JPS6315216B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for cutting a thin film strip. For more details, see synthetic resin film, paper,
When winding a thin film strip such as fabric or aluminum foil onto a winding core and replacing it with a new winding core when the winding is full,
This invention relates to a method for cutting thin film strips.

When continuously manufacturing thin film strips such as synthetic resin films, paper, fabrics, aluminum foil, etc., the thin film strip is wound around a winding core, and when one winding core reaches full winding, a new winding is performed. A method is adopted in which the core is fed, the thin film strip is cut by a cutting blade, and the end of the thin film strip is wound onto a new core.

The cutting method for thin film strips that has been generally adopted in the past is as shown schematically in Figure 5A.
A cutting blade 52 is disposed near the winding core 51 which is arranged perpendicularly to the feeding direction of the thin film strip so as to be able to run parallel to the central axis of the winding core 51.
In this method, the cutting blade 51 is moved in the direction of the arrow to cut the thin film strip from one end to the other end in the width direction.

Thin film strip 53 when cut using this conventional method
Cut end (end to be wound into new winding core) 5
4, as shown in the plan view in FIG. 5(b), had the following drawbacks.

(1) When the width of the thin film strip is large, it takes time from the start of cutting to the end of cutting, so the cut end 54 has one end A in the width direction as the apex, as shown in FIG. It forms a right triangle, and this part becomes a rewinding loss.

(2) When using a thin film strip while unwinding a fully wound roll of the thin film strip as shown in Figure 5B, the cut end is closer to the winding core at one end in the width direction. The degree to which the diameter on the A side is larger than the diameter on the other end becomes noticeable, and undesirable phenomena such as one end A side of the thin film strip sagging or bending to the opposite side from the one end A occur.

(3) Furthermore, when the thin film strip is fed (or wound up) at high speed and the width of the thin film strip is large, it is difficult to bring the cut end 54 into close contact with a new winding core, resulting in wrinkles. These wrinkles are easily caused, and these wrinkles are transferred to other parts of the thin film strip, deteriorating the appearance of the product.

Under such circumstances, the present inventors have conducted extensive studies with the aim of providing a method for cutting thin film strips that eliminates the above drawbacks when producing thin film strips continuously at high speed. As a result, the present invention was completed.

However, the gist of the present invention is to continuously wind a thin film strip onto a winding core, cut it when the winding is full, and when winding the thin film strip onto a new winding core. A plurality of cutting blades, which are located at A method for cutting a thin film strip is characterized in that the blades are cut in mutually different directions at substantially the same speed.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings, but the present invention is not limited to the following examples unless the gist thereof is exceeded.

FIG. 1 is a schematic side view of the main parts of the device showing one embodiment of the present invention, FIG. 2A, FIG. 3A, and FIG.
Figure A is a schematic diagram showing an example of the arrangement of cutting blades for a new winding core, Figure 2B, Figure 3B, and Figure 4.
Figure B shows a plan view of the cut end of a thin film strip cut by the cutting blades shown in the respective figures. Fig. 5A shows an example of the arrangement of the cutting blade for a new winding core in a conventionally used device, and Fig. 5B shows the cutting of a thin film strip cut by the cutting blade shown in Fig. 5A. Ends shown.

In the figure, 1 is a thin film strip, 2 is a winding drum, 3 is a full roll, 4 is a new winding core, 5 and 6 are cutting blades, respectively, 21, 31, and 41 are new winding cores, 22, 23, 32, 33, 42, 4
3, 44, 45 are cutting blades, 24, 34,
46 are thin film strips, and 25, 35, and 47 are cut ends.

According to the present invention, the thin film strip 1 is continuously wound onto a winding core, cut when the winding is full, and cut with a plurality of cutting blades when winding is performed on a new winding core.

In the example shown in FIG. 1, the thin film strip 1 is fed in the direction of the arrow and wound onto a winding core placed in pressure contact with the circumferential surface of the winding drum 2, and the fully wound roll 3 is as follows:
The winding drum 2 is moved from the winding position to the full roll transfer position. During the transfer of the full roll to the full roll transfer position, a new winding core 4 is supplied to the thin film strip winding position by means not shown. In addition,
The winding position of the thin film strip may be a new winding core 4 in FIG. 1, or a fully wound roll 3 in FIG.
It may be in a certain position.

Next, the thin film strip is cut with a plurality of cutting blades, and the cut ends are wound onto a new winding core.

In the present invention, a plurality of cutting blades are positioned immediately before and after the new winding core and are movable at right angles to the feeding direction of the thin film strip, so that the cutting edges are doglegged or zigzag. The thin film strip is cut by causing the blade immediately before and the blade immediately after the winding core to travel in mutually different directions at approximately the same speed.

The plurality of cutting blades are arranged so as to be movable in a direction perpendicular to the feeding direction of the thin film strip. Moreover,
The cutting blades arranged in this way are located immediately before and after the new winding core, and the blades immediately before and after the winding core can run in mutually different directions. Furthermore, the plurality of installed cutting blades can run at approximately the same speed. By doing so, the plurality of cutting blades do not have to worry about colliding with each other while cutting the thin film strip, and it is possible to reduce rewinding loss at the cut ends.

In order to make it easier for the cut end of the thin film strip to be wound around a new winding core, apply adhesive to the new winding core or the end of the thin film strip, or use air suction as necessary. May be applied.

In Fig. 2A, a pair of cutting blades 22 and 23 are placed approximately in the center with a new winding core 21 in between, and run in mutually different arrow directions (one end in the width direction of the thin film strip). An example is shown below. Cut end portion 25 of the thin film strip cut by the cutting blade arranged in this way (end portion wound into a new winding core)
is as shown in the plan view in FIG. 2B.

FIG. 3A shows an example in which a pair of cutting blades 32 and 33 are positioned at the end of a thin film strip with a new winding core 31 in between, and are moved in mutually different directions of arrows. . The cut end portion 35 (the end portion wound into a new winding core) of the thin film strip 34 cut by the cutting blade arranged in this manner is as shown in a plan view in FIG. 3B.

Fig. 4A shows two pairs of cutting blades 42, 43 (these two blades constitute a pair), 44, 45 (these two blades constitute a pair).
The cutting blades constituting each pair are placed at a position where each pair is one-fourth of the width inside from both ends of the thin film strip, with a new winding core 41 in between. An example is shown in which the cutting blade is run in a direction different from that of the other cutting blades forming the pair. Thin film strip 46 cut by the cutting blade arranged in this way
The cut end 47 (the end to be wound around a new winding core) is as shown in a plan view in FIG. 4B.

Although FIGS. 2 to 4 show an example in which an even number of cutting blades are arranged, it is needless to say that the number is not limited to an even number, and an odd number may be used.

The present invention is as described above, and has particularly remarkable effects as described below, and its industrial utility value is extremely large.

(1) According to the method of the present invention, the cutting blades for cutting the thin film strip are placed just before and after the new winding, so the cutting edge can be cut into the new winding without the need for special equipment. It gets caught up in the winding core naturally.

(2) When using the method of the present invention, the rewinding loss that occurs when cutting a thin film strip can be reduced to approximately half that when using the conventional method.

(3) In the method of the present invention, when a plurality of cutting blades are used as cutting blades for cutting the thin film strip,
As shown in FIGS. 2B, 3B, and 4B, the cut ends are approximately symmetrical with respect to the central axis of the width of the thin film strip. Therefore, when using a thin film strip while unwinding a full roll of the thin film strip, the diameter at one end in the width direction may become larger than the diameter at the other end even when approaching the winding core. Otherwise, one end of the thin film strip may sag.
Unfavorable phenomena such as bending do not occur.

(4) When using the method of the present invention, the length cut by a single cutting blade is approximately half that of the conventional method, so wrinkles are less likely to occur at the cut end;
A roll product of a thin film strip with excellent appearance is obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of the main parts of the device showing one embodiment of the present invention, FIG. 2A, FIG. 3A, and FIG.
Figure A is a schematic diagram showing an example of the arrangement of cutting blades for a new winding core, Figure 2B, Figure 3B, and Figure 4.
Figure B shows a plan view of the cut end of a thin film strip cut by the cutting blades shown in the respective figures. Fig. 5A shows an example of the arrangement of the cutting blade for a new winding core in a conventionally used device, and Fig. 5B shows the cutting of a thin film strip cut by the cutting blade shown in Fig. 5A. Ends shown. In the figure, 1 is a thin film strip, 2 is a winding drum, 3 is a fully wound roll, 4 is a new winding core, 5 and 6 are cutting blades, respectively, 21, 31, 41, and 51 are new winding cores, 22, 23, 32, 33, 4
2, 43, 44, 45, 52 are cutting blades, respectively;
24, 34, 46, 53 are thin film strips, respectively;
25, 34, 47, and 53 are cut ends, respectively.

Claims (1)

[Claims] 1. When a thin film strip is continuously wound around a winding core, cut when the winding is full, and then wound onto a new winding core, the thin film strip is located immediately before and after the new winding core, and is positioned in the feeding direction of the thin film strip. A plurality of cutting blades that can run in a direction perpendicular to the winding core are cut in almost the same direction, with the blades immediately before and after the winding core running in different directions so that the cutting edges are doglegged or zigzag. A method for cutting a thin film strip, characterized by cutting by running at high speed.