Method for the crystallisation of a film, method and device for shaping a film, and system for producing products from a thermoplastic film material

Patent metadata

Field	Value
Publication number	US-12070893-B2
Application number	US-201816627443-A
Country	US
Kind code	B2
Filing date	Jun 28, 2018
Priority date	Jun 30, 2017
Publication date	Aug 27, 2024
Grant date	Aug 27, 2024

Abstract

A method for the crystallization of a film made of a thermoplastic film material, in particular a CPET material, to form a product in which a crystallization process is initiated by shaping the thermoplastic film material within a molding tool. A main crystallization of the crystallization process is carried on outside of the molding tool.

First claim

The invention claimed is:

1. A method for crystallization of a thermoplastic film material to form a product, said method comprising:
initiating a crystallization process by shaping the thermoplastic film material into a first shape within a first primary shaping station having a forming tool as a first molding tool;
moving the first shape thermoplastic film material out of the first primary shaping station and out of the first molding tool and onto a crystallization section located between the first shaping station and a secondary shaping station where a majority of the crystallization process occurs outside of the first molding tool during a clocked movement in a machine direction, wherein the machine direction refers to a transport direction in which film, blanks or products are conveyed along a production line;
moving the first shape thermoplastic film material into the secondary shaping station having a further molding tool as secondary molding tool, the secondary molding tool being different than the first molding tool and if needed, further shaping and/or crystallization processing the first shape thermoplastic film material; and
carrying out the majority of the crystallization process along the crystallization section outside the first and second molding tools while the thermoplastic film material is transported between the first and second molding tools without any molding or shaping of the thermoplastic film material occurring during the transport.

2. The method according to claim 1 , wherein the crystallization process of the thermoplastic film material is exclusively started by means of the first molding tool located upstream of the crystallization section in the machine direction and/or is ended by means of the further molding tool arranged downstream of the crystallization section in the machine direction.

3. The method according to claim 1 , further comprising independently crystallizing the thermoplastic material of a working cycle of one of the first or further molding tools and giving exclusive or additional crystallization time to the thermoplastic material outside the first or further molding tool to crystallize.

4. The method according to claim 1 , further including, transferring the thermoplastic film material shaped at an incoming molding region to the further molding tool after the crystallization along the crystallization section to control a degree of crystallization of the thermoplastic film material by means of the further molding tool and/or to post-mold the shaped thermoplastic film material by means of the further molding tool.

5. The method according to claim 1 , further including, exclusively heating the thermoplastic film material in the first molding tool upstream of the crystallization section and/or cooling in the further molding tool downstream of the crystallization section.

Assignees

• Kiefel Gmbh

Inventors

• Wabnig Erwin
• Wieser Gerhard
• Schutzinger Stefan

Classifications

• B29K2995/004

  Semi-crystalline · CPC title

• B29C2793/009

  after shaping · CPC title

• B29C2791/001

  Shaping in several steps · CPC title

• B29C51/445

  from a support after moulding, e.g. by cutting · CPC title

• B29C51/261

  Handling means, e.g. transfer means, feeding means (B29C51/44 takes precedence) · CPC title