US3877605A - Easy opening container with safety edge compounds - Google Patents

Easy opening container with safety edge compounds Download PDF

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Publication number
US3877605A
US3877605A US398858A US39885873A US3877605A US 3877605 A US3877605 A US 3877605A US 398858 A US398858 A US 398858A US 39885873 A US39885873 A US 39885873A US 3877605 A US3877605 A US 3877605A
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US
United States
Prior art keywords
container
polymer
compound
score
mixtures
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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.)
Expired - Lifetime
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US398858A
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English (en)
Inventor
Walter A Fourier
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.)
Rexam Beverage Can Co
Original Assignee
American Can Co
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 American Can Co filed Critical American Can Co
Priority to US398858A priority Critical patent/US3877605A/en
Priority to AU64980/74A priority patent/AU480029B2/en
Priority to GB789874A priority patent/GB1437159A/en
Priority to DO1974002168A priority patent/DOP1974002168A/es
Priority to JP49070746A priority patent/JPS583898B2/ja
Priority to FR7431370A priority patent/FR2243874B2/fr
Priority to IT53097/74A priority patent/IT1019328B/it
Application granted granted Critical
Publication of US3877605A publication Critical patent/US3877605A/en
Assigned to AMERICAN CAN PACKAGING INC. reassignment AMERICAN CAN PACKAGING INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: AMERICAN CAN COMPANY, A NJ CORP.
Assigned to AMERICAN NATIONAL CAN COMPANY reassignment AMERICAN NATIONAL CAN COMPANY MERGER (SEE DOCUMENT FOR DETAILS). Assignors: AMERICAN CAN PACKAGING INC., NATIONAL CAN CORPORATION (CHANGED TO), TRAFALGAR INDUSTRIES, INC. (MERGED INTO)
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B21D51/44—Making closures, e.g. caps
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
    • B65D17/28—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness
    • B65D17/404—Details of the lines of weakness

Definitions

  • FIG.2 is a diagrammatic representation of FIG. 1
  • This invention relates to containers and in particular to new and improved easy opening ends for containers.
  • Plastisol materials proposed as safety edge compounds are basically vinyl chlorideresin containing suspensions in non-aqueous liquids which do not dissolve the resin at ordinary tempera-' ture, such liquids normally being plasticizers. Such suspensions can be converted to films by heating to approximately 340F to above 380F depending upon the type of plasticizer used. While the use of plastisols has afforded some protection from raw metal edges, such compounds are totally unsatisfactory for many applications.
  • a satisfactory safety edge compound should desirably possess the following properties for broad application and use; particularly for containers packed with edible goods:
  • Plastisols are decidedly deficient in many of the above mentioned criteria particularly where the container is to be packed with edible goods.
  • plastisols in general, do not meet FDA extractive levels. do not possess resistance to heat and moisture encountered under aseptic processing conditions and require specific primers for adhesion to substrates.
  • plastisols require special equipment for their manufacture, heavy duty pump equipment for application and high temperature curing ovens (they generally require temperatures above 380F for adequate curing) and once applied, the compositions frequently fragment or frill when the container is opened, and flows during the aspetic sterilization process.
  • Elastomeric polymers sometimes referred to in the art as rubber sealants have long been known in the art as excellent gasketing and end lining materials resulting in tough gaskets or seals having resistance to fat and oils, usually conveyed by inclusion of organic solvent-insoluble rubbers and resistance to moist heat, usually conveyed through use of a tackifying resin.
  • Such compositions are disclosed and claimed in US. Pat. No. 2,767,152, for example, and usually include a solvent-soluble rubber in combination with a solventinsoluble rubber, tackifying resin and filler, diluted with solvent to proper viscosity, to a solids content usually between about 34 to 40%.
  • compositions are not suitable for use as safety edge compounds as illustrated further hereinbelow because they are normally too highly elongated resulting in stringing or frilling when the structure is torn. Additionally, the tackifying resin necessarily present in gasketing or lining compounds to prevent deterioration and afford moist heat resistance, when employed in a safety edge compound inhibits drying of the film, causes blocking and sticking and other problems.
  • the primary object of this invention is to provide an improved easy-opening container with a safety feature which protects the ruptured score edge of the removable section as well as the metal edge remaining on the container.
  • Another object of the invention is to provide an easyopening container having protected metal edges employing safety edge compounds which possess all of the advantages above enumerated including resistance to fats and oils, resistance to heat, good adhesion to a variety of substrates, coated and unprimed, and proper elongation and tear properties.
  • This invention relates to an easy-opening container, preferably of the type having a full-open end closure seamed to a container body, wherein the end closure includes a peripheral countersink wall, a full-open removable central panel section defined by a peripheral score, an opening tab secured to the central panel and operative upon manipulation to impress an opening force to cause aa rupture in the score to leave a rim between the countersink wall and the score.
  • the improvement comprises providing a safety edge compound, comprising a mixture of an elastomeric polymer and a vinyl chloride polymer compounded with suitable fillers, on the score line to protect the metal edges upon rupturing the score.
  • FIG. 1 is a top plan view of an end closure of an easyopen container of this invention.
  • FIG. 2 is an enlarged fragmentary vertical section taken along line 2-2 of FIG. 1.
  • FIG. 3 is an enlarged fragmentary sectional view similar to H6. 2 showing a portion of the removable central panel section removed from the container body.
  • FlG. I shows a cylindrical can C having a conventional top end closure 10 having a central wall 12
  • Ingredients Parts By Weight Elastomeric polymer Polyvinyl chloride Filler
  • Epoxy Resin 50% to 75% preferably 65% to 70% 50% to 25% preferably 35% to 30% 200-500 parts per I00 parts of polymer mixture.
  • preferably 290-435 0 to 30 parts per I00 parts of polymer mixture
  • Central panel 24 has an opening tab 26 secured thereto by conventional means. for example. a rivet 28.
  • the opening tab. as illustrated in FIG. I. has a front portion 30 at one end adjacent score line 14 and a handle portion 32 at the other end.
  • the front poprtion 30 at one end adjacent score line 14 in this embodiment includes a web portion 36 having a U-shaped slit cut 38 therethrough which defines a flap 40 wherein is located the hole in which rivet 28 is secured.
  • the major portion of front end portion 30 lies outside of U-shapcd slit cut 38 so that when handle 32 is lifted upwardly. the front end portion 30 and the rest of tab 26 are free to'pivot about rivet 28 to allow nose 34 to rupture score line 14. while flap 40 is held flatly against central panel 12 by rivet 28.
  • the opening tab as illustrated is described only as a specific embodiment herein and it should be understood that other suitable forms of the opening tab may be substituted.
  • a secondary score may be formed in the central panel although the invention is equally applicable to structures devoid of such an auxiliary score.
  • a safety edge compound 46 comprising an clastomeric polymer is present on the undcrsurface of removal panel section 24 adjacent and covering score line l4 (and score line l5 if present) to protect the edge of the panel section 24 and the rim l6 once the score is ruptured and panel 24 is
  • the relative proportions of the components should be maintained within the stated ranges. For example. compositions containing substantially less than 50% elastomer or more than 507(- vinyl polymer result in compounds that are too brittle and friable and lack suitable adhesion for the purposes of )he invention. Conversely. more than 75% elastomer or less than vinyl polymer results in compounds that are too stringy and soft for satisfactory use both as a safety edge compound and in conventional nozzle equipment.
  • An optional ingredient of the composition may be an epoxy resin as indicated above. It has been found with some compositions of the invention that the presence of the additional resin may aid in the fat resistance of the compound and additionally adds favorably to the tearing characteristics thereof. It will be understood. however. that such compounds are not mandatory and satisfactory results are obtained in the absence of such optional ingredients.
  • the clastomeric polymer component of the compounds of the invention are well known in the art and include butadiene-acrylonitrile copolymers. butadienestyrene copolymers. isobutylene-isoprene copolymers. natural rubber (polyisoprene). ethylene-propylene copolymer. neoprene. polyacrylic rubber. chlorosulfonated polyethylene (Hypalon). etc. and mixtures thereof. Especially preferred are mixtures of soluble clastomers. particularly those including butadieneacrylonitrile polymers containing about to about 72 percent by weight butadiene and about 28 to 50 percent acrylonitrile.
  • the vinyl chloride resin used is a resinous polymer of vinyl chloride or copolymers thereof with minor proportions of other vinyl monomers such as vinyl acetate. vinyl butyrate, vinyl alcohol. vinylidcne chloride. vinyl ethyl ether and the like and mixtures thereof.
  • the particular monomer employed in making the copolymers is not critical as long as the essential character of the vinyl chloride resin is not changed by the incorporation of these monomers. In general. eopolymers containing up to based upon the weight of the copolymer. may be employed.
  • the vinyl chloride resin employed herein is preferably a long-chain resin having a number average molecular weight of about [5.000 or above such as (icon I'll. (icon 222. Vinyl VAGH. etc.
  • the vinyl chloride resin-elastomer may be a prelluxcd or separate ingredient mixture of vinyl chloride rcsin-clastomer.
  • l'hc epoxy resin components are well known in the art and are readily available commercially.
  • a suitable epoxy resin is Epon 100].
  • the tiller component of the compounds ol'the invention is likewise selected from compounds well known in the art and includes titanium dioxide. silica. zinc oxide. lluca clay. tale. hydrated alumina and other tillers that function in accordance with the present invention. lispecially preferred is a hydrated alumina. commercially available as llydrated alumina (-33 l Aluminum (ompany of America.
  • the effect ol'this particular liller component when employed in the safety edge compounds of the invention has been especially satisfactory- For example. it has been possible to readily obtain thicker layers of product. e.g. of the order of about 0.015 to 0.025 ittchcs as compared to 0.008 to 0.0l2 inches when other fillers are employed.
  • Such increased thicknesses of protective product is highly desirable and conveys. among other advantages. increased protection against cutting to the consumer.
  • Such components may be employed alone. in combination with each other or with other fillers and/or pigments well known in the art.
  • the liquid medium or vehicle employed herein may include suitable solvents or diluents which may be selected to form solutions. dispersions. etc.. based on the solubility of the particular polymer. ease of drying and ecological properties. as desired.
  • the vehicle may include water. organic and inorganic solvents diluents and combinations thereof. Particularly preferred herein are organic solvents. especially aromatic and aliphatic hydrocarlmns. ketones and cyclic ethers such as toluene. methyl ethyl ketone. acetone. diosanc. tetrahydrofuran. methyl isohutyl ketone. hexane. hcptanc and mixtures thereof. Methyl ethyl ketone. toluene. and mixtures thereof are especially preferred herein.
  • the ingredients may be mixed in any order desired.
  • the filler will be added to the vehicle. with or without milling as deemed necessaryafter which the polymer mixture will be added. preferably with agitation to aid in solvation or dispersion of the same.
  • metal sheet which may be aluminum. tinplate. tin-free steel. etc.. is coated with typical primer coatings which may be any of a variety of conventional coatings including oleoresinous lacquers or enamels such as tung oil or linseed oil based materials. epoxy esters. epoxy-phenolics. acrylics. vinyls. etc.
  • the primed sheet is formed into the basic end and converted to an inside or outside scored full-panel. easy-open end by any of conventional procedures known in the art.
  • a safety edge compound of the invention is applied to the score area by any suitable means. employing preferably conventional nozzle equipment. and is dried to evaporate at least a portion of the vehicle. utilizing standard equipment. for example. a helical dryer.
  • the primary score land may be of any length desired. generally from about 0.001 to 0.005 inch and may be formed by either an inside or outside score.
  • the secondary score depth. when present. will be substantially less than that of the primary score. normally about 0.003 inch less than the primary score. likewise may be on the interior or exterior surface of the end.
  • Thicknesses of the safety compounds may vary as desired and preferably will be in the range of about 4 to 25 mils with 8 to l5 mils being the preferred range except as above noted when hydrated alumina is employed.
  • the width of the compound as applied likewise may vary as desired. usually from about a 544 inch minimum to as wide as desired and as is economically feasible.
  • the compound may or may not be applied to cover the secondary score. as desired althoughit will preferably cover both the primary and secondary score in the practice of this invention. Similarly. the compound may be applied to the interior or exterior surface of the end with interior application being most preferred herein.
  • EXAMPLE Vl This formulation is a typical plastisol employed as a safety edge compound:
  • Butyl hydroxytoluene 0.15 (Antioxidant) Barium-cadmium complex 0.15 (Stabilizer) The above formulations (Examples 1 to VI) were applied to a primed, scored, metal end and dried until a substantial amount of vehicle was evaporated.
  • the compositions of Examples 1 to 1V had a solids content of about 64 percent, were applied with a nozzle and were dried at 130F.
  • the composition of Example V had a solids content of about 36 percent, was likewise applied with a nozzle and dried at 130F.
  • the composition of Example Vl had a viscosity of about 25,000 centipoises, was applied by roller coater and dried at a temperature of about 340F.
  • Example V The compound of Example V was found to be totally unsatisfactory for use as a safety edge compound. Drying was inhibited by the tackifying resin necessitating at the least doubling of drying time. Upon rupturing the score line, the compound of this example was excessively stringy and found to be too soft to give raw edge protection. Additionally, ends containing compounds of this example was extremely difficult to process because of the tackiness of the compounds which caused blocking or sticking of the ends one to the other.
  • Example Vl had unsatisfactory adhesion in the absence of a special vinyl primer, for example an acrylic-epoxy-phenolic coating, and only provided partial protection to the scored metal, generally only partially to the removable central panel with little or no rim protection.
  • a special vinyl primer for example an acrylic-epoxy-phenolic coating
  • the dried compound was not sufficiently resistant to heat to be suitable for use on containers subjected to aseptic sterilization or thermal heat processing.
  • Examples 1 to IV were not tacky, did not block, provided excellent protection to the metal edges including those of the removable panel and the rim, tearing cleanly and easily without stringing, fragmenting or frilling, exhibited good retention of adhesion to the metal ends, were resistant to fat and heat and suitable for use under aseptic conditions.
  • a metal container wherein a full-open end closure is seamed to a container body, wherein the end closure includes a peripheral countersink wall, fullopen removable central panel defined by a substantially peripheral score line and an opening tab secured to the central panel and operative upon manipulation to cause a rupture in the score to leave a rim between the countersink wall and the score, the improvement which comprises:
  • a composition having a solids content of from about 45 to about percent by weight comprising a polymer mixture consisting essentially of from about 50 to about 75 percent by weight of an elastomeric polymer or mixtures thereof and from about 50 to about 25 percent by weight of a vinyl chloride polymer, liquid vehicle and filler, said compound covering the score to protect the metal edges of the removable panel section and the rim upon rupture of the score.
  • composition contains about 200 to 500 parts of filler per 100 parts of polymer mixture.
  • composition additionally contains up to about 30 parts, per 100 parts of polymer, of an epoxy resin.
  • elastomer is selected from the group consisting of copolymers of butadieneacrylonitrile, butadiene-styrene, isobutyleneisoprene, ethylenepropylene, polyisoprene, neoprene, polyacrylic rubber, chlorosulfonated polyethylene and mixtures thereof.
  • said vinyl chloride polymer is derived from vinyl chloride or mixtures thereof with at least one of vinyl acetate, vinylidene chloride, and vinyl alcohol.
  • a method for making an improved, full-open end closure comprising, in combination:
  • a. forming a can end including a peripheral countersink wall and flange means to be seamed to the end of a container body,
  • composition additionally contains up to about 30 parts, per parts of polymer, of an epoxy resin.
  • said elastomer is selected from the group consisting of copolymers of butadiene-acrylonitrile, butadiene-styrene, isobutyleneisoprene, ethylene-propylene, polyisoprene, neoprene, polyacrylic rubber, chlorosulfonated polyethylene and mixtures thereof.
  • said vinyl chloride polymer is derived from vinyl chloride or mixtures thereof with at least one of vinyl acetate, vinylidene chloride and vinyl alcohol.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Containers Opened By Tearing Frangible Portions (AREA)
US398858A 1973-09-19 1973-09-19 Easy opening container with safety edge compounds Expired - Lifetime US3877605A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US398858A US3877605A (en) 1973-09-19 1973-09-19 Easy opening container with safety edge compounds
AU64980/74A AU480029B2 (en) 1973-09-19 1974-01-30 Easy opening container with safety edge compounds
GB789874A GB1437159A (it) 1973-09-19 1974-02-21
DO1974002168A DOP1974002168A (es) 1973-09-19 1974-03-08 Envase facil de abrir con borde de componentes de seguridad
JP49070746A JPS583898B2 (ja) 1973-09-19 1974-06-20 カイカンエンブホゴヨウコンパウンドオユウスル イ−ジ−オ−プンカン
FR7431370A FR2243874B2 (it) 1973-09-19 1974-09-17
IT53097/74A IT1019328B (it) 1973-09-19 1974-09-19 Perfezionamento nei contenitori ad apertura facilitata muniti di rivestimento protettivo degli spigoli

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US398858A US3877605A (en) 1973-09-19 1973-09-19 Easy opening container with safety edge compounds

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US3877605A true US3877605A (en) 1975-04-15

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US398858A Expired - Lifetime US3877605A (en) 1973-09-19 1973-09-19 Easy opening container with safety edge compounds

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US (1) US3877605A (it)
JP (1) JPS583898B2 (it)
DO (1) DOP1974002168A (it)
FR (1) FR2243874B2 (it)
GB (1) GB1437159A (it)
IT (1) IT1019328B (it)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4592861A (en) * 1984-06-08 1986-06-03 Uniroyal Chemical Company, Inc. Antistatic thermoplastic composition comprising a graft polymer, halogenated thermoplastic polymer and conductive carbon black
US5069356A (en) * 1990-11-08 1991-12-03 Automated Container Corporation Easy open end with temporary retention center for safety purposes

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4006700A (en) * 1975-05-05 1977-02-08 Usm Corporation Method for making container closures
GB1600353A (en) * 1978-05-31 1981-10-14 Airfix Ind Ltd Containers

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2767152A (en) * 1953-04-10 1956-10-16 American Can Co Gasket composition, including both hydrocarbon soluble and insoluble rubbers
US2984583A (en) * 1956-10-05 1961-05-16 Degussa Process for the coating of surfaces and objects
US3463348A (en) * 1968-04-01 1969-08-26 Container Corp Safety can
US3510022A (en) * 1968-10-17 1970-05-05 Paul H Heller Removable tab having a protective coating
US3563402A (en) * 1968-02-09 1971-02-16 Heinrich Arnold Plastic gasket rings and gasket linings
US3744668A (en) * 1970-07-31 1973-07-10 Continental Can Co Score edge protection
US3747797A (en) * 1971-10-19 1973-07-24 Aluminum Co Of America Laminated container wall

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2767152A (en) * 1953-04-10 1956-10-16 American Can Co Gasket composition, including both hydrocarbon soluble and insoluble rubbers
US2984583A (en) * 1956-10-05 1961-05-16 Degussa Process for the coating of surfaces and objects
US3563402A (en) * 1968-02-09 1971-02-16 Heinrich Arnold Plastic gasket rings and gasket linings
US3463348A (en) * 1968-04-01 1969-08-26 Container Corp Safety can
US3510022A (en) * 1968-10-17 1970-05-05 Paul H Heller Removable tab having a protective coating
US3744668A (en) * 1970-07-31 1973-07-10 Continental Can Co Score edge protection
US3747797A (en) * 1971-10-19 1973-07-24 Aluminum Co Of America Laminated container wall

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4592861A (en) * 1984-06-08 1986-06-03 Uniroyal Chemical Company, Inc. Antistatic thermoplastic composition comprising a graft polymer, halogenated thermoplastic polymer and conductive carbon black
US5069356A (en) * 1990-11-08 1991-12-03 Automated Container Corporation Easy open end with temporary retention center for safety purposes

Also Published As

Publication number Publication date
AU6498074A (en) 1975-07-31
FR2243874A2 (it) 1975-04-11
FR2243874B2 (it) 1978-04-28
JPS5055487A (it) 1975-05-15
DOP1974002168A (es) 1976-04-06
GB1437159A (it) 1976-05-26
JPS583898B2 (ja) 1983-01-24
IT1019328B (it) 1977-11-10

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AS Assignment

Owner name: AMERICAN CAN PACKAGING INC., AMERICAN LANE, GREENW

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:AMERICAN CAN COMPANY, A NJ CORP.;REEL/FRAME:004835/0338

Effective date: 19861107

Owner name: AMERICAN NATIONAL CAN COMPANY

Free format text: MERGER;ASSIGNORS:AMERICAN CAN PACKAGING INC.;TRAFALGAR INDUSTRIES, INC. (MERGED INTO);NATIONAL CAN CORPORATION (CHANGED TO);REEL/FRAME:004835/0354

Effective date: 19870430

Owner name: AMERICAN CAN PACKAGING INC., CONNECTICUT

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:AMERICAN CAN COMPANY, A NJ CORP.;REEL/FRAME:004835/0338

Effective date: 19861107

Owner name: AMERICAN NATIONAL CAN COMPANY, STATELESS

Free format text: MERGER;ASSIGNORS:AMERICAN CAN PACKAGING INC.;TRAFALGAR INDUSTRIES, INC. (MERGED INTO);NATIONAL CAN CORPORATION (CHANGED TO);REEL/FRAME:004835/0354

Effective date: 19870430