Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric CorpfiledCriticalMitsubishi Electric Corp
Priority to JP13847880ApriorityCriticalpatent/JPS5763212A/en
Publication of JPS5763212ApublicationCriticalpatent/JPS5763212A/en
Casting Or Compression Moulding Of Plastics Or The Like
(AREA)
Abstract
PURPOSE: To accomplish a resin sealing free of burr by bulging a seal member outside a groove for retaining an expansible and reducible seal member formed outside a cavity at die joint surface in the molding.
CONSTITUTION: A groove for housing a seal member is formed outside a cavity 5 at a die joint surface A or outside the cavity and an injected resin passage and a hollow seal material 9 is inserted thereinto. After the clamping of the die, a fluid is forced into the seal material 9 and expanded until the seal presses against the surface and the back of an IC frame 3 to seal it airtight.