KR100532813B1 - Tubular film manufacturing apparatus with use of inflation forming - Google Patents

Abstract

The present invention relates to a tubular film manufacturing apparatus improved to prevent deformation of the molding in the process of cooling and / or expanding the tubular primary molding obtained through the extrusion mold of the extruder, and to enable the tubular film of uniform dimensions. will be.

In the tubular film production apparatus of the present invention, the hopper unit 10 for supplying a thermoplastic resin to which an anti-blocking agent is added, and the thermoplastic resin supplied from the hopper unit 10 by extrusion molding a tubular primary molded product A cooling mold 36 having an extruder 20 for forming a mold, a cooling tank 32 containing cooling water, and a molding guide hole 362 that allows the primary molding to fall inside the cooling tank 32. With a cooler 30 provided below the extruder 20, a take-off roll 40 for receiving the primary molded product cooled by the cooler 30 and transporting it downstream, An expander 50 receiving the primary molding from the off-roll 40 to form a secondary molding having a larger diameter than the primary molding, and pinch means 60 for superimposing and conveying the secondary molding expanded from the expander 50. ) And a winding to receive the secondary molded product from the pinch means 60 It characterized in that it comprises means (70).

Description

Tubular film manufacturing apparatus using inflation molding {TUBULAR FILM MANUFACTURING APPARATUS WITH USE OF INFLATION FORMING}

The present invention relates to an apparatus for producing a tubular film by inflation molding a thermoplastic resin, and more particularly, the deformation of the molding in the process of cooling and / or expanding the tubular primary molding obtained through the extrusion mold of the extruder The present invention relates to a tubular film production apparatus using inflation molding, which is capable of forming a tubular film having a uniform dimension and preventing deformation, and in particular, producing a heat shrink polyester tube having a uniform dimension without deformation.

The inflation molding method is a method of continuously molding a tubular film such as a tubular plastic film or a heat-shrinkable polyester tube by an extruder or the like. The plastic film produced by this molding method is widely used in various types of commodity packaging materials. It is used.

Inflation molding is a method of extruding a thermoplastic resin by an extruder to obtain a tubular primary molding, cooling and expanding the primary molding to obtain a secondary molding having a diameter larger than that of the primary molding, and then wrapping the secondary molding overlaid. The process produces a tubular film.

In addition, the apparatus for producing a tubular film includes a hopper portion into which a molding material is added, an extruder for molding the injected molding material into a tubular primary molding, and a cooler for cooling the primary molding to perform the above-described process. And an expander for expanding and molding the primary molded product delivered from the cooler, and pinch means and winding means for folding and winding the expanded secondary molded product.

Conventional tubular film manufacturing apparatus has applied cooling air to the primary molded product or immersed the primary molded product directly in a cooling water tank to perform cooling on the primary molded product. Problems have arisen on the primary moldings, and furthermore, during the cooling process, the outer diameter of the primary moldings has not been determined, which makes it difficult to obtain tubular tubes of desired dimensions.

In addition, after the cooling, the primary molding is expanded through the air blows to form a secondary molding having a diameter larger than that of the primary molding, in which process, not only does not accurately draw the primary molding In many cases, the size and shape of secondary moldings obtained through the expansion become poor.

In addition, thermoplastic resins with high heat shrinkability tend to agglomerate with each other when the tubular film is formed into a tubular film, the walls defining the tubes of the film being difficult to cope with the manufacturing process of the tubular film, while the defect rate in the manufacturing thereof. Has been one of the reasons for this.

Accordingly, the present invention has been made to solve the problems of the prior art, by extrusion molding a thermoplastic resin to which an anti-blocking agent is added into a tubular primary molding, and the primary molding the self-expanding expander To form a secondary molded article and thus a final product of the tubular film, but before the expansion, the tubular film is uniformly provided by cooling the primary molded part and having a cooler that defines the outer diameter of the primary molded part. It is an object of the present invention to provide a tubular film production apparatus using inflation molding, which can be produced in one dimension and uniform shape.

In addition, another object of the present invention is to extrude the thermoplastic resin to which the anticoagulant is added into a tubular primary molding, and to cool the primary molding, and then to expand the cooled primary molding into a double tube structure expander. Forming a secondary molding to produce a tubular film, the expander of which expands the primary molding with steam heat upstream to form the secondary molding, and downstream of which cools the secondary molding through circulation of cooling water. It is to provide a tubular film manufacturing apparatus.

In order to achieve the above object, the present invention is to form a tubular primary molding by extrusion molding a hopper portion for supplying a thermoplastic resin to which an anti-blocking agent is added, and the thermoplastic resin supplied from the hopper portion A cooler provided below the extruder, having a extruder, a cooling tank containing cooling water, and a cooling mold having a molding guide hole allowing a drop of the primary molding inside the cooling tank, and a primary molded product cooled by the cooler. A take-off roll for receiving and transporting downstream, an expander for receiving a primary molded product from the take-off roll and forming a secondary molded product having a diameter larger than that of the primary molded product; Inflation molding includes pinch means for superimposing and conveying a secondary molded product, and winding means for receiving a secondary molded product from the pinch means. And providing a tubular film production apparatus, the cooling mold is an upper end is located at the bottom of the pair of cooling water level characterized in that the molded article sized to guide the ball itself limited the outside diameter of the primary molded article.

Here, the cooling mold is preferably provided with a plurality of channel forming grooves formed in the longitudinal direction on the inner peripheral surface.

In addition, the expander of the outer wall and the inner tube forming the inner wall is disposed with a gap therebetween to allow passage of the primary molding inside the inner tube, the upstream side of the expander through the outer and inner tube A steam injection unit is provided to allow steam to be injected, and expands the primary molding by the steam to form a secondary molding, and a cooling water inlet formed on the outer side of the expander to allow the injection and discharge of the cooling water; Cooling water outlets are each provided, and the cooling water circulates along the voids to cool the secondary molded product passing through the inner tube and the inner tube inner side.

In addition, the expander is provided with a moisture discharge hole for discharging the moisture on the primary molding or secondary molding, respectively, in the appearance, while the suction hole for helping to expand the molding by sucking the expanding molding from the outside. It is preferable to provide in the.

The hopper may include a storage hopper in which the thermoplastic resin is stored and a supply hopper for receiving the thermoplastic resin from the storage hopper and supplying the thermoplastic resin to the extruder, wherein the supply hopper is in communication with a side feeder to which the anticoagulant is supplied. Do.

The pinch means further includes a pinch guide for aligning a plurality of rollers so as to form a " " shape to guide the secondary molded product toward the downstream, and the secondary molded product guided along the pinch guide for the pneumatic cylinder. And a pinch roll for conveying the secondary molded product with the rubber roller and the steel roller below the rubber roller, and a dryer installed above the pinch guide to dry the secondary molded product. It is desirable to.

<Example>

Hereinafter, the tubular film production apparatus of the present invention using inflation molding will be described with reference to FIGS. 1 to 6.

1 is a view schematically and schematically illustrating the tubular film manufacturing apparatus of the present embodiment, a process in which the thermoplastic resin is manufactured into a tubular film for packaging materials through the first molding and the second molding by the tubular film manufacturing apparatus described above. To illustrate.

2 and 3 are perspective views illustrating a part of the tubular film manufacturing apparatus of FIG. 1, and more specifically, a cooler for cooling a primary molded product tubularly molded by an extruder, as illustrated in an assembling perspective view and a separated perspective view. Drawings.

FIG. 4 is a diagram illustrating a process in which the cooler of FIGS. 2 and 3 cools the primary molding and together with the outer diameter of the primary molding.

5 and 6 illustrate an expander that expands the primary molding to form a secondary molding having a larger diameter than the primary molding, in which FIG. 5 is a perspective view of the dilator, and FIG. 5 is a cross-sectional view showing important parts of the expander.

As shown in FIG. 1, the tubular film manufacturing apparatus 1 of this embodiment is the hopper part 10 in which a thermoplastic resin is stored and supplied, and the extruder which extrudes the thermoplastic resin and forms a tubular primary molding. (20), a cooler (30) for cooling the primary molded product, a take-off roll (40) for receiving the cooled primary molded product and transporting it downstream in the film manufacturing process, and the take-off roll An expander 50 which receives the primary molding from 40 and forms a secondary molding having a diameter larger than the primary molding, and pinch means for superimposing and conveying the secondary molding expanded from the expander 50; 60 and a winding means 70 for receiving the secondary molded product from the pinch means 60.

The hopper portion 10 of the present embodiment supplies a self-stored thermoplastic resin under a command of a computer (not shown) connected to a feed hopper 12 directly connected to the extruder 20 and upstream of the feed hopper 12. A storage hopper 14 is sent to the hopper 12. At this time, the feed hopper 12 is communicated with the side feeder 16 for the addition of an anti blocking agent downstream thereof, the side feeder 16 is screwed by a motor 16a The drive method adds an anticoagulant, such as glass fibers or crumbs, in the reservoir 16b to the thermoplastic resin, thereby preventing the condensation of the tubular walls from agglomerating with each other during the manufacturing process of the tubular film, which is a primary molding or 2 The primary moldings can be easily opened during or after the process to improve workability.

The extruder 20 receives the thermoplastic resin from the hopper portion 10 and melts it, while the self-equipped screw 22 presses the thermoplastic resin with the anticoagulant to the extrusion mold 24 at its tip, thereby extruding the thermoplastic resin. Through a ring-shaped slit (not shown) provided at 24, the primary molding is performed. At this time, the extruder 20 of this embodiment is provided with a pneumatic actuator which is driven pneumatically on the downstream side, more specifically, a pneumatic gear pump 26, and pressurizes the thermoplastic resin toward the above-mentioned extrusion mold 24. This can be finely adjusted by the gear pump 26.

The primary molded primary molding continuously falls from the extruded mold 24 toward the cooler 30 below it, and the cooler 30 of the present embodiment performs cooling on the primary molded product. At the same time defining the outer diameter of the primary molding while allowing the primary molding to fall further downstream.

To this end, the cooler 30 of the present embodiment is installed inside the cooling tank 32 filled with the cooling water and the cooling tank 32 to define the outer diameter of the primary molding while allowing the primary molding to fall. A cooling mold 36 is provided.

As best shown in Figs. 2 to 4, the cooling tank 32 is provided with a cooling water inlet 33 on the side while the position is fixed and fixed to the position adjustment port (32a) while the bottom In order to install a cooling mold, a cooling mold insertion hole 35 is provided. In addition, the cooling mold 36 is installed in the cooling tank 32 so that its upper end is located below the water level h of the cooling tank 32, and guides a circular molding extending from the top to the bottom. A hole 362 is provided to allow the primary molding to fall down with the cooling water, thereby cooling the primary molding and limiting the outer diameter of the primary molding to a desired dimension.

At this time, the cooling mold 36 is to be detachably fitted to the insertion hole 35 of the aforementioned cooling tank can be applied to the manufacture of tubular film of various sizes, the radially formed on the outer peripheral surface The needle piece 364 allows the cooling mold to be loosely fitted into the insertion hole 35 of the cooling tank 32 and to be spread over the bottom of the cooling tank 32.

In addition, the cooling mold 36 has a plurality of channel forming grooves 366 formed in the inner circumferential surface thereof in the longitudinal direction, and the channel forming grooves 366 may be provided with the amount of cooling water dropped together with the primary molding. This increases the cooling water contact area of the primary molding, which greatly improves the cooling efficiency of the primary molding of the cooler 30.

Referring to FIG. 1 again, the primary molded product is dropped through the cooler 30 and then guided by the “V” type guide part 41 below and falls down to the takeoff roll 40. Take-off roll 40 is to perform a guide conveying preferably to the expander 50 while the primary molding is nested.

In this embodiment, the take-off roll 40 is composed of the rubber roller 42 and the steel roller 44 facing each other so that the rubber roller 42 can be changed in position by the pneumatic cylinder 43 Thus, the primary molding is preferably allowed to rest on the takeoff roll 40.

The take off roll 40 is guided into the dilator 50 through the ball roller 51 and the guide roll 52 continuously upstream of the dilator 50. At this time, the guide roller 52 is also composed of the upper rubber roller and the lower steel roller, the rubber roller is driven up and down by the pneumatic cylinder 53 so that the primary molding is on the guide roll 52 It is preferably seated in and guided. At this time, the up and down driving of the rubber roller may be implemented by a position sensor or a limit switch, which is obvious to those skilled in the art.

As shown in FIGS. 5 and 6, the dilator 50 extends in the horizontal direction in the form of a hollow cylindrical body as a whole, and has an outer tube 54 forming an outer wall and an inner tube 56 forming an inner wall. It is a structure that is fixed to the height adjustable on the support (57) on the table while sandwiching the voids 55 therebetween.

In addition, the expander 50, as best shown in FIG. 6, has a steam injection section 58 that allows steam to flow into the interior of the expander 50 upstream. The part 58 is formed while forming the structure in which the inlet port 58a formed on the exterior 54 and the inlet port 58b formed on the inner tube 56 communicate with each other through the air gap 55.

Therefore, when the primary molded product passes through the expander 50, when the steam is injected into the expander 50 by the injection unit 58a, the diameter of the primary molded product is expanded by about 1.5 to 4 times.

Meanwhile, the expander 50 includes at least one cooling water inlet 542a and a cooling water outlet 542b facing each other downstream of the exterior 54 to cool the secondary molded product heated and expanded by steam. The coolant injected through the coolant inlet 542a is circulated through the air gap 55 and then discharged through the coolant outlet 542b to lower the temperature of the inner wall of the expander 50, and through this drop in temperature, The expanded secondary molding is cooled.

At this time, when the cooling water injection port 542a and the cooling water discharge port 542b are arranged in succession to each other, respectively, the cooling water at a temperature of about 25 to 35 ° C. is injected through the preceding cooling water injection port and the cooling water discharge port. And discharged to perform preliminary cooling of the secondary molding, and cooling water of less than about 18 ° C. is injected and discharged through the subsequent cooling water inlet and cooling water outlet to substantially cool the secondary molding.

In addition, the expander 1 of the present embodiment further includes moisture discharge holes 544 and 564 for discharging moisture on the primary molded product or the secondary molded product, respectively, in the external appearance, while vacuuming the expanded molded product. A suction hole 546 is provided on the exterior 54 for sucking from the outside with a pump or the like to help expand the molded article.

In this case, the preceding cooling water inlet and outlet may be formed at the position of the suction hole 546, and at least one of the cooling water inlet and / or the cooling water outlet may be used as the suction hole 546.

Referring again to FIG. 1, it can be seen that the secondary molded product obtained through the expander 1 is wound on a predetermined reel by the winding means 70 which is transferred to the pinch means 60 and is folded and then folded.

The pinch means 60 is a function of superimposing the secondary molded product conveyed with the air filled therein and conveying it toward the winding means 70. The plurality of rollers are arranged so as to form an approximately " " The pinch guide 62 for guiding the tea molding convergent downstream and the secondary molded article guided along the pinch guide 62 to the upper rubber roller 64a by driving the pneumatic cylinder 63. And a pinch roll 64 for conveying the secondary molded product to the rubber roll 64a and the steel roller 64b below the pressure roll. At this time, the pinch means 60 is further provided with a dryer 66 installed on the pinch guide 62 to dry the secondary molding.

In addition, the secondary molded product folded and conveyed by the pinch means 60 is transferred to the winding means 70 provided downstream of the apparatus via a plurality of idle rolls 71, 72, 73, 74, 75. It is wound on the reel 76 by the winding means 70 is obvious to those skilled in the art, so the detailed description thereof will be omitted.

Hereinafter, the tubular film manufacturing processes for inflation molding a thermoplastic resin using the tubular film manufacturing apparatus 1 described above will be described in more detail.

<Manufacturing process 1>

After drying the thermoplastic resin of the trade name "EMBRACE" purchased from the company "EASTMAN Chemical" at a temperature of approximately 65 DEG C to remove moisture, the thermoplastic resin is filled into the hopper portion 10, and downstream of the hopper portion 10. Through the side feeder 16 of the anti-coagulant glass fiber is added to 1 to 5% by weight of the total weight to prepare a primary molding using an extruder (20). The extrusion mold temperature of an extruder is preset to 200-280 degreeC.

Thereafter, the extruded primary molded product is first cooled while falling through the cooling mold 36 of the cooler 30. At this time, the coolant temperature of the cooler is set in the range of 10 to 50 ° C. in advance.

The cooled primary molding passes through the inner hollow of the dilator 50, where steam is injected through the steam inlet 58 upstream of the dilator 50, and the primary molding is formed by the steam heat of the steam. On the expansion area of 50), it expands in correspondence with the inner diameter of the expander 50. After the expansion, the coolant at 25-35 ° C. is injected through the preceding coolant inlet to circulate between the inner tube and the exterior of the expander and then It is discharged through the cooling water outlet of the primary cooling of the molding being expanded in the expander. Thereafter, the cooling water of about 12 to 18 ° C. is injected through the other cooling water inlet 542a which follows, and circulates the air gap 55 between the inner tube 56 and the exterior 54 of the expander 50, and then The heat-shrinkable polyester tube was produced by cooling the expanded secondary molded product discharged through the corresponding trailing cooling water inlet 542b.

Thereafter, the secondary molded product formed by expansion and cooling, that is, the soft shrinkable polyester tube, is preferably wound on the reel by winding means 70 provided downstream thereof while being superimposed through the pinch means 60, and a manufacturing process thereof. Is complete.

<Manufacturing Process 2>

After drying various thermoplastic resins at appropriate temperatures to remove moisture, the thermoplastic resins are mixed in the composition ratios of Table 1 and filled in the hopper 10.

Thereafter, as in the manufacturing process 1, the glass fiber, which is an anticoagulant, is added through the side feeder 16, and then extruded by an extruder 20 to form a primary molded product. Thereafter, the primary molded product is passed through the cooler 30 to be cooled, and at the same time, the outer diameter of the primary molded product is defined, and then, the second secondary having a diameter larger than the primary molded product is passed through the expander 50. A molding, i.e., a heat shrinkable polyester tube, is formed, and the heat shrinkable polyester tube is wound around the reel by the weight winding means 70 superimposed by the pinch means 60 to complete the entire manufacturing process.

division "EMBRACE" resin APET PBT PETG Creation costs 1 100 wt% - - - Creation costs 2 - 20 wt% 10 wt% 70 wt% Creation costs 3 70 wt% 10 wt% 10 wt% 10 wt% Creation costs 4 - - 20 wt% 80 wt% Creation costs 5 - - 10 wt% 90 wt% Creation costs 6 - - 70 wt% 30 wt%

In Table 1, the "EMBRACE" resin, APET resin, PBT resin and PETG resin were used to remove moisture by drying at 65 ° C, 150 ° C, 60 ° C and 68 ° C, respectively, before introduction into the hopper.

After the manufacturing process 1 and 2 using the tubular film device of the present embodiment to produce a tubular film for packaging material, and visually inspected the tubular film, it can be confirmed that the tubular film of the desired dimensions without deformation or wrinkles. there was.

As described above, the present invention, in the process of cooling the primary molded product formed by extrusion of the thermoplastic resin, prevents undesirable deformation or wrinkles from occurring on the primary molded product, and further, during the cooling process, the primary molded product The outer diameter of is preferably limited to a cooling mold, thereby providing the effect that the production of a tubular film with uniform dimensions and no deformation and wrinkles is possible.

In addition, the present invention provides the effect that an accurate expansion of the primary molding is possible, corresponding to the hollow inner diameter of the expander, and that the dimensions and shape of the secondary molding obtained through the expansion are very good.

In addition, the present invention further prevents a phenomenon in which the wall surfaces defining the tubes of the film agglomerate with each other, thereby providing an effect of facilitating the production of the tubular film and lowering the defective rate of the produced film.

In addition, the present invention has the effect of being able to remove moisture on the secondary molding (or tubular film) before winding up, thereby enabling clean management of the tubular film produced.

1 is a view schematically and schematically illustrating a tubular film manufacturing apparatus using inflation molding according to the present embodiment, wherein the thermoplastic resin is subjected to primary molding and secondary molding by the tubular film manufacturing apparatus, and then a tubular film for packaging materials. The figure which exemplifies the process manufactured as a whole.

Figure 2 is a perspective view of the cooler of Figure 1 tubular film manufacturing apparatus.

Figure 3 is an exploded perspective view showing the cooling tank and the cooling mold of the cooler of Figure 2 separated from each other.

4 is a schematic illustration of the process by which the cooler of FIGS. 2 and 3 cools the primary molding together with defining the outer diameter of the primary molding;

FIG. 5 illustrates an expander for expanding a primary molding to form a secondary molding having a diameter larger than that of the primary molding, wherein the molding traveling in the direction of the arrow is shown in phantom.

FIG. 6 shows, in cross section, an important part of the FIG. 5 expander;

<Description of Signs of Major Parts of Drawings>

10: hopper portion 20: extruder

24: extrusion mold 30: cooler

32: cooling tank 34: cooling mold

40: take off roll 42; "v" shaped guide

50: expander 58: steam inlet

60: pinch means 70: winding means

Claims (6)

A hopper part 10 for supplying a thermoplastic resin to which an anti-blocking agent is added; An extruder 20 for extruding the thermoplastic resin supplied from the hopper part 10 to form a tubular primary molded product; The extruder 20 is provided with a cooling mold 36 having a cooling tank 32 containing cooling water and a molding guide hole 362 that allows the primary molding to fall inside the cooling tank 32. A cooler 30 provided at a lower portion thereof; A take-off roll 40 for receiving the primary molded product cooled in the cooler 30 and transporting it downstream; An expander (50) for receiving a primary molded product from the take-off roll (40) to form a secondary molded product having a diameter larger than that of the primary molded product; Pinch means (60) for superimposing and conveying the secondary molded product expanded from the expander (50); It includes a winding means 70 for receiving the secondary molding from the pinch means 60, The cooling mold 36 is tubular with inflation molding, the upper end of which is positioned below the cooling water level (h) of the cooling tank and its size is formed so that its molding guide hole 362 defines the outer diameter of the primary molding. Film manufacturing equipment. The method of claim 1, The cooling mold (36) is a tubular film manufacturing apparatus using inflation molding, characterized in that it comprises a plurality of channel forming grooves (366) formed in the longitudinal direction on the inner peripheral surface. The method of claim 1, In the dilator 50, an outer tube 54 forming an outer wall and an inner tube 56 forming an inner wall are disposed with a gap 55 therebetween to allow passage of the primary molded product inside the inner tube 56. Allow, An upstream side of the expander 50 is provided with a steam injection unit 58 that allows steam to be injected past the exterior 54 and the inner tube 56, thereby expanding the primary molding by steam. Form, A downstream side of the expander 50 is provided with a coolant inlet 58a and a coolant outlet 58b formed on the exterior 54 to allow injection and discharge of the coolant, respectively, and the coolant circulates along the voids 55 so that An inner tube (56) and the tubular film production apparatus using inflation molding characterized in that the cooling of the secondary molding passing through the inner tube (56). The method of claim 3, wherein The dilator 50 has moisture discharge holes 544 and 564 for discharging moisture on the primary molded product or the secondary molded product, respectively, and is provided on the exterior, while sucking the expanded product from the outside to expand the molded product. An apparatus for producing a tubular film using inflation molding, comprising a suction hole 546 for assistance on the outer surface 54. The method of claim 1, The hopper unit 10 includes a storage hopper 14 storing a thermoplastic resin and a supply hopper 12 for receiving a thermoplastic resin from the storage hopper 14 and supplying the thermoplastic resin to the extruder 20. The feed hopper 12 is tubular film manufacturing apparatus using inflation molding, characterized in that the communication is made in communication with the side feeder 16 is supplied with an anticoagulant. The method according to claim 1 or 5, wherein the pinch means 60, A pinch guide 62 for aligning the plurality of rollers so as to form a " " The secondary molded product guided along the pinch guide 62 is pressed by the upper rubber roller 64a by the pneumatic cylinder 63 to be foamed, and then the rubber roller 64a and the steel roller 64b below it. A pinch roll 64 for conveying the secondary molded product by  An apparatus for manufacturing tubular film using inflation molding, comprising a dryer (66) installed above the pinch guide (62) to dry the secondary molding.