JPS6334906Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cooling device for inflation film molding.

One of the important things when forming a blown film is that a suitable amount of cooling air must be blown onto the blown film from a cooling device provided above the inflation die. Therefore, conventionally, as the above-mentioned cooling device, one having a ring body and an outer lip that is screwed into the threaded part of the upper plate through hole of the ring body and can move toward and away from the inner ear lip is used.
By appropriately rotating the outer air lip,
Although the air volume is adjusted, since there is inevitably a slight gap between the threaded part of the outer air lip and the upper plate through hole, the outer air lip becomes eccentric with respect to the inflation die, causing both the inner and outer air lips to There is a problem in that the width of the annular space between the two is not uniform, making it difficult to blow cooling air at an even pressure all around the inflation film.

Therefore, the present invention provides a cooling device for inflation film molding that solves these problems.

Hereinafter, one embodiment of the present invention will be described based on the drawings. 1 is an inflation die, and 2 is a cooling device disposed on the die 1, which is composed of the following components. That is, 3 is a ring body, which includes a bottom plate 3A that fits over the top of the die 1, a top plate 3B having a through hole 4 coaxial with the die 1 in the center, and a ring between the outer peripheral edges of both plates 3A and 3B. It consists of an annular outer peripheral plate 3C arranged therein. The inner circumferential edge 5 of the top plate 3B is thick and positioned below the outer circumferential edge thereof, and a female thread 6 is formed on the inner circumferential surface of the through hole 4. Reference numeral 7 denotes an outer lip, and a male threaded portion 8 on the outer circumferential surface of the outer peripheral rising portion 7A is screwed into the female threaded portion 6. Reference numeral 9 denotes an inner lip disposed from the inner circumferential portion of the bottom plate 3A to the die 1; 10 refers to a reference shaft whose lower end is screwed into a screw hole at a suitable position on the upper surface of the inner circumferential edge portion 5; and 11
is a reference roll that is rotatably fitted onto the reference shaft 10 and comes into contact with the outer peripheral surface of the upper end of the rising portion 7A of the outer ear lip 7;
When the outer air lip 7 is in contact with the outer air lip 7, the gap between the threaded portions 6 and 8 is made uniform over the entire circumference. 12 is a bearing, and 13 is a snap spring. Reference numeral 14 denotes a support shaft erected at two locations 120° apart from the reference roll 11 on the upper surface of the inner peripheral edge portion 5, and reference numeral 15 represents a bifurcated support shaft whose base end is rotatably supported by each support shaft 14. A swinging bracket, 16 a press roll rotatably fitted onto a pin 17 disposed at the tip of each bracket 15, 18 a protrusion protruding from the tip of each bracket 15, and 19 a bottom plate. The portion 19A is the inner peripheral edge portion 5
A receiving plate 20 is fixed to the upper surface and has a rising portion 19B located between each protrusion 18 and the outer lip 7; 18 is a threaded rod passing through the threaded rod 18; 21 is a nut screwed onto the tip of each threaded rod 20; 22 is a spring fitted onto each threaded rod 20 between each nut 21 and each vertical plate 18; , each presser roll 16 is connected to the rising portion 7A of the outer lip 7 via each bracket 15.
It is something that is forced on people. 23 is the outer air lip 7
24 is a cooling air inlet.

In the above configuration, if you want to adjust the amount of cooling air blown onto the inflation film 25, hold the handle 23 and rotate the outer lip 7 in one direction to adjust the distance α between the lips 7 and 9. Just adjust it. At this time, since the outer air lip 7 is always pressed against the reference roll 11 by both presser rolls 16, the gap between both threaded portions 6 and 8 becomes uniform over the entire circumference, and this outer air lip 7 1 and is always concentric.

In the above embodiment, one reference roll 11 and two presser rolls 16 are provided, but the present invention is not limited to this, and it is sufficient to have at least one reference roll 11 and one presser roll 16.

As described above, according to the cooling device for blown film forming of the present invention, a reference roll and a presser roll are provided, and the presser roll is pressed against the outer peripheral surface of the outer air lip to bring the outer air lip into contact with the reference roll. Since the spring is provided, the outer lip can always be made concentric with the inflation die based on the reference roll, even though there is a gap in the threaded portion. Therefore, the width of the annular space between the inner and outer air lips is equalized all around, which not only makes it possible to adjust the amount of cooling air blown onto the inflation film.
It is possible to blow cooling air with uniform wind pressure over the entire circumference of the blown film, and it is possible to obtain a high quality blown film.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a partially cutaway plan view, and FIG. 2 is a view taken along the - arrow in FIG. 1. DESCRIPTION OF SYMBOLS 1...Inflation die, 2...Cooling device, 3...Ring body, 3B...Top plate, 4...Through hole, 5...Inner peripheral edge, 6...Female thread part, 7...
Outer ear lip, 8...Male thread part, 9...Inner ear lip, 11...Reference roll, 14...Spindle, 15
...Bracket, 16...Press roll, 22...
...Spring, 25...Inflation film.

Claims (1)

[Scope of utility model registration request] In the inflation film cooling device, the above-mentioned outer air lip has a ring body and an outer air lip that is screwed into the threaded part of the upper plate through hole of the ring body and can move toward and away from the inner air lip, on the inflation die. A reference roll that can only rotate freely is provided in contact with the outer circumferential surface of the outer air lip at a suitable location, and an appropriate number of presser rolls that can freely approach and move away from the outer circumferential surface of the outer air lip are provided at appropriate locations at an appropriate distance from the reference roll. 1. A cooling device for inflation film molding, characterized in that a spring is provided for bringing the outer air lip into contact with the reference roll by pressing the roll against the outer peripheral surface of the outer air lip.