Method of manufacturing hollow glass objects, and apparatus for carrying out the method
AssigneeU.S. Philips Corporation
InventorHendrik Romberg
Life of this patent
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Abstract
A method and an apparatus for manufacturing hollow glass objects according to the press-and-blow process, in which a glass gob is shaped in a cooled preform mould into an elongate parison, the parison, while freely hanging at its neck portion, is then subjected to a thermal intermediate treatment and subsequently the parison is blown up in a finish mould to the desired hollow glass object and is simultaneously subjected to an upsetting operation, in such a manner that the blown-up hollow glass object at the part having larger transverse dimensions has a considerable wall thickness.
Claims10
A method of manufacturing hollow glass objects by the press-and-blow process, comprising the steps of shaping a glass gob into an elongate parison in a preform mold;
- removing the parison from the preform mold and then subjecting the parison, while the parison is freely hanging by its open neck portion, to a thermal intermediate treatment and to an intermediate blowing operation;
- and then blowing the parison in a finish mold to form the desired glass object;
- and including the step, after removal of the parison from the preform mold, of subjecting the parison to an upsetting operation at its bottom part so as to obtain an given wall thickness distribution in the ultimately formed object,
- characterized by comprising the steps of cooling the parison in the preform mold,
- heating and then cooling the parison during said thermal intermediate treatment, and
- performing said upsetting operation during the blowing step, such that a temperature distribution is obtained in the parison with the temperature increasing from the neck portion to the bottom part, and that in the blown hollow object a wall thickness distribution is obtained having a considerable wall thickness at the wall portion having the largest transverse dimension.
An apparatus for manufacturing a hollow glass object by the press-and-blow process, so as to provide an object having a considerable wall thickness at a wall portion having the largest transverse dimension,
- comprising a neck mold composed of two symmetrical radially displaceable neck mold halves;
- a preform mold cooperating with a molding die;
- a finish mold consisting of two symmetrical finish mold halves and a disc-shaped bottom part;
- and cooling ducts provided in said preform mold, molding die and finish mold,
- characterized in that said preform mold comprises a mold holder, an insert with a molding cavity and a mold bottom,
- and axially extending cooling fins provided about the outer circumference of the insert, said fins together with the inner wall of the mold holder enclosing cooling ducts, said cooling fins having, over at least part of their length, a height decreasing toward the mold bottom.
Dependencies are inferred from the claim text.