JPH0940925A - Production of marking sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a marking sheet which is free from whitening during the storage of its roll by sticking a resin sheet formed on a process paper to a self-adhesive layer formed on a release paper, winding up the resultant laminate, unwinding it, and peeling off the process paper while simultaneously winding up the rest again. SOLUTION: In a production process of a marking sheet, a synthetic resin sheet formed by casting and drying a synthetic resin (e.g. polyvinyl chloride) sol on a process paper is stuck to a self-adhesive layer formed on a release paper and the resultant laminate is wound up. The roll of the laminate is then unwound and, while the process paper is being peeled off, a marking sheet comprising the resin sheet and the self-adhesive sheet is wound up together with the release paper again into a roll. Thus, the pressure applied to between the surface of the marking sheet and the back side of the release paper is reduced, preventing the whitening of a marking sheet occurring during the storage of its roll.

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 marking sheet which is attached to an adherend with an adhesive for the purpose of decoration and display.

[0002]

2. Description of the Related Art Conventionally, a marking sheet obtained by casting a vinyl chloride sol obtained by dispersing a pigment or the like in a vinyl chloride resin on a process paper has been used for decoration and display. In order to withstand long-term use for decoration and display, a casting sheet with less molding distortion is used.

A sol in which a vinyl chloride resin is dispersed in an organic solvent is cast onto process paper, dried to form a sheet, and a pressure-sensitive adhesive layer formed by separately coating and drying on release paper is applied to the above-mentioned sheet. A method for producing a marking sheet having a pressure-sensitive adhesive layer by pasting is known. In the above conventional manufacturing method, the sheet formed on the process paper and the pressure-sensitive adhesive layer formed on the release paper are stuck together, the process paper is peeled off before winding this, and the sheet is wound together with the release paper. A primary stock having a length of about 500 m to 1000 m was taken out again and cut into a length of a commercially available unit to make a small roll product.

[0004]

As described above, the length is 5
When a long marking sheet having a length of 00 to 1000 m is used as a roll, a large pressure is applied to the winding core with the back surface of the release paper overlapping the sheet surface. However, the surface of the sheet and the back of the release paper are originally separated from each other, and because they are overlapped because they are made into scrolls, they do not completely adhere to each other. By entraining air at this time, an extremely thin air layer is formed between the sheet surface and the back surface of the release paper. That is, the surface of the sheet is in direct contact with high pressure air. The thick-wrapped marking sheet is rewound and cut to form a small-wrapped product having a predetermined length. However, it may be stored for a long time before the process of making this small rolled product.

There is no problem if the thick roll is immediately transferred to the small roll, but if the thick roll is stored for a long time, the surface of the sheet in the portion where the air layer as described above is formed is There is a problem that the product value is lowered due to whitening and matte state called "cloudy weather".
As a means for solving such a problem, the back surface of the release paper is intentionally interspersed with projections of innumerable fine particles to form fine irregularities on the sheet surface, thereby making diffuse reflection of light as a whole, There is a report that the cloudy part is made inconspicuous (Japanese Patent Laid-Open No. 4-272982). However, when such minute irregularities are formed on the surface of the sheet, the entire surface becomes matte, which is unsuitable when gloss is required.

The present invention solves the above-mentioned conventional problems, does not cause "cloudiness" even when a long adhesive sheet having an adhesive layer laminated is used as a scroll, and does not require "cloudy" removal work by heat treatment. It is an object of the present invention to provide a method for manufacturing a marking sheet that can increase the manufacturing efficiency.

[0007]

According to the method for producing a marking sheet of the present invention, a synthetic resin sol is cast on a process paper and dried to form a synthetic resin sheet, and a pressure-sensitive adhesive layer separately formed on a release paper surface is added to the synthetic resin. In the method of manufacturing a marking sheet by sticking on the sheet surface,
A marking sheet, in which a pressure-sensitive adhesive layer separately formed on release paper is attached to a synthetic resin sheet on the process paper, is temporarily wound together with the process paper, and is rewound to rewind the marking sheet together with the release paper while separating the process paper. It is characterized by

The step paper used in the present invention is preferably one obtained by subjecting a synthetic resin sheet surface having heat resistance such as polyester to a release treatment with silicone or the like. The synthetic resin that constitutes the sheet in the present invention is one that can be cast-molded as a sol, and examples thereof include vinyl chloride resin and polyurethane.

The case of producing a marking sheet using vinyl chloride sol in the present invention will be described below. The vinyl chloride sol contains vinyl chloride resin and an organic solvent that does not substantially dissolve the vinyl chloride resin as main components, and a plasticizer is added to the vinyl chloride sol to soften the resin. Also, for vinyl chloride sol,
A dye or pigment or an inorganic powder may be added for the purpose of coloring. As the organic solvent that does not substantially dissolve the vinyl chloride resin, toluene, xylene, cellosolve, methyl isobutyl ketone, or the like having a boiling point of 100 to 180 ° C. is used.

A roll coater such as a comma coater is usually used for casting and coating vinyl chloride sol on process paper. The coating amount is 30 to 70 μm after the sol is dried, this is dried at 50 to 150 ° C., and then cured at 170 to 200 ° C. As described above, when the sheet is formed by casting on the process paper and drying and curing the sheet, the adhesion between the process paper and the sheet is good and no gap is formed. However, it can be easily peeled off by giving a peeling force. If the thickness of the obtained sheet is less than 30 μm, the strength is insufficient and the sheet is easily damaged, and if it exceeds 70 μm, the rigidity is too strong and the workability is deteriorated.

The pressure-sensitive adhesive layer used in the present invention is preferably an acrylic pressure-sensitive adhesive which has been conventionally used for marking sheets. Generally, the thickness of the pressure-sensitive adhesive layer is suitable to be 20 to 40 μm. As the release paper for forming the pressure-sensitive adhesive layer, those conventionally used for transferring the pressure-sensitive adhesive layer can be used.

When the vinyl chloride resin sheet formed on the process paper is attached to the pressure-sensitive adhesive layer surface formed on the release paper, the pressure-sensitive adhesive layer is bonded to the sheet. In the present invention, the process paper is laminated on the vinyl chloride resin sheet to which the pressure-sensitive adhesive layer is adhered together with the release paper, and once as a raw roll, 500 to 1 is used.
Roll up with a length of 000m. The wound roll roll marking sheet receives a large pressure from the outside toward the winding core, but since the sheet is formed by casting molding on the process paper, it has good adhesion to the process paper and the sheet surface. There is no gap with the process paper. As a result, "cloudy weather" does not occur on the surface of the vinyl chloride resin sheet.

In order to commercialize the above original fabric roll, it is rewound to a predetermined length. In the present invention, the process paper is peeled off at the time of rewinding, the marking sheet on which the release paper is laminated is cut into a predetermined length and wound up, and if necessary, slit at the same time to obtain a product having a predetermined width. . The peeled process paper can be reused. If strong tension is applied during this rewinding, "cloudy weather" may occur due to the winding pressure during storage. For this reason, it is preferable that the marking sheet is peeled along the pinch roll and wound in a state where the winding pressure is small so that the marking sheet does not receive tension when peeling the process paper.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The method for producing the marking sheet of the present invention will be described below with reference to Examples. (Embodiment) FIGS. 1 and 2 are explanatory views for explaining an embodiment of a method for producing a marking sheet according to the present invention. In FIG. 1, polyethylene having a thickness of 170 μm is laminated on both sides, and a vinyl chloride resin sol having the following composition is cast on three surfaces of the process paper treated with silicone on the polyethylene layer, dried and cured to obtain a vinyl chloride having a thickness of 50 μm. Sheet 11 was formed.

Composition of vinyl chloride resin sol Vinyl chloride resin 100 parts by weight Ba / Zn-based stabilizer 2 parts by weight UV absorber 0.5 parts by weight Polyester-based plasticizer 30 parts by weight Hydrocarbon-based organic solvent 80 parts by weight

On the other hand, the pressure sensitive adhesive layer 12 was formed by coating and drying an acrylic pressure sensitive adhesive on the release paper 2 so that the thickness after drying was 30 μm. The process paper 3 and the release paper 2 are supplied between the pinch rolls 4 and 4 so as to be laminated so that the pressure-sensitive adhesive layer 12 is superposed on the vinyl chloride sheet 11, and the original fabric 1a is passed through the guide roll 5 to a length of 500 m. It was wound into a roll 10 to be a raw roll. FIG. 2 is an enlarged sectional view of a portion A of the original fabric 1a shown in FIG.

After the original roll 10 is stored for a period of one month, it is fed out as shown in FIG.
Along with the pressure-sensitive adhesive layer and the release paper 2, the vinyl chloride sheet 11 was peeled from the process paper 3 along with, and cut into a predetermined length while being wound to obtain a marking sheet 1 in which the release paper 2 was laminated. No "cloudy weather" was found on the surface of the vinyl chloride sheet 11 of the obtained marking sheet 1, and there was no need to remove "cloudy weather" in the process of slitting this into a predetermined width, and slitting was performed at a line speed of 30 m / min. We were able to.

[0018]

The present invention is configured as described above, and since the sheet is formed on the process paper by casting, the sheet is in close contact with the process paper without a gap, and the process paper is stored in a state of being stuck. However, there is no gap between the sheet and the process paper. As a result, "cloudy weather" does not occur on the surface of the vinyl chloride resin sheet, the work for removing "cloudy weather" by heat treatment is not required, and the manufacturing efficiency can be improved.

[0019]

[Brief description of drawings]

FIG. 1 is an explanatory view for explaining an embodiment of a method for manufacturing a marking sheet of the present invention.

FIG. 2 is an enlarged sectional view of a portion A in FIG.

FIG. 3 is an explanatory diagram for explaining an example of a method for manufacturing a marking sheet according to the present invention.

[Explanation of symbols]

 1: Marking sheet 1a: Original fabric 2: Release paper 3: Process paper 4, 6: Pinch roll 5: Guide roll 10: Original fabric roll 11: Vinyl chloride sheet 12: Adhesive layer

Claims (1)

[Claims] 1. A method for producing a marking sheet by casting and drying a synthetic resin sol on a process paper sheet to form a synthetic resin sheet, and bonding a pressure-sensitive adhesive layer separately formed on a release paper surface to the surface of the synthetic resin sheet. In the above, the marking sheet, in which the adhesive layer separately formed on the release paper is attached to the synthetic resin sheet on the process paper, is temporarily wound up together with the process paper, and is unreeled to separate the process paper and release the marking sheet together with the release paper. A method for manufacturing a marking sheet, which comprises winding the marking sheet.