JPH0129068Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention <Field of industrial application> This invention relates to the production of thin tube strips or film strips by the inflation method, and in particular, this invention is applied to a water-cooled cooling device. This relates to a device that cools with a device that cools the device.

<Prior art> Conventionally, in this type of downward inflation molding machine, cooling water in the cooling tank overflows into the center hole of a donut-shaped cooling tank, and the overflowing center hole is filled with downward flow from the die. Introducing bubbles to be ejected into
The pressure inside the bubble is adjusted to expand the diameter of the bubble to almost the inner diameter of the center hole, and the water overflowing onto the surface of the bubble is brought into contact with a thin film and cooled.

Therefore, unless the liquid level in the water cooling tank is kept as calm as possible, the effect of the cooling water will be uneven, causing distortion and uneven thickness in the formed tube strip and film strip.

<Problem to be solved by the invention> However, since the top of the conventional donut-shaped water cooling tank is open, the water cooling tank is susceptible to airflow from the air conditioner, and particularly to the cooling air flowing down from the air cooling device installed near the die. There is a risk that the liquid surface may become rippled, causing a pause in the overflow state, or that the amount of overflow over the entire circumference becomes uneven.

This invention is intended to improve the drawbacks of such conventional devices.

B. Structure of the invention <Means for solving the problem> This invention makes cooling water in the cooling tank overflow into the center hole of a donut-shaped cooling tank, and bubbles are discharged downward from the die into the center hole in the overflowing water. In the water cooling tank where the cooling water is brought into contact with the outer circumferential surface of the bubble, a donut-shaped windshield plate is provided on the water surface of the donut-shaped cooling tank close to the water surface, and this windshield position is divided by a number of pieces. This is a water-cooled tank windshield device for a downward inflation molding machine, which is made of a combination of plates and is of a variable inner diameter type.

<Effect of the invention> In this invention constructed as described above,
The windshield plate is donut-shaped and has a variable inner diameter, so it covers almost the entire surface of the liquid in the cooling tank.Due to the thickness of the material that forms the bubble, if the diameter to reach the cooling tank is large, In accordance with this, the inner diameter of the donut-shaped windshield plate with a variable inner diameter is changed so that the bubble does not hit these windshield plates when passing through, and the wind does not reach the liquid level of the cooling tank.

<Example> This invention will now be described based on a representative example shown in the drawings.

In the figure, reference numeral 10 denotes a water-cooled cooling device, and the upper end 13 of the inner wall forming the center hole 12 of the donut-shaped cooling tank 11 is formed lower than the upper end of the outer wall 14 of the cooling tank 11. Cooling water is provided so that it overflows into the center hole 12 from all around the circumference on average.

In particular, in this invention, the water surface WL of the cooling water
A donut-shaped windshield plate 15 covering the entire water surface is provided at the upper end of the outer wall 14 slightly above the water surface.

As shown in FIGS. 2 and 3, this windshield plate 15 has a structure similar to that of a camera lens light aperture device, that is, a thin plate 16 having a shape as shown in FIG. Therefore, it is pivotally supported on a common ring-shaped support member 18, and the other end is pivotally connected to a common operating ring 19. A donut-shaped windshield plate 15a is formed by a large number of plates 16, and the circumference of the operating ring 19 is The inner diameter of the windshield plate 15a formed by a large number of plates 16 is variable by movement in the direction, and the size can be adjusted according to the diameter of the bubble B to be formed. .

C. Effects In this device constructed and operated as described above, since the windshield plate 15 is of a variable inner diameter type, the bubble B is introduced into the cooling tank 11.
By adjusting the inner diameter of the windshield plate 15 according to the outer diameter of the bubble B, the inner diameter of the windshield plate 15 can be adjusted to prevent the inner edge of the windshield plate from coming into contact with the bubble B, and also to prevent the wind from above from reaching the liquid level of the cooling tank 11. The liquid level will not ripple due to the wind blowing down, or the liquid level will not be uneven.

Furthermore, since the variable inner diameter donut-shaped windshield plate is located above the liquid level, the state of water overflowing from inside the cooling tank 11 is the same as in the conventional case.

<Effects Unique to the Embodiment> In addition to achieving the same effects as those of this invention described above, the movement of the actuating ring 19 in the circumferential direction causes a large number of plates 16 to operate at once, making it easy to close the windshield. The inner diameter of the plate 15a can be changed.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention, and FIG. 1 is a longitudinal sectional front view of this windshield device attached to an inflation molding machine, and FIG. 2 is a plan view of a variable-inner-diameter windshield plate. FIG. 3 is a partially omitted plan view of FIG. 2. Codes in the figure 10...Cooling device, 11...Cooling tank, 12...Center hole, 13...Top end of inner wall, 1
5a... Windshield plate.

Claims (1)

[Claim for Utility Model Registration] Cooling water in the cooling tank overflows into the center hole of a donut-shaped cooling tank, and a bubble discharged downward from a die is introduced into the overflowing center hole to allow the cooling water to flow. In the water cooling tank that is brought into contact with the outer peripheral surface of the bubble, a donut-shaped windshield plate is provided above the water surface of the donut-shaped cooling tank close to the water surface, and this windshield plate is a variable-inner-diameter type made of a combination of multiple plates. A water-cooled tank windshield device for a downward inflation molding machine, characterized by: