JPS57199535A - Score molding method of easy-opening cover body - Google Patents

Score molding method of easy-opening cover body

Info

Publication number
JPS57199535A
JPS57199535A JP8246181A JP8246181A JPS57199535A JP S57199535 A JPS57199535 A JP S57199535A JP 8246181 A JP8246181 A JP 8246181A JP 8246181 A JP8246181 A JP 8246181A JP S57199535 A JPS57199535 A JP S57199535A
Authority
JP
Japan
Prior art keywords
edge
score
thickness
easy
auxiliary
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
JP8246181A
Other languages
Japanese (ja)
Other versions
JPH0122056B2 (en
Inventor
Kikuo Kawamuki
Toshiharu Kaneko
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.)
Toyo Seikan Group Holdings Ltd
Original Assignee
Toyo Seikan Kaisha 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 Toyo Seikan Kaisha Ltd filed Critical Toyo Seikan Kaisha Ltd
Priority to JP8246181A priority Critical patent/JPS57199535A/en
Publication of JPS57199535A publication Critical patent/JPS57199535A/en
Publication of JPH0122056B2 publication Critical patent/JPH0122056B2/ja
Granted legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
    • B21D51/383—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures scoring lines, tear strips or pulling tabs

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers Opened By Tearing Frangible Portions (AREA)
  • Closures For Containers (AREA)

Abstract

PURPOSE:To reduce defect generation rate in case of manufacture, by specifying the relation of edge thickness of a main score edge and that of an auxiliary score edge, and maintaining an easy-opening property of an easy-opening cover. CONSTITUTION:An edge 21 of an auxiliary score edge 20 is made lower than an edge W2 of a main score edge 18, by score depth h3 worked by the main score edge at first, and also edge thickness W4 of the auxiliary score edge 20 is made thicker than the edge thickness W2 of the main score edge 18 (W2<W4). It is desirable, however, that the thickness W4 of the edge of the auxiliary score edge 20 in that case is made thinner than thickness W5 of a place which has descended by h3 from the edge of the main score edge 18 (W4<W5). Accordingly, strength of the auxiliary score edge is increased, and loss and abrasion of the auxiliary score edge are prevented.
JP8246181A 1981-06-01 1981-06-01 Score molding method of easy-opening cover body Granted JPS57199535A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8246181A JPS57199535A (en) 1981-06-01 1981-06-01 Score molding method of easy-opening cover body

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8246181A JPS57199535A (en) 1981-06-01 1981-06-01 Score molding method of easy-opening cover body

Publications (2)

Publication Number Publication Date
JPS57199535A true JPS57199535A (en) 1982-12-07
JPH0122056B2 JPH0122056B2 (en) 1989-04-25

Family

ID=13775141

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8246181A Granted JPS57199535A (en) 1981-06-01 1981-06-01 Score molding method of easy-opening cover body

Country Status (1)

Country Link
JP (1) JPS57199535A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5988668A (en) * 1982-11-13 1984-05-22 Japan Radio Co Ltd Apparatus for measuring stem azimuth
US5938390A (en) * 1997-12-15 1999-08-17 Aluminum Company Of America Antifracture scores for easy open container walls
US6761281B2 (en) 2002-11-26 2004-07-13 Rexam Beverage Can Company Modified score for smooth openability
JP2005104499A (en) * 2003-09-29 2005-04-21 Toyo Seikan Kaisha Ltd Opening structure of container, method for manufacturing it and apparatus for manufacturing it
JP2006206133A (en) * 2005-01-31 2006-08-10 Yoshino Kogyosho Co Ltd Discharging cap

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5988668A (en) * 1982-11-13 1984-05-22 Japan Radio Co Ltd Apparatus for measuring stem azimuth
US5938390A (en) * 1997-12-15 1999-08-17 Aluminum Company Of America Antifracture scores for easy open container walls
US6761281B2 (en) 2002-11-26 2004-07-13 Rexam Beverage Can Company Modified score for smooth openability
JP2005104499A (en) * 2003-09-29 2005-04-21 Toyo Seikan Kaisha Ltd Opening structure of container, method for manufacturing it and apparatus for manufacturing it
JP2006206133A (en) * 2005-01-31 2006-08-10 Yoshino Kogyosho Co Ltd Discharging cap
JP4526966B2 (en) * 2005-01-31 2010-08-18 株式会社吉野工業所 Pouring cap

Also Published As

Publication number Publication date
JPH0122056B2 (en) 1989-04-25

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