JP2004154955A - Method and apparatus for demolding deep-draw molded container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for demolding a deep-draw molded container which can produce the container having an uneven shape on its side by a simple structure, and an apparatus for the method. <P>SOLUTION: An uneven shape 2b in a lateral direction is formed on the side of a lower part mold 2 becoming a mold for the deep-draw molded container. After a lower film 1 which is a packaging material for deep drawing is softened under heating to be pressed to the mold 2 under pressure, the mold 2 is moved downward to be separated in order to demold the molded container. At this time, the deep-draw molded container 1a is forcibly pushed up in the upward direction opposite to the mold separating direction by a forcible pushing-up means 5 to be demolded from the mold 2. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method and an apparatus for releasing a deep-drawing molding container in which a deep-drawing molding material is heated and softened, pressed against a molding die by pressing, and then released from the molding die.
[0002]
[Prior art]
Conventionally, molding and release of a deep drawing container have been performed as shown in FIGS.
[0003]
In the first step, as shown in FIG. 8, the lower mold 1 has started to rise with the lower film 1 on the container body side set on the upper mold 3 side.
[0004]
Next, in the second step, as shown in FIG. 9, the lower mold 2 is raised and is in contact with the upper mold 3, and the lower mold 2 is placed in the upper mold 3 and the lower mold 2. Compressed air is supplied from the exhaust communication pipe 2 a of the mold 2, and exhaust is performed from the exhaust communication pipe 3 a of the upper mold 3. At this time, the lower film 1 is pressed against the heating plate 4 and heated to be in a softened state.
[0005]
In the third step, as shown in FIG. 10, after the lower film 1 is sufficiently heated, compressed air is supplied into the upper mold 3 from the exhaust communication pipe 3a of the upper mold 3, and the softened lower film 1 is supplied. 1 is pressed into a lower mold 2 and molded. Evacuation or evacuation is performed from the exhaust communication pipe 2 a of the lower mold 2. Cooling water flows through the lower mold 2, and the formed lower film 1a is immediately cooled and solidified.
[0006]
In the fourth step, as shown in FIG. 11, after the molding is completed, the lower mold 2 starts descending, and the lower mold 2 is completely separated from the upper mold 3.
[0007]
[Problems to be solved by the invention]
However, conventionally, it has been difficult to form a concave and convex shape such as a rib in a lateral direction of a side surface of a molded container because mold release is difficult. This is because it is possible to heat and soften the wrapping material and press the mold against the irregularities such as ribs in the lateral direction of the mold, but when the mold is separated for mold release. In addition, the uneven shape of the molded container is caught by the uneven shape of the molding die, the film of the molded container body is pulled in the separating direction together with the mold, and the film gripped by the gripper comes off. This is because
[0008]
For this reason, as shown in FIG. 12, in the conventional container 10, the irregularities such as ribs designed for the purpose of reinforcing the tray are formed only in the vertical direction of the bottom surface 11 of the molding die or the side surface 12 on the molding side. I couldn't.
[0009]
A packaging container manufacturing apparatus that releases a packaging container while maintaining an upright surface provided with an undercut portion is disclosed in Patent Document 1.
[0010]
[Patent Document 1]
JP-A-6-219424
The technique disclosed in Patent Document 1 described above has a problem that it can deal only with a packaging container having a special shape, and has a complicated device configuration.
[0012]
The present invention is to solve such a problem. That is, an object of the present invention is to provide a method and an apparatus for releasing a deep drawn container having a simple configuration, which can produce a deep drawn container having an uneven shape on a side surface.
[0013]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, a method for releasing a deep-drawing molded container according to the present invention according to claim 1 provides a concave-convex shape in a lateral direction on an inner surface of a molding die of a container to be deep-drawn.
After softening the deep-drawing packaging material by heating and pressing it against the molding die by pressing and molding, when moving the molded container in the separating direction to release it from the molding die,
A position not to be molded, such as a flange portion of a container, is forcibly released by forcibly pushing up the molding die to a side opposite to the separating direction of the molding die.
[0014]
According to the second aspect of the present invention, the forcible push-up means includes a compression elastic body arranged in the molding die so as to be compressible in a direction away from the molding die, and receives a compressive force when the compression elastic body is contracted. And a forced-release part, which is configured to release the compression elastic body with the movement of the molding die at the time of mold release, protrude in a direction opposite to the moving direction of the molding die, and to be capable of pushing up the molded container. It is characterized by becoming.
[0015]
The invention according to claim 3 is characterized in that the deep-drawing packaging material is made of a semi-rigid or rigid film.
[0016]
The invention according to claim 4 is characterized in that the deep-drawing packaging material is made of polypropylene as a base material.
[0017]
The invention according to claim 5 is characterized in that the deep-drawing packaging material has a heat-resistant resin layer disposed on the surface of a polypropylene base material.
[0018]
The invention according to claim 6 is characterized in that the heat resistant resin layer constituting the deep drawing packaging material is a polyamide resin.
[0019]
In the invention according to claim 7, the first mold (2) serving as a molding die of the container to be deep drawn and the second mold (3) on the opening side of the container are formed by the deep drawing molding material ( The first mold (2) is movable in the clamping direction, with the first mold (2) disposed opposite to both sides so as to be able to clamp the first mold.
The second mold (3) and the first mold (2) are provided with contact portions that abut against each other to partition the molding chamber inside the second mold (3) and the first mold (2).
At a contact portion of the first mold (2), a position not to be molded, such as a flange portion of the container, is pushed up in a direction opposite to a separating direction of the first mold (2) to be forcibly separated. It is provided with a forced push-up means (5) for molding.
The forcible pushing-up means (5) arranges a compression elastic body (51) compressible in the moving direction of the first mold (2) in a contact portion of the first mold (2), and comprises a compression elastic body (51). ) Receives a compressive force when retracted, and has a forced release part (50) that can protrude from the contact part and push up the container when the compression elastic body (51) is released,
Forming an uneven shape (2b) in the lateral direction on the inner surface of the first mold (2);
When the deep drawing packaging material (1) is heated and softened and pressed against the first mold (2) under pressure to form the first mold (2), the first mold (2) is moved in the separating direction to release the mold. The container (1a) formed by deep drawing is forcibly pushed up to the side opposite to the separating direction by the forcible pushing-up means (5), and the end is pressed toward the second mold (3), whereby the container It is characterized in that the concave and convex shape of (1a) is released without being caught by the first mold (2).
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings.
1 to 5 are cross-sectional configuration diagrams illustrating steps of a method for releasing a deep drawn container according to an embodiment of the present invention. FIG. 1 is a view showing a process in a state where a lower film to be a container main body is set on an upper mold side and a lower mold starts to rise, and FIG. 2 is a diagram showing compressed air in the upper and lower molds. FIG. 3 is a diagram showing a process in which compressed air is introduced and exhausting or evacuation is performed, and FIG. 4 is a diagram showing a process in which the lower mold starts descending. FIG. 5 is a diagram showing a state where the lower mold is separated from the upper mold.
[0021]
The forming apparatus for a deep drawing container is provided with an upper die (second die) 3 and a lower die (first die) 2 vertically above and below a lower film (packaging material for deep drawing) 1. ing. In the present embodiment, the lower mold 2 can be moved up and down in the vertical direction, and when the lower mold 2 rises until it comes into contact with the upper mold 3, the lower film is moved by the upper mold 3 and the lower mold 2. Hold 1. Although not shown, grippers for firmly holding the lower film 1 are arranged on both sides of the upper mold 3 and the lower mold 2.
[0022]
In the present embodiment, the upper mold 3 and the lower mold 2 are arranged such that molding chambers are divided into right and left. For this reason, a contact portion is provided at the center of the upper mold 3 and the lower mold 2 to abut each other in order to partition the left and right molding chambers.
[0023]
A heating plate 4 is arranged in the upper mold 3 so as to face the lower film 1, and heats the lower film 1 sandwiched between the upper mold 3 and the lower mold 2.
[0024]
Further, an exhaust communication pipe 3a is formed in the upper mold 3 and an exhaust communication pipe 2a is formed in the lower mold 2 so as to supply exhaust gas or compressed air in accordance with a molding process. Such a configuration is the same as that of the conventional molding apparatus.
[0025]
The present invention is different from the conventional device in that the forced pushing-up means 5 is provided at the contact portion of the lower mold 2. As shown in FIG. 6, the forcible push-up means 5 includes a compression spring (compression elastic body) 51 disposed in a vertical direction in a contact portion of the lower mold 2, and a forcible release portion provided above the compression spring 51. 50 are provided. When the compression spring 51 is not compressed, the forcible mold release portion 50 is disposed such that its tip protrudes from an opening formed on the upper surface of the contact portion of the lower mold 2. Then, when the lower mold 2 is in contact with the upper mold 3, the tip of the forcible release part 50 is pressed, the compression spring 51 is compressed, and is pushed down to the upper surface of the lower mold 2.
[0026]
In the present embodiment, the forcible push-up means 5 is arranged only at the center of the lower mold 2, but the present invention is not limited to this. It is, of course, possible to provide a plurality of portions in the lower mold 2 according to the position, shape, etc., at which the uneven shape of the container is arranged.
[0027]
Further, in the present invention, as shown in FIG. 7, the lower mold 2 has an uneven surface 2b formed in the lateral direction on the inner surface. In the present embodiment, the lateral lateral unevenness 2b is formed by providing a row of semicircular cross-sections in one row in the horizontal direction, but the present invention is not limited to this. Needless to say, it may be provided.
[0028]
According to the present invention, with such a configuration, a laterally uneven shape 2b is provided on the side surface of a lower mold 2 which is a forming die of a container to be deep drawn, and the lower film 1 as a deep drawing packaging material is heated and softened. After being pressed against the lower mold 2 by pressurization, when the lower mold 2 is moved downward to separate the mold 1 from the lower mold 2, the deeply drawn container 1 a is forcibly forced by the forcible push-up means 5. The mold is lifted up in a direction opposite to the separating direction (upward) to release the mold.
[0029]
The method of releasing the deep drawn container of the present invention will be described in detail with reference to FIGS.
[0030]
In the first step, as shown in FIG. 1, the lower mold 1 has started to ascend with the lower film 1 serving as the container main body set on the upper mold 3 side. At this time, the upper part of the forcible release part 50 of the forcible lifting means 5 is in an open state, and the compression spring 51 is in a state of being protruded without being compressed.
[0031]
Next, in the second step, as shown in FIG. 2, the lower mold 2 is raised and is in a sealed state in contact with the upper mold 3, and the inside of the upper mold 3 and the lower mold 2 is Then, compressed air is supplied from the exhaust communication pipe 2a of the lower mold 2, and exhaust is performed from the exhaust communication pipe 3a of the upper mold 3. At this time, the lower film 1 is pressed against the heating plate 4 and heated to be in a softened state. The forced release part 50 of the forced push-up means 5 is pressed against the contact part of the upper mold 3 and is housed in the lower mold 2.
[0032]
In the third step, as shown in FIG. 3, after the lower film 1 is sufficiently heated, compressed air is supplied into the upper mold 3 from the exhaust communication pipe 3a of the upper mold 3, and the softened lower film 3 is supplied. 1 is pressed against the lower mold 2 and molded. Evacuation or evacuation is performed from the exhaust communication pipe 2 a of the lower mold 2. Cooling water flows through the lower mold 2, and the formed lower film (container body) 1 is immediately cooled and solidified. Also at this time, the forced release part 50 of the forced push-up means 5 is in contact with the upper mold 3 and is housed in the lower mold 2.
[0033]
In the fourth step, as shown in FIG. 4, after the molding is completed, the lower mold 2 starts descending. When the mold was closed, the compression spring 51 was retracted and housed in the mold 52. However, as the lower mold 2 started to descend, the contact between the lower mold 2 and the upper mold 3 contacted. The compression spring 51 starts to expand, and the forced release part 50 starts to gradually protrude from the contact part of the lower mold 2. As a result, the formed lower film (container main body) 1a is pushed up from the contact portion of the lower mold 2 and pressed toward the upper mold 3, so that the lower film 1a that has been forcibly formed is pressed into the lower mold. The mold is separated from the side lateral unevenness shape 2b of the mold 2 by releasing the mold.
[0034]
In the fifth step, the lower mold 2 is completely separated from the upper mold 3 as shown in FIG. At this time, the forcible push-up means 5 is completely separated from the formed lower film (container main body) 1a, the compression spring 51 is not compressed at all, and the forcible release part 50 is completely protruded. Return.
[0035]
The lower film 1 serving as the container body of the deep-drawing molded container can be selected from various deep-drawing packaging materials depending on the application, but a semi-rigid or rigid film is preferable from the viewpoint of moldability. In the case where heat treatment is performed after vacuum packaging, it is necessary to have heat resistance. Hereinafter, specific examples of the deep-drawing packaging material used as a heat-resistant film will be described.
[0036]
When the oxygen barrier property is not required, it is preferable to be composed of polypropylene alone. When oxygen barrier properties are required (in the case of retort treatment), it is preferable to form three layers of an outer layer, an intermediate layer, and a seal layer, each of which is made of polypropylene, EVOH, and polypropylene. In the case of boil heating, steam heating, or the like, particularly when oxygen barrier properties are not required, there is no intermediate layer, and the outer layer and the seal layer are preferably made of polypropylene and ultra-low density polyethylene, respectively.
[0037]
As described above, it is preferable to appropriately select the deep-drawing packaging material in accordance with the storage stability and the heat treatment method of the product to be vacuum-packaged. However, in the case of a heat-resistant film, it is most common to use polypropylene as the base material in consideration of moldability, cost, and versatility.
[0038]
In addition, after the container body is distributed in a frozen state, the buyer may cook with a boiling or microwave oven at the time of use. In this case, it is necessary to use a material (for example, polypropylene or the like) having cold resistance such as pinhole resistance and crack resistance during freezing.
[0039]
In the above-described example, the number of layers is two or three. However, the number of layers may be four or more depending on various conditions (heating conditions or cooling conditions) of the manufacturing process or conditions such as complexity of the shape. Of course. As an example of the four layers, for example, a configuration of polypropylene / polypropylene / EVOH / polyamide is used.
[0040]
In the present invention, since the uneven shape 2b can be formed on the side surface, the product shape can be a shape having complicated complicated unevenness. For example, three-dimensional shapes such as characters and character designs. In particular, when grooves and ribs such as irregularities are formed, it is difficult to mold the conventional materials unless they are larger than about 5 mm. Since it is possible to mold even grooves and ribs such as those described above, it is possible to mold a precise shape not only on the bottom surface but also on the side surfaces, so that it can be molded into any shape.
[0041]
【The invention's effect】
As described above, according to the present invention as set forth in claim 1, a laterally uneven shape is provided on the inner surface of the molding die of the container to be deep drawn, and the deep drawing packaging material is heated and softened. After pressing and molding against the molding die by pressing, when moving the molded container in the separating direction to release it from the molding die, the position not to be molded, such as the flange portion of the container, etc. By the forced push-up means, the molding die is pushed up to the side opposite to the separating direction to forcibly release the mold, so that when the molding die is separated for the release, the molded container is removed. The mold can be released without being caught by the uneven shape of the molding die. For this reason, it is possible to form the uneven shape such as the ribs in the lateral lateral direction, which has been difficult in the related art, so that the design of the molded container is remarkably improved, and it is possible to urge consumers to purchase.
[0042]
According to the second aspect of the present invention, the forcible push-up means includes a compression elastic body disposed in the molding die so as to be compressible in a direction away from the molding die, and a compression force when the compression elastic body is retracted. And receiving means for releasing the container when the mold is released, and comprising a push-up means disposed so as to be able to project in the direction opposite to the moving direction of the molding die when the compression elastic body is released. Therefore, a very simple configuration can be achieved.
[0043]
According to the third aspect of the present invention, since the deep drawing packaging material is a semi-rigid or hard film, it can be formed into a more complicated shape.
[0044]
According to the fourth aspect of the present invention, since the deep drawing packaging material is made of polypropylene as a base material, it is easy to form an uneven shape.
[0045]
According to the present invention as set forth in claim 5, since the deep-drawing packaging material has a heat-resistant resin layer disposed on the surface of the polypropylene base material, the melting point and the softening point are increased, so that high-temperature heating becomes possible. In particular, the shape of the container body can be formed in a complicated shape.
[0046]
According to the sixth aspect of the present invention, since the heat-resistant resin layer constituting the deep-drawing packaging material is made of a polyamide resin, a container can be more suitably formed.
[0047]
According to the present invention, the deep drawing packaging material (1) is heated and softened and pressed against the first mold (2) by pressing, and then the first mold (2) is released. When moving in the separating direction to form the mold, the deep drawing container (1a) is forcibly pushed up to the side opposite to the separating direction by the forcible pushing up means (5), and the end is moved to the second mold (3). Since it can be held down, it can be effectively released.
[Brief description of the drawings]
FIG. 1 is a cross-sectional configuration diagram illustrating a process of a method for releasing a deep-drawing molded container according to an embodiment of the present invention, in which a bottom film on a container body side is set on a molding upper mold side; It is a figure which shows the process which shows the state in which the lower metal mold | die started rising.
FIG. 2 is a cross-sectional configuration diagram illustrating steps of a method for releasing a deep-drawing molded container according to an embodiment of the present invention, in which compressed air is introduced into an upper and lower mold and exhausted. FIG.
FIG. 3 is a cross-sectional configuration diagram illustrating a process of a mold release method for a deep drawing container according to an embodiment of the present invention, and is a diagram illustrating a process of introducing compressed air and performing exhaust or evacuation.
FIG. 4 is a cross-sectional configuration diagram illustrating steps of a method of releasing a deep-drawing molded container according to an embodiment of the present invention, and is a diagram illustrating a state where a lower molding die has started descending.
FIG. 5 is a cross-sectional configuration diagram illustrating steps of a method of releasing a deep-drawing molded container according to an embodiment of the present invention, and is a diagram illustrating a state in which a lower molding die is separated from an upper die.
FIG. 6 is an enlarged configuration diagram of a forced push-up unit.
FIG. 7 is a view showing a laterally uneven shape of a molding die.
FIG. 8 is a cross-sectional configuration diagram illustrating a process of a conventional method of releasing a deep drawing container from a mold, in which a lower molding die is raised in a state where a bottom film on a container body side is set on an upper molding die side. FIG. 7 is a view showing a step of showing a state in which is started.
FIG. 9 is a view showing a process in which compressed air is introduced into the upper and lower molds and exhausted.
FIG. 10 is a view showing a step of introducing compressed air and performing exhaust or evacuation.
FIG. 11 is a view showing a state where a lower molding die is separated from an upper molding die.
FIG. 12 is a perspective view in which a concavo-convex shape such as a conventional rib is formed in a vertical direction on a side surface and a bottom surface of a deep drawing container.
[Explanation of symbols]
1 lower film (forming material for deep drawing)
1a Molded lower film (container, container body)
2 Lower mold (molding mold, 1st mold)
2a Exhaust communication pipe 2b Side recess 3 Upper mold (second mold)
3a Exhaust communication pipe 4 Heating plate 5 Forced push-up means 50 Forced release part (push-up means)
51 Compression spring (compression elastic body)

Claims (7)

Providing lateral irregularities on the inner surface of the molding die of the container to be deep drawn,
After softening the deep-drawing packaging material by heating and pressing it against the molding die by pressing and molding, when moving the molded container in the separating direction to release it from the molding die,
A deep drawing wherein a position not to be molded, such as a flange portion of a container, is forcibly lifted up by a forcible pushing up means in a direction opposite to a separating direction of the molding die so as to be forcibly released. Mold release method. The forcible pushing-up means is provided within the molding die, a compression elastic body arranged so as to be compressible in a direction away from the molding die, and receives a compressive force when the compression elastic body is retracted. The compression elastic body is released with the movement of the mold, and is protruded in a direction opposite to the moving direction of the molding die, and is provided with a forced mold release portion arranged so as to be able to push up the molded container. Item 4. A method for releasing a deep drawn container according to Item 1. 3. The method according to claim 1, wherein the deep-drawing packaging material is a semi-rigid or hard film. The method according to claim 3, wherein the deep-drawing packaging material is made of polypropylene as a base material. 5. The method according to claim 4, wherein the deep drawing packaging material comprises a heat-resistant resin layer disposed on a surface of a polypropylene base material. The method for releasing a deep-drawn container according to claim 5, wherein the heat-resistant resin layer constituting the deep-drawing packaging material is a polyamide resin. A first mold (2) serving as a mold for a container to be deep drawn and a second mold (3) on the opening side of the container can be sandwiched by the deep drawing material (1). The first mold (2) is disposed opposite to both sides thereof, and is movable in the clamping direction.
The second mold (3) and the first mold (2) are provided with contact portions that abut against each other to partition the molding chamber inside thereof.
At a contact portion of the first mold (2), a position not to be molded, such as a flange portion of the container, is pushed up in a direction opposite to a separating direction of the first mold (2) to be forcibly separated. It is provided with a forced push-up means (5) for molding.
The forcible pushing-up means (5) arranges a compression elastic body (51) compressible in the moving direction of the first mold (2) in a contact portion of the first mold (2), and comprises a compression elastic body (51). ) Is subjected to a compressive force when retracted, and includes a forcible mold release part (50) capable of pushing up a molded container protruding from the contact part when the compression elastic body (51) is released,
A lateral uneven shape (2b) is provided on the inner surface of the first mold (2),
When the deep drawing packaging material (1) is heated and softened and pressed against the first mold (2) under pressure to form the first mold (2), the first mold (2) is moved in the separating direction to release the mold. Then, the compression elastic body (51) is released, and the container (1a) formed by deep drawing is forcibly pushed up to the side opposite to the separating direction by the forcible mold release part (50), thereby forming the second mold (3). The mold release device for a deep drawing container, wherein the concave and convex shape of the formed container (1a) is released without being caught by the first mold (2) by holding the container to the side.

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