inventor has conducted a thorough investigation8.
As a result, by using a specific interlaced yarn as the warp and a yarn with a large single yarn fineness as the weft, weaving at a warp weaving density in a low range and with virtually no twist or gluing, the above-mentioned weaving can be achieved. The inventors have discovered that the following problems can be solved and have arrived at the present invention.

<Structure of the Invention> The present invention is characterized in that the single yarn fineness is 0.1 to 5'F Neal, and the total fineness is 30.
1257? Neil, strength is 2.5 g/denier or more.

The warp is an interlaced yarn with an apparent number density of 20% or less, and the weft is a yarn with a single yarn fineness of 4 to 100 denier, thicker f nier than the warp, and a total fineness of 50 to 250 denier. and warp density IS1'30 to 100 threads/inch.

A base fabric for an adhesive tape, which is woven with a weft density of 25 to 70 lines/inch and substantially without twisting or gluing. ”.

Although the U and strip used for the warp or weft are not particularly limited, it is preferable to use multifilament made of polyamide, polyvinyl alcohol, polyester, or the like.

In particular, polyester multifilament groups are preferable because they are excellent in strength, weather resistance, durability, and the like.

Here, the interlacing process refers to a conventionally known interlacing process such as interlace processing or taslan processing.

The single yarn fineness of the yarn used for the warp is within the range of 0.1 to 5 deniers. If it is less than 0.1 denier, during the entanglement process,
Fuzz is likely to occur. If it exceeds 5 denier, the entangling property will be reduced during the interlacing treatment, and therefore the weaving will not proceed smoothly. Furthermore, tearability as an adhesive tape is reduced. ``The total fineness is in the range of 30 to 125 deniers. When the warp density is less than 30 denynyls and the warp density is 30 to 70 threads/inch, the strength of the woven fabric is too low to be used as a base fabric for adhesive tapes, making it impractical. On the other hand, if it exceeds 125 denier, the tear strength will be too high, which is not preferable. A particularly preferred range is 50 to 80 deniers.

The strength is 2.5 g/denier or more. If it is less than 2.5 g/denier, fuzz will appear during the interlacing process.

Single thread breakage occurs. In the case of the base fabric for adhesive tapes, the strength is more preferably in the range of 3.5 to 5.0 g/denier, although it depends on the elongation. The apparent elongation is 20% or less. 2
If it exceeds 0%, when used as a base fabric for adhesive tape, tear strength increases and hand tearability deteriorates.

Preferably, the product of strength and apparent elongation is 60 to 90 grams7
'There is a range of annealing percentages.

The base/+r of the present invention is woven using the yarns specified above as warp yarns at 100°C, and is woven with virtually no shine.

Weaving of the fukan: The warp I) direction is within the range of 30 to 70 threads/inch. 30 lines/'indices 1c may cause misalignment. If it exceeds 70 lines/inch, the tear strength in the favorable direction will be too high, resulting in poor hand tearability.

Weft binding C has a single yarn fineness of 4 to i o o, ;; Neil C
・And from the shuttle type, use a thinner denier and a total fineness of 50 to 250 denier. , the weft density is 25 to 100 wood/inch.

If the medium yarn fineness is less than 4 deniers, the tape lacks stiffness in the weft direction and is not practical. If it exceeds 30 denier, weavability deteriorates and the tape becomes rough and hard.

If the total fineness is less than 50 denier, the tape will still lack stiffness in the weft direction. If it exceeds 250 denier, the thickness of the tape becomes too large, and the smoothness of the tape surface after being coated with resin decreases due to unevenness that occurs in the base fabric. If the weave density is less than 25 wood/inch, looseness will occur and the cut end will be dirty after tearing. If the number exceeds 100 threads/inch, weaving becomes difficult.

In this way, by increasing the single yarn fineness of the weft yarn, the basic
I has a structure in which the warp bypasses the weft, so the warp does not become loose and weaving performance is improved. In addition, by increasing the single yarn fineness of the weft yarn, tension is created in the weft direction of the base fabric, increasing the stability of the tape and making it difficult for the tape to twist. Furthermore, by increasing the single yarn fineness of the weft yarn, the tape becomes easier to tear in the weft direction.

<Effects of the Invention> As a result of the configuration described in detail above, the present invention has the following effects.

(1) By using yarns with specified physical properties as the warp and weft, weaving within a low mechanical density range and without any twist or glue in a practical manner, it is possible to omit the sizing process without impairing weavability. However, even though it is a low-density fabric, it does not cause blurring. In addition, compared to conventional products, it has a high-performance C-thin base material 11.

(2) Compared to conventional products, when the resin is +30K, the adhesive strength between the resin and the base fabric is reduced because no glue remains on the base fabric, and the same effect is shown even when wet. .

(3) The yarn subjected to the cross-18 treatment has a large number of interlacing points (knot points) +Jψ, resulting in an apparent decrease in elongation.

For example, in the case of an interlacing rate of 50 pieces/m (knee 1 per drop), the apparent elongation decreases by about 5%. A frost tape is made by covering a woven fabric with resin for the warp using threads whose apparent elongation has been reduced by about 5% due to interlacing and processing, resulting in a tear strength of about 50% in the weft and direction. descend. On the other hand, the decrease in tensile strength in the warp direction is only about 10%, which is sufficient for practical use. As a result, the adhesive tape has good manual tearability and a beautiful cut.

(4) Since the weft-entangled yarn is used as the warp and the yarn with high single-filament fineness is used as the weft, the warp does not become loose and the u properties are improved.

(5) Similarly, since the interlacing treatment system is used as the warp and yarn with high single filament fineness is used as the weft, tension is generated in the weft direction of the adhesive tape, increasing the stability of the tape and making it difficult for the tape to twist.

(6) Interlacing treatment: When the yarn is used as the warp and the fineness of the weft is higher than that of the warp, it becomes easier to tear the tape in the weft direction (good tearability) and the cut end becomes beautiful. .

<Example> The present invention will be explained in more detail below with reference to Examples.

Example 1 A polyethylene terephthalate multifilament having a total fineness of 75 deniers and 24 filaments was subjected to Taslan processing under normal conditions. The strength of the multifilament is 3.
5 g/denier, and the apparent elongation was 15%. Using the multifilament for the warp, the total fineness is 150 deni =
10-filament polyethylene terephthalate multifilament (strength: 4.3 g/denier, elongation: 28%) was used for the weft; the weaving density was 50 filaments in the warp direction, 45 fibers/inch in the weft direction, and 45 fibers/inch in the weft direction. It was woven without twisting or twisting. Using the obtained greige fabric as a base material 11, a polyethylene film with a J' width of 60 microns was adhered to the front side of the fabric by melt extrusion and tIC laminated. An adhesive tape was made by applying a release agent to the front side of the roughly laminated Dake Ili and an acrylic acid resin adhesive to the back side. iq
The resulting adhesive tape had good manual tearability, had a beautiful cut, and had a tensile strength in the warp direction of 16 g/inch, which was satisfactory.

Actual/lIi Example 2 A polyethylene terephthalate multifilament with a total fineness of 75 denier and 24 filaments was interlaced under normal conditions, and an entangled treatment system with a strength of 4.2 g/denier and an apparent elongation of 18% was applied. #Ta. Using this entangling treatment system for the warp, polyethylene terephthalate multifilament (total fineness 75 denier, 15 filaments)
Strength: 4.8 g/denier, elongation: 38%) was used for the weft, and the R density was set to 55 threads/inch in the warp direction and 48 threads/inch in the $72 direction, so there was no twist.

It was woven without any glue. Based on the obtained /I-machine 4j, -C
An adhesive tape was obtained in the same manner as in Example 1 using a polyethylene film having a thickness of 50 microns. The resulting adhesive tape had good manual tearability and cut edges, had a tensile strength of 15 kg/inch, and a peel strength of 1.2 kg/1.5 cm width.

Comparative Examples 1-2 Total fineness 100 denier, 48 filaments (Comparative Example 1)
and 120 denier seven filament (Comparative Example 2)
An adhesive tape was prepared in the same manner as in Example 1 except that polyethylene terephthalate filaments were used for the weft, but the entangling and weaving properties were both poor, and the resulting adhesive tape was not easy to cut by hand.

Procedural amendment 1985, 10 month/day

Claims (1)

[Claims] Single yarn fineness is 0.1-5 denier, total fineness is 30-125
Denier, strength is 2.5 g/denier or more, apparent elongation is 20% or less, interlaced yarn is used as warp, single yarn fineness is 4 to 100 denier, thicker denier than warp, total fineness is 50 ~250 denier thread is used as weft thread,
Warp density 30-100/inch, weft density 25-70
A base fabric for an adhesive tape that is woven at a thread per inch and substantially without twisting or gluing.