US3819085A - Lap side seam of metal, tubular body and method for making same - Google Patents

Lap side seam of metal, tubular body and method for making same Download PDF

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Publication number
US3819085A
US3819085A US23884072A US3819085A US 3819085 A US3819085 A US 3819085A US 23884072 A US23884072 A US 23884072A US 3819085 A US3819085 A US 3819085A
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Prior art keywords
lap
metal
side seam
tubular body
raw
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S Rohowetz
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Rexam Beverage Can Co
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American Can Co
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Priority to US23884072 priority Critical patent/US3819085A/en
Priority to GB370973A priority patent/GB1394932A/en
Priority to CA163,631A priority patent/CA1003350A/en
Priority to JP2723573U priority patent/JPS5513231Y2/ja
Priority to FR7309185A priority patent/FR2177811B2/fr
Priority to US44290674 priority patent/US3898945A/en
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Publication of US3819085A publication Critical patent/US3819085A/en
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)
Assigned to AMERICAN CAN PACKAGING INC. reassignment AMERICAN CAN PACKAGING INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: AMERICAN CAN COMPANY, A NJ CORP.
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    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • 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
    • B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner
    • B21D51/2676—Cans or tins having longitudinal or helical seams
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
    • B29C65/481—Non-reactive adhesives, e.g. physically hardening adhesives
    • B29C65/4815—Hot melt adhesives, e.g. thermoplastic adhesives
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/50—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like
    • B29C65/5064—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like of particular form, e.g. being C-shaped, T-shaped
    • B29C65/5071—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like of particular form, e.g. being C-shaped, T-shaped and being composed by one single element
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/50—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like
    • B29C65/5064—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like of particular form, e.g. being C-shaped, T-shaped
    • B29C65/5085—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like of particular form, e.g. being C-shaped, T-shaped and comprising grooves, e.g. being E-shaped, H-shaped
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
    • B29C66/4322—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms by joining a single sheet to itself
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • B29C66/7232—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer
    • B29C66/72321—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer consisting of metals or their alloys
    • 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
    • B65D7/00—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal
    • B65D7/12—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal characterised by wall construction or by connections between walls
    • B65D7/34—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal characterised by wall construction or by connections between walls with permanent connections between walls
    • B65D7/38—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal characterised by wall construction or by connections between walls with permanent connections between walls formed by soldering, welding, or otherwise uniting opposed surfaces
    • 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
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/36—Bending and joining, e.g. for making hollow articles
    • B29C53/38—Bending and joining, e.g. for making hollow articles by bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00—Layered products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00—Layered products
    • B29L2009/003—Layered products comprising a metal layer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1002—Methods of surface bonding and/or assembly therefor with permanent bending or reshaping or surface deformation of self sustaining lamina
    • Y10T156/1036—Bending of one piece blank and joining edges to form article
    • Y10T156/1038—Hollow cylinder article
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49885—Assembling or joining with coating before or during assembling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31786—Of polyester [e.g., alkyd, etc.]

Definitions

  • ABSTRACT An adhesively bonded, lap side seam of a primed metal, tubular body having a raw metal edge on the inside lap is provided with a protective thermoplastic resin coating on the raw metal edge of the inside lap and a thermoplastic adhesive wrapped around the resin coating and the interior and exterior surfaces of the inside lap.
  • the present invention relates to primed metal, tubular bodies formed with an adhesively bonded, lap side seam, and more particularly is concerned with the construction of the inside lap of the lap side seam.
  • the inside and outside lap i.e. the overlapped marginal portions
  • the inside and outside lap usually terminate in a raw, metal edge, due to prior shearing of the primed metal.
  • the outer surfaces of the tubular body, including the raw edge of the outside lap, may be protected readily against various forms of chemical attack by applying some sort of protective coating.
  • the instant invention utilizes a resin to form good adhesive bonds to the raw metal edge and in turn to the adhesive.
  • FIG. 1 is a perspective view of a tubular body with a lap side seam according to the present invention.
  • FIG. 2 is an enlarged, sectional view taken on the horizontal plane indicated by the line 2-2 of FIG. 1.
  • FIG. 1 illustrates a conventional metal canbody 11 having an adhesively bonded, lap side seam 13 according to the present invention.
  • the side seam 13 is formed by first priming metal sheet with conventional inside coatings 14 and outside coatings 16 such as epoxy-phenolic systems.
  • a varnish (not shown) is also applied on top of the outside coatings 16 but not in the area of the lap bond.
  • the varnish is generally an acrylic system and is not critical to the instant invention.
  • the primed, metal sheet is then cut to the desired blank size, thereby leaving a raw metal edge 15 (see FIG. 2) along at least one marginal portion of the primed blank and most likely a second raw metal edge 17 in a second marginal portion.
  • a raw metal edge 15 see FIG. 2
  • the lap side seam 13 can be formed without a raw metal edge 15 on the inside lap 19, there is no need to employ the present invention.
  • the raw edge 15 which is to be on the inside lap 19 is then run through a hot melt applicator which deposits a bead of a protective, thermoplastic resin 21 on the raw edge 15.
  • the applicator is conventional, and may comprise a grooved wheel. It may be desirable to warm up the raw edge 15 before the hot melt resin 21 is applied in order to achieve a good bond between the edge 15 and the hot melt resin 21.
  • Hot melt resins for this purpose are conventional polyamide polymers, and a preferred melt resin is General Mills Versalon XR- 1200 polyamide, a low molecular weight polyamide.
  • the protective resin 21 be applied to the raw metal edge 15 as a hot melt, rather than as a solution.
  • the hot melt method deposits a uniform and protective amount of resin over the sharp, irregular metal edge 15. Solution coating the metal edge 15 would not provide the required uniformity and protection, and cannot assure the maintainance of the bead throughout fabrication of the body 11 which is necessary to insure against cracks and crevices developing in the protective resin 21.
  • the next step in forming the lap side seam 13 consists of applying a thermoplastic adhesive 23, preferably a nylon, around the protective resin 21- and the interior and exterior surfaces of the inside lap 19.
  • the adhesive 23 may be extruded as a fluid rubbon around the resin 21 and the inside lap seam surfaces in conventional manner.
  • One such method consists of extruding the adhesive 23 onto either the interior or exterior surface of the inside lap 19 with an overhang that is then forced around the resin 21 and onto the other surface of the lap 19 by rolling, blowing with a gas, or other means.
  • FIG. 2 is illustrative of the bonded structure thus formed.
  • US. Pat. No. 3,066,063 provides alternative methods for applying the adhesive 23 and joining the inside lap 19 to the outside lap 25.
  • the particular protective resin 21 selected should adhere strongly to bare metal surfaces, possess low shrinkage on cooling for complete coverage of the raw edge 15, form strong bonds to the adhesive 23, have a melt temperature near that of the adhesive 23, and have a sufficiently high melt viscosity to remain in place during fabrication.
  • Various fillers such as clays, talcs, silicas, etc., can be added to the protective resin 21 for embodying purposes.
  • the particular adhesive 23 selected should form strong shear and peel bonds to the metal primer coatings, have a high melt viscosity to permit impact bonding, and possess a sufficiently-high melt temperature to allow subsequent coat bakes.
  • the adhesive 23 is applied along the interior surface of the inside lap 19 to the extent that it adheres to the inside coating 14 but not so that it interferes with the impact bonding step. As seen in FIG. 2 this is preferably about As to /1 the width of the side seam 13.
  • thermoplastic nylon adhesive wrapped around the resin coating and the interior and exterior surfaces of the inside lap.
  • thermoplastic resin is applied to the raw metal edge as a hot melt.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
  • Laminated Bodies (AREA)

Abstract

An adhesively bonded, lap side seam of a primed metal, tubular body having a raw metal edge on the inside lap is provided with a protective thermoplastic resin coating on the raw metal edge of the inside lap and a thermoplastic adhesive wrapped around the resin coating and the interior and exterior surfaces of the inside lap.

Description

United States Patent Rohowetz June 25, 1974 LAP SIDE SEAM OF METAL, TUBULAR BODY AND METHOD FOR MAKING SAME [75] Inventor: Stanley Edward Rohowetz,
Barrington, Ill.
[73] Assignee: American Can Company,
Greenwich, Conn.
[22] Filed: Mar. 28, 1972 [211 App]. No.: 238,840
[52] US. Cl 220/75, 161/214, 220/81 [51] Int. Cl B65d 7/34 [58] Field of Search", 161/214; 220/75, 81, 80
[56] References Cited UNITED STATES PATENTS 3,225,954 12/1965 Herrick et al 220/75 3,288,664 1l/1966 Hoppe 161/214 3,437,063 4/1969 Battersby 220/75 3,502,243 3/1970 Erlandson et a1 220/81 3,550,806 12/1970 Peerman et a1 161/214 3,582,507 6/1971 Peerman 161/214 3,616,963 11/1971 Sinnatt 161/214 3,650,999 3/1972 Martins et al 161/214 3,773,589 11/1973 Kaiser et al 220/75 R27,748 9/1973 Peerman et al 161/214 Primary Examiner-George F. Lesmes Assistant Examiner-William R. Dixon, Jr. A t n y, g nt, or Firm-Robert P. Auber; Law- 5 7] ABSTRACT An adhesively bonded, lap side seam of a primed metal, tubular body having a raw metal edge on the inside lap is provided with a protective thermoplastic resin coating on the raw metal edge of the inside lap and a thermoplastic adhesive wrapped around the resin coating and the interior and exterior surfaces of the inside lap.
2 Claims, 2 Drawing Figures PATENTEDJUNZS 1974 LAP SIDE SEAM OF METAL, TUBULAR BODY AND METHOD FOR MAKING SAME BACKGROUND OF THE INVENTION The present invention relates to primed metal, tubular bodies formed with an adhesively bonded, lap side seam, and more particularly is concerned with the construction of the inside lap of the lap side seam.
In the formation of a lap side seam in a metal, tubular body that has had a primer coating applied to the surfaces thereof, the inside and outside lap (i.e. the overlapped marginal portions) usually terminate in a raw, metal edge, due to prior shearing of the primed metal. The outer surfaces of the tubular body, including the raw edge of the outside lap, may be protected readily against various forms of chemical attack by applying some sort of protective coating.
However, it has been found to be exceedingly difficult to protect the raw, metal edge of the inside lap of the tubular body from chemical attack and corrosion owing to the contents contained within the tubular body. This is particularly true where the tubular body forms part of a container or can for beer or carbonated beverages. It has been found that where the raw metal edge is not covered with a resin coating which lies beneath the adhesive, that the contents eventually penetrate the adhesive and corrode the raw, metal edge, which may well lead to deterioration of the container as well as the contents therein.
The reason for much of the difficulty associated with the adhesively bonded, lap side seam is that the adhesive adheres to coated metal but not to raw metal, such as the edge of the inside lap. Thus, the instant invention utilizes a resin to form good adhesive bonds to the raw metal edge and in turn to the adhesive.
SUMMARY OF THE INVENTION BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a tubular body with a lap side seam according to the present invention.
FIG. 2 is an enlarged, sectional view taken on the horizontal plane indicated by the line 2-2 of FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENT Reference is now made to the drawings in describing a preferred embodiment of the present invention. FIG. 1 illustrates a conventional metal canbody 11 having an adhesively bonded, lap side seam 13 according to the present invention.
The side seam 13 is formed by first priming metal sheet with conventional inside coatings 14 and outside coatings 16 such as epoxy-phenolic systems. A varnish (not shown) is also applied on top of the outside coatings 16 but not in the area of the lap bond. The varnish is generally an acrylic system and is not critical to the instant invention.
The primed, metal sheet is then cut to the desired blank size, thereby leaving a raw metal edge 15 (see FIG. 2) along at least one marginal portion of the primed blank and most likely a second raw metal edge 17 in a second marginal portion. Of course, if the lap side seam 13 can be formed without a raw metal edge 15 on the inside lap 19, there is no need to employ the present invention. However, in forming cans today, there is virtually no way to avoid the raw metal edges 15 and 17 along the marginal portions of the body blank.
The raw edge 15 which is to be on the inside lap 19 is then run through a hot melt applicator which deposits a bead of a protective, thermoplastic resin 21 on the raw edge 15. The applicator is conventional, and may comprise a grooved wheel. It may be desirable to warm up the raw edge 15 before the hot melt resin 21 is applied in order to achieve a good bond between the edge 15 and the hot melt resin 21. Hot melt resins for this purpose are conventional polyamide polymers, and a preferred melt resin is General Mills Versalon XR- 1200 polyamide, a low molecular weight polyamide.
It is important that the protective resin 21 be applied to the raw metal edge 15 as a hot melt, rather than as a solution. The hot melt method deposits a uniform and protective amount of resin over the sharp, irregular metal edge 15. Solution coating the metal edge 15 would not provide the required uniformity and protection, and cannot assure the maintainance of the bead throughout fabrication of the body 11 which is necessary to insure against cracks and crevices developing in the protective resin 21.
The next step in forming the lap side seam 13 consists of applying a thermoplastic adhesive 23, preferably a nylon, around the protective resin 21- and the interior and exterior surfaces of the inside lap 19. The adhesive 23 may be extruded as a fluid rubbon around the resin 21 and the inside lap seam surfaces in conventional manner. One such method consists of extruding the adhesive 23 onto either the interior or exterior surface of the inside lap 19 with an overhang that is then forced around the resin 21 and onto the other surface of the lap 19 by rolling, blowing with a gas, or other means.
The adhesively wrapped blank is next fed to a conventional body maker, where the adhesive 23 is first heated, and then impact bonded to the outside lap 25. FIG. 2 is illustrative of the bonded structure thus formed. US. Pat. No. 3,066,063 provides alternative methods for applying the adhesive 23 and joining the inside lap 19 to the outside lap 25.
The particular protective resin 21 selected should adhere strongly to bare metal surfaces, possess low shrinkage on cooling for complete coverage of the raw edge 15, form strong bonds to the adhesive 23, have a melt temperature near that of the adhesive 23, and have a sufficiently high melt viscosity to remain in place during fabrication. Various fillers such as clays, talcs, silicas, etc., can be added to the protective resin 21 for embodying purposes.
The particular adhesive 23 selected should form strong shear and peel bonds to the metal primer coatings, have a high melt viscosity to permit impact bonding, and possess a sufficiently-high melt temperature to allow subsequent coat bakes.
Since both the protective resin 21 and the adhesive 23 are thermoplastic, there is no need for any curing,
3 thereby greatly simplifying the body fabricating process.
The adhesive 23 is applied along the interior surface of the inside lap 19 to the extent that it adheres to the inside coating 14 but not so that it interferes with the impact bonding step. As seen in FIG. 2 this is preferably about As to /1 the width of the side seam 13.
It is thought that the invention and many of its attendant advantages will be understood from the foregoing description and it will be apparent that various changes may be made in the form, construction and arrangement of the parts of the article and that changes may be made in the steps of the method described and their order of accomplishment without departing from the spirit and scope of the invention or sacrificing all of its material advantages, the form hereinbefore described being merely a preferred embodiment thereof.
What is claimed is:
1. In an adhesively bonded, lap side seam of a primed metal, tubular body having a raw metal edge on the inside lap, the improvement which comprises:
a protective, thermoplastic polyamide resin coating on the raw metal edge of the inside lap; and
a thermoplastic nylon adhesive wrapped around the resin coating and the interior and exterior surfaces of the inside lap.
2. The article of claim 1 wherein the protective thermoplastic resin is applied to the raw metal edge as a hot melt.

Claims (2)

1. In an adhesively bonded, lap side seam of a primed metal, tubular body having a raw metal edge on the inside lap, the improvement which comprises: a protective, thermoplastic polyamide resin coating on the raw metal edge of the inside lap; and a thermoplastic nylon adhesive wrapped around the resin coating and the interior and exterior surfaces of the inside lap.
2. The article of claim 1 wherein the protective thermoplastic resin is applied to the raw metal edge as a hot melt.
US23884072 1972-03-28 1972-03-28 Lap side seam of metal, tubular body and method for making same Expired - Lifetime US3819085A (en)

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Application Number Priority Date Filing Date Title
US23884072 US3819085A (en) 1972-03-28 1972-03-28 Lap side seam of metal, tubular body and method for making same
GB370973A GB1394932A (en) 1972-03-28 1973-01-25 Tubular bodies
CA163,631A CA1003350A (en) 1972-03-28 1973-02-13 Lap side seam of metal, tubular body and method for making same
JP2723573U JPS5513231Y2 (en) 1972-03-28 1973-03-03
FR7309185A FR2177811B2 (en) 1972-03-28 1973-03-14
US44290674 US3898945A (en) 1972-03-28 1974-02-15 Method for making a lap side seam on a metal tubular boby

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US23884072 US3819085A (en) 1972-03-28 1972-03-28 Lap side seam of metal, tubular body and method for making same

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US3819085A true US3819085A (en) 1974-06-25

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US44290674 Expired - Lifetime US3898945A (en) 1972-03-28 1974-02-15 Method for making a lap side seam on a metal tubular boby

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US44290674 Expired - Lifetime US3898945A (en) 1972-03-28 1974-02-15 Method for making a lap side seam on a metal tubular boby

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JP (1) JPS5513231Y2 (en)
CA (1) CA1003350A (en)
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GB (1) GB1394932A (en)

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US3949895A (en) * 1973-11-30 1976-04-13 Mobil Oil Corporation Epoxy exterior coating for lap-seam beverage cans
US4117188A (en) * 1976-05-17 1978-09-26 Hokkai Can Co. Ltd. Lapped seam can
US4346814A (en) * 1980-03-03 1982-08-31 American Can Company Side seam stripes
JPS59187544A (en) * 1983-04-09 1984-10-24 東洋製罐株式会社 Bonding can for winding and unsealing and manufacture thereof
US4858782A (en) * 1981-09-17 1989-08-22 Toyo Seikan Kaisha, Ltd. Metal vessel having circumferential side seam and process for production thereof
US4863063A (en) * 1982-11-15 1989-09-05 Toyo Seikan Kaisha, Ltd. Metal vessel having circumferential side seam
US5620135A (en) * 1994-04-07 1997-04-15 Ruediger Haaga Gmbh Container
WO2003106277A1 (en) * 2002-06-12 2003-12-24 Sonoco Development, Inc. Metalized seam seal for single wrap container
US7767049B2 (en) 2006-10-12 2010-08-03 Dixie Consumer Products Llc Multi-layered container having interrupted corrugated insulating liner
US8960528B2 (en) 2004-04-22 2015-02-24 Dixie Consumer Products Llc Insulating cup wrapper and insulated container formed with wrapper

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CA1088881A (en) * 1977-10-26 1980-11-04 Joseph L. Abbott Laminated tube for collapsible containers and method of making same
JPS5563908A (en) * 1978-11-02 1980-05-14 Fuji Shoji Kk Bead wire
GB2054410B (en) * 1979-06-30 1983-09-14 Toyo Seikan Kaisha Ltd Weld seam-coated cans and their production
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KR900001958B1 (en) * 1984-01-25 1990-03-27 도요세이깡 가부시끼가이샤 Method of and apparatus for covering weld zone of vertical wall of welded can with resin tape
US4792067B1 (en) * 1985-05-13 1999-02-16 Aptargroup Inc Mounting cup
US4813576A (en) * 1985-05-13 1989-03-21 Pittway Corporation Mounting cup
US4958757A (en) * 1985-05-13 1990-09-25 Pittway Corporation Ferrule for sealing with a container
DE19502992A1 (en) * 1995-02-01 1996-08-08 Brain Power Consulting Gmbh Process for producing hollow bodies and hollow bodies according to this method
NL1008467C2 (en) * 1998-03-04 1999-09-07 Hoogovens Staal Bv Method for the production of a thin-walled metal and a bus manufactured in this way.
KR101008503B1 (en) * 2006-04-17 2011-01-14 다이와 세칸 가부시키가이샤 Can container with screw
FR2942164B1 (en) * 2009-02-13 2011-03-18 Hutchinson FLEXIBLE LAMINATE FOR CRYOGENIC SEALING BARRIER, THIS BARRIER COMPRISING THE LAMINATE LAMINATE ON AN UNDERLYING LAMINATE AND METHOD FOR ASSEMBLING THE SAME
FR2944780B1 (en) * 2009-04-28 2011-06-10 Lablabo DEVICE FOR PACKAGING AND DISPENSING THE BOTTLE-POCKET TYPE
US9038819B2 (en) * 2012-06-22 2015-05-26 L&F Innoventions, LLC Wearable cleaning articles and container

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US3949895A (en) * 1973-11-30 1976-04-13 Mobil Oil Corporation Epoxy exterior coating for lap-seam beverage cans
US4117188A (en) * 1976-05-17 1978-09-26 Hokkai Can Co. Ltd. Lapped seam can
US4346814A (en) * 1980-03-03 1982-08-31 American Can Company Side seam stripes
US4858782A (en) * 1981-09-17 1989-08-22 Toyo Seikan Kaisha, Ltd. Metal vessel having circumferential side seam and process for production thereof
US4863063A (en) * 1982-11-15 1989-09-05 Toyo Seikan Kaisha, Ltd. Metal vessel having circumferential side seam
JPS59187544A (en) * 1983-04-09 1984-10-24 東洋製罐株式会社 Bonding can for winding and unsealing and manufacture thereof
US4553682A (en) * 1983-04-09 1985-11-19 Toyo Seikan Kaisha, Ltd. Bonded can of key-opening type and process for production thereof
JPS6326026B2 (en) * 1983-04-09 1988-05-27 Toyo Seikan Kaisha Ltd
US5620135A (en) * 1994-04-07 1997-04-15 Ruediger Haaga Gmbh Container
WO2003106277A1 (en) * 2002-06-12 2003-12-24 Sonoco Development, Inc. Metalized seam seal for single wrap container
US8960528B2 (en) 2004-04-22 2015-02-24 Dixie Consumer Products Llc Insulating cup wrapper and insulated container formed with wrapper
US7767049B2 (en) 2006-10-12 2010-08-03 Dixie Consumer Products Llc Multi-layered container having interrupted corrugated insulating liner

Also Published As

Publication number Publication date
CA1003350A (en) 1977-01-11
JPS5513231Y2 (en) 1980-03-25
FR2177811B2 (en) 1978-09-08
JPS4917842U (en) 1974-02-15
US3898945A (en) 1975-08-12
FR2177811A2 (en) 1973-11-09
GB1394932A (en) 1975-05-21

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