JPS5840002Y2 - Packaging equipment for tray-plated items - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for wrapping a serving surface of a tray with a film, particularly a stretch film.

BACKGROUND ART At present, trays with overlapping stretch films are widely used for packaging meat, fish, etc. in supermarkets and the like.

A variety of packaging machines are available for this purpose, ranging from a manual so-called hunt wrapper to a fully automatic machine.

The basic packaging method common to these packaging devices is to wrap the entire tray in a film, then overlap the film in double or triple layers, especially on the back side of the tray, and take advantage of the film's self-adhesive properties. This is to seal the film.

However, packaging in such a form has various drawbacks as follows.

(a) Layering films on the back side of a tray is wasteful and is not suitable for the era of resource conservation.

Essentially, the top film achieves its purpose as long as it covers only the upper opening of the tray, and conventional packaging means require three to four times the amount of film originally required.

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

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

(d) Stretching the film over the tray opening without wrinkles can be a constant source of trouble as conditions vary slightly depending on changes in the air (room) temperature in the packaging room, the type of tray used, etc. .

Therefore, the inventor of the present invention has already devised and disclosed numerous film packaging methods and devices, including in JP-A No. 51-36387. Although it is said that because the heating means and the packaging position are in the same position, the thermal influence of the heating means on the packaged product is less than before, but it has not been completely eliminated yet. However, even in this case, there are still points that need to be improved in terms of how to bring the heated film from the heating position to the packaging position. In order to cut the excess film at the periphery, there is a problem that this must be done at a position other than the above-mentioned position, and these problems remain to be improved in the future.

The present invention aims to improve some of the above-mentioned problems and to further improve the simplicity of the device and the ease of work.

The gist of the present invention is to set the film heating position and packaging position at different positions, and to set the packaging position and cutting position at the same position, and to move the film heated at the heating position from the packaging cutting position. The point is that the film holding frame is used to hold the film properly.

The specific structure of this invention will be briefly explained below with reference to the drawings.

In FIGS. 1 and 2, 1 is a base, 2 is a roll of stretch film 4 rotatably supported on one side of the base 1 by a suitable means such as a roller 3, and 5 is the base. This is a heating plate installed at a predetermined position on the table 1. This is formed into a hollow thin box shape from a metal with good thermal conductivity, and an appropriate number of heaters (not shown) are arranged inside the heating plate. There is.

The upper surface of the heating plate 5 may be coated with Teflon resin to prevent the film 4 from sticking, or may be provided with a large number of small holes 6.

Reference numeral 7 denotes a receiving frame installed to surround the heating plate 5, and a member (not shown), such as cotton cloth, to which the film 4 does not stick is pasted to the upper end surface 7' of the receiving frame.

Reference numeral 8 denotes a presser frame circumferential guide plate fixed to the base 1 at symmetrical positions on both sides of the receiving frame 7, and a long hole 9 is formed in the longitudinal direction of the presser frame circumferential guide plate.

Reference numeral 10 denotes a film holding frame having a support rod 11 on one side and having the same size as the receiving frame 7. This frame can be opened and closed by slidably supporting both sides of the support rod 11 in the elongated holes 9 of the guide plate 8. A member (not shown), such as a vinyl tape, etc., which temporarily adheres well to the film 4, is attached to the lower end surface 10' which abuts the upper end surface 7' of the receiving frame.

Reference numeral 12 designates handles fixedly attached to both ends of the film holding frame 10 on the other side.

Reference numeral 13 denotes a frame for storing a cutting frame, which is provided on the other side of the base 1 adjacent to the receiving frame 7, and the outer dimensions of this frame 13 are slightly smaller than the inner dimensions of the film holding frame 10. be.

14 is a cutting frame provided within this frame 13, which is
A tray 16 is formed of an electrically insulating material such as asbestos onto a substrate 15 fixed at a predetermined height on the inner surface of the frame 13, and a resistance wire 17 such as a nichrome wire is attached to the outer peripheral surface of the substrate 15. is stretched, and a large number of air intake holes 19 communicating with the air intake chamber 18 are bored in predetermined portions of the substrate 15.

A microswitch 20 is fixed at a predetermined external position along the frame 13, and when the switch 20 is turned on, the resistance wire 17 is energized.

The intake chamber 18 communicates with an intake pipe 21 that is connected to a vacuum pump via a conduit.

Further, the tray 16 has an adhesive (not shown) applied to its outer peripheral side surface, and this adhesive is preferably an EVA resin type adhesive that has good adhesion to the stretch film 4.

The material of the tray 16 may be PSP (polystyrene paper), OPS (biaxially oriented polystyrene seal), etc., which are commonly used plastics.

Next, the packaging procedure using the device of the present invention will be explained.

First, as shown in FIG. 2a, the tray 16 on which the to-be-wrapped v021 is placed is fitted into the cutting frame 14.

After the stretch film 4 is pulled out from the film roll 2 onto the heating plate 5, the film holding frame 10 is closed and brought into contact with the receiving frame 7, and the film 4 is held between the frames 7 and 10.

After that, the film 4 is heated to a constant temperature (
Contact heat to (film softening temperature).

As a result, heating is always carried out in the optimum state regardless of the room temperature of the packaging room, and since contact heating is used, the heating time of the film 4 is short (approximately 3 to 4 seconds) and the softening temperature (approx. 120 to 130°C is optimal).

In this case, if the temperature of the heating plate 5 is kept below the softening point of the film 4, the work of placing the film on the tray 16 will be troublesome and the film 4 will be heated for a long time. Also, the film 4 is not heated more than necessary, and problems such as burn-in do not occur.

Moreover, it goes without saying that the heating temperature and heating time vary depending on the properties of the film or its thickness.

Furthermore, the stretch film 4 has the property of shrinking vertically and horizontally when heated, but as mentioned above, the stretch film 4
Since the periphery is held between the receiving frame 7 and the presser frame 10,
It heats up well without shrinking vertically or horizontally.

When heating is finished, hold the handle 12 and remove the film presser frame 1.
0 as shown in Figure 2, lift the front end side and attach the guide plate 8.
is moved toward the cutting frame 14 along the elongated hole 9. At this time, a film adhesive member is attached to the end face 10' of the film holding frame, and a non-adhesive member is attached to the upper end face 7' of the receiving frame. Therefore, the heated film 4 is transferred to the film presser frame 10.
The stretch film 4 is conveyed to the cutting frame 14 while remaining attached to the film, and at the same time, a new stretch film 4 is drawn out from the film roll 2 onto the heating plate 5.

Then, the film presser frame 10 with its front end raised as described above is fitted around the cutting frame storage frame 13 as shown in FIG. 2C, and the heat-softened film 4 is overlapped on the tray 16. After that, the air is generated in the air intake chamber 18 to move the film 4 around the tray 16 and the cutting material 14.
Place it in close contact with the surrounding area.

In this case, the film 4 is shielded from the outside air by the presence of the frame 13 around the substrate 15, and the film 4 is brought into close contact with the film 4 by the suction action from the air intake holes 19 as shown in FIG. 2C.

As a result, the film 4 is adhered to the outer circumferential surface of the tray 16 with the adhesive, and is also firmly attached to the resistance wire 17 on the outer circumferential surface of the cutting frame 14.

At the same time, due to the fitting operation of the film holding frame 10, the microswitch 20 is pressed by its lower end surface 10' and turned ON, and the resistance wire 17 is energized for a predetermined time (about 0.5 seconds), and the film 4 is It will be fused.

Thereby, the film 4 is cut along the periphery of the tray 16.

When the cutting is completed in this manner, hold the handle 12 and lift the film presser frame 10 upward.

Then, the surrounding excess film 4 is attracted to the cutting frame 14 by the suction action, and is separated from the end face 10' of the film holding frame.

Thereafter, the excess film 4 is thrown away, and the wrapped tray 16 remaining on the substrate 15 of the cutting frame 14 is taken out.

Then, the film presser frame 10 lifted upward as described above is moved toward the heating plate 5 side along the elongated hole 9 of the guide plate 8, and its lower end surface 10' is brought into contact with the upper end surface 7' of the receiving frame. Then, the film 4 that has already been pulled out onto the heating plate 5 is held between the frames 7 and 10.

Thereafter, the packaging operation is repeated in the same manner as above. In the above embodiment, a stretch film was used as the packaging film, but the film that can be used in the device of the present invention is not limited to this, and it is of course possible to use various other films. .

However, in that case, the lower end surface 10' of the film holding frame 10
In order to hold and fix the film, for example, a large number of needle-shaped protrusions are provided to protrude downward, and holes into which the protrusions fit are provided in the receiving frame 7, so that it can be used for films other than stretch films. can.

As explained above, the present invention is capable of placing a heating plate, a film heating work part that is equipped with a receiving frame surrounding the heating plate and having a non-adhesive upper surface, and a tray on a common base. A cutting frame with a resistance wire stretched around its outer periphery, a cutting frame storage frame for storing the cutting frame, and a cutting frame storage frame that is attached to the frame housing, has an intake chamber at the lower part, and has the cutting frame placed on the upper surface, In addition, a packaging cutting section equipped with a substrate having an air intake hole is arranged in parallel, and the shape is the same as the receiving frame of the heating section, and the outer dimensions of the cutting frame storage frame of the packaging cutting section are smaller than the outside dimensions of the cutting frame storage frame of the packaging cutting section. A film holding frame, which has a frame shape with slightly larger internal dimensions and has a film adhesive surface on its lower surface, is placed on the common base and connected to the heating work section and packaging cutting work section through a guide frame having a guide slot. Since it is provided so that it can be reciprocated between the two working parts and can be rotated up and down in both working parts, the film heating position and the packaging position can be separated from each other, and the thermal influence of the heating means does not affect the packaged items.

Moreover, the packaging position and the cutting position can be placed at the same position, which saves space and speeds up the work.

Furthermore, the film heated at the heating position can be brought to the packaging cutting position by the film holding frame in a well-stretched state.

That is, the upper surface of the receiving frame of the heating work part is a non-adhesive surface,
In addition, since the bottom surface of the film holding frame is an adhesive surface,
It has the above-mentioned effects.

In particular, the only movable part is the film holding frame, and since this is a simple operation of reciprocating sliding and up-and-down rotation, it can be done by hand, and the device can be extremely simple and inexpensive.
In addition, by placing the heating plate on the bottom side of the film, the film can be brought into full contact with the heating surface by its own weight, which prevents the film from softening and sagging during heating. There are no obstacles or shields in the position that would restrict the loading and unloading of trayed items, making it easier to work and improving operability and workability.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the device of the present invention, and FIG. 2 is an explanatory diagram showing the packaging procedure using the device of the present invention. 1...Base, 2...Film roll, 4.
...Film, 5...Heating plate, 7...
... Receiving frame, 10... Film holding frame, 10'
...Lower end surface, 13...Frame for storing cutting frame, 14...Cutting frame, 16...Tray, 17...Resistance Line, 19...Intake hole.

Claims (1)

[Scope of utility model registration request] On a common base, there is a heating work section of film equipped with a heating plate and a receiving frame surrounding the heating plate with the upper surface as a non-adhesive surface, and a cutting section on which a tray can be placed and a resistance wire is stretched around the outer periphery. A package that includes a frame, a cutting frame storage frame that stores the cutting frame, and a substrate that is attached to the frame, has an intake chamber at the bottom, has the cutting frame placed on the upper surface, and has an intake hole. and a cutting work section, and having a frame shape that is the same shape as the receiving frame of the heating work section and has an internal dimension slightly larger than the outside dimension of the cutting frame storage frame of the packaging cutting work section, A film holding frame whose lower surface is a film adhesive surface is placed on the common base and can be reciprocated between the heating work unit and the packaging cutting work unit via a guide frame having a guide slot, and
A packaging device for a tray serving surface, characterized in that both working parts are movable up and down.