JPS56127982A - Production of cassette case - Google Patents

Production of cassette case

Info

Publication number
JPS56127982A
JPS56127982A JP3072280A JP3072280A JPS56127982A JP S56127982 A JPS56127982 A JP S56127982A JP 3072280 A JP3072280 A JP 3072280A JP 3072280 A JP3072280 A JP 3072280A JP S56127982 A JPS56127982 A JP S56127982A
Authority
JP
Japan
Prior art keywords
case
resin
gate
edge
flow
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
JP3072280A
Other languages
Japanese (ja)
Other versions
JPS5942392B2 (en
Inventor
Masaoki Sekine
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.)
TDK Corp
Original Assignee
TDK 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 TDK Corp filed Critical TDK Corp
Priority to JP55030722A priority Critical patent/JPS5942392B2/en
Publication of JPS56127982A publication Critical patent/JPS56127982A/en
Publication of JPS5942392B2 publication Critical patent/JPS5942392B2/en
Expired 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
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds

Abstract

PURPOSE:To secure a smooth flow of the resin, by using a metal mold having a resin injecting gate where at least a part of the hole diameter covers the edge of a slide core at the area corresponding to the corner part of the upper surface plate of the cassette 1. CONSTITUTION:The resin injecting gate (f) is provided at the area corresponding to the corner part of the upper surface plate of a case. In this case, a part of the hole diameter of the gate (f) covers the edge 17a of the slide core 17. As a result, the resin supplied through the side part of the torpedo 18 that is kept warm hits the edge of the core 17, when injected to the product part 19 from the gate (f), and is branched as shown by the arrows (d) and (e) to the upper surface part 19a corresponding to the upper surface plate of the case and the back surface part 19b corresponding to the side plate or the back plate. In such way, the flow of the resin becomes very smooth. As a result, the flow marks or the weld marks that are caused by a small thickness of the case can be avoided.
JP55030722A 1980-03-10 1980-03-10 Cassette case manufacturing method Expired JPS5942392B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55030722A JPS5942392B2 (en) 1980-03-10 1980-03-10 Cassette case manufacturing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55030722A JPS5942392B2 (en) 1980-03-10 1980-03-10 Cassette case manufacturing method

Publications (2)

Publication Number Publication Date
JPS56127982A true JPS56127982A (en) 1981-10-07
JPS5942392B2 JPS5942392B2 (en) 1984-10-15

Family

ID=12311534

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55030722A Expired JPS5942392B2 (en) 1980-03-10 1980-03-10 Cassette case manufacturing method

Country Status (1)

Country Link
JP (1) JPS5942392B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62175469U (en) * 1986-04-24 1987-11-07

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62175469U (en) * 1986-04-24 1987-11-07
JPH0519894Y2 (en) * 1986-04-24 1993-05-25

Also Published As

Publication number Publication date
JPS5942392B2 (en) 1984-10-15

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