CA1077447A - Self-supporting containers - Google Patents
Self-supporting containersInfo
- Publication number
- CA1077447A CA1077447A CA283,516A CA283516A CA1077447A CA 1077447 A CA1077447 A CA 1077447A CA 283516 A CA283516 A CA 283516A CA 1077447 A CA1077447 A CA 1077447A
- Authority
- CA
- Canada
- Prior art keywords
- container
- bag
- adhesive
- laminate
- adhered
- 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
- B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
- B65D31/08—Bags or like containers made of paper and having structural provision for thickness of contents with block bottoms
-
- 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
- B31B2105/00—Rigid or semi-rigid containers made by assembling separate sheets, blanks or 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
- B31B2120/00—Construction of rigid or semi-rigid containers
- B31B2120/40—Construction of rigid or semi-rigid containers lined or internally reinforced
Abstract
ABSTRACT
A stiff-walled carton-like container is formed from a laminate of flexible sheet material, the interply adhesive of which is a settable composition to give the container its stiffness. Before the adhesive sets the laminate is cut and folded into a flat bag, e.g. of the self-opening satchel or block-bottom types. The bag is erected to a carton-like shape and filled after the adhesive sets. The bag can be formed with overlapping bottom flaps peelably adhered together so that the container can be opened from that end by cutting off a corner of one flap, the other end of the container being permanently sealed after filling.
A stiff-walled carton-like container is formed from a laminate of flexible sheet material, the interply adhesive of which is a settable composition to give the container its stiffness. Before the adhesive sets the laminate is cut and folded into a flat bag, e.g. of the self-opening satchel or block-bottom types. The bag is erected to a carton-like shape and filled after the adhesive sets. The bag can be formed with overlapping bottom flaps peelably adhered together so that the container can be opened from that end by cutting off a corner of one flap, the other end of the container being permanently sealed after filling.
Description
~07~7447 This invention relates to self-supporting containers, that is to say containers which maintain their shap~
independently of the contents.
- Boxes and cartons are typical examples of self-supporting containers, whereas bags are generally not self-supporting. The shape of a bag usually varies according to the size, shape and general characteristics of the contents.
Accordingly, goods which are packed in bags are less convenient to handle and store, and frequently do not present such a pleasant external appearance. On the other hand, bags are very easy to make in large numbers, and can be sent out in a -completely flat condition, whereas boxes and cartons generally take longer to make, usually requiring a separate erection operation, and requiring special design features to enable them to be sent out in the flat condition. Moreover, bags can relatively easily be made sift-proof, whereas this is much more difficult for cartons and boxes.
In accordance with one broad aspect, the invention relates to a method of making a self-supporting container which comprises laminating two or more layers of flexible sheet material by means of an intermediate settable adhesive composition, forming the laminate into a collapsed container by a cutting and folding process before the adhesive has set, and then allowing or causing the adhesive to set to form an erectable container with stiff walls.
Preferably, the laminate is made into a collapsed container by a cutting and folding process before the adhesive has set, so that when filled the container will assume a -rectangular configuration, resembling a carton. Suitably, the laminate material is formed into a bag, for example by conventional bag-making procedures, preferably a
independently of the contents.
- Boxes and cartons are typical examples of self-supporting containers, whereas bags are generally not self-supporting. The shape of a bag usually varies according to the size, shape and general characteristics of the contents.
Accordingly, goods which are packed in bags are less convenient to handle and store, and frequently do not present such a pleasant external appearance. On the other hand, bags are very easy to make in large numbers, and can be sent out in a -completely flat condition, whereas boxes and cartons generally take longer to make, usually requiring a separate erection operation, and requiring special design features to enable them to be sent out in the flat condition. Moreover, bags can relatively easily be made sift-proof, whereas this is much more difficult for cartons and boxes.
In accordance with one broad aspect, the invention relates to a method of making a self-supporting container which comprises laminating two or more layers of flexible sheet material by means of an intermediate settable adhesive composition, forming the laminate into a collapsed container by a cutting and folding process before the adhesive has set, and then allowing or causing the adhesive to set to form an erectable container with stiff walls.
Preferably, the laminate is made into a collapsed container by a cutting and folding process before the adhesive has set, so that when filled the container will assume a -rectangular configuration, resembling a carton. Suitably, the laminate material is formed into a bag, for example by conventional bag-making procedures, preferably a
- 2 -~: :
block-bottom or self-opening satchel (S.O.S.) type of bag.
In this latter embodiment, bottom flaps of the bag may be folded over and adhered in an overlapped condition, and are preferably secured in this condition by releasable retaining means, such as a peelable adhesive or a peelable self-adhesive patch so that the container can be opened from that end by cutting off a corner of one flap, the other end of the container being permanently sealed when the contents are enclosed. The other end may be closed by heat sealing together opposed surfaces of the container to form an end fin, and then folding the fin over and sealing it to the ;
rectangular end of the container.
In a second aspect the present invention provides a self-supporting container made by the method of the invention.
The inner layer of the laminate may be made of a barrier material, for example a foil or a plastics film, or be a laminate which includes such a material. Suitably, the ~-~container is made from a laminate o~ two layers of paper, either or both of which may have a barrier layer on its surface remote from the other. The layers may be adhered together by means of a starch based adhesive, which allows the laminate to be cut and creased while the adhesive is still wet, but dries to produce a stiff laminate. The laminating adhesive may itself include a component which imparts barrier properties to the laminate.
In order that the invention may be more clearly understood, one embodiment will now be described with reference to the accompanying drawings, wherein:
Fig. 1 shows a perspective view of an S.O.S. bag in 30 the flat condition before filling, --: ........ . . , . . .- - ..
- , . ~ - .
~077447 Fig. 2 shows a perspective view of the filled and closed bag, and Fig. 3 shows a perspective view of the S.O.S. end of the bag which has been opened for access to the contents.
Referring to the drawings; two webs of paper are laminated by an application of a heavy starch based adhesive, and the laminate is cut and creased in conventional manner to form an S.O.S. bag as shown in Fig. 1. The bag has front and back panels 10, side panels 12 which are pleated at 14, and a -square bottom end 16 in which opposite triangular flaps 18,20 are folded over and secured in an overlap condition by the application of a pressure-sensitive adhesive patch 22. When the starch based a~hesive has set the laminate material is stiff, so that the bag will readily retain a carton-like rectangular appearance when it is opened for filling. - ~-Fig. 2 shows the bag after it has been filled, and the open end closed by sealing together opposed surfaces of the material at the mouth of the bag to form a fin 24. A bag ~ nd 29 closing machine also creases the mouth of the bag at 2~ so that the fin can be fold0d over as indicated by the arrow A
to lie flat against a rectangular end of the bag, and it can be adhered in this position, so that the bag can then be inverted and stood on that end. The S.O.S. end thus becomes the top of the bag and preprinting of the bag material can be arranged accordingly.
When it is desired to open the bag, the patch 22 is peeled away, and the corner of one of the flats 18,20 is cut off, as shown at 28 ~n Fig. 3, so that the contents can be poured out. The bag can then be reclosed by folding the flaps 18,20 back, as shown by the arrows B, and inserting . ~ . . ......................................... ...
-.
.
the apex of the uncut flap into the opening formed by the cut 28 on the other flap.
m e interply adhesive material may include barrier materials to suit the particular commodities or the inner layer of the bag may carry a barrier layer such as a plastics film or a~luminium foil on its inner surface. The adhesive material may be,for example, a thermosetting resin. In such an embodiment, the resin could be cured by heat treatment, or other treatment such as irradiation, during or after filling.
The outer surface of the outer layer of the bag may have a barrier layer to prevent ingress of moisture and other contaminants.
It has been found that filled bags of the present invention retain their rectangular carton-like appearance, and can be stacked several bags high without collapse.
,: . , - - . - , . . . .~ . , . .
: ' . ~ .- '' ~ . . . .
,., . . , .. ~ , ~... ... . . .
block-bottom or self-opening satchel (S.O.S.) type of bag.
In this latter embodiment, bottom flaps of the bag may be folded over and adhered in an overlapped condition, and are preferably secured in this condition by releasable retaining means, such as a peelable adhesive or a peelable self-adhesive patch so that the container can be opened from that end by cutting off a corner of one flap, the other end of the container being permanently sealed when the contents are enclosed. The other end may be closed by heat sealing together opposed surfaces of the container to form an end fin, and then folding the fin over and sealing it to the ;
rectangular end of the container.
In a second aspect the present invention provides a self-supporting container made by the method of the invention.
The inner layer of the laminate may be made of a barrier material, for example a foil or a plastics film, or be a laminate which includes such a material. Suitably, the ~-~container is made from a laminate o~ two layers of paper, either or both of which may have a barrier layer on its surface remote from the other. The layers may be adhered together by means of a starch based adhesive, which allows the laminate to be cut and creased while the adhesive is still wet, but dries to produce a stiff laminate. The laminating adhesive may itself include a component which imparts barrier properties to the laminate.
In order that the invention may be more clearly understood, one embodiment will now be described with reference to the accompanying drawings, wherein:
Fig. 1 shows a perspective view of an S.O.S. bag in 30 the flat condition before filling, --: ........ . . , . . .- - ..
- , . ~ - .
~077447 Fig. 2 shows a perspective view of the filled and closed bag, and Fig. 3 shows a perspective view of the S.O.S. end of the bag which has been opened for access to the contents.
Referring to the drawings; two webs of paper are laminated by an application of a heavy starch based adhesive, and the laminate is cut and creased in conventional manner to form an S.O.S. bag as shown in Fig. 1. The bag has front and back panels 10, side panels 12 which are pleated at 14, and a -square bottom end 16 in which opposite triangular flaps 18,20 are folded over and secured in an overlap condition by the application of a pressure-sensitive adhesive patch 22. When the starch based a~hesive has set the laminate material is stiff, so that the bag will readily retain a carton-like rectangular appearance when it is opened for filling. - ~-Fig. 2 shows the bag after it has been filled, and the open end closed by sealing together opposed surfaces of the material at the mouth of the bag to form a fin 24. A bag ~ nd 29 closing machine also creases the mouth of the bag at 2~ so that the fin can be fold0d over as indicated by the arrow A
to lie flat against a rectangular end of the bag, and it can be adhered in this position, so that the bag can then be inverted and stood on that end. The S.O.S. end thus becomes the top of the bag and preprinting of the bag material can be arranged accordingly.
When it is desired to open the bag, the patch 22 is peeled away, and the corner of one of the flats 18,20 is cut off, as shown at 28 ~n Fig. 3, so that the contents can be poured out. The bag can then be reclosed by folding the flaps 18,20 back, as shown by the arrows B, and inserting . ~ . . ......................................... ...
-.
.
the apex of the uncut flap into the opening formed by the cut 28 on the other flap.
m e interply adhesive material may include barrier materials to suit the particular commodities or the inner layer of the bag may carry a barrier layer such as a plastics film or a~luminium foil on its inner surface. The adhesive material may be,for example, a thermosetting resin. In such an embodiment, the resin could be cured by heat treatment, or other treatment such as irradiation, during or after filling.
The outer surface of the outer layer of the bag may have a barrier layer to prevent ingress of moisture and other contaminants.
It has been found that filled bags of the present invention retain their rectangular carton-like appearance, and can be stacked several bags high without collapse.
,: . , - - . - , . . . .~ . , . .
: ' . ~ .- '' ~ . . . .
,., . . , .. ~ , ~... ... . . .
Claims (14)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method of making a self-supporting container which comprises laminating two or more layers of flexible sheet material by means of an intermediate settable adhesive composition, forming the laminate into a collapsed container by a cutting and folding process before the adhesive has set, and then allowing or causing the adhesive to set to form an erectable container with stiff walls.
2. A method according to claim 1 wherein the container is designed to assume on erection a rectangular configuration, resembling a carton.
3. A method according to claim 2 in which the laminate material is formed into a block-bottom or self-opening satchel type of bag.
4. A method according to claim 2 or claim 3 in which bottom flaps of the bag are folded over and adhered in an overlapping condition to close one end of the bag.
5. A method according to claim 2 or claim 3 in which bottom flaps of the bag are folded over and adhered in an overlapping condition to close one end of the bag, the bottom flaps being releasably secured in said overlapping condition so that the container can be opened from that end by cutting off a corner of one flap, the other end of the container being permanently sealed when the contents are enclosed.
6. A method according to claim 2 or claim 3 in which bottom flaps of the bag are folded over and adhered in an overlapping condition to close one end of the bag, the bottom flaps being releasably secured in said overlapping condition by a peelable adhesive or a peelable adhesive patch, so that the container can be opened from that end by cutting off a corner of one flap, the other end of the container being permanently sealed when the contents are enclosed.
7. A method according to claim 2 or claim 3 in which bottom flaps of the bag are folded over and adhered in an overlapping condition to close one end of the bag, the other end of the bag being closed when the contents are enclosed by heat sealing together opposed precreased and folded surfaces of the container to form an end fin, and then folding the fin over and sealing it to the rectangular end of the container.
8. A method according to claim 1 or claim 2 in which the layers are adhered together by a starch based adhesive which allows the laminate to be cut and creased while the adhesive is still wet, but dries to produce a stiff laminate.
9. A method according to claim 1 or claim 2 in which the laminating adhesive includes a component which imparts barrier properties to the laminate.
10. A method according to claim 1 or claim 2 in which the layers are adhered together by a thermosetting resin.
11. A method according to claim 1 or claim 2 wherein the inner layer of the laminate is made of or includes a barrier material.
12. A method according to claim 1 or claim 2 wherein the inner layer is or includes a metal foil or plastics film.
13. A method according to claim 1 or claim 2 wherein the laminate comprises two layers of paper, either or both of which has a barrier layer on its surface remote from the other.
14. A self-supporting container, comprising two or more layers of flexible sheet material laminated together by means of an intermediate settable adhesive composition, the laminate having been formed into a collapsed container by a cutting and folding process before the adhesive has set, and the adhesive allowed or caused to set to form an erectable container with stiff walls.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB31304/76A GB1585459A (en) | 1976-07-27 | 1976-07-27 | Self-supporting containers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1077447A true CA1077447A (en) | 1980-05-13 |
Family
ID=10321139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA283,516A Expired CA1077447A (en) | 1976-07-27 | 1977-07-26 | Self-supporting containers |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1077447A (en) |
| GB (1) | GB1585459A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2281553A (en) * | 1993-09-01 | 1995-03-08 | Alan Breadon | Holding open the mouth of a fold-flat container |
-
1976
- 1976-07-27 GB GB31304/76A patent/GB1585459A/en not_active Expired
-
1977
- 1977-07-26 CA CA283,516A patent/CA1077447A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB1585459A (en) | 1981-03-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |