JPH06182870A - Laminating method for printed matter - Google Patents

Abstract

PURPOSE:To provide possibility of using a soft film having a low melting point and to obtain a laminated printed matter which is not a plate state but finished in a soft state by coating a rear surface of the film in which melting points are specified with a hot-melt adhesive, and interposing an intermediate printed matter to be held between two protective films adhered with films each having a high melting point. CONSTITUTION:A rear surface of a film 2 having a low melting point of 150 deg.C or lower is coated with a hot-melt adhesive 3 having a lower melting point than that of the film 2. Two protective films adhered with a film 5 having a high melting point of 200 deg.C or higher on front surfaces of the films 2 are opposed at the adhesive 4 side, a printed matter 6 is interposed to be held at its intermediate and hot pressed. A protective material is formed by coating the rear surface of the film 2 having the low melting point of 150 deg.C or lower with the hot-melt adhesive having lower melting point than that of the film 2, opposing the two films 2 adhered with the films 5 each having the higher melting point of 200 deg.C to the front surfaces of the films 2 at the adhesive 4 side, and adhering only one ends of the protective films.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for laminating a printed material, and more particularly to a method for laminating a printed material with a film having a low melting point (softening point) such as soft polyvinyl chloride.

[0002]

2. Description of the Related Art For the purpose of protecting printed matter such as paper, so-called laminating in which both surfaces thereof are covered with protective films (in this specification, film is used as a concept including a sheet) is widely used. Examples include restaurant menus, sales promotion catalogs, list of prices, posters, and the like. This method prepares two base material films with a hot-melt type adhesive applied to one side, puts the adhesive side together, and sandwiches a printed matter (a little smaller than the film) in the middle and heats it from the outside. In this method, the adhesive melts and the paper, the base material, and the base material film are adhered to each other.

Polyester is usually used for this substrate, and EVA (ethylene vinyl acetate) is used as an adhesive. This is because the melting points of polyester and EVA differ greatly, and the polyester hardly changes even at the temperature at which EVA of the adhesive melts. The larger the difference between the melting points of these two components and the lower the melting point of the adhesive, the easier the lamination and the cheaper the heating device can be without strict temperature control.

Of course, even if the above conditions are satisfied, it is inconvenient to handle if the adhesive is tacky at room temperature, and if the transparency is poor, the printed matter inside is good. There are drawbacks such as invisibleness, and the above two components which do not have these drawbacks are currently adopted.

[0005]

However, although polyester has a high melting point, it is hard and poor in flexibility, and when printed matter is laminated, it becomes plate-like and cannot be rolled or folded. In particular, this method of lamination cannot be adopted because large printed matter and the like must be rolled and conveyed. Further, in a book such as a book that extends over many pages, it is very difficult to see and handle in a plate shape.

Therefore, it is conceivable to use a film that is softer than polyester, but most of them have a melting point close to that of the adhesive, and unless the temperature is controlled very precisely, the base film itself softens and becomes wrinkled. Or, on the contrary, defective adhesion may occur.

Therefore, in the industry, a printed material is laminated with a flexible base material film, and there has been a long-felt demand for a method capable of easily laminating with a conventional inexpensive laminating apparatus without the above-mentioned drawbacks.

[0008]

[Means for Solving the Problems] In view of such a current situation,
The present inventor has completed the method and protective material of the present invention as a result of diligent research, and is characterized in that the method has a melting point of 150 ° C. or lower on the back surface of a low melting point film,
Apply a hot melt adhesive with a lower melting point than this,
There is a point that two protective films having a high-melting point film having a melting point of 200 ° C. or more on the surface of the low-melting point film face each other with the adhesive side facing each other, the printed matter is sandwiched in the middle, and heated and pressed. For example, a hot-melt adhesive having a lower melting point than the low-melting-point film having a melting point of 150 ° C. or lower is applied to the back surface of the low-melting-point film, and the melting point of the low-melting-point film is 2
Protective film 2 with a high melting point film of 00 ℃ or higher
The point is that the adhesive side faces each other and only one end thereof is bonded.

Here, the low melting point film has a melting point of 15
Polyvinyl chloride (typically soft vinyl chloride) is a typical plastic film that has flexibility below 0 ° C.
However, other polymethacrylate, polystyrene, etc. can be used. Of course, it is a condition that the melting point and softening point are higher than those of the adhesive described later. This low-melting-point film is a base material for protecting printed matter, and this is the surface of the printed matter. Although it may be a normal transparent or smooth film, it may be embossed to give a solid feeling, or may be a transparent colored film. The thickness is free and is not limited depending on the required flexibility and easiness of handling.
Usually, it is about 20 to 150 μm.

The hot-melt type adhesive is one which is melted by heating and adhered by cooling and solidification, and has no tackiness before heating. Of course, all of the thermoplastic resins having such a property have relatively low melting points. Generally, the EVA described above is used. In addition, here, it is essential to have a melting point lower than the melting point of the low melting point film described above, and the combination of the two is a problem. The thickness of this adhesive layer is also free, but since it may be adhered by itself, about 20 to 50 μ is sufficient.

The optimum combination among the above-mentioned combinations is one in which soft vinyl chloride is used as the low melting point film and polyethylene is used as the adhesive.

The high melting point film has a melting point of 200 ° C. or higher and plays a role of protection when heat fusion is performed. Thus, eventually it will be removed. Polyester is preferable as the material, but not only plastic but also paper or the like can be used. Of course, since it will be removed in the future, transparency and flexibility do not matter.
On the contrary, it is preferable that the roll has a certain degree of hardness (brush) so that the whole roll is not rolled up. Although the thickness depends on the flexibility and the like, it may be about 20 to 80 μm.

The protective film is formed by laminating the above three components, that is, the adhesive, the low melting point film and the high melting point film in this order. The laminating method may be the same, and may be simply laminating or bonding.
Even if the adhesive adheres to the low melting point film as a film,
You may apply what was melted. Further, the high melting point film may be laminated on the low melting point film via an adhesive.
Of course, since it will be removed in the future, one that does not adhere strongly is used. For example, lamination through a polyethylene film or the like is preferable because it melts and exhibits a weak adhesive force. Therefore, when adhering, if the high melting point film can be peeled off (low adhesiveness), it is sufficient, but when the adhesiveness is strong, peeling treatment is preferable.

The printed matter is not limited to the printed paper, but may be any film-like matter that needs protection.

Next, the procedure of the laminating method will be described. Two sheets of the above-mentioned protective film are prepared, the adhesive side faces each other, the printed matter (usually made of paper) is sandwiched therein, and passed through a heating roll. The heating roll may be one commercially available as a laminating device.
When heated, the adhesive inside melts, bonds the paper and the low-melting point film, and bonds the low-melting point films to each other in the part where there is no paper (usually the surrounding frame part).

At this time, the low melting point film and the adhesive have similar melting points and softening points, but the outer high melting point film protects the low melting point film and prevents softening of the low melting point film due to local heating or high temperature at the start. To do. Of course, there is no problem with adhesion because the temperature is high enough to melt the adhesive.

Next, the protective material of the present invention will be described. The protective material here is the same as the above-mentioned protective film, but the protective film sandwiched between the upper and lower parts is adhered at one end portion. By doing so, it is possible to save the labor of arranging the upper and lower protective films when laminating, and improve the work efficiency.

[0018]

The present invention will be described in more detail with reference to the embodiments shown in the drawings. FIG. 1 shows a cross section of a protective film 1 used in the method of the present invention. E as the adhesive 3 on the inner surface of the low melting point film 2 which is a soft vinyl chloride film having a thickness of 90 μm.
VA is applied to a thickness of 25 μm. Further, a high melting point film 5 made of polyester is laminated on the outer surface of the low melting point film 2 via a polyethylene 4 having a thickness of 20 μ.
The thickness of this polyester 5 is 25 μm.

FIG. 2 is a sectional view showing a case where the printed matter 6 is sandwiched by using the two protective films shown in FIG. The adhesive layer 3 of both sheets is directed to the printed matter 6 side. This is pressed and heated and fused by a pressing and heating tool such as a heating roll. Figure 3
Indicates the end of fusion. In FIG. 4, the high melting point film 5 on the outermost surface is then peeled off. The peeling may be performed at any time, or just before the actual use.

FIG. 5 is a sectional view showing the outline of the protective material 7 of the present invention. The protective film 1 described above is adhered only at one end 8 on the same side as in FIG. Since it is not necessary to align the upper and lower protective films 1, the labor can be saved.

FIG. 6 is a plan view of the printed matter 6 held therebetween. The shaded area is the printed matter 6, and the surrounding area 9 is the area where the upper and lower low melting point films are bonded together.

[0022]

The method of the present invention has the following advantages. It is possible to use an adhesive having a melting point of the base film very close to that of the base film. Therefore, a flexible film having a low melting point can also be used, and the printed matter after lamination is not in a plate shape, and a flexible finish is possible. Since the conventional laminating machine can be used as it is,
In the case of laminating, the same method as the conventional method can be used. Since the high melting point film automatically remains on the surface, the high melting point film serves as a protective layer until it is finally used.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a protective film of the present invention.

FIG. 2 is a sectional view showing one step of the method of the present invention.

FIG. 3 is a cross-sectional view showing one step of the method of the present invention.

FIG. 4 is a cross-sectional view showing a state where a high melting point film used in the present invention is peeled off.

FIG. 5 is a cross-sectional view showing an example of the protective material of the present invention.

FIG. 6 is a plan view of an article laminated by the method of the present invention.

[Explanation of symbols]

 1 Protective Film 2 Low Melting Point Film 3 Adhesive 4 Adhesive 5 High Melting Point Film 6 Printed Material 7 Protective Material 8 One End 9 Peripheral

Claims (2)

[Claims] 1. A low melting point film having a melting point of 150 ° C. or lower is coated with a hot melt adhesive having a lower melting point than the low melting point film, and a high melting point film having a melting point of 200 ° C. or higher is applied to the surface of the low melting point film. A method of laminating a printed material, which comprises placing two printed protective films with their adhesives facing each other, sandwiching the printed material in the middle, and heating and pressing. 2. A low melting point film having a melting point of 150 ° C. or lower is coated with a hot melt adhesive having a lower melting point than the low melting point film, and a high melting point film having a melting point of 200 ° C. or higher is applied to the surface of the low melting point film. A protective material for laminating printed matter, characterized in that the two protective films attached are faced to each other on the adhesive side and only one end thereof is adhered.