Manufacture of plastic containers

Details Manufacture of plastic containers Manufacture of plastic containers

B - Operations, Transporting

29

C

18/716

B29C 45/56 (2006.01)

Patent

CA 1099065

ABSTRACT OF THE DISCLOSURE The present invention relates to an improve- ment in a method for the thermoforming of containers from thermoplastic materials in which method the rim of the container is formed as an integral part of the pre-form from which the container is thermoformed. The pre-form is obtained by introducing thermoplastic material into a closed space and then mechanically com- pressing the material. The improvement of the present invention relates to improved uniformity of flow of the thermoplastic material into the closed space, the use of a closed space defined by surfaces having a surface roughness in the range 50-125 µm rms and to a modified sequence of steps for forming the pre-form in which the compression of the thermoplastic material is commenced prior to the completion of the introduction of the material into the closed space. me process may be used in the manufacture of containers e.g. for the packaging of margarine, from polyethylene or polypropylene.

304002

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