JP3667882B2 - Molding method for synthetic resin film containers - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is used as a container for storing various foods, and is used as a small container for minimizing the influence on other foods when storing different kinds of food in the same large container. Since the small container is made of synthetic resin film, it can be heated in a microwave oven.
[0002]
[Prior art]
Traditionally, this type of container has been manufactured mainly from paper-based materials such as glassine paper as individual packaging for chocolate, and in recent years has been manufactured mainly from aluminum foil.
All of these are manufactured by laminating a large number of the respective materials, for example, by inserting 15 to 20 sheets between male and female molds and press molding them.
[0003]
[Problems to be solved by the invention]
In such an aluminum foil container, when a microwave oven is used for heating food, there is a risk of a discharge phenomenon in the range, a fire, etc., and the portion that cannot be heated by the reflection of radio waves from the aluminum foil. On the other hand, when using a paper container, there is no problem with the aluminum foil because it is not particularly affected by radio waves. Since the moisture and oil components that permeate are permeated, the food juice moves to other foods and the taste is impaired.
[0004]
Also, depending on the paper quality, there are some papers that are provided with a permeation prevention film to compensate for these drawbacks. However, even if the surface is protected with a moisture-proof film, the cut surface around the paper container is not protected. Or water is absorbed, and when heated in a microwave oven or the like in this state, the food juice or water absorbed inside explosively evaporates and crushes the paper material, or peels off into two sheets It is generated and the food in the container is discharged.
[0005]
Synthetic resin film molded containers have also been manufactured to solve these problems, but they cannot hold the contents sufficiently because they have poor molded shape retention capability and poor shape retention performance. In addition, it takes much time for molding, and the quality and productivity are inferior.
[0006]
The present invention provides a method for molding a synthetic resin film container aimed at solving such problems.
[0007]
[Means for Solving the Problems]
The method for molding a synthetic resin film container of the present invention, which has achieved the above object, comprises the steps of forming the uppermost surface and the lowermost surface of a synthetic resin film container molding material formed by laminating a large number of flat synthetic resin films. It was discovered that it was effective to attach a paper material with a slipperiness that can withstand pressure and sliding during molding with a molding die on both sides, and from paper to high-quality paper, kraft paper, etc. I tried various papers.
[0008]
Also, in the case of a synthetic resin film having high resilience even if it is deformed, it is necessary to heat it at the time of deformation processing, and after that, the deformed material is brought to a temperature close to room temperature, naturally of each synthetic resin. Since we were able to confirm that it was necessary to maintain the state of molding processing to a temperature below the softening point, high-quality paper or kraft paper effective for shape retention in order to maintain its shape retention In order to make use of its shape-retaining property by interposing it in a synthetic resin film material in which a large number of sheets are laminated, metal foils such as aluminum foil having higher shape retaining properties are also laminated in the same way as the above paper material It was confirmed that it was effective to use the synthetic resin film material instead of the paper material, or to share it with the paper material.
[0009]
In this way, since the material with high shape retention has high deformation resistance during molding, it has been found that the male mold used for molding is effective with a taper taper toward the tip. did.
In addition, since molding is performed with a material having high shape-retaining properties as described above, since the deformation resistance is particularly large during the molding process, it is important to effectively use the third die of the angle umbrella. A heating heater is also put in the third mold and heated above the softening point of the synthetic resin to be molded. Further, regarding the pressurization of the third mold that was not performed in this type of molding, It has been found that it is effective to increase the working deformation pressure in the third mold as it moves.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Regarding the production of synthetic resin film containers, the first is deformation resistance against molding of synthetic resin films, which is generally the high rigidity of synthetic resin films at room temperature. To overcome this deformation resistance, the degree of processing in both male and female molds is first affected.
[0011]
In addition, since extreme deformation processing is required for these materials, the resistance when the materials are deformed by the mold is increased, and in order to protect the molding material from damage, the sliding side of the molding material in contact with the molding die is improved. When a paper material having a certain degree is provided, or when the paper material has shape-retaining properties, it functions to maintain the molded state while suppressing the restoration of the synthetic resin film to a flat size after molding.
[0012]
In addition, when metal foil is used instead of these paper materials, the shape retention is better and more effective, but the heating effect effective for the molding of synthetic resin film is more thermally conductive than paper materials. Needless to say, a higher metal foil is more effective.
Needless to say, in order to eliminate the restoring property of the synthetic resin film, it is effective to carry out deformation molding while maintaining the temperature higher than the softening point of each synthetic resin film.
[0013]
In addition, in order to further enhance the effect, by adjusting the heat retaining material such as paper material laminated on both sides outside of the synthetic resin film and keeping the balance with the heating temperature, the processing time can be adjusted. It is also possible to increase productivity.
The pressurizing action of the work material of the third mold and the lower female mold, which is added as a preliminary process that can be said to be a pre-process in the process of forming, enhances the effect of heating to a temperature above the softening point. The effect is made effective, and the fact that the pressing force is gradually increased in accordance with the movement of the male mold in the molding process can further increase the effect.
[0014]
【Example】
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing the entirety of a main mold portion of a synthetic resin film container molding apparatus used in a synthetic resin film container molding method according to the present invention. A mold 1 is attached to a central shaft 4 that moves up and down.
[0015]
Similarly, an arm bracket 6 for hanging a third mold (male mold) 3 to be preformed is attached to the central shaft 4, and is lowered by a suspension bolt 7. A spring ( When there is a third mold clamping mechanism 8 and the central shaft 4 is lowered, first, pressurization starts with a molding material placed between the third mold 3 and the lower mold (female mold) 2. The spring 8 is further pressed down while being compressed, and the upper mold 1 is gradually moved downward together with the central shaft 4 and further moved into the lower mold 2 through the center of the third mold 3 while pressing the molding material. I will do it.
[0016]
During this time, the spring 8 contracts with the movement of the central axis 4 until reaching the bottom dead center, and it is the bolt 9 that operates in opposition to the process, and the lower mold 2 and the lower mold base. 5, the spring 10 is lowered downward as the upper mold 1 is moved downward via the spring 10, and the spring 10 is gradually extended.
The extension of the spring 10 helps the pressing force against the lower mold 2 of the third mold 3, and the bolt 9 performs a function of aligning the third mold 3 with the lower mold 2 in the circumferential direction. Have a role.
[0017]
When the central shaft 4 is raised, the phenomenon is completely opposite to that at the time of lowering, the lower spring 10 contracts, the upper spring 8 gradually extends, and moves away from the lower mold 2 while lifting the third mold 3.
The central shaft 4 may be generally attached to a crank press, and can be applied to mechanical devices having all parallel movement functions such as a foot press and an air press.
[0018]
2A and 2B show a straight type upper mold 1A, and FIGS. 2C and 2D show a tapered type upper mold 1B.
In each of these, electric heaters 20A and 20B for heating are attached in an embedded manner.
[0019]
3 (a) and 3 (b) are overall views of the third mold 3, in which a hole having a size that allows the upper mold 1 to freely move is provided in the center, and radial waves are generated from the center to the circumference. In this shape, bevel gears are processed.
The screw hole 11 is for the suspension bolt 7, and the drill hole 12 is for the suspension bolt 9. Electric heaters 21A and 21B for heating are also embedded in the third mold 3.
[0020]
FIG. 4 shows a lower mold 2, which has a bowl-shaped depression that fits into the bevel gear-shaped irregularities of the third mold 3, and has an inner tooth mold facing the upper mold 1 at the center bottom. Spline grooves are processed, and the dimensions thereof are processed to a size including a gap corresponding to the thickness of the material to be molded into the upper mold 1. The lower mold 2 is also embedded with electric heaters 22A and 22B for heating. The lower mold 2 is provided with a drill hole 13 through which the bolt 9 is passed.
[0021]
FIG. 5 shows an arm bracket 6 for suspending the third mold 3 described above, and has a hole that can be fixed to the central shaft 4 and a retaining bolt at the center. A hole 14 through which the suspension bolt 7 is passed is provided.
[0022]
FIG. 6 shows a perspective view of a product (synthetic resin film container) 15 which is laminated and molded by the above apparatus.
FIG. 7 shows a material 16 before molding processing, and it is attached to the lower surface of the paper material 17 which is attached to the upper surface which keeps the slipperiness and the shape retaining property which facilitate the processing deformation at the time of the molding processing, and has the heat retaining property. It is the figure which looked at the synthetic resin film group 18 laminated | stacked many sheets protected by the paper material 19 to do.
[0023]
FIG. 8 is a cross-sectional view of the perspective view shown in FIG. 7. The paper material attached to the top surface is indicated by 17a and 17b, the laminated synthetic resin film is indicated by 18, and the paper material attached to the bottom surface is 19a. , 19b, 19c.
[0024]
Embodiment Example 1
Using the container forming apparatus shown in FIG. 1, 25 sheets of OPP film 40 μm thick manufactured by Honshu Film Co., Ltd. are laminated as a synthetic resin film, and ^two high-quality papers of 90 g / m ² are placed on the upper surface, Two sheets of core paper for corrugated cardboard of 125 g / m ² are stacked, and the material 16 cut into a circle as shown in FIG. 7 is placed on the lower mold 2 and is molded at a molding speed of 30 times / minute. It was.
[0025]
At this time, the heating temperature of the upper mold 1 was 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, satisfactory evaluation was obtained for the shape retention of the product and the adhesiveness of the upper and lower surfaces to the paper material.
[0026]
Embodiment Example 2
With the same material configuration as in Embodiment 1, the temperature of the third mold 3 was not raised, and the room temperature was kept at 15 ° C., and the molding process was performed under exactly the same conditions as in Embodiment 1. As a result, there is no problem in the adhesion to the upper and lower paper materials, but the shape retention is poor and the opening of the container is wide open, so it cannot be said that the product is sufficient, and the third mold 3 needs to be heated. I felt it.
[0027]
Embodiment Example 3
Among the conditions performed in the embodiment example 2, the molding speed was gradually decreased from the cycle of 30 times / minute and the effect was confirmed. It turns out that it is a cycle of times / minute. It was also found that the productivity was very bad.
[0028]
Embodiment Example 4
Among the conditions of Example 1 of the embodiment, one sheet of high-quality paper (90 g / m ² ) on the upper surface of the paper material provided on the top and bottom, and one sheet of central base paper for corrugated board (125 g / m ² ) on the lower surface If the molding process is carried out under exactly the same conditions, the shape retention will be slightly worse than when two paper materials are used, the opening will open, and the separation of the 40 μm thick OPP film will be a little difficult. However, since this may be on one side of the synthetic resin film, it was shown that it is safe to use a wax-based resin agent or a silicon-based resin agent. It was also found that the shape retention was better when there were more paper-based materials installed on the top and bottom.
[0029]
Embodiment Example 5
Of the conditions performed in Embodiment 4, a 40 μm thick OPP film with a release wax coating on one side was used, and aluminum foil was hard 50 μm on the inner side (film side) of each upper and lower paper material. One sheet of each thickness was inserted, and the other conditions were the same as in Example 1 to perform molding. The results were very good and all were satisfactory.
[0030]
Embodiment Example 6
Using the container forming apparatus shown in FIG. 1, a synthetic resin film is printed on one side of a 15 μm-thick OPP film and a 20 μm-thick OPP film, and these two OPP films are urethane-based with the printing surface inside. Using 25 sheets of this film laminated with two-component dry laminate adhesive, ^two 90g / m ² high quality papers are placed on the top and 125g / m ^{2 on} the bottom for corrugated cardboard 7 pieces of central base paper are stacked and the material 16 cut into a circle as shown in FIG. 7 is put between the lower mold 2 and the third mold 3 and is molded at a molding speed of 30 times / minute. went.
[0031]
At this time, the heating temperature of the upper mold 1 was 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.
As a result of molding, since the release wax was coated on one side, there was no problem in printing ink flow and blocking adhesion between films, and the shape retention was satisfactory.
In addition, when the tapered taper type upper die 1B shown in FIGS. 2C and 2D was used, the paper material was not torn and the container could be stably molded.
[0032]
Embodiment Example 7
FIG. 1 shows the purpose of making the pre-molding effective by clamping the third mold 3 to the lower mold 2 through the molding material 16 in the molding process within the same conditions as in the embodiment example 6. In order to investigate the effect of the spring 8 shown in FIG. 1, the spring 8 was removed, and the forming process was performed under exactly the same conditions as in Example 6 except that the clamping pressure was only the effect of the spring 10 shown in FIG.
As a result, the shape-retaining property is very poor, and in particular, there is a phenomenon in which the opening has a mouth-opening shape, especially in the film at the center of the lamination of a large number of sheets. The effect of the spring 8 which gives the clamping pressure to the lower mold 2 becomes clear.
[0033]
Embodiment Example 8
Of the same conditions as in Embodiment 6, the temperature of the upper mold 1 is set to 80 ° C., the temperature of the lower mold 2 is set to 85 ° C. , and the temperature of the third mold 3 is set to 70 ° C. Molding was performed in exactly the same manner as in Embodiment 6.
As a result, both formability and shape retention were poor and could not be said to be a product. What has been understood is that it is necessary to maintain the temperature of the molding die above the softening point of the resin to be processed.
[0034]
[Embodiment Example 9]
A synthetic resin film to be molded under the same conditions as in Embodiment 1 is formed from a film material obtained by bonding a 20 μm-thick vinylidene chloride resin film and a 20 μm-thick polypropylene resin film with a polyurethane-based dry laminate adhesive. As for the other conditions, the molding test was conducted under the same conditions as in the first embodiment. However, there was no problem in quality such as moldability.
[0035]
[Embodiment 10]
Of the conditions of Embodiment Example 6, a 30 μm thick OPP film and a 10 μm thick printed PET film are bonded to the material used for molding with a urethane-based two-component dry laminate adhesive with the printed surface inside. Thereafter, 25 molding materials prepared by applying a releasable wax coat to the outside of the 30 μm thick OPP film were laminated in layers, and the others were molded under the same conditions as in Example 6. The result was excellent and satisfactory.
[0036]
【The invention's effect】
As described above, according to the present invention, productivity can be improved by nearly 10 times compared to the conventional metal foil or glassine paper molding apparatus which is very poor in productivity. Able to establish a standard for the stability of the working conditions, and to efficiently produce containers made of synthetic resin film that can be used for food cooking and solve the problems of food preservation and enable safe cooking. It is.
[Brief description of the drawings]
FIG. 1 is an overall side view of a main mold portion of a synthetic resin film container molding apparatus.
2A is a side view of a straight upper mold, and FIG. 2B is an end view thereof. (C) is a side view of a taper taper type upper die, and (d) is an end view thereof.
3A is a side view of an upper mold, and FIG. 3B is a bottom view.
4A is a plan view of a lower mold, and FIG. 4B is a side view.
5A is a side view of an arm bracket, 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 are laminated before molding and a molding material in which a paper material is attached to the upper and lower surfaces of the synthetic resin film.
8 is a cross-sectional view of the molding material before the molding process shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 (1A, 1B) ... Upper metal mold, 2 ... Lower metal mold, 3 ... 3rd metal mold, 4 ... Center axis, 5 ... Base for lower metal mold, 6 ... Arm metal fitting, 7 ... 3rd metal mold hanging Bolt, 8 ... main spring for clamping, 9 ... guide bolt for third mold, 10 ... auxiliary spring for clamping, 11 ... screw hole for suspension bolt, 12 ... guide hole for guide bolt, 13 ... hole for guide bolt, 14 ... Hanging bolt holes, 17 (17a, 17b) ... Paper material attached to the upper surface, 18 ... Material for molding a multi-layer laminated synthetic resin film, 19 (19a, 19b, 19c) ... Paper material attached to the lower surface, 20A, 20B ... Electric heater for upper mold, 21A, 21B ... Electric heater for third mold, 22A, 22B ... Electric heater for lower mold.

Claims (7)

In addition to a rod-shaped male mold having a large number of outer teeth and a female mold having inner teeth corresponding to the number of teeth of the male mold, the upper portion of the female mold is shaped like a mortar and follows the inner teeth. Made of synthetic resin film, using a third mold with angled bevel teeth corresponding to the bevel teeth and laminating a large number of flat synthetic resin films in a separable state At the time of molding the container, at least one paper material is added to the uppermost surface and the lowermost surface of the laminated synthetic resin film, and a plurality of laminated synthetic resin films are laminated. A method for forming a synthetic resin film container, comprising inserting at least one metal foil into a laminate. In addition to a rod-shaped male mold having a large number of outer teeth and a female mold having inner teeth corresponding to the number of teeth of the male mold, the upper portion of the female mold is shaped like a mortar and follows the inner teeth. Made of synthetic resin film, using a third mold with angled bevel teeth corresponding to the bevel teeth and laminating a large number of flat synthetic resin films in a separable state At the time of molding the container, at least one metal foil is joined to the uppermost and lowermost surfaces of the laminated plastic resin film having a large number of laminated sheets, and A method for forming a synthetic resin film container, comprising inserting at least one metal foil into a laminate. In addition to a rod-shaped male mold having a large number of outer teeth and a female mold having inner teeth corresponding to the number of teeth of the male mold, the upper portion of the female mold is shaped like a mortar and follows the inner teeth. Made of synthetic resin film, using a third mold with angled bevel teeth corresponding to the bevel teeth and laminating a large number of flat synthetic resin films in a separable state When molding a container, a paper-like material is bonded to one of the top and bottom surfaces of a flat-shaped synthetic resin film laminated, and a metal foil is bonded to the other surface. A method for forming a synthetic resin film container, comprising inserting at least one metal foil into a laminate of laminated flat-shaped synthetic resin films. In addition to a rod-shaped male mold having a large number of outer teeth and a female mold having inner teeth corresponding to the number of teeth of the male mold, the upper portion of the female mold is shaped like a mortar and follows the inner teeth. Made of synthetic resin film, using a third mold with angled bevel teeth corresponding to the bevel teeth and laminating a large number of flat synthetic resin films in a separable state At the time of molding a container, at least one paper material is added to the uppermost and lowermost surfaces of the laminated flat synthetic resin film, and many flat synthetic resin films are laminated. When the synthetic resin film container is formed, the male mold, the female mold and the third mold are heated to a temperature equal to or higher than the softening point of the synthetic resin film under a considerable condition. Molding method of resin film container. In addition to a rod-shaped male mold having a large number of outer teeth and a female mold having inner teeth corresponding to the number of teeth of the male mold, the upper portion of the female mold is shaped like a mortar and follows the inner teeth. Made of synthetic resin film, using a third mold with angled bevel teeth corresponding to the bevel teeth and laminating a large number of flat synthetic resin films in a separable state At the time of molding a container, at least one metal foil is bonded to the uppermost and lowermost surfaces of the laminated flat resin film, and a large number of flat synthetic resin films are laminated. When the synthetic resin film container is formed, the male mold, the female mold and the third mold are heated to a temperature equal to or higher than the softening point of the synthetic resin film under a considerable condition. Molding method of resin film container. In addition to a rod-shaped male mold having a large number of outer teeth and a female mold having inner teeth corresponding to the number of teeth of the male mold, the upper portion of the female mold is shaped like a mortar and follows the inner teeth. Made of synthetic resin film, using a third mold with angled bevel teeth corresponding to the bevel teeth and laminating a large number of flat synthetic resin films in a separable state When molding a container, a sheet of paper is placed on one of the top and bottom surfaces of a flat synthetic resin film laminated. When molding a synthetic resin film container formed by laminating a large number of flat-shaped synthetic resin films with a material foil and a metal foil on the other surface, the synthetic resin film is subjected to a considerable condition. A method for forming a container made of a synthetic resin film, characterized in that the male mold, the female mold and the third mold are heated to a temperature equal to or higher than the softening point. When molding a synthetic resin film container formed by laminating a large number of flat-shaped synthetic resin films, the male mold, the female mold and the third mold are heated to a temperature above the softening point of the synthetic resin film under a considerable condition. The method for molding a synthetic resin film container according to any one of claims 1 to 3 , wherein the mold is heated.

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