JPS5836523Y2 - Container heating device - Google Patents

Description

[Detailed description of the invention] The present invention is a container heating device for a filling and packaging machine that is equipped with a container holder that repeatedly rotates and stops intermittently, and seals one end (bottom) of the container during the rotation and stopping process of the container holder. It is related to.

Hereinafter, a conventional container heating device for a filling and packaging machine will be explained based on FIGS. 1 to 6.

A magazine 1 holds a container material 2a.

The container material 2a is extracted from the magazine 1 by means not shown.
While being transferred onto the feeding device 3, the container holder 5 is formed into a cylindrical shape (generally with a square cross section) to become the container cylinder 2b, and is rotated and stopped intermittently around the rotating shaft 4 at fixed pitches by the feeding device 3. It will be packaged in

The stopping positions of the container holder 5 are indicated by A, B, C, D, E, and F. At the A position, the container cylinder 2b is sheathed from the top part onto the container holder 5, and at the B position, the preliminary bending is carried out by the cylinder. The container cylinder 2b is pre-folded along the creases (fleece) by the container 6, and the bottom part of the container cylinder 2b that has been pre-folded at position C is heated by the heating device 7 and is heated on the inner and outer surfaces of the container cylinder 2b. The pre-applied thermoplastic resin such as polyethylene is melted and the container cylinder 2 is placed at position D.
The bottom part b is pressed against the container holder 5 by a pressing device 8 with a pressure of several tons, and is cooled and the molten resin is bonded and solidified to form the shape of the container bottom.

Next, when the E position is reached and the F position is reached, the container holder 5
The suction head 10 of the drawer device 9, which moves up and down from between the conveyor 11 that moves intermittently in synchronization with the conveyor 11, rises and adsorbs the bottom of the container, and then descends to remove the bottom-formed container 2C from the container holder 5. It is pulled out and transferred onto the stationary transport conveyor 11.

Reference numeral 12 denotes a preliminary folding device which works together with a pushing and expanding device 13 on the top portion of the moving container 2C.

Reference numeral 14 indicates a filling section, 15 indicates a heating device, and 16 indicates a pressing section, thus completing the entire operation.

Here, the container material 2a described above may be one with a three-layer structure such as polyethylene/paperboard/polyethylene, or one with a three-layer structure such as polyethylene/paperboard/polyethylene/aluminum foil/polyethylene (with the paperboard side on the outside) for the purpose of long-term storage of the filling liquid. There are five-layer structures on the market, such as aluminum foil (on the aluminum foil side or inside).

The heating device 7 for these containers is constructed as follows.

In FIGS. 3 to 5, reference numeral 20 denotes a flexible pipe that guides hot air sent from a hot gas source (not shown), and a connecting pipe 21
has been contacted.

Reference numeral 22 denotes an oven, which is composed of an upper plate 22a, a tube 22b, and a lower plate 22C.

The oven 22 communicates with the connecting pipe 21 through holes 22d in the upper plate 22a, and through holes 22 in the lower plate 22C.
2 e to the center oven 23, hole 22 f,
22 g to the side oven 24.25.

26 is a side oven with hole 26a. 26b to side ovens 24 and 25, respectively.

27 is the lower play) 22 With the bolt fixed to C,
Side ovens 24, 25, and 26 are attached with nuts.

Center holder 23 has bolt 28 attached to lower plate 22C.
It is attached by.

29 is a cover which is attached to the lower plate (22C) by welding or the like.

The three sides of the side ovens 24, 25, 26 facing the center oven 23 and the three sides of the center oven 23 facing the side ovens 24, 25, 26 are arranged as shown in FIG. This corresponds to the heated portion of the bottom flap 30 of the container barrel shown by the dotted portion in FIG.

) A large number of small holes 31 are provided. Among the bottom flaps 30 of the container cylinder 2b, the side closing flaps 32 and 33
The rear closing flap 34 is connected to the side ovens 24, 25, 26 and the center oven 2 so as to be heated both inside and outside.
It is designed to be inserted into the U-shaped groove formed by 3.

In order to heat only the inside of the front closure flap 35, which is the lowest part of the bottom-sealed container 2C (see FIG. 2),
As shown in FIG. 3, the other side of the center oven 23 has elongated holes 37 only in the portion facing the closure flap 36, and small holes 31 in the other portions.

One end of the upper play 1-22a is connected to a drive source (not shown) by a rod 38, and the heating device 7 is reciprocated in the direction of an arrow 39, so as to heat the bottom flap 30 of the container tube 2b bursting into the container holder 5. It has become.

However, since the confinement flap 36 portion of the container tube 2b has three layers, the container is heated to a high temperature during the process of forming the container material 2a, and the shaded portion in FIG. 6 suffers from oxidative deterioration.

Therefore, when sealing the bottom, a larger amount of heat is required than other parts that have not undergone oxidative deterioration. flap 32.33
, 34.

When the heat source capacity is adjusted to the amount of heating heat required for the oxidation-deteriorated part near the closing flap 36, the part that has not undergone oxidation deterioration becomes overheated and the air and volatile substances contained in the paperboard that makes up the container are heated up. Thermal expansion causes peeling between the polyethylene/paperboard/polyethylene and the aluminum foil/polyethylene, and the aluminum foil swells, causing the aluminum foil to tear or even if it does not tear, wrinkles occur due to the pressing action of the next process, resulting in wrinkles. The aluminum foil may tear and cause liquid leakage.

Therefore, if the heat amount of the heat source is reduced, a sealing failure will occur in the vicinity of the containment flap 36, and the liquid leakage will not be resolved.

In addition, it is extremely difficult to adjust the heat amount of the heat source to respond delicately to changes in the thickness of the paperboard of the container and changes in the physical properties of polyethylene and aluminum foil.
It was necessary to prepare elongated holes according to each container.

The present invention was proposed in view of the above-mentioned points, and in a container heating device in a filling and packaging machine, hot air from a heating heat source is supplied to a hot air distribution oven, and a large number of required size In a container heating device for a filling and packaging machine that blows hot air from a hole in a container to a heat-sealed portion of the container, the oven includes a partition plate that divides the inside of the oven into a plurality of sections in the circumferential direction; A partition guide consisting of a plate having holes for adjusting and distributing the amount of hot air supplied to each section divided by the plate is provided, and the amount of hot air blown out from the many holes is adjusted based on the thermal history of the heat-sealed part of the container and It is characterized in that the air is blown out in accordance with the heat capacity, and its purpose is to provide a container heating device that can eliminate the drawbacks of the conventional devices described above.

Since the present invention is configured as described above, the amount of heat from the heating heat source is distributed by the partition guide, and the container can be heat-treated with the amount of heat that corresponds to the heat history and heat capacity of the heat-sealed part of the container. Therefore, it is possible to easily perform a reliable seal that prevents liquid leakage due to poor heating or poor sealing.

An embodiment of the present invention will be described below with reference to FIGS. 7 and 8.

Note that this embodiment shows only the center oven portion, which is different from the conventional heating device.

Reference numeral 50 denotes a partition guide, which has three round holes 50 a in the plate 51 so as to divide the hot air flowing in from the holes 22 e into four parts.
and the wall of the center oven 23.
0 b.

Each round hole 50a is provided with an adjustment plate 52 that is attached to the plate 51 with bolts 53, and 54, 55, and 56 are partition plates that are fixed to the plate 51 by welding or the like so that the flow rate of hot air can be adjusted. has been done.

In the above embodiment, when the container cylinder 2b moves to the heating process, the heating device 7
The container cylinder 2b starts to move forward toward direction b, and the bottom flap 30 of the container cylinder 2b is placed inside the U-shaped groove formed by the center oven 23 and the side ovens 24, 25, and 26.

At this time, a heat source is set in the square hole 50b of the center oven 23 corresponding to the portion of the confinement flap 36 so as to obtain enough heat to heat the three layers of confinement flaps 36, and the heat source is oxidized. The parts that have deteriorated are heated.

On the other hand, each round hole 50a is designed to prevent overheating by adjusting the amount of heat by moving the adjusting plate 52.

When the required heating is completed, the heating device 7 returns to the initial position, and the container cylinder 2b is moved to the pressing process.

Therefore, (1) Heating can be performed according to the heating history and heat capacity of the container, so liquid leakage due to tears in the aluminum foil of the container can be eliminated.

(2) Changes in the thickness of the paperboard of the container and changes in the physical properties of polyethylene and aluminum foil can be easily accommodated by combining the adjustment of the heat amount of the heat source and the adjustment of the adjustment plate 52, making it possible to perform appropriate heat treatment. Become.

Practical effects such as these can be obtained.

Although the above explanation was about a 5-layer carton containing aluminum foil, plastic laminated cartons that do not contain aluminum foil (for example, the 3-layer structure such as the polyethylene/paperboard/polyethylene mentioned above) also suffer from confinement that causes oxidative deterioration. The same effect as in the case of five layers can be observed in the heat distribution by the heating heat distribution device to the vicinity of the flap 36 and other areas where oxidative deterioration has not occurred.

[Brief explanation of drawings]

Fig. 1 is a schematic side view showing a conventional filling and packaging machine, Fig. 2 is a view showing the forming process of packaging container material, Fig. 3 is a partially cutaway front view showing a conventional heating device, and Fig. 4 is a schematic side view showing a conventional filling and packaging machine. A-A in Figure 3
5 is a sectional view taken along the line B-B in FIG. 4, and FIG.
The figure is an enlarged perspective view showing an example of a container cylinder, FIG. 7 is an enlarged front view of the main part showing an embodiment of the present invention, and FIG. 8 is a sectional view taken along the line C--C in FIG. 7. 23: Center oven, 50: Partition guide, 50a
: Round hole, 50b: Square hole, 51 nib L/-), 52: Adjustment plate, 54, 55.56: Partition plate.

Claims (1)

[Scope of utility model registration request] Container heating in a filling and packaging machine that supplies hot air from a heating heat source to a hot air distribution oven, and blows the hot air to the heat-sealed portion of the container through a number of holes of a required size provided on the outer circumferential surface of the oven. In the apparatus, the oven includes a partition plate that circumferentially divides the inside of the oven into a plurality of compartments, and a plate having holes for adjusting and distributing the amount of hot air supplied to each compartment divided by the partition plate. A container heating device characterized in that a partition guide is provided, and the amount of hot air blown out from the plurality of holes is made to correspond to the thermal history and heat capacity of the heat-sealed portion of the container.