JPH09314400A - Device for forming vessel of synthetic resin film and method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently produce a vessel of synthetic resin film by respectively providing warming devices onto a bar like male die having outside teeth, a female die of forming a radiation like bevel teeth on the cone-shaped upper part continuing to the mutually opposing inside teeth and a 3rd die having an angle bevel teeth corresponding to the bevel teeth. SOLUTION: A center shaft 4 that a bar like die 1 is moved up and down hangs a 3rd die 3 with an arm metal tool 6, when the center shaft 4 is lowered, while a forming material entered between the 3rd die 3 and a lower die 2 is pressurized, the bar like die 1 is passed through the center of the 3rd die 3, the forming material is pushed in, moved inside the lower die 2 and it is formed. The bar like die 1 is made preferably in a tapering shape toward the top end, the 3rd die 3 has a bevel gear like bevel teeth in radiation like from the center, the lower die 2 has cone-shaped bevel teeth fitting to the bevel teeth of the 3rd die 3 and on the central part, it has a clearance corresponding to the bar like die 1 and being suitable to the thickness of the forming material. Heating devices are installed on the respective dies. Therefore, the highly efficient production of the vessel of synthetic rein is realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used as a container for storing various foods, and as a small container for minimizing the influence on other foods when storing different foods in the same large container. However, since the small container is made of a synthetic resin film, it can be heated in a microwave oven.

[0002]

2. Description of the Related Art Conventionally, as a container of this type, a paper material such as glassine paper has been mainly manufactured as an individual packaging of chocolate in the past, and in recent years, aluminum foil has been mainly manufactured. Each of these is manufactured by stacking a large number of the respective materials, for example, by inserting the material in a unit of 15 to 20 between male and female molds and press-molding.

[0003]

In such an aluminum foil container, when a microwave oven is used for heating food, a discharge phenomenon is generated in the microwave oven and there is a risk of fire and the like. Abnormalities occur such as the part that cannot be heated due to the reflection of radio waves, on the other hand,
When using a paper container, it is not affected by radio waves, so there is no problem with the aluminum foil,
Since the water and oil contained in the food permeate the paper material peculiar to the paper material, the food juice migrates to other food and the taste is impaired.

Some papers are provided with a permeation-preventing film on the surface of the paper in order to compensate for these drawbacks. However, even if the surface is protected by a moisture-proof film, the cut surface around the paper container is not protected. , Food juice and water are absorbed, and when heated in a microwave oven etc. in this state, the food juice and water absorbed inside evaporate explosively and crush the paper material, or peel it into two front and back sheets. This phenomenon occurs and the food in the container is discharged.

Molded containers made of synthetic resin film have been manufactured for the purpose of solving these problems.
Poor retention of the molded shape and poor shape retention performance, which means that it is not possible to retain the contents sufficiently, or it takes a lot of time during molding, resulting in poor quality and productivity. It was a thing.

The present invention provides an apparatus for molding a container made of a synthetic resin film and a method for molding the same for the purpose of solving such problems.

[0007]

SUMMARY OF THE INVENTION A molding apparatus for a synthetic resin film container according to the present invention, which has achieved the above object, is a synthetic resin film container molding in which a large number of flat-shaped synthetic resin films are laminated. It was discovered that it is effective to attach a paper material having a slipperiness that can withstand the pressure and sliding during molding with the molding die to both the top and bottom surfaces of the material for paper. Tried various papers from thin paper to fine paper, kraft paper.

Further, in the case of a synthetic resin film which is highly recoverable even if it is deformed, it is necessary to heat it during the deformation process, and after that, the deformed product is kept at a temperature close to room temperature, of course. It was confirmed that it is necessary to maintain the state of being molded and processed to a temperature below the softening point of the synthetic resin, so in order to maintain its shape retention, high-quality paper effective for shape retention By interposing it in a synthetic resin film material in which many sheets of paper or kraft paper are laminated, its shape-retaining property can be utilized, and metal foil such as aluminum foil having a higher shape-retaining property can be used in the same manner as the above-mentioned paper material. It was confirmed that it is also effective to use a synthetic resin film material laminated in a large number of sheets instead of the paper material, or to use it together with the paper material.

As described above, since a material having a high shape-retaining property has a high deformation resistance at the time of molding, it is effective that the male mold used for molding has a tapered taper toward the tip. Things turned out. In addition, since the deformation resistance is particularly large during the molding process in order to mold with a material having a high shape retention as described above, it is important to effectively use the third die of the angled bevel teeth. A heater for heating is also placed in the third mold to heat it above the softening point of the synthetic resin to be molded, and regarding the pressurization of the third mold which was not performed in this kind of molding, It has been discovered that it is effective to increase the work deformation pressure in the third mold with the movement.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Regarding the production of a synthetic resin film container, first, there is a deformation resistance against molding of the synthetic resin film, which generally means that the synthetic resin film has a high rigidity at room temperature. In order to mold and process this type of material, the deformation resistance is overcome, so that the degree of processing in both male and female molding dies is first affected.

Further, since extreme deformation processing is required for these materials, the resistance when the materials are deformed by the mold becomes large, and in order to protect the molding material from damage, the molding material side in contact with the molding die is protected. If a paper material with slipperiness is provided on the paper, or if the paper material has a shape-retaining property, the function of maintaining the molded state by also suppressing the restoration of the synthetic resin film to flat after molding do.

Further, when a metal foil is used in place of these paper materials, the shape retention property is better and effective, but the effect of heating effective for forming the synthetic resin film is better than that of the paper material. It goes without saying that a metal foil having high thermal conductivity is more effective. Needless to say, it is effective to carry out the deformation molding process in a state of being kept at a temperature higher than the softening point of each synthetic resin film in order to eliminate the restoring property of the synthetic resin film.

In order to further enhance the effect, the heat-retaining shape-forming material such as paper material laminated on both outer sides of the synthetic resin film is adjusted to maintain the balance with the heat-retaining temperature, thereby shortening the processing time. It is also possible to adjust it to increase productivity. The pressing action of the processing material of the third die and the lower female die, which is added as a pre-processing that can be said to be a stepwise pre-processing at the time of molding, enhances the effect of heating to a temperature above the softening point described above. The function is made effective, and the fact that the pressing force is gradually increased in accordance with the movement of the male die in the molding process makes it possible to further enhance the effect.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing an entire main mold part of a synthetic resin film container molding apparatus according to the present invention, in which an upper mold (rod-shaped mold) 1 that plays a central role in molding moves up and down. It is attached to the central shaft 4.

Similarly, the central shaft 4 is provided with a third member for preforming.
An arm metal fitting 6 for suspending the metal mold (male metal mold) 3 is attached and lowered by a suspension bolt 7, and a spring (third metal mold clamping mechanism) 8 is provided under the arm metal fitting 6, When the shaft 4 is lowered, first, pressure is started in a state where the molding material is put between the third mold 3 and the lower mold (female mold) 2, and the spring 8 is further compressed while being compressed and the upper mold is pressed. 1 gradually moves downward together with the central axis 4, passes through the center of the third mold 3, and further moves into the lower mold 2 while pressing the molding material.

During this time, the spring 8 contracts with the movement of the central shaft 4 until reaching the bottom dead center, and the bolt 9 operates in opposition to the process, and the lower die 2 and the lower metal die. The spring 10 is passed through the mold pedestal 5 and moves downward with the downward movement of the upper mold 1 via the spring 10, and the spring 10 also gradually expands. The expansion of the spring 10 assists the pressing force of the third mold 3 against the lower mold 2, and the bolt 9 performs the mold matching function of the third mold 3 to the lower mold 2 in the circumferential direction. Have a role.

When the central shaft 4 rises, a phenomenon completely opposite to that at the time of lowering occurs, the lower spring 10 contracts, the upper spring 8 gradually extends, and the third mold 3 is lifted and moves away from the lower mold 2. The center shaft 4 may be generally attached to a crank press, or can be applied to a foot press, an air press, or any other mechanical device having a parallel movement function.

2A and 2B show a straight type upper mold 1A, and FIGS. 2C and 2D show a tapered upper mold 1B. Electric heaters 20A and 20B for heating are attached to each of these in an embedded manner.

3 (a) and 3 (b) are general views of the third mold 3, in which a hole having a size such that the upper mold 1 can freely move is provided at the center, and a hole is radially formed on the circumference from the center. The bevel gear-shaped processing is applied to the wavy shape. The screw hole 11 is for the hanging bolt 7, and the drill hole 12 is for the hanging bolt 9. An electric heater 21 for heating the third mold 3 as well.
A and 21B are embedded.

FIG. 4 shows the lower die 2 and the third die 3
It has a mortar-shaped recess that fits into the bevel gear-shaped irregularities of, and a spline groove of the internal tooth mold facing the upper mold 1 is machined on the bottom of the center part, and its size is formed on the upper mold 1. It is processed into a size with a gap corresponding to the heat of the material.
Electric heaters 22A and 22B for heating are also embedded in the lower mold 2. Further, the lower mold 2 is provided with a drill hole 13 through which the bolt 9 is passed.

FIG. 5 shows an arm fitting 6 for suspending the third mold 3 described above, which has a hole capable of being fixed to the central shaft 4 and a stop bolt in the center. Also, the hanging bolt 7
A hole 14 is provided through which the holes are inserted.

FIG. 6 shows a product (a container made of a synthetic resin film) 1 which is formed by laminating a large number of sheets using the apparatus of the present invention.
5 shows a perspective view of FIG. FIG. 7 shows the pre-molding material 16, which is attached to the upper surface and the paper material 17 that is attached to the upper surface that maintains the shape retention and the smoothness that facilitates the processing deformation during molding processing. FIG. 3 is a perspective view of a synthetic resin film group 18 in which a large number of sheets of synthetic resin film 18 protected by a paper material 19 are stacked.

FIG. 8 is a cross-sectional view of the perspective view of FIG. 7, in which the paper material attached to the upper surface is indicated by 17a and 17b, the synthetic resin film of a plurality of laminated sheets is indicated by 18, and the paper material attached to the lower surface is indicated. The materials are indicated by 19a, 19b and 19c.

[Embodiment 1] Using the container forming apparatus shown in FIG. 1, 25 OPP films of 40 μm thickness made by Honshu Film Co., Ltd. as synthetic resin films were laminated, and 90 g / m ² of high quality was formed on the upper surface thereof. Place two sheets of paper, one on the bottom
Two sheets of 25 g / m ² central base paper for corrugated board are stacked and
The material 16 that was cut into a circular shape as shown in (1) was placed on the lower mold 2 and was molded at a molding speed of 30 times / minute.

At this time, the heating temperature of the upper mold 1 is 210 ° C.,
The heating temperature of the lower mold 2 was 209 ° C, and the heating temperature of the third mold 3 was 220 ° C. As a result, a satisfactory evaluation was obtained regarding the shape retention of the product and the adhesion of the upper and lower surfaces to the paper material.

[Embodiment 2] With the same material structure as that of Embodiment 1, the temperature of the third mold 3 is not raised, and
The molding was carried out under exactly the same conditions as in Example 1 except that the temperature was kept at room temperature. As a result, the adhesiveness to the upper and lower paper-like materials is not a problem, but the shape retention is poor and the container opening is wide open, so it cannot be said that the product is sufficient. Therefore, it is necessary to heat the third mold 3. I really felt.

[Embodiment 3] Among the conditions performed in Embodiment 2, the molding rate was gradually decreased from the cycle of 30 times / minute, and the effect was confirmed. It has been found that a cycle of 5 times / minute is required to become the same as that of the first embodiment. We also found that the productivity was extremely poor.

[Embodiment 4] Among the conditions of Embodiment 1, fine paper (90 g / m 2) on the upper surface of the paper material provided above and below
² ) One sheet, and the bottom base paper for corrugated board (125
g / m ² ) is the same, and when the molding process is performed under exactly the same conditions except for the others, the shape retention is a little worse than when two sheets of paper material are used, the opening tends to open, and 40 μm
I felt a little difficulty in separating the m-thick OPP film, but it is possible to use one side of the synthetic resin film, so it is safe to use a wax-based resin agent or one coated with a silicone-based resin agent. Was done. It was also found that the more the paper-like materials provided above and below, the better the shape retention.

[Embodiment 5] Of the conditions used in Embodiment 4, a 40 μm thick OPP film having a release wax coat on one side was used. Hard aluminum foil on film side 5
One 0 μm-thick sheet was inserted, and the other conditions were the same as in Example 1 and the molding process was performed. The results were very good and everything was satisfactory.

[Embodiment 6] Using the container molding apparatus shown in FIG. 1, as a synthetic resin film, a 15 μm thick O film was formed.
A PP film and an OPP film having a thickness of 20 μm are printed on one side, and the two OPP films are attached to each other with the printing surface inside by a urethane-based two-component dry laminating adhesive. Two sheets of high-quality paper of 90 g / m ² are stacked on top of each other, and three sheets of central corrugated paper K of 125 g / m ² for corrugated board are stacked on the lower surface,
Molding was performed at a molding speed of 30 times / minute while the material 16 cut into a circle as shown in FIG. 7 was placed between the lower mold 2 and the third mold 3.

The heating temperature of the upper die 1 at this time is 209 ° C.,
The heating temperature of the lower mold 2 was 200 ° C, and the heating temperature of the third mold 3 was 220 ° C. The result of molding is that the release wax is coated on one side, so printing ink flow failure
Also, there is no problem of blocking adhesion between films,
The shape retention was also perfect. Also, as shown in FIG.
When the taper taper type upper die 1B shown in (d) was used, the paper material was not broken and the container could be stably molded.

[Embodiment 7] Under the same conditions as in Embodiment 6, in the molding step, the third mold 3 is sandwiched between the lower mold 2 and the molding material 16 for preliminary operation. In order to investigate the effect of the spring 8 shown in FIG. 1 for the purpose of making the molding effective, the spring 8 is removed, and the clamping force is only the effect of the spring 10 shown in FIG. Molding was performed under the same conditions. The result is that the shape retention is very poor, and there are many phenomena in which the openings are open, especially in the film at the center of the stack of many sheets. The effect of the spring 8 which gives a clamping force to the lower mold 2 has been clarified.

[Embodiment 8] Under the same conditions as in Embodiment 6, the temperature of the upper die 1 is 80 ° C., the temperature of the lower die 2 is 850 ° C., and the temperature of the third die 3 is 70. C., and other conditions were exactly the same as in Example 6 for molding. As a result, the moldability and the shape-retaining property were poor, and it could not be said to be a product. What is understood from this is that it is necessary to maintain the temperature of the molding die above the softening point of the resin to be processed.

[Embodiment 9] A synthetic resin film molded under the conditions of Embodiment 1 is a vinylidene chloride resin film having a thickness of 20 μm and a polypropylene resin film having a thickness of 20 μm, which are formed by a polyurethane dry laminate adhesive. A molding test was conducted under the same conditions as in Embodiment 1 except that the laminated film material was used as the molding material 16, but there was no problem in terms of quality such as moldability.

[Embodiment 10] Among the conditions of Embodiment 6, the OPP film having a thickness of 30 μm and the PET film having a thickness of 10 μm are used as the material for molding, and the urethane-based two-component liquid is used with the printing surface inside. Molding material made by pasting with a mold dry laminate adhesive and then applying a releasable wax coat to the outside of the OPP film with a thickness of 30 μm.
The sheets were laminated in layers and the molding was performed under the same conditions as in Example 6 except for the above. The results were reasonably good.

[0036]

As described above, according to the present invention, productivity is improved by nearly 10 times as compared with the conventional metal foil or the molding apparatus for glassine paper, which has very poor productivity. In addition to being able to achieve the above, it is possible to establish a standard for the stability of its working conditions, and to solve problems in food cooking and food preservation, and to make synthetic resin film containers that enable safe cooking highly efficient. Can be produced.

[Brief description of drawings]

FIG. 1 is an overall side view of a main mold portion of a synthetic resin film container molding device.

FIG. 2A is a side view of a straight upper mold, and FIG.
Is an end view thereof. (C) is a side view of the taper taper type upper die, and (d) is an end view thereof.

FIG. 3A is a side view of an upper mold, and FIG. 3B is a bottom view.

FIG. 4A is a plan view of a lower mold, and FIG. 4B is a side view.

5A is a side view of the arm fitting, and FIG. 5B is a bottom view.

FIG. 6 is a perspective view of a molded product in which a large number of synthetic resin film containers are laminated.

FIG. 7 is a perspective view of a synthetic resin film in which a large number of sheets have been laminated before molding and a molding material in which paper materials are attached to the upper and lower surfaces thereof.

8 is a cross-sectional view of the molding material before the molding process shown in FIG.

[Explanation of symbols]

1 (1A, 1B) ... upper mold, 2 ... lower mold, 3 ... third mold, 4 ... central axis, 5 ... lower mold pedestal, 6 ... arm fitting, 7 ...
Third mold hanging bolt, 8 ... Main spring for pinching, 9 ... Third
Mold guide bolt, 10 ... clamping auxiliary spring, 11 ... hanging bolt screw hole, 12 ... guide bolt guide hole, 13 ... guide bolt hole, 14 ... hanging bolt hole, 17 (17a, 17b) ) ... Paper material attached to the upper surface, 18
... Manufacturing material for multi-layer synthetic resin film, 19 (1
9a, 19b, 19c) ... Lower surface attached paper material, 20A, 2
0B ... electric heater for upper mold, 21A, 21B ... electric heater for third mold, 22A, 22B ... electric heater for lower mold.

Claims (8)

[Claims] 1. A rod-shaped male mold having a large number of protrusions of outer teeth, and a male mold having a number of teeth of this male mold, as a container molding device made of a synthetic resin film formed by laminating a large number of flat-shaped synthetic resin films. In addition to a female die having inner teeth of opposite numbers of teeth, the upper portion of the female die is shaped like a mortar to form radial bevel teeth following the inner teeth, and a third bevel tooth corresponding to the bevel tooth is formed. A molding device for a container made of a synthetic resin film, characterized by having a mold and a heating device provided in each mold. 2. The molding apparatus for a container made of a synthetic resin film according to claim 1, wherein the rod-shaped male die has a rod-shaped tip portion formed in a tapered shape. 3. The male die within the female die according to claim 1 or 2, while pressing the laminated synthetic resin film before being formed by the third die and the mortar-shaped bevel teeth on the upper side of the female die. The synthetic resin film container is molded by inserting it into the mold, and has a mechanism equipped so as to gradually increase the clamping force of the third mold in accordance with the movement for molding the male mold. An apparatus for molding a container made of a synthetic resin film according to claim 1 or 2. 4. When forming a container made of a synthetic resin film by laminating a large number of flat-shaped synthetic resin films, at least one sheet is formed on the uppermost surface and the lowermost surface of the laminated flat-shaped synthetic resin film. A method for molding a container made of a synthetic resin film, characterized in that the above paper material is added. 5. When forming a container made of synthetic resin film by laminating a large number of flat-shaped synthetic resin films, at least one sheet is formed on the uppermost and lowermost surfaces of the laminated flat-shaped synthetic resin film. 1. A method for molding a synthetic resin film container, which is characterized in that the above metal foil is added. 6. When forming a container made of a synthetic resin film by laminating a large number of flat-shaped synthetic resin films, one of the uppermost surface and the lowermost surface of the laminated flat-shaped synthetic resin film is formed. A method for molding a container made of a synthetic resin film, characterized in that a paper material is added to the above, and a metal foil is added to the other surface. 7. The synthetic resin film according to claim 4, wherein at least one metal foil is inserted into the laminated flat-shaped synthetic resin film having a large number of laminated sheets. Molding method for containers. 8. When molding a synthetic resin film container formed by laminating a large number of flat-shaped synthetic resin films, three molding dies are added to a temperature above the softening point of the synthetic resin film under appropriate conditions. The method for molding a container made of a synthetic resin film according to claim 4, wherein the container is heated.