Bag packaging method

Abstract

A bag packaging method by which a mouth portion of a thin plastic-made bag filled with articles can be sealed without creases is provided. While a bag 4 filled with articles is conveyed by a blade conveyor 6, at position opposed to a sirocco fan 13, air is blown from the sirocco fan 13 toward a mouth of the bag so that the mouth portion of the bag 4 is opened. Two mouth spreader bars 20 are moved to position in front of the bag 4 so opened. The mouth spreader bars 20 having an interval between them narrowed are inserted into the bag 4. Then, the mouth spreader bars 20 have the interval widened and are retracted. Thereby, the mouth portion is spread flat. Narrowing and widening of the mouth spreader bars 20 are done by cam followers 24 engaging with different cams while moving forward and backward. The mouth portion of the bag 4 spread flat is pinched and sealed by a sealer without generation of creases and folded and bound by a binder 60.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a bag packaging method for producing a bag package of articles by sealing a mouth portion of a thin soft plastic bag filled with articles. [0003] 2. Description of the Prior Art [0004] A bag packaging method for producing a bag package by filling articles in a plastic-made bag and then sealing a mouth portion of the bag is widely practiced. However, while such a bag packaging method is carried out for packaging using a thick and comparatively strong plastic bag, under the present circumstances, such method is not practically used for packaging using a thin soft plastic bag. [0005] The reason therefor is that once the thin soft plastic bag is filled with articles, even if the mouth portion thereof is wanted to be sealed, the bag is very soft and weak so that it is extremely difficult to seal the mouth portion without generation of creases. [0006] For example, in a marketed package usi...

AI Technical Summary

Benefits of technology

[0017] Also, in the bag packaging method according to the present invention, it is preferable that an air suction pipe is inserted together with the mouth spreader bars into the bag having the mouth opened so that air in the bag having the mouth portion spre...

Problems solved by technology

However, while such a bag packaging method is carried out for packaging using a thick and comparatively strong plastic bag, under the present circumstances, such method is not practically used for packaging using a thin soft plastic bag.

The reason therefor is that once the thin soft plastic bag is filled with articles, even if the mouth portion thereof is wanted to be sealed, the bag is very soft and weak so that it is extremely difficult to seal the mouth portion without generation of creases.

Thus, as the mouth portion of the bag package using the thin plastic bag is not tightly closed by sealing, there is a problem that sweet smells come out of the bread or the like in the bag so that small insects are induced to enter the bag or dusts may come into the bag in the course of distributi...

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