JP2022037840A - Thickness deviation adjustment type air ring - Google Patents

Abstract

To provide a thickness deviation adjustment type air ring that can optimally adjust an airflow of cooling air partially in a circumferential direction over an entire circumference of an inflation film manufacturing equipment without disturbing a flow of cooling air, and can adjust an opening degree of an air outlet without rotating a member constituting the air outlet, thereby enabling a molding of a synthetic resin film with excellent thickness uniformity.SOLUTION: A composite ring consisting of an elastic film ring, a connecting member and an intermediate member is connected to a plurality of moving means. A portion of a wall surface of a cooling air flow channel is composed of an annular elastic membrane with no steps and a radial inclination angle of 75 degrees or less at maximum adjustment. The annular elastic membrane is deformed axially over its entire circumference with the composite ring to partially adjust a spacing of the cooling air flow channel about a circumferential direction, and a blowout member with means to prevent rotation is screwed to an annular nut to allow the blowout member to move axially without rotation by turning the annular nut.SELECTED DRAWING: Figure 1

Description

Detailed description of the invention

INDUSTRIAL APPLICABILITY The present invention is installed on a die of an inflation film manufacturing apparatus for molding a synthetic resin film, and when a cooling air is blown around an extruded molten synthetic resin tube to cool and solidify the synthetic resin film. The present invention relates to an uneven thickness adjustment type air ring that adjusts the uneven thickness (thickness variation) of a synthetic resin film by partially adjusting the air volume of the cooling air in the circumferential direction.

In the inflation film manufacturing equipment, when the synthetic resin tube in the molten state extruded from the die is cooled and solidified by the uneven thickness adjustment type air ring to form the synthetic resin film, the cooling air is adjusted to match the synthetic resin tube to be molded. It has already been conventionally performed to adjust the uneven thickness of the synthetic resin film by the uneven thickness adjusting type air ring that adjusts the opening degree of the outlet and partially adjusts the air volume of the cooling air in the circumferential direction. ..

An example of this type of uneven thickness adjusting type air ring is described in, for example, "Patent Document 1". A part of the outer wall (wall surface) of the disk-shaped flow path (cooling air flow path) is made of an annular elastic material (annular elastic membrane), and a plurality of bolts (moving means) as a means of transportation are arranged in a circumferential shape. An example is shown in which the annular elastic material is deformed by the bolt to adjust the expansion / contraction of the flow path.

Further, an opening portion is formed by providing a lower lip facing the upper lip (ring-shaped member) fixed to the upper lip mounting hardware (ring-shaped member) screwed to the cooling ring (main body) to form the upper lip mounting hardware. An example is shown in which the lip interval (opening of the outlet) is adjusted (adjusted) by adjusting the amount of screwing into the cooling ring.

In addition, there is a description in "Patent Document 2". In "FIG. 2" of the first embodiment of the publication, an annular elastic member is provided in the flow path of the cooling air, and the annular elastic member is provided by a plurality of moving portions (moving means) arranged in the circumferential direction. Is shown in an example in which the space of the flow path of the cooling air is partially adjusted in the circumferential direction by moving the synthetic resin tube in the longitudinal direction (axial direction).

Jikkensho 58-028823 Gazette JP-A-2017-104983

However, in the uneven thickness adjusting type air ring of the example of "Patent Document 1", the annular elastic material is firmly fixed by the presser plate on the 5th to 7th lines from the top of the 4th stage of the publication. Therefore, there is no such concern and only local deformation occurs. ”As shown in FIG. 7, when adjusting the bolt, the annular portion of the bolt (30) supported by the spherical pusher (29) is annular. The elastic material (22) is deformed according to the adjustment position of the bolt, but the annular elastic material in the intermediate portion without the support of the spherical pusher is not deformed, or even if it is small.

Therefore, since the annular elastic material in the intermediate portion without the support of the spherical pusher cannot be adjusted as required according to the uneven thickness of the synthetic resin film, there are some places where the required uneven thickness cannot be partially adjusted in the circumferential direction. There was a problem of doing.

Further, in the uneven thickness adjustment type air ring, the uneven thickness adjustment is often automated by interlocking with a thickness gauge or the like. In this case, it is necessary to change the means of transportation to an air cylinder, a motor, or the like instead of a manual bolt, and connect the moving means to an external device or the like with a hose, wiring, or the like. When rotating the upper lip mounting hardware at the threaded part to adjust the lip spacing, it is necessary to remove the hose, wiring, etc. connected to external equipment etc. from the transportation means, which is a very troublesome work. There was a problem.

In the example of "Patent Document 2", in the uneven thickness adjusting type air ring that moves the annular elastic member in the longitudinal direction, the outer diameter portion and the inner diameter portion of the annular elastic member at the moving portion are the wall surface of the cooling air flow path. The cooling air that protrudes vertically from the surface and flows in the radial direction creates a turbulent flow before and after the annular elastic member, resulting in a turbulent flow, and the required adjustment of the cooling air volume in the circumferential direction is possible. There was a problem that it could not be done.

Therefore, in view of the above problem of the uneven thickness adjusting type air ring, the present invention partially adjusts the air volume of the cooling air in the circumferential direction without causing turbulence or the like in the cooling air. It is an object of the present invention to provide an uneven thickness adjusting type air ring capable of stably forming a synthetic resin film having excellent uneven thickness.

Further, it is an object of the present invention to provide an uneven thickness adjusting type air ring capable of adjusting the opening degree of the outlet by moving the member constituting the outlet of the cooling air in the axial direction without rotating.

The first uneven thickness adjusting type air ring of the present invention, which solves the above-mentioned problems, is installed on a die of an inflation film manufacturing apparatus and is cooled by blowing cooling air around a synthetic resin tube in a molten state extruded in the axial direction. When the synthetic resin film is formed by solidification, the opening degree of the cooling air outlet is adjusted, and a plurality of annular elastic films forming a part of the wall surface of the cooling air flow path are arranged in the circumferential direction. The synthetic resin film is formed by deforming it in the axial direction by a moving means provided to partially adjust the distance between the flow paths in the circumferential direction and partially adjusting the air volume of the cooling air in the circumferential direction. In the uneven thickness adjusting type air ring for adjusting the uneven thickness, a composite ring is formed by integrating a plurality of connecting members and intermediate members alternately with a flat surface portion of an elastic film ring in a state of arranging them in a circumferential shape. The composite ring is arranged in contact with the elastic film, and the annular elastic film is partially deformed in the circumferential direction via the composite ring connected to the moving means by the connecting member portion to form the flow. It is characterized in that the distance between the paths is partially adjusted in the circumferential direction so that the air volume of the cooling air is partially adjusted in the circumferential direction.

The second uneven thickness adjusting type air ring of the present invention is the first uneven thickness adjusting type air ring of the present invention, wherein the annular elastic film is attached without a step with the wall surface of the flow path. It is a feature.

The third uneven thickness adjusting type air ring of the present invention is the radial slope of the annular elastic film when the moving means is moved to the maximum in the first uneven thickness adjusting type air ring of the present invention. It is characterized in that the angle formed by the wall surface of the flow path is 75 degrees or less.

The fourth uneven thickness adjusting type air ring of the present invention is the above-mentioned first uneven thickness adjusting type air ring of the present invention, the rotatable annular nut and the annular nut that are loosely fitted to the annular block on the main body. The ring-shaped member is provided with a ring-shaped member to be screwed, and a detenting means guided by a long groove formed in the axial direction of the main body is provided on the ring-shaped member, and the ring-shaped member is rotated by rotating the annular nut. It is characterized in that it moves in the axial direction without doing anything.

In the first to third uneven thickness adjusting type air rings of the present invention, the cooling air flowing in the annular elastic film portion in the radial direction does not cause turbulence or the like, and the air volume of the cooling air is measured in the circumferential direction over the entire circumference. The required adjustment can be partially made, and a synthetic resin film having excellent uneven thickness can be stably formed.

Further, the fourth uneven thickness adjusting type air ring of the present invention can move the member constituting the cooling air outlet in the axial direction without rotating, and the hose such as an air cylinder or a motor of the moving means can be moved. The opening of the outlet can be adjusted without the troublesome work of removing the wiring and wiring.

It is a radial sectional view of the uneven thickness adjustment type air ring which shows the 1st Embodiment of this invention. Similarly, it is a cross-sectional view taken along the line AA of FIG. Similarly, it is an enlarged view of part B of FIG. Similarly, it is a CC development sectional view of FIG. It is a D part enlarged view of FIG. 1 which shows the 2nd Embodiment of this invention. Similarly, it is an enlarged view of part E of FIG. It is a drawing of the adjustment part of the conventional uneven thickness adjustment type air ring.

Hereinafter, embodiments of the uneven thickness adjusting type air ring according to the present invention will be described in detail with reference to the drawings.

1 to 4 show the first embodiment of the present invention, and as shown in FIG. 1, in the inflation film manufacturing apparatus, the uneven thickness adjusting type air ring 3 is concentric with the die 1 on the die 1. It is fixed by appropriate means. The molten synthetic resin tube 2 extruded from the die 1 and filled with air of a predetermined pressure is blown out from the outlet 10 whose opening degree is adjusted while being thinly stretched in both the axial direction F and the circumferential direction. It is cooled by the cooling air 6 and taken up as a solidified synthetic resin film by a pinch roll (not shown).

As shown in FIGS. 1 and 2, in the uneven thickness adjusting type air ring 3, a pool chamber 29 for cooling air 6 is defined by a straightening vane 26 in the vicinity of the outer periphery of the annular main body 4, and the pool chamber 29 is formed in the pool chamber 29. A plurality of hose openings 5 are formed at equal intervals in the circumferential direction. The flow path 8 of the cooling air 6 formed by the main body 4 and the concentric ring-shaped member 7 and the annular outlet 10 at the inner peripheral portion are connected to the pool chamber 29.

As shown in FIG. 3, the first annular groove 9a, the second annular groove 9b, and the third annular groove 9c are concentrically formed in the ring-shaped member 7. Further, a fourth annular groove 9d and a fifth annular groove 9e dug to the same depth as the thickness of the annular elastic film 11 are formed in the ring-shaped member 7. Using the first pressing ring 12 and the second pressing ring 13, the annular elastic film 11 forming a part of the wall surface of the ring-shaped member 7 is attached to the wall surface of the ring-shaped member 7 in a flat state without a step.

As shown in FIGS. 2 and 4, a plurality of connecting members 15 and intermediate members 16 arranged alternately in a circumferential shape with a predetermined gap are integrated with the flat surface portion of the elastic membrane ring 14 by an adhesive or the like. In the state, the annular composite ring 17 is configured. The composite ring 17 is provided in a state of being in contact with the side surface of the annular elastic film 11 opposite to the flow path 8 of the cooling air 6 and supporting the annular elastic film 11.

As shown in FIGS. 3 and 4, a plurality of air cylinders 18 as transportation means are provided in a circumferential shape on the ring-shaped member 7, and a coil spring is provided on the rod portion of the air cylinder 18 so as to face the movement of the rod. 19 is attached, and a connecting member 15 constituting the composite ring 17 is further connected to the rod portion. Therefore, the annular elastic membrane 11 is supported by the air cylinder 18 via the composite ring 17.

As shown in FIG. 3, when the air cylinder 18 moves to the maximum, the radial angle G on the outer diameter side and the inner diameter side formed by the slope of the annular elastic film 11 and the wall surface of the ring-shaped member 7 is 75 degrees. It has the following structure.

In such an uneven thickness adjusting type air ring 3, the cooling air 6 supplied from a blower (not shown) to the hose port 5 is rectified by the reservoir 29, the rectifying plate 26, etc., and becomes a radial flow toward the center. A synthetic resin film is formed by cooling and solidifying the synthetic resin tube 2 in a molten state by blowing out from the outlet 10 whose opening degree is adjusted through 8.

Here, the solidified portion of the molten synthetic resin tube 2 is not stretched and is not further thinned, but the unsolidified portion of the molten synthetic resin tube 2 is stretched in the circumferential direction and becomes thin until it is solidified. ..

Therefore, when the pressure of the compressed air supplied to the air cylinder 18 corresponding to the thick portion of the synthetic resin tube 2 in the molten state is increased, the thrust of the compressed air in the air cylinder 18 and the compressive force of the coil spring 19 are balanced. The rod moves to the position.

At this time, the distance L between the connecting members 15 connected to the adjacent air cylinders 18 is a distance L corresponding to the difference in the amount of movement of the air cylinders 18, and is not constant, but is intermediate with the connecting members 15 constituting the composite ring 17. The elastic film ring 14 in the gap between the member 16 expands and contracts and bends to allow independent required movement of each air cylinder 18, and the composite ring 17 is axially following the movement amount of each air cylinder 18. Make a transformation.

Similar to the composite ring 17, the annular elastic film 11 supported by the composite ring 17 is deformed in the axial direction according to the movement amount of each air cylinder 18 at all points in the circumferential direction. That is, the annular elastic film 11 in the portion between the adjacent connecting members 15 is supported by the intermediate member 16 of the composite ring 17, and the annular elastic film 11 in the other portion is supported by the connecting member 15 in the composite ring 17. Therefore, the annular elastic film 11 is deformed in the axial direction according to the movement amount of each air cylinder 18 at all points in the circumferential direction.

The amount of cooling air 6 flowing through the portion of the cooling air flow path 8 whose spacing is narrowed in the circumferential direction is reduced, the solidification of that portion of the molten synthetic resin tube 2 is delayed, and the synthetic resin tube of that portion is slowed down. 2 becomes thinner, and the uneven thickness of the synthetic resin film to be molded is adjusted.

In this way, the composite ring 17 can reliably deform the annular elastic film 11 that supports it at all points in the circumferential direction over the entire circumference, and the annular elastic film 11 and the wall surface of the ring-shaped member 7 can be deformed. Further, when the air cylinder 18 moves to the maximum, the radial angle G formed by the slope of the annular elastic membrane 11 and the wall surface of the ring-shaped member 7 becomes 75 degrees or less. Therefore, the amount of the cooling air 6 can be partially and reliably adjusted in the circumferential direction over the entire circumference without generating a swirl flow or a turbulent flow.

Since the annular elastic film 11 is too hard to be deformed, rubber having a hardness of 70 ° (JIS-A) or less and a thickness of 1 mm or less is desirable.
Further, since the elastic film ring 14 needs flexibility as a composite ring 17 and necessary strength to support the annular elastic film 11, rubber having a hardness of 80 ° or less and a thickness of 2 mm or less is desirable.

According to the present embodiment, the annular elastic film 11 can be surely deformed in the required axial direction according to the uneven thickness of the synthetic resin film at all the locations in the circumferential direction over the entire circumference, and the spiral flow or the like can be obtained. The air volume of the cooling air 6 can be reliably adjusted in the circumferential direction without causing turbulence or the like, and the uneven thickness can be accurately adjusted to obtain a synthetic resin film having excellent uneven thickness.

5 and 6 show the second embodiment, and as shown in FIG. 5, the annular nut 23 is loosely fitted in the annular block 22 arranged on the main body 4 in a rotatable state. A handle 27 is attached to the annular nut 23, and the annular nut 23 and the ring-shaped member 7 are screwed together at a thread 31 portion. A pin 25 as a detent means that can freely move in the long groove 24 formed in the axial direction of the main body 4 is attached to the ring-shaped member 7.

As shown in FIG. 6, a plurality of axially elongated holes 30 are formed in the annular block 22 and the main body 4, and a plurality of through holes 28 are formed in the ring-shaped member 7. A hose 20 connecting the relay box 21 attached to the main body and the air cylinder 18 is inserted through the elongated hole 30 and the through hole 28.

With such a configuration, when the handle 27 is operated to rotate the circular nut 23, the ring-shaped member 7 whose pin 25 is guided to the long groove 24 moves in the axial direction without rotating, and the ring-shaped member 7 The outlet 10 formed in the inner peripheral portion of the above can be adjusted to a required opening degree. At that time, since the hose 20 moves in the through hole 28 and the elongated hole 30 in the axial direction, it does not hinder the operation of the annular nut 23 by the handle 27 and the axial movement of the ring-shaped member 7.

According to the present embodiment, since the opening degree of the outlet 9 can be adjusted without rotating the ring-shaped member 7, the hose 20 connected to the air cylinder 18 is removed when the opening degree of the outlet 9 is adjusted. There is no need for troublesome work.

Although the embodiments of the present invention have been described above, the embodiments described above do not limit the invention according to the claims. It should also be noted that not all combinations of features described in the embodiments are essential to the means for solving the problems of the invention.

1 Die 2 Synthetic resin tube 3 Uneven thickness adjustment type air ring 4 Main body 5 Hose port 6 Cooling air 7 Ring-shaped member 8 Flow path 9a 1st annular groove 9b 2nd annular groove 9c 3rd annular groove 9d 4th annular groove 9e 5 Circular groove 10 Blowout port 11 Circular elastic film 12 1st holding ring 13 2nd holding ring 14 Elastic film ring 15 Connecting member 16 Intermediate member 17 Composite ring 18 Air cylinder 19 Coil spring 20 Hose 21 Relay box 22 Ring block 23 Ring nut 24 Long groove 25 Pin 26 Straightening plate 27 Handle 28 Through hole 29 Reservoir 30 Long hole 31 Thread F Axial direction G Tilt angle L Distance

Claims (4)

When a cooling air is blown around a molten synthetic resin tube that is installed on a die of an inflation film manufacturing apparatus and is extruded in the axial direction to cool and solidify the synthetic resin film, the cooling air outlet is used. The opening degree of the cooling air is adjusted, and the annular elastic films forming a part of the wall surface of the cooling air flow path are axially deformed by a plurality of moving means arranged in the circumferential direction to reduce the distance between the flow paths. In the uneven thickness adjustment type air ring that adjusts the uneven thickness of the synthetic resin film by partially adjusting the circumferential direction and partially adjusting the air volume of the cooling air in the circumferential direction.
A composite ring is formed by integrating a plurality of connecting members and intermediate members with a flat surface portion of the elastic membrane ring in a state where the intermediate members are alternately arranged in a circumferential shape, and the composite ring is arranged in a state of being in contact with the annular elastic membrane. Then, the annular elastic membrane is partially deformed in the circumferential direction via the composite ring connected to the moving means by the connecting member portion, and the distance between the flow paths is partially adjusted in the circumferential direction. , An uneven thickness adjustment type air ring characterized in that the air volume of the cooling air is partially adjusted in the circumferential direction. In the uneven thickness adjusting type air ring according to claim 1,
An uneven thickness adjusting type air ring characterized in that the annular elastic film is attached without a step to the wall surface of the flow path. In the uneven thickness adjusting type air ring according to claim 1,
An uneven thickness adjusting type air ring characterized in that the angle formed between the radial slope of the annular elastic film and the wall surface of the flow path is 75 degrees or less when the moving means is moved to the maximum. In the uneven thickness adjusting type air ring according to claim 1,
The ring-shaped anti-rotation means is provided with a rotatable annular nut that is loosely fitted in the annular block on the main body and a ring-shaped member that is screwed into the annular nut, and is guided by a long groove formed in the axial direction of the main body. An uneven thickness adjusting type air ring provided on a member and having the ring-shaped member moved in the axial direction without rotating by rotating the annular nut.

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