JPS5822890Y2 - packaging equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an apparatus for wrapping a tray containing food with a stretch film.

More specifically, a tray containing food is pressed against a stretched stretch film and the two are bonded together, and not only can packaging with a high display effect be achieved with a small amount of film, but also hermetic packaging is possible.

Conventionally, the most common packaging method for food trays is so-called stretch packaging, in which a stretched stretch film is wrapped around the tray from the front surface to the back surface.

However, this packaging wraps the entire tray in stretch film, and in order to prevent wrinkles from appearing on the surface, a considerable amount of film is folded into the back of the tray, so it is difficult to wrap the tray, considering its size. This method requires a large amount of stretch film and is uneconomical.

Furthermore, since the packaging is simply sealed due to the self-adhesive properties of the film, moisture loss and leakage occur, resulting in unsanitary conditions and a significant decrease in product value.

These problems can be solved by covering only the surface of the tray with a stretch film and welding the film to the shoulder of the periphery of the tray, but it is difficult to join the stretch film to the shoulder of the periphery of the tray without wrinkles. Because there is
The current situation is that this is not being done at all.

The present invention was developed in view of the current situation, and aims to enable a stretch film to be bonded to the peripheral shoulder of a tray in a neatly stretched state without wrinkles.

That is, the present invention is a device that joins the film to the peripheral shoulder of the tray while the tray is pressed against the stretched stretch film that is held under tension. It is possible to join stretch films without wrinkles by using tension in different stages.

Here, the tray referred to in the present invention is a sheet of ethylene polymer, propylene polymer, ethylene-vinyl acetate copolymer, vinyl chloride polymer, styrene-butadiene copolymer, or a foam sheet formed by pressure forming or vacuum forming. made of molded trays and injection molded trays, or foams of ethylene polymers, propylene polymers, ethylene-vinyl acetate copolymers, vinyl chloride polymers, styrene-butadiene copolymers or the like. A tray made of a composite sheet of at least two or more types.

The stretch film includes vinyl chloride polymer, vinylidene chloride polymer, ethylene polymer, ethylene-vinyl acetate copolymer, and the like.

Further, in the present invention, heat sealing, high frequency sealing, and ultrasonic sealing are used to bond the tray peripheral shoulder and the stretch film.

Hereinafter, the present invention will be explained in more detail based on the drawings.

FIG. 1 shows an example of a packaging device according to the present invention.
A stretch film 2 is held in a horizontally tensioned state by the stretch film fixing jig 1.

Directly below this stretch film 2, a stand 4 on which a tray 3 is placed is located.

The table 4 has the same shape as the tray 3, and the tray 3
is stored and held so that its peripheral edge shoulder portion 3' protrudes slightly.

A shaft 6 connected to a drive device 5 such as a motor or a hydraulic cylinder for pushing up the table 4 is attached to the table 4.

The platform 4 is pushed up by a drive device 5 until the tray peripheral shoulder 3' is pressed against the stretch film 2.

Above the stretch film 2 is a heat sealing head 7.
is provided.

This heat-sealing head 7 is mounted at a corresponding position on the peripheral shoulder 3' of the tray 3 and is connected by a shaft 8 to a drive 9 for lowering the heat-sealing head 7. , the table 4 is pushed up and the tray peripheral shoulder 3
′ is pressed against the stretch film 2, it descends and passes through the stretch film 2 to the tray peripheral shoulder 3′.
It is something that comes into contact with.

The position where the heat-sealing head 7 comes into contact with the tray peripheral shoulder 3' via the stretch film 2 is such that the stretch film 2 is moved to its original horizontal position by pressing the tray peripheral shoulder 3' against the stretch film 2. Preferably, the position is elevated within a range of 60 mm or less from the tensioned position.

Particularly preferred is a range of 0.1 mm to 5 Qmm.

If this position is too low, wrinkles will occur on the entire surface of the stretch film 2, reducing the display effect.
Moreover, if it is too high, the stretch film 2 will be damaged during packaging molding.

With this configuration, in addition to the tension force that is acting on the stretch film from the beginning, a non-axial stretching force is applied by pressing the peripheral shoulder of the tray, and the stretch film is tensioned in two stages before being stretched onto the tray. Since it is joined to the peripheral shoulder, wrinkles do not occur.

Furthermore, since the tray surface is simply covered, the amount of stretch film used is small, and packaging can be done economically and with a high display effect.

In particular, if the stretch film is bonded to the peripheral shoulder of the tray using a heat bar type, impulse type heat seal, high frequency seal, ultrasonic seal, etc., airtight packaging can be achieved, reducing moisture loss and leakage of food. can be prevented.

In the example shown in Fig. 1, the heat sealing head, which is the bonding device, is designed to descend, but it is fixed in the position described above, and the peripheral shoulder of the tray is attached to it through a stretch film. The platform may be raised until it makes contact.

FIG. 2 shows another example of the packaging device according to the present invention, in which two sets of nip rolls 22 and 22' are installed before and after a heat sealing head 24 and a stand 25, which are positioned above and below to sandwich a stretch film 21. The stretch film 21 fed from the original fabric roll 23 is passed through this nip roll 22.22'
It causes tension between people.

Further, a cutter 27 is provided on the side of the heat sealing head 24 for cutting the stretch film 21 around the tray 26 after the stretch film 21 has been bonded to the tray peripheral shoulder 26'.

With this configuration, it is possible to perform packaging continuously.

That is, by pressing and joining the peripheral shoulder of the tray to the stretch film held under tension by nip rolls, and then cutting the stretch film by making holes along the peripheral shoulder of the tray, the stretch film can be cut into the original film one after another. It can be pulled out from the roll and fed between nip rolls, allowing continuous packaging.

In addition, with this kind of continuous packaging, the stretch film can be wrapped immediately from the original roll, and unlike conventional stretch packaging, there is no need to cut the stretch film to an appropriate size before packaging. Therefore,
Another advantage is that the process can be simplified.

FIG. 3 shows another example of holding the stretch film under tension, in which an endless bell (32, 32') is provided to clamp both sides of the stretch film 31 sent out from the raw roll 33 from above and below. It is.

By tensioning the stretch film in this way, the holding range can be widened, making it easier to tension the entire film uniformly.

Next, examples of packages packaged using the apparatus according to the present invention will be shown.

Experimental Example 1 Styrene polymer sheet with a wall thickness of 150 μm (Denki Kagaku Kogyo Co., Ltd.)
10μ thick ethylene-vinyl acetate copolymer/low-density polyethylene polymer = 20/80 film (Toyo Soda Co., Ltd.) product name “Dencastyrol HI-E-4J”
Product name Mersen M/Mitsui Polychemical Co., Ltd. Mirason 2
7) The 2-layer sheet is molded using a pressure molding machine and an aluminum casting mold (
80 x 130 x 25 mm) with a hot plate surface temperature of 14
0℃, air pressure 5.0 kg/cm2, heating time 1.0
A tray was formed using sec, and pickled rakkyo was placed in the stretched vinyl chloride polymer stretch film (Denki Kagaku Kogyo Co., Ltd. registered trademark "Anka Wrap Fresh") at a position 10 mm higher than the horizontal tension holding position at the shoulder of the periphery of the tray. and seal with a heat bar type 100℃ heat sealing machine,
I cut the periphery.

This packaging form requires about 1/4 of the self-adhesive method of conventional stretch films, does not leak juices, has a significantly longer shelf life, and has the same display effect as conventional products.

Experimental Example 2 The same method as Experimental Example 1 was conducted except that 100 g of water was used instead of pickled rakkyo.

The state of water loss is shown in the table.

As explained above, according to the present invention, not only can packaging with a high display effect be achieved with a small amount of stretch film, but also airtight packaging is possible, and water loss and juice leakage can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an example of the device according to the present invention, where a is a state before joining, b is a state during joining, and FIG. 2 is a cross-sectional view showing another example of the device according to the present invention. Figures 3 and 3 show other examples of holding the stretch film under tension, in which a is a side view and b is a plan view. 1: Stretch film fixing jig, 2: Stretch film, 3: Tray, 3': Tray peripheral shoulder, 4: Stand, 5
: Drive device, 6: Shaft, 7: Heat sealing head, 8: Shaft,
9: Drive device, 21: Stretch film, 22° 22
': Nip roll, 23: Original fabric roll, 24: Heat sealing head, 25: Stand, 26: Tray, 26': Tray peripheral shoulder, 27: Cutter, 31: Stretch film,
32°32': Endless belt, 33: Original fabric roll.

Claims (6)

[Scope of utility model registration request] (1) A device that holds the stretch film under tension in the horizontal direction, a stand on which a tray is placed directly below the stretched stretch film, and a stand that holds the tray on the stand until the peripheral shoulder of the tray is pressed against the stretch film. A packaging device comprising: a device for pushing up a tray; and a device for joining a stretch film with a peripheral edge shoulder of the tray pressed against the stretch film. (2) A joining device is located in a range of 0.1 to 59 mm above the stretch film, corresponding to the peripheral shoulder of the tray, and a table on which the tray is placed is connected to the peripheral shoulder of the tray on the table through the stretch film. The packaging device according to item 1 of the claim for utility model registration, characterized in that it is pushed up to a position where it comes into contact with the device. (3) Place the bonding device 0°1~ above the stretch film.
The packaging device according to claim 2, which is characterized by having a device for lowering the material down to a range of 5 Qmm. (4) The bonding device is located above the stretch film from O01 to
The packaging device according to claim 2 of the utility model registration, characterized in that the packaging device is fixed within a range of 59 mm. (5) The packaging device according to claim 1, wherein the stretch film tension maintaining device is two sets of nip rolls that sandwich the stretch film. (6) The packaging device according to claim 1, wherein the stretch film tension maintaining device is two sets of endless belts that hold both sides of the stretch film from above and below.