KR20210048373A - Resin container manufacturing device and resin container manufacturing method using the same - Google Patents

Abstract

The present invention relates to an apparatus for manufacturing a resin container and a method for manufacturing the resin container using the same. More particularly, the apparatus comprises: a lower mold having a plurality of molding space portions therein; an upper mold for positioning a preform formed primarily in the molding space portions to open and close upper ends of the molding space portions; a blower part for forming the resin container by supplying gas to a central part of the preform located in the molding space portions and extending the same to an inner peripheral surface and lower side of the molding space portions; and a pressing part for increasing the expansion force and support force of the preform expanded by the blower part. According to the present invention, when blowing, it is possible to improve the lower expansion force of the preform, and increase the support force of the lower part, thereby being able to mold the resin container with ecozen, a bioplastic with strong viscosity and rigidity.

Description

Resin container manufacturing device and resin container manufacturing method using the same}

The present invention relates to a container manufacturing apparatus and manufacturing method, and more particularly, to prevent and minimize the occurrence of damage and defects due to thinner thickness when expanding by easily expanding a high-viscosity and high-strength material to the lower side and supporting the lower end. It relates to a resin container manufacturing apparatus capable of improving work efficiency and a resin container manufacturing method using the same.

In general, a transparent or opaque packaging container manufactured using synthetic resin is formed by extrusion molding at a temperature and pressure set by a heating type molding machine to form a preform, and then supplying a gas to expand the container to form the resin container.

As disclosed in Korean Patent Registration No. 10-0979862, such a conventional molding machine extrudes perison, which is a cylindrical molten resin by an extruder in a normal direct blow molding method, and this perison is divided into two divided molds for blow molding. At the bottom of the mold, the bottom of the molten resin is cut with a cutting edge placed in the pinch-off portion of the cavity of the split mold at the bottom of the mold and heat-sealed, and the top is melted in a cylindrical shape with a Perison cutter. By cutting the upper part of the resin, a perison of a bottomed cylindrical body is formed, and then blow air is blown into the perison by an air nozzle inserted from the top of the split mold to manufacture a blow molding container.

However, conventionally, since the preform is heated to the same temperature, the temperature of the gripping portion of the preform is different from the temperature of the rest of the container, so that it is difficult to produce a high-quality container during the manufacturing process of the blower container.

Recently, a method of manufacturing a container using eco-friendly resin has been proposed due to environmental problems of resin materials, and a technology for manufacturing a container using ecozen, a developed bioplastic, has been proposed. .

However, ecogen, which is a bioplastic, has high viscosity and high strength, and when using a conventional PET container molding machine, it is not molded to a uniform thickness upon expansion, and in particular, there is a problem that a defect occurs due to a burst of the lower end.

Accordingly, there is an urgent need to develop a technology capable of manufacturing a container using an eco-friendly resin material.

Accordingly, the present invention was conceived to solve the above problems, the lower mold having a plurality of molding spaces therein, and the upper part for placing the preform primarily formed to open and close the upper end of the molding space part as the molding space part. The mold, a blower part for molding a resin container by supplying gas to the central part of the preform located in the molding space part and extending it downwardly to the inner circumferential surface of the molding space part, and increasing the expansion and support power of the preform extended by the blower part. A resin container manufacturing apparatus capable of molding a resin container from ecozen, a highly viscous and hard bioplastic, by improving the lower expansion power of the blower and the preform, including the pressurization part for making it, and increasing the supporting power of the lower part. It is an object to provide a method for manufacturing a resin container using this.

The present invention for achieving the above object is a lower mold having a plurality of molding spaces therein, an upper mold for positioning the preform primarily formed to open and close the upper end of the molding space as a molding space, and located in the molding space And a blower part for forming a resin container by supplying gas to the central part of the formed preform to increase the inner circumferential surface and the lower side of the molding space part, and a pressurizing part for increasing the expansion and support power of the preform extended by the blower part. .

Preferably, the lower mold includes a lower base mold forming an intermediate portion of the forming space portion therein, and a lower forming piece forming a lower end portion of the forming space portion.

In addition, the upper mold includes an upper base mold having an installation hole corresponding to the molding space part, an upper molding piece installed in the installation hole to open and close the upper part of the molding space part, and attaching the preform to the lower end of the upper molding part. Holder for, including.

Further, the holder has a plurality of fingers, and grips the upper end of the preform on the outer peripheral surface of the lower end of the upper molding piece by a cylinder.

And the blower unit includes a gas supply passage provided inside the upper molding piece, a blower nozzle through which gas supplied through the gas supply passage is discharged, and a gas supply pump for supplying gas to the gas supply passage. .

In addition, the pressing unit, when gas is supplied by the blower unit, by pushing the expanding preform downward to expand, the expansion unit for increasing the expansion force, and the expansion unit by moving the lower molded piece upward And a support portion for maintaining the thickness of the lower end of the resin container to be molded by supporting the lower side of the preform that is expanded downwardly.

And the expansion unit, an expansion frame positioned to be spaced apart at a predetermined interval above the upper mold, an expansion guide hole formed in the inner center of the upper molding piece, and an expansion provided in the expansion frame so as to be movable along the expansion guide hole. It includes a pin, and an extension driving unit for elevating the extension pin by elevating the extension frame.

In addition, the expansion pin is formed with different diameters of the upper end and the lower end, the diameter of the lower end is formed smaller than the diameter of the upper end to form a pressure holding space between the expansion guide hole, and between the upper end and the expansion guide hole. An expansion packing is formed on the upper end to seal the gap.

In addition, the support part includes a support frame on which the lower molding piece is provided, and a support cylinder for elevating the support frame.

In addition, it further includes a guide portion for guiding the elevation of the expansion portion.

And the guide part includes a guide hole formed in the lower mold, a guide pin formed on the expansion frame to move along the guide hole, and a stopper provided on the support frame to limit the downward movement of the guide pin. do.

In addition, the stopper has a thread along the inner circumference, and is screwed into a stopper hole formed in the support frame to adjust the position, so that the lower moving distance of the guide pin can be adjusted.

And it further includes a second movement limiting unit for limiting the movement distance of the expansion frame descending by the expansion driving unit.

In addition, the second movement limiting unit has a seating space therein, a second movement limiting block provided in the upper mold, and the expansion having elasticity, located in the seating space of the second movement limiting block and descending. And a second stopper that contacts the frame and restricts its movement.

In addition, the second stopper has a restriction guide hole formed therein so that the guide pin is guided.

In addition, while the preform is positioned in the molding space part, the blower part is controlled to supply gas and at the same time, the expansion part is controlled to improve the expansion power of the preform, and when the expanded preform is adjacent to the lower molding piece, the support part It further includes a control unit for supporting the lower side by controlling the lower molded piece to move upward.

And the mold bonding step of coupling the upper mold to the lower mold so that the preform of any one of claims 1 to 9 is located in the molding space of the lower mold, and the resin container is molded by supplying the gas to the preform by the blower. A blower step, a molding reinforcement step in which the preform expanded by the expansion part is moved downward to assist expansion, and when the resin container is formed at the lower side, the resin container is supported upward to assist the formation of the lower end of the resin container, and And a container taking out step of taking out the resin container having the lower end molded through the molding reinforcing step.

In addition, the molding reinforcement step, in the blower step, a preform expansion step of expanding the preform downward by moving the expansion pin downward, and the lower end of the preform expanded by the blower part and the expansion pin on the lower molding piece. And a lower end supporting step of supporting and molding the lower end of the resin container by moving upward while maintaining the distance between the lower molded piece and the expansion pin when it touches.

As described above, according to the apparatus for manufacturing a resin container and a method for manufacturing a resin container using the same according to the present invention, when blown, the lower expansion force of the preform is improved, and the support force at the lower end is increased to increase the viscous and hard bioplastic Ecogen ( ecozen) is a very useful and effective invention that makes it possible to mold resin containers.

1 is a view showing a resin container manufacturing apparatus according to the present invention,
2 is a view showing an upper mold, a lower mold, and a blower according to the present invention,
3 is a view showing a pressing unit according to the present invention,
4 is a view showing a support according to the present invention,
5 is a view showing a state further provided with a guide portion and a second movement limiting portion according to the present invention,
6 is a view showing the operating state of the resin container manufacturing apparatus according to the present invention,
7 is a view showing a resin container manufacturing method according to the present invention,
8 is a view showing a molding reinforcement step according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE INVENTION The detailed description to be disclosed below together with the accompanying drawings is intended to describe exemplary embodiments of the present invention, and is not intended to represent the only embodiments in which the present invention may be practiced. The following detailed description includes specific details to provide a thorough understanding of the present invention. However, those of ordinary skill in the art to which the present invention pertains knows that the present invention may be practiced without these specific details.

In some cases, in order to avoid obscuring the concept of the present invention, well-known structures and devices may be omitted, or may be illustrated in a block diagram form centering on core functions of each structure and device.

Throughout the specification, when a part is said to "comprising or including" a certain component, it means that other components may be further included rather than excluding other components unless specifically stated to the contrary. do. In addition, the term "... unit" described in the specification means a unit that processes at least one function or operation. In addition, "a or an", "one", "the" and similar related words are different from the present specification in the context of describing the present invention (especially in the context of the following claims). Unless indicated or clearly contradicted by context, it may be used in the sense of including both the singular and the plural.

In describing the embodiments of the present invention, if it is determined that a detailed description of a known function or configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. In addition, terms to be described later are terms defined in consideration of functions in an embodiment of the present invention, which may vary according to the intention or custom of users or operators. Therefore, the definition should be made based on the contents throughout the present specification.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a view showing an apparatus for manufacturing a resin container according to the present invention, FIG. 2 is a view showing an upper mold, a lower mold, and a blower according to the present invention, and FIG. 3 is a view showing a pressing part according to the present invention. , Figure 4 is a view showing a support according to the present invention, Figure 5 is a view showing a state further provided with a guide portion and a second movement limiting portion according to the present invention, Figure 6 is a resin container manufacturing according to the present invention It is a view showing the operating state of the device, Figure 7 is a view showing a resin container manufacturing method according to the present invention, Figure 8 is a view showing the molding reinforcement step according to the present invention.

As shown in the drawing, the resin container manufacturing apparatus 10 includes a lower mold 100 and an upper mold 200, a blower unit 300, and a pressing unit 400.

The lower mold 100 has a plurality of molding spaces 102 formed therein.

And the upper mold 200 is provided to position the first molded preform 2 to open and close the upper end portion of the upper mold 200 into the forming space portion 102.

Here, the preform 2 is molded from the raw material melted in the previous step, and the raw material is injected and molded while the upper mold 200 is combined with the lower mold of the previous step.

The upper mold 200 on which the preform 2 is formed is separated by a cylinder to the upper side of the lower mold of the previous stage, rotated by a motor and moved to the upper side of the lower mold 100, and then moved to the upper side of the lower mold 100 by a cylinder. 100).

In addition, the blower part 300 is provided to form the resin container 1 by supplying gas to the center of the preform 2 located in the molding space part 102 and extending it to the inner circumferential surface and the lower side of the molding space part 102. .

The pressing unit 400 is provided to increase the expansion force and support force of the preform extended by the blower unit 300.

Looking at the operating state of the resin container manufacturing apparatus 10, gas is supplied by the blower unit 300 while the preform 2 is positioned in the molding space 102 to expand the preform 2 to expand the resin container. (1) is molded.

Here, when the preform 2 is expanded, the preform 2 is expanded downward by the pressing part 400, and the resin container 1 is molded by supporting the lower end of the expanded preform 2 to maintain the thickness. .

Accordingly, the defective rate of the resin container 1 can be prevented and minimized.

The raw material for molding the resin container 1 is ecozen, which can be naturally decomposed into bioplastics, and has high heat resistance, transparency, and durability.

Instead, when compared to PET, as the viscosity is strong, it is not easily stretched, so that the thickness cannot be uniformly formed during molding, and there are problems such as a hole in the lower end.

In the present invention, the resin container 1 can be uniformly and easily molded with ecozen by the pressing unit 400, so that an eco-friendly resin container can be produced.

For this, the lower mold 100 includes a lower base mold 110 and a lower mold piece 120 as shown in FIG. 2.

The lower base mold 110 forms an intermediate portion of the molding space portion 102 therein, and the lower molding piece 120 is provided to form the lower end portion of the molding space portion 102.

In other words, the lower molding piece 120 is provided to open and close the lower side of the molding space part 102, and when blow molding is performed by the blower part 300, the lower part of the molding space part 102 is opened. The internal gas is discharged, and before the molding is completed, the lower end of the molding space 102 is closed and the lower end of the resin container 1 is molded.

In addition, the upper mold 200 includes an upper base mold 210 and an upper molding piece 220 and a holder 230.

The upper base mold 210 is provided with an installation hole 212 corresponding to the molding space 102.

In addition, the upper molding piece 220 is installed in the installation hole 212 to open and close the upper end of the molding space portion 102, and is formed to protrude downward.

The holder 230 is provided to mount the preform 2 on the lower end of the upper molding piece 220, and grips the preform 2 molded in the previous step.

The holder 230 has a plurality of fingers, and the plurality of fingers are operably provided by a cylinder to hold the upper end of the preform 2 on the outer peripheral surface of the lower end of the upper molding piece 220.

In addition, the blower unit 300 includes a gas supply path 310, a blower nozzle 320, and a gas supply pump 330.

The gas supply path 310 is provided inside the upper molding piece 220.

In addition, the blower nozzle 320 is provided to discharge the gas supplied through the gas supply path 310.

The gas supply pump 330 is provided to supply gas to the gas supply path 310, and blow molding is performed by supplying gas to the preform 2 through the blower nozzle 320.

And, as shown in FIG. 3, the pressing part 400 includes an extension part 410 and a support part 420.

When the gas is supplied by the blower part 300, the expansion part 410 is provided to increase the expansion force by pushing the expanded preform 2 downward and expanding it.

In addition, the support part 420 moves the lower molding piece 120 upward to support the lower side of the preform 2 extended downward by the expansion part 410 to maintain the thickness of the lower end of the resin container 1 to be molded. Is equipped for.

First, the expansion unit 410 includes an expansion frame 412, an expansion guide hole 414, an expansion pin 416, and an expansion drive unit 418.

The expansion frame 412 is positioned above the upper mold 200 to be spaced apart at a predetermined interval.

And the expansion guide hole 414 is formed through a through hole in the inner center of the upper molding piece 220, and is partitioned with the gas supply path 310.

In other words, the expansion guide hole 414 is formed through a hole in the inner center of the upper molding piece 220, and the gas supply path 310 is formed to surround the outer circumference of the expansion guide hole 414.

The expansion pin 416 is provided on the expansion frame 412 so as to be movable along the expansion guide hole 414.

In addition, the extension driving unit 418 is provided to lift the extension pin 416 by elevating the extension frame 412.

Here, the expansion pin 416 is formed to have different diameters of the upper end 416a and the lower end 416b, and the diameter of the lower end 416b is formed smaller than the diameter of the upper end 416a.

Accordingly, a pressure holding space part 417 is formed between the expansion guide hole 414, and an expansion packing 419 is formed at the upper end to seal the space between the upper end part 416a and the expansion guide hole 414. do.

When gas is introduced by the blower unit 300, the pressure holding space unit 417 can prevent the pressure from being concentrated to the preform 2, thereby preventing damage to the lower side as the internal pressure is adjusted. .

This expansion packing 419 is preferably provided on the upper end 416a connected to the lower end 416b of the expansion pin 416.

And, as shown in Figure 4, the support 420 includes a support frame 422 and a support cylinder 424.

The support frame 422 is provided with a lower molding piece 120, and is provided to elevate the support cylinder 424.

And, as shown in Figure 5, further includes a guide portion 430 for guiding the elevation of the expansion portion 410.

The guide part 430 includes a guide hole 432, a guide pin 434 and a stopper 436.

The guide hole 432 is formed in the lower mold 100 and the upper mold 200.

In addition, the guide pin 434 is formed on the expansion frame 412 to move along the guide hole 432.

The stopper 436 is provided on the support frame 422 to limit the downward movement of the guide pin 434.

This stopper 436 is screwed into the stopper hole 438.

The stopper hole 438 has a thread along the inner circumference, is formed on the support frame 422, and adjusts the height of the upper end of the stopper 436 according to the screwed position, thereby reducing the downward moving distance of the guide pin 434. Limit.

Here, a guide seating portion 439 is further formed at a lower end of the guide pin 434 and an upper end of the stopper 436.

This guide seating portion 439 includes a guide seating groove 439a and a guide seating protrusion 439b, and a guide seating groove 439a in any one of the lower end of the guide pin 434 and the upper end of the stopper 436 Is formed, the guide seating protrusion 439b is formed on the other, so as to be mutually seated at the correct position.

And the pressing unit 400 further includes a second movement limiting unit 440.

The second movement limiting unit 440 limits the movement distance of the expansion frame 412 descending by the expansion driving unit 418.

The second movement limiting unit 440 includes a second movement limiting block 442 and a second stopper 444.

The second movement limiting block 442 has a seating space portion 443 therein, and is provided in the upper mold 200.

In addition, the second stopper 444 has elasticity, and is positioned in the seating space 443 of the second movement limiting block 442 to reach the descending expansion frame 412 to limit movement.

The second stopper 444 has a limit guide hole 445 formed therein so that the guide pin 434 is guided therein.

Accordingly, by limiting the moving distance of the extension part 410 together with the guide part 430, the lower part of the preform 2 extending downward is prevented from being damaged.

In addition, by supporting the lower end of the preform 2 extending downward by the support part 420, the defective rate of the resin container 1 can be prevented and minimized.

Here, the resin container manufacturing apparatus 10 further includes a control unit 500.

The control unit 500 controls the lower mold 100 and the upper mold 200, the blower unit 300 and the pressing unit 400.

According to this control unit 500, as shown in Fig. 6, while the preform 2 is positioned in the forming space unit 102, the blower unit 300 is controlled to supply gas and the expansion unit 410 Control to improve the expansion power of the preform.

When the expanded preform 2 is adjacent to the lower molding piece 120, the lower part can be supported by controlling the support part 420 to move the lower molding piece 120 upward by a certain distance and press it upward. It is possible to prevent damage to the lower end of the resin container (1).

Here, the lower part of the expansion pin 416 of the expansion part 410 and the lower molding piece 120 are spaced apart by the thickness of the bottom of the resin container 1 to be molded, and when the lower molding piece 120 is moved upward, The expansion pin 416 is also moved to the upper side to maintain the thickness of the bottom of the resin container 1, so that the lower end can be sturdyly molded.

In other words, the distance between the extension pin 416 and the lower molding piece 120 is maintained by contacting the guide pin 434 with the stopper 436, and when the lower molding piece 120 moves upward, the support frame 422 As it moves upward, the stopper 436 and the guide pin 434 move together.

In addition, as the extension frame 412 provided with the guide pin 434 is also moved together, the extension pin 416 is also moved while maintaining a distance with the lower molding piece 120.

As shown in FIG. 7, the method for manufacturing a resin container by the resin container manufacturing apparatus 10 is a mold bonding step (S10) and a blower step (S20), a molding reinforcing step (S30), and a container taking out step (S40). ).

In the mold coupling step (S10), the upper mold 200 is coupled to the lower mold 100 so that the preform 2 is positioned in the forming space 102 of the lower mold 100.

And in the blower step (S20), the resin container 1 is molded by supplying gas to the preform 2 by the blower unit 300.

The molding reinforcement step (S30) assists the expansion by moving the preform (2) expanded by the expansion part (410) downward during the blower step (S20), and when forming the lower side of the resin container (1), it is supported upward. Thus, it is molded by assisting in forming the lower end of the resin container 1.

In addition, in the container taking out step (S40), the resin container 1 having the lower end molded is taken out through the molding reinforcement step (S30).

In this container taking out step (S40), the upper mold 200 in which the resin container 1 is held is moved to another position and taken out.

Here, the molding reinforcement step (S30) includes a preform expansion step (S31) and a lower end support step (S32), as shown in FIG. 8.

In the preform expansion step (S31), in the blower step (S20), the expansion pin 416 is moved downward to expand the preform (2) downward.

And the lower part support step (S32) is when the lower part of the preform 2 extended by the blower part 300 and the expansion pin 416 touches the lower molding piece 120, the lower molding piece 120 and the expansion pin ( While maintaining the gap of 416), it is moved upward to support and mold the lower end of the resin container (1).

In this lower end support step (S32), as the expansion pins 416 and the lower molding piece 120 forming the lower end of the resin container 1 are moved upward together while maintaining a gap, the lower end is firmly molded. Let it.

10: resin container manufacturing apparatus 100: lower mold
110: lower base mold 120: lower molding piece
200: upper mold 210: upper base mold
220: upper molding piece 230: holder
300: blower part 310: gas supply path
320: blower nozzle 330: gas supply pump
400: pressurization part 410: expansion part
420: support part 430: guide part
440: second movement restriction unit

Claims (10)

A lower mold having a plurality of forming spaces therein;
An upper mold for positioning the preform, which is firstly molded to open and close the upper end of the molding space part, as a molding space part;
A blower unit for forming a resin container by supplying gas to the central portion of the preform located in the molding space and extending it to the inner peripheral surface and the lower side of the molding space; And
A resin container manufacturing apparatus comprising a; pressing unit for increasing the expansion force and support force of the preform extended by the blower unit. The method of claim 1, wherein the lower mold,
A lower base mold having an intermediate portion of the forming space portion formed therein; And
Resin container manufacturing apparatus comprising a; lower molding piece forming the lower end of the molding space part. The method of claim 2, wherein the upper mold,
An upper base mold having an installation hole corresponding to the forming space;
An upper molding piece installed in the installation hole to open and close an upper end of the molding space part; And
Resin container manufacturing apparatus comprising a; a holder for mounting the preform to the lower end of the upper molding piece. The method of claim 3, wherein the blower unit,
A gas supply path provided inside the upper molding piece;
A blower nozzle through which gas supplied through the gas supply path is discharged; And
Resin container manufacturing apparatus comprising a; gas supply pump for supplying gas to the gas supply path. The method of claim 4, wherein the pressing part,
When the gas is supplied by the blower unit, the expansion unit for increasing the expansion force by pushing the expanded preform downward; And
And a support portion for maintaining the thickness of the lower end portion of the resin container to be molded by moving the lower molded piece upward to support the lower side of the preform extended downward by the expansion portion. The method of claim 5, wherein the expansion unit,
An expansion frame positioned to be spaced apart at a predetermined interval above the upper mold;
An expansion guide hole formed through the inner center of the upper molding piece;
An expansion pin provided in the expansion frame to be movable along the expansion guide hole; And
Resin container manufacturing apparatus comprising; an expansion driving unit for lifting the expansion pin by lifting the expansion frame. The method of claim 5, wherein the support,
A support frame provided with the lower molding piece; And
Resin container manufacturing apparatus comprising a; support cylinder for elevating the support frame. The method of claim 7,
A resin container manufacturing apparatus further comprising a; guide portion for guiding the elevating of the expansion portion. The method of claim 8,
A resin container manufacturing apparatus further comprising a; second movement limiting unit for limiting the movement distance of the expansion frame descending by the expansion driving unit. A mold coupling step of coupling the upper mold to the lower mold so that the preform of any one of claims 1 to 9 is located in the forming space of the lower mold;
A blower step of forming a resin container by supplying gas to the preform by the blower unit;
In the blower step, a molding reinforcing step of moving the preform expanded by the expansion unit downward to assist expansion, and supporting the resin container upwardly when forming the lower side of the resin container to assist formation of the lower end of the resin container; And
A method for manufacturing a resin container comprising a; container taking out step of taking out the resin container in which the lower end is molded through the molding reinforcing step.

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