JPS6368394A - Method of treating lug end of sheet - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a technology for processing the edge portion of clothing such as paper 2 synthetic paper, metal foil, plastic film, etc. The present invention relates to a technology for crushing the edge portion of the ear.

<Prior art and its problems> Since the central part of clothing is made into a product during the manufacturing process, the ends of both ears may have to be separated. In the case of sheets or films made of plastics (hereinafter referred to as sheets), both ends of the cut tape are crushed,
May be used again. Techniques for crushing edges of plastics are well known, in which a tape-like edge is crushed into fine powder using a fixed blade or a rotating blade.

By the way, the ends of both ends of the sheet are usually uneven in thickness, physical/mechanical properties, shape, etc. compared to the central part of the product, so it is necessary to cut them into tapes and grind them continuously. Sometimes, it can sometimes cause problems. For example, when the selvedge wraps around the rotary blade during crushing in a crusher, the abnormally increased tension applies to the slitter that cuts between the product part and the selvedge end, resulting in slitting errors and cutting of the product part.

This may lead to accidents such as breakage. Especially in the case of thin sheets, the product part is thin and reconstructed.Since the part becomes quite thick, slitting errors are likely to occur, and the edge part is simply crushed! 2! l! Problems in the manufacturing process can cause production machinery to stop, affecting product yields and operating rates.

Therefore, the inventor of the present invention conducted intensive research into a method for processing the edge portion without causing any trouble, and as a result, discovered the main cause of the trouble and found a solution to the problem.

In the prior art, in the pre-winding process of the sheet, the product part and the edge part are slit using a razor blade, a heating wire, etc., the tape-shaped edge part is taken out, and the edge part is removed using a take-up roll or an air conveying means. The end portion is continuously fed into a crusher.

However, when the continuously fed tape-shaped edges are processed by a crusher, cutting defects may occur. This state is shown in FIG. 3, and the tape-shaped edge 2 is
It is introduced forward by a feed roll 61 into the crusher. Then, between the fixed blade 63 and the rotary blade 64, it is pulverized into almost powder particles. However, the edges that are not cut or crushed near the fixed blade are wound up by the rotating blade, and the edges are therefore strongly pulled toward the rotating blade. Such a sudden change in tension causes the following trouble.

(a) The increase in tension of the tape-like material at the end of the edge rises in the opposite direction to the slit. At the slit position, the balance of tension between the product part and the selvedge part is lost, resulting in mis-slits or tearing of the ramie-made part, which is thinner than the selvedge part.

(0) A tape-like object may break during transportation due to a sudden change in tension. Troubles such as the tape-shaped edge end winding around the feed roll will occur.

These (a) and (c1) problems may extend to the product, so as mentioned above, production and processing may have to be temporarily halted to take measures, resulting in lower operating rates. This directly affects problems such as the decline in

<Problems to be solved by the invention> An object of the present invention is to provide a new and efficient means for smoothly crushing the edges of a sheet.

<Structure of the Invention> The present invention provides a coarse crushing means between an edge take-up roll and a crusher, and forcibly cuts (shreds) a continuous tape-shaped edge into short pieces by the coarse crushing means. , and shredded F422 are pulverized by the pulverizer.

The present invention will be explained.

FIG. 1 is a schematic diagram of a sheet edge processing apparatus for implementing the present invention. The sheet 7 is separated into a product portion 1 and an edge portion 2 by a slitter 9. (2) It is cut and separated into two parts. The product portion is wound up into a roll, for example, as shown. Then, the edge portion is crushed by a crusher 6 through a shooter 8 by a guide roll and an edge take-up roll 3. The present invention is characterized in that a coarse crushing means 4 is provided between the edge end take-up [1-ru] and the crusher. This coarse grinding means is shown in detail in FIG. The tape-shaped end 'P4 is sucked and cut into pieces by an ejector. The ear end portion 2 has an air inlet 43 connected to the blower 5 for air high-speed air flow or a cylinder 4.
4, and are torn and torn by the air flow. A blower is selected for the ejector so that the airflow is at an appropriate speed. The tape-shaped edge portion is blown off to a length of 1 to 2 mm inside the ejector, but since it is gradually torn into pieces, the impact when it is shredded is small, and tension fluctuations may have a negative effect on the direction of the edge take-up roller. do not have.

Although the ejector may not completely cut the tape-like edge, the airflow may damage the edge, so when it is guided into the crusher, and due to miscuts, the rotating blade Even if it begins to wrap around the edge, it is easily cut, and the tension fluctuations due to cutting are kept low, so there is no effect of the tension fluctuations going back through the edge take-up roll to the slit position.

A punching 66 is provided below the ejector to separate the air and the cut edge portion, and the shredded iV= can be sent to the crusher.

<Effects of the Invention> Tension fluctuations caused by miscuts during crushing do not go back to the slit position, and (a) the product part and the edge part are balanced and stabilized in tension at the slit position. There is no slitting error or sheet breakage due to tension imbalance.

(0) There is no need to cut the edge of the tape while it is being taken up and running, eliminating troubles such as loss of processing time and machine stoppage.

(c) By using an ejector as the coarse crushing means, it becomes possible to cut (roughly crush) the tape-like edge without causing upward tension fluctuations.

It has the following effects.

Note that omitting the crusher by using only a coarse crushing means such as an ejector, in other words, using a coarse crushing means as a substitute for the ejector is impossible if the coarse crusher uses rotating blades. This is because the problem of tension fluctuations caused by miscuts in the crusher cannot be solved.

The ejector has a simple structure, is an extremely trouble-free mechanism, and is easy to maintain and manage, and can be said to be advantageous to the implementation of the present invention.

<Example> ET of polyethylene terephthalate sheet (G is edge
Ru.

The thickness of the product part is 10μm, and the average thickness of the edge part is 180μm.
The conditions were as follows: a feeding speed of 2.3 m/sec at the edge end, a minimum diameter of the ejector of 130 mm, and a wind speed of 38 m/sec at a wind speed of 19 m3/min from the blower. This article (in PJi,
Frequency of troubles near the rotating blade of the crusher: 0.5
~1 time/24 hours, and the frequency of occurrence of trouble in which the tape-shaped edge end broke during transportation was about 0.5 times/24 hours.

Under the same conditions without using the ejector, the number of troubles occurring near the rotary blade was 6 times/24 hours, and the frequency of breakage of the edge end during transportation was 30 times/24 hours.

From this comparison, it can be seen that extremely stable processing of the edge portion is possible.

With the conventional technology, there were many troubles associated with the crushing process for extremely thin sheets (less than 5 μm), but with the method of the present invention, the edges of such sheets can be easily processed without any trouble. is possible.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram illustrating a method for processing the edge portion of a sheet according to an embodiment of the present invention. FIG. 2 is a longitudinal sectional view of the ejector used in the present invention. FIG. 3 is a longitudinal sectional view of a conventional edge crusher (or one that can be used in the present invention). In the drawings, 1 is the product part of the sheet, 2 is the edge part,
3 is an edge-end take-up roll, and 4 is an ejector. 5 is a blower, 6 is a crusher, and 7 is a sheet (whole). 8 is a chute pipe, and 9 is a cutter (slitter).

Claims (2)

[Claims] (1) When a sheet is separated into a product part and an edge part by a slitter, and the continuous tape-shaped edge part is led to a crusher by an edge edge take-up roll, the edge edge take-up roll and the crusher are A method for processing the edges of a sheet, which comprises: providing a coarse crushing means in between; forcibly cutting the edge portion into short pieces by the coarse crushing means; and further pulverizing the cut edge portion by the crusher. . (2) A method for treating an edge of a sheet according to claim 1, wherein the coarse crushing means is an ejector.