JPH05228993A - Airing device - Google Patents

Abstract

PURPOSE:To mold at a high speed and stably by providing an air port oriented horizontally with respect to the central line of a device and an air port oriented within a specific angle range as an airing air port for the use of inflation molding. CONSTITUTION:An upper lip 10, a middle lip 11, and a lower lip 12, are attached to an airing main body 13. A cooling air 4 coming in from a cooling air inlet 1 becomes nearly uniform speed in the annular direction at a partition plate 2 and is distributed to blowoff ports 7 and 8 at the middle lip 11. For the angle of the port 8, an angle alpha of 0 deg. through 90 deg. both inclusive with respect to the central line A is necessary. On the other hand, the port 7 is oriented to the rectangular direction with respect to the central line A, that is, an angle gammais made to be within 0+ or -10 deg.. A melted resin receives the cooling air 4 nearly from the vertical direction and is cooled rapidly, so that stability of a valve will be improved. Also, as the cooling air 4 is blown off from the 2 parts, the heated air touches the valve surface a little, so that larger cooling effect can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device in a tubular resin manufacturing apparatus. More specifically, the present invention provides an air ring device for efficiently cooling the resin extruded from the die when producing a tubular film of a thermoplastic resin at a high speed by extrusion molding, for example, an inflation molding method.

[0002]

2. Description of the Related Art FIG. 6 is an explanatory view showing a conventional air ring device mechanism and its operation. In FIG. 6, the cooling air enters the air ring device from the cooling air inlet 1 and is rectified by the partition plate 2 in the annular direction to the annular direction from the annular outlet 3 toward the center line (A) of the air ring device. On the other hand, the cooling air 4 is blown out substantially uniformly.

On the other hand, Japanese Examined Patent Publication (Kokoku) No. 1-54182 discloses an air ring device which does not have a partition plate but has two outlets.

[0004]

According to the conventional method as shown in FIG. 6, in order to increase the production speed of the film by inflation molding, the cooling speed blown from the air ring device is increased to increase the cooling effect. It is necessary to let them do it. However, since the cooling air is blown from one place at an extremely high wind speed, extreme deformation of the molten resin occurs at a part 5 of the bubble, which deteriorates the stability of the bubble 6 and makes it difficult to manufacture the film at high speed. Was causing the Even in the method disclosed in Japanese Patent Publication No. 1-54182, when a film is produced at a high speed, the stability of bubbles may deteriorate depending on the speed.

[0005]

The air ring device according to the present invention is intended to solve the above-mentioned problems, and one of the air outlets 7 provided at two locations is the center of the device. Directed perpendicular to the line (A), the other outlet 8
Are oriented at an angle of 0 ° or more and 90 ° or less with respect to the same center line (A).

[0006]

In the conventional method, the cooling air 9 heated by the heat exchange with the molten resin advances on the surface of the bubble 6 indefinitely, so that the heat exchange rate gradually deteriorates and the required cooling effect cannot be obtained. Therefore, in order to improve the cooling effect, a strong wind has to be blown to the bubble 6, and a part of the bubble 5 is deformed and becomes unstable, which makes it difficult to obtain a normal product.

On the other hand, since the air ring device of the present invention has a structure in which the cooling air 4 is blown out from the two outlets as shown in FIG. 1, the cooling air travels toward different places.
Therefore, the contact of the heated air on the surface of the bubble 6 is small, a larger cooling effect is obtained, and the bubble 6 is stable and a normal product can be obtained even when the film is produced at high speed. Therefore, some of the bubbles are not deformed as seen in the conventional method, and the stability of the bubbles 6 is very good even when a film is produced at high speed.

In the present invention, since the one outlet 7 has a structure in which the cooling air is blown toward the molten resin in a substantially vertical direction, the molten resin is rapidly cooled at that portion and the resin viscosity in the molten state is lowered. The stability of the bubble 6 is improved. Moreover, it becomes possible to further increase the wind speed of the cooling air blown out from the other outlet 8, and it is possible to dramatically improve the cooling effect.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a partially cutaway front view of an air ring device showing an example of the present invention, and FIG. 2 is a plan view. In FIG. 1, the cooling air 4 entering the air ring device from the cooling air inlet 1
Is subjected to rectification by the partition plate 2 and has a substantially uniform wind speed in the annular direction. This mechanism is similar to the conventional product. Further, the cooling air is blown out from the air outlet 7 and the air outlet 8 through the lip portion of the air ring device.

The air ring upper lip 10, the air ring middle lip 11, and the air ring lower lip 12 are the air ring body 1.
3 are attached respectively. The cooling air sent from the air ring body 13 is partitioned by the air ring inner lip 11 and distributed to the air outlets 7 and 8. The air ring upper lip 10 can be moved up and down, and by moving it up and down, the air outlet area of the air outlet 8 is changed to adjust the wind speed of this portion.

The angle of the outlet 8 is required to be 0 ° or more and 90 ° or less with respect to the center line (A). More preferably, it is set to 30 ° or more and 90 ° or less. More preferably, it may be better if it is set to 35 ° or more and 65 ° or less. More specifically, it is necessary to set the wall angle of the lip 11 in the air ring on the outlet 8 side to 0 ° or more and 90 ° or less. More preferably 30 ° or more 9
It is preferable that the angle is 0 ° or less. A more preferable angle is 35 ° or more and 65 ° or less. The angle of the other wall of the air outlet 8, that is, the angle of the air outlet 8 of the upper lip 10 of the air ring is + 15 ° with respect to the angle of the air outlet 8 of the middle lip 11 of the air ring.
It is preferably set within the range of -15 ° or less.
More preferably, it is more preferably set within the range of + 10 ° or more and −10 ° or less.

A rectifying plate may be provided in the passage of the air outlet 8.
FIG. 3 is a plan view of a portion of the middle lip 11 showing an example in which the current plate 14 is attached on the tangent line of the bubble 5. The rectifying plate 14 can blow the cooling air toward the tangential direction side of the bubble 5. By providing the straightening vane 14, it becomes possible to reduce the deformation of the bubbles and blow the cooling air from the air ring device at a higher wind speed. As a result, the cooling effect can be further increased. The current plate 14 may be attached to either the upper lip 10 of the air ring or the middle lip 11 of the air ring. Next, another example of the mounting position of the current plate 14 will be described with reference to the drawings. 4 and 5 show the middle lip 1
FIG. 3 is an enlarged plan view of the vicinity of the air outlet 8 of No. 1 and only one rectifying plate is shown for the sake of explanation. In either case, the current plate 14 is installed so as to blow the cooling air toward the tangential direction side of the bubble 5.

In FIG. 4, the rectifying plate 14 has a length within 1/2 of the inner diameter 20 of the air ring middle lip 11 from the tangential direction 15 of the bubble 5, preferably 1 / l of the inner diameter 20 of the air ring middle lip 11. It is installed on the line 18 or 19 which is translated by a length of 4 or less. Further, as shown in FIG. 5, the current plate 14 may be installed on a straight line having an angle β of −35 ° or more and + 45 ° or less with respect to the tangential direction 15 of the bubble 5. It may be more preferable to set the angle β in the range of −30 ° or more and + 30 ° or less, particularly in the range of the angle β of −20 ° or more and + 20 ° or less.

In some cases, it is preferable that the length of the straightening vane 14 is 1/2 or more of the length 21 of the air outlet in order to have a straightening effect. Further, the number of the rectifying plates 14 is preferably four or more. On the other hand, the air outlet 7 must be oriented in a direction perpendicular to the center line (A). In the present invention, the vertical direction means that the value of γ in FIG. 1 is 0 ° ± 10 °, preferably 0.
Says ± 5 °. More specifically, the air outlet 7 portion of the air ring middle lip 11 and the air ring lower lip 12 will be described.
It is necessary that the angle of each of the air outlets 7 with respect to the central axis (A) is 0 ° ± 10 °, preferably 0 ° ± 5 °. Further, the flow straightening plate as described above may be attached near the air outlet 7. When the straightening vane is attached, it is preferable to attach it in the same manner as when it is attached to the air outlet 8.

Further, straightening vanes 14 may be attached to both the air outlet 7 and the air outlet 8. Most or part of the material of the air ring device of the present invention may be aluminum or aluminum alloy instead of conventional ones. Lightweight and easy to remove and replace when replacing,
Workability is greatly improved.

[0016]

When inflation molding is performed using the air ring device of the present invention, stable molding can be performed at high speed.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing an example of the present invention.

FIG. 2 is a plan view showing an example of the present invention.

FIG. 3 is a plan view showing an example of a middle lip portion of the present invention.

FIG. 4 is an enlarged plan view in the vicinity of a blowout port of a middle lip, for explaining an example of a mounting position of a current plate.

FIG. 5 is an enlarged plan view of the vicinity of the blowout port of the middle lip for explaining another example of the mounting position of the current plate.

FIG. 6 is an explanatory view explaining a conventional air ring device mechanism and its operation.

[Explanation of symbols]

1 Cooling air inlet 2 Partition plate 3 Conventional air ring device outlet 4 Cooling air 5 Part of bubble 6 Bubble 7 Air ring device outlet oriented perpendicular to the bubble 8 Blow of the other air ring device Outlet 9 Cooling air that has undergone heat exchange 10 Air ring upper lip 11 Air ring middle lip 12 Air ring lower lip 13 Air ring body 14 Rectifier plate 15 Bubble tangential direction 16 Cooling air inlet to air outlet 7 17 Air ring Part of middle lip 22 Die 23 Guide plate 24 Pinch roll 25 Air ring Upper lip adjustment handle

Claims (1)

[Claims] 1. One of the two air outlets provided at two locations is oriented perpendicular to the centerline (A) of the device, and the other outlet 8 is directed to the same centerline (A). An air ring device which is oriented at an angle of 0 ° or more and 90 ° or less.