JPS607132Y2 - Air volume adjustment device for air ring for synthetic resin film blow molding - Google Patents

Description

[Detailed description of the invention] This invention is supported on a die for synthetic resin blow molding, and the cooling air taken in from the air inlet on the outer periphery is passed through an annular nozzle opening protruding upward on the inner periphery. In nearing, the outer periphery of the semi-molten synthetic resin film cylinder is cooled by blowing out the cooling air and blowing this cooling air onto the outer periphery of the semi-molten synthetic resin film cylinder pulled out from the annular discharge port on the upper surface of the die. A large number of radial partition walls are provided at equal intervals in the air passage inside the near ring, and the opening degree of each lid piece, which is placed between the end surfaces of the partition walls of the bracket, is adjusted from outside the near ring using a thin shaft. By adjusting the amount of air passing between the partition walls near the air inlet of the near ring, the air pressure blown out from the nozzle opening on the inner circumference of the near ring is always uniform, and the surface of the synthetic resin film cylinder to be cooled is This invention relates to an air volume adjusting device for nearing for synthetic resin film blow molding, which prevents wrinkles and deflection phenomena caused by uneven air.

In order to obtain a high-quality cylindrical synthetic resin film by blow molding, it is absolutely necessary to stabilize the semi-molten cylindrical film exiting the die during film molding.

In order to stabilize this cylindrical film in a semi-molten state, the pressure of the cooling air blown out from the nozzle opening on the inner periphery of the near ring provided on the outer periphery of the outlet of the upward facing molding die must be uniform, and the cooling air must be uniform. It is desirable that the flow be laminar.

However, in the conventional flora molding circular ringing of this type of synthetic resin film, even if various internal devices are devised, it is difficult to equalize the pressure of the blown air and make it a laminar flow, resulting in uneven pressure and laminar flow. The swirling air causes a deflection phenomenon that makes the thickness of the film non-uniform, or wrinkles appear on the film surface, leading to the production of defective products.

Therefore, the applicant of the present application devised a system in which radial ribs were provided in the air path of the nearing as published in Utility Model Publication No. 55-28486, and by passing air between the radial ribs, the generation of vortex air was prevented. Although we succeeded in preventing this problem, even with this method, the amount of air passing through between the ribs near the air inlet of the main body is larger than in other parts, causing unevenness in the air blown out from the nozzle opening, causing deflection. It still has the following drawbacks.

This invention was made to eliminate the drawbacks mentioned above.
Hereinafter, explanation will be given based on embodiment figures.

The main body 4 has an air inlet 1 on the outer periphery and a ventilation notch 3 on the inner periphery of the upper piece 2, and has a U-shaped cross section facing inward. An outer guide tube 7 having an inverted cross-section, which has a collar piece 5 with air holes 6 perforated therein, is installed horizontally on the outer circumference of the upper end, and a horizontal piece 18 is attached on the inner circumference of the lower end. The lower end of 7 and the lower end of the chain stitch 8 provided on the lower circumferential side of the collar piece 5 are supported on the stepped portion 10 provided on the inner periphery of the lower piece 9 of the main body 4 and on the outer periphery of the upper piece 2. As a result, a gap 11 is formed between the upper piece 2 of the main body 4 and the flange piece 5 of the outer guide tube 7.

A ring wire 12 provided on the circumferential side of the collar piece 5 in the outer guide tube 7
A ring wire 13 of an inner guide tube 15 having a diameter smaller than that of the outer guide tube 7 having a collar piece 13 integrally and horizontally connected to the outer periphery of the upper end and a screw groove 14 cut on the lower end side and having an inverted letter-shaped cross section. The circumferential probe is fixed with the inner guide tube 15 loosely inserted into the outer guide tube 7, and between the collar piece 5 of the outer guide tube (7) and the collar piece 13 of the inner guide tube 15, and between the outer guide tube 15 and the outer guide tube 7. 7 inner circumference and inner guide tube 15
A horizontal slit 16 and a vertical slit 17 are formed between the outer periphery of the slit and the outer periphery.

A lower annular current plate 20 having an annular protrusion 19 extending obliquely upward is connected to the tip of the horizontal piece 18 on the inner periphery of the lower end of the outer guide cylinder 7, and a screw groove 14 on the inner periphery of the lower end of the inner guide cylinder 15 is connected , an annular protrusion 1 on the inner periphery of the lower annular current plate 20
Upper annular current plate 2 having an annular protrusion 21 with a larger diameter than 9
2, a screw groove 23 on the outer periphery, a slit 24 between the lower annular current plate 20, and an annular protrusion 1 on the inner periphery of the lower annular current plate 20.
9 and the annular protrusion 21 on the inner circumferential portion of the upper annular current plate 22 so as to form a nozzle opening 25, respectively.

A large number of partition walls 26 are provided radially on the inner periphery of the outer guide tube 7 to cut the vertical slot 17 into pieces, and the partition walls 2 are arranged adjacent to each other.
6. A cover piece 27 is provided between the upper ends of 26, and a chain stitch 12 on the outer periphery of the collar piece 5 of the outer guide tube 7 is attached to the cover piece 27.
By fixing the inner end of the thin shaft 28 that passed through the partition walls 26 and 26 and moving the thin shaft 28 laterally, the lid piece 2 is inserted between the upper ends of the partition walls 26 and 26.
7 can be opened and closed.

29 is a rotating handle provided on the upper annular current plate 22.

In the present invention configured as described above, the air inlet 1 in the outer circumferential portion of the main body 4 is opened at a plurality of locations in the connection direction, and the near ring of the above configuration has an annular discharge port 30 having a smaller diameter than the nozzle port 25. It is supported on a blow molding die 31 on the upper surface.

The synthetic resin film tube 32 in a semi-molten state is drawn out from the annular discharge port 30 on the upper surface of the die 31. At this time, if cooling air is supplied into the main body 4 from the air inlet 1, This air passes through the notch 3 in the upper piece 2 of the main body 4, enters the cavity 11, and then passes through the ventilation hole 6 in the collar piece 5 of the outer guide tube 7, and passes through the both guide tubes 7, 1.
The air that entered the horizontal gap 16 between the collar pieces 5 and 13 of No.
It is shredded when passing between the partition walls 26 in the vertical narrow part 17 between the holes 15 and 15.

Therefore, the airflow is changed into a laminar flow directed in a fixed direction,
The air is blown from the vertical gap 17 through the gap 24 between the upper and lower annular current plates 22.20, and from the nozzle port 25 between the annular protrusions 19.21 on the inner periphery of the upper and lower annular current plates 22.20,
Discharged from the annular discharge port 30 on the upper surface of the rice 31,
Semi-molten synthetic resin film cylinder 32 being pulled upwards
Cool the outer periphery of the

However, if the cooling air pressure blown out from the nozzle port 25 is uneven, the surface of the semi-molten synthetic resin film cylinder 32 to be cooled may be deflected or wrinkled. Bulkhead 26.2 in the closest position
When the degree of opening of the lid piece 27 located between the upper ends of the cover 27 is adjusted by moving the thin shaft 28 in the axial direction, the cooling air blown out from the nozzle opening 25 becomes a uniform laminar flow.

Therefore, the semi-molten synthetic resin film cylinder 32 is cooled to a uniform thickness, and a high-quality product can be obtained without wrinkles.

In the above embodiment, the thin shaft 28 for operating the lid piece 27 is passed through the ring wire 12 of the collar piece 5, but as shown in FIG. It goes without saying that the flange piece 13 of the inner guide tube 15 may be penetrated therethrough.

[Brief explanation of drawings]

The drawing shows an embodiment of the air volume adjusting device in the near ring for synthetic resin film blow molding according to the present invention.
FIG. 1 is a longitudinal sectional front view, FIG. 2 is a sectional view taken along the line A--A in FIG. 1, and FIG. 3 is a longitudinal sectional front view showing another embodiment. 1...Air inlet, 2...Top piece, 3...
... Notch, 4 ... Main body, 5 ... Flange piece, 6 ... Ventilation hole, 7 ... Outer guide tube,
8... Ring line, 9... Lower piece, 10...
...Stepped part, 11...Gap part, 12...
- Ring wire, 13... Flange piece, 14... Spiral groove, 15... Inner guide tube, 16... Horizontal slot, 17... ...Vertical crevice, 18...
・Horizontal piece, 19... Annular projection, 20...
・Lower annular current plate, 21... annular protrusion, 22.
... Upper annular current plate, 23 ... Threaded groove, 2
4... Slit, 25... Nozzle opening, 26
・・・・・・Partition wall, 27... Lid piece, 28...
... Thin shaft, 29 ... Rotating handle, 30.
...Annular discharge port, 31...Dice, 32
...Synthetic resin film cylinder.

Claims (1)

[Claims for Utility Model Registration] An annular main body with an inward U-shaped cross section and an air inlet on the outer periphery and a ventilation notch on the inner periphery of the top piece; It is equipped with a collar piece having a large number of ventilation holes on the outer periphery of the upper end, and a horizontal piece on the inner periphery of the lower end,
an outer guide tube fixed to the inner circumference of the lower piece of the main body and the outer circumference of the upper piece to form a gap between the upper piece of the main body and the flange; and an outer guide tube that is loosely inserted into the outer guide tube. The collar piece of the inner guide tube, which has a collar piece on the outer periphery of the upper end and a threaded groove cut on the inner periphery of the lower end, is fixed on the outer part of the collar piece of the outer guide tube, and the inner and outer guide tubes are connected between the two collar pieces. an inner guide tube that forms a horizontal gap and a vertical gap between the inner guide tube; An upper annular current plate whose outer periphery is screwed into a threaded groove on the inner periphery of the lower end of the cylinder forms a slit that communicates with the vertical slit between the inner and outer guide cylinders, and a gap is formed on the inner periphery of the annular current plate. In a near ring for synthetic resin film blow molding that is equipped with a nozzle opening formed between protruding annular protrusions, a large number of partition walls are provided radially on the inner periphery of the outer guide cylinder to cut vertical gaps into small pieces, and Lid pieces for opening and closing between the upper ends of the partition walls are respectively provided between the upper end surfaces of adjacent partition walls, and each of the lid pieces is provided with an inner end of a thin shaft that operably penetrates the outer wall of the horizontal slot. An air volume adjusting device for a near ring for molding a synthetic resin film, characterized in that the upper end surfaces of connected partition walls adjacent to each other can be opened and closed by lid pieces.