PROCESS FOR PARTIAL SHRINKAGE COMPENSATION IN PLASTICS MOULDINGS

• Main Authors: PROTTE RAINER, KUENZEL ROLAND, BERGER ARMIN, KLIMMASCH THOMAS
• Format: Patent
• Language: English; Korean
• Published: 18.09.2012
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

PURPOSE: A method for correcting the local shrinkage of a plastic product is provided to enable to apply for an operation device which a user can see with a back-lighting even in a dark place. CONSTITUTION: A method for correcting the local shrinkage of a plastic product comprises next steps. One surface of a plastic film is rearward-injected with greater than one kind of a thermoplastic plastic while not rearward-injecting one or more partial portions of a plastic film. An obtained plastic is cooled. A portion where not being rearward-injected of the obtained plastic product can be heated again.