JPH03240615A - Method for replacing gas in rotary table packaging machine - Google Patents

Abstract

PURPOSE:To perform packaging operation efficiently using simple construction without providing a chamber for replacing gas by providing a seal means for packaging, comprising a temporary seal means and a main seal means and providing a gas seal means between said seal means. CONSTITUTION:A rotary table rotates intermittently and goods to be packed are placed in a container 2 having reached a specified position and thereafter a temporary seal means brings a covering film 11 close to the upper opening of the container 2 having reached the specified position, keeping the film in parallel with said opening, to thermally bond the film 11 to the opening, with at least two sections on the periphery of the opening being left unbonded, leaving, for example, four unbonded sections A, whereby the film 11 is cut off along the outer periphery of the container. And then, regarding a gas filling means, a suction means 18 sucks up the unbonded sections A of the film 11 utilizing vacuum to provide openings, whereby a gas flush nozzle 19 is inserted into said opening to feed inert gas. And a main seal means thermally bonds all the sections A of the film 11 of the container 2 which is intermittently rotated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a gas replacement method in a rotary table type packaging device.

(Prior art) In food containers, gas inert substitution is performed to prevent the contents from spoiling and enable long-term storage. In the process of moving the container 1° above the conveyor held, the gas pipe 5'
The process is carried out while blowing out nitrogen gas.

(Problem to be solved by the invention) By the way, filling and packaging of foodstuffs is sometimes carried out using a rotary table system, and in order to automatically perform the above-mentioned gas replacement during the rotation process, it is necessary to place the food on the rotary table. It is necessary to separately hold each food container in the chamber, which complicates the structure and increases costs.

An object of the present invention is to provide an efficient and inexpensive method that does not require a chamber for gas replacement and has a simple configuration.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a rotary table in which a container is placed on a rotary table and is moved intermittently around the rotary table, in which the contents to be packaged are filled and packaged. In the packaging system of the type packaging apparatus, the sealing means during packaging is divided into a temporary sealing means and a permanent sealing means, and a gas filling means is provided between these sealing means. Specifically, a lidding film is heat-welded to the upper opening of the container, leaving at least two non-welded areas, along the movement trajectory of a row of containers placed on a rotary table and moved around intermittently. a temporary sealing means for injecting an inert gas into the container from any non-welded parts after being processed by the means, and a gas filling means for blowing inert gas into the container from any non-welded parts, and sealing the container by thermally welding all of the non-welded parts. The sealing means for this purpose are arranged in this order and carried out.

(Example) Hereinafter, specific examples of the present invention will be described in detail based on the drawings.

FIG. 1 is a perspective view of a rotary table packaging apparatus according to the present invention, FIG. 2 is a perspective view of a temporarily sealed container, and FIG. 3 is an explanatory diagram of gas replacement processing.

In the figure, reference numeral 1 denotes a rotary table which is intermittently rotated around a center point O.

A series of through holes 3 are arranged around the table 1 into which containers 2 are inserted.

Reference numeral 4 denotes a container feeding means for feeding the containers 2 one by one into the through holes 3, which move sequentially as the rotary table l rotates.

Thereafter, the containers 2 supplied to the through hole 3 by the means 4 are arranged in a row and are moved around as the rotary table l rotates intermittently. The filling and packaging operations into the container 2 are performed in sequence, and in the illustrated example, 5 is a packing device, 6 is a temporary sealing means, 7 is a gas filling means, 8 is a main sealing means, and 9 is a packing device. The seal cooling device 10 is a container ejecting means.

Here, the packaging material filling device 5 is for filling the packaging material W into the container 2 that has reached a certain position, and the temporary sealing means 6 is for filling the packaging material W into the container 2 that has reached a certain position after being filled with the packaging material W. This is for temporarily sealing the upper opening of the container 2, and specifically, there is no such thing as described below.

That is, a supply drum 12 wrapped with the lidding film 11 and a collection drum 13 for winding up the used film.
and a guide roller 14 for bringing the lidding film 11 fed out from the supply drum 12 parallel to and close to the upper opening of the container 2 that has reached a certain position.
．． 15 and an auxiliary guide roller 16, and the container 2
A heating element 17 incorporating an electric heater is provided on the upper side of the lidding film 11 directly above the lidding film 11 so as to be movable up and down, and a lidding film L11 is cut along the outer periphery of the container 2 on the lower surface of the heating element 17. A cutting blade (not shown) is provided for this purpose, and as the heating element 17 descends a certain distance, the lidding film 11 is thermally welded leaving four non-welded areas around the upper opening of the container 2, as shown in FIG. Lid film 11
There are two types: one that operates to cut along the outer periphery of the container 2, and one that operates without cutting.

The gas filling means 7 is used to fill the air inside the temporarily sealed container 2 with an inert gas (nitrogen, etc.), and as shown in FIG. The container 2 consists of an adsorber 18 consisting of a nozzle and a gas flash nozzle 19 placed on the side, and the container 2 reaches a certain position.
The non-welded portion A of the lidding film 11 is sucked up by an adsorbent 18 to open it, and a gas flash nozzle 19 is inserted through the opening to blow out inert gas.

This sealing means 8 is a heating body 20 incorporating an electric heater directly above the container 2 which has been rotated intermittently after the above-mentioned gas replacement.
are arranged to be vertically movable, and all non-welded portions of the lidding film 11 are thermally welded and sealed.

The seal cooling device 9 is configured to cool the welded portion of the lidding film 11 by blowing air, and the container discharging means 10 scrapes out the container 2 pushed up by the push-up device 21 with a scraping device 22, and then scrapes out the container 2 with a scraping device 22. There are two types: those that are transferred to other locations and those that are not.

In the apparatus of the embodiment described above, the series of processes described above are performed automatically and continuously during the intermittent rotation of the rotary table.

In the present invention, gas replacement is performed by blowing inert gas into some of the plurality of non-welded areas (A) formed by temporary sealing of the container 2, so that the air inside the container 2 is replaced with an inert gas. This causes the gas to be pushed from behind and expelled from other non-welded areas (A), resulting in extremely high rate of gas replacement.

(Effects of the Invention) According to the present invention, there is no need to provide a chamber for gas replacement, and the configuration of the device is reduced to N! In addition, the operation is simple and can be carried out effectively and efficiently by blowing in a small amount of inert gas. .

[Brief explanation of drawings]

Fig. 1 is a perspective view of an uninvented rotary table packaging device, Fig. 2 is a perspective view of a temporarily sealed container, Fig. 3 is an explanatory diagram of gas replacement processing, and Fig. 4 is a conventional one. This shows the linear equation in DESCRIPTION OF SYMBOLS 1... Rotating table, 2... Container, 6... Temporary sealing means, 7 - Main sealing means, 1... Non-welding part.・Gas filling means, 8... Blue film, i...

Claims (1)

[Claims] (1) To thermally weld the lid film to the upper opening of the container, leaving at least two non-welded areas, along the movement trajectory of a row of containers placed on a rotary table and moved intermittently. a temporary sealing means, a gas filling means for blowing an inert gas into the container from any non-welded parts after being processed by the means, and heat welding of all the non-welded parts to seal the container. 1. A gas replacement method in a rotary table packaging device, characterized in that the present sealing means are arranged in this order.