JPH05329796A - Film slitting device - Google Patents

Abstract

PURPOSE:To provide a film slitting device having a support roll which provides an eminently increased life without increasing a curvature. CONSTITUTION:In a film slitting device wherein a number of perforations are formed longitudinally or laterally of a film and stretching is effected in the direction of the notch to manufacture a reticulate web, a rotary blade roll 10 having a number of sharp cutting edges and a circulating belt 11 are provided. Notches 22 are formed in a state to nip a film 12 between the rotary roll 10 and the circulating belt 11.

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 making a large number of cuts in an original fabric when producing a reticulated web used for a cross-woven nonwoven fabric.

[0002]

2. Description of the Related Art In recent years, a cross-laminated film (nonwoven fabric) having strength in both vertical and horizontal directions has been developed by laminating a vertically stretched mesh web and a horizontally stretched mesh web, and is used in various fields. It became so. As a method for producing the laterally stretched reticulated web, there is a method for producing a stretched reticulated web by making a number of zigzag cuts in the film and then stretching the film in the horizontal direction. For example, there are Japanese Patent Publication No. 61-11757 and Japanese Utility Model Publication No. 64-46193.

FIG. 5 is a diagram for explaining a method of making a cut in a thermoplastic film disclosed in Japanese Patent Publication No. 61-11757.
(A) is a top view of the apparatus which makes a score in a vertical, (b) is sectional drawing in the bb line of (a) figure. In this method, a rotary blade roll 3 having a large number of round blades 2 at a predetermined pitch on a shaft 1 and a receiving roll 4 whose surface is made of soft rubber sandwich a film 5 and lightly press it to heat the rotary blade roll 3. The film is heated in a tank 6, and the receiving roll 4 is rotated while being cooled in a water tank 7 so that a cut is made in the film 5 in the vertical direction.

Further, FIG. 1C shows a case where a cut is made in the horizontal direction, the rotary blade roll 3'has a large number of belt-shaped blades 8 parallel to the shaft 1, and the heater 9 fitted in the shaft 1 allows The film 5 is sandwiched between it and the receiving roll 4 which is heated and cooled by water, and is rotated to make a cut in the horizontal direction. The invention of Japanese Utility Model Laid-Open No. 64-46193 has a similar structure.

[0005]

SUMMARY OF THE INVENTION In the above conventional method,
The surface of the receiving roll 4 is damaged and its life is short. The larger the surface area, the longer the life. However, if the diameter of the receiving roll is increased for that reason, the following problems arise. If the roll diameter is made large, the device becomes large, and replacement of the receiving roll 4 becomes inconvenient. When making a cut in the horizontal, it depends on the blade interval,
Since a plurality of blades approach the receiving roll 4 at the same time, if the curvature of the receiving roll becomes large, the height accuracy of the blade 8 must be further improved. The slit is insufficient because it does not come into contact with. However, it is technically difficult to improve the blade height accuracy.

In the case of a hot blade, the film 5 tends to adhere to the blade 8 and melt too much as shown by the broken line in FIG. 6, and it is necessary to separate the film from the blade 8 as soon as possible, but the curvature of the receiving roll 4 A large radius makes it difficult to pull apart.

Further, according to 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 precisely ground.
There is no difficulty in providing these devices in close contact with the slit device, and since cleaning and polishing are usually performed while the operation is stopped, a decrease in operating rate cannot be avoided.

In view of the above problems, the present invention intends to realize a film slit device having a receiving roll which can remarkably extend 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 stretched in the direction of the cuts to produce a reticulated web. Equipped with a rotary blade roll having a sharp blade edge and a circulation belt,
It is characterized in that a film is sandwiched between the rotary blade roll and the circulation belt so that a cut line can be formed. In addition to that, the rotary blade roll is heated by a heater. By adopting this configuration, it is possible to obtain the slit device having the receiving roll which can remarkably extend the life.

[0010]

By using the circulating belt as the receiving roll, the radius of curvature of the portion in contact with the rotary blade can be reduced, and it is not necessary to make the height of the blade highly accurate. Also, there is no fear of over-melting. Further, by lengthening the circulation belt, the receiving area is increased and the life is extended.

[0011]

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 large number of belt-shaped blades 16 on the outer periphery of a shaft 15 in parallel with the shaft 15 at a predetermined pitch. The blade 16 is provided with a large number of notches 17.

The circulation belt 11 is a belt made of a soft material such as rubber and is stretched between the two rolls 18 and 19. The one roll 18 serves as a receiving roll having a small diameter, and the other roll 19 is immersed in the water in 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 circulation belt 11 is narrower than that of the film 12 so that unslit portions 21 and 21 'are formed in both ears of the film. (In addition, there is a method of shortening the length of the blade 16 of the rotary blade roll.) Although not shown, a device for polishing the surface of the circulation belt can be incorporated in this device.

In the present embodiment thus constructed, the film 12 is nipped between the rotary blade roll 10 and the circulation belt 11, and the rotary blade roll 10 and the circulation belt 11 are rotated by a driving device (not shown). For film 12,
It is possible to make cuts 22 on the horizontal at a predetermined pitch. The cut film 12 is the turn roll 1
It is led to a horizontal stretching process via 3.

According to this 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 are in contact with each other at the same time is small as shown in FIG. Further, the film 12 can be separated from the blade 16 quickly, and it is possible to prevent the film from being excessively melted in the case of a hot blade described later. Further, as shown in FIG. 2, a polishing grindstone 23 may be provided at a position distant from the slit device, and the circulating belt can be polished during operation, so that 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 designates a shaft having a large number of strip-shaped blades 16 provided on the outer periphery at a predetermined pitch. 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 the blade 16 can be raised. In this embodiment, the film can be melted by the heated blade 16 to make a cut.

FIG. 4 is a view showing a rotary blade roll for making a cut in the film in the vertical direction. The same figure (a),
(B) is a top view of a disk-shaped rotary blade, (c) is an assembly sectional view. The rotary blade 25 shown in FIGS. 3A and 3B has a blade on the outer circumference, and four notches 26 are provided in the blade. The positions of the notches 26 are (a) and (b).
And are different by 45 °. Then, (a) and (b) are alternately overlapped with each other with the spacer 27 sandwiched therebetween, as shown in FIG. The rotary blade roll 28 thus assembled is used by replacing the rotary blade roll 10 of the apparatus shown in FIG. 1 so that the film 12 can be formed with staggered cuts in the vertical direction. In the case of the vertical slit, the blades pass through the same place in a row, so the circulation belt is easily scratched. 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 position on the circulation belt.

[0017]

According to the present invention, even if the diameter of the receiving roll is made small, the receiving surface can be made large, and the life of the circulation belt as the receiving roll can be remarkably extended. Further, 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 melting too much even when the precision of the blade is poor and even when the blade is a hot blade. Further, it becomes easy to install a device for cleaning and polishing the circulation belt during operation.

[Brief description of 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 showing a configuration for heating a rotary blade roll in an example of the present invention.

FIG. 4 is a view showing a rotary blade roll for a vertical slit of an embodiment of the present invention, (a) and (b) 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, in which (a) is a plan view of a device for making a score in a vertical direction,
(B) is sectional drawing in the bb line | wire of (a) figure, (c) is sectional drawing of the apparatus which makes a notch in a side.

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 ... Blades 17, 26 ... Notch portion 18, 19 ... Roll 20 ... Brush roll 21, 21 '... Ear 22 … Cutting 23… Whetstone 24… Heater 25… Rotating blade 27… Spacer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Yazawa 2-25-15 Higashi 2-chome, Kunitachi, Tokyo (72) Inventor Yuki Kuroiwa 3-6-10-403 Niiza, Niiza-shi, Saitama (72) Inventor Shuichi Murakami 4-33-3 Itabashi, Itabashi-ku, Tokyo

Claims (2)

[Claims] 1. A film slitting device for producing a reticulated web by making a number of cuts in the lengthwise or widthwise direction of a film and stretching in the direction of the cuts, and a rotary blade roll having a large number of sharp blade edges and a circulation belt. A film slitting device comprising: a rotary blade roll and a circulating belt so that a film can be sandwiched between the rotary blade roll and the circulating belt to form a cut line. 2. The film slitting device according to claim 1, wherein the rotary blade roll is heated by a heater.