Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1989-03-22
1991-02-19
Dawson, Robert A.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156192, 15624425, 383 63, B32B 3116
Patent
active
049941283
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a roll film onto which fastener claws, made of resin, are melt-attached in advance, which film, as a whole, is tensioned uniformly, and to a method for producing such a roll film. According to the present invention, a part of a conventional automatically packaging and filling machine is modified so that the automatic packaging and filling work may be performed at substantially the same filling speed as that of the conventional machine without needs of particular skills.
2. Background Art
There has been proposed a conventional method for producing a film having fastener claws, as shown in Japanese Patent Examined Publication No. 45-35191, in which male and female claw dies having discharge outlets for male and female claws are fixedly arranged in a transverse direction of a film moving along bonding rolls, and molten synthetic resin is extruded from the male and female claw dies so that the male and female claws are, respectively, melt-formed in parallel in the vicinity of the opposite width edges.
The fastener claw film produced according to the above-described method is folded over in the transverse direction engaging the male and female claws with each other. Under such a condition, parts corresponding to a bottom edge and side edges are melt-bonded and the film is cut, thereby individual fastener claw provided packages. After articles are filled into the fastenable packages, opening portions are melt-bonded and sealed.
Also, Japanese Patent Examined Publication No. 48-11981 discloses a method in which a film that is folded over in the transverse direction and has fastener claws is supplied and filled with articles; thereafter, only part of the fastener claws is engaged with each other; after melt-bonding in the lateral direction and cutting work, the fastener claws are fully engaged with each other with upper parts of the fastener claws melt-bonded.
However, because the above-described film is provided with male and female claws which increase the thickness therealong, the film is non-uniformly raised when rolled, so that it is impossible to ensure uniform tension. Also, even if the film would be forcibly rolled, because the width of the fastener provided portions is small, the roll of film would be likely to be deformed with the thickened portions being displaced or offset. In other words, it would be impossible to roll the film With a uniform tension so that the roll of film may be supplied to a high performance package producing machine or an automatic package producing and filling machine. Therefore, a roll in the form of a barrel is actually used, or a low performance package producing machine, based upon a supply of an unstable fastener claw provided film, loosely rolled at a large thickness, is used.
The roll that may be supplied to the automatic package producing and filling machine meets the requirement that any crease must be avoided because it is necessary to pay off the film at a constant tension and at a constant supply rate. In addition, the roll must meet the requirement that the tension be always kept constant in the longitudinal direction of the film, and that the roll film as a whole may smoothly be rotated with a good balance. It has been necessary to provide a roll film for fastener provided packages or bags, which may be supplied to the automatic package or bag producing and filling machine.
DISCLOSURE OF INVENTION
An object of the invention is to overcome the above-noted disadvantages. According to the structure of the invention, a roll film wound around a winding core is characterized in that fastener claws, made of resin, are continuously melt-formed along both edge portions of the film, respectively, and the film is wound in a serpentine manner relative to the winding core. The film is further characterized in that fastener claws, made of resin, are continuously melt-formed along both edge portions of the film, respectively, and thereafter, the film is wound in a serpentine manner relative to the winding core.
A
REFERENCES:
patent: 1884783 (1932-10-01), Marcalus
patent: 4582549 (1986-04-01), Ferrell
patent: 4694959 (1987-09-01), Ausnit et al.
patent: 4859259 (1989-08-01), Schneiber
Asahi Chemical Polyflex Ltd.
Dawson Robert A.
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