JPH0711208A - Production of printed tacky adhesive tape - Google Patents

Abstract

PURPOSE:To obtain the subject tape free from the deformation of printed pattern by printing a releasing sheet having poor stretchability, winding and laminating the printed sheet, passing the obtained substrate sheet together with a tacky adhesive sheet through a transfer apparatus to transfer the tacky adhesive layer and removing the releasing sheet. CONSTITUTION:A 1st releasing sheet web 1 made of a material having poor stretchability and having a release-treated face on at least one surface is printed with a gravure printer 2 on its release-treated surface, dried with an infrared lamp 4, coated with an over-coating agent by a coater 3 and wound to obtain a wound roll 5 of a releasing sheet. A resin film for forming a tape substrate and extruded through a T-die 13 of an extruder 12 is laminated to the printed layer side of the sheet with a laminator 11, the obtained printed substrate sheet 15 is laminated with a 2nd releasing sheet 22 having a release-treated surface on one surface and a tacky adhesive layer on the other surface and the laminate is passed through a transfer apparatus 18 to transfer the tacky adhesive layer to the substrate side of the substrate sheet 15. The 1st releasing sheet 1 is removed from the obtained laminated sheet to obtain the objective tacky adhesive tape.

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 a printed pressure-sensitive adhesive tape which is made of a resin film having a high elasticity.

[0002]

2. Description of the Related Art Conventionally, a resin film made of a synthetic resin such as a soft vinyl chloride resin or an olefinic soft resin has a characteristic of being highly stretchable, and such a resin film is used as a base material. The adhesive tape is widely used as a patch product such as a plaster or a tape for can sealing. In recent years, printing has also been frequently performed on these adhesives, adhesive tapes and the like.

By the way, as a method of manufacturing a printed adhesive tape using such a highly stretchable resin film as a base material, conventionally, a manufacturing process as shown in FIG. 4 has generally been performed. . That is, first, while winding the belt-shaped resin film roll a, the printing is performed on one surface of the film by using a printing machine such as a gravure printing machine b, and the printed roll of the base sheet c is once printed. d is manufactured.

Next, while rewinding the base sheet c from the roll d, on the other hand, from the roll f of the pressure-sensitive adhesive sheet e having the pressure-sensitive adhesive layer temporarily attached to one surface of the release sheet, to the pressure-sensitive adhesive sheet e. While rewinding the sheet, the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet e and the other surface (the surface without the printing layer) of the pressure-sensitive adhesive sheet e are sent to the transfer roll g so as to be in contact with each other, thereby pressing the pressure-sensitive adhesive layer.
The step of obtaining a printed adhesive tape t having a laminated structure of release sheet h / adhesive layer i / base material sheet c / printing layer j as shown in (a) is performed. In this state, the pressure-sensitive adhesive layer i is in the form of being transferred to the other surface side of the base material c.

[0005]

However, during the manufacturing process of the adhesive tape t as shown in FIG. 4, since the base material sheet c is rich in elasticity, the tension in the manufacturing process causes After the base material c is elongated in the longitudinal direction and has passed through the printing machine b, it receives thermal energy for drying the printing ink. Therefore, when the pressure-sensitive adhesive tape t is manufactured by transferring it to the pressure-sensitive adhesive sheet e and cut to a fixed length to form, for example, a pasted product, the base material sheet c shrinks in a relatively short time. The state shown in FIG.

As a result, the adhesive layer i is exposed at both edges of the adhesive tape t (both edges in the traveling direction at the time of processing), not only the appearance is deteriorated, but also the printed pattern shrinks following this. In the printing stage, it is necessary to prepare the plate cylinder in anticipation of the shrinkage allowance in advance, and there is a problem in that proper printing itself is difficult.

The present invention solves the above-mentioned drawbacks of the prior art and prevents the adhesive layer from being exposed with time even when the tape base material is made of a resin film having high elasticity. , It is easy to show suitable printing pattern,
The present invention has been made for the purpose of providing a method for producing a pressure-sensitive adhesive tape which is printed and has excellent appearance quality.

[0008]

According to the present invention, "a first release sheet, which is made of a material having a band shape and poor stretchability, at least one surface of which is subjected to a release treatment, is printed on the release-treated surface. Then, a resin film serving as a tape base material is laminated on the printed layer side to form a printed belt-shaped base material sheet, while one side of the second release sheet which has been subjected to a release treatment. A belt-shaped pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer on its surface is formed, and while the base material sheet and the pressure-sensitive adhesive sheet are continuously transferred toward a transfer roll, the base material surface of the base material sheet is a pressure-sensitive adhesive sheet. The method is for producing a pressure-sensitive adhesive tape that has been printed, which is characterized in that the first release sheet is removed from the obtained laminated sheet by feeding and pressing so as to contact the layer.

That is, in the printing step, when printing is performed on the first release sheet made of a material having poor elasticity to avoid direct printing on the tape substrate, and thus printing on the substrate having high elasticity. Printing on the base sheet is achieved by laminating a resin film on the printed layer to form a printed base sheet, and the transfer method is used. After forming the pressure-sensitive adhesive layer, the second release sheet that became the carrier during this transfer was used as it was as the original release sheet, and the unnecessary first release sheet was printed on the release treated surface. Therefore, the main point is that the purpose is achieved by removing it from the interface with the printing layer.

The material having poor stretchability which constitutes the first release sheet in the present invention is used as a base material for paper or nonwoven fabric, metal vapor deposition sheet or other adhesive tape, and is mainly used for mechanical external force or Any strip-shaped material that is difficult to be stretched by heat energy can be used, but it is necessary to remove this in the final step of manufacturing, so at least one surface (the surface that contacts the printing layer) must be stripped. Must be applied. Further, not only is it poor in elasticity, but mechanical strength such as tensile strength is also required in the manufacturing process to some extent, so in the case of paper such as kraft paper and high-quality paper, for example, synthetic resin film is laminated. It is preferable to use a composite sheet. Further, the first release sheet may be used repeatedly.

There is no particular limitation on the release agent and its application method when the release treatment is applied to the first release sheet and the second release sheet, and the release agent and its application method used in the production of pressure-sensitive adhesive tapes. All of can be adopted. Specifically, a mixture of multiple types of resin is used, such as a case where a resin having excellent release performance such as a silicone resin is used alone, and a mixture of a vinyl chloride-vinyl acetate copolymer resin and an acrylic resin. When doing so.

Further, the printing means to be applied to the release-treated surface of the first release sheet is not particularly limited, and any printing ink, printing method or the like adopted in the production of an adhesive tape can be adopted. As the printing ink, either one-liquid type or cross-linking type is used.
After printing, it is optional to apply a transparent overcoat such as a varnish on the printed layer.

The resin film used as the tape substrate is
Examples of the resin include olefin resins such as polyethylene and polypropylene, thermoplastic resins such as soft vinyl chloride resin, and foamed films of these resins. The extruder may be equipped with a T-die to be extruded into a thin film and laminated. .
The size is 10-25 depending on the application.
The width is 0 μm and the width is about 300 to 1500 mm.

In the step of laminating the resin film on the printed layer side of the printed first release sheet to form the printed base sheet, the film temperature of the resin film at the time of lamination It is preferable that the temperature is 100 ° C. or higher. If the temperature is lower than this range, the adhesion to the print layer may deteriorate.

In the production method of the present invention, if the steps are subdivided ,. The first release sheet manufacturing process ,. Printing step of the first release sheet ,. A step of forming a printed substrate sheet by laminating a resin film on the printing layer side of the first release sheet ,. A step of applying an adhesive to the second release sheet to form an adhesive sheet ,. A step of transferring the pressure-sensitive adhesive layer by pressing the pressure-sensitive adhesive sheet and the base material sheet ,. It can be divided into the steps of removing the first release sheet. The steps and and may be directly connected in some cases, but the other steps are usually different steps because the line speeds are different. However, if the conditions are adjusted, it is possible to make all the processes in-line.

[0016]

In the production method of the present invention, the first release sheet, which is made of a material having a band-like shape and poor stretchability, and at least one surface of which is release-treated, is printed on the release-treated surface,
Next, a resin film serving as a tape base material is laminated on the printing layer side so that a strip-shaped base material sheet printed is used. Therefore, the base material sheet does not participate in the printing process and the base material sheet expands and contracts. Even if the material is rich in properties, it does not receive external force due to the severe processing conditions in the printing process.

The first release sheet which is no longer needed is
Since it is printed on the release-treated surface, it can be easily removed from the interface with the printed layer in the laminated sheet.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic explanatory view of an apparatus suitable for carrying out the manufacturing method of the present invention. In the figure, reference numeral 1 is a first release sheet, one surface (lower surface in the drawing) of which is subjected to a release treatment. 2 is a gravure printing machine, and 3 is an overcoat applicator. 4 and 4 are infrared lamps that serve as dryers for the applied printing ink and overcoating agent.

Reference numeral 5 denotes a printed roll of the first release sheet. Then, a cross-sectional view taken along the line EE in FIG. 1 is shown in FIG. This is a cross-sectional view of the printed first release sheet. The first release sheet 1 has a laminated structure in which a paper tape 6 / a laminated thin film 7 of polyethylene resin / a release agent layer 8 are formed. Reference numeral 9 is a printing layer, and 10 is an overcoat layer.

The wound body 5 thus obtained is shown in FIG.
As shown in (1), the process proceeds to the next laminating step, that is, the step of laminating the resin film on the first release sheet 1 to form a printed base sheet. Reference numeral 11 denotes a laminating machine, which extrudes a molten soft synthetic resin into a film from a T-die 13 attached below the extruder 12,
The resin is fused onto the printing layer 9 through the overcoat layer 10 at a stage where the resin is not yet solidified. This overcoat layer 10
Has a function of enhancing the adhesion between the printed layer 9 and the base material 16.

FIG. 2 is a sectional view taken along the line Loro of FIG.
Shown in (b). The printed substrate sheet 15 thus obtained has a laminated structure of the first release sheet 1 / printing layer 9 / overcoat layer 10 / substrate 16.

Next, as shown in FIG. 1, the roll 17 of the printed substrate sheet 15 thus obtained is printed.
In the next transfer step, that is, the adhesive sheet and the base sheet 15
The step of transferring the pressure-sensitive adhesive layer is performed by pressing and. Reference numeral 18 denotes a transfer device having a metal roll 19 and a pressure roll 20, which rewinds the roll 17 of the base material sheet, while at the same time, a peeling treatment is applied to one surface, which is manufactured in a separate process. The pressure-sensitive adhesive sheet 22 is rewound from the pressure-sensitive adhesive sheet roll 21 having the pressure-sensitive adhesive layer provided on the other surface of the second release sheet.

The structure of the adhesive sheet 22 is shown in FIG.
A cross-sectional view taken along the line C is shown in FIG. 23 is an adhesive layer, 24 is a paper tape, 25 is a release agent layer, and 26 is a second release sheet.

Then, the base material 16 of the base material sheet 15 and the pressure-sensitive adhesive layer 23 of the pressure-sensitive adhesive sheet 22 are sent to the transfer device 18 so as to overlap each other, and the pressure-sensitive adhesive layer 23 is transferred to the base material 16. The obtained laminated sheet 27 has a first release sheet 1 / printing layer 9 / overcoat layer 10 / base material 16 as shown in a sectional view of FIG. / Adhesive layer 23 / Second release sheet 26 has a laminated structure.

In the present embodiment, the work of removing the first release sheet 1 is performed as a separate process as the last process. However, as described above, this work is carried out inline directly after the transfer process. Good.

The thus-printed pressure-sensitive adhesive tape thus obtained has a structure as shown in FIG. 3, and the sample (width of laminated sheet = 800 mm) was
Evaluation of the degree of shrinkage of the substrate sheet, the adhesion of the printing layer, the peelability of the release sheet, etc., after one week has passed from the production of the adhesive tape obtained by the conventional method of directly printing on the substrate sheet. As a result of comparison with the sample, no problems were observed in the adhesion of the printed layer and the peelability of the release sheet in both the examples and the comparative examples, but the shrinkage of the base sheet was determined in this example. In contrast, in the case of No. 1, it was about 0 to 0.1 mm, whereas in the conventional method, the contraction was from 2 to 3 mm from the left and right edges.

[0027]

EFFECTS OF THE INVENTION The production method of the present invention comprises printing on the release-treated surface of a first release sheet made of a material having a band-like shape and poor stretchability, and at least one surface of which is subjected to a release treatment. Since a strip-shaped base sheet printed by laminating a resin film as a tape base on the printing layer side is used, the base sheet does not participate in the printing process, and the base sheet is elastic. Even if it is a rich material,
No external force is applied due to the severe processing conditions in the printing process.

The first release sheet that is no longer needed is
Since the print layer is provided on the release-treated surface, it can be easily removed from the interface with the print layer in the laminated sheet.

In general, the printing process is easy and there is no need to make special adjustments to the plate cylinder, etc., and the manufacturing cost can be reduced. In addition, a product having an excellent appearance quality can be obtained, and the occurrence rate of defective products can be suppressed, so that the production efficiency is improved.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of an apparatus suitable for carrying out a manufacturing method of the present invention.

FIG. 2 is a cross-sectional view showing the structure of the sheet at each stage of each manufacturing process when the manufacturing apparatus described above is used.

FIG. 3 is a cross-sectional view showing a structure of an adhesive tape obtained by using the same device.

FIG. 4 is a schematic explanatory view of an apparatus used for carrying out a conventional manufacturing method.

5A and 5B are cross-sectional views of an adhesive tape obtained by a conventional manufacturing method, in which FIG. 5A is a cross-sectional view immediately after manufacturing, and FIG. 5B is a cross-sectional view after a certain period of time. .

[Explanation of symbols]

1 First release sheet 5 Rolled body of the first release sheet with print 6, 24 Paper tape 7 Laminated thin film 8, 25 Release agent layer 9 Printing layer 10 Overcoat layer 11 Laminating machine 12 Extruder 13 T-die 14 Laminating roll 15 Printed base material sheet 16 Base material 17 Printed base material sheet roll 18 Transfer device 21 Adhesive sheet roll 22 Adhesive sheet 23 Adhesive layer 26 Second release sheet 27 Lamination Sheet

Claims (1)

[Claims] 1. A first release sheet, which is made of a material having a band-like shape and poor stretchability, and at least one surface of which is subjected to a release treatment, is printed on the release-treated surface, and then on the print layer side. Laminated resin film to be a tape substrate to form a printed strip-shaped substrate sheet, while providing a pressure-sensitive adhesive layer on the other side of the second release sheet that has been subjected to a release treatment on one side. Forming a strip-shaped adhesive sheet
While continuously transferring the base material sheet and the pressure-sensitive adhesive sheet toward the transfer roll, the base material surface of the base material sheet was fed and pressed so as to be in contact with the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet. A method for producing a printed adhesive tape, which comprises removing one release sheet.