EP0592267A1 - Stahl für Verpackungszwecke und daraus hergestellte Behälter mit leicht-zu-öffnendem Deckel durch Aufreissen entlang einer Linie geringer Festigkeit - Google Patents

Stahl für Verpackungszwecke und daraus hergestellte Behälter mit leicht-zu-öffnendem Deckel durch Aufreissen entlang einer Linie geringer Festigkeit Download PDF

Info

Publication number
EP0592267A1
EP0592267A1 EP93402311A EP93402311A EP0592267A1 EP 0592267 A1 EP0592267 A1 EP 0592267A1 EP 93402311 A EP93402311 A EP 93402311A EP 93402311 A EP93402311 A EP 93402311A EP 0592267 A1 EP0592267 A1 EP 0592267A1
Authority
EP
European Patent Office
Prior art keywords
steel
sheet
content
packaging
ratio
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
EP93402311A
Other languages
English (en)
French (fr)
Other versions
EP0592267B1 (de
Inventor
Daniel Lafontaine
Jean-François Seconde
Patrick Zimmer
Michel Entringer
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.)
Sollac SA
Original Assignee
Sollac SA
Lorraine de Laminage Continu SA SOLLAC
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 Sollac SA, Lorraine de Laminage Continu SA SOLLAC filed Critical Sollac SA
Publication of EP0592267A1 publication Critical patent/EP0592267A1/de
Application granted granted Critical
Publication of EP0592267B1 publication Critical patent/EP0592267B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60

Definitions

  • the present invention relates to packaging of the type with opening by breaking a line of least resistance known as an easy-opening box.
  • Such packages are known which are for example intended to contain a drink, preserves or other products.
  • They include a cover in which is arranged a line of least resistance, for example an incision, delimiting an opening panel.
  • An actuating ring is fixed to the opening panel using a rivet.
  • the opening is caused by a tensile force on the actuating ring so as to break the metal at the level of the incision, the opening panel possibly being able to include a zone of connection with the cover so as not to come off. completely from the latter.
  • Such packaging can be made of aluminum but they are then relatively expensive.
  • the steel used for the production of such packaging must make it possible on the one hand to form the fastening rivet of the opening ring and, on the other hand, to break the line of least resistance easily without having to exert a too much effort.
  • the breaking load Rm must not be too high because otherwise the opening force to be exerted to break the line of least resistance must be significant.
  • the elastic limit ratio Re on breaking load Rm must be close to 1 so that the steel is sufficiently weakened to cause easy opening.
  • this Re / Rm ratio should not be too high, that is to say too close to 1, because in this case, the steel being very weakened, it becomes almost impossible to form the rivet, this operation requiring drawing. deep of the steel lid of the package.
  • the standard steel commonly used the elastic limit Re of which is equal to approximately 415 MPa and the breaking load Rm of the order of 430 MPa results in a Re / Rm ratio of the order of 0.96.
  • An easy-opening cover produced with such a steel has a high opening force, due to the value of Rm and a residual thickness at the level of the relatively large incision.
  • the level of elastic limit is important, which causes the formation of visible vermiculations during the stamping of the packaging, detrimental to the aesthetic appearance of the latter.
  • the object of the invention is to provide a packaging of the type with opening by breaking a line of least resistance, for which the overall effort required for opening is reduced, while having an improved appearance. after stamping the packaging, and good ability to form the rivet.
  • the subject of the invention is a metal packaging of the type with opening by rupture of a line of least resistance arranged in a wall portion of sheet steel, characterized in that the steel constituting the sheet has a carbon content of between 0.02 and 0.08% by weight and a boron content of between 0.002 and 0.004% by weight, the steel also containing nitrogen, the ratio of the boron content to the nitrogen content being greater than 0.8, the remainder being mainly iron and residual elements.
  • the subject of the invention is also a sheet of steel intended for producing a package and characterized in that the ratio of its elastic limit to its load at break is between 0.87 and 0.96, preferably between 0.91 and 0.92.
  • the subject of the invention is also a method of manufacturing a sheet suitable for producing the packaging according to the invention, in which the sheet is obtained by continuous rolling, and characterized in that after this continuous rolling, the sheet is subjected to a base annealing carried out for 8 to 10 hours at a temperature between approximately 550 and 650 ° C., the rise in temperature from ambient temperature being carried out in approximately 20 hours, then the sheet is subjected to a re-rolling cold with an elongation rate of between 5% and 10%.
  • Reducing the force required for opening requires the use of a steel having a relatively low yield strength, which moreover makes it easier to wind the opening panel after breaking the incision, and by a high Re / Rm ratio.
  • the appearance of the packaging as well as its resistance to corrosion are improved by the use of a sheet having a structure with fine equiaxed grains and not exhibiting an elastic limit bearing.
  • the packaging according to the invention is produced from a steel sheet whose carbon content is between 0.02 and 0.08% by weight and the boron content is between 0.002 and 0.004% by weight, the steel also containing nitrogen in an amount less than 0.005%, the ratio of the boron content to the nitrogen content being greater than 0.8.
  • a carbon content of less than 0.02% is difficult to achieve with the production processes conventional and may lead to insufficient mechanical strength of the cover.
  • the ratio of the boron content to the nitrogen content must be greater than 0.8, the boron being limited to 0.004 % because, for a higher content, there is an increase in the mechanical characteristics of the sheet and we see preferential oxidation appear at the edge of the product, which is unacceptable from an aesthetic point of view.
  • the process used to produce the sheet suitable for packaging according to the invention consists in that, after continuous rolling of the steel described above, the sheet is subjected to annealing on a basis carried out for 8 to 10 hours. at a temperature between approximately 550 and 650 ° C., the temperature rise from ambient temperature being carried out in approximately 20 hours. The sheet is then subjected to cold re-rolling with an elongation rate of between 5 and 10%.
  • the ratio of the elastic limit to the breaking load is between 0.91 and 0.92.
  • a package is thus obtained, the opening of which is fairly easy and having a good ability to form the rivet.
  • the thickness remaining at the bottom of the incision must not be less than 70 microns under penalty of unacceptable damage, while this thickness remaining at the bottom of the incision may decrease up to 50 microns in the case of the steel according to the invention.
  • This packaging produced from a sheet with an equiaxed structure with fine grains avoids, during the formation of the rivet, the appearance of roughness of deformation due to sagging, which is detrimental to the appearance of the packaging and to the holding a possible varnish.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Containers Opened By Tearing Frangible Portions (AREA)
  • Heat Treatment Of Steel (AREA)
  • Laminated Bodies (AREA)
  • Wrappers (AREA)
  • Cartons (AREA)
EP93402311A 1992-10-05 1993-09-21 Behälter mit leicht zu öffnendem Deckel durch Aufreissen entlang einer Linie geringer Festigkeit und Stahlblech zu seiner Herstellung Expired - Lifetime EP0592267B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9211788 1992-10-05
FR9211788A FR2696421B1 (fr) 1992-10-05 1992-10-05 Acier pour emballage à ouverture par rupture d'une ligne de moindre résistance.

Publications (2)

Publication Number Publication Date
EP0592267A1 true EP0592267A1 (de) 1994-04-13
EP0592267B1 EP0592267B1 (de) 1998-06-24

Family

ID=9434156

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93402311A Expired - Lifetime EP0592267B1 (de) 1992-10-05 1993-09-21 Behälter mit leicht zu öffnendem Deckel durch Aufreissen entlang einer Linie geringer Festigkeit und Stahlblech zu seiner Herstellung

Country Status (6)

Country Link
EP (1) EP0592267B1 (de)
JP (1) JP3304173B2 (de)
AT (1) ATE167704T1 (de)
DE (1) DE69319292T2 (de)
ES (1) ES2118918T3 (de)
FR (1) FR2696421B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998006881A1 (en) * 1996-08-08 1998-02-19 Hoogovens Staal B.V. Steel, method for its manufacture, its use and product made from steel
WO2000040765A1 (de) * 1998-12-30 2000-07-13 Hille & Müller Gmbh & Co. Stahlband mit guten umformeigenschaften sowie verfahren zum herstellen desselben

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2124370A1 (de) * 1971-02-03 1972-09-22 Uss Eng & Consult
FR2179008A1 (de) * 1972-04-03 1973-11-16 Nippon Steel Corp
GB1384331A (en) * 1971-09-30 1975-02-19 Kawasaki Steel Co Hot-rolled low-carbon steel strip and process for the manufacture thereof
US3950191A (en) * 1974-10-21 1976-04-13 Kawasaki Steel Corporation Cold rolled steel sheets having an excellent enamelability and a method for producing said cold rolled steel sheets

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2124370A1 (de) * 1971-02-03 1972-09-22 Uss Eng & Consult
GB1384331A (en) * 1971-09-30 1975-02-19 Kawasaki Steel Co Hot-rolled low-carbon steel strip and process for the manufacture thereof
FR2179008A1 (de) * 1972-04-03 1973-11-16 Nippon Steel Corp
US3950191A (en) * 1974-10-21 1976-04-13 Kawasaki Steel Corporation Cold rolled steel sheets having an excellent enamelability and a method for producing said cold rolled steel sheets

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998006881A1 (en) * 1996-08-08 1998-02-19 Hoogovens Staal B.V. Steel, method for its manufacture, its use and product made from steel
NL1003762C2 (nl) * 1996-08-08 1998-03-04 Hoogovens Staal Bv Staalsoort, staalband en werkwijze ter vervaardiging daarvan.
CN1077145C (zh) * 1996-08-08 2002-01-02 霍戈文斯·斯塔尔公司 钢板或钢带、及其制造方法和应用
KR100493780B1 (ko) * 1996-08-08 2005-06-08 코루스 스타알 베.뷔. 포장용 강, 포장용 강 스트립 제조방법, 포장용 강 또는 강 스트립 사용방법, 및 포장용 강으로 제조된 포장용 강재 제품
WO2000040765A1 (de) * 1998-12-30 2000-07-13 Hille & Müller Gmbh & Co. Stahlband mit guten umformeigenschaften sowie verfahren zum herstellen desselben
EP1253209A2 (de) * 1998-12-30 2002-10-30 Hille & Müller GmbH Stahlband mit guten Umformeigenschaften sowie Verfahren zum Herstellen desselben
EP1253209A3 (de) * 1998-12-30 2005-03-02 Hille & Müller GmbH Stahlband mit guten Umformeigenschaften sowie Verfahren zum Herstellen desselben

Also Published As

Publication number Publication date
FR2696421B1 (fr) 1995-01-06
ES2118918T3 (es) 1998-10-01
DE69319292T2 (de) 1998-11-12
EP0592267B1 (de) 1998-06-24
DE69319292D1 (de) 1998-07-30
ATE167704T1 (de) 1998-07-15
JP3304173B2 (ja) 2002-07-22
FR2696421A1 (fr) 1994-04-08
JPH06220575A (ja) 1994-08-09

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