JPH0333602Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention is mainly used for mushrooms such as fresh shiitake mushrooms, vegetables, etc.
Accommodates, transports, stores, and stores fresh foods such as fruits.
The present invention relates to a device used to spread a film-like cover over the opening of a container for sale or the like after the contents have been contained therein.

(b) Prior art Containers used for the above purposes are usually vacuum-formed or pressure-formed thin plates made of hard polyvinyl chloride, polystyrene, etc., and their covers are made of wrapped soft polyvinyl chloride, polychlorinated polyvinyl chloride, etc. Vinylidene, polyethylene, etc. are used, but conventionally, in order to cover the opening of a container with these films, the main methods have been to glue them with an adhesive or to heat-melt and heat-seal them. I was worried.

However, adhesion poses a risk of dust adhesion during work, which is not only unclean, but also causes hygiene problems due to the use of solvents. Furthermore, according to the heat sealing method, not only complicated equipment for heating and pressurizing, etc. and heat consumption required for melting become large, but also, as mentioned above, raw shiitake mushrooms stored in this container,
In order to maintain the freshness of raw vegetables, it is necessary to allow them to come into contact with oxygen, carbon oxide gas, etc. through slight air circulation, rather than storing them in a completely sealed container. There was a need for a cover that could be easily opened and closed while completely preventing this.

(c) Problems that the invention aims to solve This invention solves the above-mentioned drawbacks of conventional container covers, spreads a wrap-like film uniformly over the opening of the container, and prevents dust, insects, etc. The purpose of this work is to provide a cover spreading device that prevents intrusion and that allows the cover to be opened or removed easily during storage or consumption of the contents without tearing the cover open. I have completed this.

(d) Means for Solving the Problems The structure of this invention, which was devised to solve the above-mentioned drawbacks of the conventional method, will be explained based on drawings showing examples of its implementation.

1 is a film heater for heating the membrane-like film that serves as the cover and spreading it on the opening of the container, and is equipped with a heating device such as electric heating using nichrome wire or the like, and heating is performed on the entire surface of the plate. Although the heating temperature varies depending on the material of the film used, the film softens and is spread over the opening 511 of the container 5, and when cooled, it shrinks and becomes a cover while retaining tension. is necessary.

Reference numeral 2 denotes the main body of the apparatus, in which a container 5 made of a hard thin plate made of polyvinyl chloride resin, polystyrene resin, etc., molded by vacuum forming or pressure forming is inserted into an opening 51.
The flange-shaped flat part of the container is held horizontally, and the bottom of the main body has an intake hole 4 for reducing pressure, which is connected to a vacuum device to reduce the pressure around the outer periphery of the container, especially around the opening.

Furthermore, the structure includes a fusing hot wire 3 for trimming excess film around the periphery of the opening of the container.

That is, the covering film 5 preheated by the film heater 1 remains attached to the preheating spreading plate 1 and is gripped by the main body 2 of the apparatus and is applied to the brim-like flat part of the opening 51 of the container 6 containing the contents. It will be deployed.

Next, the excess portion of the outer periphery of the film is cut by the hot wire 3 heated by electricity, and at this time, the outer periphery of the film is cooled and shrinks, and is wrapped around the opening 51 of the container to complete the lid.

Further, by returning the film heater 1 to its original state, the preheated and softened film is stuck to the opening of the container by the tension caused by the shrinkage of the film itself as it cools and by the suction force caused by the external reduced pressure.

In addition, the above-mentioned device can be operated manually or powered for moving the film heater and loading the film and containers, and is equipped with a temperature control device in the film heater, a pressure reduction control device in the main body of the device, and a heating wire for fusing. It is effective to automate each process by providing an energization adjustment device. Note that the heat source for preheating is not limited to electric heat.

(e) Action The preheated and softened thermoplastic film is stuck to the opening of the container by reducing the pressure around the container's periphery and shrinking during cooling, and then the fused peripheral edge is attached to the flange-shaped part of the opening of the container. The film-like cover was completed by wrapping it around the

(f) Effects of the invention This invention has completed a device that makes it possible to apply a film cover to a molded product container without using conventional methods of adhesive bonding or heat welding, which have various drawbacks as described above. dust,
This new product not only prevents the entry of small insects, but also makes it easy to open the lid when using the contents, and also allows for air supply, which is essential when storing mushrooms, fresh vegetables, etc. It is an idea.

[Brief explanation of the drawing]

FIG. 1a is a perspective view of a film preheating and spreading plate of an embodiment of the container membrane lid spreading device according to the present invention. FIG. 1b is a perspective view of the same device main body. FIG. 2 is a perspective view of the container with a lid. In the figure, 1... Film heater, 11... Terminal for heater, 2... Device main body, 3... Hot wire for fusing, 31... Terminal for hot wire, 4... Inlet for decompression,
5... Covering film, 51... Container opening, 5
2... Similarly, the brim-shaped part, 6... Molded container, 7... Contents.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A film heater 1 that heats and spreads a membranous lidding film, and a vacuum-formed or pressure-formed container that is held and housed horizontally, and that maintains a reduced pressure state around the outer periphery of the container. A membranous lid spreading device comprising a device main body 2 and a fusing hot wire 3 for trimming the outer periphery of the membranous lid to the upper part of the device main body, that is, to the periphery of the container opening. (2) The film lid spreading device according to claim 1, wherein the film heater 1 is provided with a temperature control device, the main body 2 of the device is provided with a pressure reduction control device, and the fusing hot wire 3 is provided with an energization control device.