JPS5848350B2 - Lamination method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is applicable to base materials such as wood, in which the surface has fine irregularities due to conduits, etc., and penetration of adhesive to a non-negligible extent occurs when a decorative sheet is applied. This is a method of laminating sheets using a mechanical method, and on the one hand, the decorative sheet can be attached not only to flat substrates but also to substrates with curved surfaces such as edge materials. Regarding how it was done.

Conventionally, decorative sheets with beautiful wood grain patterns have been attached to base materials such as plywood, particle board, inorganic materials, and wood to create a good appearance and a sense of luxury for use as construction and furniture materials. There are many problems in manufacturing such imitation veneers or wood.

First, most of these base materials have minute irregularities on their surfaces, which causes significant penetration of the adhesive.

Therefore, when the amount of adhesive is small, the penetration of the adhesive into the base material is insufficient, which tends to cause a peeling phenomenon after pasting.

You might think that all you have to do is apply a large amount of adhesive and stick it, but in reality it is not that simple.

An increase in the amount of coating on the back side of the decorative sheet will lead to roughness of the coated surface, which may cause wrinkles and misalignment during mechanical lamination, and may cause blisters and bubbles to form in the adhesive layer when drying.

As a countermeasure, it is possible to sufficiently heat the adhesive layer and pre-dry it before bonding, but heating may cause thermal deformation to the decorative sheet.

This thermal deformation occurs most significantly when the base of the decorative sheet is a thermoplastic synthetic resin such as a vinyl chloride resin film, but it is unavoidable to some extent even with other materials such as resin-impregnated paper or board.

Such thermal deformation not only reduces the luster on the surface of the decorative sheet, but also causes distortion of the decorative sheet, which causes a phenomenon of returning after application, causing the decorative sheet to lift or peel. It is something.

This phenomenon is particularly noticeable when the decorative sheet is attached to a base material having an uneven surface, such as a border material.

However, as a result of extensive research, the present inventors found that the above-mentioned problem of thermal deformation can be avoided by pre-drying in a relaxed state without applying tension, and furthermore, when pasting, the decorative sheet It is necessary to apply tension to prevent slippage and wrinkles,
As a countermeasure to this problem, the inventors have discovered that once the pre-dried decorative sheet is cooled, tension can be applied without any problem, and that the decorative sheet can therefore be attached to any base material by a mechanical method, leading to the present invention.

That is, the present invention is a process of applying a large amount of solvent-based adhesive to the back side of a decorative sheet based on a board, resin-impregnated paper, thermoplastic composite or resin film, etc., in a state where no tension is applied such as on a belt conveyor. A process of heating and drying the adhesive layer on the back side of the decorative sheet using a heating device while transporting the decorative sheet using a transfer device capable of transporting a sheet-like object, followed by cooling the decorative sheet using a cooling roll and applying tension to align the decorative sheet. It is characterized by comprising a step of applying the decorative sheet to an arbitrary base material by reheating to activate the adhesive layer and immediately pressing the decorative sheet to the base material using a pressing jig. This is a laminating method.

A more detailed explanation will be given based on FIG. 1 showing an embodiment of the present invention.

The decorative sheet 1 may be sheet-shaped, but it is convenient to use a roll-up sheet as shown in the figure.

To explain this below, a decorative sheet 1 is supplied from an unwinding section 2, reaches a spreader 3, and an adhesive abrasion is applied to the back surface.

In this case, it is preferable to use an adhesive with a high solids content relative to the solvent, for example, one with a solids content of about 50 parts, since this will prevent unevenness in the appearance of the adhesive and the edges.

The coating amount is 150-2 oogy (in the undried state).
It has a rather large number of eyes.

The back surface to which the adhesive has been applied reaches Dr.Frede 4, where it undergoes a surface smoothing action and becomes an adhesive layer.

Subsequently, the decorative sheet 1 is placed on a belt conveyor 5 and conveyed, passing through a heater box 6 to which heated air is supplied, thereby heating and drying the adhesive layer on the back surface of the decorative sheet.

At this time, since the makeup sheet is being transported in a relaxed state without any tension being applied, thermal deformation etc. can be suppressed as much as possible.

Furthermore, since the heater box 6 is a heating device that introduces hot air into the compartment, the decorative sheet 1 is uniformly heated from its surroundings, and bending that tends to occur due to local heating can be suppressed as much as possible.

Although the decorative sheet leaving the heater box 6 has a suitably dried adhesive layer of good quality, it is in a relaxed state and is therefore unsuitable for pasting.

Here, the cooling roll 7 cools the decorative sheet 1, and the tension roll 8 makes it possible to bring the decorative sheet 1 into a tensioned state.

Tensioned and smoothed decorative sheet 1 base material 9
Immediately before reaching the adhesive layer of the decorative sheet 1, hot air is sent to the adhesive layer of the decorative sheet 1 from the blow nozzle 14 to reheat it and activate the adhesive layer.

To briefly explain the pasting process, the base material 9 is fed by a transport device such as a feed roller 10 in synchronization with the conveyance speed of the decorative sheet 1, but before it reaches the pasting position, the preliminary heater 11 It is convenient that the adhesive is heated appropriately.

Pressing and adhering the decorative sheet 1 to the base material 9 is carried out using a presser jig 12 such as a press roll or a presser plate. If so, the base material 9
A large number of presser jigs 12 for partially pressing the adhesive surface of the base material 9 are arranged along the traveling path of the base material 9, and the decorative sheet 1 is pressed on localized areas in an orderly manner according to the surface of the base material 9. It is attached to the material 9.

If a heating heater 13 such as an infrared heater is provided during adhesion, it will accelerate the fixation and curing of the adhesive. A material with excellent properties is used.

The present invention is as described above, and makes it possible to attach a decorative sheet to a base material with excellent adhesive permeability by a mechanical method, which was previously considered difficult. This is applicable not only to flat substrates but also to substrates with uneven curved surfaces, and by performing pre-drying, it is possible to reduce the time required for adhesion, especially the time and equipment required for drying after adhesion. The present invention is extremely superior in that lamination can be performed rapidly.

[Brief explanation of drawings]

FIG. 1 is an explanatory view showing an example of the lamination method of the present invention, and FIG. 2 is a sectional view showing a decorative material in which a decorative sheet is adhered to an uneven base material according to the present invention. 1... Decorative sheet, 3... Spreader, 5... Belt conveyor, 6... Heater box, 7... Cooling roll 8. ...
... Tension roll, 9 ... Base material, 10 ...
...Feed reroller, 12...Press jig, 13.
... Heater 14 ... Nozzle.

Claims (1)

[Claims] 1. A process of applying a solvent-based adhesive to the back side of a decorative sheet based on a board, resin-impregnated paper, thermoplastic resin film, etc., and applying a solvent-based adhesive to the back side of a decorative sheet made of a board, resin-impregnated paper, thermoplastic resin film, etc. A step of heating and drying the adhesive layer on the back side of the decorative sheet using a heating device while conveying the decorative sheet, followed by cooling the decorative sheet using a cooling roll,
and a step of smoothing the surface by applying tension, and a step of reheating and activating the adhesive layer and immediately pressing the decorative sheet onto the base material using a pressing jig. A laminating method that adheres to a base material.