JP2000158407A - Production of plywood having orthogonal paper board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a plywood having orthogonal paper boards in which a warpage and a twist are solved and the tough plywood having orthogonal paper boards is continuously produced. SOLUTION: Paper boards 5a, 5b for a center core have cross grain direction fiber orthogonal to grain direction fiber of lead paper 3a, 3b on the long-sized lead paper 3a, 3b having grain direction fiber in the lengthwise direction. The paper boards 5a, 5b for the center core are cut into prescribed length and stuck in parallel in the lengthwise direction of the lead paper 3a, 3b. Both the paper boards 5a, 5b for the center core which are stuck to each lead paper 3a, 3b, are rewound from two paper board coils 8a, 8b for a center core so that the connected parts disagree and come into contact with each other. Surface paper boards 9a, 9b which have the grain direction fiber in the lengthwise direction and are rewound from two paper board coils 8a, 8b for the center coil, are stuck to the faces of each lead paper 3a, 3b. Such the plywood having orthogonal paper boards is produced that two sheets of lead paper 3a, 3b layers of grain direction fiber and two sheets of paper boards 5a, 5b layers for the center core having cross grain direction fiber are interposed between two sheets of surface paper boards 9a, 9b having the grain direction fiber.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a paperboard orthogonal plywood.

[0002]

2. Description of the Related Art In various box-shaped containers and housing construction materials,
BACKGROUND ART A paperboard plywood or a veneer plywood composed of a plurality of layers obtained by stacking and bonding a plurality of paperboards is used.

[0003]

In the conventional paperboard plywood, the paperboard of each layer is all in one direction of the longitudinal fibers. When the paperboard of each layer is overlapped with the longitudinal fibers and the transverse fibers perpendicular thereto, as in a plywood board, a tough paperboard plywood is obtained by the intersecting fibers, but the moisture and expansion and contraction rate of the paperboard in each layer are not uniform,
There was a problem that warping and twisting occurred. In addition, there is a difficulty in production efficiency because a manufacturing method using a flat plate having a required length and width must be used.

[0004] It is an object of the present invention to eliminate warpage and twist.
An object of the present invention is to provide a method for manufacturing a paperboard orthogonal plywood which enables continuous production of a strong paperboard orthogonal plywood by a coil method.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to a method of winding a lead paper coil in which a long lead paper having longitudinal fibers is wound on a lead paper winding roll. On the returned lead paper, the core paper having a cross-fiber perpendicular to the longitudinal fiber of the lead paper and being cut into a predetermined length is adhered in parallel in the rewind traveling direction of the lead paper, and the lead paper is adhered. This is wound on a core paperboard take-up roll to produce a core paperboard coil, and the connecting part connects the core paperboards bonded from the two core paperboard coils to the respective lead papers. Rewind so that they are in contact with each other, and glue a surface paperboard with longitudinal fibers rewound from the surface paperboard coil to each lead paper surface, between at least two surface paperboards of longitudinal fibers. Two lead papers of longitudinal fiber Is characterized in that to produce a paperboard orthogonal plywood core paperboard layer is interposed in the two courses fibers and.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. First, as shown in FIG. 1, a core paperboard coil 8 which is an important element of the present invention is manufactured. The production of the core paperboard coil 8 is performed by rewinding the lead paper 3 unwound from the lead paper coil 1 in which a long lead paper 3 having longitudinal fibers is wound on the lead paper take-up roll 2. An adhesive is applied to the upper surface with an adhesive roll 4 to hold the transverse fibers perpendicular to the longitudinal fibers of the lead paper 3, and the core paperboard 5 cut to a predetermined length to rewind the lead paper 3. Then, the core paperboard 5 is pressed against the lead paper 3 by the press roll 6 and securely bonded to the core paperboard take-up roll 8, and the core paperboard is wound around the core paperboard take-up roll 8. The paperboard coil 8 is manufactured.

[0007] Next, the paperboard orthogonal plywood of the present invention is manufactured using the above-mentioned core paperboard coil 8. A method for manufacturing this paperboard orthogonal plywood will be described with reference to FIG. In FIG. 3, from the left end, a first surface paperboard coil 9a, a first middle paperboard coil 8a,
The second middle paperboard coil 8b and the second surface paperboard coil 9b are arranged in parallel. Each of the first surface paperboard coil 9a and the second surface paperboard coil 9b is provided with first and second surface paperboard coils 10 having longitudinal fibers in the longitudinal direction similarly to the lead paper 3.
a and 10b are wound up.

The first core paperboard coil 8a is arranged so that the core paperboard 5a on the first lead paper 3a is rewound upward, and the second core paperboard coil 8b is disposed on the second lead paper 3a.
The core paperboard 5b on b is arranged to be rewound downward.

An adhesive is applied to the upper surface of the first surface paperboard coil 10a unwound from the first surface paperboard coil 9a by an adhesive roll 11, and the first middle paperboard coil 8a is applied to the upper surface of the first surface paperboard coil 10a. The first lead paper 3a, which has been rewound from, is joined and joined, and an adhesive is applied to the first core paperboard 5a on the first lead paper 3a by the adhesive roll 12.

[0010] The second core paperboard 5a is unwound from the first core paperboard coil 8a, and the second core paperboard 5a is directed upwardly on the first lead paper 3a on which the adhesive is applied by the adhesive roll 12. The downward facing second core paperboard 5b on the second lead paper 3b unwound from the coil 8b is joined and joined to bond the first core paperboard 5a and the second core paperboard 5b. When the first core paperboard 5a and the second core paperboard 5b are joined and joined, a phase difference is provided so that the respective connected ga and gb portions are staggered.

The second lead paper 3b unwound from the second core paperboard coil 8b is coated with an adhesive by an adhesive roll 13, and the second surface paper unwound from the second surface paperboard coil 9b is applied thereto. The paperboards 10b are joined together and bonded.

After the second surface paperboard 10b unwound from the second surface paperboard coil 9b is joined and bonded to the second lead paper 3b unwound from the second core paperboard coil 8b, the press roll 14 is pressed. To press the first surface paperboard 10a,
First lead paper 3a, first core paperboard 5a, second core paperboard 5
b, the second lead paper 3b and the second surface paperboard 10b are superposed and integrated, and are cut to a desired length by a cutter 15 to continuously manufacture a flat paperboard orthogonal plywood 16.

As shown in FIG. 4, the paperboard orthogonal plywood 16 is composed of two longitudinal fiber first and second surface paperboards 10a, 10a.
b, two first and second lead papers 3a, 3
Two first and second core paperboards 5a and 5b of a b-layer and a weft fiber
There are six superposed layers with layers interposed therebetween, and furthermore, the connection ga,
The paperboard orthogonal plywood 16 has a form in which the seams of the gb portions are staggered.

Accordingly, the paperboard orthogonal plywood 16 manufactured according to the present invention is made of the first and second surface paperboards 10a, 10a,
10b, the first and second lead papers 3b, 3b, and the first and second core paperboards 5 of the horizontal fibers orthogonal to the vertical fibers.
a, 5b, polymerized in different fiber directions,
It is possible to obtain a tough paperboard orthogonal plywood in which warp and twist are suppressed by warp and transverse fibers, warping and twisting due to temperature and humidity are prevented, change over time is prevented, and directional strength is uniform.

The core paperboard 5 is bonded to the core paperboard 5 cut into a predetermined length on the lead paper 3 in parallel in the rewinding traveling direction of the lead paper 3 and connected by the lead paper 3. g
Therefore, the winding by the core paperboard winding roll 8 is facilitated, and the papermaking width (side line) is arbitrarily limited, and the production of the core paperboard coil 8 without loss can be realized.

Further, since all the coil-shaped materials of the core paperboard coil and the surface paperboard coil are used, the respective materials are polymerized and adhered and integrated by rewinding each of the coils to produce a paperboard orthogonal plywood 16, as in the prior art. Compared to the production by the flat plate polymerization bonding, the production can be performed much more efficiently, and the cost can be reduced.

The paperboard orthogonal plywood 16 manufactured according to the present invention.
Is subjected to water resistance, disaster prevention, oil resistance, etc. as necessary, and is provided as a tough, warp-free or twist-free material for building materials such as various packaging boxes, signboards, wall boards, ceiling boards, furniture backing boards, picture frames, etc. can do.

In the above embodiment, the paperboard orthogonal plywood 16 is formed by the two first and second surface paperboards 10a and 10b. However, the surface paperboard may have two or more layers each if necessary. It is optional.

[0019]

As described above, according to the present invention, it is possible to manufacture a paperboard orthogonal plywood by a coil method, which has not been conventionally obtained, and to suppress the expansion and contraction of each polymer layer by orthogonal polymerization of longitudinal fibers and transverse fibers. In addition, there is an advantage that a strong paperboard orthogonal plywood without warping or twisting due to humidity or the like can be continuously produced with high efficiency, and cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a side view showing the manufacture of a core paperboard coil.

FIG. 2 is a plan view of a main part of FIG. 1;

FIG. 3 is a side view showing the manufacture of a paperboard orthogonal plywood.

FIG. 4 is an enlarged sectional view of a paperboard orthogonal plywood manufactured by the method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lead paper coil 2 Lead paper take-up roll 3 Lead paper 3a 1st lead paper 3b 1st lead paper 5 Core paperboard 5a 1st core paperboard 5b 2nd core paperboard 7 Core paperboard take-up roll 8 Core paperboard coil 8a first core paperboard coil 8b second core paperboard coil 9a first surface paperboard coil 9b second surface paperboard coil 10a first surface paperboard coil 10b second surface paperboard 16 paperboard orthogonal plywood

 ──────────────────────────────────────────────────続 き Continued on front page F-term (reference) 2B200 AA07 BA10 BA17 BB01 BB07 BB15 BB20 CA02 CA03 EE13 EF35 FA07 FA10 FA15 FA27 4F100 BA05 BA06 BA10A BA10E DG10A DG10B DG10C DG10D DG10E EC18 EC182 J02 GB02 GB08

Claims (1)

[Claims] 1. A method according to claim 1, wherein the lead paper winding roll has a length of lead paper having longitudinal fibers in the longitudinal direction wound on a lead paper coil. The core paperboard having crossed fibers which are orthogonal to each other and cut to a predetermined length is bonded in parallel in the rewinding and running direction of the lead paper and connected by the lead paper, and this is wound around a core paperboard take-up roll. The core paperboard coil is manufactured by taking the two core paperboard coils, and the core paperboards bonded to the respective lead papers are rewound so that the connecting portions are in contact with each other, and the respective core paperboard coils are wound on the respective lead paper surfaces. Adhering the surface paperboard having the warp fibers in the longitudinal direction unwound from the surface paperboard coil, two lead paper layers of the warp fibers and two of the weft fibers between at least two face paperboards of the warp fibers Paperboard with a middle core paperboard layer interposed Method of manufacturing a paperboard plywood, characterized in that to produce the mating plate.