JPH09323288A - Cutting method of corrugated fiberboard or the like and slitter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cut a corrugated fiberboard neatly without causing a break-like split and a flaw on a product even if the width on a trim side is reduced by using a rotary blade like saw blade having a blade on one side as a slitter knife and cutting the corrugated fiberboard, etc., by directing a rear side of the blade toward a drop side of an object to be cut. SOLUTION: A slitter knife 1 is a knife in which a blade is provided in a peripheral fringe part of a disc, is formed into a type of blade on one side, and is provided with a sawlike tooth form which has no set in a blade part and makes a line which connects blade tips one straight line. When an object to be cut 3 is fed in from a paper supply bed side in a condition in which the slitter knife 1 and an anvil roll 2 are rotated, the object to be cut 3 runs and passes between the slitter knife 1 and the anvil roll 2, and both ends thereof on the right and left are cut down by the slitter knife 1. At this time, since the slitter knife 1 is set in such a manner that a rear blade 1a thereof is directed toward the outside of a slitter A, cutting is done in a condition in which the rear of the blade 1a faces a trim 3a side of the object to be cut 3 and the front of the blade 1b faces a product side 3b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cutting corrugated cardboard and the like, and more particularly to a method for cutting the edges of a card.

[0002]

2. Description of the Related Art As a method of cutting corrugated board using a cutting device called a slitter, the corrugated board is made to pass by running it between a rotary blade and an anvil roll having a groove for receiving the cutting edge of the blade. There is a method of cutting parallel to the running direction, in this method a circular saw is used as a rotary blade, and a double-edged one that has a saw blade shape but no clams and the line connecting the cutting edges is a straight line There is.

[0003]

In the former case, that is, in the case of using a circular saw having a set as a rotary blade, by making the rotational speed of the blade extremely fast with respect to the object to be cut, the width of the blade is wider than the thickness of the blade. However, due to the feature of cutting with a wide clam width, a part of the clam width is generated as so-called sawdust, and the cutting speed cannot be so fast. On the other hand, in the latter case, that is, when using a double-edged blade having a saw blade shape but no clams as the rotary blade, and the line connecting the blade edges is a straight line, the rotation speed of the blade edge is not so fast with respect to the workpiece. If the relative speed is set, the traveling speed of the object to be cut can be cut at a considerably high speed. However, this method has a problem in that when the width of the bleeding side (hereinafter referred to as trim) becomes as narrow as 30 mm or less, a tear-like cut occurs at the end portion on the product side. In addition, the crack-like flaws that occur at the end on the product side differ in the appearance depending on the thickness of the corrugated board and the quality of the paper that it is made of, and the thicker the cardboard and the worse the quality of the paper, the more severely the breaks appear . Therefore, in order to prevent the above phenomenon from occurring, the trim width needs to be at least 30 mm or more. However, the trim of product trimming is at least 30 mm.
It is not possible to overlook the need for a loss and at least 5m
The purpose of trimming must be achieved in about m.

The present invention has been made in view of the above problems of the prior art, and an object thereof is to cut a corrugated cardboard or the like into a slit-like cut on the product side even if the width on the trim side is narrowed. The object is to prevent the generation of sawdust and the like by allowing the object to be cut to travel at a sufficiently high speed without causing the above problems.

[0005]

In order to achieve the above object, in the method for cutting corrugated board and the like of the present invention, a single-edged saw blade-shaped rotary blade as a slitter knife is used when the corrugated board or the like is cut by a slitter. Is used to cut the back of the blade toward the cut-off side of the object to be cut.

A slitter used for carrying out such a method for cutting a corrugated board has a slitter knife and an anvil roll having a groove for receiving a cutting edge of the knife so that a sheet of corrugated board or the like passes between them. At the same time, the slitter knife is set as a single-edged saw blade-shaped rotary blade, and the back of the blade is set so as to face the cutting side of the object to be cut passing between the knife and the anvil roll.

When the corrugated board is cut using the corrugated board cutting method and the slitter configured as described above,
Regardless of the size of the trim width, no crack-like cuts were formed on the product side, and even if the trim width was reduced to almost 0 mm, the above-mentioned cuts or other flaws were not formed on the product side. Therefore, the purpose of trimming can be achieved by cutting the trim width of 5 mm or less, and the loss due to trimming can be minimized.

By the way, even when a single-edged saw blade-shaped rotary blade is used as the slitter knife, when the blade surface is cut toward the trim side, the conventional double-edged saw blade type rotary blade is used for cutting. Similarly, when the trim width was 30 mm or less, a crack-like cut occurred on the product side.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In the figure, A is a slitter, 1 is a slitter knife thereof, 2 is an anvil roll, and 3 is an object to be cut such as corrugated cardboard having a three-layer structure.

The slitter A passes the object to be cut 3 such as a corrugated cardboard fed from the paper feed bed side a between the slitter knife 1 and the anvil roll 2 provided in the middle of the traveling direction, so that the object to be cut 3 The slitter knife 1 and the anvil roll 2 are attached to a frame or the like (not shown) of the slitter A, the basic structure of which is the same as that of a conventionally known slitter. It is attached and fixed to a pair of upper and lower rotary shafts 4 and 4 provided so as to intersect at right angles with the traveling direction of the object 3 traveling in the slitter A. The pair of upper and lower rotary shafts 4 and 4 for mounting the slitter knife 1 and the anvil roll 2 are interlocked with each other by an appropriate drive device (not shown) to rotate in mesh with each other in the same direction as the feeding direction of the object to be cut 3. It is supposed to do.

The slitter knife 1 is, as shown in FIG.
It is a knife having a blade on the peripheral edge of a disk and is formed in a single-edged type. The blade portion 11 is provided with a serrated tooth profile so that the line connecting the blade edges becomes a straight line without a set. Further, the anvil roll 2 has a groove 21 having an appropriate width on the peripheral surface, and the blade portion 11 of the slitter knife 1 is inserted into the groove in the installed state.

A pair of the slitter knife 1 and the anvil roll 2 corresponding to the slitter knife 1 are provided at appropriate intervals in the width direction of the slitter A. The greatest feature of the present invention is that the slitter knife 1 is That is, the back of the blade 1a is set on the rotary shaft 4 with the outside of the slitter A facing. That is, the slitter knife 1 installed on the left side when viewed from the paper feed bed side a is set on the rotary shaft 4 with the blade back 1a facing the left side and the slitter knife 1 installed on the right side with the blade back 1a facing the right side. ing.

Next, the cutting of corrugated cardboard and the like by the slitter A of the present invention having the above structure will be described. For example, the slitter knife 1 and the anvil roll 2 are rotated by a driving device such as a motor. In such a state, the object 3 to be cut is slitter A from the sheet feeding bed side a.
When it is fed to the slitter knife 1 and continuously supplied in the direction of the arrow a, the object to be cut 3 travels between the slitter knife 1 and the anvil roll 2, and the left and right ends are cut off by the slitter knife 1.

At this time, since the slitter knife 1 is set with the back edge 1a thereof facing the outside of the slitter A as described above, the back edge 1a of the slitter knife 1 faces the trim 3a side of the object to be cut 3. , With the blade table 1b facing the product side 3b,
The object to be cut 3 is cut. In the present invention,
At the time of this cutting, the back 1a of the slitter knife 1 is trimmed.
It is essential that the trim 3a side is oriented toward the 3a side, and the purpose is achieved by this, and even if the width on the trim 3a side is 30 mm or less, even if it is 5 mm or less, the cut end on the product 3b side has a crevice shape. It is possible to cut the object to be cut 3 without causing a flaw. Therefore, it is possible to apply cosmetic trimming to the object to be cut 3 with minimal bleeding and with minimal loss.

[Brief description of drawings]

FIG. 1 is a front view of a main part of a slitter showing an embodiment of the present invention, showing a state in which an object to be cut is being cut.

FIG. 2 is an enlarged view of a main part.

FIG. 3 is a perspective view showing an arrangement of a slitter knife and an anvil roll, in which an object to be cut is shown by an imaginary line.

FIG. 4 is an explanatory view of a slitter knife, (a) is a front view, (b) is a (b)-(b) cross-sectional view of (a), and a part thereof is enlarged and shown.

[Explanation of symbols]

A: Slitter 1: Slitter knife 1a: Slitter knife blade back 1b: Slitter knife blade Table 2: Anvil roll 21: Anvil roll groove 3: Object to be cut (cardboard) 3a: Bleed side (trim) 3b: Product

Claims (2)

[Claims] 1. When cutting a corrugated board or the like with a slitter, a single-edged saw blade-shaped rotary blade is used as a slitter knife, and the corrugated board or the like is cut with the back of the blade toward the cutting side of the object to be cut. Characteristic cardboard cutting method. 2. A slitter knife, and an anvil roll having a groove for receiving the cutting edge of the slitter knife,
A slitter that cuts a corrugated board or the like by passing a sheet of corrugated board or the like between them, wherein the slitter knife is a rotary blade formed in the shape of a single-edged saw blade, and the back of the blade runs through the slitter. A slitter that is installed toward the cutting side of the cut object.