JP2002145215A - Deep drawing type packaging machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deep drawing type-packaging machine capable of relatively thickening a wall thickness of a bottom of a notch segment and further reducing a manufacturing cost. SOLUTION: As a forming device 10 for forming a notch against a lower film 2 intermittently transported, this device is made to have a structure in which there are provided an upper side box 11 and a lower side box 12, a male die 16 having an outer shape coinciding with an inner shape of a notch 4 is arranged in the upper side box in such a way that it can be ascended or descended, the lower side box can be ascended or descended, and compressed gas can be supplied in the lower side box. At a downstream side of this forming device are installed means for covering an upper film against the lower film; a seal means for sealing predetermined portions of the lower film and the upper film so as to sealingly close the notch; and a cutting means for cutting the predetermined locations of the lower film and the upper film to manufacture each of packaged items, thereby a deep drawing type packaging device is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deep drawing type packaging machine.

[0002]

2. Description of the Related Art An example of a conventional deep drawing type packaging machine is as follows.
It is as shown in FIG. That is, according to the manufacturing process, the lower film 2 continuously pulled out from the material roll 1 is transported in the horizontal direction. The lower film 2 is vacuum-suctioned by the molding device 3 arranged in the middle of the conveyance, and the concave portion 4 protruding downward is molded. Then, at a predetermined position on the downstream side of the molding device 3, an article to be packaged is automatically or manually supplied into the concave portion 4.

On the other hand, above the film transport line,
Another material roll 5 is installed, and this material roll 5
, The upper film 6 is continuously drawn out, and the pulled out upper film 6 is superimposed on the lower film 2 at a predetermined position on the downstream side of the supply point of the packaged object.

Further, a vacuum device 7 is disposed downstream of the polymerization point of the two films 2, 6. The vacuum device 7 sucks and removes the air in the concave portion 4 and seals the two films 2, 6. . Thereby, the article to be packaged is sealed in the recess 4 in a vacuum state. Thereafter, the sealing portions of the two films 2 and 6 are cut in the horizontal and vertical directions by the horizontal cutter device 8 and the vertical cutter device 9 to separately manufacture each vacuum package.

[0005] As shown in FIG.
It has an upper box 3a and a lower box 3b which are arranged vertically with the lower film 2 interposed therebetween. Then, in the lower box 3b, a female mold 3c processed into an inner shape corresponding to the outer shape of the concave portion 4 to be molded is arranged. An exhaust communication pipe 3d for connecting to suction means such as a vacuum pump is provided on the bottom surface of the lower box 3b.

On the other hand, a plug 3e which moves up and down relatively to the upper box 3a is provided in the upper box 3a.
It has. Furthermore, on the top surface of the upper box 3a,
An intake communication pipe 3f connected to a compressor or the like capable of supplying compressed air is provided.

Then, the lower box 3b moves up and down to sandwich the lower film 2 or move the upper and lower boxes 3b.
The lower film 2 is allowed to be conveyed away from a and 3b. Further, heating plates 3g and 3h are stored upstream of the female mold 3c and the plug 3e in each of the boxes 3a and 3b, so that the concave portion forming position of the lower film 2 is preliminarily heated.

In the molding apparatus 3 having such a configuration, first, the lower box 3b moves upward to sandwich the lower film 2. This heats the film portion where the upper and lower heating plates 3g and 3h face each other. In addition, this heated film part is the next or next cycle, the female mold 3c,
It is located between the plugs 3e.

Then, the plug 3e moves downward and pushes the lower film 2 into the female mold 3c. At this time, the compressed air is supplied into the upper box 3a to increase the pressure, and the pressure in the lower box 3b is reduced by vacuum suction. As a result, the lower film 2 comes into close contact with the inner peripheral surface of the female mold 3c, and is molded into the shape of the inner peripheral surface to form the concave portion 4.

[0010]

However, the above-described molding apparatus of the conventional deep drawing type packaging machine has the following problems. That is, as shown in FIG. 3, the shape of the concave portion 4 is such that the film thickness of the bottom portion 4a and the R portion 4b around the bottom portion becomes thin. This is because the film portion extends toward the periphery to be brought into close contact with the inner peripheral surface of the female mold 3d by suction in a state where the film portion is protruded downward to some extent by the plug 3e.

On the other hand, since the concave portion 4 is finally displayed as the bottom of the package, a certain degree of strength is required. Therefore, it is necessary to use a thick film as the lower film 2 in advance in consideration of the fact that the thickness of the bottom portion 4a of the concave portion 4 and the peripheral R portion 4b is reduced. Further, when the shape becomes complicated, the inner shape of the female mold 3c needs to be made to be such a complicated shape, and the processing of the female mold becomes complicated and expensive.

SUMMARY OF THE INVENTION The present invention has been made in view of the above background, and has as its object to solve the above-described problems and to make the bottom portion of the concave portion relatively thick. An object of the present invention is to provide a deep-drawing type packaging machine which can reduce manufacturing costs and can be easily manufactured by providing a molding device which does not require an expensive female mold.

[0013]

In order to achieve the above-mentioned object, a deep drawing type packaging machine according to the present invention comprises a molding device for molding a concave portion in a lower film which is intermittently conveyed, and a molding device for molding the concave portion. A means for covering an upper film with respect to the lower film in a state in which an object to be packaged is inserted in the recess, and sealing a predetermined portion of the lower film and the upper film with the lower film being inserted into the recess; It is assumed that a deep drawing type packaging apparatus is provided with sealing means for sealing the concave portion, and cutting means for cutting predetermined portions of the lower film and the upper film to manufacture individual packages. The molding device includes an upper box and a lower box, and a male mold having an outer shape corresponding to the inner shape of the recess is disposed in the upper box so as to be able to move up and down, and the lower box is provided. Is configured to be able to move up and down and to supply compressed gas into the lower box.

In the present invention, the lower film is first formed in a downwardly convex state while being in surface contact with the lower surface of the male mold.
At this time, there is no contact with the upper part of the outer periphery of the male mold. Then, by increasing the pressure in the lower box,
The film portion that is not in contact with the male mold is stretched and adheres to the upper part of the outer peripheral surface of the male mold, and a concave portion corresponding to the external shape of the male mold is formed.

At this time, the thickness of the film at each portion of the concave portion is relatively thick at the bottom portion, and thinned by extending the upper portion. Therefore, the strength of the bottom part is increased. as a result,
As the lower film, a thin film material can be used.

Preferably, a mechanism for forcibly exhausting the air in the upper box is provided. In this case, in addition to the pressure increase in the lower box described above, the suction in the upper box allows the lower film to smoothly adhere to the outer periphery of the male mold.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION A deep drawing type packaging machine according to the present invention comprises:
The basic structure can be the same as the conventional one shown in FIG. 1, and a molding device for forming the concave portion 4 at a predetermined position of the lower film 2 is different. Therefore, a molding device as a main part of the present invention will be described below.

FIG. 4 shows an embodiment of the molding apparatus 10. As shown in FIG.
Has an upper box 11 and a lower box 12 arranged vertically above and below the lower film 2. In the present embodiment, the lower box 12 can move up and down, and when the lower box 12 moves up, the lower film 2 can be held between the upper and lower boxes 11 and 12. An O-ring 13 is attached to the periphery of the upper surface (opening surface) of the lower box 12 to enhance the airtightness of the contact portion when the O-ring 13 is sandwiched.

The upper and lower boxes 11, 12 are
Upstream side (left side in the figure) along the transport direction of the lower film 2
And the molding chambers 11b and 12b on the downstream side (right side in the figure). The heating plates 14 and 1 are provided in the pressurizing chambers 11a and 12a on the upstream side, respectively.
5 are arranged. Thereby, the upper and lower boxes 1
When the lower film 2 is sandwiched between the film portions 1 and 12, the opposite film portions are heated by the heating plates 14 and 15 arranged above and below, so that the film portions are easily deformed. Up to this configuration, it is the same as the conventional molding apparatus.

Here, in the present invention, the male mold 16 is arranged in the molding chamber 11b of the upper box 11 on the lower surface of the support plate 16a which can move up and down. The outer shape of the male mold 16 matches the inner shape of the concave portion 4 formed in the lower film 2. Further, an exhaust communication pipe 17 communicating with the inside of the upper box 11 is provided on the top surface of the upper box 11.
The distal end of the exhaust communication pipe 17 is connected to a suction device such as a vacuum pump or a vacuum pump (not shown).

Thus, when the vacuum pump is operated, the air in the internal space of the upper box 11 is sucked and removed through the exhaust communication pipe 17 and the pressure is reduced. Note that an opening / closing valve or the like may be provided in the exhaust communication pipe 17 so that the vacuum pump is always operated during the packaging process, and switching control of “suction / stop” can be performed by opening / closing the opening / closing valve.

On the other hand, an intake communication pipe 18 communicating with the inside of the lower box 12 is connected to the bottom surface of the lower box 12, and a cylinder capable of supplying compressed air, A compressor is connected. This allows compressed air to be supplied from the compressor into the lower box 12 via the intake communication pipe 18.

Next, the operation of the molding apparatus 10 having the above configuration will be described. 5 and 6 show upper and lower boxes 11,
12 shows the side of the molding chambers 11b and 12b. In this example, a molding device 10 for forming three concave portions in a horizontal line in the lower film 2 is shown. Therefore, as shown in FIG.
6 are provided. Also, on the lower box 12 side,
A partition wall 19 is provided to divide three regions. The upper surface of the partition wall 19 is located on substantially the same plane as the upper surface of the lower box 12.

The lower film 2 is transported intermittently. Then, when the conveyance is temporarily stopped, the following processing is executed. First, as shown in FIG. 5 (a), the lower box 12 moves up and sandwiches the lower film 2 with the upper box 11. At this time, the upper surface of the partition wall 19 also contacts and supports the lower surface of the lower film 2. The film portions sandwiched and held in the molding chambers 11b and 12b are heated by a heating plate in the preceding process.

Next, as shown in FIG. 2B, the support plate 16a is moved downward. This support plate 16
The lower surface 16b of the male die 16 that moves downward together with the lower film a contacts the lower film 2 facing the lower die 2 and urges the lower film 2 downward. Then, the lower film 2 heated and softened becomes
It is pushed into the lower surface 16b of the male mold 16 and deformed into a downwardly convex state. At this time, as is apparent from the figure, although the lower film 2 is in surface contact with the lower surface 16b of the male mold 16,
The upper part is separated from the male mold 16.

Next, as shown in FIG. 6A, compressed air is supplied (pressurized air) into the lower box 12, and air in the upper box 11 is removed by suction (vacuum). Then, the lower film 2 receives an upward urging force by the action of the compressed air or the compressed air and the vacuum, and the predetermined film portion is further extended and adheres to the outer peripheral surface of the male mold 16. Thereby, the concave portion 4 having the inner shape corresponding to the outer shape of the male mold 16 is formed in the lower film 2.

Thereafter, the compressed air / vacuum processing is stopped. Then, the support plate 16a (male mold 16) is moved up and the lower box 12 is moved down. As a result, the recess 4 is formed in the lower film 2 as shown in FIG. Then, the lower film 2 is conveyed by one pitch, and the process proceeds to the molding process of the next concave portion 4. Thereafter, by repeatedly performing the above-described processing, three concave portions 4 are sequentially formed at a predetermined position of the lower film 2 in a horizontal line. Then, although not shown in the drawings, the article to be packaged is supplied into the recess 4 formed in this manner, and then the upper film is coated on the lower film 2 and the inside of the recess is vacuum-treated. By performing seal cutting, a deep drawing type package is manufactured. Note that the configuration shown in FIG. 1 can be applied to the apparatus for performing each process, and the configuration is the same as that of the related art.

According to this embodiment, first, the lower film 2 is
The film is brought into surface contact with the lower surface 16b of the male die 16, and then the film portion not in contact with the male die 16 is stretched and adheres above the outer peripheral surface of the male die 16. Therefore, as shown in FIG. 7, the thickness of the film of the concave portion 4 is relatively thick at the bottom portion 4a, and thinned by extending the upper portion 4c. Therefore, the strength of the bottom portion 4a and the R portion 4b at the periphery thereof increases. Even if the upper part of the concave portion 4 becomes thin, the upper film is adhered in the post-processing, so that the upper film is reinforced. As a result, a thin film material can be used as the lower film.

[0029]

As described above, in the deep drawing type packaging machine according to the present invention, since the film is molded using the male mold, the thickness of the bottom portion of the concave portion can be made relatively thick. In addition, it is possible to use a thin film, so that the cost can be reduced and the manufacturing and processing can be facilitated. Further, in the case of the male mold, since the outer shape is processed, a relatively complicated shape can be easily manufactured. In addition, an expensive female mold is not required.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a conventional deep drawing type packaging machine to which the present invention is applied.

FIG. 2 is a sectional view showing an example of a conventional molding device.

FIG. 3 is a view showing a recess formed by the molding apparatus.

FIG. 4 is a cross-sectional view showing an example of a molding device used in an embodiment of the deep drawing type packaging machine according to the present invention.

FIG. 5 is a diagram illustrating an operation.

FIG. 6 is a diagram illustrating an operation.

FIG. 7 is a view showing a recess formed by the molding apparatus shown in FIG. 4;

[Explanation of symbols]

 2 Lower film 4 Recess 4a Bottom 4b R part 4c Upper part 10 Molding device 11 Upper box 12 Lower box 13 O-ring 14, 15 Heating plate 16 Male 16a Support plate 16b Lower surface 17 Exhaust communication pipe 18 Intake communication pipe 19 Partition wall

Claims (2)

[Claims] 1. A molding device for molding a concave portion with respect to a lower film that is intermittently conveyed, and the lower film disposed downstream of the molding device and having an article to be packaged inserted into the concave portion. Means for covering the upper film with respect to, sealing means for sealing the lower film and a predetermined portion of the upper film to seal the concave portion, and cutting predetermined portions of the lower film and the upper film to individually A deep drawing type packaging apparatus provided with cutting means for manufacturing the package body, wherein the molding apparatus comprises an upper box and a lower box, and the upper box conforms to the inner shape of the recess. A male mold having an outer shape is arranged so as to be able to move up and down, and the lower box is made movable up and down, and a compressed gas can be supplied into the lower box. Features a deep drawing type packaging machine. 2. The deep drawing type packaging machine according to claim 1, further comprising a mechanism for forcibly exhausting the air in the upper box.