JPH0711210A - Production of tacky adhesive tape roll - Google Patents

Abstract

PURPOSE:To produce a tacky adhesive tape roll having decreased stickiness and side-stick by roughening the side face of a tacky adhesive tape roll. CONSTITUTION:A tacky adhesive layer is formed on one surface of a substrate 1 for a continuous broad tacky adhesive tape tearable in the pulling direction of the substrate and subjected to continuous embossing or partial cutting treatment. The substrate is slit along the part subjected to embossing or partial cutting treatment and wound on a winding core in multiple layers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an adhesive tape wound body in which stickiness and side sticks are reduced without going through a slit process.

[0002]

2. Description of the Related Art When an adhesive tape wound body is packed so that its side surfaces are in contact with each other, the adhesive sticks out from the side surface due to the winding tightening pressure of the wound body, causing "stickiness" of the side surface or "sticking" between the side surfaces. (Since it is difficult to separate by raising (side stick), a separator such as glassine paper is inserted between the adhesive tapes for packaging. However, this method requires one separator for each roll of the adhesive tape, and since this separator is discarded at the time of use, it has a problem of wasting resources.

As a method of reducing stickiness and side sticks on the side surface of an adhesive tape roll without using such a separator, for example, when slitting a wide adhesive tape raw material by a score method, a pleated shape is used. After slitting into a zigzag shape using a round blade with a blade, it is wound on a core and formed unevenly on the side surface of the adhesive tape roll body to prevent sticking due to the adhesive protruding to the side surface of the adhesive tape roll body. The way is done.

However, in the above method, since the cutting width differs depending on the size of the adhesive tape, the position of the round blade has to be changed depending on the size, which is troublesome.
Further, there is a problem that the round blade must be replaced when the blade of the round blade is worn.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to form tackiness and side sticks by forming irregularities on the side surface of an adhesive tape wound body. It is an object of the present invention to provide a method for producing a pressure-sensitive adhesive tape wound body, in which

[0006]

A method for manufacturing an adhesive tape wound body according to the present invention comprises a long and wide width in which a tearable embossing process or a partial cutting process is continuously provided in a drawing direction of a substrate. A pressure-sensitive adhesive layer is formed on one side of a base material for pressure-sensitive adhesive tape, and then the base material is cleaved along the portion that has been subjected to the embossing process or the partial cutting process, and is wound on a winding core.

The substrate used in the method for producing an adhesive tape roll of the present invention is not particularly limited, and examples thereof include papers such as high-quality paper and kraft paper; soft polyvinyl chloride, soft polyurethane, polypropylene, polyethylene, Synthetic resin films or sheets such as polyethylene terephthalate; those made of a laminate of a synthetic resin film and paper and the like can be mentioned.

As the base material, there is used a long wide base material which is continuously subjected to a tearable embossing process or a partial cutting process in a drawing direction of the base material.

As a method of performing the embossing process, for example, as shown in FIG. 1, a pinch is performed while heating and rotating an embossing roll 2 having a protrusion (not shown) of a regular square pyramid mounted on the peripheral surface of the roll. There is a method in which one side of the wide long base material 1 is pressed against the embossing roll 2 by the roll 3 to form the recess 10 of the inverted quadrangular pyramid on the surface of the base material 1.

As shown in FIG. 2, it is preferable that the apexes 13 of the inverted quadrangular pyramid are arranged linearly on the base material 1 at a constant pitch, and the shape of the bottom surface of the concave portion 10 is It may be square or rhombic. In addition, the concave portion 10
The length of the diagonal on the bottom surface 11 of the inverted quadrangular pyramid on the base material 1 is about 0.5 to 10 mm, and the height 12 of the inverse quadrangular pyramid is 50 to 100% of the thickness of the base material 1. Is preferred.

The shape, pitch, height and the like of the inverted quadrangular pyramid are appropriately determined depending on the type and thickness of the material used for the base material.

When an external force is applied to the end of the embossed base material 1 to cause tearing, the tearing proceeds along the ridge line 13 of the recess 10 near the end,
One recess 10 is torn. Further, as the tear propagates to the adjacent recesses, the base material 1 is cut along the linearly arranged embossments.

The above-mentioned partial cutting process is performed by cutting perforations and is composed of a cut portion and a non-cut portion, and the distance between the two portions depends on the kind and thickness of the material used for the base material. It is determined as appropriate depending on the circumstances. Further, this partial cut portion does not necessarily have to be linear, and may be provided in a zigzag shape.

As a method of performing such a partial cutting process, for example, a method of pressing a gear-shaped rotary saw blade against a base material to cut it can be mentioned.

The embossing process and the partial cutting process are provided to form continuous irregularities on the side surface of the base material when the base material is cut into a constant width, and the base material is coated with an adhesive. It is preferable that the connection state is maintained until it is dried, and the connection state is such that it can be relatively easily cleaved at the time of disconnection.

The embossing process and the partial cutting process described above are arranged at a constant interval in accordance with the product width of the adhesive tape, so that a large number of partial cutting parts can be simultaneously provided in the drawing direction of the wide base material. .

Next, a pressure sensitive adhesive is applied to one surface of the embossed or partially cut base material and dried to form a pressure sensitive adhesive layer, after which the base material is embossed or partially cut. The small wound adhesive tape wound body is obtained by cleaving the wound portion and winding it on the winding core.

The pressure-sensitive adhesive is not particularly limited, and rubber-based or acrylic pressure-sensitive adhesives are used. Further, as a method of applying the pressure-sensitive adhesive to the base material, a method used for the pressure-sensitive adhesive coating of a normal pressure-sensitive adhesive tape can be used.

[0019]

EXAMPLES Examples of the present invention will be described below. (Example 1) The bottom surface is a square having a diagonal line of 1 mm, and regular square pyramids having a height of 800 μm are arranged at a pitch of 1 mm and have a diameter of 280 m.
1 emboss roll mounted on the circumference of a metal roll
After heating to 30 ° C., one side of a wide long polyethylene film substrate was pressed against the embossing roll, and the substrate was subjected to continuous embossing. Acrylic pressure sensitive adhesive is applied to the base material by a roll coater and dried to form a pressure sensitive adhesive layer, which is then cleaved along the embossed portion of the base material and wound on a winding core to make a small A rolled adhesive tape roll was obtained.

[Evaluation of Side Stick Property] The pressure-sensitive adhesive tape roll was heated at 40 ° C. for 1 week, and then one side was 10 m.
A square aluminum plate of m is attached to the side surface of the roll, and 2k
A load of g was applied and pressure was applied for 15 seconds. Then, after the pressure-sensitive adhesive tape roll was fixed so that the aluminum plate faced downward, a load of 50 g in the vertical direction was applied to the aluminum plate to measure the time until it dropped, and it was 7 seconds.

(Comparative Example 1) A wide and long adhesive tape made of polyethylene film as a base material ("# 490" manufactured by Sekisui Chemical Co., Ltd.).
The N ") roll was subjected to the same embossing as in Example 1, and then a small roll adhesive tape roll was obtained by a score method using a round blade having a pleated blade. The side stickiness of this adhesive tape roll was evaluated in the same manner as in Example 1 and it was 12 seconds.

(Comparative Example 2) A wound body of a wide and long adhesive tape ("# 490N" manufactured by Sekisui Chemical Co., Ltd.) was embossed in the same manner as in Example 1 and then scored using a leather blade. Then, a small roll of adhesive tape was obtained. The side stick property of this adhesive tape roll was evaluated in the same manner as in Example 1 and it was 90 seconds.

[0023]

The method for producing a pressure-sensitive adhesive tape wound body of the present invention is as described above, and the base material is cut along the cut portion provided in the base material to form unevenness on the side surface of the pressure-sensitive adhesive tape wound body. By forming, the step of slitting the tape wound body can be omitted, and stickiness and side stick of the adhesive tape can be further reduced.

[Brief description of drawings]

FIG. 1 is a side view showing an example of a method of embossing a substrate.

FIG. 2 is a schematic cross-sectional view showing an embossed base material.

[Explanation of symbols]

 1 Base Material 2 Embossing Roll 3 Pinch Roll 4 Cooling Roll 10 Recessed Area 11 Bottom Surface 12 Height 13 Ridge Line

Claims (1)

[Claims] 1. A pressure-sensitive adhesive layer is formed on one surface of a long substrate for wide-width pressure-sensitive adhesive tape, which is continuously subjected to embossing or partial cutting capable of tearing in the direction of pulling out the substrate. A method for producing a pressure-sensitive adhesive tape wound body, which comprises cleaving the base material along the embossed or partially cut-off portion, and winding the base material over a wound core.