JPH1159634A - Method and device for packaging - Google Patents

Abstract

PROBLEM TO BE SOLVED: To certainly package a packaging article in a short period of time with a simple device even with a film that is inferior in self-stickiness. SOLUTION: A beltlike sticking film 14, wound up in a roll, is rotatively set on a case body 12 that is being a main body. The film 14 is biaxially oriented film made of polyolefine material such as polyethylene, polypropylene or the like. A flat working table 18 is provided at the side in the direction wherein the film 14 is drawn out, and a cutter 20 for cutting the film 14 by heat is provided at the edge on the side of the working table 18, intersecting at right angles the direction of drawing-out of the film 14. A heating plate 24 formed in a concave contacting simultaneously with the bottom and the two sides connecting to the bottom of a packaging article 22 is provided at the side of the working table 18, and a heater 25 for heating the heating plate 24 is provided at the reverse side of the heating plate 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging method and an apparatus for wrapping an object to be packaged with a synthetic resin film and fixing the film by thermocompression bonding.

[0002]

2. Description of the Related Art Conventionally, trays or the like which generally contain food and are displayed at stores have been packaged with a vinyl chloride film. As shown in FIGS. 7 and 8, a packaging device used for this packaging is provided with a rolled film 3 on a main body 2 of a manual packaging device 1, and the film 3 is free in the axial direction. Are mounted on the two rollers 4 that rotate. A worktable 5 having a flat upper surface is provided in front of the film 3 withdrawal direction, and a cutter for cutting the film 3 by heat is provided near a side edge of the worktable 5 orthogonal to the film 3 withdrawal direction. 6 are provided in parallel. A flat heating plate 7 is provided in front of the worktable 5 in the drawing direction of the film 3, a heater 9 for heating the heating plate 7 is provided on the back side of the heating plate 7, and a cutter 9 is provided inside the main body 2. A control device (not shown) for raising and controlling the temperature of the heating plate 6 and the heating plate 7 is provided.

[0003] A method of using the packaging apparatus 1 is to place a tray 8 containing foods or the like to be packaged on a work table 5, pull out the film 3, and cover the tray 8. The tray 8 is lifted together with the film 3, the film 3 is brought into contact with the cutter 6, and cut at an appropriate position. On the bottom surface of the tray 8, the cut end of the film 3 and the other end parallel to this end are overlapped, and the films 3 projecting from both sides of the tray 8 are folded thereon. And tray 8
Is pressed against the heated heating plate 7 and thermocompression-bonded, and the overlapped portions of the film 3 are heated and adhered to each other by self-adhesion to be packed.

[0004]

In the case of the above-mentioned prior art, as the film 3, a stretched film made of vinyl chloride having good self-adhesiveness and transparency was mainly used. However, since toxic substances such as dioxin are generated during incineration of vinyl chloride, films that are relatively free of polyolefin-based harmful substances such as polyethylene are required for packaging films. Has also been put to practical use. However, a polyolefin-based film has low self-adhesiveness, and a packaging device such as the conventional manual packaging device 1 requires long-time thermocompression bonding at the end of the film end,
There was a problem that work efficiency was poor. In addition, since the self-adhesiveness is weak, it was necessary to stop the end portion with cellophane tape in order to reliably prevent the opening of the folded portion of the film.

[0005] In terms of transparency, a polyolefin-based film can have the same transparency as a vinyl chloride film by biaxial stretching. However, this polyolefin-based stretched film could not obtain sufficient self-adhesiveness.

The present invention has been made in view of the above-mentioned problems of the prior art, and enables a simple apparatus to reliably package an object to be packaged in a short time even with a film having poor self-adhesiveness. It is an object to provide a packaging method and apparatus.

[0007]

SUMMARY OF THE INVENTION A packaging device according to the present invention comprises:
A band-shaped self-adhesive film wound in a roll shape is provided on a box as a main body, and the film is mounted on two rollers that freely rotate in the axial direction. The film is a biaxially stretched film of a polyolefin such as polyethylene and polypropylene. A flat workbench is provided on the side of the film drawing direction, and a cutter for cutting the film by heat is orthogonal to the side of the side edge of the worktable with respect to the film drawing direction. It is provided. Furthermore, on the side of the work table, a heating plate formed in a concave shape is provided which is simultaneously in contact with the bottom surface of the object to be packaged and two side surfaces continuous on both sides of the bottom surface. A heater for heating the heating plate is provided.

[0008] A self-adhesive film made of a synthetic resin in the form of a roll wound in a roll shape, a flat work table formed in the drawing direction of the film, and A cutter for the film orthogonal to the drawing direction of the film, and a heat cutter for cutting the film protruding on both sides of the packaged object in the vicinity of the packaged object and welding the cut surface thereof. Packaging device.

[0009] Below the heating plate, there is provided a conveyor belt whose surface is heated to a predetermined temperature and heats while transporting the article to be packaged. The conveyor belt passes through the inside of the main body, and the inside of the main body is It is a heat tunnel covered with thermal insulation and fitted with a fan.

[0010] In the packaging method using the packaging apparatus of the present invention, the packaged object is first wrapped in a cylindrical shape by closely contacting the packaged material in one direction with a polyolefin-based film wider than the packaged product. On two side surfaces continuous with both sides of the bottom portion, an overlapping portion in which each end of the film has two layers is located. Then, the bottom surface and the side surface of the article to be packaged are pressed against the heating plate heated to a predetermined temperature and thermocompression-bonded to bring the overlapping portions of the films into close contact with each other. Next, the films protruding on both sides of the package are folded on the bottom surface of the package, and at this time, an overlapping portion in which the film has a plurality of layers is located on the bottom surface of the package. I have. Then, the packaged object is placed on the conveyor belt heated to a predetermined temperature, and the bottom surface of the packaged object is heated to make the overlapping portion of the film more closely contact.
Further, the transport belt places the article to be packaged thereon and passes through the heat tunnel, and the film thermally contracts and comes into close contact with the article to be packaged.

Further, according to the present invention, an object to be packaged is wrapped in a cylindrical shape with a self-adhesive film made of synthetic resin wider than the object to be packaged in one direction. The overlapping portion of each end is located, the bottom surface of the packaged object is pressed against a heating plate heated to a predetermined temperature and heated to bring the overlapping portions of the film into close contact with each other,
The film protruding from both sides of the package is cut by a heat cutter or the like near the package, the end surfaces thereof are welded, and the film of the package packed by the film is heated. This is a shrinking packaging method.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 4 show a first embodiment of the present invention. A packaging device 10 of this embodiment has a box 12 on an outer surface, and is wound in a roll above the box 12. Band-shaped self-adhesive polyolefin film such as polyethylene or polypropylene 1
4 are provided, and the film 14 is placed in parallel with two rollers 16 freely rotating in the axial direction.

A flat work table 18 is provided on the side of the film 14 in the drawing direction, and a cutter 20 for cutting the film 14 by heat is provided near the work table 18.
4 are provided orthogonal to the drawing direction. Further, on the side of the cutter 20, a tray 22 which is
Is provided with an aluminum heating plate 24 for heating. The tray 22 is dish-shaped, and has a rectangular bottom surface 22a and a bottom surface 2a.
It is formed from four trapezoidal side surfaces 22b formed obliquely outward with respect to 2a. And the heating plate 24
Is a concave portion 2 having a central portion along the bottom surface 22a of the tray 22 and two side surfaces 22b formed continuously on both sides of the bottom surface.
6 are formed, and both ends of the concave portion 26 are substantially flat flat portions 2.
8 are formed. On the back surface at the center of the heating plate 24,
A heater 25 for heating the heating plate is provided. An electrical box 30 having a control device for raising and controlling the temperature of the cutter 20 and the heater 25 to a predetermined temperature is provided inside the box 12.

A transport belt 32 for heating the tray 22 while transporting the tray 22 is provided below the inside of the box 12 in parallel with the drawing direction of the film 14. The transport belt 32 is a belt-shaped belt formed into an annular shape.
It is moved at a constant speed by a drive motor 48. A heater 50 for heating the transport belt 32 is provided inside the annular transport belt 32. And box 12
Is provided with a heat tunnel 34 through which the conveyor belt 32 passes. A heat insulating material 36 is placed on the inner upper surface and each side surface of the heat tunnel 34, and a fan 38 is provided at the center of the upper surface. The fan 38 is connected to a fan motor 40 provided on the upper surface of the box 12. A curtain 4 is provided at the entrance 42 and the exit 44 of the heat tunnel 34, respectively.
6 are suspended.

Next, a packaging method using the packaging apparatus 10 of this embodiment will be described with reference to the drawings. The packaged items are
This is a tray 22 for storing foods and the like. First, the tray 22 is placed on the worktable 18. Then, the film 14 is pulled out and put on the upper surface of the tray 22, and the tray 22 is
The film 14 is lifted, and the film 14 is cut by bringing an appropriate position of the film 14 into contact with the cutter 20. The cut end of the film 14 and the other end parallel to this end are overlapped on the bottom surface 22 a of the tray 22 to form the film 14 into a tubular shape. At this time, the bottom surface 22a of the tray 22 and the bottom surface 2
On two side surfaces 22b that are continuous on both sides of 2a, an overlapping portion in which each end of the film 14 has two layers is located.

Then, the tray 22 is pressed against the concave portion 26 of the heating plate 24 heated to a predetermined temperature and thermocompression-bonded. The bottom surface 22a of the tray 22 and the side surfaces 22b on both sides continuous with the tray 22 abut against the concave portion 26 without any gap, and the two-layer overlapping portions of the films 14 adhere to each other by welding. Further, the films 14 projecting from both sides of the tray 22 are also thermocompression-bonded to the flat portion 28 at the same time, and the two-layered overlapping portions 14 located at this portion are also adhered to each other by welding.

Next, the tray 2 is placed on the bottom surface 22a of the tray 22.
The films 14 protruding from both sides of the tray 2 are folded, and at this time, on the bottom surface 22a of the tray 22, an overlapping portion where the film 14 has a plurality of layers is located. And tray 2
2 is placed on a conveyor belt 32 heated to a predetermined temperature. At this time, the overlapping portion where the film 14 has a plurality of layers is thermocompressed under its own weight of the tray 22, and is welded and adhered to each other. The tray 22 is further heated by the transport belt 32 while passing the heat tunnel 34 from the entrance 42 to the exit 44, and causes the film 14 to thermally contract and adhere to the tray 22. Note that this heat tunnel may be omitted if it is not necessary to pass the heat tunnel, and the film 14 securely adheres to itself by the thermocompression bonding.

According to this packaging method and apparatus, it is possible to attach the polyolefin-based films 14, which are difficult to thermocompression-bond due to low adhesiveness, to the tray 22 in a short time and with a simple apparatus. It is possible. Therefore, it is not necessary to stop the film 14 with reinforcement to prevent the film 14 from opening, and the packaging operation is simple. And
Instead of a vinyl chloride film that generates harmful dioxins and the like, a polyolefin-based film can be used, and the effect on the environment can be reduced.

Next, a second embodiment of the present invention will be described with reference to FIGS. Here, the same members as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.
The packaging device 48 of this embodiment is also provided with a flat work table 18, and a cutter 20 is provided near the work table 18. Further, on the side of the cutter 20, an aluminum heating plate 50 for heating the tray 22 is provided as shown in FIG. At both ends of the heating plate 50, a pair of heat cutters 52 for cutting the film 14 by heat are provided.
The heat cutter 52 is provided in parallel with the drawing direction of the film 14, and simultaneously welds and cuts the end face with a hot blade or a nichrome wire.

On both sides of the heat cutter 52, film cladding plates 54 are provided in parallel with the heat cutter 52. The film clad plate 54 is, for example, a spring 56
The elastic member is normally provided so as to protrude above the cutting edge of the heat cutter 52 and to be able to be slightly pushed down below the edge of the heat cutter 52.

Next, a packaging method using the packaging device 48 of this embodiment will be described with reference to FIG. First, the tray 22 is placed on the worktable 18. Then, the film 14 is pulled out and put on the upper surface of the tray 22, the tray 22 is lifted together with the film 14, and an appropriate position of the film 14 is brought into contact with the cutter 20 and cut. Then, the cut end of the film 14 and the other end parallel to this end are overlapped on the bottom surface 22a of the tray 22 to form the film 14 into a tubular shape.

Then, the tray 22 is pressed against the heating plate 50 heated to a predetermined temperature and thermocompression-bonded. At this time, the film 14 first comes into contact with the film covering plate 54, and is pressed down against the elastic force of the spring 56, so that the film 14 is given an appropriate tension and approaches the heat cutter 52. Further, at this time, the two layers of the film 14 adhered to each other are brought into close contact with each other, and in this state, the two films 14 abut against the heat cutter 52 and are reliably and cleanly fused and welded.

Thus, the bottom surface 22a of the tray 22
The films 14 in the layered overlapping portion are adhered to each other by welding. Then, the films 14 projecting from both sides of the tray 22 are cut into contact with the cutter 52. Next, the tray 22 is placed on the conveyor belt 32 heated to a predetermined temperature.
The layered portions are thermocompression bonded and adhered to each other by welding. The tray 22 is further heated by the transport belt 32 while passing the heat tunnel 34 from the inlet 42 to the outlet 44, and the film 14 is thermally shrunk to
2

According to the packaging method and the apparatus 48 of this embodiment, the film 14 placed on the bottom surface 22a of the tray 22
Is relatively thin, can be securely adhered to each other, and has stability even when transferred to a display shelf or the like and stacked. Since the film 14 is fused and welded on both sides of the tray 22, the film 14 does not peel off and has a good appearance.

Note that the packaging apparatus of the present invention is not limited to the above embodiment, and the shape of the heating plate can be freely designed in accordance with the shape of the tray and other objects to be packaged. As the material of the film, a material other than polyolefin such as polyethylene can be used, and a conventional vinyl chloride film can also be used for the packaging device of the present invention.

[0026]

According to the packaging method and apparatus of the present invention, a film having low adhesion, such as polyethylene, can be securely and quickly attached to an object to be packaged by a simple operation.

[Brief description of the drawings]

FIG. 1 is a perspective view of a packaging device according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a heating plate of the packaging device according to the embodiment.

FIG. 3 is a longitudinal sectional view of the packaging device of the embodiment.

FIG. 4 is a partially cutaway right side view of the packaging device of this embodiment.

FIG. 5 is a sectional view of a heating plate of the packaging device according to the second embodiment of the present invention.

FIG. 6 is a partial perspective view of a packaging device according to a second embodiment of the present invention.

FIG. 7 is a perspective view of a conventional packaging device.

FIG. 8 is a right side view of a heating plate of the conventional packaging device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Packaging apparatus 12 Box 14 Film 18 Working table 20 Cutter 24 Heating plate 26 Concave part 32 Conveying belt 34 Heat tunnel

Claims (6)

[Claims] 1. An object to be packaged is wrapped in a cylindrical shape with a self-adhesive film made of synthetic resin wider than the object to be packaged in one direction, and continuous on the bottom surface of the object to be packaged and on both sides of the bottom surface. The overlapping portion of each end of the film is located on the two side surfaces, and the bottom portion and the side surface of the packaged object are pressed against a heating plate heated to a predetermined temperature and heated to overlap the overlapping portions of the film with each other. The package is folded on the bottom surface of the packaged object, and the film protruding on both sides of the packaged product is folded on the bottom surface of the packaged product. A packaging method, wherein an overlapping portion of the film on the bottom surface of the packaged object is heated to bring the overlapping portions into close contact with each other. 2. The packaging method according to claim 1, wherein the film is a stretched film made of a polyolefin-based resin, and the film is heat-shrinked after packaging an object to be packaged with the film. 3. A package to be packaged is wrapped in a cylindrical shape with a self-adhesive stretched film made of synthetic resin wider than the package to be adhered in one direction, and the bottom of the package is covered with the film. The overlapping portion of each end is located, the bottom surface of the package is pressed against a heating plate heated to a predetermined temperature and heated to bring the overlapping portions of the film into close contact with each other, and on both sides of the package. A packaging method, wherein each of the protruding films is cut in the vicinity of the object to be packaged, the end faces thereof are welded, and then the film surrounding the object to be packaged is thermally shrunk. 4. A self-adhesive film made of a synthetic resin in the form of a belt wound in a roll, a flat work table formed in a direction in which the film is drawn out, and a side edge portion of the work table. It is characterized by comprising a cutter for the film orthogonal to a drawing direction of the film, and a heating plate formed in a concave shape that simultaneously abuts a bottom surface of the packaged object and two side surfaces that are continuous on both sides of the bottom surface. And packaging equipment. 5. A self-adhesive film made of a synthetic resin wound in a roll shape, a flat work table formed in a drawing direction of the film, and a side edge of a side edge of the work table. A cutter for the film orthogonal to a drawing direction of the film, and a heat cutter for cutting the film protruding on both sides of the packaged object in the vicinity of the packaged object and welding a cut surface thereof. A packaging device, characterized in that: 6. The film is a stretched film made of a polyolefin-based resin, and is provided with a transport belt that transports the packaged object and has a surface heated to a predetermined temperature, and a heat tunnel through which the transport belt passes. The packaging device according to claim 5, wherein the film is heat-shrinked.