JPH05212695A - Two-piece slitter knife with guider - Google Patents

Abstract

(57) [Summary] [Purpose] In a two-piece slitter with a rotating guider that cuts only the resin of a running resin-coated paper that is coated with a resin wider than the width of the paper substrate, a stable cutting edge with a clean cut surface is provided. It is an object of the present invention to complete a two-piece slitter knife with a guider that can be cut, the life of the blade can be maintained for a long time, and the lower blade can be polished conveniently. A rotary two-piece slitter knife having an upper blade and a lower blade that slits only resin ears protruding from both ends of a paper base into a constant width, wherein the lower blade and the lower blade have a cylindrical surface that contacts the resin-coated paper. A disk-shaped upper blade that comes into contact with and cuts the resin ear, and a cylindrical surface that is provided coaxially with the lower blade at a distance from the contact portion of the upper blade and the lower blade and that contacts the resin ear, and , A two-piece slitter knife with a guider that consists of a guider that can change the position that contacts the resin ear and guides the resin ear along the axis. Further, the blade angle of the lower blade is acute, and the guider can be removed when polishing the lower blade.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-piece slitter knife with a guider capable of stably running a resin portion to be slit and forming a good cut surface.

[0002]

2. Description of the Related Art Conventionally, in general resin-coated paper, resin is melted and extruded on both sides of a paper substrate, and then the paper substrate is slit at the resin-coated portion as shown in FIG.
A method of finishing a roll with a constant width is used.

According to this method, the paper base portion covered with the resin is also manufactured by slitting, so that a paper base having a width of the slit must be prepared in advance. Also,
When paper dust generated during slitting adheres to the surface of resin-coated paper and the resin-coated paper is used as a photographic support,
In the step of coating the emulsion on the photographic support after slitting, there is a drawback that the paper powder adhering to the surface of the photographic support or the paper roll causes emulsion coating failure. As a countermeasure against this, Japanese Patent Application Laid-Open No. 3-144439 discloses a conventional manufacturing method in which a paper base is completely covered with resin. In the publication, as shown in FIG. 4, a shear cutter having a guider at the lower blade portion is disclosed. Although a schematic view of slitting the resin portion from both ends of the paper base according to the method is described, there is no appropriate description about the structure of the two-piece slitter knife with a guider.

Regarding the method of slitting only the resin ears of resin-coated paper coated with a resin wider than the width of the paper base, the conventional shear-cut method consisting of the upper and lower blades has good cutting performance, but the slit resin ears are Since there is nothing to guide and support, it is not preferable to slit the thin resin with wrinkles in the resin in the slit portion. Further, in the score cut method, the resin ears have a guiding property, but the cut ends are beard-shaped and the cutting performance is not so good. Since the life of the upper blade is short, the number of times of exchanging the upper blade increases and it is not efficient.

Further, in the case of a shear cutter integrated with a guider, when resin is coated with a tandem type laminator, the flow of the resin ear portion changes due to the change of the width of the molten resin applied wider than the width of the paper substrate, so that slitting should be performed. There is a drawback that the width of the resin ears becomes unstable and the accident that the resin ears slit in the lower blade wraps around. Also, if the resin is thin, the ears will bend and enter the groove formed by the guider and the lower blade.In such a case, replace it with another shear guide cutter with a narrow groove and integrated guider. Had to stop the line and replace it. Further, the lower blade composed of the conventional cylindrical surface and the lower surface has a blade edge angle of a right angle in a column shape, and the contact with the upper blade makes a surface contact and becomes a friction surface, which causes abrasion of the upper blade and the lower blade. It was early. When the lower blade was polished, the guider was fixed together with the lower blade, so that the polishing was difficult.

As described above, the solution of the problems of the conventional slitter has become an important issue as high-speed and precision machining is required.

[0007]

DISCLOSURE OF THE INVENTION The present invention has the above-mentioned problems, namely, the resin ears can be stably cut with a clean cut surface, the position of the guider can be finely adjusted, and the life of the blade is long. It is an object of the present invention to complete a two-piece slitter knife with a guider that can be maintained and easily polish the lower blade.

[0008]

DISCLOSURE OF THE INVENTION The present invention discusses a slitter capable of stably cutting a resin ear with a clean cut surface, finely adjusting the blade, maintaining a long blade life, and easily replacing a lower blade. However, I found out that the following measures would solve the problem. That is, (1) a resin-coated paper whose both sides are coated with a resin, in a rotary two-piece slitter knife having an upper blade and a lower blade that slits only resin ears protruding from both ends of the paper substrate into a constant width. A lower blade having a cylindrical surface that abuts the paper,
It has a disk-shaped upper blade that contacts the lower blade and cuts the resin ear, and a cylindrical surface that comes into contact with the resin ear and is provided coaxially with the lower blade at a distance from the contact portion between the upper blade and the lower blade. In addition, a two-piece slitter knife with a guider that consists of a guider that can change the position of contacting and guiding the resin ears along the axis. 2. The two-piece slitter knife with a guider according to claim 1, wherein the blade angle of the lower blade is an acute angle. 3. The spacing between the lower blade and the guider is used within a range of 1 to 20 mm, and the guider is removed when polishing the lower blade. It is a two-piece slitter knife with a guider that can be used.
Hereinafter, the present invention will be described with reference to FIGS. 1 and 2 showing one embodiment of the present invention.

The two-piece slitter knife with a guider of the present invention is spaced from the upper blade (3) and the lower blade (1), which are in contact with each other and slit, and the contact portion between the upper blade (3) and the lower blade (1). Further, coaxially with the lower blade, the cylindrical portion abuts against the resin ear to support the resin ear, and a guider (2) that can change the position for guiding the resin ear along the axis. Fine adjustment of the gap between the grooves formed by the lower blade (1) and the guider (2) provided coaxially can be performed, for example, on the inner cylindrical surface where the shaft portion of the lower blade (1) and the guider (2) are in contact. If the lower blade (1) is moved by cutting the screw (8) and rotating the guider (2), or by simply loosening the fixing fixed with a screw or key groove and sliding the guider (2). By changing the distance of the groove between the guiders (2), the resin ears are guided according to the width and the thickness of the resin ears to be slit. The upper blade is located on the resin ear side and the lower blade is located on the resin coated paper side.
The lower blade (1) is positioned at a right angle to the resin-coated paper to be slit and preferably has a diameter of about 200 mm. The material is SKD
Alternatively, SKH is used and the hardness is preferably Hs 80 to 90 °. The blade angle of the lower blade of the present invention is preferably an acute angle. Particularly, 75 to 85 ° is suitable. That is, since the cutting edge of the conventional lower blade integrated with the guider is at a right angle and the contact with the upper blade is a surface contact, the surface becomes a friction surface, and the upper and lower blades are heavily worn. However, if the lower blade has an acute angle, the contact with the upper blade only makes contact with the blade tip on the outer periphery of the lower blade, and thus the surface does not become a friction surface and is less likely to wear. Also, the cuttability is good. The guider (2) is intended to guide the resin ear, and the material and hardness are not specified in particular, but in order to keep the gap with the lower blade (1) constant, when using the key groove, it is on the circumference. It is advisable to support them at three points and fix them with set bolts (7). The upper blade (3) is the same as the lower blade (1), is positioned at right angles to the resin-coated paper, and preferably has a diameter of 120 to 150 mm. Also, the material is the same as that of the lower blade (1), and the hardness is preferably Hs 75 to 90 °. Further, the upper blade may be slightly harder than the lower blade. The blade edge angle may be a single edge of 15 to 60 °, but 35 to 45 ° is suitable in consideration of the cutting edge of the resin ear, the life of the blade, and the like. The relationship between the upper blade and the lower blade is preferably 1 to 3 mm.

Regarding the relationship between the guider and the lower blade in the present invention, the adjustment distance of the groove between the lower blade (1) and the guider (2) can be appropriately adjusted depending on the use conditions. It is adjusted in the range of 1 to 20 mm in order to slit only the protruding resin ear. Especially preferably 2-5
mm. If the range is narrower than 1 mm, the upper blade may hit the lower blade (1) or the guider (2) when setting the upper blade, and the blade may be spilled, making the blade difficult to handle. If it is wider than 20 mm, the resin ear portion may enter the groove between the lower blade (1) and the guider (2) and wind around the guider or the lower blade, resulting in poor operation stability. To polish the lower blade, loosen the set bolt and remove the key, or if the guider and the lower blade have a screw relationship, rotate the guider and remove the guider. In the conventional lower blade with integrated guider, the guider interferes and the polishing cannot be performed precisely and efficiently. Moreover, the desired sharp angle could not be obtained.

[0011]

With the above construction, in the two-piece slitter with a guider of the present invention, the position of the guider can be finely adjusted in the direction coaxial with the lower blade, so that the resin ear can be stably cut with a clean cutting surface, and the blade can be cut. Longevity is maintained,
The lower blade can be easily polished and a precise sharp angle can be realized.

[Brief description of drawings]

FIG. 1 is a central sectional view of a resin-coated paper of a two-piece slitter with a guider showing an embodiment of the present invention viewed from the running direction.

FIG. 2 is a central cross-sectional view showing the relationship between the lower blade and the guider in the present invention as seen from the running direction of the resin-coated paper.

FIG. 3 is a central sectional view of a slitter of a comparative example.

FIG. 4 is a schematic view of a central cross section of a resin-coated paper of a fixed type two-piece slitter with a guider in which a guider and a lower blade are integrated, as seen from a running direction.

[Explanation of symbols]

1 Lower blade 2 Guider 3 Upper blade 4 Paper base 5, 6 Coating resin 7 Set bolt 8 Screw part

Claims (3)

[Claims] 1. A rotary type two-piece slitter knife having an upper blade and a lower blade for slitting resin ears protruding from both ends of a paper base into a constant width of a resin-coated paper having both sides covered with a resin. Lower blade having a cylindrical surface that contacts the resin-coated paper, disk-shaped upper blade that cuts the resin ear by contacting the lower blade, and coaxial with the lower blade with a distance from the contact portion between the upper blade and the lower blade. A two-piece slitter knife with a guider that is provided with a guider that has a cylindrical surface that comes into contact with the resin ear and that can change the position of contacting the resin ear and guiding the resin ear along the axis. 2. The two-piece slitter knife with a guider according to claim 1, wherein the blade angle of the lower blade is an acute angle. 3. The two-piece slitter knife with a guider according to claim 1, wherein the lower blade and the guider are used in a range of 1 to 20 mm, and the guider can be removed when polishing the lower blade.