KR101985993B1 - Wound roll - Google Patents

Abstract

Provided is a winding roll capable of suppressing deformation resulting from a stepped portion of a laminated sheet in the peripheral portion of a wound core member and improving the yield of the pressure sensitive adhesive sheet. The take-up roll of the present invention is a take-up roll 30 in which a laminated sheet 10 is wound around a wound core member 31. The laminated sheet 10 is laminated so as to be in contact with the adhesive sheet 21 and the adhesive sheet 21 Wherein the adhesive sheet 21 comprises the base film 23 and the adhesive layer 21 and the peeling force between the adhesive sheet 21 and the relaxed layer 11 is 0.02 to 2 N / 25 mm, and the compressibility of the relaxed layer 11 is 1.5 to 15%.

Description

{WOUND ROLL}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding roll comprising a laminated sheet wound around a core.

BACKGROUND ART Conventionally, sheets such as a base film such as a wrap film, a metal foil, a paper, a printed matter, an adhesive sheet and the like are generally rolled up in a rolled state by winding the end of a long sheet around the core at the final stage of the manufacturing process. Such a sheet is often rolled up after the end portion is fixed to the core member with an adhesive tape or the like. However, the thickness of the sheet itself and the thickness of the fixing adhesive tape may cause a step on the sheet in the vicinity of the core member . The presence of this step is caused by the fact that as the total length of the sheet becomes longer, a load is generated from the surface of the sheet toward the center of the core in the process of winding the long sheet by rotating the core (so- There is a case where deformation due to the step is generated in some cases.

In the case of a sheet such as a wrap film whose thickness is thin and the deformation is hardly affected by the use of the sheet, the influence of deformation is small. However, in the case of a sheet which is easily deformed such as a metal foil, Or in the case of a printed matter or the like, deformation due to the step may occur in the sheet. The deformation of the sheet occurs in a range of several tens of m to 100 m from the core material depending on the thickness and the rigidity of the sheet, so that the yield of the sheet is lowered and the value of the product is lowered. Deformation of the sheet is also problematic in the case of an adhesive sheet using a base film. In particular, in the case of a pressure-sensitive adhesive sheet in which the unevenness of the surface needs to be precisely controlled, deformation of the sheet greatly influences the yield of the pressure-sensitive adhesive sheet.

Thus, in Patent Document 1, a method of forming a step on the winding core itself has been proposed in order to prevent deformation of the sheet by preventing steps of the sheet caused when the sheet is wound.

Patent Document 2 discloses a method in which an elastic layer is formed on the outer periphery of a wound core member to avoid or reduce a step of a mounting portion.

Patent Document 3 discloses a method in which a cover is formed at a position where a sheet is placed on a reel core to avoid or reduce steps.

Japanese Patent Application Laid-Open No. 2007-246192 Japanese Patent Application Laid-Open No. 2000-351278 Japanese Patent Application Laid-Open No. 2008-260601

However, in the method of forming the step on the wound core member, since it is necessary to prepare a large number of wound core members having a step according to the thickness of the sheet, efficiency is inferior in terms of production cost.

Further, the method of providing the elastic layer to the wrapping core material is not particularly limited as long as the total length of the sheet is a long sheet of 100 m or more, the stress applied to the core of the long sheet by the presence of the elastic layer, It is difficult to appropriately control the stress generated in the sheet, and wrinkles derived from the stress in the sheet are generated and the yield is lowered in some cases.

In addition, the method of forming the cover on the wound core member requires the cover to be made of metal because of necessity of repeated use, and it is necessary to make the end portion sharp in order to reduce the step, There was a problem of.

It is an object of the present invention to provide a pressure sensitive adhesive sheet which is excellent in safety of an operator and which does not require stepped processing of a wound core member and which suppresses deformation due to the stepped portion of the sheet around the periphery of the wound core member, Which can improve the yield of the wound roll.

The take-up roll of the present invention is a take-up roll comprising a laminated sheet wound around a wound core member, and the laminated sheet has an adhesive sheet and a relaxed layer laminated so as to be in contact with the adhesive sheet. The pressure-sensitive adhesive sheet has a base film and a pressure-sensitive adhesive layer. The pressure-sensitive adhesive sheet and the pressure-sensitive layer have a peeling force of 0.02 to 2 N / 25 mm and a compressibility of 1.5 to 15%.

According to the present invention, it is possible to alleviate the stress resulting from winding the laminated sheet to the adhesive sheet when winding the laminated sheet, by setting the relaxed layer to a predetermined compression ratio and making the relaxed layer and the adhesive sheet to have appropriate peeling force. As a result, it is difficult to cause deformation of the laminated sheet. Furthermore, the relaxed layer is brought into close contact with the pressure-sensitive adhesive sheet, whereby occurrence of deformation such as streaks or wrinkles can be suppressed.

Further, it is possible to alleviate the step of the winding front end portion of the laminated sheet when the laminated sheet is wound up, without requiring the operator to install the elastic layer or the cover, . As a result, it is possible to provide a winding roll that suppresses deformation resulting from a step of a sheet at the peripheral portion of the core, and realizes improvement in the yield of the pressure-sensitive adhesive sheet. Therefore, it is possible to suitably apply to a pressure sensitive adhesive sheet having a long overall length (referred to as a long sheet).

1A is a schematic cross-sectional view showing an example of a laminated sheet of the present invention.
1B is a schematic cross-sectional view showing an example of a laminated sheet of the present invention.
2 is a partially enlarged schematic view for explaining a winding roll of the present invention.
3 is a view showing a method of measuring the compression ratio in a side view.

In the present description, "sheet", "tape" and "film" are synonymous. Further, the " cast adhesive tape " is an adhesive tape made of only a pressure-sensitive adhesive layer without a substrate or core. In the drawings described below, the same reference numerals are assigned to the same element members, and the description of the overlapped portions is omitted.

The winding roll of the present invention is composed of a roll wound on the winding core as described below. 1A and 1B are schematic cross-sectional views showing an example of a laminated sheet of the present invention. The laminated sheet 10 has at least the relieving layer 11 and the pressure-sensitive adhesive sheet 21 laminated to be in contact with the relieving layer 11.

The adhesive sheet 21 of Fig. 1A includes a base film 23 serving as a core, a first pressure-sensitive adhesive layer 22a for holding the same, a second pressure-sensitive adhesive layer 22b, and a release layer 24 formed on the surface layer. This is an adhesive sheet. The adhesive sheet 21 of Fig. 1B is a single-sided adhesive sheet on which a pressure-sensitive adhesive layer 22 is provided on one side (on the side of the relaxed layer 11) of the base film 23 functioning as a base. The adhesive sheet 21 is a member to be wound on the core. The pressure-sensitive adhesive sheet 21 can have various laminated structures depending on applications and requirements. As a preferred embodiment, a double-sided pressure-sensitive adhesive sheet (see Fig. 1A) having a pressure-sensitive adhesive layer on both sides thereof using a base film as a core material can be mentioned. The pressure-sensitive adhesive sheet 12 is also suitable for use as a marking film or a pressure-sensitive adhesive sheet having an inkjet image-receiving layer.

The base film 23 used in the adhesive sheet 21 is a base material or a core material. Specifically, polyolefin-based resins such as polypropylene, polyethylene, polycycloolefin, and ethylene-vinyl acetate copolymer; Polyester resins such as polyethylene terephthalate and polyethylene naphthalate; Polyvinyl alcohol, triacetyl cellulose, polyvinyl chloride resin, polycarbonate resin, polynorbornene resin, polyarylate resin, acrylic resin, urethane resin, acrylic / urethane resin, polyphenylene sulfide resin, polystyrene resin, vinyl Based resins, polyimide-based resins, and resins obtained by compounding these resins. In addition, it is also suitable for a metal having electrical and / or ductility, such as aluminum, copper, silver and gold, and a metal foil of the alloy. The base film 23 may be a laminate of a plurality of films or a foam. The thickness of the base film 23 may be any thickness as long as it is a general adhesive tape, and is not particularly limited, but is preferably 2 m to 500 m, more preferably 10 m to 300 m.

The pressure-sensitive adhesive layer 22 (in the following description, the pressure-sensitive adhesive layer 22 includes the first pressure-sensitive adhesive layer 22a and the second pressure-sensitive adhesive layer 22b in FIG. It is preferably formed from a pressure-sensitive adhesive. Specific examples thereof include acrylic pressure sensitive adhesives, urethane pressure sensitive adhesives, rubber pressure sensitive adhesives, silicone pressure sensitive adhesives, and polyester pressure sensitive adhesives. The thickness of the pressure-sensitive adhesive layer 22 is preferably 1 to 200 占 퐉, more preferably 5 to 100 占 퐉.

The release layer 24 plays a role of enhancing the peelability of the surface layer of the relaxed layer 11 and the surface layer of the adhesive sheet 21 when the laminated sheet 10 is wound around the core. The peeling layer 24 is preferably a peelable film or a peeling resin layer.

The thickness of the adhesive sheet 21 is not particularly limited, but is preferably 2 m to 1 mm, and more preferably 15 m to 500 m.

The relaxed layer 11 has a function of relieving the deformation stress applied to the adhesive sheet 21 at the time of winding the laminated sheet 10 in contact with the adhesive sheet 21 and suppressing the deformation of the adhesive sheet 21 do. For this stress relaxation, the compressibility of the relaxed layer is set in the range of 1.5 to 15%. A more preferable range of the compressibility of the relaxed layer 11 is 1.5 to 10%. By setting the compressibility of the relaxed layer to 1.5 to 15%, the stress applied when the adhesive sheet 21 is wound on the core material can be relaxed. As a result, the pressure sensitive adhesive sheet is hardly deformed, and the yield of the laminated sheet 10 is improved. The peeling force between the adhesive sheet 21 and the relaxed layer 11 is preferably 0.02 to 2 N / 25 mm.

1A and 1B is composed of a laminate of two layers of a cushion layer 12 and a release layer 13. [ However, this is an example, and if it satisfies the specific compressibility and the appropriate peeling force with the pressure-sensitive adhesive sheet, it is possible to constitute only a single layer or to laminate another layer.

The thickness of the relaxed layer 11 is not particularly limited as long as the stress can be alleviated and the deformation of the sheet layer can be suppressed. The thickness is preferably 10 to 500 占 퐉, more preferably 20 to 300 占 퐉. By setting the thickness to 10 to 500 占 퐉, the stress can be relaxed and the deformation can be suppressed more effectively. Also, since it is an appropriate thickness, it is preferable from the viewpoint of cost.

The compression ratio of the relaxed layer of the present invention is a value obtained by the following method.

That is, the relaxed layer is cut into a disk having a diameter of 22.4 mm, and 10 sheets are stacked to form a measurement sample. The measurement sample is settled in a constant temperature and humidity chamber of 23 ° C and 50% for 24 hours or more. Thereafter, the thickness T1 of the sample to be measured after one minute from the application of 300 g / cm < 2 > as the first load to the sample to be measured is measured. Next, in the T1 measurement, a total thickness of 1800 g / cm < 2 > is added to the measured sample by adding 1500 g / cm < 2 > as a second load, and the thickness T2 after one minute is measured. Then, the compression rate is obtained from the following equation (1).

Expression (1) Compression rate (%) = (T1-T2) / T1 × 100

As a material for increasing the compressibility of the relaxed layer, for example, paper, a nonwoven fabric, a foam, an elastic gel, and an elastomer can be exemplified. Examples of the paper include glassine paper, high-quality paper, kraft paper, art paper, coated paper, and synthetic paper. Examples of the foam include a polyethylene-based resin, a polypropylene-based resin, and a polyurethane-based resin. Examples of the nonwoven fabric include paper made by pulp fibers, rayon fibers, hemp fibers, fibrous polyolefin resins, fibrous polyethylene terephthalate resins, and the like. Examples of the elastic gel include an acrylic resin, a urethane resin, and a silicone resin. Examples of the elastomer include natural rubber, styrene isoprene block copolymer, styrene butadiene block copolymer, acrylic rubber, silicone rubber, vinyl ether copolymer and urethane rubber. Among these materials, paper is preferable.

The relaxed layer 11 may be composed of only the cushion layer 12, but it is preferable that the release layer 13 is laminated. By laminating the release layer 13, the peeling force with the pressure-sensitive adhesive sheet 21 can be made appropriate.

The peeling layer 13 is preferably a peelable film or a peeling resin layer. The peelable film can be selected as follows according to the adhesive force of the adhesive sheet. For example, when the adhesive strength is high, a film (also referred to as a separator) on which a surface is subjected to a peeling treatment such as a silicon treatment or a fluorine treatment is preferable. On the other hand, when the adhesive strength is low, a film without peeling treatment such as polyethylene or polyethylene terephthalate can be used. The peelable resin layer can be formed by directly applying a releasing agent such as a silicone treatment agent or a fluorine treatment agent to the relaxed layer without using a peelable film.

When the adhesive sheet 21 is a one-sided adhesive type as shown in Fig. 1B, it is preferable to subject the surface of the release layer 13, which is in contact with the pressure-sensitive adhesive layer 22, to a release treatment such as silicone treatment or fluorine treatment. When the adhesive sheet 21 is a double-sided adhesive type as shown in Fig. 1A, a film or paper (also referred to as a separator), which is subjected to a peeling treatment such as a silicon treatment or a fluorine treatment, may be laminated on the outer main surface of the relaxed layer 11 have. In the case of forming the second pressure-sensitive adhesive layer 22b as the outermost layer without forming the release layer 24, when the surface 11B of the pressure-sensitive adhesive sheet 11 and the surface of the pressure-sensitive adhesive layer 11 are wound around the laminated sheet 10 The surface 11B of the relaxed layer 11 may be subjected to a peeling treatment such as a silicon treatment or a fluorine treatment in order to prevent the peeling force at the time of starting the winding of the laminated sheet 10 from becoming excessive.

A method of adhering the releasable film to the relaxed layer 11 is not particularly limited, but a known adhesive, a double-faced adhesive tape, or a cast adhesive tape is preferably used.

As a more preferable embodiment of the relaxed layer 11, a peelable film is used as the peeling layer 13, and paper is used as the cushion layer 12. The paper is preferably a top paper or a kraft paper. Paper may be stretched or shrunk due to the influence of humidity in the atmosphere. For this reason, when paper is used for the cushion layer, wrinkles may occur on the adhesive tape due to the expansion and contraction. Therefore, from the viewpoint of effectively preventing elongation and shrinkage, it is preferable to form a resin layer of plastics on paper.

In order to wind the laminated sheet 10 on the winding core, the laminated sheet 10 needs to have adhesiveness at least to the extent that the adhesive sheet 21 and the relaxed layer 11 are not peeled off naturally. Specifically, the peeling force is preferably 0.02 N / 25 mm or more. The upper limit of the peeling force may be as long as the pressure-sensitive adhesive sheet is not deformed. Therefore, the peel force is preferably 2 N / 25 mm or less. The peel force is more preferably 0.05 to 1.5 N / 25 mm. Peeling force is 0.02 to 2 N / 25 mm. Even when stress is applied when the adhesive sheet is wound, the adhesive sheet is hardly wrinkled, and it is difficult to cause peeling damage on the adhesive sheet when peeling off the relaxed layer. As described above, the relaxed layer is different from a so-called laminated sheet or a simple peelable sheet.

It is also preferable that the thickness of the relieving layer 21 does not excessively exceed the thickness of the pressure-sensitive adhesive sheet 21 in relation to the thickness of the pressure-sensitive adhesive sheet 21 and the relieving layer 11. The thickness A of the adhesive sheet 21 and the thickness B of the relaxed layer 11 are preferably from 0.5 to 10 and more preferably from 1 to 5.

The peel force is measured by cutting the laminated sheet to a length of 25 mm width and a length of 200 mm. Then, the adhesive sheet side of the sample is fixed to a plate material, for example, an aluminum plate, which is less likely to be deformed, by double-faced adhesive tape, and then the relaxed layer 11 is peeled off at a peeling speed of 300 mm / min and a peeling angle of 180 °. The peel force is measured in an atmosphere of a temperature of 23 DEG C and a humidity of 50% RH in accordance with JIS-Z0237.

A method for evaluating whether or not deformation has occurred on the pressure sensitive adhesive sheet of the present invention is, for example, a method in which the pressure sensitive adhesive sheet is cut at every 1 m from the end where the wound core is wound to form a sample, It is possible to evaluate the deformation of the adhesive sheet by using light as a light source and by measuring the length from the end of the portion where the sample is streaked or uneven.

When the adhesive sheet of the winding roll of the present invention is used, for example, in a light-transmitting signboard provided with a light source therein, there is a possibility that the unevenness on the adhesive sheet lowers the visibility thereof, thereby deteriorating the merchantability. A method of evaluating the visibility is, for example, a method in which a pressure-sensitive adhesive sheet is cut at a position of 90 m from the end where the core is wound, and a laminated plate adhered to an acrylic plate having a thickness of 2 mm is used as a sample. Or the like as a light source can be evaluated as to whether or not the sample is contaminated.

The winding core of the present invention is not particularly limited, but examples thereof include paper tubes, metal tubes and plastic tubes. In general, it is a long lengthwise pipe used as a winding device attached to a manufacturing apparatus such as a printing machine, a coating machine, a molding machine, and a sintering machine. The above-mentioned core material is preferably about 1 to 40 cm in diameter. The width of the core material may be any width as long as it can be provided on the winding device, and is not particularly limited. Generally, it is about 2 mm to 6 m.

The laminated sheet 10 can be wound by pressing the tip of the laminated sheet 10 against the core. Fig. 2 is a partially enlarged explanatory view of the winding roll of the present invention. The winding roll 30 has a configuration in which the laminated sheet 10 is wound around the winding core 31. The laminated sheet 10 is wound so that the relieving layer 11 is downward and the adhesive sheet 21 is upward. Contrary to the example of Fig. 2, the adhesive sheet 21 of the laminated sheet may be downward.

Conventionally, there has been a problem that when the adhesive sheet is wound around the core, the base film and the pressure-sensitive adhesive layer are deformed by the stepped portion, thereby lowering the yield of the pressure-sensitive adhesive sheet. However, according to the laminated sheet of the present invention, as shown in Fig. 2, the stepped portion formed by repeatedly winding the laminated sheet 10 around the winding start end portion of the laminated sheet 10 can be relieved The layer 11 is formed. As a result, deformation of the pressure-sensitive adhesive sheet can be minimized.

As another method for winding the laminated sheet 10, a method of fixing the leading end of the laminated sheet 10 to the core by using an adhesive member and winding the laminated sheet 10 can be exemplified. Examples of the adhesive member include a double-sided adhesive tape, a cast adhesive tape, and a single-sided adhesive tape. As a first method, a method of fixing the tip end of the surface of the relaxed layer 11B of the laminated sheet 10 to the core material using a double-faced adhesive tape can be exemplified. As a second method, a method of fixing the adhesive sheet 21 of the laminated sheet 10 downward and fixing the tip of the adhesive sheet 21 to the core with the adhesive tape can be exemplified. When the adhesive member is used, the step structure of Fig. 2 becomes larger by the thickness of the adhesive tape. However, by forming the relaxed layer 11, compression can be urged in the thickness direction, and the step can be reduced.

In addition, conventionally, when used as a marking film or an inkjet image receiving layer adhesive sheet, for example, when used in a light transmission type signboard having a light source therein, unevenness may occur. If there is such an unevenness, since the unevenness can clearly be recognized by the light of the inside, there is a problem that the value of the product is damaged in these applications where the appearance is important. However, according to the laminated sheet of the present invention, by using the relaxed layer 11, it is possible to suppress the deformation and suppress the appearance of unevenness or the like.

Further, according to the winding roll of the present invention, it is not necessary to provide a stepped portion to the winding core, and since it is not necessary to install the elastic layer or the cover, the manufacturing process can be simplified. In addition, the stability of the operator is excellent. According to the present invention, since the step difference caused by the step derived from the start of winding of the laminated sheet is alleviated by the relaxed layer, the deformation of the adhesive sheet derived from the step can be suppressed and the yield of the adhesive sheet can be improved. And is particularly suitable for a winding roll for winding a sheet.

The above-described embodiment is one mode of the present invention, and other embodiments are also included in the scope of the present invention as long as the spirit of the present invention is satisfied.

≪ Embodiment >

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited thereto at all. All of the examples were carried out so as to obtain a winding roll in which a laminated sheet having a length of 100 m and a width of 1000 mm was wound.

Further, as a peelable film, a polyethylene terephthalate sheet having a thickness of 25 占 퐉 and having a peelable film (Y1 (light peeling force)) and Y2 (middle peel strength) Peel force), Y3 (middle peel force), Y4 (medium peel force)).

Example 1 Removal of Peelable Film (Y1) An acrylic pressure-sensitive adhesive was coated on the non-formed surface to form a pressure-sensitive adhesive layer 51 having a dry thickness of 15 占 퐉. A kraft paper 1 having a compressibility of 6.6% and a thickness of 75 탆 was abutted against the pressure-sensitive adhesive layer 51 as a cushion layer to obtain a relaxed layer (a1).

An acrylic pressure-sensitive adhesive was coated on the exfoliated surface of the releasable film (Y1) of the obtained relaxed layer (a1) to form a pressure-sensitive adhesive layer (61) having a dry thickness of 40 m. 1000 mm thick, 100 占 퐉 thick polyethylene terephthalate sheet (X1).

Separately, an acrylic pressure-sensitive adhesive was coated on the release-treated surface of the peelable film Y1 having a length of 200 m to form a pressure-sensitive adhesive layer 71 having a dry thickness of 40 占 퐉. The pressure-sensitive adhesive layer 71 was put in contact with the polyethylene terephthalate sheet X1 to obtain a laminated sheet (b1).

100 m of the obtained laminated sheet (b1) was coated with a polyethylene terephthalate film having a thickness of 5 占 퐉 in a plastic tube made of acrylonitrile-butadiene-styrene (ABS) resin having a width of 1050 mm, an inner diameter of 76.5 mm and an outer diameter of 92.5 mm A winding roll (c1) was obtained by winding the end portion of the laminated sheet while fixing the portion where the double-sided adhesive tape having the pressure-sensitive adhesive layer having a thickness of 5 占 퐉 as the core was stuck.

Table 2 shows the evaluation results concerning the peeling force between the adhesive sheet and the relaxed layer, the number of defective meters due to the stepped traces of the core material, and the unevenness of the entire surface.

Example 2 A kraft paper 2 having a total thickness of 95 탆 and a compressibility of 3.6% and having a thickness of 30 탆 laminated with a polyethylene resin on one side was used in place of the kraft paper 1, (C2) was obtained in the same manner as in Example 1, except that the rolls (51) were formed.

Example 3 A winding roll (c3) was obtained in the same manner as in Example 2 except that polyethylene terephthalate sheet (X2) having a thickness of 188 占 퐉 was used instead of polyethylene terephthalate (X1).

Example 4 A peelable film (Y2) was used in lieu of the peelable film (Y1), and a compression ratio of 3.1% and a total thickness of 65 mu m (C4) was obtained in the same manner as in Example 3, except that the crap paper 3 of Example 1 was used and the pressure-sensitive adhesive layer 51 was formed on the polyethylene resin non-laminate side of (3).

Example 5 A peelable film (Y2) was used in place of the peelable film (Y1), and in place of the kraft paper (1), the procedure was repeated except that the topsheet (4) having a compression rate of 2.6% A winding roll (c5) was obtained in the same manner as in Example 1.

Example 6 A winding roll (c6) was obtained in the same manner as in Example 5 except that a polyethylene terephthalate sheet (X3) having a thickness of 50 占 퐉 was used in place of the polyethylene terephthalate (X1).

Example 7 A peelable film (Y3) was used in place of the peelable film (Y1), and a polyethylene resin was laminated on both sides in place of the kraft paper (2) (5) having a total thickness of 95 mu m was used in place of the above-mentioned rolls (5), thereby obtaining a take-up roll (c7).

Example 8 A laminated film was obtained in the same manner as in Example 1 except that the peelable film (Y4) was used in place of the peelable film (Y3), and the topsheet (5) A winding roll (c8) was obtained in the same manner as in Example 7 except that the fibrous nonwoven fabric (6) was used.

Example 9 A wound roll (c9) was obtained in the same manner as in Example 8 except that a fibrous polyethylene terephthalate resin fiber nonwoven fabric 7 having a compression ratio of 11.1% and a thickness of 100 占 퐉 was used in place of the nonwoven fabric 6.

Example 10 The procedure of Example 1 was repeated except that the polyurethane resin foam 8 having a compressibility of 9.5% and a thickness of 100 탆 was used in place of the kraft paper 1 to form the pressure-sensitive adhesive layer 51 Thereby obtaining a winding roll (c10).

Example 11 The procedure of Example 3 was repeated except that the polyurethane resin gel 9 having a compression ratio of 12.4% and a total thickness of 100 占 퐉 was used in place of the kraft paper 2 and the pressure-sensitive adhesive layer 51 was formed Whereby a winding roll (c11) was obtained.

Example 12 Removal of Peelable Film (Y1) A pressure-sensitive adhesive layer (52) having an adhesive layer (52) having a dry thickness of 80 占 퐉 was coated on the non-formed surface with a polyvinyl chloride The phthalate sheet X4 was laminated to obtain a relaxed layer a12 having a compressibility of 1.8% and a total thickness of 111 mu m.

A winding roll (c12) was obtained in the same manner as in Example 3 except that the relaxed layer (a12) was used.

Example 13 An acrylic pressure-sensitive adhesive was applied to a side face of a polyethylene terephthalate sheet (X5) having a thickness of 25 占 퐉 to form a pressure-sensitive adhesive layer 51 having a dry thickness of 15 占 퐉. , A polyethylene resin having a thickness of 30 占 퐉 and a compression ratio of 2.2% and a total thickness of 130 占 퐉 were adhered together to obtain a relaxed layer (a13).

A polyethylene terephthalate sheet (X2) having a thickness of 188 占 퐉 was coated with an acrylic unbonded pressure-sensitive adhesive to form a pressure-sensitive adhesive layer (62) having a dry thickness of 15 占 퐉 and adhered to the obtained relaxation layer (a13).

Separately, an acrylic pressure-sensitive adhesive was coated on the release-treated surface of the peelable film Y1 to form a pressure-sensitive adhesive layer 71 having a dry thickness of 40 占 퐉. A winding roll (c13) was obtained in the same manner as in Example 1 except that the pressure-sensitive adhesive layer (71) was stuck to the polyethylene terephthalate sheet (X2) to obtain a laminated sheet (b13).

(Example 14) A laminate was prepared in the same manner as in Example 1 except that instead of the topsheet 10, a topsheet 11 having a compression ratio of 2.4% and a total thickness of 180 占 퐉 obtained by laminating a 30 占 퐉 thick polyethylene resin on both surfaces thereof was used and instead of the polyethylene terephthalate sheet Except that the polyethylene terephthalate sheet (X1) was used in place of the pressure-sensitive adhesive layer (71) having a dry thickness of 40 占 퐉, and a pressure-sensitive adhesive layer (72) To obtain a roll (c14).

Example 15 An acrylic pressure-sensitive adhesive was applied to a polyethylene terephthalate sheet (X2) to form a pressure-sensitive adhesive layer (62) having a dry thickness of 15 占 퐉. A compression ratio of 2.2% Layered with a thick paper 10 having a thickness of 130 mu m to obtain a relaxed layer a15.

Separately, an acrylic pressure-sensitive adhesive was coated on the release-treated surface of the peelable film Y1 to form a pressure-sensitive adhesive layer 71 having a dry thickness of 40 占 퐉. A winding roll (c15) was obtained in the same manner as in Example 1 except that the pressure-sensitive adhesive layer (71) was stuck to the polyethylene terephthalate sheet (X2) to obtain a laminated sheet (b15).

Example 16 Instead of the kraft paper 2, a polyethylene resin was laminated on both sides with a thickness of 30 占 퐉, and a topsheet 12 having a compression ratio of 2.2% and a total thickness of 130 占 퐉, which had been peeled off with a silicone resin on one side of the polyethylene resin layer, A winding roll (c16) was obtained in the same manner as in Example 3 except that the relaxed layer (a16) was used.

Example 17 Removal of Peelable Film Y1 An acrylic pressure-sensitive adhesive was applied to the non-formed surface to form a pressure-sensitive adhesive layer 53 having a dry thickness of 10 占 퐉. To the pressure-sensitive adhesive layer 53, a nonwoven fabric 6 ), A pulp fiber nonwoven fabric 14 having a compressive ratio of 10.9% and a total thickness of 32 탆 was abutted against each other to obtain a relaxed layer a17. A winding roll (c17) was obtained in the same manner as in Example 8 except that a polyethylene terephthalate sheet (X6) having a thickness of 250 占 퐉 was used instead of the polyethylene terephthalate sheet (X2).

COMPARATIVE EXAMPLE 1 A biaxially stretched polypropylene resin sheet 15 having a compressibility of 1.3% and a thickness of 60 탆 was used in place of the kraft paper 1 and a pressure-sensitive adhesive layer 51 was formed on the side of the biaxially stretched polypropylene resin sheet 15 A winding roll (c21) was obtained in the same manner as in Example 1.

Comparative Example 2 A polyethylene resin foam sheet 16 having a compression ratio of 28.5% and a thickness of 105 占 퐉 was used in place of the biaxially stretched polypropylene resin sheet 15 and the pressure-sensitive adhesive layer 51 was formed on the one- Was carried out in the same manner as in Comparative Example 1 to obtain a take-up roll (c22).

COMPARATIVE EXAMPLE 3 Except that the releasable film was not used and the releasable film of the releasable film (Y1) was adhered to the surface of the pressure-sensitive adhesive layer (61) not in contact with the polyethylene terephthalate sheet (X1) 1, a winding roll (c23) was obtained.

(Comparative Example 4) A polyethylene terephthalate sheet having a thickness of 25 占 퐉 was used in place of the peelable film (Y1), and a peelable film (Y5) obtained by peeling treatment with an alkyd resin was used on one side of the polyethylene terephthalate sheet. And a roll (c24) was obtained.

The rolls obtained in Examples 1 to 17 and Comparative Examples 1 to 4 were evaluated for the following items.

≪ Peeling force > The laminated sheet was wound from the obtained winding roll to prepare a sample having a width of 25 mm and a length of 100 mm. The relaxed layer of the sample was fixed to a stainless steel plate having a thickness of 2 mm, a width of 30 mm, and a length of 110 mm with double-sided tape. The peeling strength of the sample adhesive tape was measured at a peel angle of 180 DEG C and a peel rate of 300 mm. The peel strength was measured in an atmosphere of 23 ° C-50% RH in accordance with JIS Z-0237.

≪ Compression ratio > The method of measuring the compression ratio is shown in Fig. The relaxed layer was cut into a circular disk having a diameter of 22.4 mm on the sample support 9, and 10 pieces of the relaxed layer were stacked as a measurement sample (2). The first load 4 and the second load 5 are fixed to the circumference 3 having a diameter of 5 mm by a fall prevention stopper formed on the circumference 3, respectively. The first load 4 is a load control unit 6 and the second load 5 is prepared in a state in which a load is not applied to the circumference 3 by using the load control unit 7.

The compression rate is measured by taking the load control section 6 and applying the first load 4 to the circumference 3 with the lower end of the circumference 3 in contact with the measurement specimen 2 (load: 300 g / cm & ). And the thickness (T1) of the measurement sample after one minute is measured. Next, the load control unit 7 is taken one minute after the first load is applied, and the second load 5 is applied to the circumference 3 (load: 1500 g / cm2). Measure the thickness (T2) of the test sample one minute after applying the second load. T1 and T2 were measured from the position variation 8 at the top of the circumference 3 at each measuring time using the laser displacement gauge 1 provided above the circumference. The compression ratio was obtained by the following equation (1).

Expression (1) Compression rate (%) = (T1-T2) / T1 × 100

≪ Yield > The laminated sheet is started to be wound from the obtained winding roll, and a laminated sheet of 100 cm square is cut every 1 m from the end where the core is wound. The relaxed layer is peeled off from this sample, and the yield from the end where the deformation can be confirmed on the pressure-sensitive adhesive sheet is determined as yield. This yield evaluation is better as the numerical value is smaller.

≪ Visibility > The laminated sheet is rolled 10 m from the obtained winding roll and cut out 100 cm in all directions to obtain a sample. The relaxed layer was peeled off from the specimen, and a laminate adhered to a 2 mm thick PMMA plate (acrylic plate) was evaluated by evaluating whether or not unevenness occurred in the specimen by irradiating light from a bulb provided behind the laminate. The evaluation criteria are as follows.

O: There is no stain on the laminate.

B: Laminates slightly stained.

X: There is a stain on the laminate. Not practicable.

This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2012-228020, filed on October 15, 2012, including all such expressions herein.

(Industrial availability)

The wind-up roll of the present invention can be suitably used in all fields using a wind-up roll in which the pressure-sensitive adhesive sheet is wound around the core. And is particularly suitable for a winding roll in which a long sheet is wound around a core.

10: laminated sheet
11: Relaxation layer
12: Cushion layer
13: Release layer
21: Pressure sensitive adhesive sheet
22: pressure-sensitive adhesive layer
23: substrate film
24: Release layer
30: Winding roll
31: Coil core

Claims (5)

A winding roll comprising a laminated sheet wound around a core material,
Wherein the laminated sheet includes a pressure sensitive adhesive sheet and a relaxed layer laminated so as to be in contact with the pressure sensitive adhesive sheet,
Wherein the pressure-sensitive adhesive sheet comprises a base film and a pressure-sensitive adhesive layer,
Wherein the peeling force between the adhesive sheet and the relaxed layer is 0.02 to 2 N / 25 mm,
The relaxed layer has a layer having a compressibility of 1.5 to 15%
Wherein the relaxation layer is any one of paper, a foam, a nonwoven fabric and an elastic gel.
The method according to claim 1,
Wherein a leading end portion of the laminated sheet is fixed by the winding core and the adhesive member.
3. The method according to claim 1 or 2,
Wherein the relaxed layer comprises a release layer and a cushion layer,
Wherein the cushion layer has a compressibility of 1.5 to 15%.
3. The method according to claim 1 or 2,
Wherein the thickness (A) of the pressure-sensitive adhesive sheet and the thickness (B) of the relaxation layer are (A) / (B) = 0.5 to 10.
3. The method according to claim 1 or 2,
Wherein the laminated sheet is wound with the relaxed layer on the winding core member side.

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