Process and device for controlling the molding of a container
First Claim
1. A process for controlling the molding of a container during the manufacture of containers from a thermoplastic material, in which at least two injection-molded preforms are temperature-treated and delivered in succession to at least one blow station for blow molding of the preforms into containers, characterized in that, in order to compensate for nonuniform heat content in the material of the preforms (1) relative to one another, at least one blow parameter during molding of the preforms (1) into containers (13) is specified in a fashion that differs among them in such a manner as to compensate for the nonuniform heat content such that containers (13) with approximately identical spatial distribution of wall material, orientation properties, and crystallization characteristics exist when the blow-molding process is finished.
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Accused Products
Abstract
The process and device are intended for controlling the molding of a container during the manufacture of containers from a thermoplastic material. At least two previously injection-molded preforms are temperature-treated and delivered in succession to at least one blow station for blow molding of the preforms into containers. In order to compensate for nonuniform temperature distribution in the material of the preforms relative to one another, at least one blow parameter during molding of the preforms into containers is specified in a fashion that differs from one to the next. The differing specification is made in such a manner as to compensate for the nonuniform temperature distribution so that containers with approximately identical spatial distribution of wall material, orientation properties, and crystallization characteristics exist when the blow-molding process is finished.
23 Citations
19 Claims
- 1. A process for controlling the molding of a container during the manufacture of containers from a thermoplastic material, in which at least two injection-molded preforms are temperature-treated and delivered in succession to at least one blow station for blow molding of the preforms into containers, characterized in that, in order to compensate for nonuniform heat content in the material of the preforms (1) relative to one another, at least one blow parameter during molding of the preforms (1) into containers (13) is specified in a fashion that differs among them in such a manner as to compensate for the nonuniform heat content such that containers (13) with approximately identical spatial distribution of wall material, orientation properties, and crystallization characteristics exist when the blow-molding process is finished.
- 13. A device for blow molding of containers from a thermoplastic material that has a temperature treatment unit for injection-molded preforms, at least one stretching unit for the preforms, and also has at least one blow station for molding the preforms into containers, characterized in that parameter control is provided which specifies at least one of the parameters influencing the molding process differently from one preform to the next for at least two preforms processed in succession.
Specification