CA1138793A - Composite container - Google Patents
Composite containerInfo
- Publication number
- CA1138793A CA1138793A CA000343568A CA343568A CA1138793A CA 1138793 A CA1138793 A CA 1138793A CA 000343568 A CA000343568 A CA 000343568A CA 343568 A CA343568 A CA 343568A CA 1138793 A CA1138793 A CA 1138793A
- Authority
- CA
- Canada
- Prior art keywords
- flange
- area
- closure
- compound
- layer
- 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.)
- Expired
Links
Abstract
ABSTRACT OF THE DISCLOSURE
An improved hermetically sealed composite container formed by double-seaming a pair of compounded metal ends to extended length flanges on the opposite ends of a can body so that the compound is bonded to an inner liner on the can body to provide an effective seal, The compound material is placed in the seaming panel and curl area of the metal ends so as to provide a more extensive seal area when the metal ends are double-seamed with the extended flanges on the can body. The extended length flanges provide a considerably greater contact area between the can body inner liner and the metal ends when the metal ends are double-seemed to the can body.
An improved hermetically sealed composite container formed by double-seaming a pair of compounded metal ends to extended length flanges on the opposite ends of a can body so that the compound is bonded to an inner liner on the can body to provide an effective seal, The compound material is placed in the seaming panel and curl area of the metal ends so as to provide a more extensive seal area when the metal ends are double-seamed with the extended flanges on the can body. The extended length flanges provide a considerably greater contact area between the can body inner liner and the metal ends when the metal ends are double-seemed to the can body.
Description
13 BACKG~OUl~D OF THE INV~E~TION
14 ~ This invention relates to containers and, more par-16 ticularly, it relates to containers constructed of relatively 16 low strength materials which are well-suited for packaging 17 products requiring increased structural integrity and a hermetic 18 seal, such as food and/or pressure-producing products.
It is very desirable to have an inexpensive container 20 suitable for packaging various food items and pressure-producing 21 products, such as carbonated beverages ana beer. However, 22 suitable containers for such products have been rather expensive 23 due to the high strength characteristics necessary to maintain 24 the hermetic seal. ~ -In recent years, there have been introduced a number 26 of different types of lightweight, composite containers con-27 structed of low strength materials which are considerably less 28 expensive than the commonly-used tin plate and aluminum con-29 tainers~ Such inexpensive containers normally are comprised 8~ o ~ cylindrica1 composite can body closed at both ends by 31 :
.
~ , , . , qF
. :
, ., _ . 14800 F~rm Z33 C ~ 1138~
--1 metal caps which are attached to the body by a standard double-
14 ~ This invention relates to containers and, more par-16 ticularly, it relates to containers constructed of relatively 16 low strength materials which are well-suited for packaging 17 products requiring increased structural integrity and a hermetic 18 seal, such as food and/or pressure-producing products.
It is very desirable to have an inexpensive container 20 suitable for packaging various food items and pressure-producing 21 products, such as carbonated beverages ana beer. However, 22 suitable containers for such products have been rather expensive 23 due to the high strength characteristics necessary to maintain 24 the hermetic seal. ~ -In recent years, there have been introduced a number 26 of different types of lightweight, composite containers con-27 structed of low strength materials which are considerably less 28 expensive than the commonly-used tin plate and aluminum con-29 tainers~ Such inexpensive containers normally are comprised 8~ o ~ cylindrica1 composite can body closed at both ends by 31 :
.
~ , , . , qF
. :
, ., _ . 14800 F~rm Z33 C ~ 1138~
--1 metal caps which are attached to the body by a standard double-
2 seaming method In this standard double-seaming method, a 8 curved extension of the metal end is folded over together with 4 a flange portion on the fiber can body so as to form a double-6 seam joint. Such standard fiber containers have expexienced 6 di~ficult~ in packaging cer-tain food- items and certain pressùre-q producing products because the joint between the metal ends -8 and the iber body has;not exhibited sufficient strength to ; . 9 maintain a hermetic seal and to withstand the pressure of the 10 products container therein. Thus, end seam failure was fre-11 ~uently experienced when attempts were made to uso standard.
12 double-seamed fiber cans for packaging pressure-producing 18 products. Thus, even though standard fiber containers are 1~ much lighter in weight and less expensive than.the stronger 1C metal containers, they have not been suitable for use in pack-1~ aging certain food items and some préssure-producing products.
.
17 An improved hexmetically sealed composite container 18 was provided in my U. S. Patént ~o. 3,580,464 which issued on .
19 May 25, 1971. The improved composite container disclosed in 20 this-patent features the use of a compound matexial on the 21 metal ends which, when heated, will form a bond with a thermo-22 plastic material incorporated into the inner liner of the com-~g posite can body. Thus, this configuration provided both ~a 2~ mechanical double-seamed joint and a chemical-type bond which 26 aided in providing a hermetic seal and withstanding the increased 26 pxessure of pressure-producing products. However, it has been 27 found that while the configuration of my U. S. Patent No.
28 3,580,464 was a considerable improvement over the existing 29 pxior art composite containers, it does not provide the neces-80 sary structural integrity required for packaging and shipping certain ~ . 14800 ForM ~33 C. ~ ~3 1~38793 food items and other pressure-producing products. It has been.
found that during shipping certain impacts-to the side area of the double-seamed end configuration could result in a reduc-4 tion of the hermetic seal and loss of pressure from within the ~ container 6 Thus, there is a continuing need for~ and it is a~
7 object of this invention to provide, an inexpensive container 8 w~ich provides improved strength to maintain a hermetic seal g for successful packaging of ~ood ite~s and pressure-producing lo products 11 Other objects, features and advantages of this inven-1Z tion will become obvious to those skilled in the art upon 18 reference to the following detailea description and the drawings 1~ illustrating a preerred embodiment thereof.
16 ~N T~E DRAwI~Gs 16 FIG. l is a front elevational view.of a lightweight 17 composite container with parts broken away in section and 18 incorporating the metal ena attaching means of this invention.
1~ FIG. 2 is an enlarged sectional view of a compounded 20 container end and the extended flange poxtion of a can body to 21 which it is to be joined~
.22 FIG. 3 is a sectional view of the components of 2g FIG. 2 showing them in the final seaied relationship.
. . 24 SUMMAR~ OF THE I~VENTION .: .
2~ In general, this invention provides a substantially 26 rigid container which may be constructed of fiber, plastic, 27 lightweight metal, or combinations of such materials and which 8 is adapted to provide a strong double-seamed joint between the zg metal end members and the can body wall This invention pro-so vides for the use of metal ends which include compound materiaL
s2 14BOo por~a 2J3 C'~` 1138793 C
.
1 throughout their curl area and extended flange portions-on the 2 composite can body to facilitate an improved joint and seal ~ between the metal ends and the can body. In addition, the 4 compound is adapted to form a bond with an inner liner layer 6 on the can bod~.
6 DESCRIPTIO~ OF THE PREFERRED EMBODIME~T
7 Although the preferred embodiment, as shown in 8 FIGS. 1-3, features a composite type container, it should be g clear that thé invention is equally well-suited to be used in o combination with a thin-walled container constructed of plastic 11 and other materials.
12 More particularly, FIG. 1 shows a cylindrical con-18 tainer 10 formed from a thin-walled composite can body 12 and 1~ a pair of metal end closures 14 and 16.
1~ The construction of the cylindrical composite can 16 body 12 can best be seen by reference to FIGS. 2 and 3. The Iq can body 12 is comprised of a layer of structural material 18 18 sandwiched between an outer label 19 and an innex liner 20 1~ which is laminated or bonded to the inside of the structural 20 material 18. It should be understood that a variety of different 21 materials can be utilized to produce the structural material 22 layer 18, the outer label lg, and the inner liner 20. As .. . .
23 examples of suitable such materials, the inner liner 20 may be 2~ formed of a lamination of 01001 in. polypropylene film/0.00035 in 2G aluminum foil/0 0005 in. low-density polyethylene/and 25 lb per 26 ream paper, which may be extensible graae kraft paper or 3/4 mil 27 surlyn/0.00035 "aluminum foil/O.OOos~ low-density polytheylenej 28 25 lb. per ream paper. The structural material layer 18 coula 29 be formed from a number of layers of can stock grade natural 80 kraft. The outer label 19 may be eithex 0.001 high-density ~1 ' ' .
Fo~ 33 - 1138793 I polyethylene~25 lb. per ream natural kraft Eaper or 0.0003 2 aluminum foil/25 lb. per ream natural krat paper. In addition~
8 40-55 lb. per ream coatea bleached paper grades may also be 4 used as label stoc~. The high-density polyethylene, aluminum 6 foil, or coated.bleached paper in these e.~amples for the outer 6 label 19 would serve,as an outer protective coating for the 7 structural material~ Likewise, the inner liner 20 formed of 8 polyp~opylene f~m, aluminum foil, and low-density polyethylene ', 9 is positioned so as to be in contact with the pxoduct being lo contained within the,container 10 and keeps the product out 11 of contact with ,he structural layer 18 . .
12 , An important feature of this invention is the pro-1~ vision of an extended length attaching flange 22 at each end 1~ of the fiber can body 12. Typical flange extension obtained 1~ in conventional flanging methods now being used in the manu-16 facture of composite cans resuIts in a flange length (see "L"
17 in FIG- 2) of .030--050 in- measured from-outer bodywall surface 18 depending on the can size,and the materials used. Flange -19 extension obtained in this invention results in a flange length 20 of ,075-.090 in. It is suggested that the can,body be formed 21 approximately 3/32 of an inch longer than standaxd can bodies 22 currently used for the same size.can to provide additional ..
23 material to form the extended length flanges 22. It is further 2~ suggested that the extended length flanges 22 be formed as 2S shown in FIG 2 so that they are positioned in a generally 26 perpendicular relationship with the can body 12.
27 The metal end closures 14 and 16 are of a standard 28 type used in connection with hermetically sealea cans and may 29 be identical with each other. For the purpose of illustration, 80 FIGS 2 and 3 depict the sequence of uniting the end closure 16 ~2 ~5-1~80~) For~ 233 ( ~3 li 38793 C
1 to the can body 12. It should be understood that the end 2 closure 14 is attached to the opposite end of the can body 8 12 in an identical procedure. The metal end closure 16, as shown in FIGS. 2 and 3, includes a center panel 24, a chuck ~ wall 26, a shoulder area 28, a seaming panel 30, and a cover 6 hook area 32. An important feature of this invention is the' ' provision of a quantity of compounding composition 34 which is 8 strategically positioned across the entire seaming panel 30 g and extend$ partially into the shoulder area 28 and the cover lo hooX area 32~ Such compound normally has been positioned 11 only in the shoulder area of a metal end which is to be double-12 seamed to a composite can body. Thus, as will be seen in 18 re,erence to FIG. 3, the use of the extended flange 22 and the positioning of the compound material 34 results in a ~uch 1~ increased contact area between the metal end and the can body 16 inner liner when they are double-seamed together to form the configuration of FIG 3. Although any suitable compound may be used, a recommended e~ample of a suitable such end lining 19 compound is Compound No. 1105, which is manufactured by the 20 Dewey & Almy Chemical Division o~ W. R. Grace and Company.
21 As can be seen in the transition of FIG. 2 to FIG. 3, when the 22 metal end closure 16 is double-seamed into engagement with the' , . , . ' . ':
23 extended flange 22, a structurally sound joint is formed be-24 tween the metal end closure 16 and the can body 1~., The c,on-26 figuration of this invention results in a relatively lon,g z6 surface area contact between the compouna material 34 and the z7 inner liner 20 on'the can body to thereby form a rather exten-z8 sive bonding area to create an effective hermetic seal between 29 the metal end closure and the can body. Both internal pressure ~ build-up and physical damage to the end chine area tend to sl .
~2 --6--'~O~ ~33 ' ~
.
1 pull the chuck wall area 26 aw~y from the can body, thereby 2 damaging the primar~ seal which is formed in this area. The subject invention avoids this problem b~ relocating the pri-mary seal ta the extende~ flange and curl are,a. These areas 6 tend to be tightened thereby creating an improved primary 6 seal during distortion of the chuck wall area.
7 Thus, the'use of the extended flange 22 and the 8 positioning of the compound 34 creates both an effective her-g metic seal and a structural joint having considerably improved lo strength over previously utilized double-seamed joint For ~1 example, abuse tests comparing the new improved conæiguration 12 Of this invention with a standard double-seamed.joint'have 13 shown that 26.4% of the standard double-seamed joint cans 14 exhibited a loss of hermetic seal due to damage of the end 1~ seam compared with only 2.8~ of the cans featuring the improved 16 extended flange concept of this invention~ ' It should be noted that the metal end closures may.
'18 be heated as taught in my previously mentioned U S. Patent 19 ~~ 3,580,464 so as to aid in the bonding of the compound material 20 with the inner liner on the fiber can body.. However, it has, 21 also been found that the use of the extended flange,and the 22 positioning of the'compound of this invention will provide 23 both a vastly improved hermetic seal and a stronger aouble-', 24 seamed joint even without the specific application of heat 2~ when compared with standard double-seamed joints. Hence, it 26 is clear that the unique structuxe of the subject invention 27 results in a lightweight and inexpensive contai~er which exhibits 28 strength properties heretofore unknown in such containers~ and z~ is capable of both providing an improved hermetic seal for 8~ food products and withstanding the pressures associated with ~1 8~ ' 7 1~800 f`, f Fo~m,333 ~ C~-3 C,~
` "` 1138793 1 pressure-producing products~ such as carbonated beverages 2 and beer. As a result, the desirable use o~ inexpensive, 8 lightweight containers has been extended to additional products beyond those that are currently packaged in such containexs~
'.
g lo 2~
2~
~2
12 double-seamed fiber cans for packaging pressure-producing 18 products. Thus, even though standard fiber containers are 1~ much lighter in weight and less expensive than.the stronger 1C metal containers, they have not been suitable for use in pack-1~ aging certain food items and some préssure-producing products.
.
17 An improved hexmetically sealed composite container 18 was provided in my U. S. Patént ~o. 3,580,464 which issued on .
19 May 25, 1971. The improved composite container disclosed in 20 this-patent features the use of a compound matexial on the 21 metal ends which, when heated, will form a bond with a thermo-22 plastic material incorporated into the inner liner of the com-~g posite can body. Thus, this configuration provided both ~a 2~ mechanical double-seamed joint and a chemical-type bond which 26 aided in providing a hermetic seal and withstanding the increased 26 pxessure of pressure-producing products. However, it has been 27 found that while the configuration of my U. S. Patent No.
28 3,580,464 was a considerable improvement over the existing 29 pxior art composite containers, it does not provide the neces-80 sary structural integrity required for packaging and shipping certain ~ . 14800 ForM ~33 C. ~ ~3 1~38793 food items and other pressure-producing products. It has been.
found that during shipping certain impacts-to the side area of the double-seamed end configuration could result in a reduc-4 tion of the hermetic seal and loss of pressure from within the ~ container 6 Thus, there is a continuing need for~ and it is a~
7 object of this invention to provide, an inexpensive container 8 w~ich provides improved strength to maintain a hermetic seal g for successful packaging of ~ood ite~s and pressure-producing lo products 11 Other objects, features and advantages of this inven-1Z tion will become obvious to those skilled in the art upon 18 reference to the following detailea description and the drawings 1~ illustrating a preerred embodiment thereof.
16 ~N T~E DRAwI~Gs 16 FIG. l is a front elevational view.of a lightweight 17 composite container with parts broken away in section and 18 incorporating the metal ena attaching means of this invention.
1~ FIG. 2 is an enlarged sectional view of a compounded 20 container end and the extended flange poxtion of a can body to 21 which it is to be joined~
.22 FIG. 3 is a sectional view of the components of 2g FIG. 2 showing them in the final seaied relationship.
. . 24 SUMMAR~ OF THE I~VENTION .: .
2~ In general, this invention provides a substantially 26 rigid container which may be constructed of fiber, plastic, 27 lightweight metal, or combinations of such materials and which 8 is adapted to provide a strong double-seamed joint between the zg metal end members and the can body wall This invention pro-so vides for the use of metal ends which include compound materiaL
s2 14BOo por~a 2J3 C'~` 1138793 C
.
1 throughout their curl area and extended flange portions-on the 2 composite can body to facilitate an improved joint and seal ~ between the metal ends and the can body. In addition, the 4 compound is adapted to form a bond with an inner liner layer 6 on the can bod~.
6 DESCRIPTIO~ OF THE PREFERRED EMBODIME~T
7 Although the preferred embodiment, as shown in 8 FIGS. 1-3, features a composite type container, it should be g clear that thé invention is equally well-suited to be used in o combination with a thin-walled container constructed of plastic 11 and other materials.
12 More particularly, FIG. 1 shows a cylindrical con-18 tainer 10 formed from a thin-walled composite can body 12 and 1~ a pair of metal end closures 14 and 16.
1~ The construction of the cylindrical composite can 16 body 12 can best be seen by reference to FIGS. 2 and 3. The Iq can body 12 is comprised of a layer of structural material 18 18 sandwiched between an outer label 19 and an innex liner 20 1~ which is laminated or bonded to the inside of the structural 20 material 18. It should be understood that a variety of different 21 materials can be utilized to produce the structural material 22 layer 18, the outer label lg, and the inner liner 20. As .. . .
23 examples of suitable such materials, the inner liner 20 may be 2~ formed of a lamination of 01001 in. polypropylene film/0.00035 in 2G aluminum foil/0 0005 in. low-density polyethylene/and 25 lb per 26 ream paper, which may be extensible graae kraft paper or 3/4 mil 27 surlyn/0.00035 "aluminum foil/O.OOos~ low-density polytheylenej 28 25 lb. per ream paper. The structural material layer 18 coula 29 be formed from a number of layers of can stock grade natural 80 kraft. The outer label 19 may be eithex 0.001 high-density ~1 ' ' .
Fo~ 33 - 1138793 I polyethylene~25 lb. per ream natural kraft Eaper or 0.0003 2 aluminum foil/25 lb. per ream natural krat paper. In addition~
8 40-55 lb. per ream coatea bleached paper grades may also be 4 used as label stoc~. The high-density polyethylene, aluminum 6 foil, or coated.bleached paper in these e.~amples for the outer 6 label 19 would serve,as an outer protective coating for the 7 structural material~ Likewise, the inner liner 20 formed of 8 polyp~opylene f~m, aluminum foil, and low-density polyethylene ', 9 is positioned so as to be in contact with the pxoduct being lo contained within the,container 10 and keeps the product out 11 of contact with ,he structural layer 18 . .
12 , An important feature of this invention is the pro-1~ vision of an extended length attaching flange 22 at each end 1~ of the fiber can body 12. Typical flange extension obtained 1~ in conventional flanging methods now being used in the manu-16 facture of composite cans resuIts in a flange length (see "L"
17 in FIG- 2) of .030--050 in- measured from-outer bodywall surface 18 depending on the can size,and the materials used. Flange -19 extension obtained in this invention results in a flange length 20 of ,075-.090 in. It is suggested that the can,body be formed 21 approximately 3/32 of an inch longer than standaxd can bodies 22 currently used for the same size.can to provide additional ..
23 material to form the extended length flanges 22. It is further 2~ suggested that the extended length flanges 22 be formed as 2S shown in FIG 2 so that they are positioned in a generally 26 perpendicular relationship with the can body 12.
27 The metal end closures 14 and 16 are of a standard 28 type used in connection with hermetically sealea cans and may 29 be identical with each other. For the purpose of illustration, 80 FIGS 2 and 3 depict the sequence of uniting the end closure 16 ~2 ~5-1~80~) For~ 233 ( ~3 li 38793 C
1 to the can body 12. It should be understood that the end 2 closure 14 is attached to the opposite end of the can body 8 12 in an identical procedure. The metal end closure 16, as shown in FIGS. 2 and 3, includes a center panel 24, a chuck ~ wall 26, a shoulder area 28, a seaming panel 30, and a cover 6 hook area 32. An important feature of this invention is the' ' provision of a quantity of compounding composition 34 which is 8 strategically positioned across the entire seaming panel 30 g and extend$ partially into the shoulder area 28 and the cover lo hooX area 32~ Such compound normally has been positioned 11 only in the shoulder area of a metal end which is to be double-12 seamed to a composite can body. Thus, as will be seen in 18 re,erence to FIG. 3, the use of the extended flange 22 and the positioning of the compound material 34 results in a ~uch 1~ increased contact area between the metal end and the can body 16 inner liner when they are double-seamed together to form the configuration of FIG 3. Although any suitable compound may be used, a recommended e~ample of a suitable such end lining 19 compound is Compound No. 1105, which is manufactured by the 20 Dewey & Almy Chemical Division o~ W. R. Grace and Company.
21 As can be seen in the transition of FIG. 2 to FIG. 3, when the 22 metal end closure 16 is double-seamed into engagement with the' , . , . ' . ':
23 extended flange 22, a structurally sound joint is formed be-24 tween the metal end closure 16 and the can body 1~., The c,on-26 figuration of this invention results in a relatively lon,g z6 surface area contact between the compouna material 34 and the z7 inner liner 20 on'the can body to thereby form a rather exten-z8 sive bonding area to create an effective hermetic seal between 29 the metal end closure and the can body. Both internal pressure ~ build-up and physical damage to the end chine area tend to sl .
~2 --6--'~O~ ~33 ' ~
.
1 pull the chuck wall area 26 aw~y from the can body, thereby 2 damaging the primar~ seal which is formed in this area. The subject invention avoids this problem b~ relocating the pri-mary seal ta the extende~ flange and curl are,a. These areas 6 tend to be tightened thereby creating an improved primary 6 seal during distortion of the chuck wall area.
7 Thus, the'use of the extended flange 22 and the 8 positioning of the compound 34 creates both an effective her-g metic seal and a structural joint having considerably improved lo strength over previously utilized double-seamed joint For ~1 example, abuse tests comparing the new improved conæiguration 12 Of this invention with a standard double-seamed.joint'have 13 shown that 26.4% of the standard double-seamed joint cans 14 exhibited a loss of hermetic seal due to damage of the end 1~ seam compared with only 2.8~ of the cans featuring the improved 16 extended flange concept of this invention~ ' It should be noted that the metal end closures may.
'18 be heated as taught in my previously mentioned U S. Patent 19 ~~ 3,580,464 so as to aid in the bonding of the compound material 20 with the inner liner on the fiber can body.. However, it has, 21 also been found that the use of the extended flange,and the 22 positioning of the'compound of this invention will provide 23 both a vastly improved hermetic seal and a stronger aouble-', 24 seamed joint even without the specific application of heat 2~ when compared with standard double-seamed joints. Hence, it 26 is clear that the unique structuxe of the subject invention 27 results in a lightweight and inexpensive contai~er which exhibits 28 strength properties heretofore unknown in such containers~ and z~ is capable of both providing an improved hermetic seal for 8~ food products and withstanding the pressures associated with ~1 8~ ' 7 1~800 f`, f Fo~m,333 ~ C~-3 C,~
` "` 1138793 1 pressure-producing products~ such as carbonated beverages 2 and beer. As a result, the desirable use o~ inexpensive, 8 lightweight containers has been extended to additional products beyond those that are currently packaged in such containexs~
'.
g lo 2~
2~
~2
Claims (6)
- Claim 1 continued double-seaming the can end closure and flange together into a seal between the closure and can body such that the flange of the can body extends axially with the inner liner extending along the seaming panel thereby closing the open end of the can, the lining compound forming a primary hermetic annular side seal between said seaming panel of said closure and the inner liner of the flange of said can body, and forming a radially outwardly turned flange having a length of 0.075 inch or greater on the opposite open end of the can body such that the inner layer, structural layer, and outer layer each extend substantially perpendicular to the outer surface of said can body, the other of said pair of can end closures with the compound thereon being adapted for placing it on the flange on said other open end of the can body such that said flange thereon engaging the compound on said shoulder area and said seaming panel and said chuck wall extends axially into the open end of said can body, and adapted for double-seaming the can end closure and said other end flange together into a seal between the closure and can body such that said other flange of the can body extends axially with the inner liner extending along the seaming panel thereby closing the open end of the can, the lining compound forming a primary hermetic annular side seal between said seaming panel of said closure and the inner liner of the flange of said can body.
- 2. The method set forth in claim 1 including the step of double-seaming the can end closure and said other end flange together into a seal between the closure and can body such that said other flange of the can body extends axially with the inner liner extending along the seaming panel thereby closing the open end of the can, the lining compound forming a primary hermetic annular side seal between said seaming panel of said closure and the inner liner of the flange of said can body.
- 3. The method set forth in claims 1 or 2 wherein the steps of forming the radially outwardly turned flanges are such that the flanges have a length of 0.075 - 0.090 inch.
- 4. A composite can construction comprising a cylindrical can body having an inner liner layer, a layer of structural material including plural layers of kraft paper, and an outer label layer, a metal end closure including a center panel, a chuck wall, and a shoulder area, annular seaming panel area and cover hook area, an annular flange at one end of said can body formed radially outwardly and having a length of 0.075 inch or greater from the outer peripheral surface of said can body and disposed such that the inner layer, structural layer and outer layer extend substantially perpendicular with said outer peripheral surface of said body and the thickness of the flange remains substantially the same as that of the thickness of the remainder of the can body except at the area of juncture of said flange and said can body, and a quantity of compound on the underside surface of said metal end closure extending over the entire seaming panel area and onto the shoulder area and cover hook area thereof, said metal end closure being engageable over the annular flange with said compound disposed therebetween for encircling the open end of said can body, said closure being adapted for a mechanical double-seamed connection with said can body flange such that the flange of the can body extends axially with the inner liner extending along the seaming panel forming a primary hermetic annular side seal of the metal end closure and said can body flange in the area of said compound distribution thereby providing an improved seal on such container end and enhancing the strength of the container at said end connection.
- 5. The composite container of claim 4 including a second metal end closure including a center panel, a chuck wall, shoulder area, annular seaming panel area and cover hook area, a quantity of compound on the underside surface of said metal end extending over the entire seaming panel area and onto the shoulder and cover hook areas thereof, an annular flange at the other end of said can body like the opposite end flange and characterized by its outward extent from the outer peripheral surface of said can body being 0.075 inch or greater and such that the inner layer, structural layer and outer layer extend substantially perpendicular with said outer peripheral surface of said body and the thickness of the flange remains substantially the same as that of the thickness of the remainder of the can body except at the area of juncture of said flange and said can body, said second metal end closure being engageable over the annular flange on the other end of the can body with said compound disposed therebetween for encircling the other open end of said can body adapted for a mechanical double-seamed connection with said can body flange at its other end of closing the container.
- 6. The composite can construction set forth in claims 4 or 5 wherein the annular flanges have a length of 0.075-0.090 inch.
1. A method of forming an improved, mechanically strong end closure on a plural ply composite container comprising the steps of providing a cylindrical can body of plural ply composite material open at both its opposite axial ends, said can body comprising an inner layer, a structural layer comprised of plural plies of kraft paper, and an outer layer of label material, said can body having a greater axial length than a standard can body of a given size container, forming a radially outwardly turned flange having a length of 0.075 inch or greater on one open end of said can body such that the inner layer, structural layers, and outer layer each extend substantially perpendicular to the outer surface of said can body, positioning a layer of end lining compound on the undersurface of a pair of metal end closures, each of which includes a chuck wall, adjacent shoulder area, seaming panel and cover hook area, said end lining compound extending over said seaming panel, and at least a portion of said hook area and shoulder area, and placing one of said can end closures with the compound thereon on the flange on one open end of the can body such that said flange engages the compound on said shoulder area and said seaming panel and said chuck wall extends axially into the open end of said can body,
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000343568A CA1138793A (en) | 1980-01-14 | 1980-01-14 | Composite container |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000343568A CA1138793A (en) | 1980-01-14 | 1980-01-14 | Composite container |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1138793A true CA1138793A (en) | 1983-01-04 |
Family
ID=4116029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000343568A Expired CA1138793A (en) | 1980-01-14 | 1980-01-14 | Composite container |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1138793A (en) |
-
1980
- 1980-01-14 CA CA000343568A patent/CA1138793A/en not_active Expired
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4538758A (en) | Composite container | |
| CA2315608C (en) | Easy-open composite container with a membrane-type closure | |
| CA2261247C (en) | Reduced diameter double seam for a composite container | |
| US4626157A (en) | Methods of making containers | |
| US11628969B2 (en) | Container assembly having a heat-sealed metal end, a metal end therefor, and a method for making same | |
| US4533576A (en) | Composite material for packaging containers | |
| US7721578B2 (en) | Opening curled portion of metal can and forming method thereof | |
| US3555976A (en) | Method and apparatus for producing spiral wound container | |
| US3428239A (en) | Spiral wound can for packaging beverages under substantial pressure | |
| EA039845B1 (en) | Pressure-resistant can | |
| EP0364064B1 (en) | Fibre drum with reinforcement collar | |
| GB2067158A (en) | Improved composite container | |
| CA1138793A (en) | Composite container | |
| US5308418A (en) | Packing container for liquid, especially pressurized contents | |
| US20220242610A1 (en) | Laminated Can Sealant | |
| US4163504A (en) | Metal end having fluted end curl | |
| CA1120874A (en) | Composite container | |
| US3734343A (en) | Easy-open composite container | |
| EP0995693B1 (en) | Process for producing a container having a resealable closure and container made by this process | |
| JPS624009A (en) | Method of mounting cover to can drum made of nonmetal | |
| JPH02269642A (en) | Composite can and production thereof | |
| JPS624008A (en) | Method of mounting cover to can drum made of nonmetal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |