JPH08183562A - Package and manufacture of package - Google Patents

Abstract

PURPOSE: To form a recessed surface with the same shape as an article on the package to stably perform the stacking by a method wherein a flat plate form article with a recessed surface such as a dish or a mat for gas stove is pinched with top and bottom two sheets of a thermoplastic resin film, and after those two films are fused along the peripheral edge of the article, the inside air is removed. CONSTITUTION: For a mat 2 for gas stove, a circular hole 3 is made at the center of a square flat plate, and an area around the hole is swollen upward as a mound 1. When such a mat 2 is packaged, a thermoplastic resin film sheet is continuously fed, and the mat 2 is placed on the top of the sheet. In addition, the thermoplastic resin film sheet is fed on the top of the mat 2, and the mat 2 under a condition wherein the mat 2 is pinched under a sandwich state is fed to a fusion punching out table by a pitch transfer. Then, the films along the periphery of the mat 2 are fused while being punched out by remaining a deaerating hole 4 at one part. Then, the film sheets are sealed 6, so that an intermediate package 5 is obtained. Then, the inside of the intermediate package 5 is deaerated in a vacuum chamber, and a package on which a recessed surface with the same shape as the mat 2 is formed is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the packaging of flat articles having concave depressions on one side, for example, dish-like articles, articles such as gas range mats, or articles having a concave surface on a part of the surface thereof. Regarding the body

[0002]

2. Description of the Related Art Conventionally, when an article having a concave surface on one side is wrapped with a sheet, the concave surface of the article is flattened by the sheet, and the volume becomes several times when stacking the packages, which is inconvenient for transportation and display. there were. For example, even if you use a heat shrink film, there is a space between the concave surface and the film,
It was not possible to stack the package efficiently by stacking the concave surface of the back surface of another article on the upper convex portion of the dish-shaped article. If the concave surface of the package that is wrapped from the point of protection of the surface of the article, printing of advertisements, and appearance as a product is concave along the shape of the article, the volume of the packaging form of the package is reduced to a fraction. Therefore, it is convenient for storage, transportation and display. Furthermore, when an article having a concave surface is wrapped, the packaging film is lifted from the surface of the article and the aesthetic appearance of the surface of the article is impaired.
In the latter case, it is possible to adopt a heat shrink film,
In this case, there is the disadvantage that the packaging film cannot be printed.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a packaging body in which the packaging film is sealed along the concave surface of the article in a dented state.

[0004]

DISCLOSURE OF THE INVENTION The present inventors have found that when a thermoplastic resin film is used as a packaging sheet in a package of an article having a concave surface, the inside of the package is degassed so that the film becomes a concave surface of the article. The purpose was achieved by the method of accommodating. That is, the present invention comprises the inventions of the following items. (1) An intermediate package formed by sandwiching a flat-shaped article having a concave surface on one side with two thermoplastic resin films from above and below in a sandwich shape, and thermally fusing the two upper and lower films along the peripheral edge of the article. A degassing hole is provided in a convex shape from one edge of the body, and the degassing hole is sealed so that the thermoplastic resin film facing the concave surface is closely attached to the concave surface along the concave surface. A package characterized by that. (2) The package according to item 1, wherein the sealing is performed by heat-sealing the degassing holes. (3) The package according to item 1, wherein the sealing is performed by a valve structure provided in the deaeration hole. (4) The package according to item 3, wherein the valve structure is formed by laminating two laminated films inside a deaeration film. (5) A flat sandwiched article having a concave surface between two long thermoplastic resin films is sandwiched and supplied to the fusing punching table by one-pitch transfer, and the peripheral edge of the article is cut on the fusing punching table. With a fusing punching blade having a shape in which the shape of the deaeration hole is convexly added to the shape corresponding to the above, the periphery of the article is punched out and fusion-sealed to once form an intermediate package, and the intermediate package is internally formed from the deaeration hole. A method of manufacturing a package in which air is discharged to maintain a deaeration hole in a sealed state. (6) A flat plate-like article having a concave surface is sandwiched between two long thermoplastic resin films, and further two valve film tapes are provided on the side edges where deaeration holes are provided. The product laminated inside is supplied to a fusing punching table, and the fusing hole is punched out by a fusing punching blade having a shape corresponding to the peripheral edge of the article to which a deaeration hole is added, and the article is hermetically sealed. Once the intermediate film is formed by stacking the valve films inside the container, the intermediate package is placed in a decompression chamber with the deaeration holes open and degassed by decompression to discharge the air inside the intermediate package, A method of manufacturing a package, wherein a degassing hole is automatically sealed by a film. The thermoplastic resin film used in the present invention is a thin film and can be used without particular limitation as long as it can be sealed by heat fusion. For example, polypropylene, polyethylene (low density, high density,
Thermoplastic films such as medium density and LLDPE), ethylene copolymers, polyesters, nylons can be used. In particular, by using a laminate film of two or more kinds of resins, for example, the packaging surface can be a film that is resistant to printability and scratches, and the inner surface can be a film that has good heat sealability and adhesion. The package of the present invention is manufactured by once forming the intermediate package, degassing the inside of the intermediate package and applying a reduced pressure to bring the packaging film into close contact with the surface of the article. For example, another long thermoplastic resin film is supplied so as to cover the upper surface of a flat plate-shaped article having a concave surface placed on a long thin thermoplastic resin film sheet, and on a thermal fusing table. The intermediate package is temporarily formed by the upper and lower films by heat-sealing along the peripheral edge of the article and heat-sealing the entire periphery of the article leaving a deaeration hole at the peripheral edge of the article. The intermediate package is degassed to obtain the package of the present invention. The article that can be adopted in the present invention is an article in which one surface is concave, and a circular one such as a gas range mat and a dish plate having a square peripheral edge as shown in FIGS. 1 and 2 and an oval shape, It can be applied to any peripheral article such as a star shape, a heart shape, and a cross shape.

In the present invention, the package of the present invention can be easily manufactured by adopting a shape in which the shape of the fusing punching blade matches the shape of the peripheral edge of the article. Even if the shape of the fusing punching blade is slightly larger than the peripheral edge of the article, the slack of the film of the package disappears during the degassing under reduced pressure. Further, the fusing punching blade used in the present invention is a fusing punching blade having a shape in which a convex portion corresponding to a deaeration hole portion is provided at one edge on the outer periphery corresponding to the shape of the article. In order to open the outlet of the degassing hole of the intermediate package, mechanically cut the portion corresponding to the outlet of the degassing hole of the long resin film beforehand, or carry out one-pitch transfer of the outlet of the degassing hole after punching by melting. It can be cut mechanically on the conveyor. Next, air is deaerated from the deaeration hole of this package with a vacuum pump to seal the package, and the package is packaged with the wrapping film stuck to the concave surface to obtain the package of the present invention. The sealing of the degassing holes of the present invention is preferably a structure that is naturally sealed if air is exhausted from the degassing holes, and when strict sealing is not required, if the convex portion of the degassing holes is formed to be a little elongated, Only by degassing under reduced pressure, atmospheric pressure is applied from the outside of the two films forming the degassing holes, and the film is naturally sealed. Therefore, it is desirable that the deaeration holes have a length of 2 cm or more, preferably 3 cm or more. The sealing property of the deaeration hole is a film having a high adhesiveness used for a wrap film, such as LLDPE, an ethylene-vinyl acetate copolymer film, as a deaeration film, and the deaeration film or the laminating film on the inner surface of the deaeration film. If adopted as, it can be dramatically improved. With this kind of consideration, the two sides of the degassing hole are laminated in a plane by heat fusion and the openings are overlapped and mechanically cut. Therefore, even if the valve structure is not provided in the deaeration hole, the two films in the deaeration hole perform the valve function to maintain the state in which the packaging film is in close contact with the deaerated package for a considerable period of time. You can As a mode of sealing of the present invention, the degassing holes can be sealed by heat sealing after degassing. However, in the case of this heat-sealing method, it takes a lot of time and labor to manually install the separate intermediate packages one by one. The seal of the present invention is
It can also be carried out by providing a valve mechanism inside the deaeration hole, particularly a valve mechanism formed of two films.
When this valve mechanism is provided, it is convenient in that it can be completely sealed, which is almost the same as heat sealing in that it is automatically sealed only by degassing. When naturally sealing with such a valve mechanism, it is not necessary to manually perform the sealing one by one, and even in the deaeration process, a large number of intermediate packages are collectively stored in the decompression chamber and all of them are simultaneously processed. It is efficient in degassing.

The present invention will be described in more detail with reference to the drawings of the embodiments. In the package of the present invention, the gas stove mat shown in FIGS. 1 and 2 has a square flat plate having a circular hole 3 in the center thereof, and the perimeter of the hole becomes a mound 1 at the upper part, resulting in a mound. The back surface of 1 is concave. Since this gas range mat is manufactured by pressing one metal plate, the concave part and the convex part of the other gas range mat fit exactly, so if you stack this gas range mat without packaging it , Mound 1 is on the concave side of another gas range mat stacked on top of Mound 1
And the peripheral edge portion 2 is merely the thickness of two metal plates. However, when this is packaged, the concave surface of the gas stove mat is covered with a packaging sheet to form a planar structure, so that stacking this doubles the thickness of the mound 1, and the stability of the stacked state becomes very poor. The article to which the present invention can be applied is not limited to a square shape such as a gas range mat, and may be circular, elliptical, or any other complicated shape as long as it is a substantially flat plate shape without particular limitation. The package of the present invention can be continuously manufactured using, for example, a planar article having a concave surface on one side and two long thermoplastic resin film sheets. First, a thermoplastic resin film sheet is continuously supplied and a gas range mat, which is the article to be packaged, is placed thereon, and further, a long thermoplastic resin film sheet is continuously supplied on the gas range mat. The product to be packaged is sandwiched between the upper and lower film sheets and sent to the fusing punching table by one-pitch transfer. At this time, a concave surface corresponding to the convex surface of the gas range mat may be provided on the conveyor to be moved in the wack pitch at every distance of the wack pitch, and the gas range mat may be turned upside down and fitted into the concave surface of the conveyor. When the coated article in this state is supplied to the fusing and punching process table by one-pitch transfer, by a fusing and punching blade having a shape in which a convex shape having a width of 1 cm and a height of 5 cm corresponding to the deaeration hole 4 is added to the outer shape of the article. Then, the periphery of the article is melted by punching, the periphery of the article is sealed, and the intermediate package body 5 of FIG. 3 is punched out from the long film sheet. At this time, the peripheral edge 6 of the intermediate package 5 is separated from the long film sheet by fusing and is sealed by fusion. At that time, as for the shape of the fusing punching blade, the degassing hole 4 is formed as shown in FIG. 3 by using a convex part having the shape of the degassing hole 4 provided on one edge of a square slightly larger than the peripheral edge of the gas range mat. To be done. The intermediate package 5 punched out in such a shape by the fusing table moves on the conveyor by one pitch movement and shifts to the depressurizing step. The remaining long film sheet after being punched is detached upward from the package and continuously wound up on a roll. The tip 7 of the deaeration hole 4 of the intermediate package is mechanically cut at a position of 4 cm in height before or after the fusing punching process to separate the deaeration hole tip from the residual film sheet to open the deaeration hole tip. . Therefore, immediately after the tip of the deaeration hole is overlapped and mechanically cut, the two films are physically in close contact with each other, but when the outside air is depressurized from the gap between the films at the tip of the deaeration hole, the internal air is removed. Is discharged. A large number of the intermediate packages thus obtained are collected and housed in a decompression chamber, and the air inside the intermediate package is exhausted by a vacuum pump by a decompression pump. The lower the degree of decompression, the more desirable, but 100 mmHg or less is desirable. When storing in the decompression chamber, the intermediate package of the gas range mat is laminated and pressed by force to discharge a part of the air from the deaeration hole to stabilize the loading state in the decompression chamber and store the decompression chamber to decompress Sometimes the loaded state of the package can be taken out in a compressed form and can be packaged as it is.

When the degassing hole has a valve mechanism, the degassing hole is kept sealed even if the atmospheric pressure is restored when the air is taken out. Even if there is no valve mechanism, the vent hole 4 exerts its valve action by forming the vent hole passage longer than 3 cm or by using a soft thin film material for the vent hole. The packaging film is sufficiently adhered to the surface of the gas range mat, especially the concave surface, until the sheets are stacked and packaged. In this way, since the convex portion of another package can be stored in the concave surface of the package, it is possible to stably store a large number of packages of the same article by stacking them in the same manner as when there is no packaging, and a stacking storage space It can be greatly reduced. As a mode having a valve mechanism of the package of the present invention, a film tape 8 for a valve is provided on the edge of the article to be packaged on the side where the deaeration holes 4 are provided.
And 9 are supplied as shown in FIG. 4, and the peripheral edge of the article is punched out by a fusing punching blade as in FIG.
A valve mechanism 10 composed of two films 8 and 9 can be formed on the inner surface of the film. At this time,
As described above, it is desirable that the film 8 and the film 9 be supplied so that the ends of the substrate portion 2 of the gas range mat are sandwiched from the front and back. The tip end 7 of the deaeration hole 4 having this valve mechanism can be mechanically cut before or after the melting and punching step as in FIG. When the air is degassed by the decompression pump, the sealing of the package is maintained by the valve mechanism without applying heat sealing after the degassing. For deaeration of a package having a valve mechanism in the deaeration hole, it is not necessary to connect a decompression pump to the deaeration hole 4 one by one. The body can be degassed. In the deaeration chamber, the air inside the intermediate package is discharged from the gap of the valve film in the deaeration hole, and when the outside air is returned to normal pressure, pressure is applied to the laminated valve film in the deaeration hole from the outside, and The gap is tightly closed and the depressurized seal is maintained. It is desirable from the viewpoint of the valve mechanism that the film used for the valve mechanism is thinner and softer than the packaging film. For example, usually 10 to 60 μm, preferably 20 to 40
Polyethylene, polypropylene film or the like having a thickness of about μm can be used. In particular, LLDPE or the like, which has good adhesiveness and heat sealability, is desirable as a valve film because it has heat sealability. In addition to the header portion can be attached to the upper edge of the package of the present invention by a conventional method,
In addition, a printing film can be used as the packaging film by a conventional method.

[0008]

EFFECTS OF THE INVENTION Since the package of the present invention is formed by forming a concave surface having the same shape as the article on the package, the stacked state is stable and the volume of the package is significantly reduced when the package is stacked and stored. It is convenient for storage, transportation and display. INDUSTRIAL APPLICABILITY The method for producing the package of the present invention has an advantage that the intermediate package can be continuously produced and the pressure reduction can be efficiently performed.

[Brief description of drawings]

FIG. 1 is a plan view of a gas range mat having a concave surface used in an embodiment of the present invention.

FIG. 2 is a sectional view of a gas range mat used in an embodiment of the present invention.

FIG. 3 is a plan view of an intermediate package with deaeration holes according to an embodiment of the present invention.

FIG. 4 is a partial plan view of an intermediate wrapping body having a valve mechanism in the vent hole of the embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a laminated structure of the valve film of the intermediate package having the valve mechanism of the embodiment of the present invention.

[Explanation of symbols]

 1 Convex part of gas range mat 2 Base part of gas range mat 3 Hole 4 Degassing hole 5 Intermediate package 6 Fusing seal edge 7 Degassing hole tip 8 Valve film 9 Valve film 10 Valve mechanism

Claims (6)

[Claims] 1. An intermediate package formed by sandwiching a flat plate-shaped article having a concave surface with two thermoplastic resin films from the top and bottom, sandwiching the article in a sandwich shape, and thermally fusing the top and bottom two films along the periphery of the article. A degassing hole is provided in a convex shape from one edge of the body, and the degassing hole is sealed so that the thermoplastic resin film facing the concave surface is closely attached to the concave surface along the concave surface. A package characterized by that. 2. The package according to claim 1, wherein sealing is performed by heat-sealing degassing holes. 3. The package according to claim 1, wherein the sealing is performed by a valve structure provided in the deaeration hole. 4. The package according to claim 3, wherein the valve structure is formed by laminating two laminated films inside a deaeration film. 5. A sandwich-shaped flat article having a concave surface between two long thermoplastic resin films is supplied to a fusing punch table by one-pitch transfer, and the article is placed on the fusing punch table. With a fusing punching blade having a shape in which the shape of the deaeration hole is convexly added to the shape corresponding to the peripheral edge of the article, the periphery of the article is punched out and fusion-sealed to once form an intermediate package, and then the intermediate package is degassed. A method of manufacturing a package in which internal air is discharged to maintain a degassing hole in a sealed state. 6. A flat article having a concave surface is sandwiched between two long thermoplastic resin films, and two valve film tapes are provided on the side edges where deaeration holes are provided. The thing laminated on the inside of the film is supplied to the fusing punching table, and the fusing periphery of the article is punched by the fusing punching blade having the shape of the deaeration hole added to the shape corresponding to the peripheral edge of the article, and the fusing is sealed. Lamination of the valve film inside the deaeration hole once forms an intermediate wrapping body, and the intermediate wrapping body is placed in a decompression chamber with the deaeration hole open and deaerated under reduced pressure to discharge the air inside the intermediate wrapping body. A method for manufacturing a package, wherein a degassing hole is automatically sealed by a valve film.