JPS5935789B2 - Dry edge formation method - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for forming a dry edge.

In the case of a single adhesive substance layer or a laminate of the substance layer and a support, a protective film is temporarily attached to protect the surface of the substance layer to form an adhesive body.

Such adhesive bodies are usually wound into a roll for convenient storage and transportation. However, there is a problem in that the material layer deforms and flows over time and protrudes from the sides of the rolled material, and the protruded materials stick together on the sides, making it difficult to unwind the material. be. As a method for solving this problem, a method called a so-called dry edge is known in which the edge of the protective film is extended from the edge of the material layer.

The following method is known as a method for forming such a dry edge, but it has the drawbacks described above. (A method in which a protective film of the same width is previously attached to the surface of an adhesive substance layer, the film is peeled off from the adhesive body, and then a protective film of a wider width is attached.

This method has the disadvantage that not only can the original protective film not be reused, but it also requires rewinding.

(b) A method in which an adhesive substance is coated in stripes on the surface of the protective film, and the protective film is cut between the layers of the coated stripe.

This method has the disadvantage that it is difficult to cut the protective film at the center between the material layers, making it difficult to obtain a uniform product.

←Ke A trimming method in which only the end material layer is cut and removed from an adhesive body in which a protective film of the same width has been temporarily attached to the surface of the adhesive material layer.

This method has the disadvantage of an overall high cost since trimmed material layers cannot be used.

(→ A method of forming a protective film with a width narrower than the width of the film by extruding it onto the surface of a protective film of a predetermined width.

This method has the disadvantage that die slots are required for each required width. The present invention relates to a novel dry edge forming method developed as a result of intensive studies in view of the drawbacks of the prior art.

That is, the present invention provides a tri-edge forming method in which a film of an adhesive body consisting of at least an adhesive material layer and a protective film (sheet) for protecting the layer is extended from the end of the layer, A first step of laminating a protective film having a flat loop cross section at desired intervals in the longitudinal direction, a second step of cutting the entire bonded product approximately at the center of the loop-shaped portion, and a second step of cutting the entire bonded product approximately at the center of the loop-shaped portion; a third step of unbending half the loops and extending them from the ends of the material layer; a first step of bonding while forming and making the loop shape into a flat loop in cross section; a second step of cutting the entire bonded product approximately at the center of the flat loop portion;
The present invention provides a method for forming a dry edge, comprising a third step of unbending approximately half of the cut loop to extend from the end of the material layer.

The present invention will be specifically explained below using the drawings.

FIG. 1 is a front view of a protective film (sheet) 1 having flat loops 11 in cross section at desired intervals in the longitudinal direction, and the loops 11 are shown in FIGS. 5, 6, T, and 8. It is made by forming a loop shape using a loop forming mechanism such as the one shown in FIG. The protective film 1 configured in this manner is temporarily attached to the surface of the adhesive material layer 21 (see FIG. 2). FIG. 2 shows an example in which the material layer 21 is supported on a support 22. As shown in FIG. The material layer 21 can be formed by applying an adhesive material to the surface of the protective film 1 and drying it, or by extruding it.
The adhesive body 3 with the protective film 1 temporarily attached to the surface of the material layer 21 as shown in FIG. 3'l)S is obtained. Approximately half of the cut loop is unbent by applying a tongue-like jig (not shown) to the folded portion of the loop as shown by the arrow. Protective film 1 as shown in the figure
The end of the material layer 21 is extended from the end of the material layer 21 to obtain a dry-edged adhesive body 3't). FIG. 5 shows a flat protective film 1 with a loop 12 formed thereon, bonded to the surface of a material layer 21, and then pressure-bonded to form a loop 11 with a flat cross section.
In this example, the protective film 1 is molded into a loop-shaped cross-section as shown in FIG. 6 by a roll 41 having an H-shaped cross-section and a roll 42 rotating within its groove. Next, the adhesive body 3 is pasted through the material layer 21 from the side opposite to the molding side, and is then crimped with pressure rolls 51 and 52, so that the loop shape 12 has a flat cross section as shown in FIG. It becomes a loop shape 11. Note that if air is blown into the loop 12 when the protective film 1 with the molded cross-sectional loop 12 and the material layer 21 are bonded together, the loop 12 just before being crimped will deform into a hemispherical shape. This is preferable because a flat loop shape 11 with a uniform cross section can be obtained by pressure bonding. The adhesive body 3 to which the protective film 1 having the flat loop-shaped cross section 11 is bonded in this way is then cut and unbent into the loop shape by the same operations as described above, and a dry-edged adhesive body is obtained. . Note that FIG. T and FIG. 8 show other examples of the molding mechanism for forming the loop shape 12, in which 61 and 62 are molding dies, and T1 and T2 are guides. As described above, the method for forming a dry edge of the present invention is to form a loop with a flat cross section on a predetermined protective film in advance, or to form a flat loop in cross section after lamination, and then cut and extend the film. ,
It is characterized by the fact that there is no wastage of materials or work processes, and a uniform product can be obtained.

[Brief explanation of drawings]

FIG. 1 is a partial front view of the protective film used in the present invention;
Fig. 2 is a partial front view showing the protective film shown in Fig. 1 bonded to the surface of the adhesive material layer; Fig. 3 is a front view of the adhesive body obtained by cutting the bonded product shown in Fig. 2; Fig. 4 is a front view of a product obtained by the method of the present invention, Fig. 5 is an explanatory diagram showing an outline of the forming method of the present invention, and Fig. 6 is a cross section taken along line I-I' in Fig. 5. 8 are partial front views showing other examples of the molding machine. 1... Protective film, 11... Flat circular cross section, 12... Loop shaped cross section, 21...
...Adhesive substance layer.

Claims (1)

[Scope of Claims] 1. A dry edge forming method in which a film of an adhesive body consisting of at least an adhesive substance layer and a protective film (sheet) for protecting the layer is extended from an end of the layer, the dry edge forming method comprising: A first step of laminating the material layer and a protective film having a flat loop cross section at desired intervals in the longitudinal direction, a second step of cutting the entire bonded product approximately at the center of the loop-shaped portion, and cutting. A method for forming a dry edge, comprising a third step of unbending approximately half of the loop formed so as to extend from the end of the material layer. 2. A dry edge forming method in which a film of an adhesive body consisting of at least an adhesive material layer and a protective film (sheet) for protecting the layer is extended from an end of the layer, the method comprising: A first step of bonding while forming a loop shape in cross section at a desired interval in the longitudinal direction and turning the loop into a flat loop in cross section, and a second step of cutting the entire bonded product approximately at the center of the flat loop portion. . A third step of unbending approximately half of the cut loop to extend from the end of the material layer.