JP3112742B2 - Film slitting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film slitting device for forming a large number of cuts in a raw material when producing a web-like web used for an orthogonal nonwoven fabric.

[0002]

2. Description of the Related Art In recent years, orthogonally laminated films (nonwoven fabrics) having strength in both the vertical and horizontal directions have been developed by laminating a vertically stretched reticulated web and a horizontally stretched reticulated web, and are used in various fields. It became so. As a method for producing the transversely stretched reticulated web, there is a method for producing a stretched reticulated web by forming a large number of cuts in a film in a zigzag manner and then stretching the film. For example, there are JP-B-61-11775 and JP-A-64-46193.

FIG. 5 is a view for explaining a method of making a cut in a thermoplastic film disclosed in Japanese Patent Publication No. 61-11775.
(A) is a plan view of a device for cutting a vertical length, and (b) is a cross-sectional view taken along line bb in (a). In this method, a rotating blade roll 3 having a large number of round blades 2 at a predetermined pitch on a shaft 1 and a receiving roll 4 having a surface made of soft rubber sandwich a film 5 and press lightly to heat the rotating blade roll 3. The film 5 is heated in the tank 6 and rotated while cooling the receiving roll 4 in the water tank 7 to cut the film 5 in the vertical direction.

FIG. 1C shows a case where a cut is made in the horizontal direction. The rotary blade roll 3 ′ has a number of band-shaped blades 8 parallel to the shaft 1, and is provided by a heater 9 fitted on the shaft 1. The film 5 is sandwiched between the heated roll and the receiving roll 4 cooled by water, and is rotated to make a cut in the horizontal direction. The invention of Japanese Utility Model Laid-Open Publication No. 64-46193 has almost the same configuration.

[0005]

In the above conventional method,
The surface of the receiving roll 4 is damaged and its life is short. If the surface area is increased, the service life is prolonged. However, if the diameter of the receiving roll is increased, the following problem newly occurs. If the roll diameter is increased, the size of the apparatus is increased, and replacement of the receiving roll 4 becomes inconvenient. When making a cut in the horizontal, depending on the distance between the blades,
Since a plurality of blades approach the receiving roll 4 at the same time, if the curvature of the receiving roll becomes large, if the height accuracy of the blade 8 is not further improved, as shown in FIG. And the slit is insufficient. However, it is technically difficult to improve the height accuracy of the blade.

In the case of a hot blade, as shown by a broken line in FIG. 6, the film 5 tends to adhere to the blade 8 and melt excessively, and it is necessary to separate the film from the blade 8 as early as possible. Large radii make it difficult to separate.

Further, in the conventional method, chips and the like adhere to the receiving roll 4, so that the receiving roll 4 must be cleaned, and the damaged receiving roll must be polished with high precision.
It is difficult to provide these devices in close contact with the slit device, and cleaning and polishing are usually performed after the operation is stopped, so that the operation rate cannot be reduced.

The present invention has been made in view of the above problems, and has as its object to realize a film slitting apparatus having a receiving roll capable of significantly increasing the life without increasing the curvature.

[0009]

In the film slitting apparatus of the present invention, a large number of cuts are made in the vertical or horizontal direction of the film, and the film slitting apparatus is stretched in the direction of the cut to produce a reticulated web. Equipped with a rotating blade roll having a sharp cutting edge and a circulation belt,
The film is sandwiched between the rotary blade roll and the circulation belt so that a cut can be made. In addition, the rotary blade roll is heated by a heater. With this configuration, it is possible to obtain a slit device having a receiving roll that can significantly increase the life.

[0010]

By using a circulating belt for the receiving roll, the radius of curvature of the portion in contact with the rotary blade can be reduced, and the blade need not be so precise. In addition, there is no fear of excessive melting. Further, by increasing the length of the circulation belt, the receiving area increases and the life is extended.

[0011]

FIG. 1 is a perspective view showing an embodiment of the present invention.
In the figure, 10 is a rotary blade roll, 11 is a circulation belt, 12 is a film, 13 is a turn roll, and 14 is a bath. The rotary blade roll 10 is provided with a number of band-shaped blades 16 on the outer periphery of a shaft 15 in parallel with the shaft and at a predetermined pitch. The blade 16 is provided with a number of notches 17.

The circulating belt 11 is a belt made of a soft material such as rubber and is stretched between two rolls 18 and 19. One of the rolls 18 is a small-diameter receiving roll, and the other roll 19 is immersed in water of the bath 14 to be cooled. The bath 14 is provided with a brush roll 20 for washing the surface of the circulation belt. The width of the circulating belt 11 is smaller than the width of the film 12, so that portions 21 and 21 'which are not slit are formed at both ears of the film. (Another method is to shorten the length of the blade 16 of the rotary blade roll.) In addition, although not shown, a device for polishing the surface of the circulation belt can be incorporated in this device.

In this embodiment constructed as described above, the film 12 is nipped between the rotary blade roll 10 and the circulating belt 11, and the rotary blade roll 10 and the circulating belt 11 are rotated by a driving device (not shown). For film 12,
The cuts 22 can be made in the horizontal at a predetermined pitch. The cut film 12 is a turn roll 1
After 3 is led to the horizontal stretching step.

According to the present embodiment, since the receiving surface can be enlarged by lengthening the circulation belt 11, the life can be extended. Further, since the diameter of the receiving roll 18 can be reduced, the number of blades that come into contact at the same time is small as shown in FIG. In addition, the film 12 can be quickly separated from the blade 16, and the film can be prevented from being excessively melted in the case of a hot blade described later. In addition, as shown in FIG. 2, a polishing grindstone 23 is provided at a position distant from the slit device, so that the circulating belt can be polished during operation, and the operation rate of the device can be improved.

FIG. 3 is a view showing an example in which the rotary blade roll of the first embodiment can be heated. In the figure, 1
Reference numeral 5 denotes a shaft provided with a number of band-shaped blades 16 at a predetermined pitch on the outer periphery. A hole is provided in a portion near the outer periphery of the shaft 15, and a heater 24 is embedded in the hole. By energizing 24, the temperature of blade 16 can be raised. In this embodiment, the film can be melted and cut by the heated blade 16.

FIG. 4 is a view showing a rotary blade roll when a cut is made in the vertical direction on a film. FIG.
(B) is a plan view of a disk-shaped rotary blade, and (c) is an assembled sectional view. The outer periphery of the rotary blade 25 shown in FIGS. 7A and 7B is a blade, and the blade is provided with four notches 26. The positions of the notches 26 are (a) and (b)
Are different by 45 °. Then, (a) and (b) are assembled alternately on the shaft 15 with the spacer 27 interposed therebetween as shown in FIG. The rotary blade roll 28 assembled in this way is used in place of the rotary blade roll 10 of the apparatus shown in FIG. In the case of the vertical slit, the circulation belt is easily scratched because the blades pass in the same place in a line. In order to avoid this, the slitter roll or the circulation belt can be vibrated in the width direction so that the blade does not hit the same place of the circulation belt.

[0017]

According to the present invention, even if the diameter of the receiving roll is reduced, the receiving surface can be enlarged, and the life of the circulating belt as the receiving roll can be significantly extended. In addition, since the curvature of the receiving roll can be selected to be sufficiently small, it is possible to prevent the film from adhering to the blade and being excessively melted even when the precision of the blade is poor, and even in the case of a hot blade. Further, it becomes easy to attach a device for cleaning and polishing the circulation belt during operation.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a diagram showing a part of an embodiment of the present invention.

FIG. 3 is a cross-sectional view illustrating a configuration in a case where a rotary blade roll is heated in an embodiment of the present invention.

4A and 4B are views showing a rotary blade roll for a vertical slit according to an embodiment of the present invention, wherein FIGS. 4A and 4B are plan views of the rotary blade;
(C) is an assembly sectional view.

FIG. 5 is a diagram showing an example of a conventional film slitting device, wherein (a) is a plan view of a device for cutting a vertical length,
(B) is a cross-sectional view taken along the line bb in (a), and (c) is a cross-sectional view of an apparatus for cutting a horizontal weft.

FIG. 6 is a diagram for explaining a problem to be solved by the invention.

[Explanation of symbols]

 10, 28 ... rotating blade roll 11 ... circulation belt 12 ... film 13 ... turn roll 14 ... bus 15 ... shaft 16 ... blade 17, 26 ... cutout portion 18, 19 ... roll 20 ... brush roll 21, 21 '... ear 22 ... Scissors 23 ... Whetstones 24 ... Heaters 25 ... Rotating blades 27 ... Spacers

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Yazawa 2-25-15 Higashi, Kunitachi-shi, Tokyo (72) Inventor Yuki Kuroiwa 3-6-10-403 Niiza, Niiza-shi, Saitama (72) Inventor Shuichi Murakami 4-33-5 Itabashi, Itabashi-ku, Tokyo (56) References JP-B-38-11659 (JP, B1) (58) Field surveyed (Int. Cl. ⁷ , DB name) B26F 1/20 B26D 3 / 00 B26D 3/08

Claims (2)

(57) [Claims] 1. A film slitting device for producing a web-like web by making a large number of cuts in the longitudinal or horizontal direction of a film and stretching the cut in the direction of the cut, wherein a rotating blade roll having a large number of sharp cutting edges, a circulation belt, A film slitting device comprising: a film sandwiched between the rotary blade roll and the circulating belt; 2. The film slitting device according to claim 1, wherein the rotary blade roll is heated by a heater.