Multistage process for producing hollow plastic articles from half shells
First Claim
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1. A process for producing hollow plastic articles comprising the steps:
- a) producing a tubular plastic parison by means of extrusion or coextrusion;
b) cutting open the tubular plastic parison with a cutting device to produce two planar-surface parts using pneumatically driven rollers arranged in the immediate vicinity of the cutting device for distancing the two planar-surface parts from the cutting device immediately after separation of the parison;
c) molding the planar-surface parts in two mold halves to give half shells, where a removable intermediate frame separates the mold halves from one another at least along peripheral edges, wherein the planar-surface parts and half shells are not in contact with one another;
d) opening the mold halves and removing the intermediate frame;
e) closing the mold halves, wherein the half shells come into contact with one another along a peripheral rim; and
f) bonding the half shellswherein the driven rollers are integrated within the cutting device.
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Abstract
The present invention relates to a multistage process for producing hollow plastic articles, encompassing the following steps:
- a) producing a tubular plastic parison by means of extrusion or coextrusion;
- b) cutting open the plastic parison to produce two planar-surface parts;
- c) molding the planar-surface parts in two mold halves to give half shells, where a removable intermediate frame separates the mold halves from one another at least along the peripheral edges, so that the semifinished products/half shells are not in contact with one another;
- d) opening the mold halves and removing the intermediate frame;
- e) closing the mold halves, with the result that the half shells come into contact with one another along a peripheral rim; and
- f) bonding the half shells to give a hollow article.
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Citations
22 Claims
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1. A process for producing hollow plastic articles comprising the steps:
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a) producing a tubular plastic parison by means of extrusion or coextrusion; b) cutting open the tubular plastic parison with a cutting device to produce two planar-surface parts using pneumatically driven rollers arranged in the immediate vicinity of the cutting device for distancing the two planar-surface parts from the cutting device immediately after separation of the parison; c) molding the planar-surface parts in two mold halves to give half shells, where a removable intermediate frame separates the mold halves from one another at least along peripheral edges, wherein the planar-surface parts and half shells are not in contact with one another; d) opening the mold halves and removing the intermediate frame; e) closing the mold halves, wherein the half shells come into contact with one another along a peripheral rim; and f) bonding the half shells wherein the driven rollers are integrated within the cutting device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A process for producing hollow plastic articles, comprising the following steps:
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a). producing a tubular plastic parison by means of extrusion or coextrusion; b). cutting open the tubular plastic parison with a cutting device to produce two planar-surface parts using pneumatically driven rollers arranged in the immediate vicinity of the cutting device for distancing the two planar-surface parts from the cutting device immediately after separation of the parison; c). controlling the distance between the two planar-surface parts with guide rollers; d). molding the planar-surface parts in two mold halves to give half shells, where a removable intermediate frame separates the mold halves from one another at least along peripheral edges, wherein the planar-surface parts and half shells are not in contact with one another; e). opening the mold halves and removing the intermediate frame; f). closing the mold halves, wherein the half shells come into contact with one another along a peripheral rim; and g). bonding the half shells wherein the driven rollers are integrated within the cutting device.
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Specification