PRODUCTION OF RUBBER MOLDED ITEM

PURPOSE:To produce a rubber molded item without occurrence of voids in a product while preventing the deformation and breakage of a fitment to be inserted. CONSTITUTION:A fitment 40 to be inserted is set in a cavity 14 of a mold 16. A rubber 42 is injected from a rubber injection port 20. Thereafter...

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Bibliographic Details
Main Author KURITA KOZO
Format Patent
LanguageEnglish
Published 25.01.1994
Edition5
Subjects
AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
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
TRANSPORTING
WORKING OF PLASTICS
WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Summary:PURPOSE:To produce a rubber molded item without occurrence of voids in a product while preventing the deformation and breakage of a fitment to be inserted. CONSTITUTION:A fitment 40 to be inserted is set in a cavity 14 of a mold 16. A rubber 42 is injected from a rubber injection port 20. Thereafter, the mold 16 is clamped by pressurizing clamping hot platens 18A, 18B. The rubber is vulcanized by heating the mold for a predetermined time at a predetermined temperature through the hot platens 18A, 18B. When the detection pressure of a pressure sensor 24 detecting a pressure in the cavity exceeds a reference value a fluid cylinder 30 retracts a slide pin 28 through a pressure measuring device 32 and a pressure regulator 34 for keeping the pressure in the cavity 14 constant. Therefore, there is no possibility that the fitment 40 deforms or breaks and a rubber molded item can be produced without occurrence of voids.
Bibliography:Application Number: JP19920195929