JPH0684044B2 - Preventing tunneling in dry lamination - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry laminate in which two substrates are attached.

[0002]

2. Description of the Related Art In the case of laminating two base materials, an adhesive solution having a solid content of about 30% diluted with an aromatic solvent such as toluene acetate is applied to the base material 1 with a certain width left on both sides. Then, the laminate-side base material 2 is attached so as to sandwich the adhesive 3 after evaporation of the solvent, and is loosely wound on a winding roll.

In this case, the reason for the loose winding is as follows. That is, the used adhesive 3 is, as shown in FIG.
The adhesive strength increases with time (days), and it takes about 3 days to reach the required strength. During this time, the viscosity of the adhesive 3 also increases with the number of days and hardens.

Therefore, an aging time of about 3 days after winding is required. Due to evaporation of the solvent remaining during this aging time, the aging time becomes long unless gas is allowed to flow between the layers of the wound base material.

[0005]

However, as described above, the viscosity of the adhesive 3 is low at the beginning of the aging time, and if the adhesive 3 is loosely wound, the base material 1 and the laminating material 2 are misaligned. This is apt to occur, and air is likely to enter between the layers due to this deviation, so-called tunneling 9 occurs, which causes defective products.

It is an object of the present invention to provide a method for preventing interlayer displacement or tunneling which causes defective products without prolonging the aging time.

[0007]

In order to solve the above-mentioned problems, a base side base material 1 coated with an adhesive 3 while leaving a constant width on both sides and a laminating side base material 2 not coated with the adhesive 3 are provided. In the dry lamination to be stuck together, the both sides not coated with the adhesive 3 are pressed by the embossing roll 4 immediately after the sticking.

[0008]

As described above, both ends are mechanically prevented by the embossing rolls from being displaced immediately after laminating, so that the displacement does not occur even in a loose winding state. Therefore, tunneling does not occur.

[0009]

EXAMPLE FIG. 1 is a process explanatory view of a laminated base material manufactured by the method of the present invention, (a) is a sectional view perpendicular to the flow direction immediately after lamination, and (b) is also after passing through an embossing roll. FIG. 3C is a plan view after passing through the embossing roll.

The installation position of this embossing roll is, as shown in FIG. 2, between the drive roll 6 and the pressure roll 7 for laminating the base material 1 and the laminating material 2 to the next guide roll 8. is there. At this position, pressure is applied to a portion where the adhesive 3 after lamination is applied by a roll in which the embossing roll 4 and the rubber roll 5 face each other as shown in FIG. 3 to give the embossing as shown in FIG. Mechanically prevent the displacement.

The embossed shape is not limited to the X shape shown in FIGS. 1 and 3, but may be any of parallel slanted lines, axial parallel lines or dotted lines.

[0012]

As described above, since the mechanical displacement is prevented by the embossing when the adhesive is not yet hardened immediately after the lamination, it is possible to prevent the occurrence of tunneling due to the displacement.

[Brief description of drawings]

FIG. 1 is a process explanatory view of a laminate base material manufactured by the method of the present invention, (a) is a sectional view perpendicular to the flow direction immediately after lamination, and (b) is a sectional view after passing through an embossing roll. (C) is a plan view after passing through the embossing roll.

FIG. 2 is an explanatory diagram of an embossing roll installation position.

FIG. 3 is a perspective view of an embossing roll.

FIG. 4 is an adhesive strength characteristic diagram of an adhesive.

FIG. 5 is a perspective view showing a state in which tunneling 9 is generated by a conventional laminating method.

[Explanation of symbols]

 1 Base Side Base Material 2 Laminate Side Base Material 3 Adhesive Material 4 Embossing Roll 5 Rubber Roll 6 Driving Roll

Claims (1)

[Claims] 1. In a dry laminate in which a base material coated with an adhesive and a laminate material not coated with the adhesive are bonded to each other with a certain width left on both sides, the adhesive is not applied immediately after bonding. A method for preventing tunneling in dry lamination, characterized in that both side portions are pressure-welded with an embossing roll.