Manufacturing container or tube from paper; or other manufacturi – Container making – Rigid container
Patent
1995-04-28
1997-04-08
Hail, III, Joseph J.
Manufacturing container or tube from paper; or other manufacturi
Container making
Rigid container
493184, 53477, 533709, B31B 164
Patent
active
056182538
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a heat sealing method for a paper container and an apparatus for heating seal portions of open edge portions such as a top edge portion and a bottom edge portion to bond the open edge portions and assemble a paper container. The present invention is applicable to all technical fields in which containers are filled with substances, particularly containers filled with liquid such as soft drinks or alcoholic drinks.
RELATED ART
Generally, closed paper containers which are filled with liquids such as soft drinks and alcoholic drink have been widely used.
The paper container is formed in the following manner. A plane paper material is folded in a cylinder shape to form the paper container. A bottom edge portion of the container is heated by a heating apparatus. Next, the bottom edge portion is folded along fold lines, and then the heated portion is press-bonded so as to form a bottom portion.
Thereafter, the paper container is filled with a predetermined liquid. A top edge portion which has fold lines is heated by the heating apparatus, and then the folded portion of the top edge portion is press-bonded. Thus, the contents of the paper container is sealed within the container.
The conventional heating apparatus which heats the edge portions of the paper container comprises a plane side heating portion, a folded side heating portion, and a hexagonal inner peripheral heating portion. The plane side heating portion heats two flat sides of the top edge portion of the container. The folded side heating portion heats two folded sides with fold lines of the top edge portion. The hexagonal inner peripheral heating portion heats entire inner walls of the top edge portion.
Many hot air blowing small holes are formed at predetermined portions of the flat side heating portion, the folded side heating portion, and the inner peripheral heating portion. Thus, hot air is blown from the many hot air blowing small holes to predetermined portions of the front and rear surfaces of the top edge portion.
Thus, according to the conventional heating apparatus, since hot air is blown from each hot air blowing small hole, the top edge portion of the paper container is locally heated. When the paper container is composed of a laminate of resin, aluminum foil, paper, resin, and so forth, heat is easily disfused since the aluminum has high heat conductivity. However, when the temperature of hot air is high, foams, burns, or pin holes result on the heated portion of the container.
When the paper container is composed of a laminate of resin, glass evaporation layer, paper, resin, and so forth, the portion exposed to hot air is locally heated since the glass evaporation layer has low heat conductivity. At this portion, therefore, foams, burns and pin holes tend result.
In addition, positions of the four inner corners of the top edge portion of the container vary for each paper container due to the difference of size and fold lines. Thus, the amount of hot air blown to the four inner corners varies for each paper container. Accordingly when the material is folded and pressed, seal defects will occur and the contents will leak out of the paper container.
Likewise, such problems occur in an apparatus which has many hot air blowing small holes blowing hot air toward the bottom edge portion of the paper container.
DISCLOSURE OF THE INVENTION
The present invention overcomes the above-described problems. An object of the present invention is to provide a seal-heating method for a paper container and apparatus for the same, for press-bonding the top edge portion or the bottom edge portion with hot air blown from hot air blowing small holes without occurrences of foams, burns, and pin holes and for equally and properly heating portions in the vicinity of four inner corners of the edge portions.
A first aspect of the present invention is a seal-heating method for a paper container using a seal-heating apparatus, comprising the steps of facing an inner seal portion of a seal portion formed at an op
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Dai Nippon Printing Co. Ltd.
Day Christopher W.
Hail III Joseph J.
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