JPS6237714Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention consists of a die having an annular molten resin discharge port in the center of its upper surface, and a high-sized air supply pipe with a stirring blade at the upper end on the inside and outside of the center, and a shaft between the air supply pipe and the shaft. A low-sized air supply pipe with matching core wires is installed vertically,
The inside of the semi-molten resin cylinder discharged from the discharge port is efficiently cooled by cooling air discharged from the air supply pipe and stirred by the stirring blade, and this cooling air is transferred to the exhaust pipe. This invention relates to an inner surface cooling device for a semi-molten resin cylinder in a synthetic resin film blow molding machine, in which the cylinder is discharged from the lower end.

Conventionally, in this kind of synthetic resin film blow molding machine, in order to cool the semi-molten synthetic resin cylinder discharged from the discharge port on the upper surface of the die, the upper surface of the inner peripheral portion of an air ring supported on the upper surface of the outer peripheral portion of the discharge port of the die has been used. Cooling air is blown out from a nozzle opened at the top of the cylinder, and this cooling air cools the outer surface of the semi-molten synthetic resin cylinder. It only supplies a small amount of air, and no cooling effect can be expected. Therefore, the cooling rate is low and the solidified synthetic resin cylinder
There was a problem in that the winding machine could not wind it up at a high speed.

The present invention was devised to eliminate the above-mentioned drawbacks, and will be described below based on embodiment figures.

The die 2 has an annular molten resin discharge port 1 in the center of the top surface of the die 2, and is equipped with a stirring blade 4, which can be horizontally rotated by a central shaft 5, at the center of the top surface of the die 2, above the opening 3 at the top end. An air supply pipe 6 is installed upright, and a low-sized exhaust pipe 8 having an opening 7 at the upper end is placed on the outside of the lower part of the air supply pipe 6, with the axis aligned with the air supply pipe 6 and with a slight gap therebetween. It is installed and fixed.

Reference numeral 9 denotes a shielding plate provided at the upper end of the central axis 5 of the stirring blade 4.

In the present invention having the above-described configuration, the molten resin is discharged from the discharge port 1, the molten resin is drawn upward in a cylindrical shape, and the synthetic resin cylinder 10 in a semi-molten state is expanded in diameter by internal air pressure. At the same time, the outer surface of the semi-molten synthetic resin cylinder 10 is cooled by cooling air blown from a nozzle on the upper surface of the inner circumference of an air ring (not shown) supported on the die 2, and the solidified synthetic resin film cylinder is cooled. The winding process using a take-up machine is the same as in the conventional method.

When the semi-molten synthetic resin cylinder 10 discharged from the discharge port 1 is drawn upward and at the same time cooling air is supplied into the air supply pipe 6, the cooling air flows through the opening 3 at the upper end of the air supply pipe 6 into the semi-molten synthetic resin. It is discharged into the film cylinder 10.

This is because the air supply pipe 6 is tall and the exhaust pipe 7 on the outside thereof is small. The discharged cooling air is discharged from the exhaust pipe 7 through a relatively long distance.

Since the stirring blade 4 is provided above the opening 3 of the air supply pipe 6, the stirring blade 4 horizontally rotates around the central axis 5 due to the pressure of the cooling air blown out from the opening 3. Then, the cooling air is sufficiently stirred and sprayed evenly onto the inner circumferential surface of the semi-molten synthetic resin film tube 10, thereby efficiently cooling the inner circumferential surface of the semi-molten synthetic resin film tube 10.

Therefore, the semi-molten synthetic resin film tube 10 is forcibly cooled by the cooling air from both the inside and outside surfaces, and the cooling rate is fast, and the solidified synthetic resin film tube is transported at high speed by the take-up machine. It becomes possible to wind it up.

The cooled air flows into the exhaust pipe 8 through the opening 7 at the upper end of the exhaust pipe 8 and is exhausted from the lower end.

1 and 2 show a case in which a shielding plate 9 is provided at the upper end of the central shaft 5 of the stirring blade 4, but as shown in FIG. Only the trailing blade 4' may be provided.

Furthermore, although FIG. 1 shows a center feed type in which the lower portions of the air supply pipe 6 and the exhaust pipe 8 are passed through the center of the die 2, as shown in FIG. A side feed type may also be used in which the lower part of the exhaust pipe 8' is buried in the die 2' and air is supplied and exhausted from the peripheral side of the die 2'.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view of the first embodiment of the present invention;
2 is a plan view of the shielding plate and stirring blade of FIG. 1, FIG. 3 is a longitudinal sectional front view of the second embodiment, and FIG. 4 is a longitudinal sectional front view of the third embodiment. 1... Discharge port, 2... Dice, 3... Opening,
4... Stirring blade, 5... Central shaft, 6... Air supply pipe, 7
...opening, 8...exhaust pipe, 9...shielding plate.

Claims (1)

[Scope of utility model registration request] At the center of the upper surface of the die having an annular molten resin discharge port in the center of the upper surface, a tall air supply pipe is provided with a horizontally rotatable stirring blade above the opening at the upper end, and the air supply pipe is A synthetic resin film blower characterized in that a low-sized exhaust pipe having an opening at the upper end is erected on the outside of the lower part of the cylinder, with its axis aligned with the air supply pipe and with a slight spacing between the air supply pipe and the air supply pipe. Internal cooling device for semi-molten resin cylinders in molding machines.