GB1604830A - Laminate for packaging flour - Google Patents

Laminate for packaging flour Download PDF

Info

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
Application number
GB37222/77A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FIRBRET ENG Ltd
Original Assignee
FIRBRET ENG Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by FIRBRET ENG Ltd filed Critical FIRBRET ENG Ltd
Priority to GB37222/77A priority Critical patent/GB1604830A/en
Publication of GB1604830A publication Critical patent/GB1604830A/en
Expired legal-status Critical Current

Links

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

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)

  1. **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. 2. A method according to Claim 1, in which the film is a polyethylene film.
  3. 3. A method according to Claim 2, in which the film is a polyethylene/EVA copolymer film.
  4. 4. A method according to any of Claims 1 to 3, in which the film thickness is about 38 microns,
  5. 5. A method according to any of the preceding claims, in which the film has perforations of approximately 1 mm diameter.
  6. 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. 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. 8. A method according to any of the preceding claims in which the paper weight is about 36 gsm.
  9. 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. 10. A method of packing flour or the like according to Claim 1, substantially as herein described.
  11. 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. 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
    diameter at a distribution of about 10,000 perforations /m2.
  13. 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. 14. A web according to Claim 13, in which the plastics film is a polyethylene film.
  15. 15. A web according to Claim 14, in which the film is a polyethylene/EVA Co- polymer film.
  16. 16. A web according to any of Claims 13 to 15 in which the film has a thickness of about 38 microns.
  17. 17. A web according to any of the claims 13 to 16 in which the film has perforations of approximately 1 mm diameter.
  18. 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. 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. 20. A web according to any of Claims 13 to 19 in which the paper weight is about 36 gsm.
  21. 21. A web according to any of Claims 13 to 20, adhesive-bonded with one of the adhesives listed in Claim 9.
  22. 22. A two-ply web according to any of Claims 13 to 21, substantially as herein described.
GB37222/77A 1978-05-30 1978-05-30 Laminate for packaging flour Expired GB1604830A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (4)

* Cited by examiner, † Cited by third party
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

Similar Documents

Publication Publication Date Title
US2430459A (en) Laminated sheet heat-sealable container
US4101711A (en) Bone resistant packaging material
US3259303A (en) Resealable flexible container
US3768724A (en) Cushioned shipping bag
US4136205A (en) Container and method for packaging meat articles
US4485133A (en) Oxygen absorbent packaging
CA2398033A1 (en) Corrugated packaging and insulation material
US2474619A (en) Heat-sealable sheet material
CA2163655A1 (en) Packaging material comprising a water-soluble film
JP4452918B2 (en) Polymer-coated heat-sealable packaging material, method for producing the material, and sealed packaging container produced by the material and the method
JPH06219473A (en) Multi-compartment package with improved partition
JPH11514595A (en) Laminable package laminate and method of manufacturing the same
ES8500849A1 (en) Packaging material
MX2008009556A (en) Multilayer paper sack.
US2446414A (en) Method of applying heat-sealable labels
US4096946A (en) Laminate for use in packing oil
CA2202634A1 (en) Multilayer materials suitable for making packages
GB1604830A (en) Laminate for packaging flour
CN106564667A (en) Full-automatic hot melt glue packaging system
CZ286607B6 (en) Flexible packaging material
CN111546733B (en) PE blown film, PE composite film, packaging bag and preparation method of packaging bag
US3314211A (en) Method of packaging tacky elastomeric material and packaging paper therefor
GB2355228A (en) Absorbent
CN216103741U (en) Food-grade powder packaging paper
FI82820B (en) FRIKTIONSYTA FOER FOERPACKNINGSFOLIE ELLER ANNAN YTA.

Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee