GB1604830A - Laminate for packaging flour - Google Patents
Laminate for packaging flour Download PDFInfo
- Publication number
- GB1604830A GB1604830A GB37222/77A GB3722277A GB1604830A GB 1604830 A GB1604830 A GB 1604830A GB 37222/77 A GB37222/77 A GB 37222/77A GB 3722277 A GB3722277 A GB 3722277A GB 1604830 A GB1604830 A GB 1604830A
- Authority
- GB
- United Kingdom
- Prior art keywords
- film
- paper
- adhesive
- web
- flour
- 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
- 235000013312 flour Nutrition 0.000 title claims description 29
- 238000004806 packaging method and process Methods 0.000 title claims description 14
- 238000000034 method Methods 0.000 claims description 26
- 239000000853 adhesive Substances 0.000 claims description 21
- 230000001070 adhesive effect Effects 0.000 claims description 21
- 229920003023 plastic Polymers 0.000 claims description 12
- 239000004033 plastic Substances 0.000 claims description 12
- 238000009826 distribution Methods 0.000 claims description 11
- 229920000573 polyethylene Polymers 0.000 claims description 9
- 239000004698 Polyethylene Substances 0.000 claims description 8
- -1 polyethylene Polymers 0.000 claims description 8
- 229920001577 copolymer Polymers 0.000 claims description 7
- 238000003475 lamination Methods 0.000 claims description 7
- 125000002947 alkylene group Chemical group 0.000 claims description 6
- 238000012856 packing Methods 0.000 claims description 6
- 229920000642 polymer Polymers 0.000 claims description 6
- 229920002635 polyurethane Polymers 0.000 claims description 6
- 239000004814 polyurethane Substances 0.000 claims description 6
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 claims description 4
- 229920006332 epoxy adhesive Polymers 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 229920001169 thermoplastic Polymers 0.000 claims description 4
- 239000004416 thermosoftening plastic Substances 0.000 claims description 4
- 238000011065 in-situ storage Methods 0.000 claims description 3
- 229920000298 Cellophane Polymers 0.000 claims description 2
- 239000004593 Epoxy Substances 0.000 claims description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 claims description 2
- 229920000459 Nitrile rubber Polymers 0.000 claims description 2
- 240000007594 Oryza sativa Species 0.000 claims description 2
- 235000007164 Oryza sativa Nutrition 0.000 claims description 2
- 240000004713 Pisum sativum Species 0.000 claims description 2
- 235000010582 Pisum sativum Nutrition 0.000 claims description 2
- 229920006243 acrylic copolymer Polymers 0.000 claims description 2
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 claims description 2
- 238000004026 adhesive bonding Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 239000003960 organic solvent Substances 0.000 claims description 2
- 239000011236 particulate material Substances 0.000 claims description 2
- 229920002239 polyacrylonitrile Polymers 0.000 claims description 2
- 229920001281 polyalkylene Polymers 0.000 claims description 2
- 229920001195 polyisoprene Polymers 0.000 claims description 2
- 239000000047 product Substances 0.000 claims description 2
- 235000009566 rice Nutrition 0.000 claims description 2
- 229920003051 synthetic elastomer Polymers 0.000 claims description 2
- 239000005061 synthetic rubber Substances 0.000 claims description 2
- 229920006163 vinyl copolymer Polymers 0.000 claims description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 2
- 239000000123 paper Substances 0.000 description 24
- 239000000463 material Substances 0.000 description 6
- 229920000742 Cotton Polymers 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 235000011868 grain product Nutrition 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 239000011101 paper laminate Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/10—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/31—Heat sealable
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2310/00—Treatment by energy or chemical effects
- B32B2310/14—Corona, ionisation, electrical discharge, plasma treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2317/00—Animal or vegetable based
- B32B2317/12—Paper, e.g. cardboard
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2323/00—Polyalkenes
- B32B2323/04—Polyethylene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2331/00—Polyvinylesters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2439/00—Containers; Receptacles
- B32B2439/40—Closed containers
- B32B2439/46—Bags
Landscapes
- Wrappers (AREA)
Description
(54) LAMINATE FOR PACKAGING FLOUR
(71) We, FIRBRET ENGINEERING LIMI
TED, a British Company of Moss Road,
Witham, Essex CM8 3UG, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particu larly described in and by the following statement: This invention relates to a method of packaging flour mainly for domestic use and to a material for use therein.
The packaging of flour presents certain problems. The material is a finely divided
powder which must be kept from leaking out, thus necessitating a packaging material which does not have significant pores. The material must be kept dry to. prevent spoilage, and, most important, it must be allowed
to "breathe". Flour and other like milled grain products cannot be sealed in a totally impervious material, or in a materal of very restricted permeability, since this would lead to accelerated deterioration. In general a shelf life of about six months is desirable.
An added problem is that flour is one of the food products which is traditional and on which the buying public have very conservative views.
Traditionally, flour has always been packed in either finely woven cotton bags treated with a sizing material to prevent sepage (the traditional flour bag) or, in more recent years, stout paper bags. The cotton bags have now been superceded more or less completely. since they do not lend themselves to modern automatic filling techniques, and are very expensive. Stout paper, on the other hand, as used more or less ex elusively thoughout the flour packaging industry today, requires complicated machinery which takes up a lot of space in the packing station and requires a high capital outlay (of the order of 300,000). Attempts to sell flour in modern plastics film packs have been totally unsuccessful, since the consumer rejects such packs.
We have now found that if a heat-sealable, but permeable film is laminated to thin paper (i.e. paper of a significantly smaller gauge than that used for conventional flour bags) this material can be used to produce packages which closely resemble traditional flour bags, but which can be produced on small modern machines of the "form, fill and seal" type. However, not any paper laminate can be used and we have found that a particular combination of paper and plastics film is necessary for success.
According to the present invention there is provided a method of packing flour and the like, in which a twoply web of paper and plastics film is used to form bags on an automatic packaging machine of the "form, fill and seal" type, the web comprising a layer of paper of 30 to 50 gsm (g/m2) adhesive-bonded to a perforated film of an alkylene polymer or copolymer, the film being of 25 to 50 microns thickness and having a perforation size of 0.5 to 2 mm diameter and a perforation distribution of 5,000 to 20,000 perforations/m2, whereby packs are produced having a paper exterior resembling a traditional stout paper flour bag.
According to a further feature of this invention we provide a pack of flour or the like comprising a two-ply bag formed from a two-ply web as defined above in situ and heat-sealed, the paper layer being on the outside of the bag.
According to this invention we also provide a two-ply web comprising a layer of paper of 30 to 50 gsm adhesive bonded to a perforated film of an alkylene polymer or copolymer, the film being of 25 to 50 mic rons thickness and having a perforation size of 0.5 to 2 mm diameter and a perforation distribution of 5,000 to 20.000 poreslm2.
The plastics film used in this invention is an alkylene polymer or copolymer film, and is preferably based on ethylene polymers, in particular a polyeth lene/EVA copolymer. An example of a film of a plastics maS terial of this type is the type known as 70 produced by British Cellophane Limited.
As stated, the thickness of the film should be from 25 to 50 microns and a thickness of about 38 microns is preferred. The film must be perforated. The preferred size of perforation is about lmm diameter at a distribution of about 10,000 perforationlm2, preferably in a square array. It is also preferred that one surface of the film is treated with a corona discharge in order to facilitate adhesive bonding.
The paper to which the above film is laminated may be any suitable packaging paper of the required strength, but is is essential that its thickness is such that its weight does not exceed 50 gsm. Higher weight papers cause problems with heat sealing, leading to weak packages. The paper may be printed before or after lamination, using any convenient printing technique.
The adhesive used for the lamination may be any adhesives suitable for bonding a polyalkylene film to paper. Some preferred adhesives are:
1. a single component polyurethane ad
hesive, supplied solventless or in an
organic solvent;
2. a two component polyurethane ad
hesive;
3. an epoxy adhesive, for example an
epoxyamme. epoxyamide or epoxy
uretane; or
4. a single component thermoplastic and/
or curing adhesive in water-borne
form, for example a vinyl or acrylic
copolymer polyisoprene, synthetic rub
ber, synthetic butadiene, or polyacrylo
nitrile, or ABS.
Adhesives 1 or 2 or preferred.
The "form, fill and seal" machinery which can be used with the laminated film according to the present invention may comprise any suitable machine which is commercially available for use with heat-sealable plastics films. A typical example is the L2CS Form
Fill Seal Machine sold under the Trade
Name Maidstone Triangle, distributed by
Maidstone Packaging Equipment Limited of Whitstable, Kent. Such machines are commonly used for the packaging of confectionary or particulate materials such- as whole rice or dried peas. Such machines are compact and are very much cheaper than the elaborate machinery required for the pro
duction of stout paper bags. Machines of
this type are available with the necessary means for ensuring that a finely divided pro
duct such as flour does not inhibit the heat
sealing operation.It will be appreciated that
before the two adjacent layers of plastics
film can be heat-sealed their adjoining surfaces must be substantially free of flour.
According to the present invention, it is
thus possible to produce a package of flour
or the like which looks very similar to the traditional pack, but which can be produced far more cheaply on simpler, cheaper and smaller machinery.
WHAT WE CLAIM IS:- 1. A method of packing flour and the like, in which a two-ply web of paper and plastics film is used to form bags on an automatic packaging machine of the "form, fill and seal" type, the web comprising a layer of paper of 30 to 50 gsm (g/m2) adhesive-bonded to a perforated film of an alkylene polymer or copolymer, the film being of 25 to 50 microns thickness and having a perforation size of 0.5 to 2 mm diameter and a perforation distribution of 5,000 to 20,000 perforations/m2, whereby packs are produced having a paper exterior resembling a traditional stout paper flour bag.
2. A method according to Claim 1, in which the film is a polyethylene film.
3. A method according to Claim 2, in which the film is a polyethylene/EVA copolymer film.
4. A method according to any of Claims 1 to 3, in which the film thickness is about 38 microns,
5. A method according to any of the preceding claims, in which the film has perforations of approximately 1 mm diameter.
6. A method according to any of the preceding claims in which the perforations are at a distribution of about 10,000 per forations/m2.
7, A method according to any of the preceding claims in which one surface of the film has been treated with a corona discharge before lamination.
8. A method according to any of the preceding claims in which the paper weight is about 36 gsm.
9. A method according to any of the preceding claims in which the two-ply web is adhesive-bonded with one of the following adhesives, namely
1. a single component polyurethane ad
hesive;
2. a two component urethane adhesive;
3. an epoxy adhesive; or
4. a single component thermoplastic
and/or curing adhesive in water-borne
form.
10. A method of packing flour or the like according to Claim 1, substantially as herein described.
11. A pack of flour or the like comprising a two-ply bag formed from a two-ply web as defined in Claim 1, formed in situ
and heat-sealed, the paper layer being on the outside of the bag.
12. A pack according to Claim 11 in which the two-ply web comprises paper of about 36 gsm adhesive bonded to a polyethylene film of about 38 microns thickness
having perforations of about 1 mm in
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (22)
- **WARNING** start of CLMS field may overlap end of DESC **.70 produced by British Cellophane Limited.As stated, the thickness of the film should be from 25 to 50 microns and a thickness of about 38 microns is preferred. The film must be perforated. The preferred size of perforation is about lmm diameter at a distribution of about 10,000 perforationlm2, preferably in a square array. It is also preferred that one surface of the film is treated with a corona discharge in order to facilitate adhesive bonding.The paper to which the above film is laminated may be any suitable packaging paper of the required strength, but is is essential that its thickness is such that its weight does not exceed 50 gsm. Higher weight papers cause problems with heat sealing, leading to weak packages. The paper may be printed before or after lamination, using any convenient printing technique.The adhesive used for the lamination may be any adhesives suitable for bonding a polyalkylene film to paper. Some preferred adhesives are: 1. a single component polyurethane ad hesive, supplied solventless or in an organic solvent; 2. a two component polyurethane ad hesive; 3. an epoxy adhesive, for example an epoxyamme. epoxyamide or epoxy uretane; or 4. a single component thermoplastic and/ or curing adhesive in water-borne form, for example a vinyl or acrylic copolymer polyisoprene, synthetic rub ber, synthetic butadiene, or polyacrylo nitrile, or ABS.Adhesives 1 or 2 or preferred.The "form, fill and seal" machinery which can be used with the laminated film according to the present invention may comprise any suitable machine which is commercially available for use with heat-sealable plastics films. A typical example is the L2CS Form Fill Seal Machine sold under the Trade Name Maidstone Triangle, distributed by Maidstone Packaging Equipment Limited of Whitstable, Kent. Such machines are commonly used for the packaging of confectionary or particulate materials such- as whole rice or dried peas. Such machines are compact and are very much cheaper than the elaborate machinery required for the pro duction of stout paper bags. Machines of this type are available with the necessary means for ensuring that a finely divided pro duct such as flour does not inhibit the heat sealing operation.It will be appreciated that before the two adjacent layers of plastics film can be heat-sealed their adjoining surfaces must be substantially free of flour.According to the present invention, it is thus possible to produce a package of flour or the like which looks very similar to the traditional pack, but which can be produced far more cheaply on simpler, cheaper and smaller machinery.WHAT WE CLAIM IS:- 1. A method of packing flour and the like, in which a two-ply web of paper and plastics film is used to form bags on an automatic packaging machine of the "form, fill and seal" type, the web comprising a layer of paper of 30 to 50 gsm (g/m2) adhesive-bonded to a perforated film of an alkylene polymer or copolymer, the film being of 25 to 50 microns thickness and having a perforation size of 0.5 to 2 mm diameter and a perforation distribution of 5,000 to 20,000 perforations/m2, whereby packs are produced having a paper exterior resembling a traditional stout paper flour bag.
- 2. A method according to Claim 1, in which the film is a polyethylene film.
- 3. A method according to Claim 2, in which the film is a polyethylene/EVA copolymer film.
- 4. A method according to any of Claims 1 to 3, in which the film thickness is about 38 microns,
- 5. A method according to any of the preceding claims, in which the film has perforations of approximately 1 mm diameter.
- 6. A method according to any of the preceding claims in which the perforations are at a distribution of about 10,000 per forations/m2.
- 7, A method according to any of the preceding claims in which one surface of the film has been treated with a corona discharge before lamination.
- 8. A method according to any of the preceding claims in which the paper weight is about 36 gsm.
- 9. A method according to any of the preceding claims in which the two-ply web is adhesive-bonded with one of the following adhesives, namely 1. a single component polyurethane ad hesive; 2. a two component urethane adhesive; 3. an epoxy adhesive; or 4. a single component thermoplastic and/or curing adhesive in water-borne form.
- 10. A method of packing flour or the like according to Claim 1, substantially as herein described.
- 11. A pack of flour or the like comprising a two-ply bag formed from a two-ply web as defined in Claim 1, formed in situ and heat-sealed, the paper layer being on the outside of the bag.
- 12. A pack according to Claim 11 in which the two-ply web comprises paper of about 36 gsm adhesive bonded to a polyethylene film of about 38 microns thickness having perforations of about 1 mm indiameter at a distribution of about 10,000 perforations /m2.
- 13. A two-ply web comprising a layer of paper of 30 to 50 gsm adhesive bonded to a perforated film of an alkylene polymer or copolymer, the film being of 25 to 50 microns thickness and having a perforation size of 0.5 to 2 mm diameter and a perforation distribution of 5,000 to 20,000 perforations/m2.
- 14. A web according to Claim 13, in which the plastics film is a polyethylene film.
- 15. A web according to Claim 14, in which the film is a polyethylene/EVA Co- polymer film.
- 16. A web according to any of Claims 13 to 15 in which the film has a thickness of about 38 microns.
- 17. A web according to any of the claims 13 to 16 in which the film has perforations of approximately 1 mm diameter.
- 18. A web according to any of Claims 13 to 17 in which the perforations are at a distribution of about 10,000 perforations/m2.
- 19. A web according to any of Claims 13 to 18 in which the film has been treated with a corona discharge before lamination.
- 20. A web according to any of Claims 13 to 19 in which the paper weight is about 36 gsm.
- 21. A web according to any of Claims 13 to 20, adhesive-bonded with one of the adhesives listed in Claim 9.
- 22. A two-ply web according to any of Claims 13 to 21, substantially as herein described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB37222/77A GB1604830A (en) | 1978-05-30 | 1978-05-30 | Laminate for packaging flour |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB37222/77A GB1604830A (en) | 1978-05-30 | 1978-05-30 | Laminate for packaging flour |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1604830A true GB1604830A (en) | 1981-12-16 |
Family
ID=10394762
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB37222/77A Expired GB1604830A (en) | 1978-05-30 | 1978-05-30 | Laminate for packaging flour |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1604830A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0060047A1 (en) * | 1981-02-23 | 1982-09-15 | Douglas Kitchener Gatward | Sheet material |
| US4861632A (en) * | 1988-04-19 | 1989-08-29 | Caggiano Michael A | Laminated bag |
| US5141795A (en) * | 1984-12-03 | 1992-08-25 | Asahi Chemical Polyflex Ltd. | Laminated film for forming an easily openable tightly sealed bag |
-
1978
- 1978-05-30 GB GB37222/77A patent/GB1604830A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0060047A1 (en) * | 1981-02-23 | 1982-09-15 | Douglas Kitchener Gatward | Sheet material |
| US4515840A (en) * | 1981-02-23 | 1985-05-07 | Gatward Douglas Kitchener | Sheet material |
| US5141795A (en) * | 1984-12-03 | 1992-08-25 | Asahi Chemical Polyflex Ltd. | Laminated film for forming an easily openable tightly sealed bag |
| US4861632A (en) * | 1988-04-19 | 1989-08-29 | Caggiano Michael A | Laminated bag |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |