JPH0376632A - Formation of transparent window through paper face - Google Patents

Abstract

PURPOSE:To make it possible to form a transparent window part without steps by forming a thermoplastic transparent resin layer on a face of a transparent resin film and laminating it on a paper face so as to face the transparent resin layer and a paper face window or nipping the paper face between upper and lower transparent resin films and heating and pressing mutually both films and the paper. CONSTITUTION:A thermoplastic transparent resin layer 3 is formed on a transparent resin film 2 and on the other hand, a window 11 is opened through a paper face 1. Then, the paper face 1 and the transparent film 2 are laminated so as to face the window 11 and the transparent resin layer each other and the transparent resin layer 3 is filled in the window 11 by heating and pressing mutually the paper face 1 and the transparent film 2. In addition, the transparent film 2 is heat-adhered on the paper face 1 to form a transparent window part 4. The transparent resin layer 3 is deformed and flows by heat and filled in the paper face window 11 and the transparent resin film 2 is heat-pressed and adhered on the paper face 1. The transparent window part 4 without steps is formed thereby.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method for forming a transparent window on a paper surface, and particularly relates to a method for forming a transparent window on a paper surface that can be used as an address display section on a secret postcard, an envelope, etc. It is something.

(Prior art) With the rapid spread of computers, 041! is also used in various service industries. For example, banks tend to automatically print postcards and other confidential matters, such as transfer notices, and send them out. In this case, the problem is how to maintain the secret.

Recently, various so-called secret postcards have been proposed that secure printing/writing area and protect privacy.
Fold a sheet of paper twice the size of a regular postcard in half, or stack two regular postcards and glue them together with a removable adhesive sticker between them to make them the same size as a regular postcard. , or ■ Use paper that has been pre-filled with heat-sensitive adhesive, fold the paper twice the size of a regular postcard in half, and use a hot roll to releasably adhere it to make it the same size as a regular postcard. Some postcards are designed to ensure printing/writing area and protect privacy.6 However, in conventional postcards of this type, the addressee is on the front and the notification information is on the back. When automatically printing using a computer's printer device, it is necessary to print the address and notification items twice, and if the notification items are confidential matters such as bank transfer notices, etc. Confirmation of addresses and contact information is complicated, and the system is unsuitable for automatically printing a large number of different types of postcards.

In contrast, the inventor of the present invention folded the postcard body, which is twice the width of a normal postcard, into two, and used a predetermined part of one half of the inner surface as the destination surface, and the remaining half and the other half as the printing/writing surface. At the same time, a transparent part is formed to overlap the destination surface of the postcard body, and a first adhesive is applied around the entire outer edge of the inner surface, and a second adhesive with low peel strength is applied to the entire inside surface. We developed a postcard that was coated with each layer, folded the postcard body in half, and adhered to the postcard in a removable manner, and also made the address side and the printing/writing side the same surface, making it easy to print automatically using a printer device. , has been filed.

By the way, when manufacturing the above-mentioned postcard, it is important how to form the transparent part of the postcard body.

Conventionally, as a method for forming a transparent window portion on a paper surface such as a sealed letter, there is a method of opening a window in the paper surface and pasting a transparent synthetic resin film on the front or back surface of the window.

(Problem to be Solved by the Invention) However, in the above conventional method for forming a transparent window part, a level difference is created by the thickness of the paper surface, and when such a method is applied to the production of postcards as described above, regulations concerning postcards of the Ministry of Posts and Telecommunications are applied. There is a problem with violating the rules.

In view of these conventional problems, it is an object of the present invention to provide a method for forming a transparent window on a paper surface, which forms a transparent window without a step.

(Means for Solving the Problems) Therefore, the method for forming a paper surface transparent window portion according to the i-th invention of the present application is as follows: ``Formation of a thermoplastic transparent resin layer approximately the thickness of the paper surface on one surface of a transparent resin film of a predetermined thickness. On the other hand, a window is made in the paper surface, the paper surface and the transparent film are stacked so that the window and the transparent resin layer face each other, and the paper surface and the transparent film are heated and pressed together to form the transparent resin layer as described above. The transparent film is filled into the window and is thermally bonded to the paper surface to form a transparent window."

Further, the method for forming a transparent window on a paper surface according to the second invention of the present application is as follows: ``A thermoplastic transparent resin layer thinner than the thickness of the paper surface is formed on one side of a transparent resin film of a predetermined thickness, and a window is formed on the paper surface. The paper surface is sandwiched between a pair of upper and lower transparent films, with the window and the transparent resin layer facing each other, and the upper and lower transparent films are heated and pressed together to fill the transparent resin layer into the window, and the window is filled with the transparent resin layer. The gist of this paper is that a transparent film is thermally bonded to the surface of the paper to form a transparent window.

Here, the paper surface may be of any type as long as it has a transparent window, such as a secret postcard or sealed letter.

Further, the transparent resin film may be any transparent film, and for example, a transparent polyester film can be used. In this case, the thermal adhesiveness of the transparent polyester film may be determined by coating the film itself with a thermoplastic resin, or by using a transparent thermoplastic resin layer to impart thermal adhesiveness. Any material may be used as long as it deforms and flows when heated and pressed; for example, soft transparent polyethylene can be used.

Further, the thickness of the transparent resin film may be determined depending on the purpose of the paper surface, and for example, in the case of postcards, it may be 12 to 16 μm thick.

Further, for heating and pressing the transparent resin film and the transparent resin layer, a hot press mold having a flat pressing surface or a heating roll may be used, but it is preferable to use a press mold with a mirror finish.

(Function) In the invention of the present application, a thermoplastic transparent resin layer is formed on one side of a transparent resin film, and this is stacked on the paper surface with the transparent resin layer and the paper surface window facing each other, or the upper and lower transparent resin films Since the paper is sandwiched between them and the two are heated and pressed together, the transparent resin layer deforms and flows due to the heat and is filled into the window of the paper, and the transparent resin film is thermocompressed onto the paper, thus eliminating the difference in level. This results in the formation of a transparent window portion with no visible edges.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

1 to 6 are process diagrams for explaining a method of forming a transparent window on a paper surface according to an embodiment of the present invention. In FIG. Opened window, 2 is a transparent polyester film (transparent resin film) having a thickness of 12 to 16 μm, 3 is a soft transparent polyethylene layer (thermoplastic transparent resin layer) provided on the back side of the transparent polyester film 2, 4 is a forming 5.6 is the first and second heat sealing agent, 7 is a processing table whose surface is mirror-finished, 8 is a heating roll, and 9.10 is a ξ-thin.

Next, the formation method will be explained.

When forming this transparent window part, first, a transparent polyester film 2 with a thickness of 12 to 16 μm is produced, and a transparent polyethylene layer 3 of 50 to 100 μm, which is approximately the thickness of a postcard paper, is coated on the back side of the film 2. (see FIG. 1), and cut it approximately to the size of the window 4 to be formed.

Further, using equipment such as a press machine, a window 11 of a predetermined size is opened in a predetermined portion of the postcard sleeve 1 (see FIG. 2).

Next, the postcard paper 1 is placed on the processing table 7, and the transparent polyester film 2 is placed on top of it with the window 11 and the transparent polyethylene layer 3 facing each other, and heated and pressed with the heating roll 8 on top of it (the first 3), the transparent polyethylene layer 3 deforms and flows into the window 11 of the postcard paper l due to heat and pressure and is filled into the window 11, and the transparent polyester film 2
The transparent window portion 4 is formed in the postcard paper 1 by thermo-compression bonding to the postcard paper 1 due to its thermal adhesive property (see Fig. 4).
. Furthermore, a transparent polyester film 2 may be bonded by heat and pressure to the back side of the paper surface 1, or the thickness of the transparent polyethylene layer 3 may be approximately halved, a postcard cover 1 is sandwiched between the upper and lower transparent polyester 2, and this is bonded by heat and pressure. You may also do so.

Thereafter, a first heat sealing agent 5 having a predetermined peel strength, for example, 100 to 200 g at 15 mm'' is applied to the outer edge of each half of the postcard paper 1, and a second heat sealing agent having a lower peel strength is applied on the inside thereof. Apply heat sealant 6 (see Figure 5), set this in a computer printer, etc., and write the address on the area facing the window 4 on the inside surface of the postcard holder 1, and write the specified information on the remaining area. After automatic printing, the desired postcard can be obtained by folding the postcard paper 1 in half and heat-sealing it using a heat-sealing machine (see FIG. 6).

In the method for forming the transparent window section of this embodiment as described above, the transparent polyester film 2 is pressed onto the postcard paper by the heat adhesive properties of the transparent polyethylene layer 3, and the transparent polyethylene layer 3 is deformed and fluidized by heat. Postcard paper 1 window 1
Since the transparent window portion 4 is filled within the postcard paper 1, a transparent window portion 4 without a step can be formed on the postcard paper 1, and as a result, a secret postcard meeting the regulations of the Ministry of Posts and Telecommunications can be manufactured.

In addition, a first heat sealing agent 5 that cannot be peeled off is applied to the outer edge of the postcard envelope 1, a second heat sealing agent 6 with low peel strength is applied to the inside of the first heat sealing agent 5, and a U-shaped seal is formed on the back side along the outer edge. It is also possible to make a U-shaped cutout so that only about 2/3 of the postcard, leaving the address, can be removed by peeling off the postcard cover 1 from the cutout 9. It is also possible to insert a perforation IO (see Fig. 5).

(Effects of the Invention) As described above, according to the present invention, a thermoplastic transparent resin layer is formed on one side of a transparent resin film, and this is stacked on a paper surface with the transparent resin layer and the paper window facing each other. Alternatively, since the paper surface is sandwiched between the upper and lower transparent resin films and the two are heated and pressed against each other, it is possible to form a transparent window portion without a step.

[Brief explanation of drawings]

1 to 6 are process diagrams for explaining a method of forming a paper transparent window according to an embodiment of the present invention, FIG. 1 is a sectional view showing a transparent polyester film and a transparent polyethylene layer, and FIG. 2 is a sectional view showing a transparent polyester film and a transparent polyethylene layer. 3 is a sectional view showing the postcard paper, FIG. 3 is a sectional view showing the heating and pressing process, FIG. 4 is a sectional view showing the formed transparent window, FIG. 5 is a front view showing the postcard paper before adhesion, and FIG. Figure 6 is a front view of the completed postcard. 1...-Postcard paper (paper surface Lll---window, 2--
-.=.-Transparent polyester film, 3.--.Transparent polyethylene layer, 4.--Transparent window section.

Claims (2)

[Claims] (1) While forming a thermoplastic transparent resin layer 3 of approximately the paper thickness on one side of a transparent resin film 2 having a predetermined thickness, a window 11 is opened in the paper surface 1, and the paper surface 1 and the transparent film 2 are connected to each other through the window. 11 and the transparent resin layer 3 are stacked facing each other, and the paper surface 1 and the transparent film 2 are heated and pressed together to form the transparent resin layer 3.
A method for forming a transparent window section on a paper surface, characterized in that the transparent window section 4 is formed by filling the window 11 with the transparent film 2 and thermally adhering the transparent film 2 to the paper surface 1. (2) A thermoplastic transparent resin layer 3 thinner than the paper surface thickness is formed on one surface of the transparent resin film 2 having a predetermined thickness, while the paper surface 1
A window 11 is opened in the paper surface 1, and the window 11 is placed between the pair of upper and lower transparent films 2.
1 and the transparent resin layer 3 facing each other, the upper and lower transparent films 2 are heated and pressed together to fill the transparent resin layer 3 into the window 11, and the transparent film 2 is placed on the paper surface 1. A method for forming a transparent window section on a paper surface, characterized in that the transparent window section 4 is formed by thermal bonding.