JP2010280446A - Heat sealing device and heat sealing method using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat sealing device capable of safely performing heat sealing of contents which is apt to invite ignition and explosion without having risks of ignition. <P>SOLUTION: To solve the problem, the heat sealing device 3 has a pair of rod-shaped contact members 9 for coming in contact with a plastic film, and a flow passage 10 where hot water for heating the contact member 9 flows and heat carries out sealing by heating the plastic film with hot water supplied from a heat source located at a far place. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a technique for heating and bonding a plastic sheet for packaging and packaging.

For example, as shown in Patent Document 1 and the like, a technique for filling a packaging material made of a plastic film with contents and heat-sealing is widely implemented. The granular material packaging and filling apparatus described in Patent Document 1 is an apparatus for filling and packaging a predetermined amount of granular material in an inner bag, and further packaging this with an outer bag.

JP-A-8-11801

As described in paragraph 0013 of the same document, the heat sealing mechanism of the powder package filling and filling device described in Patent Document 1 has a heater built in a pair of bars and is heated by energizing the heater by bringing them close to each other. -The plastic film is heat sealed by pressing.

There are various other packaging devices and packaging devices, but the heat-seal mechanism is almost the same as that described in Patent Document 1, and by energizing and heating the electric heating device built in the bar Heat sealing is performed. However, the contents to be filled in the plastic film may be flammable or explosive. In addition, the site where the packing operation is performed may be in an environment in which a device that is in danger of ignition cannot be used. Therefore, a heat seal device that can be used safely in such a case is desired.

An object of the present invention is to provide a heat seal device that can safely heat-seal contents that are not flammable and easily ignite or explode.

In order to solve the above-described problems, the heat sealing apparatus of the present invention has a contact member for contacting a plastic film and a heat medium flow path through which a heat medium for heating the contact member flows. It is good also as what has a pair of rod-shaped contact member for contacting a plastic film, and the flow path of the heat medium for heating the contact member is provided in the inside of at least one contact member. Furthermore, you may use warm water as a heat carrier.

In the heat sealing apparatus of the present invention, the plastic film is heated by a heat medium supplied from a heat source located at a remote location, so that an electric heater is not used near the contact member, and there is no risk of ignition. Have Therefore, it has the effect that it can be safely used as a packaging device for chemical substances and powders that are liable to ignite or explode.

It is a front view which shows a packing apparatus. It is a top view which shows a heat seal apparatus. FIG. It is explanatory drawing which shows operation | movement of a packing apparatus. It is sectional drawing which shows a part of container. It is a front view which shows operation | movement of a chuck | zipper. It is the same top view.

The best mode for carrying out the present invention will be described with reference to the drawings. FIG. 1 is a front view of a packaging device including a heat seal device. The packaging device of this example heat seals and seals the bag 2 placed inside the cylindrical container 1. The packing device includes a heat seal device 3, a bag raising member 4, a chuck 5, and a deaeration nozzle 6.

FIG. 2 is a plan view showing the heat sealing apparatus, and FIG. 3 is a sectional view thereof. The heat seal device 3 includes a first heat seal bar 7 and a second heat seal bar 8 in parallel. The first heat seal bar 7 has a contact member 9 made of a metal square pipe material such as stainless steel. The inside of the contact member 9 is hollow, and a heat medium flow path 10 is formed. A heat medium inlet 11 is provided at one end of the contact member 9, and a heat medium outlet 12 is provided at the other end, which is connected to a heat source (not shown) by a heat-resistant hose 13. It is supplied to the heat medium flow path 10 in the contact member 9. Various fluids can be used as the heat medium, but hot water is used in this example. Therefore, when the facility in which this packaging apparatus is installed is equipped with a boiler, hot water may be supplied from the boiler as a heat medium. The contact member 9 is provided with a temperature sensor 14 to detect the temperature of the contact member. The temperature sensor 14 is connected to a controller (not shown), adjusts the flow rate of the heat medium based on the temperature information, and controls the contact surface of the contact member 9 to a predetermined temperature.

The second heat seal bar 8 also has the same length as the first heat seal bar 7, and a flexible silicon resin 15 is provided on the surface facing the first heat seal bar 7.

Next, the bag raising member 4 will be described. The bag raising member 4 is provided as a pair on the left and right sides. The bag raising member 4 includes a main body portion 16 and a rod-shaped member 17. The main body has two concave portions 18 and three convex portions 19 provided at intervals. The rod-shaped member 17 can be translated so as to approach and separate from the main body portion 16. The bag raising member 4 can be moved left and right and up and down in FIG. 1 by the support member 20, and can rotate around the fulcrum 21.

Next, an example of a heat sealing method using this packing apparatus will be described. The bag 2 is put in the container 1 in advance, and the bag 2 is filled with contents to be packed. This operation may be performed automatically by providing a separate automated machine, or may be performed manually. The upper part of the bag 2 is folded along the outer wall of the container 1. The bag 2 used here is made of a plastic film that is welded by heat. For example, a bag formed by welding the lower part of a tubular plastic film can be used. In addition, a bag made of a material other than plastic, such as a paper bag, may be used. In this case, a plastic film that can be heat-welded is attached at least inside the closing position of the upper part.

The plastic film is preferably one that can be welded at a low temperature. In particular, in this example, since warm water is used as a heating medium, a plastic film that can be welded at 100 ° C. or lower, mainly composed of polyvinyl alcohol (PVA), is used.

FIG. 4 is a schematic diagram illustrating the operation of the packaging device. When the container 1 is set at a predetermined position, a series of operations is started. First, the bag raising member 4 is moved, and the rod-like member 17 is inserted between the outer wall of the container 1 and the folded portion of the bag 2 (FIG. 4a). FIG. 5 is a cross-sectional view showing a part of the container. Two ridges 22 are provided in a part of the container 1 along the height direction, and a groove 23 is formed between the two ridges 22. Further, the folded portion of the bag 2 is pulled by the suction nozzle 24 so as not to enter the groove 23. A similar structure is formed on the opposite side of the container cross section. Then, the rod-like member 17 of the bag raising member 4 enters the groove 23 from the lower end of the folded portion of the bag 2. Next, the bar-like member 17 is brought close to the main body portion 16 of the bag raising member 4 to hold the folded portion of the bag 2. The deaeration nozzle 6 is lowered and the tip portion enters the inside of the container 1.

While holding the folded portion of the bag 2 between the bar-like member 17 of the bag raising member 4 and the main body portion 16, the bag raising member 4 is raised and opened to the left and right. At this time, the bag raising member 4 is further rotated around the fulcrum 21 to be turned upside down. In this way, the upper end of the bag 2 is pulled left and right on the container 1 (FIG. 4b).

Next, the chuck 5 approaches the bag raising member 4 from the outside. FIG. 6 is a front view showing the operation of the chuck, and FIG. 7 is a plan view thereof. Two chucks 5 are provided on both the left and right sides with a predetermined interval therebetween. Then, each chuck 5 enters the position of the recess 18 of the bag raising member, and grips the upper end of the bag 2 (FIG. 4c).

When the upper end of the bag 2 is held by the chuck 5, the bag raising member 4 is retracted upward. By pulling left and right by the chuck 5, the upper end of the bag 2 is closed. The air inside the bag 2 is sucked out by the deaeration nozzle 6. When the deaeration is completed, the deaeration nozzle 6 is retracted upward.

Here, the heat sealing apparatus 3 operates. Although the heat seal device is not shown in FIGS. 4a to 4c, the first heat seal bar is waiting on the back side with respect to the upper end of the bag 2 in FIG. 4c, and the second heat seal bar is on the near side. Was waiting. The first heat seal bar 7 and the second heat seal bar 8 which are separated from each other approach each other and sandwich the upper portion of the bag 2 (FIG. 4d). The first heat seal bar 7 and the second heat seal bar 8 enter between the upper and lower chucks.

Heated hot water is supplied to the heat medium flow path 10 of the first heat seal bar 7, and the contact surface of the contact member 9 is heated to 85 ° C. or higher. When the contact member comes into contact, the plastic film constituting the bag 2 is welded and heat sealed.

When the heat seal is completed, the chuck 5, the first heat seal bar 7, and the second heat seal bar 8 each return to the standby position. At this time, air is blown onto the upper end of the bag 2 from above by an air nozzle (not shown) to push the upper end of the bag 2 into the container 1. This completes the work for one container. Thereafter, the container is replaced and the same operation is repeated.

In this embodiment, heat contact is performed by heating the contact surface of the contact member 9 with hot water, so there is no possibility of inducing ignition or explosion, and work can be performed safely. Many factories are equipped with boilers, and hot water can be supplied easily and inexpensively.

The application of the present invention is not limited to the above-described embodiment. Steam or oil may be used as the heat medium. In addition to the cylindrical shape, the container may be a box-like one, and may be a container filled with the contents without using the container. The scale of the implementation can be selected from large and small, and can be implemented on a large scale such as packaging of intermediate materials of rubber products, or can be used as a small device such as packaging of dispensed pharmaceutical products.

The present invention can be used as a safe heat seal device that is unlikely to induce ignition or explosion. It can be widely used as a heat seal device for packing and packaging various contents including heat seal for storage of powders and chemicals.

1. 1. Packing device Container 3. 3. Heat seal device 4. Bag raising member Chuck 7. First heat seal bar8. Second heat seal bar 9. Contact member 10. Heat medium flow path

Claims (2)

A heat source that heats water, having a pair of rod-shaped contact members for contacting the plastic film, at least one of the contact members is a metal pipe having a heat medium passage through which hot water for heating the contact members flows Is a heat seal device provided away from the contact member. A heat sealing method using the heat sealing apparatus according to claim 1, wherein a plastic film containing polyvinyl alcohol (PVA) as a main component is used, hot water is supplied to the hot medium flow path to the hot water, and the contact member 9. A heat sealing method in which a plastic film is welded by raising the temperature of the contact surface to 85 ° C. or more and bringing the contact member into contact with the contact surface.

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