JPS61168682A - Method of bonding paper - Google Patents

Abstract

PURPOSE:To simply and instantly bond paper, by abutting edges of two sheets of paper and laying the resin surface of hot-melt resin single-side laminated paper on top of one side of each of the both sheets across the abutted edge, followed by heating and pressing. CONSTITUTION:A resin such as polyethylene or an ethylene/vinyl acetate copolymer which is heat-fusible and exhibits bonding ability when cooled and solidified, is applied in a state of a melt or soln. to paper to prepare hot-melt resin single- side laminated paper 3. Then two sheets of paper 1, 1' are bonded by abutting straight edges of the sheets of paper 1, 1' to be bonded and laying the resin surface of the hot-melt resin single-side laminated paper 3 on top of one side of each of the both sheets of paper 1, 1' across the abutted edge 2., followed by pressing and heating by using a heat sealer, etc. It is also possible to bond paper by laying the edge of one sheet of paper on top of that of another sheet of paper across a tape-like hot-melt resin followed by pressing and heating.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a method for gluing paper ties.

(Conventional technology and problems) Many methods of bonding paper have been known.

The most commonly used method at home is to apply a water bathing solution of a water-based sizing agent such as starch, gum arabic, or polyvinyl alcohol to adhered paper pieces, knead the paper, and dry.

This method has drawbacks such as drying time and the deformation of the paper strips due to water, making it difficult to implement industrially, and it is not possible to bond TFI paper whose surface has been treated with water-resistance treatment or gloss treatment. First, it has poor water resistance and tends to peel off when wet.

A simple method is to butt or overlap pieces of paper and apply pressure to adhere paper, cloth, such as cellophane tape or duct tape, that has an adhesive layer on one side across the joint.
It is often used at home because it is an instant adhesive, but since it is adhesive in nature, the adhesive part will wear out over time.

In addition to aging and peeling, it also has the disadvantage of easily peeling off when exposed to organic bath vapor. Instead of adhesive, it is also practical to use gummed tape coated with a water-bathable adhesive such as polyvinyl alcohol, which is wetted and pasted before use. Although this method does not have the disadvantages mentioned above, it requires the operation of soaking it in water and is complicated. And, as with the above, it has the same drawbacks that make it unusable even though it has been subjected to water resistance treatment, gloss treatment, etc.

Recently, a method of adhering moths using heat bath meltable resin (hot melt) has been widely used industrially. This is a method mainly used in the field of bookbinding, in which molten resin is applied to the edges of many sheets of paper stacked one on top of the other, and the sheets are cooled and solidified to be bonded together.

This method is extremely suitable for bookbinding, etc., but it is difficult to use for gluing paper pieces together in a two-dimensional manner, and this method requires relatively large-scale equipment such as a resin melt coating equipment. There is a problem that requires it.

Furthermore, a method of using paper coated or laminated with a hot-melt resin and gluing such papers together, or adhesively sealing the paper into a bag shape is also widely practiced. Although this method provides instant adhesion and is industrially advantageous, it can only be applied to paper coated with a hot-melt resin in advance, and cannot be applied to any paper. In addition, since this method can only bond by overlapping, if the paper is thick, the thickness of the bonded portion may become large, which may be inconvenient.

The present invention aims to improve these drawbacks and provide a method for simply bonding any paper.

(Structure and Effects of the Invention) The present invention is characterized in that the linear edges of paper strips are abutted against each other, and the resin surface of the thermofusible resin single-sided laminated paper is overlaid on one side of both paper strips, spanning both sides of the abutted portions. ``A bonding method for bonding paper that is characterized by applying pressure and heat at the same time'' and ``A tape-shaped hot bath meltable resin is sandwiched along the straight edge of paper pieces, and the paper pieces are overlapped and pressed together. ``A bonding method for bonding paper that involves heating.''

According to the method of the present invention, the following effects can be obtained. (1)
The paper piece to be adhered to can be applied not only to ordinary unprocessed paper, but also to glossy treated paper, water-resistant treated paper, etc., and is not limited to paper coated with an adhesive. (2) According to the first invention, it is possible to join by butting, and if the adhesive paper piece (the above-mentioned hot-melt resin single-sided laminated paper) is appropriately selected, the increase in the thickness of the adhesive part can be reduced. is possible. (3) Instant bonding is possible. (4) By using a heat sealer, it can be easily and inexpensively bonded both industrially and at home.

(5) In general, it is possible to bond with excellent water resistance and solvent resistance, and it does not peel off even in a solvent atmosphere. As an adhesive method for joining papers together, there has been no known method that combines the above-mentioned effects.

The heat-fusible resin single-sided laminated paper used in the first method of the present invention is a piece of paper having a heat-fusible resin layer on one side, and the paper is coated with a hot-fusible resin in the form of a melt or a tri solution. It is obtained by applying it to paper by suitable means. The tape-shaped thermofusible resin used in the second method can be produced from a thermofusible resin film by an appropriate means.

The heat-melting resin used in the present invention includes polyethylene, polypropylene, ethylene-vinyl acetate copolymer (
EVA), petroleum resin, etc. may be used as long as they exhibit a bonding ability when melted in a bath by heat and solidified by cooling, but polyethylene and EVA are preferable.

The above-mentioned thermofusible resin single-sided laminated paper (adhesive paper piece) used in the first method of the present invention and the above-mentioned tape-shaped thermofusible resin (resin flake) used in the second method of the present invention The thickness of the t/'i resin layer is preferably about 10 to 50 μm, but it is not limited to this range. The above-mentioned adhesive paper pieces and resin thin pieces should each be placed at the bonding site with a width (usually about 3 to 20 mm) that is sufficient to develop sufficient adhesive strength between the two materials to be bonded, and the length should usually correspond to the length of the bonded area. Match, but
It is convenient to prepare a long tape and cut it to the required length each time.

A commercially available heat sealer is suitable for pressurizing and heating in the method of the present invention, and the heating temperature varies depending on the resin, but is usually 120 -
A range of 200°C is used. A particularly strong pressure is not required for pressurization; a pressure that can be applied with a heat sealer is sufficient.

Butt the short sides of the sheets together, and place a paper tape laminate 1II11 with polyethylene laminated on one side between the two sides (upper opening) of the butt part (2) on the above butt part symmetrically and heat solar. The two sheets of paper were joined together by pressure and heating (see Figures 1 and 2).

Overlap the short sides of the sheets so that the short sides are parallel, and press the ethylene vinegar vinyl copolymer (EVA) tape (5) between the two sheets of overlapped paper. Then, the overlapping portion was heated under pressure using a heat solar to join the two sheets of paper together (see Figures 3 and 4).

[Brief explanation of the drawing]

1 and 2 are explanatory diagrams of an embodiment (practical example 1) of the invention of claim 1 of the present application, in which FIG. 1 is a plan view and Figure m2 is a llll side view. 3 and 4 are the fruits of the invention of claim 2 of the present application! It is an explanatory diagram of Example i (Example 2), and the third
The figure is a flat diagram, and FIG. 4 is a side view.

Claims (1)

[Scope of Claims] 1. The linear edges of the paper strips (1, 1') are abutted against each other, and one side of the paper strips is covered with heat-melting resin single-sided laminated paper, straddling both sides of the abutted portion (2). (3) A bonding method for bonding paper, characterized in that the resin surfaces of (3) are overlapped and heated under pressure. 2 Adhesive for bonding paper, characterized by sandwiching a tape-shaped hot-melt resin (5) along the straight edges of pieces of paper (4, 4'), overlapping each other and heating under pressure. Method.