KR100986996B1 - Apparatus and Method for Manufacturing Hollow Molded Products - Google Patents

Abstract

A device and method are provided for producing a blow molded article, in particular a synthetic resin panel comprising a hollow portion.

The apparatus for manufacturing a hollow molded product of the present invention is an example of the configuration, and is an apparatus for manufacturing a hollow molded product having a hollow part therein, and includes one or more cores to be molded while the injected raw material is extruded to form a hollow part of the molded product. And a hollow portion cooling means provided in the core of the die unit and provided with a cooling fluid to cool the molding hollow portion formed while passing through the core, wherein the hollow portion cooling means provided in the core includes: It may be configured to include one or more cooling fluid jet port provided in the core.

According to the present invention, by providing the molding hollow portion cooling means in the core for forming the hollow portion of the molding, the hollow portion shape of the molding having a multi-stage hollow portion is stably molded, and in particular, the hollow portion of the molding is excellent in cooling properties Even at high speeds, the quality of the product can be maintained, resulting in an improved effect of ultimately improving the productivity of the hollow moldings.

Blow Molding, Hollow Panel, Synthetic Resin Hollow Panel, Blow Molding Manufacturing Equipment

Description

Apparatus and Method for Manufacturing Hollow Molded Products}

The present invention relates to an apparatus and a method for producing a hollow molded article, in particular a hollow panel made of synthetic resin, and more particularly, by providing a molded hollow part cooling means in a core for forming a hollow part of a molded part, The present invention relates to a hollow molding apparatus and method for stably forming a part, and particularly, having excellent hollow cooling properties of a molding, thereby maintaining product quality even when molding the molding at high speed, thereby ultimately improving productivity of the hollow molding.

For example, synthetic resin panels are mainly used as walls in construction sites, walls of structures such as large water tanks, or walls for inducing water flow in water and sewage treatment plants.

For example, in the past, wood or iron panels were mainly used as walls for construction members, but recently, synthetic resin panels mainly containing polyethylene are used.

Since the synthetic resin panel is mainly composed of polyethylene (PE) having excellent corrosion resistance, it has a strong chemical stability, does not easily react with external materials, has a high strength, and can be plastic welded to provide good workability. It is widely used in buildings and structures such as transportation vehicles, refrigeration, refrigeration, low-temperature warehouses, parking towers, shops and exhibition halls.

On the other hand, in recent years, in order to be able to withstand high loads and bending stress from the exterior, the use of the hollow synthetic resin panel which formed the space, ie, a hollow part, is increasing.

For example, as shown in FIG. 1, a known hollow molding, for example, the hollow panel 100 has a hollow 110 therein.

However, when the hollow panel 100 passes through the inner cores of the die unit into which the synthetic resin raw material is input during manufacturing, the hollow part 110 is formed inside the panel body 100a.

Then, the panel body 100a having the hollow part 110 through the die unit maintains the shape of the panel through the hollow suction (see arrow) when passing through the sizing unit 120.

However, as shown in FIG. 1, since the portion 'A' around the inner hollow portion of the hollow panel 100 is not well cooled, the hollow portion of the panel is recessed or the warpage deformation easily occurs, in particular, the cooling is poor. If the raw material is added, extruded, and molded too quickly, the hollow part is depressed or deformed as described above. The production speed of the blank panel was very slow.

Therefore, in the production of a conventional hollow molded article (hollow panel made of synthetic resin), it is difficult to produce the molded article at a very slow rate, and in particular, to form the hollow part in multiple stages inside the molded article.

For example, since the part which becomes difficult to cool increases as the hollow part is formed in multiple stages, molding is manufactured slowly by that much.

Accordingly, the applicant of the present invention has proposed the present invention, which is easy to maintain the shape even when the inner hollow portion of the panel, that is, the hollow molded product is formed in multiple stages, and the hollow molded product is easily manufactured even if it is molded quickly.

The present invention has been proposed to solve the conventional problems as described above, the object of the aspect is, by providing a molding hollow portion cooling means in the core for forming the hollow portion of the molding, the hollow portion of the molding having a multi-stage hollow portion stably The present invention provides a blow molding apparatus and a method for forming a molded product, in particular, excellent in cooling the hollow part of the molded part, thereby maintaining the quality of the product even when the molded part is molded at a high speed, thereby ultimately improving the productivity of the blow molded part.

As a technical aspect for achieving the above object, the present invention is a device for manufacturing a hollow molded article having a hollow portion therein, at least one core for being molded while the injection molding material is injected into the forming the hollow portion of the molding A die unit having a; And,

Hollow part cooling means provided in the core of the die unit and provided to cool the molding hollow part formed while passing through the core with a cooling fluid;

Consists of including
The hollow part cooling means provided in the core provides a hollow molded product manufacturing apparatus including one or more cooling fluid ejection holes provided in the core.

In another technical aspect, the present invention provides a method for manufacturing a hollow molding having hollow parts by passing a raw material into a die unit and extruding the core of the die unit; And,

Cooling the hollow part simultaneously with molding the molded product by ejecting a cooling fluid into the molded part hollow part through the hollow part cooling means provided in the core;

Consists of including
The cooling fluid inlet of the cooling water or the cooling water containing the lubricating material is injected into the molding hollow through the cooling fluid ejection opening of the hollow cooling means provided in the core, and the cooling fluid inlet provided in the core is adjacent to the cooling fluid ejection opening. It provides a hollow molded product manufacturing method of suction treatment of the cooling fluid ejected through.

According to the hollow molding production apparatus and method of the present invention as described above, by providing the molding hollow portion cooling means in the core for forming the hollow portion of the molded article, the hollow portion form of the molding having a multi-stage hollow portion is stably molded, in particular The hollow part of the molding is excellent in cooling, and even when the molding is molded at a high speed, the shape and quality of the product are maintained.

Thus, the present invention ultimately dramatically improves the productivity of the hollow moldings.

Hereinafter, a preferred embodiment of the present invention according to the accompanying drawings in detail as follows.

First, FIGS. 2 to 4 illustrate a hollow molded product manufacturing apparatus 1 for manufacturing a hollow molded product 10 according to the present invention, for example, a hollow panel.

That is, as shown in Figures 2 and 4, the hollow molded product manufacturing apparatus 1 of the present invention for producing a hollow molded product 10 having a hollow portion 12 therein, the molding raw material (14) largely injected The die unit 30 and one or more cores 32 for forming the hollow portion 12 of the molding, and the core 32 of the die unit 30 is provided It is configured to include a hollow portion cooling means (50) provided to cool the molding hollow portion 12 to be molded while passing.

In addition, as shown in FIG. 2, the die unit 30 is connected with a feeder 16 for introducing a raw material 14, that is, a raw material 14 made of polyethylene (PE), high strength polyethylene (HDPE), or the like.

Such an injector 16 is provided with a screw 16a motor-driven therein and a fuel injection hopper 16b thereon as shown in FIG. 2, and a main body 30a of the die unit 30 through a connecting pipe 16c. Connected.

In addition, the apparatus of the present invention further includes a sizing unit 70 which is provided to maintain the form of the molding through vacuum suction while being connected to the die unit 30.

At this time, as shown in Figure 2 and 8, the sizing unit 70 passes through the core 32 through the vacuum suction to suck the molding from the outer portion of the molding 10 in which the hollow portion 12 is formed to the outer surface of the molding It is a facility in which deformation such as bending of the molding or bending of the entire molding is prevented from occurring. The hollow plate 74 with the holes 72 is disposed outside the hollow molding, and air is blown out. It comprises a sizing body 78 to which the suction hollow tube 76 is connected.

Therefore, in the hollow molded product manufacturing apparatus 1 of the present invention, when the raw material 14 is introduced into the main body 30a of the die unit 30 via the feeder 16, the die unit main body 30a and its The one or more cores 32 disposed inside are manufactured in the molding 10 having the hollow portion 12 while the raw material is passed through, and finally proceeded as a feed roll 18 disposed on the exit side of the sizing unit 70. While being cut to a predetermined length in the cutter 20 is manufactured.

In this case, as shown in FIG. 3, the arrangement of the hollow part 12 of the molding 10 may be determined according to the arrangement of the cores 32 provided in the die unit 30.

In particular, in the present invention, the hollow part cooling means 50 to be described in detail in the following, because the hollow part cooling of the difficult part, such as the 'A' part of the existing Figure 1 smoothly, to increase the molding extrusion progression speed The shape of the molding and the hollow part is maintained as it is to enable to increase the product productivity.

In this case, as shown in FIGS. 2 and 5, the cores 32 provided in the die unit 30 are connected to the die unit body 30a and the cores as brackets 38 and 38 ′.

Preferably, the brackets are arranged close to the inner end 32a of the core 32, as shown in FIG. 5, to allow the raw material 14 to be directly bonded to each other while passing through the brackets at the beginning.

4 and 5, the brackets connecting the core and the die unit of the present invention are formed of a streamlined bracket 38 when the cooling fluid passage 44 to be described below is formed. It is preferable to use a thin thin plate bracket 38 'in the case where the corner is formed and the cooling fluid passage 44 is absent.

As described above, when the raw material passes through the bracket, the gap is so large that the gap does not occur in the molding to be molded.

On the other hand, as shown in Figures 3 to 5, the hollow portion cooling means 50 provided in the core 32 of the hollow molded article manufacturing apparatus 1 of the present invention, one or more cooling fluids provided in the core The jet port 52 and one or more cooling fluid suction ports 54 formed in the core 32 to suck the cooling fluid jetted from the cooling fluid jet port 52.

That is, since the injected raw material 14 passes through the core, the cooling fluid, that is, the cooling water W is ejected to the hollow portion 12 through the ejection opening 52, so that the hollow portion is cooled very quickly, and the ejected cooling water is further increased. (W) is removed by suction at the suction port 54 adjacent to the jet port.

In addition, since the cooling fluid jet and suction are repeatedly performed in the hollow part of the molded product passing through the core, the cooling fluid jet and suction are continuously performed in the hollow part where the raw material is molded while passing through the core.

5 to 7, the core 32 may further include a groove 56 formed around the cooling fluid jet port and the cooling fluid suction port to facilitate the diffusion and suction of the cooling fluid.

Therefore, as shown in FIG. 8, the cooling fluid sprayed through the cooling fluid jet port 52, that is, the cooling water W, is in close contact with the hollow part surrounding the core and diffuses from the groove part 56, and then the suction part 54 side groove part. At 56, the cooling water is sucked wide to facilitate the treatment.

In this case, when the hollow molding 10 is a hollow panel, the hollow part 12 is generally rectangular, and thus, the cores 32 provided in the die unit 30 are tetrahedrons, and thus, as shown in FIGS. 5 to 7, The cooling fluid jet port 52 and the cooling fluid inlet port 54 of the hollow part cooling means 50 of the present invention are preferably arranged alternately at regular intervals on the core slope.

On the other hand, as shown in Figures 4 and 6,7, the cooling fluid jet port 52 and the cooling fluid inlet port 54 provided in the core 32, the cooling fluid supply passage provided in the core 32 And 34 and in communication with the cooling fluid suction passage 36.

For example, the connecting passages 34b and 36b which are spaced apart from each other inside the core 32 to process the main passages 34a and 36a in the longitudinal direction and communicate with the main passages on the surface of the core slope, respectively. ), The jet port 52 and the suction port 54 of the hollow part cooling means are formed at the end thereof, and the groove part 56 is formed on the outer surface of the core on which the jet port and the suction port are formed.

Then, when the initial portion for the processing of the longitudinal main passage (34a, 36b) of the core is sealed, and the cooling fluid supply pipe 40 and the cooling fluid suction pipe (42) to the main passage (34a, 36b), respectively, A series of operations of supply of cooling fluid-> blowout of the hollow-> suction of the cooling fluid-> discharge of the suction pipe is implemented, and cooling of the hollow part of the molding to be formed through the core of the die unit is continuously performed.

At this time, the main passages (34a) and (36b) of the cooling fluid supply and suction passage 34 provided in each of the cores is actually a bracket formed in front of connecting the main body (30a) and the core of the die unit 30 ( 38 is connected, and the cooling fluid supply pipe 40 and the cooling fluid suction pipe 42 which are assembled to the die unit body through the cooling fluid passage 44 formed in the bracket are connected to each other.

For example, as shown in FIG. 4, when six cores 32 in two stages are arranged inside the main body of the die unit 30, the cooling fluid suction pipes 42 are connected to the main passages of the respective core cooling fluid suction passages. The cooling fluid supply passage of the core 32 which connects 36a) with the bracket passage 44 and is connected to each other as the bracket 38 provided with the cooling fluid passage 44 in the cooling fluid supply pipe 40 on both sides of the die unit. In connection with the main passage 34a of (34), a thin plate bracket 38 'having no passage 44 in the core unrelated to the cooling fluid flow is connected to the die unit body.

Of course, the core and the cooling fluid supply and suction passage and the bracket connection configuration shown in Figure 4 is only one embodiment, of course, can be configured in other forms of connection.

At this time, the cooling fluid jet port 52 and the suction port 54 and the cooling fluid supply passage (34-34a, 34b) and the cooling fluid suction passage (36-36a, 36b) as shown in Figures 5 and 6 do not interfere with each other It is necessary to adjust its position so that it does not.

However, although the groove portion 56 is enlarged in the drawing, in practice, it is preferable not to interfere with the passage of the molded hollow portion 12 that passes through the core to form a very narrow width.

On the other hand, in the cooling fluid, that is, the cooling water (W), a water-soluble lubricating liquid, for example, an emulsion-type known water-soluble lubricating liquid is contained in the cooling water to spout the molded product hollow part 12 so as to smoothly pass the core of the molding. When passing through the surface of the core 32, the hollow part 12 will allow the core to pass easily.

Therefore, when the cooling water or the cooling water and the water-soluble lubricating liquid contained in the present invention are sprayed on the molding hollow part 12, the cooling of the hollow part as well as the passage of the core 32 of the molding hollow part will be smooth.

Referring to the manufacturing steps using the blow molding apparatus of the present invention described so far, as shown in Figure 2, the raw material 14 is introduced into the main body 30a of the die unit 30 using the feeder 16, and die Forming a molding 10 through the core 32 of the unit 30 to form the hollow part 12, and cooling the cooling fluid through the hollow part cooling means 50 provided in the core 32. And ejecting the molded hollow part 12 to cool the hollow part simultaneously with molding the molded part.

Therefore, in the hollow molding manufacturing process of the present invention, since the cooling of the molding hollow portion 12, which is a problem in the production of the existing hollow molding, is implemented through a separate cooling means, the high temperature raw material to the core by smooth cooling of the hollow portion Formation of the hollow portion 12 to pass through is quickly formed and no phenomena such as depression occur, so that a series of molding steps of inputting and molding the raw material and forming and extruding the hollow portion can be performed quickly.

As a result, the present invention is to improve the production productivity of the hollow molding 10, in particular the hollow panel.

In particular, in the manufacturing step of the hollow molding of the present invention, the cooling fluid of the cooling water or the cooling water containing the water-soluble lubricating oil is injected into the molding hollow through the cooling fluid jet port 52 of the hollow cooling means 50 provided in the core. Since the cooling fluid sprayed through the cooling fluid suction inlet 54 provided in the core is sucked and treated, the cooling fluid, that is, the cooling water prevents single-sided cooling or accumulation of the cooling fluid due to the excessive flow of the cooling fluid. will be.

In addition, the molding 10 including the hollow portion cooling step to quickly form the hollow portion 12 while maintaining the mold is passed through the die unit 30 to form the hollow portion to form a molded portion sizing unit ( 70) to maintain the shape of the molding.

While the invention has been shown and described in connection with specific embodiments so far, it will be appreciated that the invention can be varied and modified without departing from the spirit or scope of the invention as set forth in the claims below. It will be appreciated that those skilled in the art can easily know.

1 is a schematic diagram illustrating a problem in manufacturing a conventional hollow panel

Figure 2 is a block diagram showing the overall configuration of the apparatus for manufacturing a blow molding according to the present invention

3 is a perspective view of a die unit in the inventive device of FIG.

4 is a front configuration diagram of FIG.

5 is a perspective view showing a core provided in the die unit of the present invention of FIG.

6 is a side configuration diagram of FIG.

7 is a front configuration diagram of FIG.

Figure 8 is a state diagram showing a cooling state of the molding hollow portion passing through the core of the die unit of the present invention

Explanation of symbols on the main parts of the drawings

1 .... blow molding apparatus 10 .... hollow molding

12 .... hollow part 14 .... Raw material

16 .... Raw material feeder 18 .... Mold feed roll

20 .... Cutter 30 .... Die Unit

32 .... Core 34 .... Cooling fluid supply passage

36 .... Cooling fluid suction passage 38,38 '.... Bracket

40 .... cooling fluid supply pipe 42 .... cooling fluid suction line

44 .... Cooling fluid passage 50 .... Hollow cooling means

52 .... Cooling fluid outlet 54 .... Cooling fluid inlet

56 .... Groove 70 .... Sizing Unit

74 .... hollow plate 78 .... sizing body

Claims (14)

In the apparatus (1) for producing a hollow molding (10) having a hollow portion 12 therein, A die unit 30 which is molded while the injected molding material 14 is extruded and has one or more cores 32 for forming the hollow part 12 of the molding; And, Hollow part cooling means (50) provided in the core (32) of the die unit (30) and provided to cool the molding hollow part (12) formed while passing through the core with a cooling fluid; Consists of including The hollow part cooling means (50) provided in the core, the hollow molded product manufacturing apparatus including at least one cooling fluid jet port (52) provided in the core. The method of claim 1, A raw material feeder 16 which is connected to supply and feed raw materials to the inlet side of the die unit 30, and a sizing unit 70 which is provided to maintain the form of the molded product through vacuum suction at the exit side of the die unit 30; Blow molded article manufacturing apparatus comprising a. delete The method of claim 1, The hollow part cooling means 50 including the cooling fluid jet port 52 provided in the core 32 is one formed in the core 32 to suck the cooling fluid jetted from the cooling fluid jet port 52. Blow molding product manufacturing apparatus characterized in that it further comprises a cooling fluid inlet (54). The method of claim 4, wherein The core 32 is formed of a tetrahedron, The cooling fluid jet port 52 and the cooling fluid inlet port 54 is hollow molding product manufacturing apparatus, characterized in that arranged alternately in the longitudinal direction of the core on the core slope. The method according to claim 4 or 5, The interior of the core 32 is a blow molding apparatus, characterized in that the cooling fluid outlet and the cooling fluid supply passage 34 and the cooling fluid suction passage 36 in communication with the cooling fluid suction port is provided. The method according to claim 4 or 5, The core 32 further comprises a concave groove 56 formed across the cooling fluid jet port and the cooling fluid suction port to facilitate diffusion and suction of the cooling fluid. The method of claim 6, One or more cores 32 are connected to and fixed to the main body 30a of the die unit 30 through a bracket, and the cooling fluid supply passage 34 and the cooling fluid suction passage 36 provided in the core are attached to the bracket. And a cooling fluid passageway (44) communicating with and connected to an external cooling fluid supply pipe (40) and a cooling fluid suction pipe (42) through a die unit body. The method of claim 8, wherein the bracket 38, the cooling fluid passageway 44 is formed in a streamlined shape to smooth the molding of the raw material to be extruded, the bracket 38 'is not formed of a cooling fluid passageway is formed of a plate material Blow molding product manufacturing apparatus characterized in that. The method of claim 2, The sizing unit 70 is disposed on the outer side of the molding 10 having the hollow part 12 passing through the core, and the hollow plate 74 and the hollow plate having the holes 72 are disposed therein, and the hollow tube ( The apparatus for manufacturing a hollow molding comprising a sizing body 78 to which 76 is connected. The method of claim 1, The cooling fluid is a hollow molding production apparatus, characterized in that provided with a cooling water or cooling water containing a lubricating material. Inserting the raw material into the die unit and passing the core of the die unit while extruding to form a hollow molding having a hollow portion; And, Cooling the hollow part simultaneously with molding the molded product by ejecting a cooling fluid into the hollow part of the molded part through the hollow part cooling means provided in the core; Consists of including The cooling fluid inlet of the cooling water or the cooling water containing the lubricating material is injected into the molding hollow through the cooling fluid ejection opening of the hollow cooling means provided in the core, and the cooling fluid inlet provided in the core is adjacent to the cooling fluid ejection opening. Hollow molding production method for the suction treatment of the cooling fluid ejected through. delete The method of claim 12, A hollow molded article manufacturing method characterized by passing the molded molding through the sizing unit while passing through the die unit to form a hollow portion.

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