JPS6315870A - Pressure-sensitive adhesive tape - Google Patents

Abstract

PURPOSE:To provide a pressure-sensitive adhesive tape which has a fine appearance and can be easily cut with fingers, by laminating a laminate layer on a pressure-sensitive adhesive layer and a substrate cloth layer, providing a scar on an edge line, said scars extending through the laminate layer, and allowing the warp of the substrate cloth to be weaker than the weft thereof. CONSTITUTION:A laminate layer 6 is formed on a substrate cloth layer 7 composed of a woven fabric (e.g., polyester woven fabric or vinylon woven fabric) prepd. by using a warp weaker than a weft by melt-extruding a resin such as low-density polyethylene, polyethylene terephthalate, etc., to prepare a laminated cloth 1. The laminated cloth 1 is passed between a rider roll and a processing roll equipped with many blades on its outer periphery to form a scar 2 which extends at least through the laminate layer 6, on one or both lines of two edge lines extending along the length of the laminated cloth 1. A pressure-sensitive adhesive is applied to the back of the cloth 1 to form a pressure-sensitive adhesive layer 8, thus obtaining the desired pressure-sensitive adhesive tape.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an adhesive tape, and more particularly to an adhesive tape that can be easily cut with fingers and has a beautiful appearance.

[Prior Art] High-strength adhesive tapes are commercially available that have a base fabric coated with rubber or resin and then have an adhesive layer attached thereto.

However, the improved strength makes it difficult to cut to arbitrary length by hand. To improve this, JP-A-58-
No. 93770, Japanese Unexamined Patent Application Publication No. 58-91845, etc. propose reducing the strength of the warp threads of a fabric serving as a base fabric.

On the other hand, although polypropylene adhesive tape without a base fabric is strong, it is difficult to cut into arbitrary lengths, so an example of creating scratches on the end surface of the wound tape with a file etc. is disclosed in JP-A-58-13680. It is stated in the official bulletin.

[Problems to be Solved by the Invention] However, in adhesive tapes in which the strength of the warp threads of the fabric is reduced, the warp threads are equally weak over the entire width of the tape, so they may easily break. Even when adhesive tapes are used for packaging and require a certain level of strength, they may break due to vibrations, shocks, etc., making it difficult for adhesive tapes to exhibit the strength originally required. there were.

In addition, the adhesive tape disclosed in Japanese Patent Application Laid-Open No. 58-13880 has a problem in that it is difficult to cut straightly when cutting polypropylene with scratches on the edges.

[Means for Solving the Problems] According to the present invention, there is provided an adhesive tape comprising an adhesive layer, a base fabric layer, and a laminate layer, in which one of two edge lines extending in the longitudinal direction of the adhesive tape or An adhesive tape is provided, characterized in that scars passing through at least the laminate layer are provided substantially on both edge lines, and the base fabric layer has weakened warp threads.

The adhesive layer may be a general-purpose adhesive, such as a conventional adhesive (for example, acrylic adhesive SK Dyne 17 manufactured by Soken Kagaku Co., Ltd.).
01) may be used.

The base fabric layer is made of staple fabric, vinylon fabric, polyester #
! In addition to fabric, it may be a blended fabric of staple fiber, vinylon, or polyester yarn, or it may be a knitted fabric as long as it exhibits the functions of the present invention.

In terms of strength and versatility, it is preferable to use polyester filaments for the warp and/or weft. In addition, the base fabric made of polyester can eliminate the disadvantages of strong paper F etc. when wet, and it can also be woven using a high-speed loom, such as a water jet loom, without twisting or gluing, thereby reducing costs. What advantages does it have?

The base cloth layer in the present invention has weakened warp threads. In the case of a woven fabric, the warp refers to a thread in the longitudinal direction of the adhesive tape, and the weft refers to a thread that is intertwined with the warp and runs in the width direction of the adhesive tape (a direction that crosses the length of the adhesive tape). In the case of knitted fabrics, the yarns extending in the course direction are called warps, and the yarns extending in the well direction are called wefts.The following various methods are used to weaken the warps.

■ A woven fabric using polyester multifilament, at least as the warp, in which unstretched portions and stretched portions are mixed in the yarn length direction.

Such woven fabrics are characterized in that their elongation is greatly reduced by heat treatment during lamination with a film such as a polyethylene film. In addition, in the above-mentioned fabric, the physical properties of the multifilament when weaving the base fabric, especially the elongation, are 50% or more, which is the main reason for reducing the high-speed weaving performance due to no twisting and no glue in a water jet loom. Since there is almost no fuzz, it can be woven extremely efficiently. Furthermore, when the above fabric is used as a base fabric layer and a film is laminated thereon, improved peel strength is exhibited. If the peel strength is too low, the product will be laminated in a roll, which will cause problems such as peeling of the base fabric layer and laminate layer when using adhesive tape.

In addition, a polyester multifilament in which unstretched portions and stretched portions are mixed in the L yarn length direction can be achieved by appropriately selecting the stretching conditions. That is, the preheating roller (10th-
setting the temperature of the glass below the glass transition point (
Generally, it is preferable to select the temperature between 55 and 65°C).
This is achieved by lowering the draw ratio. The drawing ratio is preferably set to 65 to 75% of the drawing ratio set when obtaining a normal drawn yarn.

■ Formula (1) in the molecular chain: (wherein X is -3O3Na, -X', -OR, -R'
, -0Ar te, -X' is a halogen group, R and R'
is an alkyl group, and At is an aromatic group that may have a nuclear substituent.

The connecting chain may be in the ortho, meta, or para position. m is an integer of 1 to 3, and n or p is an integer of O to 2.

) Fabrics using polyester flat yarn having residues shown in
(See Publication No. 45).

That is, the -4- polyester contains terephthalic acid as the main acid component, alkylene glycol having 2 to 6 carbon atoms, preferably ethylene glycol as the main glycol component, and a dicarboxylic acid having a residue represented by formula (1) or It is obtained by copolymerizing a diol as a copolymerization component or by blending a polyester obtained by condensation polymerization of a dicarboxylic acid having a residue represented by formula (1) with a diol and a normal polyester.

Here, royal carboxylic acids other than those mentioned above that can be used include, for example, isophthalic acid, naphthalene dicarboxylic acid, diphenyldicarboxylic acid, sebacic acid, 1.
Examples include aromatic, aliphatic, and alicyclic difunctional carboxylic acids such as 4-cyclohexanedicarboxylic acid. Also,"
Examples of diol compounds other than glycols include aliphatic, alicyclic, and aromatic diol compounds such as cyclohexane-1,4-dimetatool, neopentyl glycol, bisphenol A, and bisphenol S. . The acid content of the residue represented by formula (1) is 1 to
It can be used in a range of 30% by weight.

The fineness of the warp or weft is preferably 50 to 100 deniers.

■ Fabrics using spun yarns made of rayon staple fiber, vinylon fibers, or yarns obtained by blending rayon staple fibers or vinylon fibers with polyester filaments, etc., as warp threads.

It is advisable to use polyester multifilament with high strength for the weft of this item.

■ A woven fabric whose warp threads contain finely scratched polyester multifilament.

To create minute scratches, it is preferable to use a method in which, for example, a filament is bombarded with flowing metal powder, ceramic powder, or the like.

■ Filamen is made using a substance that is incompatible with polyester mixed into the raw material during polyester spinning]・
is manufactured and used as warp threads to create a woven fabric.

As the substance that is incompatible with polyester, inorganic powders, particularly inorganic substances whose particles have sharp parts, are preferable. In this case, the larger the particle size of the inorganic substance, the greater the effect of weakening the filament.

■ Gather a bundle of polyester multifilaments to a predetermined width and thickness, and use a heat treatment device as shown in Figure 10 at a temperature below the melting point of polyester and above the glass transition point to place minute intervals between the polyester filaments. A woven fabric using polyester filaments that are pressed together to make the suppressed parts thinner and weaker, and then use the weakened polyester filaments as warp threads.

In FIG. 10, 18 is a bundle of polyester multifilaments aligned in the l] direction, and 20 is a suppression roll, and the surface of this suppression roll has concave grooves and protrusions in the direction parallel to the axis of the roll. are arranged alternately. 21 is a heating roll which is heated to a temperature below the melting point of polyester and above the glass transition point. By being pressed between the suppression roll 20 and the heating roll 21, a filament in which weak portions and strong portions are alternately arranged is obtained.

The case where weakened warp yarns are used in woven fabrics has been exemplified above, but when such weakened yarns are used in knitted fabrics, it is preferable to use them in a structure that forms chain loops in the course direction.

The purpose of the laminate layer is to fix the fibers of the base cloth layer and make the surface beautiful, and to ensure uniform adhesion of silicone to improve releasability when wound.

The laminate layer is made of olefin resin such as low-density polyethylene (LDPE), low-pressure linear low-density polyethylene (L-LDPE), high-density polyethylene (HD
PE), polyethylene terephthalate (PET), polyamide, etc., or a multilayer composite of two or more selected from these may be used, and an anchor coat layer may be provided as necessary.

The lamination method may be any method such as dry, wet, extrusion, etc. A preferred material is anchor-coated LDPE, which is superior in ease of pressurization, strength, and versatility.

The scar needs to be provided through at least the laminate layer of the three layers. Depending on the type of base fabric layer, it may be provided even in the base fabric layer.

FIG. 2-A is a sectional view showing an adhesive tape provided with scars penetrating the laminate layer, and FIG. 2-B is a sectional view taken from a direction perpendicular to the cross-section of FIG. 2-A. FIG. 3 is a cross-sectional view showing an adhesive tape with scars penetrating the laminate layer and penetrating a part of the base layer. Figure 1-A is a sectional view showing an adhesive tape with scars penetrating all the layers, including the laminate layer, base fabric layer, and adhesive layer, and Figure 4-B is a cross-sectional view taken in a direction perpendicular to the cross section of Figure 4-A. FIG. In FIGS. 2-A to 4-B, 5 is an adhesive tape, 2 is a scar, 6 is a laminate layer, 7 is a base fabric layer, and 8 is an adhesive layer.

Although the shape and size of the scar do not matter, it is preferable that the scar has an acute-angled (notch-like) portion at the negative end so as to produce a non-chip effect. Moreover, it is preferable that the pressure-sensitive adhesive tape has an elongated shape in the direction perpendicular to the longitudinal direction as shown in FIG. 1-C and FIG. 5-A. Figures 5-A to 5-E are plan views for illustrating and explaining the shape of scars, and Figure 5-A is a short line having an elongated shape in a direction perpendicular to the longitudinal direction of the adhesive tape. Figure 5-B shows a triangular scar;
Figure 5-C shows a diamond-shaped scar, Figure 5-D shows a star-shaped scar, and Figure 5-E shows a dot-shaped scar.

Moreover, even if the scar is not punched out, it can be created by pressing, scraping, or tapping with a knife or a cutting tool such as that shown in FIG. 6.

The tool shown in FIG. 6 is provided with a protrusion 9 having an elongated cutting edge, and this protrusion 9 is made by making a pseudo-bevel-shaped cut 17 in a metal surface 16, as shown in FIG. It is manufactured by making the protrusion 9 protrude by making the cut metal part separated from the metal surface 18 stand up with the base of the triangular shape as the central axis. Note that the cut portion of the metal surface 16 remains as a depression 10.

The angle formed between the surface of the protrusion 9 on the recess side, that is, the metal surface of the upright surface 11, is preferably 60° or more and −90° or less.

Such protrusions are arranged in one or more lines, and the metal is hardened and used. FIG. 8 is a perspective view of a processing roll 12 provided with such projections on its circumferential surface.

When the laminated cloth l is pressed with the protrusion 9 as shown in FIG. The laminate layer on the side is expanded by the raised surface 15, and as shown in FIG. At the same time as the steps are different, there is also distortion. That is,
There will be parts with and without distortion at the boundaries of the cut, and the parts with distortion will remain as internal distortions even when the step difference disappears and the part returns to almost its original state. Its strength is reduced due to internal strain, and it has the important effect of being easily torn with fingers from the boundary between the strained and non-strained portions. Moreover, unlike when cutting with a normal knife, cracks are formed at both ends of the penetrating scar, and these cracks have a large cutting initiation effect.

FIG. 9 is an explanatory diagram showing an example of processing the laminated cloth 1 using the processing roll shown in FIG. 8. The processing roll 12 and the presser roll 13 are rotating in opposite directions at the same circumferential speed while being in contact with each other. The laminated cloth 1 passes through the contact area between both rolls.

At this time, the laminated cloth 1 is pressed by the projections 9 of the processing roll 12, and scars 2 are arranged as shown in FIGS. 1-A, 1-B, and 1-C. 14 is the original fabric of the lamination 1jj.

The tool for applying Z scars is preferably made of a hard material, and in addition to hardened steel, ceramics such as silicon carbide, titanium carbide, and silicon nitride can also be used. In addition, after finishing the shape of the tool with the metal material, the GVD method is applied.
Those obtained by coating with a thin film of silicon carbide, titanium carbide, etc. by the PVD method or the like are also preferable because they have excellent wear resistance and do not have poor sharpness.

In addition, regarding the depth of the blade that makes the scar, it may be necessary to reach only the laminate material, or the laminate material and the base fabric.
If these are selected in combination as appropriate depending on the application, more effects will be achieved.

According to the present inventors, although it depends on the type of base fabric of the adhesive tape used, IJ, etc., the position to make the scar is within about 5 mm from the edge of one or both sides of the adhesive tape.
The distance between the scars is 1 to 5 mm, and the scars may be arranged in two or more rows.

The part where the scar group is provided is the part that becomes the edge of the adhesive tape, and is preferably a part 0.5 to 3 inches inside the edge line.

As long as the scar group is substantially on the edge line, it is not drawn whether it is in one row or in multiple rows of 2 or more. When providing multiple rows, the width of the scar group is preferably within 5 mm, and 3.5 m.
It is more preferable to be within m.

Even if the pitch of the scar as shown in FIG. 1-C is long, the tearing property is exhibited, and the pitch can be as long as, for example, about 5 mm.

If the base fabric layer is a normal one (fabric with unweakened warp yarns) with only scars on the edges, tearing is easy at the initial stage of tearing, but the tearing strength increases during the tearing process, causing tearing. Although it may be difficult to tear, the adhesive tape of the present invention has a great feature in that it can be easily torn with a constant tearing force using the force of fingers from the initial stage of tearing to the time of completion of tearing.

[Example] Next, an example will be given and explained.

Example 1 Modified polyethylene terephthalate filament drawn yarn 70d/24f (strength 3.7
g/d, elongation 30%), using polyethylene terephthalate drawn yarn 1oOd/24f (strength 5.3 g/d, elongation 30%) as the weft, warp density 48 wood/inch, weft density 45
wood/inch (woven fabric RL) 137 cm ) Weaved without glue in a water jet loom to obtain a plain woven fabric, which was used as a base fabric for adhesive tape.

Here, as shown in FIG. 1, low-density polyethylene was melt-extruded on the base fabric 7 and laminated 6 to a thickness of 5 (Ig, m) to prepare a laminated fabric 1.

Next, as shown in Figure 8, a 5cm rotary blade with 7 rows of 0.5mm 11 blades arranged at 1.5mm intervals on the outer periphery.
Two groups of scars each having a width of about 3.5 mm (penetrating the laminate layer and the base material IIj layer) were formed by arranging them in 27 rows at intervals and rolling them up.

Thereafter, an adhesive was applied to form an adhesive layer 8, and the central part of the scratch trace group was cut along the cutting line 4 to obtain an adhesive tape 5 having an adhesive tape width 3 of 5 cm.

The material according to the present invention was very easy to cut, and the cut surface was very beautiful.

b Example 2 Polyethylene terephthalate (ηsp/c=0.73
) was melt extruded in a conventional manner and wound up at 1500 m/min. The yarn was then drawn under the following conditions to obtain a drawn yarn of 70 d/24 f.

10th - Rani 60°C Hot play 1-: 130°C Stretching ratio: 2.3 times The obtained drawn yarn has a mixture of unstretched parts and stretched parts in the yarn length direction, and its physical properties are strength: 3.2g/d, elongation: 56
．． 5%, and the number of entanglements caused by the air injection nozzle applied during stretching: 36 pieces/m.

The drawn yarn was warped in a conventional manner, wound onto a beam without glue, and woven at 420 rpm in a water jet loom. The weft used was ordinary polyethylene terephthalate drawn yarn 100d/48f, and the weaving density was warp/weft -48/45 (unit: wood/25',
4 mm).

Low-density polyethylene was melt-extruded onto the base fabric layer obtained as described above and laminated to a thickness of 50 pm.Next, as shown in Figure 8, 0.0 mm was applied to the outer periphery at 2 mm intervals.
27 rotary blades with 6 rows of 5mm wide blades spaced at 5cm intervals
A group of scars with a width of about 3 mm (penetrating through the laminate layer and the base fabric layer) was created while being arranged in rows and rolled up. Thereafter, an adhesive was applied and the central part of the scar group was cut to obtain a 5 cmrll adhesive tape.

The adhesive tape of the present invention is very easy to cut by hand, has a beautiful cut edge, and uses yarn with unstretched parts (thick & thin) for the warp and normal yarn for the weft. It has a firm texture and is very easy to apply when packing tubular materials.

[Effects of the Invention] The adhesive tape of the present invention has a beautiful appearance because the laminate layer is further laminated on top of the adhesive layer and the base material layer, and the laminate layer has a beautiful appearance when rolled by applying a release agent. Excellent mold releasability. In addition, since the adhesive tape of the present invention has scars substantially on the edge line, it requires less initial force when tearing the adhesive tape with fingers. Because the fibers are weaker than the wefts, the tearing strength suddenly increases in the middle, and the tearing force remains constant until the tearing is completed. Furthermore, since the scars are provided on the edges, there is no need to weaken the warp threads excessively, and the adhesive tape can be made stronger accordingly.

[Brief explanation of the drawing]

1-A to 1-0 show an embodiment of the present invention,
Fig. 1-A is a plan view of the laminated cloth with scars, Fig. 1-B is a cross-sectional view thereof, and Fig. 1-0 is an enlarged view of the part A where the scars are provided in Fig. 1-A. . Figures 2-A to 4-B show scars of various depths;
Figure 2-A is a cross-sectional view showing an adhesive tape with scars penetrating the laminate layer, Figure 2-B is a cross-sectional view taken from a direction perpendicular to the cross section of Figure 2-A, and Figure 3 is a cross-sectional view of the adhesive tape with scars penetrating the laminate layer. A cross-sectional view showing an adhesive tape with scars penetrating into a part of the base fabric layer. A sectional view showing the tape, FIG. 4-B, is a sectional view taken from a direction perpendicular to the cross-section of FIG. 4-A. Figures 5-A to 5-E are plan views showing other examples of scars. Figure 6 is an enlarged view of the protrusion of the processing roll (tool) for creating scars, Figure 7 is a sectional view showing an example of the process of manufacturing the protrusion, Figure 8 is a perspective view of the tool, and Figure 9 is It is an explanatory view showing an example of processing of laminated cloth. DESCRIPTION OF SYMBOLS 1... Laminated cloth, 2... Scar channel, 3... Adhesive tape IJ, 4... Cutting line, 5... Adhesive tape, 6...
Laminate layer, 7... Base fabric layer, 8... Adhesive layer, 9...
...Protrusion, 10...Indentation, 11...Elevating surface, 12.
...Processing roll, 13... Presser roll, 14... Original fabric of laminated cloth, 15... Raised surface, 16... Metal surface, 1
7...notch, 18...ridge line, 20...heating roll.

Claims (1)

[Claims] (1) An adhesive tape consisting of an adhesive layer, a base fabric layer, and a laminate layer, wherein at least the laminate layer is provided substantially on one or both of two edge lines extending in the longitudinal direction of the adhesive tape. An adhesive tape characterized in that a penetrating scar is provided and the base fabric layer has weakened warp threads.