JPS6333829Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a tray packaging body using a stretch film.

[Conventional technology]

Currently, in supermarkets and the like, stretch film overlapping trays are widely used as tray packaging bodies for meat, fish, etc. Various packaging devices are available for this purpose, ranging from manual handle wrappers to fully automatic machines. The basic packaging method common to these packaging devices is to wrap the entire tray with a film, and in particular, to overlap the film in double or triple layers on the back side of the tray, taking advantage of the self-adhesive properties of the film. This method involves sealing the film in sections.
This final packaging form is the same for all machines, only the operations and equipment used to reach it are different.

[The problem that the idea aims to solve]

The above configuration has the following drawbacks.

(a) Layering the films on the back side of the tray is wasteful and unsuitable in the era of resource conservation. Essentially, if the film covers only the top opening of the tray, that purpose is achieved, and conventional packaging formats require three to four times the amount of film originally required.

(b) When overlapping films and sealing them on the back side of the tray, irregular wrinkles inevitably occur, and if the packaged item has a high moisture content, water will flow all the way to the back side of the tray, and the juice will seep out from the wrinkled area, resulting in severe damage. If so, the seal will fall apart.

(c) Since the films are overlapped and sealed on the back side of the tray, it is difficult to see through the packaged items from the back side even if a transparent tray is used.

(d) In this form, the film is squeezed at the bottom of the tray, so it is difficult to spread the film over the opening of the tray without wrinkles, and this may be affected by changes in the air (room) temperature in the packaging room or the size of the tray used. Depending on the type, etc., the conditions change slightly, which tends to always cause trouble.

In the present invention, the peripheral edge of a stretch film that covers the upper opening of the tray is adhered to the upper outer surface of the peripheral wall of the tray using an adhesive, and the stretch film is cut at the lower side of the adhesive part to remove the stretch film. The aim is to significantly reduce the amount of tutsifilm used.

[Means to solve the problem]

In order to achieve the above object, the tray packaging body using the stretch film of the present invention has a flat bottom plate,
It has a peripheral wall that expands and slopes upward from the periphery of the bottom plate and extends integrally, and an adhesive-applied surface formed all around the upper outer surface of the peripheral wall, and when a large number of units are stacked in an unpackaged state, A tray in which each adhesive-applied surface is exposed continuously in the vertical direction to form a columnar shape as a substantially vertical surface, an object to be packaged placed in the tray, and an opening on the upper surface of the tray overlap each other. and a stretch film having a peripheral edge bonded to the adhesive-coated surface of the tray with an adhesive, and the stretch film has its peripheral edge adhered to the adhesive-coated surface of the tray. The cut was made around the entire circumference at the lower side approaching the position.

[Effect]

Stack a large number of unpackaged trays, expose the adhesive-coated surface of each tray continuously in the vertical direction, apply adhesive to the adhesive-coated surface of all trays at once using a roller, etc. After the trays are individually separated and filled with items to be packaged, the upper opening of the tray is covered with a stretch film, the periphery of the stretch film is adhered to the adhesive-coated surface of the tray, and the stretch film is applied to the underside of the adhesive part. Cut the authifilm.

〔Example〕

8 and 9 show longitudinal cross-sectional views of the tray packaging body according to the present invention, where 15 is a tray, 19 is a
4 is a packaged article, and 4 is a stretch film.

The tray 15 includes a flat bottom plate 15a and a bottom plate 15.
It has a peripheral wall 15b that expands and slopes upward from the periphery of the peripheral wall 15b and extends integrally, and an adhesive application surface 15c formed on the entire circumference of the upper outer surface of the peripheral wall 15b.In particular, the adhesive application surface 15c is When a large number of trays are stacked in an unpackaged state, the adhesive applied surface 15c of each tray 15
is continuously exposed in the vertical direction and is formed to have a columnar shape as a substantially vertical surface.

In FIGS. 6 and 8, the tray 15 is connected to the peripheral wall 1.
7 and 9, the upper peripheral edge of the tray 15 is folded back outward to form the adhesive applied surface 15c. In FIGS. The figure shows the case where .

In either case, Figure 10 A, B, C or 1
As shown in Figure 1 A, B, and C, with many unpackaged trays stacked on top of each other, the adhesive-applied surface 15c
is formed so that it is exposed continuously in the vertical direction and has a columnar shape as a substantially vertical surface, and in this state, the adhesive 18 can be applied with a uniform thickness by a roll or spray. Form.

FIGS. 10B and 11B and 11B and C above show cases where the adhesive application surface 15c is inclined, or where a slight gap occurs when they are overlapped.

The stretch film 4 overlaps and covers the upper surface opening of the tray 15, and its peripheral edge is adhered to the adhesive-coated surface 15c of the tray 15 via the adhesive 18.
It is cut around the entire circumference at the lower side close to.

Next, as an example of a packaging method for obtaining the above-mentioned package, an improved method of the structure as shown in Japanese Utility Model Application No. 52-104756 proposed by the present applicant may be used. Specifically, in an embodiment, a stretch film is catalytically heated to a certain temperature (film softening temperature). As a result, heating is always performed in an optimum state regardless of the room temperature of the packaging room, and since contact heating is used, the film reaches its softening temperature in a short heating time. In this case, if you keep the temperature of the heater below the softening point of the film, even if the arranging process is laborious and overheats the film for a long time, the film will not overheat unnecessarily. No burn-in or the like will occur. In this case, a heating plate is used, and as shown in Fig. 1, this heating plate is a hollow thin box-shaped heating plate 1 made of a metal with good thermal conductivity, and a heater 2 is placed inside the heating plate 1. A suitable number of the heating plates 1 are arranged at equal intervals, and a large number of small holes 3 are bored in the lower surface of the heating plate 1, and the lower surface 1a, which serves as the heating surface, is coated with Teflon resin to prevent the film 4 from being baked. In addition, the heating plate 1
An intake pipe 5, which is connected to a vacuum pump (not shown) via a switching valve, is connected to the upper part of the intake pipe 5.

Only when heating the film 4, the switching valve is connected to a vacuum pump to act on intake air into the heating plate 1 through the intake pipe 5, sucking the film 4 through each small hole 3, and heating the film 4. The air between the film 4 and the heating plate 1 is removed by suction and
(a) That is, the film 4 is brought into close contact with the entire surface of the heating surface and heated to its softening point in a short period of time. When heating is completed, the valve is opened to the atmosphere or the film 4 is actively released using exhaust gas.

Since the film 4 is a stretch film, it has the property of shrinking in the vertical and horizontal directions when heated. Therefore, the periphery of the film 4 is held between two upper and lower holding frames 6 and 7 having internal dimensions slightly larger than that of the heating plate 1, and the film 4 is moved toward the heating plate 1 to heat the film 4. This prevents the film 4 from shrinking in the vertical and horizontal directions.
Heats up well.

The heating plate 1 is fixed to the upper part of a packaging machine used to implement this invention, while the film holding frames 6 and 7 are configured to be movable up and down. The film holding frames 6 and 7 are constructed so that they can be opened and closed independently to hold the film 4 therebetween.

The mounting table 8 is horizontally attached to the machine base in correspondence with the heating plate 1 and the film holding frames 6 and 7, and is provided with a large number of intake holes 9, and an intake chamber 11 is formed by a covering box 10 attached to the lower surface. And this intake chamber 1
1 is connected to an intake pipe 12 which is connected to a vacuum pump via a switching valve. A frame 13 is fixed around the upper surface of the mounting table 8, and the outer dimensions of the frame 13 are slightly smaller than the inner dimensions of the film holding frames 6 and 7.

The cutting frame 14 placed on the mounting table 8 is formed of an electrically insulating material such as asbestos so that a tray 15 can be fitted therein, and a resistance wire 16 such as a nichrome wire is stretched on the outer peripheral side of the cutting frame 14. , resistance line 1
Intake holes 17 are provided at appropriate intervals along the position immediately below the air intake hole 6 .

The tray 15 has an adhesive 18 coated on its outer circumferential surface, and the adhesive 18 is preferably an EVA resin type adhesive that has good adhesion to the stretch film 4.
The material of the tray 15 may be PSP (polystyrene paper), OPS (biaxially oriented polystyrene sheet), etc., which are commonly used in plastics.

In the packaging operation, the film 4 is cut from a roll or the like to an appropriate length, held between the film holding frames 6 and 7, and brought into close contact with the heating plate 1 to be heated and softened. Then, the articles 19 to be packaged are placed on the tray 15, fitted into the cutting frame 14, and placed on the mounting table 8. (See Figure 1) Next, the film holding frames 6 and 7 are lowered to overlap the heated and softened film 4 on the tray 15, and then air is generated in the intake chamber 11 to move the film 4 around the tray 15 and around the tray 15. It is brought into close contact with the periphery of the cutting frame 14. In this case, due to the presence of the frame 13 around the mounting table 8, the film 4 is shielded from the outside air as shown in FIG. Closely adhere as shown. In particular, the intake holes 17 around the cutting frame 14
This ensures that the film 4 is in close contact with the resistance wire 16 on the outer peripheral surface of the tray 15 and the outer peripheral surface of the cutting frame 14.

Next, the resistance wire 16 around the cutting frame 14 is energized,
Film 4 is melted. As a result, the film 4 is cut along the periphery of the tray 15.

When the cutting is completed in this way, the resistance wire 16
At the same time, the suction action to the suction chamber 11 is also stopped, and the film holding frames 6 and 7 are moved upward. At this time, the excess film around the tray 15 is removed and discarded, and the film-wrapped tray 15 remains on the mounting table 8, which is taken out and the next wrapping is performed again according to the above procedure.

As shown in FIGS. 4 and 5, the cutting frame 14 is made by forming a tray fitting frame part 14b of an electrical insulating material such as asbestos on a frame-shaped substrate 14a, and stretching a resistance wire 16 around the outer periphery of the tray fitting frame part 14b. and an air intake hole 17 is formed around the substrate 14a. Although only one cutting frame 14 is shown, a large number of cutting frames 14 may be arranged vertically and horizontally.

The tray 15 has a shape as shown in FIGS. 6 and 7, and has an adhesive 18 applied to its outer peripheral surface. The adhesive 18 may be applied by stacking a large number of trays and applying the adhesive all at once using a roll or the like.

The presence of the adhesive 18 ensures complete adhesion of the film 4 to the periphery of the tray 15. Since the film 4 is softened, it becomes self-adhesive, and the adhesion to the periphery of the tray 15 due to the suction action provides a perfect seal with no wrinkles. A perfect seal is maintained.

[Effect of idea]

This device has a flat bottom plate, a peripheral wall that expands upward from the periphery of the bottom plate and extends integrally, and an adhesive-applied surface formed all around the upper outer surface of the peripheral wall, and is in an unpackaged state. a tray formed so that when a large number of adhesives are stacked, each adhesive coated surface is continuously exposed in the vertical direction and presents a columnar shape as a substantially vertical surface; and an object to be packaged placed in the tray; Overlapping and covering the top opening of the tray,
and a stretch film having a peripheral edge bonded to the adhesive-coated surface of the tray via an adhesive, the stretch film having a peripheral edge,
Since the film is cut around the entire circumference near the adhesive-applied surface of the tray, the amount of film used can be reduced, and the periphery of the film can be adhered around the tray in a beautiful manner without wrinkles. The presence of adhesive ensures a perfect seal;
There is no leakage of liquid, and since the melting is done by energizing the resistance wire, there is no material that dulls the edge of the cutting edge, which is the case with knives, and it is always possible to cut stably, reliably, and beautifully, and it is easy to package. When using a transparent tray, the product can be clearly seen from the back side, and since the film is heated, it can be stored at all times, regardless of the room temperature of the packaging room in warm or cold regions. Good packaging is achieved, and since the periphery of the film is sandwiched between frames, there is no shrinkage and the packaging can be done well.

[Brief explanation of the drawing]

Figures 1 to 3 are explanatory diagrams of the packaging order of the package according to the present invention, Figure 4 is a sectional view of the cutting frame, Figure 5 is a perspective view thereof, and Figures 6 and 7 are adhesives on the tray. FIG. 8 and 9 are longitudinal sectional side views of the tray packaging body according to the present invention, and FIGS. 10A, B, and C, and FIGS. 11A,
B and C are cross-sectional views showing a modified example of the polymerized state of the tray and its adhesive application state. 4...Film, 15...Tray, 15a...
Bottom plate, 15b... Peripheral wall, 15c... Adhesive coated surface, 18... Adhesive, 19... Item to be packaged.

Claims (1)

[Scope of Claim for Utility Model Registration] A flat bottom plate, a peripheral wall that expands and slopes upward from the periphery of the bottom plate and extends integrally, and an adhesive-applied surface formed all around the upper outer surface of the peripheral wall. and a tray formed such that when a large number of adhesives are stacked in an unpackaged state, each adhesive coated surface is continuously exposed in the vertical direction and presents a columnar shape as a substantially vertical surface; It consists of an item to be packaged, and a stretch film that overlaps and covers the upper opening of the tray and has a peripheral edge bonded to the adhesive-coated surface of the tray via an adhesive, and the stretch film is A tray packaging body made of a stretch film, characterized in that its peripheral edge is cut around the entire circumference at the lower side near the position where it is bonded to the adhesive-applied surface of the tray.