JP4679449B2 - Release sheet - Google Patents

Description

    The present invention relates to a release sheet, and more particularly to a release sheet that can easily remove a release agent transferred and transferred to a back surface.

Conventionally, in a release sheet manufacturer that manufactures a release sheet having a release agent layer formed on the surface of a base sheet, the release sheet is wound into a roll and shipped to a factory or the like.
The label maker using this unravels the roll-shaped release sheet, applies an adhesive or a pressure-sensitive adhesive to the release agent layer of the release sheet, forms a label by sticking a sheet-like member, and forms a roll. It is rolled or cut into a lithographic state and provided to the user.
In the case of cutting into a lithographic state, in the manufacturing process, the label is wound in a roll shape and then cut.

However, when the user performs printing, inkjet, or the like on the surface side of the label, there is a problem in that a portion where printing, inkjet, or the like cannot be performed on a part of the surface occurs.
This is because, first of all, the release sheet maker rolls the release sheet in a roll shape and ships it, so that the release agent layer on the surface of the release sheet is released on the back surface of the release sheet. Transfer of a part of the agent to the back side of the release sheet,
Next, in a label maker that forms a label by attaching a sheet-like member to the release agent layer that is the surface of the release sheet, a part of the release agent is transferred to the back surface of the release sheet manufacturer. Since the label is rolled into a roll shape using the `` transferred release sheet '', the release agent transferred and transferred to the back side of the release sheet of the label is transferred and transferred again to the surface of the label. It became clear that it was not possible to apply etc.

    An object of this invention is to provide the release sheet which removed the said problem.

    In order to achieve the above object, the release sheet of the present invention is bonded to the base sheet, the release agent layer formed on the surface of the base sheet, and the back surface of the base sheet with a weak adhesive force. The adhesive strength between the base sheet and the protective sheet is such that it can be peeled off by hand.

    The release sheet according to claim 2 is the release sheet according to claim 1, wherein the base sheet is one of paper, PE laminate paper, PP laminate paper, plastic film, and non-woven fabric. The sheet is one of paper, PE laminated paper, PP laminated paper, plastic film, and non-woven fabric, and the protective sheet is bonded to the back surface of the base sheet via a resin layer.

    The release sheet according to claim 3 is the release sheet according to claim 1 or 2, wherein the release sheet is wound in a roll shape.

According to the release sheet of claim 1, even if the release sheet is rolled up, the release agent of the release agent layer on the surface of the base sheet is transferred to the protective sheet on the back surface. After forming a label by sticking a sheet-like member to the release agent layer, which is the surface of the sheet, via an adhesive or pressure-sensitive adhesive, or before forming the label, the protective sheet is peeled off from the base material sheet and released. The release agent transferred and transferred to the back surface of the mold sheet can be removed.
As a result, even if the protective sheet is removed and the label is wound in a roll shape, the release agent can be prevented from being transferred again to the surface of the label, and printing, ink jet, or the like can be performed on the surface of the label. .

An embodiment of the present invention will be described with reference to the drawings.
Example 1
In FIG. 1, S is a release sheet, and the release sheet S is, for example, a release sheet that is wound in a roll and is attached to a label. 2 and 3, the release sheet S is weakly bonded to the base sheet 1, the release agent layer 2 formed on the surface of the base sheet 1, and the back surface of the base sheet 1. The protective sheet 3 is adhered by force.

The base sheet 1 is, for example, paper, PE laminated paper, PP laminated paper, plastic film (PET, LDPE, HDPE, LLDPE, EVA, CPP, OPP, ONy), non-woven fabric, etc., and the thickness is about 10 μm to 130 μm. is there.
The release agent layer 2 is, for example, a silicone release agent, a fluorine release agent, or a modified silicone release agent, and has a thickness of 2 μm or less, preferably 1 μm or less.
The protective sheet 3 is, for example, paper, PE-laminated paper, PP-laminated paper, plastic film (PET, LDPE, HDPE, LLDPE, EVA, CPP, OPP, ONy), non-woven fabric, etc., and the thickness is about 10 to 50 μm. .
The protective sheet 3 and the back surface of the base sheet 1 are bonded with a weak adhesive force. The weak adhesive strength is such that the adhesive strength between the base sheet 1 and the protective sheet 3 can be peeled by hand. In terms of the adhesive strength, the peeling speed is 0.3 mm / min according to JIS-Z0237, The peel strength is about 0.1 to 5.0 N / 25 mm by a measurement method with a peel angle of 180 ° and a measurement width of 25 mm.
Specifically, a resin [for example, LDPE, LLDPE, HDPE, MLLDPE, PP, EVA, IO, EAA, EMAA, EEA, polyamide resin, polyester resin (PET polyethylene) is formed between the protective sheet 3 and the base sheet 1. Terephthalate)] is laminated (sand lamination) by melt extrusion to form an adhesive layer (resin layer) 4 between the protective sheet 3 and the base sheet 1.
In such a case, the adhesive layer (resin layer) 4 adheres firmly to the back surface of the base sheet 1, but since the adhesion to the protective sheet 3 is weak, the protective sheet 3 can be easily removed from the back surface of the base sheet 1. Can be peeled off by hand.

Therefore, the release sheet manufacturer ships the release sheet S shown in FIG. 3 in the form of a roll as shown in FIG. 1 and releases the release agent layer 2 on the surface of the base sheet 1. The mold is transferred and transferred to the protective sheet 3 on the back side, but the label maker using this unrolls the roll-shaped release sheet S, applies a pressure-sensitive adhesive or an adhesive to the release agent layer 2, and forms a sheet. A member (not shown) is pasted to form a label (not shown), and then (or before the label is formed), the protective sheet 3 to which a part of the release agent is transferred is transferred from the base sheet 1. The release agent that has been peeled off and transferred to the back surface of the release sheet S can be removed.
Therefore, even if the label maker removes the protective sheet 3 from which a part of the release agent has been transferred and rolls the label (not shown) in a roll shape, the release is applied to the surface of the label (not shown). It is possible to prevent the agent from transferring and transferring again, and a user who uses the agent can perform printing, inkjet, or the like on the surface of a label (not shown).

(Example 2)
In addition, in the Example mentioned above, when the resin layer 4 is interposed between the back surface of the base material sheet 1 and the protective sheet 3, and the protective sheet 3 is peeled from the back surface of the base material sheet 1, an adhesive layer (resin Layer) 4 is left on the back surface of the base sheet 1, but in the present invention, the adhesive force between the protective sheet 3 and the base sheet 1 is weak (not limited to this example). Therefore, the adhesive layer (resin layer) 5 may be left on the protective sheet 3 side when peeling by hand (see FIG. 4).
That is, an adhesive, for example, a solvent-based adhesive, is applied to the surface of the protective sheet 3 facing the base sheet 1 and dried, and then the adhesive surface of the protective sheet 3 is matched with the back side of the base sheet 1. That is, the protective sheet 3 and the back surface side of the base sheet 1 are bonded together via the adhesive layer 5 by dry lamination.
At that time, on the side of the protective sheet 3 facing the base sheet 1, before applying the adhesive, a corona treatment is applied in advance to increase the adhesive strength with the adhesive. The side facing the protective sheet 3 is not subjected to corona treatment so as not to increase the adhesive strength with the adhesive.
Next, a silicone release agent, a fluorine release agent, and a modified silicone release agent are applied to the surface of the substrate sheet 1 to form a release agent layer 2 and wound into a roll.

(Example 3)
In the following embodiment, a pressure sensitive adhesive, for example, a releasable pressure sensitive adhesive, is applied to the surface of the protective sheet 3 facing the base material sheet 1, and the adhesive surface of the protective sheet 3 is applied to the surface of the base material sheet 1. The protective sheet 3 is bonded to the base sheet 1 via the releasable pressure-sensitive adhesive layer 6 in accordance with the back side (see FIG. 5).
Next, a silicone release agent, a fluorine release agent, and a modified silicone release agent are applied to the surface of the substrate sheet 1 to form a release agent layer 2 and wound into a roll.
Since the adhesive strength between the protective sheet 3 and the base sheet 1 is weak (the adhesive strength is the same as in Example 1), the peelable pressure-sensitive adhesive layer 6 is particularly on the protective sheet 3 side when peeling by hand. It leaves and peels in the boundary surface of the back surface of the base material sheet 1, and the releasable adhesive layer 6 left.
The re-peeling adhesive 6 includes a synthetic rubber type, an acrylic resin type, a silicon resin type, and the like. Examples of the synthetic rubber include polyisobutylene rubber and isoprene rubber. Examples of the acrylic resin system include acrylic acid, ethyl acrylate, and methyl acrylate. Examples of silicon resin include dimethylpolysiloxane.

FIG. 1 is a schematic side view of a state in which a release sheet according to an embodiment of the present invention is wound in a roll shape. FIG. 2 is a schematic side view of a state in which a part is pulled out from the release sheet of FIG. 3 is a schematic cross-sectional view taken along line 3-3 of FIG. FIG. 4 is a schematic cross-sectional view of a release sheet of another embodiment different from the embodiment of FIG. FIG. 5 is a schematic cross-sectional view of a release sheet of another embodiment different from the embodiment of FIG.

Explanation of symbols

S release sheet 1 base sheet 2 release agent layer 3 protective sheet

Claims (3)

A base sheet;
A release agent layer formed on the surface of the base sheet,
A release sheet comprising a protective sheet adhered to the back surface of the base sheet with a weak adhesive force, and the adhesive force between the base sheet and the protective sheet is such that it can be peeled by hand. Sheet. The base sheet is one of paper, PE laminated paper, PP laminated paper, plastic film, and non-woven fabric,
The protective sheet is one of paper, PE laminated paper, PP laminated paper, plastic film, non-woven fabric,
The release sheet according to claim 1, wherein the protective sheet is bonded to the back surface of the base sheet via a resin layer.     The release sheet according to claim 1 or 2, wherein the release sheet is wound in a roll shape.

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