JPH0562547U - Double-sided adhesive tape - Google Patents

Abstract

(57) [Summary] [Structure] A double-sided pressure-sensitive adhesive tape comprising a strong pressure-sensitive adhesive layer on one surface of a substrate (support) and a weak pressure-sensitive adhesive layer on the other surface, wherein the strong pressure-sensitive adhesive layer is made of cloth or the like. When the 180 ° peeling force is measured with respect to either a long object or a tube core such as a paper tube 30
It has an adhesive strength of 0 g / 20 mm or more, the weak adhesive layer is lower than the adhesive strength of the strong adhesive layer by 200 g / 20 mm or more, and 300 g for a tube core or a long object which is not adhered to the strong adhesive layer. / Cm ↑ 2 or more shear adhesive strength. [Effect] When a long object is wound up on the tube core and then unwound, peeling from the tube core becomes easy, which leads to labor saving.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is to wind or unwind a cloth, such as paper, non-woven fabric, knitted fabric, or woven fabric, or a sheet-shaped long product such as various plastic films, onto a tube core made of paper tube, wood tube, plastic, or metal. This is related to the improvement of the double-sided adhesive tape used at the time of wearing.

[0002]

[Prior Art]

 Conventionally, when winding a long sheet-like material such as non-woven fabric, woven fabric, or knitted fabric around a tube core, a single-sided adhesive tape such as gum tape or a double-sided strong adhesive tape in which a strong adhesive layer is provided on both sides of a flat substrate Is used. Also, a method of attaching both by using a surface fastener (trade name: Magic Tape) has been proposed.

[0003]

[Problems to be solved by the device]

 However, it is easy to attach cloth etc. to the tube core by using single-sided strong adhesive tape such as gum tape or double-sided strong adhesive tape with strong adhesive layers on both sides of the base material, but remove the cloth etc. from the tube core. In this case, the machine has to be stopped once and forcibly removed from the tube core by hand, resulting in poor work efficiency. Further, when the tube core is a paper tube, the surface of the paper tube is often damaged. On the other hand, when the surface fastener is used, the fabric or the like can be removed automatically, but there is a drawback that its position is limited when it is attached and it takes time and effort to attach it.

[0004]

[Means for Solving the Problems]

 In order to solve the above problems, it has been found that the double-sided adhesive tape having the following structure is used in place of the conventionally used double-sided strong adhesive tape. That is, the double-sided pressure-sensitive adhesive tape of the present invention is a strong pressure-sensitive adhesive layer having a 180 ° peeling force of 300 g / 20 mm or more on one side of a long object such as cloth or a tube core on one surface of a flat substrate. Is provided by a method such as coating, and a weak adhesive layer having a 180 ° peeling force lower than the 180 ° peeling force of the strong adhesive layer by 200 g / 20 mm or more is provided on the other surface. In addition, this weak adhesive layer has a shear adhesive strength of 300 g / cm 2 or more with respect to the tube core (or long product) which is not adhered to the strong adhesive layer. In the double-sided pressure-sensitive adhesive tape of the present invention, a tape in which the weak pressure-sensitive adhesive layer is made of a fine porous material is preferably used. The "180 ° peeling force", which indicates the adhesive force of the double-sided adhesive tape of the present invention, is measured based on JIS Z0237-1980 (adhesive tape / adhesive sheet test method).

[0005]

[Action]

 When a double-sided adhesive tape with a difference in 180 ° peeling force is used to wind a long object such as cloth around the tube core, the strong adhesive surface is difficult to peel from the adherend, and the weak adhesive surface is easily peeled from the adherend. Therefore, long objects can be easily removed from the tube core. In addition, the weakly sticky surface also has a certain degree (300 g / cm ↑ 2 or more) of shear adhesive strength, so that it is possible to prevent a long object from shifting in the circumferential direction of the tube core.

[0006]

【Example】

 FIG. 1 is a vertical sectional view of the double-sided adhesive tape of the present invention. Reference numeral 1 is a base (support) of a double-sided adhesive tape, such as rayon nonwoven fabric, nonwoven fabric such as polyester paper, cotton cloth, polyester, woven fabric or knitted fabric such as plastic film, etc. JIS Z1528-1982 "Double-sided adhesive tape" The support shown in Table 1 of ". 2 is a strong adhesive layer and 3 is a weak adhesive layer. FIG. 2 is a schematic cross-sectional view showing a state in which the tip portion of a long object such as cloth is attached to the surface of the tube core via a double-sided adhesive tape having a difference of 180 ° peeling force. 4 is a long piece of cloth or the like, 5 is a partial cross section of the tube core, and the double-sided adhesive tape is composed of the adhesive layers 2 and 3 with the base material 1 sandwiched therebetween. Reference numeral 5 is a tube core such as a paper tube, a wood tube, a plastic tube or a metal tube.

In order to easily attach a long object such as cloth to the tube core and to easily remove the long object after unwinding the long object, the interface between the long object 4 and the adhesive layer 2 It is necessary that there is a difference of 200 g / 20 mm or more in terms of the adhesive force (180 ° peeling force) at the interface between the other adhesive layer 3 and the tube core 5. In this case, it does not matter which has the stronger peeling force, but here, the case where the peeling force at the interface between 4 and 2 is stronger than the peeling force at the interface between 3 and 5 will be explained. To do.

The peeling force at the interface between 4 and 2 is 300 g / 20 mm or more, preferably 500 g / 20 mm or more, more preferably 800 g / 20 mm or more, measured by 180 ° peeling force described in JIS Z0237-1980. Is desired. Here, the pressure-sensitive adhesive layer constituting 2 is an acrylic, rubber-based, silicone-based, or urethane-based pressure-sensitive adhesive, but the 180 ° peeling force is determined by the material, texture, and surface of the adherend (long product) 4. The pressure-sensitive adhesive must be appropriately selected because it greatly changes depending on the state.

On the other hand, the 180 ° peel force at the interface between 3 and 5 is 200 g / 20 mm or more, preferably at least 200 g / 20 mm from the peel force at the interface between 4 and 2 so that the tube cores 5 and 3 can be easily peeled off. It must be lower than 500 g / 20 mm. Therefore, the 180 ° peeling force at the interface between 3 and 5 is preferably 300 g / 20 mm or less, and more preferably 100 g / 20 mm or less.

However, in order to wind the long object 4 such as a cloth around the tube core 5, a certain amount of force in the circumferential direction of the tube core is required. That is, the shear adhesive strength at the interface between 3 and 5 is preferably 300 g / cm 2 or more, and more preferably 500 g / cm 2 or more. As the pressure-sensitive adhesive layer constituting No. 3, among the usual acrylic, rubber-based, silicone-based, and urethane-based adhesives, those having weak adhesion to the material of the tube core 5 are used. In this case, it is preferable to use a re-peelable pressure-sensitive adhesive that does not leave an adhesive residue on the surface of the adherend 5.

Further, it is preferable that the pressure-sensitive adhesive layer constituting 3 has a fine porous structure. In this case, as the porous layer, at least one elastic resin selected from acrylic resin, urethane resin, vinyl chloride resin, isoprene rubber, chloroprene rubber, butyl rubber, vinyl ether resin and the like is used. As a base, a pressure-sensitive adhesive composition prepared by blending a tackifier, a plasticizer, a cross-linking agent, a foaming agent, a pore stabilizer, an anti-degradation agent, etc., with the elastic resin to a desired thickness on a base sheet. It is applied and foamed and solidified by a dry foaming method to form a sponge-like porous structure having fine pores having a pore diameter of 250 μm or less and an apparent density of 0.1 to 0.6 g / cm ↑ 3. The pore size and pore size distribution of the porous structure can be controlled by adjusting the viscosity of the base resin, the amount of the crosslinking agent, the foaming agent, the pore stabilizer, the plasticizer, the solvent, etc., and the foaming conditions such as foam solidification temperature and processing time. It can be adjusted by selecting.

The pore size and apparent density of the porous layer affect the shear adhesion. That is, the porous layer has fine pores with a pore diameter of 250 μm or less and has a sponge-like porous structure with an apparent density of 0.1 to 0.6 g / cm ↑ 3. The preferred porous structure is 90% by volume or less, preferably 10 to 70% by volume of pores having a pore size of 10 to 250 μm, and the other micropores have a mixed type micropore structure having a pore size of less than 10 μm, and a porous layer By adjusting the state of openings and wrinkles formed on the surface to roughen the surface and reduce the contact area of the porous layer per unit area, the adhesive peel strength to the glass surface is 1 to 10 g / cm width. It can be adjusted.

When the relationship between the fine pores and the apparent density of the porous layer is larger than 250 μm or when the apparent density is less than 0.1 g / cm ↑ 3, the compression resistance of the porous layer is small. May decrease, the characteristics of the porous structure may be lost, the adhesive strength of the porous layer may be less than the fracture strength in the multi-porous layer, and the adhesive may remain on the mounting surface, which is not preferable. On the other hand, when the pores are mainly fine pores with a diameter of less than 10 μm or when the apparent density exceeds 0.6 g / cm ↑ 3 to form a dense porous layer, the surface of the porous layer becomes dense and the contact area is large. , The adhesive strength to the mounting surface becomes stronger, so that the mounting surface is contaminated, and there is an unfavorable effect such as a decrease in the anti-slip effect due to the adhesion of dust.

Since the porous layer having fine pores is effective even on a smooth surface, it is preferable to use it on the tube core side having a smooth surface. It can also be applied to fabric surfaces that have been smoothed to some extent by resin processing.

[Example 1] This example shows an example in which a polyester plain weave sack (base cloth for producing gum tape) is wound as a cloth on a tube core (reinforced paper tube). Polyester film was used as a base material for winding 5000 m of polyester plain weave sack (50d / 24f, 50 pieces / inch x 50 pieces / inch, width 130 cm) on a reinforced paper tube with an outer diameter of 4 inches and a thickness of 7 mm. A double-sided pressure-sensitive adhesive tape coated with a strong acrylic adhesive and a re-peelable acrylic adhesive on the opposite side was used. The adhesive strength of this adhesive tape is as follows: 180 ° peeling force on the strong adhesive side is 700 g / 20 mm, while 180 ° peeling force on the re-peelable acrylic adhesive side, which is a weak adhesive, is 200 g / 20 mm. The shear adhesive strength was 1500 g / cm ↑ 2. Using this adhesive tape, a polyester plain weave sack was wound up on a reinforced paper tube to form a roll, which was unwound at a speed of 30 m / min when introduced into a polyethylene laminating machine in the next step. Conventionally, the reinforced paper tube and the polyester plain weave sack cloth are adhesively fastened with gum tape, and it took time to remove and replace with a new roll, but by using the adhesive tape used in the present invention, Was easily detached at the end of unrolling, and it was easy to install a new roll.

[Example 2] This example shows an example in which a Happ base cloth (patch) is wound around a tube core. As a long product, a smooth (braided) 50d / 36f polyester processed yarn with a width of 50 cm is wound up 300 m on a tube core with an outer diameter of 86 mm, an inner diameter of 76 mm and a thickness of 5 mm. A method was used in which the base cloth was sandwiched between the tube cores and rolled up, and () a base cloth was attached to the tube cores with gum tape. However, in the method (), the base cloth cannot be wound by the shaft drive method, and in the method (), the base cloth does not come off from the tube core at the innermost layer of unwinding, so it is necessary to stop the operation and peel the gum tape by hand. was there.

On the other hand, a polyester paper is used as a base material, an acrylic strong adhesive agent is used on one surface of the base material, and an acrylic resin is used on the opposite side with the base material interposed therebetween. By using a double-sided pressure-sensitive adhesive tape with a porous body layer formed on it, the tube core and the base cloth are adhered together, and the base cloth can be easily wound up without using lead paper to form a roll. I was able to do it. The 180 ° peeling force of the double-sided adhesive tape on the strong adhesive side was 1000 g / 20 mm, the 180 ° peeling force on the weak adhesive side was 300 g / 20 mm, and the shear adhesive force was 5000 g / cm ↑ 2. Met. Further, when the roll was attached to the unwinding device for the laminating machine in the next step and unwinding was carried out at 10 m / min, the tube core and the base cloth were easily separated from each other in the innermost layer portion without applying tension, The automatic anti-detection machine detected the dripping at the end and automatically stopped the machine, and it was possible to replace it with a new roll.

[0018]

[Effect of the device]

 The double-sided pressure-sensitive adhesive tape of the present invention can be installed without soiling or damaging the surface of the tube core with the adhesive of the pressure-sensitive adhesive tape when winding, unwinding or rewinding a long object such as cloth onto the tube core. Also, it is easy to remove, and labor can be saved in terms of work.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view of a double-sided adhesive tape of the present invention.

FIG. 2 is a schematic cross-sectional view showing an example in which the tip portion of a long object such as cloth is attached to a tube core using the double-sided adhesive tape of the present invention.

[Explanation of symbols]

 1 Base material of double-sided adhesive tape 2 Strong adhesive layer 3 Weak adhesive layer 4 Long material such as cloth 5 Tube core

Claims (1)

[Scope of utility model registration request] 1. A double-sided pressure-sensitive adhesive tape used for winding a sheet-shaped long object around a tube core, the tape comprising a flat base material sandwiched between the long object and the tube core. It has a strong adhesive layer having a 180 ° peeling force of 300 g / 20 mm or more with respect to either one, and the other surface is 200 g more than the 180 ° peeling force of the strong adhesive layer.
/ 20 mm or more and a weak pressure-sensitive adhesive layer having a low 180 ° peeling force, and the weak pressure-sensitive adhesive layer is 300 g / cm ↑ for a tube core or a long object which is not adhered to the strong pressure-sensitive adhesive layer.
A double-sided adhesive tape having a shear adhesive strength of 2 or more.