JPS6251419A - Method and device of cooling guiding thermoplastic synthetic resin film - Google Patents

Abstract

PURPOSE:To prevent cooling nonuniformity from developing in a film by a method wherein the air surrounding the film is sucked by air leading-in members in order to guide the film in the predetermined course under the state being apart from the air leading-in members while balancing the sucking force applied over the periphery of the film. CONSTITUTION:A pivoting means consists of a lower pivoting ring 13 and a lower supporting ring 16, which engages with the lower pivoting ring 13 relatively pivotably through roller bearings 19. Said lower pivoting ring 13, which is made into an integral body with an upper pivoting ring 8, can be pivoted about the center of a device by means of said pivoting means. At this time, the planary joining position of the upper pivoting ring 8, on which the upper ends of specified air leading-in members 12 are held through wringling means, and the planary joining position of the lower supporting ring 16, on which the lower ends of said air leading-in members are held, approach to or get apart from each other. As a result, the diameter of an envelope circle, which is formed at a constant horizontal position by the outer peripheries of a large number of the air leading-in members 12, is enlarged or diminished. A bubble, which vertically passes through the envelope circle by a certain gap between the bubble and the envelope circle, is removed heat therefrom and cooled and at the same time precisely guided into a certain diameter.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cooling guide method and device used when manufacturing films such as thermoplastic synthetic resins by the inflation method or the Tedai method, and in particular, relates to The film is continuously passed through a section formed by one or more air introduction members having suction ports, and the air around the film is sucked by the air introduction member to balance the suction force applied to the film. The present invention relates to a round technique in which the film is guided along a predetermined path while being separated from the air introduction member.

[Conventional technology]

Thermoplastic synthetic resins such as polyethylene and polypropylene (
It may also contain various fillers. ) In the production of flat films and bags by K, forming methods such as the inflation method and the Tedai method are adopted.

First, an outline of the inflation method will be explained with reference to FIG. 1. A thermoplastic synthetic resin pellet is charged from a hopper 1 to an extrusion molding machine 2, and is heated and melted and extruded in the extrusion molding machine 2, and is then heated to form a circular shape. It is passed through the mold die 3. Then, it is inflated with compressed air to become a cylindrical film, that is, a bubble 4. The outside of the bubble 4 is cooled by the cooling guide device 5 and guided so as not to deviate from a fixed path. After this, bubble 4 is
It is compressed and narrowed by the stabilizing plate 6 and the nip roller 7, and finally wound flat by a winder (not shown) to form a flat film or bag.

In addition, in the manifold die method, which is a typical T-die method, a wide tb part (manifold) is provided in a direction perpendicular to the part where the resin does not enter the die from the extruder. The widened resin is extruded through a thin linear die exit (lip). Then, a flat film is manufactured through a cooling guide device in substantially the same manner as in the case of the above-mentioned inflation method.

As described above, the cooling guide device is required in the inflation shore method or the T-die method to first increase the molding speed, improve production efficiency, and improve quality. Furthermore, the third reason is based on the manufacturing requirement i1 of guiding the film along a fixed path and winding it up with constant dimensions.

As a prior art of a cooling guide device, US Pat. A technique is disclosed in which a film is cooled and guided along a certain path by passing water while contacting an envelope circle.

However, according to this prior art, since the film is cooled and guided while being in contact with the device (conduit), local cooling unevenness occurs in the film, and the thickness of the film partially changes. Also, since the film passes through the conduit at a considerable speed, scratches may occur on the film. Furthermore, since the film comes into contact with the conduit, there remains the problem that it is difficult to increase the passing speed of the film, that is, the forming speed.

[Problem that the invention seeks to solve]

Therefore, the main object of the present invention is to obtain an improved cooling guide method and apparatus.

Another object of the present invention is to provide a cooling guide method and apparatus that do not cause uneven cooling.

Yet another object of the present invention is to provide a cooling guide method and device that does not come into contact with the film.

To this end, the present invention provides continuous passage of a film through a section constituted by one or more air introduction members each having an air intake port, and the air around the film is sucked by the air introduction member. While balancing the suction force applied to the film, the film is separated from the air introduction member and guided to a predetermined path in six states.

Still other objects of the present invention will be made clear by the description with reference to the following drawings. However, these are merely examples of the present invention, and the present invention is not limited thereto.

〔Example〕

As described above, the method and apparatus for cooling a thermoplastic synthetic resin film according to the present invention basically consists of continuously feeding the film into a section formed by one or more air introduction members each having an air intake port. The film is guided to a predetermined path while being separated from the air introducing member while balancing the suction force applied to the film by sucking the air around the film by the air introducing member. be.

That is, the basic viewpoint of the present invention is that the temperature of the bubble-shaped film is about 130°C and the temperature of the air around the film is about 40°C. The purpose is to actively draw heat through the introduction member to remove heat and enhance the cooling effect. By the way, at this time, the internal pressure of the bubble is 2 to 100 mmAq.
Therefore, the suction pressure by the air suction device is 100 to 3.
000 mmAq preferably 1,500 mmA'? shall be. Of course, during this suction operation, care must be taken to balance the suction force around the bubble;
This is achieved by adjusting the suction pressure by means of a regulating valve or the like.

In the following description, description will be made mainly on the aspect of the compartment constituted by the air introduction member.

The aspect of the air introduction member itself will be described as an additional note in the examples, but of course this aspect is still very important to the present invention.

In the first embodiment of the present invention shown in FIGS. 2 to 6, the sections are formed by envelope circles formed by a large number of air introduction members. That is, the upper and lower ends of a large number of curved air introducing members are rotatably supported, and the enveloping circular sections formed at a constant horizontal position by these air introducing members are the support members at the upper and lower ends of the air introducing members. It is designed to be deformed by rotating them relative to each other.

In the drawings, reference numeral 8 indicates an upper rotating ring, and the upper rotating ring 8 is an annular body, preferably an annular flat plate, and there are bins 9 at positions where the plane of the annular body is equally divided into, for example, 24 parts.
is suspended. Link 10 by these bins 9
One end is rotatably supported. An upper end of a curved air introducing member 12 is coupled to the other end of the link 10 by an upper joint 11 that is rotatable with respect to the link 10. As a result, the upper rotating ring 8 rotatably supports the upper ends of the multiple curved air introduction members 12 through link means such as the link 10, the bottle 9, and the upper joint 11, as shown in FIG. are doing. That is, in FIG. 4, the solid line shows the case when the air introduction member 12 is squeezed by the upper pivot ring 8 and the link means cooperating therewith, and the dotted line shows the case when it is loosened.

The lower rotation ring 13 is arranged parallel to the upper rotation ring 8 by a plurality of (for example, six) upright columns 14, and
They are attached integrally at regular intervals. The lower rotating ring 13 is also an annular body like the upper rotating ring 8, and the bubble shown in FIG. 1 passes through the inside thereof. In addition,
A groove 15 is cut in its inner circumference.

An annular lower support ring 16 is provided adjacent to the lower pivot ring 13 . The lower support ring 16 also has a number of lower communication joints 17 (which are rotatable relative to the lower support ring 16 and communicated with an air suction device to be described later) at positions where the ring body is equally divided. are provided, and the lower end of the curved air introduction member 12 is connected to these lower communication joints 17. It should be noted that, as clearly shown in the plan view of FIG. 4, the connection position between the upper rotation ring 8 (actually the link 10) and the upper end of the air introduction member 12 is between the lower end and the lower support ring. The joining position with 16 is different from the planar view (just think of part of the vortex).

Further, upright members 18 are provided upright at a plurality of locations on the lower support ring 16, and roller bearings 19 are provided at the upper ends of these upright members 18.
is cut into the inner periphery of the lower rotating ring 13 and engages with a circular groove 15. Thereby, the lower rotation ring 13 that is integral with the upper rotation ring 8 is rotated with respect to the lower support ring 16. Of course, various other modes can be considered as the relative rotation mechanism between the lower rotation ring 13 and the lower support ring 16. For example, the lower rotation ring 13 may be mounted on the lower support ring 16 via a row 2 bearing. It may also be placed.

3 and 4, one of the many air introduction members 12 is representatively illustrated. The air introduction member 1
2 may be a rigid tube curved into a certain shape (twisted like a vortex) and may be a perforated introduction member having numerous fine suction ports communicating with the internal conductive path. As for the material aspects of such a perforated introduction member, the following ones currently exist and are relatively easy to obtain.

■Pipe made of porous material ■Filter pipe made of a mesh metal sheet rolled in multiple layers into a pipe shape ■Slit pipe made of a rigid tube with holes or slits ■Pipe made of sintered metal Needless to repeat These tube bodies have a relatively large conduit passage for passing intake air therein, and have numerous fine suction ports in the tube wall.

Note that these fine inlets are for inhaling the air around the thermoplastic synthetic resin film, so they do not need to be present all around the stomach wall, but rather only in the area directly related to the film. It is also preferable for the air suction device to exist in the air in order to save the power of the pump that is the air suction device. Therefore, a fine suction port may be left only on the path side of the film, and other locations may be closed with silicone coating or heat shrink tube.

As described above, the upper end of the air introduction member 12 is
Upper joint 11, link 10. The lower end is rotatably supported by the upper rotating ring 8 via a link means such as a pin 9, and the lower end is at a circumferential position shifted from the upper end in plan view, and is connected to a lower communicating joint 1T. It is rotatably supported by the lower support ring 1B via. The position where the curvature of the large number of curved air introduction members 12 changes the most is approximately halfway between the upper and lower rotating rings 8 and 13.

As shown in FIGS. 5 and 6, the envelope circle formed by the outer periphery of a large number of curved air introduction members 12 is almost a perfect circle with respect to the center of the device (through which the bubble passes). (Of course, it is essentially a pseudo circle made up of a large number of line segments). It can be changed by rotating it.

In order to realize this relative rotation, a rotation means described below is provided. That is, as schematically shown in FIG. 4, a chain 20 is attached to two parts of the outer periphery of the lower rotation ring 13, and a sprocket 21 that engages with this chain 20 is pivoted on the lower support ring 16. has been done. Furthermore, this sprocket 21 is driven clockwise or counterclockwise by a small motor 22 equipped with a speed reduction means, and these rotating means drive the lower rotating ring 13 (this is the upper rotating ring). a), which has already been mentioned as being integral with the lower support ring 16, is rotated relative to the lower support ring 16. Of course, various other embodiments are also possible for the rotating means; for example, a rack may be cut in a part of the outer circumference of the lower rotating ring 13, and a pinion may be provided on the lower supporting ring 16. , this pinion may be driven in forward and reverse directions manually or by a motor.

In addition, as shown in FIG. 3, the lower support ring 16 includes:
A plurality of forces 2-23 are provided with internal threads. This is achieved by arranging the device of the present invention in multiple stages in the bubble traveling direction, and at this time, upright columns (not shown) having external threads are screwed to a plurality of collars 23, and the upright columns or collars 23 are rotated. This is to raise or lower the device of the present invention, which is arranged in multiple stages, in the direction in which the bubble travels, and to set it at the optimal cooling and guiding position.

Air around the bubble is sucked in through the air introduction member 12 made of the above-mentioned perforated introduction member, the lower communication joint 1T1, and a regulating valve and piping (not shown). Air is actually sucked in by an air suction device such as a pump (not shown). Preferably, such an air suction device is capable of changing the suction pressure at will.

Next, the effects of the above embodiment will be described. The lower rotating ring 13 is engaged with the lower supporting ring 16 by a roller bearing 19 so as to be relatively rotatable, and The lower pivot ring 13 can be pivoted about the center of the device by said pivot means.

At this time, the planar connection position of the upper rotating ring 8 that supports the upper end of the specific air introduction member 12 via the link means,
The planar joint position (in other words, the upper and lower joints for a particular air introduction member 12) of the lower support ring 16 that rotatably supports the lower end of the lower support ring 16 is located close to the planar position ih of 11.17 as shown in FIG. Separate. As a result, as shown in FIGS. 5 and 6, a large number of air introduction members 12
Fixed horizontal position (upper and lower rotating rings 8.1)
It is approximately in the middle of 3. ) is enlarged or reduced in diameter. This enveloping circle is actually a pseudo circle formed by a collection of many line segments, but the more air introduction members 120 there are, the closer it becomes to a perfect circle. The diameter of this envelope circle can be kept constant depending on the size of the bubble to be manufactured by stopping the motor 22.

At this time, the bubble passing vertically with a certain gap in the envelope circle (passing speed is 40 to 60 m/min, temperature is about 130°C) is passed from the fine inlet of the air introduction member 12 to the surrounding area. Since air (approximately 40° C.) is sucked in, heat is removed and the air is cooled, and it is guided accurately as a constant daily diameter. The suction force around the bubble is determined by the presence of countless fine suction ports and the adjustment of the suction pressure of the air suction device.
Balance well. Of course, the suction pressure can be changed depending on the bubble passage speed and the type of synthetic resin.

The present invention suctions the air around the bubble through an air introduction member having countless fine suction ports, so there is no uneven cooling and the wall thickness of the bubble is constant (30 to 100 μm).
) and contribute to quality improvement.

Further, since cooling and guiding are performed without contacting the bubble, there is no slight vibration of the bubble, the quality is stable, and the bubble forming speed can be dramatically improved.

Furthermore, there is no clogging of the fine suction port of the air introduction member 12, and daily maintenance is easy.

Moreover, the degree of cooling and the gap between the air introduction member 12 and the bubble can be easily adjusted by adjusting the suction pressure.

A second embodiment of the invention is shown in FIGS. 7 and 8. That is, a cooling and guiding section is constituted by a large number of air introducing members arranged in multiple stages on a plurality of horizontal planes perpendicular to the traveling direction of the film (bubble).

In the drawing, a pair of upper and lower ring members 24 are disposed opposite each other and are integrated by a coupling member 25.

The pair of upper and lower ring members 24 includes, in addition to the coupling member 25,
A plurality of support conduction pipes 26 are vertically erected. These supporting conduit tubes 26 may be rotatably engaged with the ring member 24 as shown in FIG. They are regularly arranged at positions where 24 is divided into six equal parts, for example. Furthermore, these support conduction pipes 26 are hollow inside and communicate with an air suction device (not shown). These ring member 24 and supporting conduit tube 26 constitute an annular body which is the basic frame of the device.

One end of an air introduction member 27 is fixed approximately perpendicularly to a plurality of support conduction pipes 26 that are vertically arranged in the same direction as the bubble traveling direction, at a substantially right angle. . These air introduction members 27 are straight or have curved tips, and are made of the same material as that of the first embodiment described above, and have numerous fine suction ports. The plurality of air introduction members 27 are connected approximately perpendicularly to each of the support conduction tubes 26 arranged by appropriately dividing the ring member 24, so that their tips do not collide with each other. , the support conduction pipe 26 is provided with appropriate steps in the vertical direction and extends horizontally toward the center of the annular body. As a result, as shown in FIG. 7, a large number of side portions of the tip portion come together to form a section for cooling the bubble with respect to the center of the annular body. and,
The air surrounding the bubble is sucked through the numerous fine suction ports of the air introduction member 27 to cool and guide the bubble, as in the previous embodiment. However, especially in the case of this embodiment, since the portion where air can be sucked is limited, other portions of the air introducing member 27 may be coated with silicone or the like.

In order to change the diameter of the section for cooling and guiding by the plurality of air introduction members 27, it is preferable to rotate the plurality of support conduction pipes 26 to which these air introduction members 2T are connected. However, at this time, if each of the supporting conduit tubes 26 is rotated separately, the diameter of the section, which is the envelope diameter of the front end side of the air introduction member 27, cannot be managed as an accurate envelope circle. Therefore, it is preferable to horizontally move all the air introduction members 27 simultaneously and equally using an appropriate link mechanism. Since such a link mechanism can be limited to the first embodiment and departs from the gist of the present invention, a description thereof will be omitted.

In addition to the two embodiments described above, various forms of the compartments formed by the air introduction member are possible.

The plan view of FIG. 9 shows a partition formed by a large number of air introducing members 2B disposed on a horizontal plane perpendicular to the film traveling direction. The one shown in the figure can change the diameter of the envelope circle, just like the aperture of a camera.

The plan view of FIG. 10 shows a fourth embodiment in the traveling direction of the film 29 (in this case, the direction perpendicular to the drawing).

) is shown in which a partition is formed by a large number of air introduction members 30 parallel to each other. That is, the air introduction members 30 are erected in parallel to each other at positions where the circumference is appropriately divided into equal parts. Of course, these air introduction members 30 can be moved as a whole in the direction of the center of the compartment or in the opposite radial direction to change the caliber of the compartment.

In the fifth embodiment shown in FIG. 11, a partition is formed by a pair of air introducing members 32 facing each other with a film 31 interposed therebetween. Even the cooling guide device having such a simple configuration can cool and guide the film in a non-contact state using the perforated conduit member which is the gist of the present invention.

FIG. 12 shows an embodiment that is slightly modified from the embodiment shown in FIG. The valve is for adjustment to obtain an appropriate suction pressure.

Furthermore, FIG. 13 shows a large air introduction member 3 with a completely constant inner diameter.
An embodiment in which a bubble 36 is passed through the inside of the cell 5 is shown.

Such fixed type equipment is also often used in the production of thermoplastic synthetic resin films, and the scope of the present invention extends to such equipment as well.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram for explaining a film manufacturing method using an inflation method. FIG. 2 is a perspective view showing an embodiment of the cooling guide device according to the present invention. FIG. 3 is a partially cutaway side view of FIG. 2. FIG. 4 is a partially cutaway plan view of FIG. 2. 5 and 6 are plan views showing the operation of the cooling guide device of the embodiment shown in FIG. 2. FIG. 5 shows the case where the enveloping circle has a large diameter, and FIG. 6 shows the case where the enveloping circle has a small diameter. show. FIG. 7 is a plan view showing another embodiment of the cooling guide device according to the present invention. FIG. 8 is a side view of FIG. 7. FIG. 9 is a plan view showing still another embodiment of the cooling guide device according to the present invention. FIG. 10 is a schematic plan view showing another embodiment of the present invention. FIG. 11 is a schematic side view showing another embodiment of the present invention. FIG. 12 is a schematic diagram showing another embodiment related to the embodiment shown in FIG. 11. FIG. 13 is a schematic side view showing another embodiment of the present invention. 1...Hopper, 2...Extrusion molding machine, 3...
Circular die, 4... Bubble, 5... Cooling guide device, 6... Stabilizer plate, 7... Nip roller, 8... Upper rotating ring, 9... Pin, 10...・Link, 11...Top joint,
12... Air introduction member, 13... Lower rotation ring, 14... Upright column, 15... Groove, 16
... lower support IJ ring, 17 ... lower communication joint, 18 ... upright member, 19 ... roller hair ring, 20 ... chain, 21.
・・Sprocket, 22・・Motor, 23・
...Force 2-124...Ring member, 25...Coupling member, 26...Support conduction pipe, 27...Air introduction member, 28...Air introduction member, 29...
Film, 30... Air introduction member, 31...
Film, 32... Air introduction member, 33...
・Air introduction member, 34... film, 35...
Air introduction member, 36...bubble. Patent applicant Tomy Machine Industry Co., Ltd. Figure 1 Figure 2 Figure 4 Figure 7 Country

Claims (1)

[Claims] 1. A thermoplastic synthetic resin film is continuously passed through a section formed by one or more air introduction members having air intake ports, and the air around the film is introduced into the air. A cooling guide method for a thermoplastic synthetic resin film, in which the suction force applied to the film by a member is balanced, and the film is guided to a predetermined path while being separated from an air introduction member. 2. A thermoplastic synthetic resin film is continuously passed through a section formed by one or more air introduction members having air intake ports, and the air around the film is sucked by the air introduction member. A cooling guide device for a thermoplastic synthetic resin film, which guides the film to a predetermined path while keeping the film spaced apart from an air introduction member while balancing the suction force applied to the film. 3. The cooling guide device according to claim 2, in which the section formed by the plurality of air introduction members is deformable. 4. The cooling guide device according to claim 3, wherein the air introduction member is a perforated introduction member having numerous suction ports. 5. In the cooling guide device according to claim 4, the upper and lower ends of a large number of curved introduction members with holes are rotatably supported, and the guide members are formed at a constant horizontal position by these introduction members with holes. The enveloping circular section is deformed by relatively rotating the support members at the upper and lower ends of the perforated introduction member. 6. The cooling guide device according to claim 3, in which the sections are constituted by a large number of air introduction members disposed on a horizontal plane perpendicular to the direction in which the film travels. 7. The cooling guide device according to claim 6, wherein the sections are formed by a large number of air introduction members arranged in multiple stages on a plurality of horizontal planes perpendicular to the direction in which the film travels. 8. The cooling guide device according to claim 3, wherein the sections are constituted by a large number of air introduction members parallel to the direction in which the film travels. 9. The cooling guide device according to claim 3, wherein the compartments are formed by a pair of air introduction members facing each other with a film interposed therebetween.