CA1126701A - Packages and method of making them - Google Patents
Packages and method of making themInfo
- Publication number
- CA1126701A CA1126701A CA387,381A CA387381A CA1126701A CA 1126701 A CA1126701 A CA 1126701A CA 387381 A CA387381 A CA 387381A CA 1126701 A CA1126701 A CA 1126701A
- Authority
- CA
- Canada
- Prior art keywords
- bags
- central portion
- pockets
- end portions
- bag construction
- 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
Classifications
-
- 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
- B65D33/00—Details of, or accessories for, sacks or bags
- B65D33/001—Blocks, stacks or like assemblies of bags
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2155/00—Flexible containers made from webs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2155/00—Flexible containers made from webs
- B31B2155/003—Flexible containers made from webs starting from tubular webs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2160/00—Shape of flexible containers
- B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B70/00—Making flexible containers, e.g. envelopes or bags
- B31B70/14—Cutting, e.g. perforating, punching, slitting or trimming
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B70/00—Making flexible containers, e.g. envelopes or bags
- B31B70/14—Cutting, e.g. perforating, punching, slitting or trimming
- B31B70/16—Cutting webs
- B31B70/18—Cutting webs longitudinally
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B70/00—Making flexible containers, e.g. envelopes or bags
- B31B70/74—Auxiliary operations
- B31B70/92—Delivering
- B31B70/98—Delivering in stacks or bundles
- B31B70/984—Stacking bags on wicket pins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B70/00—Making flexible containers, e.g. envelopes or bags
- B31B70/74—Auxiliary operations
- B31B70/92—Delivering
- B31B70/98—Delivering in stacks or bundles
- B31B70/988—Assembling or block-forming of bags; Loading bags on a mandrel
Abstract
ABSTRACT OF THE DISCLOSURE
A method of manufacturing bags, and the bags manufactured by the method. The method comprises the steps of forming a web of thermoplastic material in the form of a tube, having a central portion and two ends doubled back over the central portion at a pair of fold lines. Terminal portions of the ends are folded back over the ends toward the first fold lines at a pair second fold lines, and a tear line is formed adjacent each second fold line.
The web is heat sealed and severed transversely to define first pockets between the central portion and the ends, and second pockets between the ends and the terminal portions to define oppositely facing pairs of bags. The bags thus formed are stacked and heat sealed together.
A method of manufacturing bags, and the bags manufactured by the method. The method comprises the steps of forming a web of thermoplastic material in the form of a tube, having a central portion and two ends doubled back over the central portion at a pair of fold lines. Terminal portions of the ends are folded back over the ends toward the first fold lines at a pair second fold lines, and a tear line is formed adjacent each second fold line.
The web is heat sealed and severed transversely to define first pockets between the central portion and the ends, and second pockets between the ends and the terminal portions to define oppositely facing pairs of bags. The bags thus formed are stacked and heat sealed together.
Description
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This invention relates to a method of manufacturing bags, and to the bags manufactured by the method.
Bags of thc general type disclosed herein are taught, for example, in United States Patent No. 2,628,013, granted on February 10, 1953 to C. W. Vogt.
Other relevant prior art includes British Patent No. 1,131,063, published on October 23, 1968 in the name of Windmoller and Holscher and United States PatentNo. 3,548,723, granted on December 22, 1370 to Sengewald.
In the Vogt United States patent, there is taught the manufacture of paired bags that hang from a central support in such a manner that they may be easily filled, and then separated and closed. Specifically, referring to column 1 of United States Patent No. 2,628,013, it is disclosed that an important feature of the Vogt invention is that two bags are connected at their open ends ; and in such a way that they may be hung on opposite sides of a support with the connecting portion resting on the support.
Also known in the art are so-called "deli-bags" which, in the manner taught in British Patent No. 1,131,063, hang from a support in such a manner that individual bags can be easily filled with foodstuffs and the like and then removed from the stand and closed. Such bags are normally open-mouth bags, and have to be closed by means of a twist-tie or similiar closure dcvice. Such bags have been used extensively in food packaging operations, such as in take-out restuarants where they are particularly convenient for wrapping sandwiches.
Further known in the art are small plastic bags having a closure top comprising a pocket adjacent the mouth of the bag and facing in a direction opposite to the mouth of the bag. To close such bags, it is necessary only to fold the pocket over the mouth of the bag.
~hile deli-bags have been known for many years, and bags with the locking top as described above have also been known for many years, to my ~L~267V~
knowledge no one has devised a product capable of use in a foodstore for packag-ing foodstuffs, that can easily be torn from a support, and cheaply and quickly manufactured while providing the locking top feature and thus eliminating the need for a separate tie. The present i-nvention aims to provide such a bag, using a minimum of materials and using conventional manufacturing techniques.
The invention accordingly provides a method of manufacturing bags comprising the steps of;
~ i) forming a web of thin~ flexible thermoplastic material substan-tially in the form of a tube, having a central portion and two ends doubled back over the central portion at a pair of first fold lines;
~ii) folding terminal portions of said ends back ober said ends towards the first fold lines at a pair of second fold lines;
(iii) forming a tear line adjacent each second fold line;
~iv) heat sealing and severing the web transversely to define first pockets between the central portion and ~he ends, and second pockets between the ends and the terminal portions to define oppositely facing pairs of bags;
~v) stacking the pairs of bags thus defined; and ~vi) heat sealing the stacks of bags together centrally of the central portion.
The invention also provides a bag construction comprising a plurality of webs of thermoplastic film having two ends, each of said two ends being doubled back at a fold line over a central : portion of each web to form two first pockets having oppositely facing and spaced ` apart mouths, terminal portions of said two ends being folded outwardly towards said fold lines to form second pockets facing outwardly and oppositely away from each other,
This invention relates to a method of manufacturing bags, and to the bags manufactured by the method.
Bags of thc general type disclosed herein are taught, for example, in United States Patent No. 2,628,013, granted on February 10, 1953 to C. W. Vogt.
Other relevant prior art includes British Patent No. 1,131,063, published on October 23, 1968 in the name of Windmoller and Holscher and United States PatentNo. 3,548,723, granted on December 22, 1370 to Sengewald.
In the Vogt United States patent, there is taught the manufacture of paired bags that hang from a central support in such a manner that they may be easily filled, and then separated and closed. Specifically, referring to column 1 of United States Patent No. 2,628,013, it is disclosed that an important feature of the Vogt invention is that two bags are connected at their open ends ; and in such a way that they may be hung on opposite sides of a support with the connecting portion resting on the support.
Also known in the art are so-called "deli-bags" which, in the manner taught in British Patent No. 1,131,063, hang from a support in such a manner that individual bags can be easily filled with foodstuffs and the like and then removed from the stand and closed. Such bags are normally open-mouth bags, and have to be closed by means of a twist-tie or similiar closure dcvice. Such bags have been used extensively in food packaging operations, such as in take-out restuarants where they are particularly convenient for wrapping sandwiches.
Further known in the art are small plastic bags having a closure top comprising a pocket adjacent the mouth of the bag and facing in a direction opposite to the mouth of the bag. To close such bags, it is necessary only to fold the pocket over the mouth of the bag.
~hile deli-bags have been known for many years, and bags with the locking top as described above have also been known for many years, to my ~L~267V~
knowledge no one has devised a product capable of use in a foodstore for packag-ing foodstuffs, that can easily be torn from a support, and cheaply and quickly manufactured while providing the locking top feature and thus eliminating the need for a separate tie. The present i-nvention aims to provide such a bag, using a minimum of materials and using conventional manufacturing techniques.
The invention accordingly provides a method of manufacturing bags comprising the steps of;
~ i) forming a web of thin~ flexible thermoplastic material substan-tially in the form of a tube, having a central portion and two ends doubled back over the central portion at a pair of first fold lines;
~ii) folding terminal portions of said ends back ober said ends towards the first fold lines at a pair of second fold lines;
(iii) forming a tear line adjacent each second fold line;
~iv) heat sealing and severing the web transversely to define first pockets between the central portion and ~he ends, and second pockets between the ends and the terminal portions to define oppositely facing pairs of bags;
~v) stacking the pairs of bags thus defined; and ~vi) heat sealing the stacks of bags together centrally of the central portion.
The invention also provides a bag construction comprising a plurality of webs of thermoplastic film having two ends, each of said two ends being doubled back at a fold line over a central : portion of each web to form two first pockets having oppositely facing and spaced ` apart mouths, terminal portions of said two ends being folded outwardly towards said fold lines to form second pockets facing outwardly and oppositely away from each other,
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said two first pockets defining with the second pockets a pair of separate bags, spaced from each other by a portion of the central portion of the web, spaced transverse lines of weakness formed in said portion of the cen-tral portion of the web, and means for mounting a plurality of webs with the said portion of the central portion of each web on a suitable stand whereby, when mounted on said stand, the individual bags may be removed from the bag construction by tearing along the line of weakness and the second pockets folded over the mouths of the first pockets to enclose articles within the bags.
Specific embodiments of the invention are shown in the accompanying drawings, in which:
Figure 1 is an illustration of the step of manufacturing an extruded plastic tube for use in manufacturing bags according to the invention;
Figure 2 illustrates the simultaneous production of tubes of the type shown in Figure 1, but of differing dimensions;
Figure 3 illustrates, serially, the steps of manufacture of bags according to the invention;
~ Figure 4 illustrates in a manner similiar to Figure 3 how bags of - 20 differing dimensions can be manufactured from a single tube;
Figure 5 illustrates the manner in which a stack of bags may be formed with posting apparatus;
Figure 5a is a section on the lines Sa-5a of Figure 5;
Figure 6 illustrates a stack of bags, as formed in the step of Figure 5, on a suitable stand;
Figure 7 illustrates a completed bag before closure;
Figure 7a is a section on the line 7b-7b of Figure 7;
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67~1 Figure 8 is an illustration of a closed bag, and;
Figure 8a is a section on the line 8c-8c of Figure 8 showing a bag in its closed condition.
A prefe~red method of manufacture of bags according to the invention is from extruded plastic tube. ~owever, it is possible, by suitable folding, to form the bags from a weh. For convenience of description, the bags are described as manufactured from extruded thermoplastic tuhing, which may be either plain or embossed.
Normally, such tubing is formed from polymeric materials, including, polyethylene and like n)aterials. Such materials are easily handled in bag making machinery in that they are easily folded and heat sealed.
In Figure 1, an extruder 11 is used to extrude a continuous tube 10.
In Figure 2, there are illustrated four different sizes of extruders lla, llb, llc and lld which produce bags of differing widths 10a, 10b, 10c and 10d. It will be evident that one can manufacture several different sizes of bag simul-taneously, thus speeding production.
Illustrated in Figure 3 are the sequential steps in a desirable me~hod of manufacture. One side of the tube is first slit by a suitable knie 13, which in known manner is supported from above and i5 provided with a plate 14 to ensure that only one side of the bag is slit. Downstream of the knife 13 is a spreader-folder 15, also of known type, for folding the web to both sides of the slit at 16 and 16a. Downstream again from the spreader-folder 15 is a serrating tool 17, which forms a score or tear line on both sides of the central portion of ~- the web at 27 and 28, adjacent the fold formed by portions 16 and 16a. A
punch or punches 18 may be provided to perforate the central portion of the web at suitable intervals, for purposes to be described below. Finally, knife and sealer 19 is provided; this is of known type and is heated to a temperature ~; suitable for both heat sealing and cutting the web, transversely, to separate : .- : : -, . ~ - : , . : . ,. .. , : :
~Z~7~1 discrete portions 20.
Referring specifically to the individual, cut-off portions 20, it will be noted that they comprise two separate bags 21 and 22, heat sealed along their edges 23 and 24, to form two open mouthed bags with outwardly facing pockets 25 and 26 respectively. A central perforated web portion may be separated from the bags by tearing along the lines 27 and 28 in a manner to be described below.
The steps illustrated in Figure 4 are identical to those illustrated in Figure 3, with the exception that for special situations where two sizes of bag are required, the cutting, spreading and folding, serrating, and punching operations are of~-set from the center of the tubular web. For small articles, one bag of the pair can be used, and for larger articles the other bag of the pair can be used.
After the bags are produced by the steps shown in Figure 3, they are stacked, in an orderly fashion, to form a block 29 ~Figure 5). After a suitable, predetermined number of bags have been formed into the block, they may be posted by a heat tool 30 which forms holes in the central portion. These holes, as illustrated in Figure 6, are dimensioned and located so that they can be used in cooperation with a stand 32 having a transverse bar 33 and vertically ex-tending posts 34 that mate with the holes 31. The stand may be dimensioned so ; 20 that it is free-standing, to rest on the floor or on a table at a work station, or in the manner illustrated in British Patent No. 1,131,063 attached to a wall.
` The tool 30,~in posting~ would heat seal the block of bags 29 together to form an easily handled unit.
~:
~ As also illustrated in Figure 6, an individual bag may first have .
` articles placed in it through the open mouth. The bag may then be torn off ~; ~ from the block along the respective score line; Figure 6 illustrates a partial :~ tear 35 of a fillecl bag. After the bag is removed from the block 29 of Figure ,~' ';
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6, the pocket may be folded over the open mouth of the bag to form a closed bag as shown in Figures 8 and 8a.
It will be appreciated from the above that several advantages flow from the present invention. First, compared with known techniques for the manu-facture of these bags, there is less waste material in that the plastic material that would normally be of double thickness in the center of the block and there-fore wasted is folded back, and used to Eorm the pocket for the locking top of the bag. The thickness of the central portion of the block of bags is substan-tially reduced by virtue of the presence of only a single layer of plastic material, as compared with the prior art of conventional type where a double layer of plastic material would remain in the middle. The advantages of the locking top type bag for use in a variety of environments will be self evident.
The person packaging foodstuffs or the like does not have to maintain a separate supply of closures or clips for closing filled bags, and relies instead on the locking top feature. Once the apparatus for carrying out the method described in this application is set up, the additional cost of manufacture is no more expensive than the manufacture of the less advantageous bags of the prior art.
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said two first pockets defining with the second pockets a pair of separate bags, spaced from each other by a portion of the central portion of the web, spaced transverse lines of weakness formed in said portion of the cen-tral portion of the web, and means for mounting a plurality of webs with the said portion of the central portion of each web on a suitable stand whereby, when mounted on said stand, the individual bags may be removed from the bag construction by tearing along the line of weakness and the second pockets folded over the mouths of the first pockets to enclose articles within the bags.
Specific embodiments of the invention are shown in the accompanying drawings, in which:
Figure 1 is an illustration of the step of manufacturing an extruded plastic tube for use in manufacturing bags according to the invention;
Figure 2 illustrates the simultaneous production of tubes of the type shown in Figure 1, but of differing dimensions;
Figure 3 illustrates, serially, the steps of manufacture of bags according to the invention;
~ Figure 4 illustrates in a manner similiar to Figure 3 how bags of - 20 differing dimensions can be manufactured from a single tube;
Figure 5 illustrates the manner in which a stack of bags may be formed with posting apparatus;
Figure 5a is a section on the lines Sa-5a of Figure 5;
Figure 6 illustrates a stack of bags, as formed in the step of Figure 5, on a suitable stand;
Figure 7 illustrates a completed bag before closure;
Figure 7a is a section on the line 7b-7b of Figure 7;
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67~1 Figure 8 is an illustration of a closed bag, and;
Figure 8a is a section on the line 8c-8c of Figure 8 showing a bag in its closed condition.
A prefe~red method of manufacture of bags according to the invention is from extruded plastic tube. ~owever, it is possible, by suitable folding, to form the bags from a weh. For convenience of description, the bags are described as manufactured from extruded thermoplastic tuhing, which may be either plain or embossed.
Normally, such tubing is formed from polymeric materials, including, polyethylene and like n)aterials. Such materials are easily handled in bag making machinery in that they are easily folded and heat sealed.
In Figure 1, an extruder 11 is used to extrude a continuous tube 10.
In Figure 2, there are illustrated four different sizes of extruders lla, llb, llc and lld which produce bags of differing widths 10a, 10b, 10c and 10d. It will be evident that one can manufacture several different sizes of bag simul-taneously, thus speeding production.
Illustrated in Figure 3 are the sequential steps in a desirable me~hod of manufacture. One side of the tube is first slit by a suitable knie 13, which in known manner is supported from above and i5 provided with a plate 14 to ensure that only one side of the bag is slit. Downstream of the knife 13 is a spreader-folder 15, also of known type, for folding the web to both sides of the slit at 16 and 16a. Downstream again from the spreader-folder 15 is a serrating tool 17, which forms a score or tear line on both sides of the central portion of ~- the web at 27 and 28, adjacent the fold formed by portions 16 and 16a. A
punch or punches 18 may be provided to perforate the central portion of the web at suitable intervals, for purposes to be described below. Finally, knife and sealer 19 is provided; this is of known type and is heated to a temperature ~; suitable for both heat sealing and cutting the web, transversely, to separate : .- : : -, . ~ - : , . : . ,. .. , : :
~Z~7~1 discrete portions 20.
Referring specifically to the individual, cut-off portions 20, it will be noted that they comprise two separate bags 21 and 22, heat sealed along their edges 23 and 24, to form two open mouthed bags with outwardly facing pockets 25 and 26 respectively. A central perforated web portion may be separated from the bags by tearing along the lines 27 and 28 in a manner to be described below.
The steps illustrated in Figure 4 are identical to those illustrated in Figure 3, with the exception that for special situations where two sizes of bag are required, the cutting, spreading and folding, serrating, and punching operations are of~-set from the center of the tubular web. For small articles, one bag of the pair can be used, and for larger articles the other bag of the pair can be used.
After the bags are produced by the steps shown in Figure 3, they are stacked, in an orderly fashion, to form a block 29 ~Figure 5). After a suitable, predetermined number of bags have been formed into the block, they may be posted by a heat tool 30 which forms holes in the central portion. These holes, as illustrated in Figure 6, are dimensioned and located so that they can be used in cooperation with a stand 32 having a transverse bar 33 and vertically ex-tending posts 34 that mate with the holes 31. The stand may be dimensioned so ; 20 that it is free-standing, to rest on the floor or on a table at a work station, or in the manner illustrated in British Patent No. 1,131,063 attached to a wall.
` The tool 30,~in posting~ would heat seal the block of bags 29 together to form an easily handled unit.
~:
~ As also illustrated in Figure 6, an individual bag may first have .
` articles placed in it through the open mouth. The bag may then be torn off ~; ~ from the block along the respective score line; Figure 6 illustrates a partial :~ tear 35 of a fillecl bag. After the bag is removed from the block 29 of Figure ,~' ';
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6, the pocket may be folded over the open mouth of the bag to form a closed bag as shown in Figures 8 and 8a.
It will be appreciated from the above that several advantages flow from the present invention. First, compared with known techniques for the manu-facture of these bags, there is less waste material in that the plastic material that would normally be of double thickness in the center of the block and there-fore wasted is folded back, and used to Eorm the pocket for the locking top of the bag. The thickness of the central portion of the block of bags is substan-tially reduced by virtue of the presence of only a single layer of plastic material, as compared with the prior art of conventional type where a double layer of plastic material would remain in the middle. The advantages of the locking top type bag for use in a variety of environments will be self evident.
The person packaging foodstuffs or the like does not have to maintain a separate supply of closures or clips for closing filled bags, and relies instead on the locking top feature. Once the apparatus for carrying out the method described in this application is set up, the additional cost of manufacture is no more expensive than the manufacture of the less advantageous bags of the prior art.
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Claims (9)
1. A method of manufacturing bags comprising the steps of;
(i) forming a continuous web of thin, flexible thermo-plastic material to have a central portion and two end portions each of which is doubled back over part of the central portion at a first fold line, so that terminal portions of said doubled back end portions are in close proximity, (ii) folding the terminal portions of said end portions back over part of said end portions towards the first fold lines at a pair of second fold lines;
(iii) forming a tear line inwardly of and substantially adjacent to each second fold line;
(iv) heat sealing and severing the folded material trans-versely to define first pockets between the central portion and the end portions and second pockets between the end portions and the terminal portions thus defining pairs of oppositely facing bags;
(v) stacking the pairs of bags; and (vi) heat sealing the stacks of pairs of bags together centrally of the central portion.
(i) forming a continuous web of thin, flexible thermo-plastic material to have a central portion and two end portions each of which is doubled back over part of the central portion at a first fold line, so that terminal portions of said doubled back end portions are in close proximity, (ii) folding the terminal portions of said end portions back over part of said end portions towards the first fold lines at a pair of second fold lines;
(iii) forming a tear line inwardly of and substantially adjacent to each second fold line;
(iv) heat sealing and severing the folded material trans-versely to define first pockets between the central portion and the end portions and second pockets between the end portions and the terminal portions thus defining pairs of oppositely facing bags;
(v) stacking the pairs of bags; and (vi) heat sealing the stacks of pairs of bags together centrally of the central portion.
2. The method claimed in claim 1 in which the steps are carried out in the order recited in claim 1.
3. The method defined in claim 1 in which the formed web re-cited in step (i) is obtained by forming a tube of thin flex-ible thermoplastic material, and slitting the tube in longitu-dinal direction prior to folding back of the two terminal portions.
4. The method defined in claim 1 or 3 wherein the heat seal-ing step (vi) simultaneously forms perforations centrally of the central portion for mating with posts on a suitable stand.
5. A bag construction comprising:
(i) a plurality of units of thermoplastic film material;
(ii) each unit having a central portion and two end por-tions each of which is doubled back at a fold line over part of the central portion to form two first pockets having oppositely facing and spaced apart mouths;
(iii) terminal portions of said two end portions being folded outwardly over part of said end portions towards said fold lines to form second pockets facing outwardly and oppositely away from each other;
(iv) said two first pockets defining with the second pockets a pair of separate bags, spaced from each other by a portion of the central portion of the unit;
(v) spaced transverse lines of weakness formed in said portion of the central portion of the unit; and (vi) means for mounting a plurality of units comprising pairs of bags with said portion of the central portion of each unit on a suitable stand; whereby, when mounted on said stand, individual bags may be removed from the bag construction by tearing along the line of weakness and the second pockets may be folded over the mouths of the first pockets to enclose articles within the bags.
(i) a plurality of units of thermoplastic film material;
(ii) each unit having a central portion and two end por-tions each of which is doubled back at a fold line over part of the central portion to form two first pockets having oppositely facing and spaced apart mouths;
(iii) terminal portions of said two end portions being folded outwardly over part of said end portions towards said fold lines to form second pockets facing outwardly and oppositely away from each other;
(iv) said two first pockets defining with the second pockets a pair of separate bags, spaced from each other by a portion of the central portion of the unit;
(v) spaced transverse lines of weakness formed in said portion of the central portion of the unit; and (vi) means for mounting a plurality of units comprising pairs of bags with said portion of the central portion of each unit on a suitable stand; whereby, when mounted on said stand, individual bags may be removed from the bag construction by tearing along the line of weakness and the second pockets may be folded over the mouths of the first pockets to enclose articles within the bags.
6. The bag construction defined in claim 5 wherein the means of subparagraph (vi) comprise perforations that mate with posts on the stand.
7. The bag construction defined in claim 5 wherein the thermo-plastic material is plain.
8. The bag construction defined in claim 5 wherein the thermo-plastic material is embossed.
9. The bag construction defined in claim 6 wherein the per-forations are formed by heating means that fuse the plurality of units together adjacent the perforations.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA387,381A CA1126701A (en) | 1981-10-06 | 1981-10-06 | Packages and method of making them |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA387,381A CA1126701A (en) | 1981-10-06 | 1981-10-06 | Packages and method of making them |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1126701A true CA1126701A (en) | 1982-06-29 |
Family
ID=4121104
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA387,381A Expired CA1126701A (en) | 1981-10-06 | 1981-10-06 | Packages and method of making them |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1126701A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0449497A1 (en) * | 1990-03-26 | 1991-10-02 | Automated Packaging Systems, Inc. | Process for forming chain of interconnected plastic bags |
| US5562213A (en) * | 1994-08-11 | 1996-10-08 | Bpi Packaging Technologies, Inc. | Bag dispensing system and rack |
| WO2006128835A3 (en) * | 2005-05-30 | 2007-02-01 | Arcadia Srl | Method to make a package for foodstuffs and package thus obtained |
-
1981
- 1981-10-06 CA CA387,381A patent/CA1126701A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0449497A1 (en) * | 1990-03-26 | 1991-10-02 | Automated Packaging Systems, Inc. | Process for forming chain of interconnected plastic bags |
| US5562213A (en) * | 1994-08-11 | 1996-10-08 | Bpi Packaging Technologies, Inc. | Bag dispensing system and rack |
| WO2006128835A3 (en) * | 2005-05-30 | 2007-02-01 | Arcadia Srl | Method to make a package for foodstuffs and package thus obtained |
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