JPH08141983A - Hard cutting device for continuous thin-film-like web - Google Patents

Abstract

PURPOSE: To provide a hard cutting device for a continuous thin film-like web, wherein a web can be press-cut into a clean cut end, the sharpness of a cutter blade is held well for a long period by elastically receiving the cutter blade by a part for receiving the cutter blade, and the exchanging time of a cutter roll and the member for receiving the cutter blade can be decreased. CONSTITUTION: A steel-made belt 8 is wound around winding rolls 7a, 7b, and a die cutter roll 9 provided with a cutter blade 9b and pad parts 9c, 9c is provided. The stretching part of a winding part 8a of the steel-made belt 8 is outside from a tangent P of a pair of winding rolls by belt receiving rolls 10a, 10b, and the steel-made belt 8 is brought in contact with a cutter blade 9b and the pad parts 9c, 9c. The length of the steel-made belt 8 is so set as not to be a multiple of the peripheral length on the pad parts 9c, and the tangential velocity of the cutter blade 9b and the pad parts 9c and the traveling speed of the steel-made belt 8 are made to be matched to each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hard-cutting device capable of clean-cutting a continuous thin film web such as a toilet sheet, a plastic film or a nonwoven fabric into an elliptic curve.

[0002]

2. Description of the Related Art Toilet seats, plastic films,
As a cutting method for cutting a continuous thin film web such as a nonwoven fabric into, for example, an elliptic curved shape, there are a hard cutting method and a soft cutting method.

In the hard-cut method, as shown in FIG. 2 (a), a cutter blade 1b whose blade tip is not jagged like a saw tooth and has a constant flat surface development shape is a base circular circumference surface 1a. And a die cutter roll 1 having a pair of pillow portions 1c, 1c having a height of about 0.1 mm lower than the blade length of the cutter blade 1b on both sides sandwiching the cutter blade 1b on the circumferential surface of the base circle, The pair of pillow portions 1c, 1c of the die cutter roll 1 and the cutter blade 1b are applied to the receiving roll 2 to bring them into rolling contact, and a thin film web W passed between the rolls.
Or cut it into a clean cut with the cutter blade 1b, or, as shown in FIG. 2 (b), the cutter blade 1b
And a pair of die cutter rolls 1A and 1B having a pair of pillow portions 1c and 1c, and a cutter blade 1b of one die cutter roll 1A and a cutter blade 1b of the other die cutter roll 1B are formed symmetrically. However, the cutter blades 1b, 1b press the thin film web W, which is passed between the rolls, to a clean cut edge for cutting.

As shown in FIG. 3 (a), the soft-cut method uses a cutter roll 3 having a cutter blade 3a having a blade edge which is not uniform and is serrated like a saw tooth and which has a required curved surface when developed in a plane. It is equipped with the cutter blade 3a to pierce the receiving roll 4 made of rubber or paper,
The thin film web W passed between the rolls is pierced and cut by the cutter blade 3a, or as shown in FIG.
The cutter blade 5 is provided with a cutter roll 5 having a uniform cutter blade 5a whose edge is not jagged like a saw tooth, and a receiving roll 6 having a groove 6a symmetrical to the cutter blade 5a. Both rolls are rolled and rotated so as to enter the groove 6a, and the thin film web W passed between the rolls is pushed and cut by the cutter blade 5a.

[0005]

According to the hard-cut method shown in FIGS. 2 (a) and 2 (b), the cutter blade wears and the portion of the receiving roll against which the cutter blade abuts is dented.
Since the sharpness deteriorates early, the blade of the cutter roll must be re-sharpened, the diameter of the pair of pillows must be reduced as the blade length is shortened as the blade is re-sharpened, and the part of the receiving roll that the cutter blade touches is cut. It is necessary to reduce the diameter to remove the dents and adjust the roll axis, and if you do it three or four times, the diameter will be too small and the cutting pitch of the thin film web will shift. And the receiving roll has to be replaced, and the operation is forced to be suspended during the replacement. Especially when replacing the die cutter roll,
With ultra-thin paper, where the difference between the thickness of the paper and the thickness of the pulp fiber is small, the strength of the fiber alone has a large effect on the strength of the entire paper, so the sharpness of the die cutter roll has a subtle effect.
If there is a slight scratch or wear on the blade, the fibers at the part that hits it will remain uncut, and if you try to tear off the remaining part,
There is a problem that the fiber pulls the other part and tears it. In particular, disposable masks made using thin film webs such as non-woven fabric, which is an aggregate of synthetic fibers and chemical fibers that are ultra-fine fibers and have high tensile strength, can be processed continuously even if a few ultra-fine fibers remain. It cannot be used as a product. In order to eliminate this problem, the sharpness of the die cutter roll must be constantly monitored and the die cutter roll must be replaced in a short period of time. For this reason, the cost of re-sharpening the cutter blade and the purchase cost of a new die cutter roll have reached a high level, and the running cost is high, and eventually the product cost of toilet sheets etc. made by processing continuous thin film webs. Is a cause of high cost. In the case of a thin film web having hard fibrous material, if the cutting edge of the cutter blade becomes poor, the cutting line of the product will not be cut and the product will be connected by fibrous material.

According to the soft cutting method shown in FIGS. 3 (a) and 3 (b), problems such as wear of the cutter blade, re-sharpening of the cutter blade and reduction in diameter of the pillow portion are not caused.
It becomes a tearing score line and it can not be cut cleanly, which leads to deterioration of product quality. According to the soft-cut method, since it is cut into pieces, it is not suitable for a thin film web having fibrous material.

The present invention has been devised in view of the above-mentioned points, and it is possible to push and cut into a clean cut edge, and even if the cutter blade is slightly worn, the portion that receives the cutter blade elastically acts on the cutter blade. It is an object of the present invention to provide a continuous hard-cutting device for thin film webs that can be properly received and the cutting blade can be kept sharp for a long period of time, and the number of times of exchanging the cutter roll and the member that receives the cutter blade can be reduced.

[0008]

According to the present invention, as a means for solving the above problems, a pair of wrapping rolls 7 are provided.
An endless steel belt 8 is wound around a and 7b so that the tension can be adjusted, and at a position corresponding to approximately the center between the winding rolls 7a and 7b, a base circle is formed outside the winding of the steel belt 8. A cutter blade 9b having a constant blade length and a flat development shape having a required curved shape is provided at a required position on the base circular diameter circumferential surface 9a so that the radial circumferential surface 9a is slightly separated by a required small dimension. Also, a die cutter roll 9 having a pair of pillow portions 9c, 9c whose height is required to be small by a small dimension at both sides of the cutter blade 9b of the circumferential surface 9a of the base circle is provided, and inside the winding of the steel belt 8 is provided. By the belt receiving rolls 10a and 10b provided so as to be positioned,
The tension of the wrapping portion 8a of the steel belt 8 on the cutter roll side comes outside the tangent line P of the pair of wrapping rolls, and the steel belt 8 is the cutter blade 9 of the die cutter roll 9.
b and the pillow portions 9c, 9c are pressure-contacted with each other, and further, the length of the steel belt 8 is configured not to be a multiple of the circumferential length of the pillow portion 9c of the die cutter roll 9, and is continuous. A hard cut device for a thin film web is provided.

[0009]

Since the height of the pillow portions 9c, 9c is smaller than the blade length of the cutter blade 9a by a required minute dimension, the pillow portions 9c, 9c roll and rotate with respect to the steel belt 8 and the cutter blade 9b moves. Pillows 9c, 9c are used to cut the required cutting force into a thin cut web thin film web W which rolls and tunes in speed by appropriately suppressing the push-cutting force pressed against the steel belt 8. The wrapping portion 8a of the steel belt 8 on the cutter roll side is stretched outside the tangent line P of the pair of wrapping rolls to elastically press the steel belt 8 against the cutter blade 9b and the pillow portions 9c, 9c. The portions of the steel belt 8 that receive the cutter blade 9b do not become the same location and shift by the required size, and the dents that are the traces of the cutter blade 9b on the steel belt 8 do not form significantly over a long period of time. Even if the blade 9b is slightly worn, the uniformity of contact between the steel belt 8 and the cutter blade 9b can be maintained for a long period of time, so that the sharpness of the cutter blade 9b can be prolonged.

[0010]

FIG. 1 shows an example in which the continuous thin film web hard-cutting apparatus of the present invention is applied to a toilet seat manufacturing apparatus. The toilet seat manufacturing apparatus of this embodiment includes a frame 11 having a pair of upper and lower pinch rolls 12.
a and 12b are on the upstream side, and a pair of upper and lower pinch rolls 1
3a and 13b are provided on the downstream side, the winding roll 7a is provided on the downstream side adjacent to the pinch roll 12b, and the winding roll 7b is provided on the upstream side adjacent to the pinch roll 13b. A die cutter roll 9 having a cutter blade 9b and pillow portions 9c, 9c is provided at a required upper position corresponding to approximately the center between 7a and 7b. The endless steel belt 8 wound around the winding rolls 7a and 7b is the belt receiving rolls 10a and 1b.
0b, the upper winding portion 8a of the steel belt 8 is pulled upward by about 10 mm from the tangent line P1 of the pair of winding rolls and the cutter blade 9b of the die cutter roll 9 is attached.
And the pillow portions 9c, 9c are adjustably pressure-welded, and the tension roll 14 projects the lower winding portion 8b below the tangent line P2 of the pair of winding rolls by several tens of millimeters. The tension of the belt 8 can be adjusted.

The belt receiving rolls 10a and 10b are located inside the belt winding and at two positions on both sides with the center of the winding portion 8a on the cutter roll side as the center of the gap. The belt receiving roll 10a is attached to the frame 11 so as to be guided in the vertical direction, and is supported by the bearing device 15 whose height can be adjusted by turning the knobs 15a at both ends, and the belt receiving roll 10b is the frame. It is attached to the shaft 11 so as to be guided in the vertical direction, and the shaft portions at both ends are supported by a bearing device 16 whose height can be adjusted by turning knobs 16a. Similarly, the tension roll 14 is attached to the frame 11 so as to be guided in the vertical direction, and the shaft portions at both ends are gripped by the knobs 17.
It is supported by a bearing device 17 whose height can be adjusted by turning a. The belt receiving rolls 10a and 10b are not located at positions directly receiving the pressure of the cutter blade 9b and the pillow portions 9c and 9c with the steel belt 8 sandwiched therebetween, and a pair of winding portions 8a of the steel belt 8 on the cutter roll side are provided. A steel belt 8 which is stretched outside the tangent line P of the winding roll and has elasticity is elastically pressed against the cutter blade 9b and the pillow portions 9c, 9c.

The power of the motor 19 mounted so as to directly rotate the winding roller 7b on the downstream side is transmitted to the winding roller 7a on the upstream side through the sprocket 20, the chain 23 and the sprocket 21. In addition, it is transmitted to the die cutter roll 9 through the sprocket 22 and the gears 24, 25 and 26, and further, the pair of pinch rolls 12a and 12 on the upstream side.
b is the winding roll 7a on the upstream side and the gears 29, 30, 3
1 and 32, and the pair of downstream pinch rolls 13a and 13b are transmitted via the downstream winding roll 7b and the gears 29, 30, 31, 32. Therefore, the steel belt 8 rolls and rotates with respect to the cutter blade 9b and the pillow portions 9c, 9c of the die cutter roll 9 and in synchronization with the traveling speed of the thin film web W. It is supposed to be done. Either one of the belt receiving rolls may be used.

In the die cutter roll 9, a cutter blade 9b having a blade length (height from the base circular diameter peripheral surface 9a) of, for example, 10 to 15 mm is planted at a required position on the base circular diameter peripheral surface 9a and has a flat surface. The developed shape is a required curved shape, and the height from the circumferential surface 9a of the base circle is, for example, 0.2 m higher than the blade length of the cutter blade 9a.
m Lower pillow parts 9c, 9c are cutter blades 9 with a base circle diameter peripheral surface 9a
It is provided at both side positions sandwiching b. The length of the steel belt 8 is relatively determined so as not to be a multiple of the circumferential length of the pillow portion 9c of the die cutter roll 9.

Then, the continuous thin film web W folded in half so as to have a half width on the upstream side is formed by the pinch roll 12.
is passed between a and 12b and guided to the upper surface of the steel belt 8,
The lower side of the die cutter roll 9 is passed between the pillow portions 9c and 9c, and is passed between the pinch rolls 13a and 13b. A web piece suction duct 18 for sucking and removing the web piece W ′ cut off near the downstream side of the die cutter roll 9 is provided, and the web floating prevention guide 27 supported by the bracket 28 is provided on the die cutter roll 9. The thin film web W is prevented from rising at a position opposite to the web piece W ′ that is cut off near the downstream side.

Next, the operation of the first embodiment constructed as above will be described. When the motor 19 is driven, the thin film web W is folded in two so as to have a half width on the upstream side between the pinch rolls 12a and 12b and 13a and 13b.
Are transferred on a steel belt 8. The height of the pillow portions 9c, 9c is lower than the blade length of the cutter blade 9a by a required minute dimension, and the pillow portions 9c, 9c suppress the push-cutting force of the cutter blade 9b to an appropriate level. And
The steel belt 8 is appropriately tensioned by the tension roll 14, and the belt receiving roll 10
Since a and 10b do not directly receive the pressure of the cutter blade 9b and the pillow portions 9c and 9c with the steel belt 8 sandwiched therebetween, the pillow portions 9c and 9c contact the steel belt 8 at an appropriate contact pressure. Then, the thin film web W on the steel belt 8 is cut into a semi-elliptical shape with a clean cut hole. The web piece suction duct 18 sucks and removes a web piece W'which is hollowed out in a substantially semi-elliptical shape. Since the length of the steel belt 8 is not a multiple of the circumferential length of the pillow portion 9c of the die cutter roll 9, the portion of the steel belt 8 that receives the cutter blade 9b does not have a fixed position and is displaced by the required dimension. To go. In addition, when the two-folded thin film web W is opened, the web W has a substantially elliptical shape.

[0016]

As described above, according to the continuous thin film web hard cutting apparatus of the present invention, the cutter blade of the die cutter roll is received by the steel belt having elasticity and the cutter blade. By gradually changing the position of the steel belt, the cutter blade is given an appropriate amount of push-cutting force and the linear recesses that occur in the steel belt that receives the cutter blade are not concentrated in one place. Even if the cutter blade wears a little, the uniformity of contact between the cutter blade and the member that receives the cutter blade is kept good for a long period of time, and the push-cutting force remains constant and good. The length of the re-sharpening period is extended, and the length of time for reducing the diameter of the large diameter part corresponding to the shortening of the blade length due to the re-sharpening of the cutter blade is lengthened. It is possible to reduce the number of times to replace the member that receives the blade and the cutter blade, to avoid a temporary suspension of operation due to replacement, to greatly reduce the running cost, and in turn, the product cost of a toilet sheet etc. made by processing a continuous thin film web. Can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a plan view, (b) is a vertical sectional front view, and (c) is a perspective view of an essential part of a hard-cut device for a continuous thin film web according to an embodiment of the present invention.

2A and 2B are schematic perspective views showing different conventional examples for explaining a hard cutting method for a thin film web.

3A and 3B are schematic perspective views showing different conventional examples for explaining a soft-cut method for a thin film web.

[Explanation of symbols]

 7a, 7b ・ ・ ・ Roll for winding 8 ・ ・ ・ Steel belt 9 ・ ・ ・ Die cutter roll 9a ・ ・ ・ Base circle peripheral surface 9b ・ ・ ・ Cutter blade 9c ・ ・ ・ Pillow part 10 ・ ・ ・ Belt Receiver roll

Claims (1)

[Claims] 1. An endless steel belt is wound around a pair of winding rolls so that the tension can be adjusted, and at the position corresponding to approximately the center between the winding rolls, the outside of the steel belt is wound. The cutter blade has a constant blade length and a flat development shape that is a required curved shape so that the circumferential surface of the base circular surface is slightly separated by the required small dimension. A belt provided so that a die cutter roll having a pair of pillow portions whose heights are required to be small by a small dimension at both sides of the cutter blade on the circumferential surface of the base circle is located inside the winding of the steel belt. By the receiving roll, the tension of the winding part on the cutter roll side of the steel belt comes outside the tangent line of the pair of winding rolls, and the steel belt is pressed against the cutter blade of the die cutter roll and the pillow part. A continuous thin film web hard-cutting device, characterized in that the length of the steel belt is not a multiple of the circumferential length of the pillow portion of the die cutter roll.