JP2010247453A - Inflation molding apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inflation molding apparatus which makes hermetical sealing of the whole apparatus from the outside unnecessary. <P>SOLUTION: Molten resin is forcibly fed by a resin force-feeding mechanism 20 and is extruded from a resin extrusion port 12 to provide a cylindrically molded resin film PF. When the resin film PF thus molded contains low molecular weight compound etc., the resin film is volatilized as gas. The volatile gas however is sucked by a gas suction mechanism 70 and is treated. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an inflation molding apparatus.

  Currently, an inflation molding apparatus is used as an apparatus for molding a resin into a cylindrical shape. As shown in FIG. 5, a general inflation molding apparatus 100 pumps molten resin and an annular die 10 in which an annular resin extrusion port 12 having a predetermined width having an air blowing port 11 is formed. The resin pressure feed mechanism 20 that extrudes from the resin extrusion port 12, the air pressure feed mechanism 30 that pressure-feeds the air AR and blows it out from the air blowout port 11, and the resin that is pushed out from the resin pushout port 12. And a film air cooling mechanism 40 that blows air AR from the outside on the outer peripheral surface of the resin film PF (melted or semi-molten state) formed into a shape swelled into a cylindrical shape by the air AR thus formed.

  More specifically, the film air cooling mechanism 40 includes, for example, one or more annular air cooling blow pipes 41 to 43 surrounding the cylindrical resin film PF in a circular shape, and air AR to the air cooling blow pipes 41 to 43. And a compressor 44 for pumping.

  In the air-cooled air blow pipes 41 to 43, a large number of slit-like or small-hole-like openings 45 are continuously formed at an inner position facing the resin film PF. In the air-cooled air blow pipes 41 to 43 shown in the figure, the opening 45 is formed in a slit shape, but there is also a product (not shown) made up of a large number of small holes formed continuously.

  A plurality of forming rollers 50 are arranged above the air-cooled air blow pipes 41 to 43 so as to sequentially form a cylindrical resin film PF into a flat shape. For example, a cylindrical shape formed into a flat shape on the side thereof. A take-up roller 51 for winding the resin film PF is disposed.

  In the inflation molding apparatus 100 having the above-described structure, the resin pumping mechanism 20 pumps molten resin and extrudes it from the resin extrusion port 12, and is molded into a cylindrical shape by the air AR blown out from the air outlet 11. Resin film PF (molten or semi-molten).

  The resin film PF molded in this way is air-cooled by the air AR ejected from one or more air-cooled air blow pipes 41 to 43. Note that after the air AR supplied from the air outlet 11 is supplied at the start of operation, the supply is stopped by closing a normal on-off valve (not shown).

  The air-cooled resin film PF is sequentially formed into a flat shape by the forming roller 50 and is taken up sequentially by the take-up roller 51. The resin film PF wound up in this way is used as a material for a resin bag (not shown), for example.

  In addition, in the raw material resin composition molded by the inflation molding apparatus 100 as described above, various additives such as stabilizers and physical properties of the composition are used in the resin as the composition raw material or when adjusting the composition. Low molecular compounds for improvement are included.

  However, these additives and low molecular weight compounds include those that decompose into low molecular weight compounds with lower molecular weight due to the heat applied when the resin is melted, and those that are low molecular weight compounds that tend to volatilize at high temperatures. . For this reason, when molding the resin film PF, these low molecular compounds may become volatile gases and volatilize in the molding site, which may affect the working environment such as generation of odor.

  As the inflation molding apparatus, for example, there is a proposal of an inflation molding apparatus having an air ring applicable to a wide range of blow ratios. The inflation molding device is a thermoplastic resin inflation film molding device comprising at least an annular die and a bubble cooling air ring, wherein the bubble cooling air ring is concentric with at least one slit for blowing a cooling medium onto the molten resin. It is comprised from the some rectification | straightening pipe | tube arrange | positioned and movable up and down (refer patent document 1).

  There has also been proposed an inflation molding apparatus for the purpose of producing a high-quality tubular film continuously for a long time and stably at high speed. In the inflation molding apparatus, a thermoplastic resin is extruded from an annular die, and in an inflation design apparatus for molding a tubular film, from a first outlet of a cooling device provided so as to be blown in a direction perpendicular to the extrusion direction of the molten resin. While blowing air, air is blown from the 2nd blower opening provided so that it may blow out further according to the extrusion direction of molten resin from it further, and a molten resin is cooled (for example, refer patent document 2).

JP 2000-25109 A JP-A-5-169529

  In the inflation molding apparatus 100 as described above, the resin film PF molded as described above may emit volatile gas and affect the surrounding work environment. In order to prevent the diffusion of volatile gas to the outside. It is necessary to seal the entire inflation molding apparatus 100 in the sealing facility 60 and process the volatile gas by the gas processing mechanism 61.

  For this reason, in order to seal the whole inflation molding apparatus 100 in the sealing facility 60, the whole system is large-scale, and the operability of the inflation molding apparatus 100 is also hindered.

  The present invention has been made in view of the above-described problems, and provides an inflation molding apparatus that does not require a large-scale sealing facility.

  The inflation molding apparatus of the present invention has at least one gas suction mechanism that sucks an atmosphere from the outer peripheral surface of a cylindrical resin film that is sequentially extruded from a resin extrusion port.

  Therefore, in the inflation molding apparatus of the present invention, an annular resin extrusion port having a predetermined width is formed around the air blowing port in the annular die. Then, the molten resin is pumped and extruded from the resin extrusion port by the resin pumping mechanism.

  The gas suction mechanism sucks the atmosphere from the outer peripheral surface of the resin film swelled into a cylindrical shape by the air blown from the air blowout port (the resin film immediately after coming out of the resin extrusion port is in a molten or semi-molten state) .

  For this reason, the gas which volatilizes from the surface of the resin film formed in the cylindrical shape is sucked by the gas suction mechanism. This gas suction mechanism may be provided over the entire circumference of the cylindrical resin film or may be a part thereof.

  Moreover, the above-mentioned inflation molding apparatus may further include at least one film air cooling mechanism that blows air from the outside to the outer peripheral surface of the resin film that is sequentially extruded in a cylindrical shape.

  In the inflation molding apparatus as described above, the gas suction mechanism and the film air cooling mechanism may be adjacent to each other in the axial direction at a position facing the outer peripheral surface of the resin film sequentially extruded in a cylindrical shape from the outside.

  Further, in the inflation molding apparatus as described above, the first film air cooling mechanism, the gas suction mechanism, and the second film air cooling mechanism are axially arranged at positions facing the outer peripheral surface of the resin film sequentially extruded in a cylindrical shape from the outside. They may be arranged in order in the direction.

  In the inflation molding apparatus as described above, the first film air-cooling mechanism and the second film air-cooling mechanism have an opening for blowing air in a slit shape, and the gas suction mechanism is an opening for sucking the atmosphere. You may consist of many small holes in which a part continues.

  The various components of the present invention do not necessarily have to be independent of each other. A plurality of components are formed as a single member, and a single component is formed of a plurality of members. It may be that a certain component is a part of another component, a part of a certain component overlaps with a part of another component, or the like.

  In the inflation molding apparatus of the present invention, the gas suction mechanism sucks the atmosphere from the outer peripheral surface of the resin film formed into a cylindrical shape. For this reason, the gas volatilized from the surface of the resin film is sucked by the gas suction mechanism. Therefore, it is possible to expect an inflation molding apparatus that does not require a large-scale sealing facility.

It is a typical longitudinal section front view showing the whole structure of an inflation molding device of an embodiment of the invention. It is a typical perspective view which shows the principal part of an inflation shaping | molding apparatus. It is a typical vertical front view which shows the principal part of an inflation shaping | molding apparatus. It is a typical vertical front view which shows the principal part of the inflation shaping | molding apparatus of one modification. It is a typical vertical front view which shows the whole structure of the inflation molding apparatus of one prior art example.

  An embodiment of the present invention will be described below with reference to FIGS. However, the same parts as those of the conventional example described above with respect to the present embodiment are denoted by the same names and symbols, and detailed description thereof is omitted.

  In the present embodiment, description will be made by defining the front-rear, left-right, up-down directions as shown. However, this is provided for the sake of convenience in order to briefly explain the relative relationship between the components. Therefore, the direction at the time of manufacture and use of the product which implements the present invention is not limited.

  As shown in FIG. 1, the inflation molding apparatus 200 according to the present embodiment includes an annular die 10 in which an air outlet 11 having a predetermined diameter and an annular resin extrusion port 12 having a predetermined width are formed, and a molten resin. Is formed of a resin pumping mechanism 20 that pumps out air from the resin extrusion port 12, a pneumatic feeding mechanism 30 that pumps air AR through the air blowout port 11, and resin that is sequentially extruded from the resin extrusion port 12. And a gas suction mechanism 70 that sucks an atmosphere from the outer peripheral surface of the resin film PF formed into a cylindrical shape by the air AR blown from the mouth 11.

  More specifically, the inflation molding apparatus 200 of the present embodiment also has a film air cooling mechanism 40 that blows air AR from the outside to the outer peripheral surface of the resin film PF formed into a cylindrical shape.

  However, as shown in FIGS. 1 to 3, the air-cooling air blow pipe 41 of the film air-cooling mechanism 40 is a series, and the first / second gas suction pipes 71 and 72 of the gas suction mechanism 70 are arranged above and below the air-cooling blow pipe 41. Has been placed.

  These gas suction pipes 71 and 72 are structurally formed with a large number of small holes and slit-like openings 45 at the inner positions facing the resin film PF, similarly to the air-cooled blower pipe 41. In the gas suction pipes 71 and 72 and the air-cooled blower pipe 41 shown in the figure, the opening 45 is formed in a slit shape.

  A compressor 44 that pumps the air AR is connected to the air-cooled air blow pipe 41, and the first and second gas suction pipes 71 and 72 suck and process the gas volatilized from the resin film PF. A gas processing mechanism 61 is connected. Further, the uniform air volume of the gas suction pipes 71 and 72 and the air cooling air volume of the air-cooled air blow pipe 41 are set to 1: 2, for example.

  Also, in the inflation molding apparatus 200 of the present embodiment, a plurality of molding rollers 50 are arranged above the air-cooled air blowing pipes 41 to 43 so as to sequentially mold the cylindrical resin film PF, for example, A winding roller 51 for winding a flat cylindrical resin film PF is arranged on the side.

  In the configuration as described above, in the inflation molding apparatus 200 of the present embodiment, the resin pumping mechanism 20 pumps the melted resin and pushes it out from the resin extrusion port 12. The molten resin sequentially extruded from the resin extrusion port 12 swells in a cylindrical shape by the air AR blown from the air blowing port 11 to form a resin film PF formed in a cylindrical shape.

  The resin film PF molded in this way is air-cooled by the air AR blown from the air-cooling blower pipe 41. At the same time, the atmosphere is cooled by air suction by the gas suction pipes 71 and 72.

  The air-cooled resin film PF is sequentially formed into a flat shape by the forming roller 50 and is taken up sequentially by the take-up roller 51. The resin film PF wound up in this way is used as a material for a resin bag (not shown), for example.

  Also in the inflation molding apparatus 200 of the present embodiment, the molded resin film PF is volatilized using a low molecular compound or the like as a gas. However, the gas is sucked from the gas suction pipes 71 and 72 of the gas suction mechanism 70 and processed by the gas processing mechanism 61.

  Therefore, in the inflation molding apparatus 200 of the present embodiment, it can be expected that it is unnecessary to seal the entire apparatus from the outside and treat the gas volatilized from the resin film PF.

  For this reason, the scale of the entire system can be reduced, and the operability of the inflation molding apparatus 200 can be improved. Moreover, the resin film PF is air-cooled even when the gas suction pipes 71 and 72 suck the atmosphere AR from the outer peripheral surface of the resin film PF as described above.

  For this reason, even if the air-cooling blower pipe 41 is reduced to one-third as compared with the conventional inflation molding apparatus 100, it can be expected that the performance of air-cooling the resin film PF is maintained to be equal.

  Furthermore, in the inflation molding apparatus 200 of the present embodiment, the gas suction pipes 71 and 72 that suck the atmosphere AR from the outer peripheral surface of the resin film PF and the air-cooled blow pipe 41 that blows the air AR are alternately arranged. For this reason, it is possible to prevent the resin film PF from sticking to the gas suction pipes 71 and 72 that suck the atmosphere AR by blowing air from the air-cooled blow pipe 41.

  In particular, the uniform air volume of the gas suction pipes 71 and 72 and the air cooling air volume of the air-cooled air blow pipe 41 are set to 1: 2. For this reason, it can be expected that the air AR blown from one air-cooled blower pipe 41 is sucked into the two gas suction pipes 71 and 72 through the surface of the resin film PF.

  In addition, the inflation molding apparatus 200 of the present embodiment can be easily realized by using a part of the plurality of air-cooled air blowing pipes 41 to 43 of the conventional inflation molding apparatus 100 as the gas suction pipes 71 and 72. it can.

  In addition, even in the case of a series of air-cooled blower tubes of an existing inflation molding device (not shown), for example, by adding the air-cooled blower tube and using it as a gas suction tube, the inflation molding of the present embodiment The apparatus 200 can be realized.

  The present invention is not limited to the present embodiment, and various modifications are allowed without departing from the scope of the present invention. For example, in the said form, it illustrated that the gas suction pipes 71 and 72 and the air-cooling ventilation pipe | tube 41 were arranged alternately.

  However, as described above, the outer peripheral surface of the resin film PF can be air-cooled even by suction of the atmosphere by the gas suction tube. Therefore, it is not impossible to dispose only the gas suction pipe at the position facing the outer peripheral surface of the resin film PF and not to place the air-cooled air blow pipe (not shown).

  Further, in the above embodiment, the gas suction pipes 71 and 72 and the air cooling blower pipe 41 are alternately arranged, so that the resin film PF is prevented from sticking to the gas suction pipes 71 and 72 by the air blow of the air cooling blower pipe 41. Exemplified what to do.

  However, if the resin film PF still sticks to the gas suction pipes 71 and 72, as shown in FIG. 4, the air-cooled blower pipes 41 and 42 are arranged above and below the single gas suction pipe 71, and the gas suction is performed. It is preferable to hold the resin film PF above and below the pipe 71 by blowing air from the air-cooled blow pipes 41 and 42.

  In that case, as shown in the figure, the opening 45 of the air-cooled air blowing pipes 41 and 42 can be formed in a slit shape, and the opening 46 of the gas suction pipe 71 can be formed by a large number of continuous small holes.

  By doing in this way, while air-cooling holding the resin film PF favorably with the air AR injected from the slit-shaped opening 45 of the air-cooling blower pipes 41 and 42, the air suction air pipes 41 and 42 are air-cooled. It is possible to satisfactorily prevent sticking while suctioning harmful gas from the resin film PF through the opening 46.

  Furthermore, in the figure used by description of the said form, it illustrated that the gas suction pipes 71 and 72 and the air-cooling ventilation pipe | tube 41 were formed in total 3 series. However, as a matter of course, this may be formed by two lines of one gas suction pipe and one air-cooled blower pipe, or may be formed by four or more lines (not shown).

  Moreover, in the said form, it illustrated that the opening part 45 through which the air AR and atmosphere AR flow was formed in the slit shape inside the gas suction pipes 71 and 72 and the air-cooling ventilation pipe 41. However, the openings through which the air AR and the atmosphere AR flow may be formed with a large number of continuous small holes (not shown) inside the gas suction pipe or the air-cooled air blow pipe.

  Furthermore, in the said form, it illustrated only having arrange | positioned the gas suction pipes 71 and 72 in the position facing the outer peripheral surface of the resin film PF shape | molded by the cylindrical shape. However, the gas is also volatilized from the inner peripheral surface of the resin film PF formed into a cylindrical shape.

  Therefore, it is not impossible to dispose a gas suction pipe (not shown) that sucks the atmosphere AR from the inner peripheral surface of the resin film PF formed into a cylindrical shape. In addition, by sticking the gas suction tube for sucking the inner peripheral surface of the resin film PF and the gas suction tube for sucking the outer peripheral surface in this manner (not shown), sticking of the resin film PF due to the suction is prevented. You can also.

  Moreover, in the said form, it assumed that the internal diameter of the gas suction pipes 71 and 72 and the air-cooling ventilation pipe 41 was uniform. However, these inner diameters may be different (not shown). For example, as shown in the drawing, the resin film PF expands upward in a conical shape, and therefore gas suction pipes 71 and 72 and an air cooling blower pipe 41 may be formed on the inner diameter corresponding to this (not shown). ).

  Furthermore, in the said form, although it assumed that the uniform air volume of the gas suction pipes 71 and 72 and the air cooling air volume of the air-cooling ventilation pipe | tube 41 were set to 1: 2, it can also be assumed that these are also set to various. Moreover, various wind speeds can be set separately from such air volume.

  Needless to say, the above-described embodiment and a plurality of modifications can be combined within a range in which the contents do not conflict with each other. Further, in the above-described embodiments and modifications, the structure of each part has been specifically described, but the structure and the like can be changed in various ways within a range that satisfies the present invention.

DESCRIPTION OF SYMBOLS 10 Ring die 11 Air blowing port 12 Resin extrusion port 20 Resin pumping mechanism 30 Pneumatic feeding mechanism 40 Film air cooling mechanism 41 Air cooling blower pipe 42 Air cooling blower pipe 43 Air cooling blower pipe 44 Compressor 45 Opening part 50 Forming roller 51 Winding roller 60 Sealing Equipment 61 Gas processing mechanism 70 Gas suction mechanism 71 Gas suction pipe 72 Gas suction pipe 100 Inflation molding apparatus 200 Inflation molding apparatus AR Air, atmosphere PF Resin film

Claims (5)

  An inflation molding apparatus having at least one gas suction mechanism for sucking an atmosphere from an outer peripheral surface of a cylindrical resin film sequentially extruded from a resin extrusion port.   The inflation molding apparatus according to claim 1, further comprising at least one film air cooling mechanism that blows air from the outside to the outer peripheral surface of the resin film that is sequentially extruded in a cylindrical shape.   The inflation molding apparatus according to claim 2, wherein at least one of the gas suction mechanism and the film air cooling mechanism is adjacent to each other in the axial direction at a position facing the outer peripheral surface of the resin film sequentially extruded in a cylindrical shape from the outside. .   The first film air-cooling mechanism, the gas suction mechanism, and the second film air-cooling mechanism are sequentially arranged in the axial direction at positions facing the outer peripheral surface of the resin film that is sequentially extruded in a cylindrical shape from the outside. The inflation molding apparatus according to claim 2 or 3.   In the first film air cooling mechanism and the second film air cooling mechanism, an opening for blowing the air is formed in a slit shape, and the gas suction mechanism has a number of continuous openings for sucking the atmosphere. The inflation molding apparatus according to claim 4, comprising a small hole.

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