JPH11184379A - Manufacture of pseud adhesive sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the quality as a recording sheet from being spoiled when the sheet is machined into a pseud adhesive sheet by guiding the sheet to a nip part which has the recording sheet at its surface base material and consists of a cooling roll and a pressing roll so that the recording surface of the recording sheet is on the side of the pressing roll. SOLUTION: The pseud adhesive sheet 20 is formed by fusing a thermoplastic resin at a temperature which is 10 to 50 deg.C lower than normal lamination process temperature, extruding it to between the surface base material 18 and an intermediate base material 19 nipped between the nip of a cooling roll 12 and a pressing roll by the T die 14 of an extruder, and laminating and pressing it with both the base material simultaneously with cooling. Specially, the recording surface of the recording sheet is guided to the nips in contact with the pressing roll 14. As the intermediate base material 19, films of paper base materials such as craft paper, laminate paper formed by laminating polyethylene, etc., thereupon, etc., are used. The thermoplastic resin in use is obtained by mixing thermoplastic resin such as a polyolefin-based polymer, etc., of polyethylene etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a quasi-adhesive sheet obtained by quasi-adhering two kinds of base materials with a thermoplastic resin, and more particularly, to a tag, a delivery slip, and a process used for logistics management by applying an adhesive treatment to the back surface. The present invention relates to a pseudo adhesive sheet suitable as a display label used for management.

[0002]

2. Description of the Related Art Conventionally, a transportation company such as a department store, mail order, or courier service stacks a plurality of pressure-sensitive copying paper (eg, carbonless paper) for distribution management such as ordering, shipping, and receiving customers. A slip having a shape in which the lowermost layer is an adhesive sheet is used. When writing information such as a product name, a sender, and a destination on such a slip, it is necessary to apply strong pressure. Further, since pressure-sensitive copying paper is used, if a strong impact is applied during the distribution process, the color may be generated and the written information may be difficult to read. Furthermore, since a plurality of sheets of paper are stacked with a part of the sheets adhered, the sheets may be torn or peeled off during the distribution process.

In order to solve such a problem, in recent years,
A surface substrate, a thermoplastic resin layer composed of one or two layers, an intermediate substrate composed of a paper substrate or a film, an adhesive layer and a release substrate are laminated in this order, and the surface substrate and the thermoplastic resin layer are laminated. A method using a pressure-sensitive adhesive sheet (FIG. 1) which has been pseudo-adhered so as to be peelable at either the intermediate layer or between the thermoplastic resin layer and the intermediate substrate has been devised. The method of using the pseudo-adhesive pressure-sensitive adhesive sheet for a tag or the like is described in JP-B-55-1.
No. 5035 discloses this.

According to the disclosure of this publication, one or several kinds selected from thermoplastic resins such as polyethylene and polypropylene are melted at a temperature lower than a normal lamination processing temperature, extruded from a T-die of an extruder, paper, etc. Producing a pseudo-adhesive sheet by solidifying and cooling with the base material of
The pseudo-adhesive sheet can be obtained by subjecting the pseudo-adhesive sheet to an adhesive process.

[0005]

However, when a recording sheet such as a heat-sensitive recording sheet, a thermal transfer receiving sheet, or an ink jet recording sheet is used as the surface base material of such a pseudo-adhesive pressure-sensitive adhesive sheet, recording may be performed depending on the production method. It has been found that there is a problem that the image quality is deteriorated, and the recording surface is markedly impaired in quality, such as unevenness.

The present invention has improved the point that the quality of a recording sheet when processed into a pseudo adhesive sheet is not impaired.
An object of the present invention is to provide a pseudo-adhesive sheet suitable for a tag or a delivery slip used for physical distribution management and a display label used for process management.

[0007]

[Means to solve the problem]

The present invention relates to a method for extruding a thermoplastic resin between a surface base material and an intermediate base material and cooling and pressing the same with a cooling roll and a pressure roll to form a thermoplastic resin between the surface base material and the thermoplastic resin layer. In a pseudo-adhesive sheet that can be peeled off between a plastic resin layer and an intermediate substrate, the surface substrate is a recording sheet, and the recording surface of the recording sheet is placed on a nip constituted by a cooling roll and a pressure roll. This is a method for producing a pseudo-adhesive sheet in which the intermediate base material is guided to the cooling roll side, and the surface base material and the intermediate base material are pressure-bonded and laminated at the nip with a thermoplastic resin extruded from a T-die.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In general, a pseudo-adhesive sheet is prepared by subjecting a thermoplastic resin to a normal lamination temperature of 10 to 50 ° C.
Melt at a low temperature and extrude the molten thermoplastic resin from the T-die of the extruder between the surface substrate and the intermediate substrate sandwiched between the nip of the cooling roll and the pressure roll, and simultaneously cool both substrates It is obtained by laminating and pressing (FIG. 2). The present invention is characterized in that the recording sheet is guided to the nip so that the recording surface of the recording sheet comes into contact with the pressure roll. By the way, when the recording sheet is guided to the cooling roll side, the water adhering to the cooling roll becomes a recording layer,
Perhaps because the recording sheet is partially sucked into the support or the like, unevenness or the like occurs, and the recording image quality and the like also deteriorate.

Examples of the surface substrate used in the present invention include papers such as high-quality paper, medium-quality paper, coated paper, art paper, kraft paper, special papers such as aluminum-deposited paper, resin-impregnated paper, and synthetic paper.
On the surface of a support such as a film such as PET, polyvinyl chloride, or polyolefin, or a laminated support obtained by further laminating them by means such as dry lamination, a heat transfer recording receiving layer, a thermosensitive recording layer, an ink jet recording layer, etc. A recording sheet having a recording layer is used. The recording layer is not particularly limited, and a known recording layer can be employed. Above all, it is preferable to use recording sheets that can be recorded by various printers, and particularly heat-sensitive recording sheets are preferable because they are suitable for outputting slips and the like. The thickness of the surface substrate is not particularly limited, but is approximately 20 to 150 μm.

Examples of the intermediate substrate used in the present invention include paper substrates such as high-quality paper, kraft paper, glassine paper, and parchment paper; laminated paper obtained by further laminating polyethylene or the like; PET or polyvinylidene chloride; Films such as polypropylene are used, but are not limited thereto. The thickness of the intermediate layer is usually 1
It is about 5 to 150 μm, preferably about 20 to 100 μm.

As the material of the pressure roll, a normal rubber roll or silicone rubber roll is preferably used. Above all, the hardness of the pressure roll measured by a rubber hardness test method (JIS A, hereinafter simply referred to as JIS A method) specified in JIS K 6301 is 55 to 85 degrees, preferably 60 to 80 degrees. This is particularly preferred because the surface of the recording layer is not damaged, and in the case of a heat-sensitive recording sheet, background fogging hardly occurs. In addition, when the hardness of the roll is higher than 85 degrees, the recording surface of the surface base material may have a scratch or a background fog in the case of a heat-sensitive recording sheet, and when the hardness of the roll is lower than 55 degrees, Even if the pressure at the time of press bonding is sufficiently applied, problems such as difficulty in controlling the peeling force such as the pseudo-bonded portion being lower than the desired peeling force and inferior roll durability may occur. The roll diameter is not particularly limited. The pressure roll preferably has an external or internal cooling means so as not to be heated during the production. For example, it is preferable to provide a cooling roll different from that for lamination so as to be in contact with the pressure roll.

As the thermoplastic resin used in the present invention, a thermoplastic resin such as a polyolefin-based polymer or copolymer such as polyethylene and polypropylene, and a thermoplastic resin such as polystyrene, vinyl acetate copolymer and ethylene-vinyl acetate copolymer can be used. A mixture of species or a mixture of several species is used, but is not limited to these, and any thermoplastic resin can be used as long as a pseudo-adhesion effect can be obtained. Further, the thickness of the thermoplastic resin layer is not particularly limited, but is usually 5-6.
0 μm, preferably about 10 to 50 μm. In addition,
Thermoplastic resin is 1 less than normal lamination temperature.
At a temperature of 0 to 50 ° C lower, for example, at 250 to 320 ° C in the case of polyethylene resin, from the T-die of the extruder, between the surface substrate and the intermediate substrate sandwiched between the cooling roll and the pressure roll. The molten thermoplastic resin is extruded.

When the pseudo adhesive sheet is prepared under such conditions, it is possible to peel off the sheet between the surface base material and the thermoplastic resin layer or between the thermoplastic resin layer. The peeling is determined by the adhesion between the thermoplastic resin and the two substrates. For example,
One of the base materials is a paper base material, and the other base material is a resin (for example, polyethylene and polypropylene) having a high compatibility with the thermoplastic resin having the same type or a very similar composition and structure. In this case, peeling can be performed between the thermoplastic resins. When one of the base materials is a paper base material and the other base material is a base material made of a resin having a small compatibility with the thermoplastic resin, the separation between the resin base material and the thermoplastic resin layer becomes possible. . In addition, even if both base materials are paper base materials, one of the paper base materials is a high-quality paper or kraft paper, or a relatively low-smoothness paper base material such as an uncoated portion on the back of the thermal recording sheet, and the other is glassine paper. In the case of a highly smooth paper substrate such as that described above, peeling between the highly smooth paper substrate and the thermoplastic resin layer becomes possible. In order to enable stable peeling, it is preferable to previously laminate a thermoplastic resin on one of the surface substrate and the intermediate substrate. The lamination is preferably performed at a temperature higher than the resin temperature of the pseudo bonding, for example, about 330 to 360 ° C. in the case of polyethylene, and it is more preferable to perform a corona discharge treatment on the back surface of the laminating station immediately before the lamination processing.

Known adhesives such as acrylic adhesives, natural rubber-based adhesives, synthetic rubber-based adhesives, and silicone-based adhesives can be used as the adhesive used in the adhesive processing. It is not limited. The thickness of the pressure-sensitive adhesive layer is not particularly limited, but is usually 5 to 60 μm, preferably about 10 to 40 μm.

Examples of the base material of the release sheet include paper base materials such as ordinary high-quality paper, kraft paper and glassine paper, base materials obtained by subjecting these paper base materials to a lamination treatment such as polyethylene, PET and polypropylene. These substrates are formed by applying a release treatment such as silicone to the side of the substrate in contact with the pressure-sensitive adhesive layer. Although the thickness of the release sheet is not particularly limited, it is 20 to 15
0 μm, and preferably about 40 to 100 μm.

The present invention will be described in more detail with reference to the following Examples, but it should be understood that the present invention is by no means restricted thereto.

Example 1 A polyethylene resin (trade name: Mirason 16P, manufactured by Mitsui Petrochemical Industry Co., Ltd.) was placed on a T-die on the opposite side of the heat-sensitive recording layer of a heat-sensitive recording paper (thickness: 80 μm) having a size of 78 g / m ^{2 by} the US. Then, the resin temperature was set to 350 ° C., the nip pressure between the cooling roll and the pressure roll was set to 5 kg / cm ² by the extrusion lamination method, the lamination pressure was set to 10 μm, and the thermal recording paper and the polyethylene resin were not re-peeled. Was firmly laminated (pre-lamination) to obtain a surface substrate.

Next, a polyethylene resin (trade name: Mirason 16P, manufactured by Mitsui Petrochemical Co., Ltd.) was applied to a parchment paper (thickness: 25 μm) of 30 g / m ² by a T-die and extrusion lamination. Resin temperature 300 ℃,
The nip pressure of the cooling roll and the pressure roll is set to 1 kg / cm ² , and the lamination pressure is set to 10 μm. At the same time, the polyethylene resin layer side of the pre-laminated surface base material is changed to a polyethylene resin layer. In addition, a cooling roll and a pressure-bonding roll were bonded so that the surface substrate was in contact with the pressure-bonding roll, to obtain a pseudo-adhesive sheet that could be peeled off between the intermediate layer (parchment paper) and the polyethylene layer.
The pressure roll used for the pressure bonding was made of silicone rubber having a hardness of 80 degrees as measured by the JIS A method. Then, an acrylic pressure-sensitive adhesive was applied to the resin layer side of the obtained pseudo-adhesive sheet so as to have a thickness of 15 μm, and then a silicone release-treated glassine paper of 64 g / m ² (60 μm in thickness) of rice tsubo was applied. The pseudo-adhesive pressure-sensitive adhesive sheet was obtained by laminating so that the release treated surface was in contact with the pressure-sensitive adhesive layer.

Example 2 Pseudo-adhesive adhesion was carried out in the same manner as in Example 1 except that the pressing roll used for the pressing was made of silicone rubber having a hardness of 60 degrees as measured by JIS A method. I got a sheet.

Example 3 Pseudo-adhesive adhesion was carried out in the same manner as in Example 1 except that a chloroprene rubber having a hardness of 90 degrees as measured by JIS A was used as a pressure roll used for pressure bonding. I got a sheet.

Example 4 Pseudo-adhesive adhesion was carried out in the same manner as in Example 1 except that the pressing roll used for pressing was made of silicone rubber having a hardness of 50 degrees as measured by JIS A method. I got a sheet.

Comparative Example 1 The same procedure as in Example 1 was carried out except that the surface substrate was brought into contact with the cooling roll when the surface substrate and the intermediate layer were pressed by the cooling roller and the pressure roller during the simulated processing. A pseudo-adhesive pressure-sensitive adhesive sheet was obtained.

Comparative Example 2 The same procedure as in Example 2 was carried out except that the surface base material was in contact with the cooling roll side when the surface base material and the intermediate layer were pressed by the cooling roll and the pressure bonding roll during the dummy processing. A pseudo-adhesive pressure-sensitive adhesive sheet was obtained.

Comparative Example 3 The same procedure as in Example 3 was carried out except that the surface substrate was brought into contact with the cooling roll when the surface substrate and the intermediate layer were pressure-bonded by the cooling roller and the pressure roller during the dummy processing. A pseudo-adhesive pressure-sensitive adhesive sheet was obtained.

Comparative Example 4 The same procedure as in Example 4 was carried out except that the surface substrate was brought into contact with the cooling roll when the surface substrate and the intermediate layer were pressure-bonded by the cooling roller and the pressure roller during the dummy processing. A pseudo-adhesive pressure-sensitive adhesive sheet was obtained.

The surface adhesion of the pseudo adhesive pressure-sensitive adhesive sheet obtained in this manner, such as unevenness and scratches, background fogging, the controllability of the pseudo-adhesion part peeling force of the pseudo-adhesion part during production, the quality of these and the workability during production, etc. The overall evaluation was based on the following criteria.

(Evaluation Criteria) "Bumpy" ：: No bleeding X: There is ragging "Scratch" ：: No scratching x: There is a scratch "Background fogging" ○: No background fogging x: There is a background fogging Peeling force controllability of pseudo-adhesion part "○: Easy to control △: Somewhat difficult to control ×: Hard to control" Comprehensive evaluation "◎: Very good ○: Good △: Somewhat poor ×: Poor

[0029]

[Table 1]

As is clear from the table, the appearance of unevenness and the like can be improved by optimizing the height of the pressure-bonding roll at the time of performing the pseudo-adhesion processing and by making the recording surface of the surface substrate contact with the pressure-bonding roll side. An excellent pseudo-adhesive sheet with improved scratches and background fogging, which can cause misreading or difficulty reading information when used on a tag or slip, can be obtained.

[0031]

According to the pseudo adhesive sheet of the present invention, when a type in which a plurality of pressure-sensitive copying papers are laminated is used, it is necessary to apply a strong pressure when writing information, There are no drawbacks, such as coloring and making the written information difficult to read, and multiple sheets of paper may be torn or peeled off during the distribution process due to the lamination of multiple sheets, and the recording sheet on the surface has bumps, scratches, background fogging, etc. It can be said that it is a pseudo-adhesive sheet suitable for tags and delivery slips used for physical distribution management and display labels used for process management.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a pseudo-adhesive pressure-sensitive adhesive sheet.

FIG. 2 is a process diagram illustrating a process for producing a pseudo-adhesive sheet of the present invention.

[Explanation of symbols]

 1: pseudo adhesive sheet 2: surface substrate (recording sheet) 3: intermediate substrate 4: thermoplastic resin 5: support 6: recording layer 11: manufacturing process of pseudo adhesive sheet 12: cooling roll 13: pressure roll 14: T die 15: Unwinder 16: Unwinder 17: Winder 18: Surface substrate (recording sheet) 19: Intermediate substrate 20: Pseudo-adhesive sheet 21: Cooling means

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI // B29C 65/76 B29C 65/76

Claims (5)

[Claims] 1. A method for extruding a thermoplastic resin between a surface substrate and an intermediate substrate, and cooling and pressing the thermoplastic resin with a cooling roll and a pressure roll, between the surface substrate and the thermoplastic resin layer or the thermoplastic resin. In the pseudo adhesive sheet that can be peeled between the layer and the intermediate substrate, the surface substrate is a recording sheet,
Guided to the nip constituted by the cooling roll and the pressure roll, so that the recording surface of the recording sheet is on the pressure roll side,
A method for producing a pseudo-adhesive sheet in which an intermediate base material is guided to a cooling roll side, and a surface base material and an intermediate base material are pressure-bonded and laminated at the nip with a thermoplastic resin extruded from a T-die. 2. A thermoplastic resin extruded from a T-die,
The method for producing a pseudo-adhesive sheet according to claim 1, wherein the pseudo-adhesive sheet is polyethylene having a temperature of 250 to 320 ° C. 3. The method for producing a pseudo-adhesive sheet according to claim 1, wherein a sheet having a surface laminated with polyethylene at a temperature of 330 ° C. or more is used as the intermediate substrate. 4. The method for producing a pseudo adhesive sheet according to claim 1, wherein the recording sheet is a thermosensitive recording sheet. 5. The pressure roll according to claim 1, wherein the hardness of the pressure roll measured by a hardness test method (JIS A) specified in JIS K 6301 is 55 to 85 degrees. A method for producing a pseudo adhesive sheet.