JPS5571523A - Method of removing fin produced at primary product in double molding - Google Patents

Method of removing fin produced at primary product in double molding

Info

Publication number
JPS5571523A
JPS5571523A JP14485878A JP14485878A JPS5571523A JP S5571523 A JPS5571523 A JP S5571523A JP 14485878 A JP14485878 A JP 14485878A JP 14485878 A JP14485878 A JP 14485878A JP S5571523 A JPS5571523 A JP S5571523A
Authority
JP
Japan
Prior art keywords
primary
resin
core pin
molded product
hole
Prior art date
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.)
Granted
Application number
JP14485878A
Other languages
Japanese (ja)
Other versions
JPS6259645B2 (en
Inventor
Kenji Kishibe
Yoshihiro Oniike
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.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works Ltd
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 Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP14485878A priority Critical patent/JPS5571523A/en
Publication of JPS5571523A publication Critical patent/JPS5571523A/en
Publication of JPS6259645B2 publication Critical patent/JPS6259645B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Injection Moulding Of Plastics Or The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

PURPOSE: To improve productivity and to prevent the seperation of a primary and secondary molded products, by removing a resin fin produced at a hole of the primary molded product through the injection force of a secondary molding resin so that the primary and secondary molded products can be joined monolithically, when a double injection molding takes place.
CONSTITUTION: A No.1 cavity 7 consists of a stationary mold 5 and a No.1 moving mold 6 provided with a projecting No.2 core pin 9. A No.1 core pin 8, whose diameter is smaller than that of a sleeve 10 in the stationary mold 5, is situated abutting on to the No.2 core pin 9. A primary molded product 3 having a hole 2 is molded as a result of a thermoplastic resin being injected as a primary molding resin. The No.1 moving mold 6 is then removed, a secondary molding resin being injected into a space provided between the stationary mold and a No.2 moving mold 11 in such a condition as moves a bit backward the No.1 core pin 8. The resin is poured into all the way through to the back of the primary molded product 3 as a fin 1a produced at the hole 2 of the primary molded product is broken by an injection pressure. Thus, a collar is formed to thereby join monolithically the primary and secondary molded products.
COPYRIGHT: (C)1980,JPO&Japio
JP14485878A 1978-11-22 1978-11-22 Method of removing fin produced at primary product in double molding Granted JPS5571523A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14485878A JPS5571523A (en) 1978-11-22 1978-11-22 Method of removing fin produced at primary product in double molding

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14485878A JPS5571523A (en) 1978-11-22 1978-11-22 Method of removing fin produced at primary product in double molding

Publications (2)

Publication Number Publication Date
JPS5571523A true JPS5571523A (en) 1980-05-29
JPS6259645B2 JPS6259645B2 (en) 1987-12-11

Family

ID=15372033

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14485878A Granted JPS5571523A (en) 1978-11-22 1978-11-22 Method of removing fin produced at primary product in double molding

Country Status (1)

Country Link
JP (1) JPS5571523A (en)

Also Published As

Publication number Publication date
JPS6259645B2 (en) 1987-12-11

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