JPH0345792Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a stabilizer used in a blown film manufacturing apparatus.

[Conventional technology]

As shown in FIG. 6, an apparatus for manufacturing blown film usually involves extruding a molten thermoplastic synthetic resin material from an annular slit in a die b attached to an extrusion molding machine a to form a cylindrical bubble c.
This is cooled and fixed in an air ring d above the die b, and is expanded and thinned by blowing air into the inside, and this bubble c is
After being flattened between a pair of stabilizing plates e suspended in a V-shape, the material is sandwiched between pinch rolls f and wound onto a take-up roll g.

For example, as shown in FIG. 6, the conventional stabilizing plate e is made up of a plurality of rollers j having both ends pivotally supported on both side plates h of a rectangular frame at intervals in the vertical direction. By changing the opening angle of the set of stabilizers e using an adjustment device k, the folding angle of the bubble c relative to the stabilizer plate e can be adjusted.

[Problem that the invention attempts to solve]

The stabilizing plate using rollers as described above has a small contact area with the bubble and low resistance, so it has the advantage of being able to wind up the film at high speed and increasing production capacity.

However, for example, when forming an inflation film such as a hard high-density polyethylene film that requires increasing the air inside the bubble, the film surface is strongly pressed against the roller due to this internal pressure, causing the stabilizer to Because the film falls into the V-shaped gap between the rollers and is sent to the pinch rollers, the bubble shakes, causing vertical wrinkles in the wound film, reducing its product value and sometimes making it impossible to form the film. There is a problem.

Therefore, in this case, a lattice-like stabilizing plate is used in which multiple wooden boards are arranged above and below parallel to a rectangular frame, but since the contact resistance with the film increases, it is necessary to increase the speed. This is not possible and is inefficient.

In addition, a stabilizer using this wood board has a high resistance value, so if it is used to mold a soft resin such as a linear low-density polyethylene film, the film will be damaged. Therefore, it is necessary to use a stabilizer using rollers as described above.

In this way, depending on the properties of the resin to be molded,
Changing the stabilizer every time requires time and effort, and the production of the film is stopped during the replacement time, which lowers the operating rate. In addition, in order to prepare a large number of stabilizers according to the type of resin,
There is also the problem of cost.

[Means for solving problems]

In the present invention, a plurality of rollers are arranged side by side at intervals in an opening of a base frame, and a guide plate is provided between each roller so that the guide surface can protrude and retract from the circumferential surface of the rollers.

[Effect]

When using hard resin materials, each guide plate can be retracted so that only the rollers are in sliding contact with the film.
Further, when using a soft resin material, each guide plate is made to protrude between the rollers, and only the guide plate is brought into sliding contact with the film.

〔Example〕

Hereinafter, the present invention will be described in detail based on an illustrated embodiment.

1 is a rectangular base frame with a pair of left and right side plates 1
a, 1a, and a pair of upper and lower spacing members 1b, 1b that connect the upper and lower ends of these side plates 1a, 1a, and a base frame 1 is attached to the frame of the film manufacturing apparatus at the upper end of each side plate 1a. Horizontal shafts 2 for mounting are provided protruding left and right, respectively.

3 is a roller, and shafts 3a, 3a at both ends thereof are:
It is pivotally supported by the side plates 1a, 1a, respectively.
In the embodiment, seven rollers 3 are arranged vertically at equal intervals.

The outer periphery of the back surface of each roller 3 protrudes from the rear end surface of each side plate 1a, and as shown in FIG. It forms a folding guide surface.

Reference numeral 5 denotes a rectangular moving frame slightly smaller than the base frame 1, which is composed of a pair of left and right side plates 5a, 5a, and spacer plates 5b, 5b connecting the upper and lower inner sides thereof, and the side plates include: Mounting holes 6a at the top and bottom ends
However, between the mounting holes 6a, adjustment holes 6b of a guide plate 7, which will be described later, are bored at equal intervals.

Reference numeral 7 denotes a guide plate, which is made of a sliding contact material 7b made of a material with low thermal conductivity and having a half-moon cross section fixed to the rear surface of a plate material 7a facing in the left-right direction, and on the left and right ends of the front surface, A screw rod 7c facing front and rear is installed.

The front end of the screw rod 7c is inserted into the through hole 6 of the moving frame 5, and is attached to the moving frame 5 by being tightened with a pair of front and rear nuts 8. By arranging a plurality of these guide plates 7 (six in the embodiment) spaced apart from each other above and below, the movable frame 5 has a parallel lattice shape when viewed from the front.

As shown in FIG. 2, threaded rods 9 facing forward and backward are installed at the left and right ends of the pair of upper and lower spacing members 1b, and these four threaded rods 9 are attached to the four corners of the moving frame 5. The through hole 6b is inserted, and a pair of front and back nuts 1 are inserted.
0, and each guide plate 7 can move rearward from between the rollers 3.

The stabilizer plate 11 configured as described above is a sixth embodiment of the conventional technology of the blown film manufacturing apparatus.
As explained in the figure, one pair of left and right plates are suspended in the shape of an "eight," and this one pair of stabilizers 11, 11
The film 4 passing through the space is folded from a cylindrical shape to a flat shape.

When the film to be manufactured is made of a hard resin material, only the rollers with the guide plate 7 submerged are brought into contact between the rollers 3 and 3 as shown in FIG. If the film is a soft resin material,
As shown in FIG. 4, the moving frame 5 is brought close to the base frame 1, the guide plate 7 is made to protrude from between the rollers 3,
It is used in a state in which the film is guided by a series of guide plates 7 in contact with only the guide plates.

Further, as shown in FIG. 3, the moving frame 5 may be moved by operating the nut 10 of the screw rod 9 so that the surfaces of the roller 3 and the guide plate 7 are aligned on the same plane. can.

Furthermore, as shown in FIG. 5, by individually adjusting the amount of feed of each guide plate 7 from the movable frame 5 and freely changing the relative position with respect to the adjacent roller 3, the film can be It is also possible to prevent wrinkles from forming in some areas.

[Modification] In the embodiment described above, the guide plate is attached to the moving frame, but instead of this, the guide plate may be attached to the base frame so as to be individually adjustable.

The guide plate may be a flat plate made of synthetic resin in addition to a wooden board, and the material is not limited as long as it has low thermal conductivity.

[Effect of idea]

The stabilizer according to the present invention can use either the roller or the guide plate as required, so one unit can
It has the advantage of being compatible with both hard and soft resins.

Furthermore, contact resistance can be adjusted by adjusting the amount of feed of the guide plate provided between the rollers, so it is possible to prevent the occurrence of vertical wrinkles in the film.

In the case of high-density polyethylene (HDPE), conventional
By reducing the resistance of the stabilizer compared to a stabilizer consisting only of fixed bodies, the take-up speed can be increased and production can be increased.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the present invention, FIG. 2 is a vertical sectional view taken along the line - in FIG. 1, and FIGS. 3 and 4 are guide plates for the rollers in FIG. Unlike FIG. 3, FIG. 5 is an enlarged longitudinal sectional view showing a state in which the amount of extension of each guide plate is changed, and FIG. 1 is a schematic configuration diagram showing a conventional blown film manufacturing apparatus. 1... Base frame, 1a... Side plate, 1b... Spacing material,
3...Roller, 4...Film, 5...Moving frame,
5a... side plate, 5b... spacing material, 7... guide plate,
7c, 9... Screw rod, 8, 10... Nut, 11
...Stable plate.

Claims (1)

[Claims for Utility Model Registration] (1) A plurality of rollers are arranged in parallel at intervals in the opening of the base frame, and a guide plate is provided between each roller so that the guide surface can protrude and retract from the roller circumferential surface. Stabilizer plate for blown film manufacturing equipment. (2) In practical use, each guide plate has its base end attached to a movable frame, and the movable frame is movably attached to a base frame, so that each guide plate can integrally move in and out between the rollers. A stabilizer plate for a blown film manufacturing apparatus according to claim (1) of patent registration. (3) The stabilizing plate for the blown film manufacturing apparatus according to claim (2) of the utility model registration, in which the installation length of the guide plate to the moving frame can be adjusted individually.