JPH07343B2 - Bubble stabilizer in blown film molding machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a bubble stabilizer in an inflation film molding machine.

(Prior Art) and (Problems to Solve the Invention) Conventionally, a bubble stabilizer using a coil spring filament has been disclosed in Japanese Patent Application Laid-Open No. 62-37125, Japanese Patent Application No. 60-17676. However, this had to facilitate the attachment of the filament.

(Means for Solving Problems) In the present invention, a support shaft 9 having one end fixed to the die 22, a small wheel 8 and a large wheel 4 fixed to the support shaft 9 in an up-down arrangement,
Bubbles in an inflation film molding machine provided with a large number of long coil springs 19 stretched in a tension state slightly inclined in the circumferential direction between the outer peripheral edge of the small wheel 8 and the outer peripheral edge of the large wheel 4. In the stabilizer, a large number of through holes 7, 3 are provided at predetermined intervals on the outer peripheral edge of the small wheel 8 and the outer peripheral edge of the large wheel 4, and the long coil springs are provided in these through holes 7, 3.
To provide a valve stabilizer in an inflation film molding machine, which is characterized in that 19 is stretched by sequentially forming the following items (1) to (3).

One end of the long coil spring 19 is inserted into one of the two adjacent through holes of the small wheel 8 from the outside toward the inside and then into the other through hole from the inside toward the outside.

The one end is inserted into one of the two adjacent through holes of the large wheel 4 through the outside of the outer peripheral surface of the small wheel and the outside of the outer peripheral surface of the large wheel from the outside toward the inside and then to the other through hole. Insert from the inside to the outside.

Both ends of the short body 18 made of a coil spring, which is thinner than the long coil spring 19, are screwed into the one end and the other end of the same long coil spring 19 to connect the both ends.

(Embodiment) In the embodiment shown in the drawing, a large wheel 4 is provided with a boss 2 around an axial hole 1 and a large number of through holes 3 vertically penetrating the periphery thereof.
And a small wheel 8 having a boss 6 around the shaft hole 5 and having a plurality of through holes 7 penetrating vertically in the peripheral edge thereof are rotatably and slidably fitted to a single support shaft 9. The bosses 2 and 6 of the large wheel 4 and the small wheel 8 are fixed to the support shaft 9 with screws 10 and 10 'so that they cannot rotate and slide, and the large wheel 4 and the small wheel 8 are attached to the support shaft 9. An outer tube 11 and an inner tube 12 are slidably attached to a portion between and, the upper end of the outer tube 11 is connected to the small wheel 8 by a screw 13 and a boss 14, and the lower end of the inner tube 12 is connected to the large wheel 4. Press it against the upper surface and screw the lower end of the outer tube 11 to the upper end of the inner tube 12.
The distance between the large wheel 4 and the small wheel 8 is determined by fastening with 15 and a long coil spring 19 is provided between the through hole 7 in the small wheel 8 and the through hole 3 in the large wheel 4 at one end of the long coil spring 19. Is inserted into one of the two adjacent through holes of the small wheel 8 from the outside toward the inside and then into the other through hole from the inside toward the outside.

The one end is inserted into one of the two adjacent through holes of the large wheel 4 through the outside of the outer peripheral surface of the small wheel and the outside of the outer peripheral surface of the large wheel from the outside toward the inside and then to the other through hole. Inserting from the inner side toward the outer side, screwing both ends of a coil spring short body 18 that is one size thinner than the long coil spring 19 into the one end and the other end of the same long coil spring 19 to form an endless ring shape. The bubble stabilizer 21 is constructed by tensioning the bubble stabilizer 21 in a tensioned state slightly inclined in the circumferential direction, and the bubble stabilizer 21 is placed at the center of the die 22 with a large wheel 4.
Is the one that is laid vertically so that it is farther than the die 22.

In the above example, the molten tubular body 24 of polyolefin resin is extruded from the die 22, the lower end of the molten tubular body 24 is sandwiched between pinch rolls (not shown), and air is blown into the molten tubular body 24. An inflation film is formed by forming a means for continuously winding the film that has passed through the pinch roll while being blown into a predetermined size by being blown from the air outlet 23.

Further, in the above-mentioned molding, the inner surface of the part 28 which is on the verge of the funnel-shaped enlarged portion 27 of the bubble 26 is brought into soft contact with the long coil spring 19 of the bubble stabilizer 21 to reach the above-mentioned part 28. In particular, the inner surface of the molten linear polymer resin is slid in an oblique direction and kneaded. By this kneading, the horizontal and vertical orientations of the linear polymer are more balanced and the slanted direction is slid. The thickened portion and the thinned portion are made uniform in thickness and moved to the enlarged portion 27 so as to be stretched in the lateral direction and the longitudinal direction, and further fed from the outlet 23 as shown in the drawing. When air flows into the enlarged portion 27 of the bubble 26 through the space between the long coil springs 19, the molten tubular body 24
The air ring 29 is cooled from the inside by supporting the cooling effect of the air ring 29 from the inside.

(Operation) and (Effect of the Invention) Since the present invention has the above-described configuration, the long coil spring
The attachment of 19 can be made extremely easy by means of passing the long coil spring 19 through the through holes 7 and 3 and means of screwing a thin coil spring short body 18 at both ends of the same long coil spring 19. It has an excellent effect of being able to sufficiently achieve the desired purpose.

[Brief description of drawings]

FIG. 1 shows an embodiment of a bubble stabilizer in the blown film molding machine of the present invention. FIG. 1 is an overall front view, FIG. Three
The figure is an enlarged perspective view of a main part, and FIG. 4 is a partially cutaway front view showing a joint at both ends of a long coil spring. 1 ... Shaft hole, 2 ... Boss, 3 ... Through hole, 4 ... Large wheel, 5
...... Axial hole, 6 ... Boss, 7 ... Through hole, 8 ... Small wheel, 9 ...
… Spindle, 10, 10 ′ …… Screw, 11 …… Outer tube, 12 …… Inner tube,
13 …… screw, 14 …… boss, 15 …… screw, 18 …… short body,
19 …… Long coil spring, 21 …… Bubble stabilizer, 22 …… Die, 23 …… Blowout port, 24 …… Melting tubular body, 26 …… Bubble, 27 …… Enlarged part, 28 …… Short part, 29 …… Cooling air ring.

Claims (1)

[Claims] 1. A support shaft 9 having one end fixed to a die 22, and a small wheel 8 and a large wheel 4 fixed to the support shaft 9 in a vertically arranged manner.
And a large number of long coil springs 19 stretched between the outer peripheral edge of the small wheel 8 and the outer peripheral edge of the large wheel 4 in a tension state slightly inclined in the circumferential direction. In the bubble stabilizer, a large number of through holes 7, 3 are provided at predetermined intervals in the outer peripheral edge of the small wheel 8 and the outer peripheral edge of the large wheel 4, and these through holes 7,
3. A bubble stabilizer in an inflation film molding machine, wherein each of the long coil springs 19 is stretched in the order of 3 to 3. One end of the long coil spring 19 is inserted into one of the two adjacent through holes of the small wheel 8 from the outside toward the inside and then into the other through hole from the inside toward the outside. The one end is inserted into one of the two adjacent through holes of the large wheel 4 through the outside of the outer peripheral surface of the small wheel and the outside of the outer peripheral surface of the large wheel from the outside toward the inside and then to the other through hole. Insert from the inside to the outside. Both ends of the short body 18 made of a coil spring, which is thinner than the long coil spring 19, are screwed into the one end and the other end of the same long coil spring 19 to connect the both ends.