JPH0730347Y2 - Stabilizer for film forming equipment - Google Patents

Description

[Detailed Description of Device] a. Purpose of the Invention <Industrial Application Field> The present invention relates to a stabilizer for guiding a film in a film forming apparatus.

<Prior Art> Conventionally, in a film forming apparatus for inflation-molding a tubular film made of a synthetic resin of this kind, a tubular film extruded from an extruder through a forming die is formed into a sheet and taken off. In this case, the tube-shaped film is guided between the pair of stabilizers so that both side surfaces come close to each other, and the tube-shaped film coming out from between the pair of stabilizers is pulled by the pair of pinch rollers to remove both side surfaces. The sheet-like film is formed by closely adhering.
The pair of stabilizers are provided on both sides of the moving tubular film so as to face each other along the moving direction thereof, are inclined so as to approach each other from the film inlet side toward the film outlet side, and the tubes of the respective stabilizers are provided. There are those in which a flat plate structure having a surface plate surface in contact with a film-like film or a bar structure in which a plurality of rods are attached at intervals along the film moving direction is used.

Further, the applicant of the present invention has developed a stabilizer in which a large number of rollers are supported on the same shaft for each step (Japanese Utility Model Publication No. 55-21781). In the stabilizer having the rollers, the tubular film is a flat tube in which both side surfaces are brought into contact with the respective top pieces of the stabilizer to move while applying tension in the moving direction by the pinch rolls.

Also, since this type of film forming device inevitably causes uneven thickness depending on the location in the circumferential direction, if it is flattened and wound as it is, a part of the film with a large thickness becomes bulky, and the film in that part becomes bulky. Is always given a tensile force even during storage, and when it is unwound, it causes a relaxation in that part, which deteriorates the quality of the film.

Therefore, in order to remedy this drawback, the film is wound into a roll by slowly swiveling or reciprocating around the axis of the tubular film together with the pinch roller or skewed roller, the stabilizer and the winding device. In this case, the thick portion is sequentially displaced in the width direction so that the winding diameter when wound in a roll shape is constant over the entire width so that a relaxation portion does not occur in a part of the film. It has been known.

Alternatively, there is also known a device in which the winding device described above is fixed in position, and a stabilizer and a skewed roller are sequentially reciprocally rotated around a vertical axis by a special machine to wind as a flat tube.

<Problems to be Solved by the Invention> However, in this stabilizer having a flat plate structure, since the tubular film makes sliding contact with the surface portion, the frictional resistance is large, which causes a limitation on the movement of the film. Also,
Since the frictional resistance is large, an extra tensile stress is applied to the tubular film passing through the stabilizer, and the stress is released after the passage, so that intermittent tensile strain occurs in the tubular film.

Further, in the stabilizer having a rod structure, due to air contained in the tubular film, a difference in expansion occurs between the portion in contact with the rod and the portion not in contact with the rod, and a difference in expansion occurs. When the rods of the stabilizers are provided facing each other, a gourd-shaped neck is formed. When the rods are provided in different stages, there is a drawback that the tubular film meanders and moves.

Further, the stabilizer with a roller and the film made of synthetic resin developed by the applicant of the present invention, the width gradually expands as the stabilizer becomes flatter, and both sides of the film expand toward the outside. However, since the rotation axis of each roller is horizontal, the rotation surface of each roller is vertical, so that the direction in which these rollers guide the film also acts vertically to form a flat tube. A plurality of wrinkles along the longitudinal direction are formed in the portion, which deteriorates the quality of the film. The case where the tubular film is wound as a flat tube is no exception, and longitudinal wrinkles are formed on both side surfaces of the tubular film pulled by the pinch rolls, and wrinkles remain after being formed into a sheet film. Therefore, when it is used as a flat film band, the vertical wrinkles of both side ears are cut off and wound up.

In the conventional art, in the device for reciprocally rotating the pair of stabilizers together with the squeeze roll around the axial direction of 180 to 360 degrees to wind the film onto a cylindrical film, the entire tubular film is stable. Since it is offset in the circumferential direction with respect to the plate, it is supposed that the surface of the stabilizer will be
Even if a large number of rollers are provided as in Japanese Patent Publication No. 1, there is a risk that the twisted wrinkles of the tube may be entirely due to the deviation between the rotating surface of these rollers and the moving direction of the tube.

The purpose of this invention is to solve the above-mentioned problems all at once, and to obtain a stabilizer that does not have wrinkles on both sides of the flat tube and that does not have twisted wrinkles even when winding while rotating as described above. To do.

B. Configuration of the Invention <Means for Solving the Problems> In order to solve the above-mentioned problems, the invention is directed to a tube-shaped film that is inflation-molded in a sheet-like shape, and the two side surfaces of the tube-shaped film are separated from each other. In the guide to approach, a large number of balls that come into contact with the side surface of the moving film and freely rotate in any direction are arranged in a staggered manner in the stabilizer main body along the moving direction of the film. It is used as a stabilizer in a film forming device.

The ball body is preferably a ball caster in terms of cost.

In terms of contact resistance with the film, it is preferable that the balls of the ball casters are made of fluorocarbon resin coated titanium balls.

<Operation> The operation of the present invention configured as described above is as follows.

The tubular film passing and moving in contact with the group of balls disposed on the stabilizer body is expanded toward both outer sides, and each ball is rotated in the direction of expansion of the tube to move the balls into contact with each other. Since the film is in perfect rolling contact, wrinkles do not occur, and a good sheet-like film is formed, and it is taken over without meandering without causing tensile strain without excessive biased stress being forced. .

In addition, even if the stabilizer is used in a winding device and the stabilizer is reciprocally rotated by 180 to 360 degrees, the whole film which is in contact with the ball body group of the stabilizer is freely rounded. The tube-shaped film moves between the stabilizers by changing the movement in the circumferential direction and without generating twisting wrinkles.

When the ball body is used as a ball caster, rolling contact becomes smoother, and if the ball of the caster is a ball coated with a fluororesin, fusion with the film does not occur during rolling contact.

<Example> Next, a typical example of the present invention will be described.

<First Embodiment> In FIG. 1, A is a film forming apparatus using a pair of stabilizers 10. Each stabilizer 10 is provided on a main frame above a forming die 12, and a pair of stabilizers is provided above the stabilizer. Pinch roll 11
Is provided. The pair of stabilizers 10 is a tubular film 5
Are arranged on both sides of the film along the moving direction thereof, and the film inlet side end portion is opened wider than the tubular film diameter, and the film outlet end portion is inclined so as to approach. The opening of the pair of stabilizers 10 can be adjusted by an opening adjustment mechanism (not shown).

The stabilizer main body 13 in each of the stabilizers 10 is a rectangular plate, and the tubular film F of the stabilizer main body 13 is formed.
The surface portion that comes into contact with the plurality of ball casters is spaced in the longitudinal direction (film moving direction) and the width direction.
The ball casters 14 are arranged in a staggered manner along the moving direction of the film, which is formed by contacting the stabilizer body 13 with the side surface of the film 13 freely in any direction and rotating. Are arranged in a shape and attached.

The sphere of the ball caster 14 is preferably a ball coated with a fluororesin.

In this embodiment, the ball casters 14 are arranged on the entire surface of the pair of stabilizers, but the invention is the same even if the ball casters 14 are provided only on the portions that come into contact with the tubular film F. .

<Operation of the First Embodiment> The operation of the stabilizer 10 of the first embodiment thus configured is as follows.

The tubular film F extruded from the forming die 12 enters between the lower end portions of the pair of stabilizers 10 and moves between the surface portions thereof, while the both side surfaces of the film are on the surface of each stabilizer plate 10. Contacting the spheres of a large number of ball casters 14 forming the part, and bringing them close to each other, the flat tube T
Is taken up by the pair of pinch rolls 11 from between the upper end portions.

At this time, the film F, which is taken along with the contact between the ball caster group 14 of the pair of stabilizers 10 and the film F, gradually becomes flatter and spreads in the width direction.
The spheres of each ball caster 14 are independently rotated in the moving direction of the portion of the tubular film F which is in contact with the sphere. Therefore, the tubular film F passing through the pair of stabilizers 10 can freely expand without wrinkling in the longitudinal direction, and can be folded into a good flat tubular film T by the pair of pinch rolls 11.

(Second Embodiment) <Refer to FIG. 4> A second embodiment is an embodiment in which the stabilizer 10 of the first embodiment is used in a winding device B for an inflation film.

In this embodiment, the same reference numerals as those in the first embodiment have the same configurations and operations, and in the second embodiment,
An auxiliary frame 20 equipped with the stabilizer 10 and the squeeze rollers 27 and 28 and a winding device B is installed on the main frame 21 of the film forming device A so as to be rotatable around the center line of the forming die.

This auxiliary frame 20 is rotated 180 degrees to 3 degrees by a geared motor 26.
It is equipped so that it can reciprocate every 60 degrees.

(Operation of Second Embodiment) The operation of the winding device B in this embodiment configured as described above is similar to that of a known winding device, in that the gear motor 26 causes the entire auxiliary frame 20 to reciprocally rotate about its rotation axis. The flattening direction of the tubular film F is sequentially changed, and is wound by the winding device B.

When the stabilizer 10 is rotated 180 degrees to 360 degrees in a reciprocating reciprocating manner, the tubular film F freely slides in the circumferential direction on the group of ball casters 14 arranged in a staggered manner on the stabilizer 10 to form a sheet-like film T. It is evenly flattened and wound without twisting wrinkles.

C. Effect of the Invention The stabilizer of the invention constructed and configured as described above has the following effects.

That is, since a large number of balls are arranged in a staggered manner on the stabilizer body, the tubular film that passes through the balls in contact with each ball is freely expanded toward both outsides, and both sides of the film become flat tubes. A good sheet-like film T can be formed without wrinkles.

Further, since the tubular film makes rolling contact with each ball, it has a small frictional resistance and can pass and move well, and the smoothness of the film surface is not deteriorated.

Also, it is possible to prevent a gourd-shaped crack and meandering movement.

Further, when the stabilizer is rotated around the axial direction in which the film is extruded, even when the tube-shaped film is wound as a flat tube, each ball member can rotate in any direction. The tubular film can be wound without twisting and wrinkling.

When the ball of the ball caster is a ball coated with a fluororesin, the contact resistance between the film and the ball can be further reduced, fusion between the film and the inflation film does not occur at all, and thermal diffusion of the film occurs. Can be promoted.

[Brief description of drawings]

1 is a schematic view of a first embodiment of the present invention, FIG. 2 is a side view of a stabilizer, FIG. 3 is a side view of a ball caster, and FIG. It is a schematic diagram of a 2nd example. Explanation of main symbols in the figure 10 …… Stabilizer, 14 …… Ball casters.

Claims (3)

[Scope of utility model registration request] 1. A guide for guiding both sides of a tube-shaped film that has been inflated so as to approach each other when the tube-shaped film is drawn into a sheet, and which is in contact with the side surface of the moving film. A stabilizer plate in a film forming apparatus, in which a large number of balls that freely rotate in a direction are arranged in a zigzag manner on the stabilizer body along the moving direction of the film. 2. A stabilizer for a film forming apparatus according to claim 1, wherein the ball body is a ball caster. 3. The stabilizer plate in the film forming apparatus according to claim 1, wherein the balls of the ball casters are balls coated with a fluororesin.