JP2001138286A - Sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet of perforated structure capable of separating certainly along the division line provided previously while each divided unit of article is equipped with a sufficient waterproofness and strength. SOLUTION: The sheet designed to be divided is formed by laminating a paper layer 3 and synthetic resin layer 4, wherein the perforated structure of the division line consists of a perforation 1 penetrating the sheet across the thickness and continuous notches 2 having uniform depth approximately penetrating only the synthetic resin layer 4 across its thickness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet which is divided into a plurality of sheets.

[0002]

2. Description of the Related Art Today, there are various types of sheets provided with a perforated structure and presupposed to be divided, such as continuous paper used for printing on computer systems and the like, and postal matter such as postcards and envelopes. Among them, there are also articles that are sensitive to moisture and articles that need to secure sufficient strength for each divided unit, such as forming a sheet from a synthetic resin that is resistant to moisture, In many cases, a sheet made of a material such as paper is further polymerized with a woven or nonwoven fabric using synthetic resin fibers or a reinforcing layer using a sheet material (including a laminate layer).

[0003]

However, since the sheet itself has a direction in which the sheet is apt to be cut, the sheet may be deviated from the dividing line where the perforation is formed, and
In the case where the reinforcing layer is polymerized as described above, even if perforations are formed, the presence of the reinforcing layer maintains the strength of the dividing line, and it may be difficult to separate without using a tool. is there. If an attempt is made to forcibly divide the fibers or the like constituting the reinforcing layer in an irregular arrangement, a problem may occur in which a break is generated in an unexpected direction by diverging from a dividing line that should be originally separated.

[0004] The present invention has been made in view of the above-mentioned circumstances, and it is possible to ensure sufficient water resistance and strength for each of one unit of a divided product while maintaining a predetermined dividing line along a predetermined dividing line. It is an object of the present invention to provide a sheet having a perforated structure that can be reliably divided.

[0005]

A first sheet according to the present invention, which has been made to solve the above-mentioned problems, is a sheet presupposed to be divided into a plurality of sheets. And a perforated structure formed by forming both continuous perforations that penetrate the sheet and continuous cuts having a uniform depth that does not reach the thickness of the sheet. The sheet may be a sheet having a single-layer structure or a sheet having a multi-layer structure.

A second sheet, which is an example of a multi-layer structure sheet, is a sheet premised on division formed by superposing a paper layer and a synthetic resin layer, and penetrates the sheet in the thickness direction with respect to a division line. A perforation structure formed by forming both perforations and continuous cuts having a uniform depth substantially penetrating only the synthetic resin layer in the thickness direction; In a sheet premised on division formed by polymerizing a layer and a synthetic resin layer, only perforations penetrating the sheet in the thickness direction and only the synthetic resin layer were continuously made brittle with respect to the dividing line. It has a perforation structure formed by forming both of the fragile portions.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a sheet according to the present invention as a continuous sheet will be described below with reference to the drawings. The first embodiment shown in FIG. 2 is a synthetic resin sheet,
For example, a dividing line having a perforated structure is formed such that a document of a predetermined style having a certain width and a certain length is connected to a polypropylene sheet. The perforation structure in this example has a perforation 1 of a predetermined length at a predetermined interval, for example, 1 mm with a 2 mm interval.
A perforation 1 in which a long cut is formed is provided, and a cut 2 is uniformly formed along the perforation 1 over a depth of half the thickness of the polypropylene sheet.

As means for forming such perforations 1 and cuts 2 (means for forming a perforated structure), as shown in FIG.
And a perforated structure forming apparatus having rotary blades 8 in which the inner blades 7 for making the cuts are formed alternately.
As shown in FIG. 6, a method of simultaneously forming the perforations 1 and the cuts 2, a continuous blade 9 (FIG. 6A) for making the cuts 2 in the peripheral edge of the disk, and the perforations 1 in the peripheral edge of the disc
There is a method in which perforations 1 and cuts 2 are separately formed by using a perforated structure forming apparatus in which the intermittent blades 10 (FIG. 6B) are arranged in front and behind. When the perforations 1 and the cuts 2 are formed separately in this manner, the cuts 2 may be formed more conveniently when the rotation speed of the continuous blade 9 is sufficiently faster than the sheet feeding speed. Whether the perforations 1 are formed first or the cuts 2 are formed first may be determined according to the properties of the material.

In the second embodiment shown in FIG. 3, a perforated structure is formed on a multilayer sheet obtained by polymerizing a paper layer 3 and a synthetic resin layer 4 as a reinforcing layer. Is a woven fabric obtained by plain weaving a flat yarn 11 made of polypropylene, and the woven fabric is adhered to the paper layer 3 with an adhesive. In the perforated structure of this example, a perforation 1 penetrating the sheet in the thickness direction with respect to the dividing line, and a continuation of a uniform depth substantially penetrating only the flat yarn 11 forming the woven fabric in the thickness direction. Cut 2
Are formed, and desirably, the cuts 2 that just pass through only the synthetic resin layer 4 made of
However, it is not possible that there is a part that does not partially penetrate the woven fabric or a part where the cut 2 reaches the paper layer 3. The method for forming the perforated structure in the present embodiment is the same as that in the first embodiment.

In a third embodiment shown in FIG. 4, a perforated structure is formed on a multilayer sheet obtained by polymerizing a paper layer 3 and a synthetic resin layer 4 as a reinforcing layer. The basic structure including the configuration is the same as that of the second embodiment, but the perforation structure is different. That is,
The perforated structure according to the third embodiment includes a perforated line 1 penetrating the sheet in the thickness direction with respect to the dividing line, and a fragile portion 5 in which only the synthetic resin layer 4 is linearly and continuously weakened. The fragile part 5 is formed by forming both.
The woven fabric obtained by plain weaving the flat yarn 11 made of polypropylene is heated along the dividing line. By this heating, the strength of the flat yarn 11 made of polypropylene, which is a material of the woven fabric, is deteriorated, and it becomes easier to break as compared with other portions.

As a means for forming the perforated structure, first, as shown in FIG. 7A, a perforated line 1 formed on both sides of the sheet is formed with a predetermined intermittent blade 12, and further heated to about the melting temperature of polypropylene. The peripheral edge of the disk 13 having no thin blade is applied to the synthetic resin layer 4 along the perforation 1. By this heating step, although the synthetic resin layer 4 is not divided along the dividing line, only the dividing line portion becomes extremely brittle, and the subsequent dividing is easy.
As means for forming the fragile portion 5 by heating in this way, there are means using a laser beam in addition to means using the heated disk 13, and means for providing the fragile portion 5 by other means include chemicals There is also a means of denaturing the synthetic resin layer 4 by the above method.

[0012]

As described above, when the sheet according to the present invention is used, even if the sheet itself has an easy-to-cut direction, the occurrence of a cut due to deviation from the perforated dividing line is extremely reduced, and the sheet is reinforced. Even in the case of a sheet having a multilayer structure in which layers are superimposed, the presence of the reinforcing layer does not hinder separation without using a tool. And even if the arrangement of the fibers or the like constituting the reinforcing layer is irregular, it is possible to prevent the harmful effect of diverging the dividing line that should be separated and generating a cut. In this way, the sheet according to the present invention can be surely divided along a division line provided beforehand, while ensuring sufficient water resistance and strength for each of the divided units.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a sheet according to the present invention as viewed from a synthetic resin layer side and a paper layer side.

FIGS. 2A and 2B are a cross-sectional view and a cross-sectional view taken along line AA of an example of a sheet according to the present invention, as viewed from a direction along a dividing line.

FIGS. 3A and 3B are a cross-sectional view and a cross-sectional view taken along a line BB, respectively, showing an example of a sheet according to the present invention when viewed from a direction along a dividing line.

FIGS. 4A and 4B are a cross-sectional view and a cross-sectional view taken along a line CC, respectively, showing an example of a sheet according to the present invention, as viewed from a direction along a dividing line.

FIGS. 5A and 5B are explanatory views showing an example of a means for forming a perforated structure in the process of manufacturing a sheet according to the present invention.

FIGS. 6A and 6B are explanatory views showing an example of a means for forming a perforated structure in a sheet manufacturing process according to the present invention.

FIGS. 7A and 7B are explanatory views showing an example of a means for forming a perforated structure in the process of manufacturing a sheet according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Perforation 2 Notch 3 Paper layer 4 Synthetic resin layer 5 Fragile part

Claims (3)

[Claims] In a sheet presupposed to be divided into a plurality of sheets, a perforation (1) penetrating the sheet in a thickness direction with respect to a dividing line, and a sheet having a uniform depth not reaching the thickness of the sheet. A sheet having a perforated structure formed by both continuous cuts (2). 2. A perforated sheet (1) penetrating the sheet in a thickness direction with respect to a dividing line in a sheet premised on division formed by superposing a paper layer (3) and a synthetic resin layer (4).
And a sheet having a perforated structure formed by continuous cuts (2) having a uniform depth substantially penetrating only the synthetic resin layer (4) in the thickness direction. 3. A perforated sheet (1) penetrating a sheet in a thickness direction with respect to a dividing line in a sheet premised on division formed by polymerizing a paper layer (3) and a synthetic resin layer (4).
And a sheet having a perforated structure in which both the synthetic resin layer (4) and the fragile portion (5) that is continuously made brittle are formed linearly.