JP2007075960A - Shear cutting device and slitting method of belt-like sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a slitting method which cuts a thick belt-like sheet without scratching or adhering dust, and so as to prevent poor cutting causing raised edges (edge height, high edge) of a take-up roll, in a sheet dividing and winding device by shear cutting with an upper blade installed opposing to a plurality of cylindrical blade (lower blade). <P>SOLUTION: The blade edge of disc shape blade 6 is machined to the shape suppressing the raised edges of the belt-like sheet in cutting. The belt-like sheet is pressed and cut with a uniform force while holding it in the vicinity of the cross section, and a uniform pressure part 16 for not leaving a permanent deformation is provided in the vicinity of cutting part, and the slitting which suppresses the sharp cross section and raised edge is performed by providing a relaxing part 17 relieving the force for pressing and cutting from the uniform part 16 toward the backside of the disc shape blade 6. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  Cylindrical blades are attached to a rotary drive shaft arranged in parallel with the sheet conveying roll, and a plurality of cylindrical blades are arranged in parallel, and disk-shaped blades are installed diagonally through the sheet. The present invention relates to a shear cutting device that continuously cuts a sheet that is slidably contacted and travels between a cylindrical blade and a cylindrical blade.

As the stripper for dividing the belt-like sheet, slitters by various cutting methods such as a leather cut method, a block cut method, and a shear cut method are used. (Patent Document 1)
The leather-cut method generally has a grooved roller in which a number of circumferential grooves are formed at a predetermined pitch over the entire width of the outer peripheral surface, a support beam provided parallel to the grooved roller, and moved along the support beam to a predetermined position. And a tool post for supporting a leather blade that can be attached to the belt, and slitting the belt-like sheet by inserting the blade edge of the leather blade into the groove of the grooved roller. Leather cuts are often used for slits in thin plastic films, but there are problems with band-like sheets exceeding 50 μm, such as burrs on the cut surface and noticeable ears. (Patent Document 2, Patent Document 3)
On the other hand, shear cutting methods include block cutting using two opposing cylindrical blades and shear cutting in which a cylindrical blade and a disk-shaped blade are opposed to each other. The upper blade edge is meshed with the lower blade edge and the belt-like sheet is sheared between them, so that the thick belt-like sheet can be accurately slit. (Patent Document 4)
Block cut is a method of cutting a belt-like sheet running between cylindrical blades by cylindrical blades whose side surfaces are in sliding contact with each other. In practice, this adjustment is difficult because the side surfaces of the blades need to be in close contact with each other, and burrs are likely to occur on the cut surface due to poor contact, and the accuracy of the cylindrical blades is diversified for diversified products. A high set is required, which is a loss of time.

A shear cut usually consists of a rotating disk-shaped blade and a cylindrical blade, and the disk-shaped blade always cuts with zero clearance while being in contact with the cylindrical blade by a spring or its own elasticity, so the cutting surface is sharpened There are advantages such as. However, in this cutting method, the disc-shaped blade side pushes and cuts the belt-like sheet, and thus the ears are generated on the disc-shaped blade side of the cut surface.
Japanese Patent Laid-Open No. 2002-103278 Japanese Patent Publication No.59-13414 Japanese Patent Publication No.62-19998 Japanese Patent Application Laid-Open No. 11-111488

  Therefore, in view of the above circumstances, the present invention has an object to provide a slit method capable of suppressing the occurrence of burrs and ears on a cut surface while maintaining an easy adjustment structure of a cylindrical blade and a disc-shaped blade in shear cutting. It is what.

The present invention employs the following means in order to solve such problems. That is, the shear cut device of the present invention is
Cylindrical blades are attached to a rotational drive shaft arranged in parallel with the belt-shaped sheet conveyance roll, and a plurality of cylindrical blades are arranged in parallel, and disk-shaped blades are installed diagonally through the belt-like sheet, A shear-cutting device that continuously cuts a belt-like sheet that runs between the cylindrical blade and the cylindrical blade by bringing them into sliding contact with each other, and the width of the flat portion and the edge angle are the belt-like sheet as the tip shape of the disk-like blade. A shear-cut device that satisfies the following formulas (a) and (b) between thicknesses.
(A) 8.6 × 10 ⁻² Ln (X) +0.4 <equal pressure section (mm) <8.6 × 10 ⁻² Ln (X) +0.6
(However, X: strip sheet thickness (mm))
(B) 65 × X ^0.04 −2 <relaxation part (°) <65 × X ^0.04 +2
It is.

  According to the shear-cut device of the present invention, since the force applied to the belt-like sheet in the vicinity of the cut surface can be relaxed, the permanent deformation of the sheet at the time of cutting can be suppressed and the ear standing can be prevented. Moreover, by using a shear cut with a disk-shaped blade, a sharp cut surface that is difficult to achieve with a block cut can be easily adjusted.

  Next, an embodiment of the present invention will be described based on FIG. 1, FIG. 2, FIG. 3, and FIG. A drive shaft 1 rotated by a motor (not shown), a drive roll 1 connected to the drive shaft 1 by a gear belt (not shown), and the like and rotated in the same direction by the rotation of the drive shaft 1 are arranged in parallel. Travel in the direction of rotation of the transport roll 2.

  The cylindrical blade 4 that is attached to the outer periphery of the drive shaft 1 is disposed so as to contact the belt-like sheet, and a disk-like blade 6 that is supported by the tool post 5 is installed on the opposite side through the belt-like sheet.

  The cylindrical blade 4 has a cutting edge 7 provided at the intersection of the cylindrical outer peripheral surface 8 and the circular side surface 9, and the cylindrical blade 4 is fixed and attached so as to rotate with the rotation of the drive shaft. In addition, it can be fixed at an arbitrary position in the axial direction using a set bolt or the like.

  The disk blade 6 has a cutting edge 10 provided at the intersection of the disk outer peripheral surface 11 and the circular side surface 12, and can be fixed at an arbitrary position in the axial direction by a tool post 5 that supports the disk-shaped blade 6. It is like that. After the cylindrical blade 4 is installed in the slit width 13 of the belt-shaped sheet, the clearance is set to zero while applying the preload 14 of 50 to 200 g, preferably 100 to 150 g, utilizing the elasticity of the disk-shaped blade 6. A lapping portion 15 is provided on the cutting edge 7 of the cylindrical blade 4 and the cutting edge 10 of the disk-shaped blade 6, and the lapping amount is 0.1 to 2.0 mm, preferably 0.2 to 0.7 mm.

The cutting edge 10 of the disk-shaped blade 6 is processed into a shape that can suppress the standing of the band-shaped sheet during cutting. In other words, the vicinity of the cut surface is pushed with a uniform force while gripping the belt-like sheet, and 0.1 to 0.5 mm is processed flat as the pressure equalizing portion 16 for preventing the occurrence of the earing Th due to permanent deformation near the cut portion, 55-65 ° machining is performed as a relaxation portion 17 that softens the pushing force from the pressure equalizing portion 16 toward the disc outer peripheral surface 11 of the disc-like blade 6. The dimensions and angles of the pressure equalizing section 16 and the relaxing section 17 need to be changed depending on the thickness of the belt-like sheet, and the relationship with the thickness of the belt-like sheet is as shown in the following expressions (a) and (b).
(A) 8.6 × 10 ⁻² Ln (X) +0.4 <equal pressure section (mm) <8.6 × 10 ⁻² Ln (X) +0.6
(However, X: strip sheet thickness (mm))
(B) 65 × X ^0.04 −2 <relaxation part (°) <65 × X ^0.04 +2.

  When the pressure equalizing portion 16 deviates from the above formula, the amount of permanent deformation applied to the belt-like sheet increases, and the ears stand up. When the pressure equalizing portion 16 deviates greatly, the cutting edge is widened and the sharpness of the cut surface is lost.

Similarly, the mitigation part 17 has a strong tendency to stand up when the above equation is deviated small, and the sharpness of the cut surface is lost when it greatly deviates.
The pressure equalizing part 16 and the relaxation part 17 are preferably polished to a surface roughness of 0.2 to 0.6 s after coating with 50 to 100 μm plating, etc. 0.2-0.8R is more preferable than 55-60 degree inclination processing.

  Hereinafter, although the example which implemented the slit of the strip | belt-shaped sheet | seat which suppressed the ear standing using the slit method of this invention is demonstrated based on FIG.1,2,3, the content of this invention is not limited to these. .

  FIG. 1 is a schematic configuration diagram of a test slitter, in which a drive shaft 1 rotated by a motor (not shown) is connected to the drive shaft 1 by a gear belt (not shown), and is conveyed in the same direction by the rotation of the drive shaft 1. The roll 2 is disposed, and the belt-like sheet 3 travels in the rotation direction of the transport roll 2. A cylindrical blade 4 is attached to the outer periphery of the drive shaft 1 and is in contact with the belt-like sheet, but rotates at the same speed as the traveling speed of the belt-like sheet 3 and the outer periphery of the cylindrical blade 4. The disk-shaped blade 6 is supported on the opposite side by a tool rest 5 via a belt-like sheet, and the circular side surface 9 of the cylindrical blade 4 and the circular side surface 12 of the disk-shaped blade 6 are installed with zero clearance. In order to maintain this clearance zero, it is necessary to apply the preload 14 to the cylindrical blade 4 in the axial direction with respect to the cylindrical blade 4, and it may be pressed using the rigidity of the disk-shaped blade 6. A leaf spring or the like may be installed on the tool post 5.

  Due to the resistance at the time of cutting the belt-like sheet, a force to be spread is applied to the cutting edge 7 of the cylindrical blade 4 and the cutting edge 10 of the disk-shaped blade 6, so as to prevent miscutting, the cutting edge 7 of the cylindrical blade 4 and the disk-shaped The blade edge 10 of the blade 6 was wrapped 0.2 mm.

By taking a large amount of wrapping, miscuts can be reliably prevented. However, since it causes ears standing, it is better to set the amount of wrapping according to the following equation depending on the thickness of the belt-like sheet.
・ 0.3Ln (X) +0.90 <lap amount (mm) <0.3Ln (X) +0.95
(However, X: sheet thickness (mm))
For example, if the thickness of the belt-like sheet is 100 μm, the appropriate wrap amount is: 0.3 Ln (0.1) +0.90 <wrap amount (mm) <0.3 Ln (0.1) +0.95
・ 0.2 <wrap amount (mm) <0.25
And

<Example 1>
A polyethylene terephthalate sheet having a thickness of 50 μm was slit for 2000 m using a disk-shaped blade having a pressure equalizing portion of 0.2 mm and a relaxing portion of 58 ° at a speed of 200 m / min in a state where the winding tension was 15 N.

<Example 2>
A polyethylene terephthalate sheet having a thickness of 200 μm was slit by 1000 m using a disk-shaped blade having a pressure equalizing part of 0.4 mm and a relaxing part of 65 ° at a speed of 100 m / min in a state of a winding tension of 15 N.

<Example 3>
A polyethylene terephthalate sheet having a thickness of 500 μm was slit for 1000 m using a disk-shaped blade having a pressure equalizing part of 0.5 mm and a relaxation part of 67 ° at a speed of 100 m / min in a state where the winding tension was 15 N.

<Comparative Example 1>
A polyethylene terephthalate sheet having a thickness of 200 μm was slit by 1000 m using a disk-shaped blade having a pressure equalizing part of 0.2 mm and a relaxing part of 58 ° at a speed of 100 m / min in a state of a winding tension of 15 N.

<Comparative example 2>
A polyethylene terephthalate sheet having a thickness of 50 μm was slit for 2000 m using a disk-shaped blade having a pressure equalization part of 0.4 mm and a relaxation part of 65 ° at a speed of 200 m / min in a state of a winding tension of 15 N.

<Comparative Example 3>
A polyethylene terephthalate sheet having a thickness of 500 μm was slit for 1000 m using a disk-shaped blade having a pressure equalizing part of 0.5 mm and a relaxation part of 67 ° at a speed of 100 m / min in a state where the winding tension was 15 N.

<Comparative example 4>
A polyethylene terephthalate sheet having a thickness of 30 μm was slit for 2000 m using a disk-shaped blade having a pressure equalizing portion of 0.2 mm and a relaxing portion of 58 ° at a speed of 200 m / min in a state where the winding tension was 15 N.

<Evaluation of ear standing and cut surface>
Regarding the slit rolls of the polyethylene terephthalate films obtained in Examples 1 to 3 and Comparative Examples 1 to 4, the amount of ears was measured with a dial gauge (2119F) manufactured by Mitutoyo Corporation, and a microscope (DG-2A) manufactured by SCALAR Corporation. The cut surface was visually inspected. The results are shown in Table 1.
Evaluation criteria:
◎: Ear standing is less than 0.02%, no flaking on cut surface ○: Ear standing is less than 0.02%, flickering on cutting surface Δ: Ear standing is 0.02% or more, no flaking on cutting surface ×: Ear standing is 0.02% or more, and there is a fluff on the cut surface

  As can be seen from Table 1, the belt-like sheets slit in Examples 1, 2, and 3 were able to suppress ear standing. On the other hand, the slit-like sheet of Comparative Examples 1 to 3 not only became prominent as the thickness increased, but also had a problem that the cut surface was fluffed and could not become a product. Many. In Comparative Example 4, although the effect of suppressing the ear standing according to the present invention can be obtained in the thin belt-like sheet, flaking is generated on the cut surface, and a great result is not obtained as compared with the slitting method using a known leather blade. It was.

It is explanatory drawing which shows one Example about the positional relationship of the strip | belt-shaped sheet | seat in the cutter apparatus which concerns on this invention, a running direction, and a cutter apparatus. It is explanatory drawing which shows the principal part of one Embodiment. FIG. 3 is a supplementary explanatory diagram of FIG. 2. It is explanatory drawing which shows the principal part of one Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Drive shaft 2 ... Conveyance roll sheet | seat conveyance roll 3 ... Strip | belt-shaped sheet | seat 4 ... Cylindrical blade 5 ... Turret 6 ... Disc-shaped blade 7 ... Cutting edge 8 ... Cylindrical outer peripheral surface 9 ... circular side surface 10 ... blade edge 11 ... disc outer peripheral surface 12 ... circular side surface 13 ... slit width 14 ... preload 15 ... lap portion 16 ... equal pressure Part 17 ... Relaxation part

Claims (4)

Cylindrical blades are attached to a rotational drive shaft arranged in parallel with the belt-shaped sheet conveyance roll, and a plurality of cylindrical blades are arranged in parallel, and disk-shaped blades are installed diagonally through the belt-like sheet, A shear-cutting device that continuously cuts a belt-like sheet that runs between the cylindrical blade and the cylindrical blade by bringing them into sliding contact with each other, and the width of the flat portion and the edge angle are the belt-like sheet as the tip shape of the disk-like blade. A shear-cut device that satisfies the following formulas (a) and (b) between thicknesses.
(A) 8.6 × 10 ⁻² Ln (X) +0.4 <equal pressure section (mm) <8.6 × 10 ⁻² Ln (X) +0.6
(However, X: strip sheet thickness (mm))
(B) 65 × X ^0.04 −2 <relaxation part (°) <65 × X ^0.04 +2   A method for slitting a belt-like sheet using the shear-cut device according to claim 1.   The method for slitting a belt-like sheet according to claim 2, wherein the belt-like sheet is a biaxially stretched polyester having a thickness of 0.05 to 0.5 mm.   A rolled layer of a biaxially stretched polyester film wound after being slit by the slitting method for a belt-like sheet according to claim 3.

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