JPS5699642A - Method of preventing sink mark on injection-molded parts - Google Patents

Method of preventing sink mark on injection-molded parts

Info

Publication number
JPS5699642A
JPS5699642A JP226180A JP226180A JPS5699642A JP S5699642 A JPS5699642 A JP S5699642A JP 226180 A JP226180 A JP 226180A JP 226180 A JP226180 A JP 226180A JP S5699642 A JPS5699642 A JP S5699642A
Authority
JP
Japan
Prior art keywords
rib
injection
expanded
interior
sides
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.)
Pending
Application number
JP226180A
Other languages
Japanese (ja)
Inventor
Yoshitaka Tsuchiya
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.)
Toyota Motor Corp
Original Assignee
Toyota Motor 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 Toyota Motor Corp filed Critical Toyota Motor Corp
Priority to JP226180A priority Critical patent/JPS5699642A/en
Publication of JPS5699642A publication Critical patent/JPS5699642A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • B29C2045/0043—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks preventing shrinkage by reducing the wall thickness of the moulded article

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

PURPOSE:To readily mold a resin product having excellent external appearance by forming hollows on both sides of the base part of a rib or the like so that the cooling speed at the base part is made equal to that of the other part in order to prevent generation of sink marks on the surface resulting from the discrepancy between the cooling times of the surface and the interior. CONSTITUTION:A mold 4 is used in which circularly expanded parts 5 encroaching on the molding space S1 for an injection-molded product 1 are formed at the positions corresponding to the positions on both sides of the connecting part of a rib 3 and a slab part 2 on the projecting side of the rib 3. Each expanded part 5 has a large contact area with fused resin, and liberated heat of the interior 2a of the connecting part is radiated through the expanded part 5. Accordingly, the radiation lag due to increase of thickness can be prevented.
JP226180A 1980-01-12 1980-01-12 Method of preventing sink mark on injection-molded parts Pending JPS5699642A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP226180A JPS5699642A (en) 1980-01-12 1980-01-12 Method of preventing sink mark on injection-molded parts

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP226180A JPS5699642A (en) 1980-01-12 1980-01-12 Method of preventing sink mark on injection-molded parts

Publications (1)

Publication Number Publication Date
JPS5699642A true JPS5699642A (en) 1981-08-11

Family

ID=11524417

Family Applications (1)

Application Number Title Priority Date Filing Date
JP226180A Pending JPS5699642A (en) 1980-01-12 1980-01-12 Method of preventing sink mark on injection-molded parts

Country Status (1)

Country Link
JP (1) JPS5699642A (en)

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