GB2487711A - Atmosphere control pad for use in packaging - Google Patents

Atmosphere control pad for use in packaging Download PDF

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Publication number
GB2487711A
GB2487711A GB1020587.0A GB201020587A GB2487711A GB 2487711 A GB2487711 A GB 2487711A GB 201020587 A GB201020587 A GB 201020587A GB 2487711 A GB2487711 A GB 2487711A
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Prior art keywords
carbon dioxide
oxygen generating
absorbing device
dioxide absorbing
packaging
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GB1020587.0A
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GB201020587D0 (en
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Nigel John Brace Parker
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Individual
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Individual
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Priority to GB1020587.0A priority Critical patent/GB2487711A/en
Publication of GB201020587D0 publication Critical patent/GB201020587D0/en
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B13/00—Oxygen; Ozone; Oxides or hydroxides in general
    • C01B13/02—Preparation of oxygen
    • C01B13/0203—Preparation of oxygen from inorganic compounds
    • C01B13/0211—Peroxy compounds
    • C01B13/0214—Hydrogen peroxide
    • 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
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/24—Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants
    • B65D81/26—Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants with provision for draining away, or absorbing, or removing by ventilation, fluids, e.g. exuded by contents; Applications of corrosion inhibitors or desiccators
    • B65D81/266—Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants with provision for draining away, or absorbing, or removing by ventilation, fluids, e.g. exuded by contents; Applications of corrosion inhibitors or desiccators for absorbing gases, e.g. oxygen absorbers or desiccants
    • B65D81/267—Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants with provision for draining away, or absorbing, or removing by ventilation, fluids, e.g. exuded by contents; Applications of corrosion inhibitors or desiccators for absorbing gases, e.g. oxygen absorbers or desiccants the absorber being in sheet form
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B13/00—Oxygen; Ozone; Oxides or hydroxides in general
    • C01B13/02—Preparation of oxygen
    • C01B13/0203—Preparation of oxygen from inorganic compounds
    • C01B13/0207—Water
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
    • C01D7/00—Carbonates of sodium, potassium or alkali metals in general
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
    • C01D7/00—Carbonates of sodium, potassium or alkali metals in general
    • C01D7/10—Preparation of bicarbonates from carbonates

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Food Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Wrappers (AREA)
  • Packages (AREA)
  • Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
  • Laminated Bodies (AREA)

Abstract

A device, comprising a laminate pad packaging inclusion, fabricated from a composite of fabric materials, permeable to gases and containing a formulation, including sodium carbonate peroxyhydrate or sodium perborate, which is capable, on hydration, of both generating oxygen and absorbing carbon dioxide, being designed to maintain a predetermined respective percentage composition of oxygen and carbon dioxide in both MA and CA packed foods, by actively compensating for changes within the pack atmosphere. The active chemicals may be bonded to a carrier web using an adhesive applied in a grid pattern.

Description

ASOUD STATE SYSTEM_DESIGNED TO MAINTAIN A PREDETERMINED QAS
COMPQSITION IN_ MODIFIED. ATMOSPHERE (MAL OR CONTROLLED ATMOSPHERE [CA) PACKED FQO_D$. BY_ACTIVELY COMPENSATING FOR ANY
CHANGES IN THE QAS COMPOSITION
1. Introduction to the invention
2. Field of the Invention
3. This invention relates to a combined oxygen generating and carbon dioxide absorbing, food packaging inclusion, in the form of a pad composed of layers of fabric, which are coated in a range of powdered, water vapour activated compounds.
4. This device has been designed, as an active inclusion, for use within both conventional modified atmosphere (MA) and elevated oxygen controlled atmosphere (CA) retail food packaging, to maintain the percentage of oxygen and carbon dioxide within a pack atmosphere of a pre-determined gas composition, which will provide a quality maintained, extended shelf life of packed whole and prepared fresh produce.
5. Description of the Related Art
6. The expansion of retail convenience foods into the area of whole and prepared fresh fruit and vegetables is now a well-established, but still growing, market, providing a wide range of ready to eat' and ready to cook' products, in a number of retail packaging formats.
7. The majohty of these packaging formats, however, rely on either MA, or, to a much lesser but growing extent, CA packaging systems 8. MA and CA packing employ two entirely different packaging technologies, although each, in their particular application, aims to provide the dual benefits of maintained quality and an extended shelf life for a range of retail food products.
9. In the case of MA packing, the system operates on the precept that the partial suppression of aerobic respiration both reduces metabolic activity and retards senescence. This is achieved by lowering the percentage composition of oxygen within the pack atmosphere and raising that of carbon dioxide.
10. Modified Atmosphere Packaging (MAP) is characterised by: - * a hermetic pack closure, * gas permeable packaging materials with gas transmission rates, which, in concert with the respiration activity of the product, will allow a pack atmosphere of a predetermined composition to be established, known as an Equilibrium Modified Atmosphere (EMA), usually within the range 5% -10% 02, 5% -10% CO2 and 80% - 90% N2, assisted on occasion by * the replacement, at the time of packing, of the ambient atmosphere within the pack, by a pack atmosphere with a composition approaching, or matching, that of the intended EMA.
11. This technology generally relies on nano/micro (50p -200p) perforated films and is mainly employed in horizontal or vertical, form, fill and seal pouches, in which there is generally a large surface area to product mass ratio.
12.Alternatively, if the fresh produce is packed in a heat-seal, lidded tray, only the lidding film is effectively available for gas transmission, providing a very low surface area to product mass ratio. MA packing, unsupported by an active inclusion, is unlikely to achieve an extended shelf life, although it will prove satisfactory for a shelf life of the pack date plus five days -P+5.
13. The inherent weakness of retail MAP systems is that the gas transmission rate of the packaging is finite, whereas the respiratory activity of the product is directly proportional to temperature. This means that MAP systems can only operate effectively within very narrow temperature ranges. At temperatures outside these ranges, the system fails to operate effectively, especially if the temperatures are above the range limit, as this can be catastrophic, with the product respiration rapidly becoming anaerobic, from which there is no recovery. It is possible that such an event could even occur on P÷1.
14.To counter this problem, it is, however, also possible to employ active packaging in the form of 02 generator/CO2 absorber inclusions. These will be able to prevent anaerobiosis, but due to the gas permeability of the packaging, can not be guaranteed to precisely maintain a target EMA.
15. Controlled Atmosphere Packaging (CAP) on the other hand, is characterised by: - * a hermetic closure * gas impermeable/barrier packaging materials, * the complete replacement of the ambient atmosphere within the pack, at the time of packing, by a pack atmosphere of a predetermined gas composition, which in this case would have a target of 98% 02 and 2% N2, and is not intentionally allowed to be modified by the respiratory activity of the packed product, * the support of the pre-determined pack atmosphere by employing active packaging in the form of 02 generator/CO2 absorber inclusions 16. Actively supported CAP has the advantage over MAP in that, until the end of a pre- established shelf life, it avoids anaerobiosis and the consequent off-odours and off-flavours associated with this. As a result, the quality throughout the shelf life of a product, packed under an elevated oxygen CA, compares very favourably with same products packed under either an ambient atmosphere or MAP conditions.
17. Actively supported CAP also has the added advantage of being much more robust in situations of temperature abuse. As already stated, anaerobiosis is avoided until the end of a pre-established shelf life, when the support system will have become exhausted. Under elevated temperature conditions, which lead to increased respiratory activity of the packed produce, this state may arise earlier and as a consequence the shelf-life may be slightly for-shortened, with the product remaining unaffected until this occurs.
18. Actively supported CAP, because it is not restricted by the limitations imposed by the gas transmission characteristics of permeable packaging materials, can be employed in the packaging of a broader range of retail foods.
19.To date, there have been no solid state oxygen generating devices employed in retail food packaging and none, which combine an oxygen generating capacity with a carbon dioxide absorbing capacity. There are available, however, both oxygen absorbing devices, containing iron powder, heavy metal catalytic converters or organic reducing agents, and carbon dioxide absorbing products, containing sodium carbonate, all of which are marketed in the form of sachets fabricated from gas-permeable materials or solid state pads.
20. This sachet format, however, has a number of drawbacks when compared to solid state packaging inclusions, as identified below: - * there are the risks that, as the filled sachet is placed together with the food as a free inclusion within the sealed packaging, the consumer may inadvertently ingest the sachet with the food or in mistaking the inclusion as a condiment or dressing, add it to the food, * the positioning of the sachet may change so as to affect adversely the aesthetic presentation of the product as a whole, * the fill material within the sachet is loose and free flowing, therefore there is no control over the mass in contact with the surface area available for reaction, which can result in an inconsistent performance, 21. The invention is intended to produce a solid state pad, composed of layers of fabric, the carrier web, each coated in a pre-determined, homogenous mixture of finely powdered, water vapour activated compounds, which can be secured to any specified location on the internal surface of packaging used for either MA, or CA packed foods, or any other products requiring a pack atmosphere maintained at a pre-determined gas composition.
22. This invention can be more fully understood from the following detailed description with accompanying drawings, in which: -Figure 1. shows the adhesive bonding of the fill material to the carrier web, Figure 2. shows the lamination of between 5 and 10, fill material coated, layers of the carrier web, with both cover and backing webs and the cutting of the laminate into pads or ribbons, Figure 3. shows an enlarged cross-section through a laminated pad to indicate the structure and functional relationship between the layers.
* in figure 1. a non water-based, pressure activated adhesive 1, or a material of equivalent characteristics and performance, is applied by employing an adhesive transfer roller 2 and a profiled adhesive application roller 3 & 4, in a pre-determined grid pattern 5, to the carrier web, being a l7gm/sqrn, spun-bonded, polypropylene fabric 6, or a material of equivalent characteristics and performance.
* the individual adhesive application areas will have dimensions in the range of 25mm x 25mm to 35mm x 35mm XX, which are separated by 6mm wide, adhesive-free grid linesYY, * a pre-determined, homogenous mixture of sodium carbonate peroxyhydrate, sodium hydrogen carbonate, activated Bentonite clay (or alternatively a zeolite) and sodium chloride, as a medium to fine powder, with particulate diameters in the range of lOOp-150p, is applied uniformly, as the fill material 7, at a rate of 450gm/sqm - 900gm/sqm and pressure-bonded 8 to the adhesive coated, carrier web, being a l7gm/sqm, spun-bonded, polypropylene, fabric 9 & 10, * in figure 2. the production of a laminate pad, is effected by inter-layer, indexing and printing web technology to thermo-bond or radio-bond together 11 (figure 3. 17), 5 to layers of the fill material coated, carrier web 9, along the pre-determined grid lines between the areas of adhesive application, with the required amount of the fill material/sqm in a particular pad size being achieved by the number of carrier web layers employed.
* the simultaneous over-laminating, by either thermo-bonding or radio-bonding, along the pre-determined grid lines (figure 3. 18), of the upper surface of the layers of the fill material coated, carrier web, with a 23gm/sqm, hydrofuge, carded, polypropylene fabric 12, or a material of equivalent characteristics and performance, by employing both inter-layer indexing and printing web technology, * the simultaneous over-laminating and thermo-bonding, or radio-bonding along the pre-determined grid lines (figure 3. 18), of the lower surface of the layers of the fill material coated, l7gm/sqm, spun-bonded, polypropylene fabric, with a 28gm/sqm, water-proof polypropylene (l4gm/sqm) + polyethylene (l4gmlsqm) film backing sheet 13, or a material of equivalent characteristics and performance, by employing both inter-layer indexing and printing web technology, * the optional application 14, to the above backing sheet, of a contact adhesive layer, protected by a cellulose based, easy-peel material 15, or a material of equivalent characteristics and performance, * the roller-slitting/die-cutting 16 of the laminated material, as required, into a potentially wide range of pad formats and sizes 17, along the centres of the thermo-bonded, or radio bonded track areas (figure 3.18), * the optional roller/die-cutting of the laminated material into continuous ribbons 17, of variable widths, along the centres of the thermo-bonded, or radio bonded tack areas (figure 3, 18), * in figure 3., which is an enlargement of the section AA, as shown in figure 2., the cover sheet 12 and the backing sheet 13 are enclosing 5 layers of the fill material 7 coated, carrier web 9 and these are thermo-bonded, or radio bonded 18 together along the midline of the adhesive-free grid pattern 4, with the optional, indexed application of a self-adhesive layer 19, to only the areas bounded by the gridlines, protected by a layer of cellulose-based, easy-peel material 20, * the minimum pad size, or ribbon width is determined by the dimensions of the single adhesive application area on the grid pattern selected, although there is theoretically no limit to the maximum pad size produced, which will be a multiple of the particular adhesive application area employed.
23. The additional criteria, apart from its performance in pack atmosphere control, which this device has had to meet to be acceptable as a food packaging inclusion, are as follows:- * to be discrete and unobtrusive within the retail pack, * the retention of the adhesive bonded reagent compounds * an opaque outer surface which will allow print of high definition, * the packaging materials and the adhesive bonded reagent compounds to meet all current EU materials in contact with food' regulations, 24. The device meets these criteria.
25. The device can be readily produced in a range of sizes, allowing the provision of a reagent mass specific to the pack atmosphere maintenance requirements of the packaged products concerned.
26. In the device, the reagent compounds, as stated above, are a mixture, principally of sodium carbonate peroxyhydrate medium to fine powder (150p -200p), sodium carbonate in the form of medium to fine powder (l50p -200p), anhydrous sodium chloride as free flowing medium to fine powder (1 SOp -200p) and an activated Bentonite clay (or alternatively a zeolite), in the form of a fine powder (150p -200p), although other compounds, listed in the summary may be included.
27. The activated Bentonite clay (or alternatively a zeolite), as a medium to fine powder, has a very large capacity to absorb water, as water vapour, from the atmosphere.
28.Activated Bentonite clays and zeolites are aluminosilicates of alkali metals. They have three dimensional crystalline frameworks of tetrahedral silica or alumina anions strongly bonded at all corners. These structures contain -Si-O--Al--linkages that form surface pores of uniform diameter and enclose regular internal cavities and channels of discrete sizes and shapes, depending on the chemical composition and crystal structure structures of the specific activated clay or zeolite involved. The pore sizes range from 2.0 to 4.3 Angstroms and the enclosed cavities both the mineral cations and water molecules, the latter being capable of desorption as well as adsorption.
29. The porosity of the l7gmfsqm, spun-bonded, polypropylene fabric, with a 23gm/sqm, hydrofuge, carded, polypropylene fabric surface layer of the laminated fabric pad, as determined using a Gurley densitometer spot tester, was not less than 850m1 of water vapour/mm/sq. in, minimum permeability, which is essential for the device to be effective.
30. The number of laminations and overall dimensions of a pad selected will reflect the mass of the fill material required to provide the pack atmosphere control desired.
31.The formulation, in terms of the percentage composition of the constituent fill material, is designed to provide the pack atmosphere control required and is thus specific to the packaged product concerned and will vary from product to product.
32. In another aspect of this invention, the device can also include, adhesive bonded to selected layers of the carrier web of 1 7gm/sqm, spun-bonded, polypropylene fabric, medium to finely powdered mixtures of other solid compounds, which are capable, when hydrated by water vapour, of either generating or absorbing other gases, designed to complement the oxygen generating and carbon dioxide absorbing function of the device.
33.As an example of the above, in another aspect of this invention, the device can also include, adhesive bonded to selected carrier web layers of l7gm/sqm, spun-bonded, polypropylene fabric, a medium to finely powdered mixture of sodium bicarbonate, citric acid and an activated Bentonite clay (or alternatively a zeolite).
34.As a further example of the above, in another aspect of this invention, the device can also include, adhesive bonded to selected carrier web layers of l7gm/sqm, spun-bonded, polypropylene fabric, a medium to finely powdered mixture of sodium erythorbate and an activated Bentonite clay (or alternatively a zeolite).
35. In operation, the sodium carbonate peroxyhydrate (or alternatively sodium perborate) and sodium carbonate are activated by contact with water, in the form of water vapour, which is present in the pack atmosphere at levels approaching 100% RH.
36. The oxygen generating reaction formulae are as follows: -37. 1 H0 i) Na2CO3.3/2H20 3 NaCO3 + 3/2H202 3 NaCO3 + 3/2H20 + 3/402 sodium carbonate peroxyhydrate 38. or alternatively ii) H20Na2B208H4 3 2NaBO2 + 2H202 3 2NaBO2 + 2H20 +02 sodium perborate 39. The carbon dioxide absorbing reaction is as follows: -Na2CO3 + CO2 + H20 3 2NaHCO3 sodium carbonate 40. In order to control the rate of reaction and allow it to continue over a predetermined, extended period, the availability of water is regulated by the percentage composition of both the sodium chloride component and the activated Bentonite clay (or alternatively a zeolite) component, which are strongly hydroscopic and absorb water vapour from the pack atmosphere much more readily than does either the sodium carbonate peroxyhydrate or sodium carbonate, thus restricting effectively the amount of water, in the form water vapour, available to the latter compounds.
Summary of the lnvetion
41.The device, in this invention, comprises a laminate pad packaging inclusion, fabricated from a composite of fabric materials, permeable to gases and containing a formulation, including sodium carbonate peroxyhydrate, which is capable, on hydration, of both generating oxygen and absorbing carbon dioxide, being designed to maintain a predetermined respective percentage composition of oxygen and carbon dioxide in both MA and CA packed foods, by actively compensating for changes within the pack atmosphere.
42.The laminate is composed of between 5 and 10 layers of a l7gm/sqm, spun-bonded, polypropylene fabric, 43.The l7gm/sqm, spun-bonded, polypropylene fabric is coated, on the upper surface only, with an adhesive bonded mixture of four powders, the major component being sodium carbonate peroxyhydrate, which generally comprises at least 50% by weight of the fill material mass, in the form of a fine to medium powder, with particle dimensions in the range of lOOp-I 5Op (lOOmesh -7Omesh).
44.The sodium carbonate peroxyhydrate can be supplemented by a minority addition of calcium peroxide, in the form of a fine to medium powder, with dimensions in the range of lOOp-i SOp (lOOmesh -7omesh).
45.The second component is food grade sodium chloride, which generally comprises no more than 16% by weight of the fill material mass, in the form of a fine to medium crystalline powder, with dimensions in the range of lOOp-i 5Op (lOOmesh -7omesh).
46.The third component is an activated Bentonite clay, which generally comprises no more than 16% by weight of the fill material mass, in the form of a fine to medium powder, with dimensions in the range of I OOp-I 50p (1 OOmesh -7Omesh).
47.An alternative third component is a zeolite, which generally comprises no more than 16% by weight of the fill' mass, in the form of a fine to medium powder, with dimensions in the range of lOOp-I SOp (lOOmesh -7omesh).
48. The fourth component is food grade sodium carbonate, which generally comprises no more than 20% by weight of the fill material mass, in the form of a fine to medium powder, with dimensions in the range of IOOp-150p (lOOmesh -7omesh).
49.Additional components can include sodium bicarbonate, citric acid with activated Bentonite clay, as a mixture in the form of a fine to medium powder, with dimensions in the range of lOOp-l5Op (lOOmesh -70mesh), applied selectively to predetermined, carrier web layers within the laminate.
50.A further, additional component can include sodium erythorbate with an activated Bentonite clay, as a mixture in the form of a fine to medium powder, with dimensions in the range of lOOp-l5Op (lOOmesh -7omesh), applied selectively to predetermined carrier web layers within the laminate.
51. In order, when in contact with food, to protect fully, in both dry and hydrated states, the fill material coating to the top layer of 1 7gm/sqm, spun-bonded, polypropylene fabric, as well as the device overall, the pad is covered with a layer of a 23gm/sqm, hydrofuge, carded, polypropylene fabric.
52. In order, when in contact with food, to protect fully, in both dry and hydrated states, the lower layer of llgm/sqm, spun-bonded, polypropylene fabric, as well as the device overall, the pad is covered with a water-proof, polypropylene and polyethylene film backing sheet.
53. The optional application, to the above backing sheet, of a sectional, contact adhesive layer, protected by a cellulose based, easy-peel fabric.
54. The pad is formed, by roller-slitting/die-cutting into rectangular shapes, with external dimensions generally ranging from 31mm -248mm in length x 31mm -217mm in width, depending on the oxygen generating and carbon dioxide absorbing requirements of the packed products concerned.
55.As an option to the above, the pad can be formed as a sectional ribbon, in a range of widths, which can be wound on a reel for automated application.
56. The fill material mass of the pad is determined by both the overall dimensions and the number of carrier web layers selected to provide the oxygen generating and carbon dioxide absorbing requirements of the packed products concerned.
57.The pads will have a surface area to fill material mass ratio for gas transmission ranging from 1:8.75 to 1:2, which is determined by the number of powder coated, l7gm/sqm, spun-bonded, polypropylene fabric carrier web layers deployed.
58.The pads, employed as a retail food packaging inclusion, will have dimensions, which allow them to be relatively unobtrusive.

Claims (28)

  1. Claims 1. A device, comprising a laminate pad packaging inclusion, fabricated from a composite of materials, permeable to gases, and containing a formulation, including sodium carbonate peroxyhydrate, which is capable, on hydration, of both generating oxygen and absorbing carbon dioxide, being designed to maintain a predetermined percentage composition of both oxygen and carbon dioxide in both MA and CA packed foods, by actively compensating for changes within the pack atmosphere.
  2. 2. The oxygen generating and carbon dioxide absorbing device according to claim 1, wherein the sodium carbonate peroxyhydrate is a manufactured, medium to fine powder.
  3. 3. The oxygen generating and carbon dioxide absorbing device according to claim 1, wherein the sodium carbonate peroxyhydrate can be complemented by a minority addition of sodium carbonate, in the form of a manufactured, medium to fine powder.
  4. 4. The oxygen generating and carbon dioxide absorbing device according to claim 1, wherein the sodium carbonate peroxyhydrate can be supplemented by a minority addition of sodium perborate, in the form of a manufactured, medium to fine powder.
  5. 5. The oxygen generating and carbon dioxide absorbing device according to claim 1, wherein the sodium carbonate peroxyhydrate can be replaced by sodium perborate, in the form of a manufactured, medium to fine powder.
  6. 6. The oxygen generating and carbon dioxide absorbing device according to claim 1, wherein the sodium carbonate peroxyhydrate can be supplemented by a minority addition of calcium peroxide, in the form of a manufactured, medium to fine powder.
  7. 7. The oxygen generating and carbon dioxide absorbing device according to claim 1, wherein the sodium carbonate peroxyhydrate can be complemented by a minority addition of an activated Bentonite clay, in the form of a manufactured, fine powder.
  8. 8. The oxygen generating and carbon dioxide absorbing device according to claim 1, wherein the sodium carbonate peroxyhyd rate can be complemented by a minority addition of a zeolite, in the form of a manufactured, fine powder.
  9. 9. The oxygen generating and carbon dioxide absorbing device according to claim 1, wherein sodium carbonate peroxyhydrate can be complemented by a minority addition of sodium chloride, in the form of a manufactured, medium to fine crystalline powder.
  10. 1O.The oxygen generating and carbon dioxide absorbing device according to claim 1, wherein the additional components of sodium bicarbonate, citric acid, with an activated Bentonite clay, as a mixture and in the form of a medium to fine powder, are applied to selected carrier web layers within the laminate.
  11. 11. The oxygen generating and carbon dioxide absorbing device according to claim 1, wherein the additional components of sodium erythorbate with an activated Bentonite clay, as a mixture and in the form of a medium to fine powder, are applied to selected carrier web layers within the laminate.
  12. 12.The oxygen generating and carbon dioxide absorbing device according to claim 1, wherein the percentage composition of the components in the formulation can be adjusted to meet the particular oxygen generating and carbon dioxide absorbing demands of the packed products concerned.
  13. 13.The oxygen generating and carbon dioxide absorbing device according to claim 1, wherein the formulation is activated by water, in the form of water vapour when present at high relative humidity levels in the pack atmosphere.
  14. 14. The oxygen generating and carbon dioxide absorbing device according to claim 1, wherein the rate of reaction and thus the operating life of the formulation is controlled by the predetermined percentage composition of the strongly hydroscopic sodium chloride and activated Bentonite clay (or alternatively a zeolite) components, which absorb water vapour from the pack atmosphere much more readily than does either the sodium carbonate peroxyhydrate or its supplements and sodium carbonate, effectively restricting the amount of water available to the latter compounds.
  15. 15.The oxygen generating and carbon dioxide absorbing device according to claim 1, wherein the packaging inclusion is a laminate pad composed of carrier web layers of fabric coated in a range of medium to finely powdered, water vapour activated compounds.
  16. 16.The oxygen generating and carbon dioxide absorbing device according to claim 1, wherein the packaging inclusion is a laminate pad, in which a non water-based, pressure activated adhesive, is applied in a pre-determined grid pattern to a carrier web of a spun-bonded, polypropylene fabric.
  17. 17. The oxygen generating and carbon dioxide absorbing device according to claim 1, wherein the packaging inclusion is a laminate pad, in which a homogenous, pre-determined mixture of sodium carbonate peroxyhydrate, sodium hydrogen carbonate, activated Bentonite clay (or alternatively a zeolite) and sodium chloride, in the form of a medium to fine powder, is applied uniformly and pressure-bonded to the adhesive coated, carrier web of spun-bonded, polypropylene, fabric.
  18. 18. The oxygen generating and carbon dioxide absorbing device according to claim 1, wherein the packaging inclusion is a laminate pad, in which the required amount of the compounds/sqm in a particular pad size, is achieved by laminating together, either by thermo-bonding or radio-bonding along the pre-determined grid lines between the areas of adhesive application, a pre-determined number of the carrier web layers of the, now powder-coated, spun-bonded, polypropylene fabric, by employing inter-layer indexing and printing web technology.
  19. 19.The oxygen generating and carbon dioxide absorbing device according to claim 1, wherein the packaging inclusion is a laminate pad, in which the upper surface is over-laminated, by either thermo-bonding or radio-bonding along the pre-determined grid lines, the upper surface of the now bonded, laminated carrier web layers of the powder coated, spun-bonded, polypropylene fabric, with a hydrofuge, carded, polypropylene fabric, by employing inter-layer indexing and printing web technology.
  20. 20.The oxygen generating and carbon dioxide absorbing device according to claim 1, wherein the packaging inclusion is a laminate pad, in which the lower surface is over-laminated, by thermo-bonding or radio-bonding along the pre-determined grid lines, the lower surface of the now bonded laminated carrier web layers of the powder coated, spun-bonded, polypropylene fabric, with a water-proof polypropylene + polyethylene film backing sheet, by employing inter-layer indexing and printing web technology.
  21. 21.The oxygen generating and carbon dioxide absorbing device according to claim 1, wherein the packaging inclusion is a laminate pad, in which the above backing sheet has an application of a contact adhesive layer, protected by a cellulose based, easy-peel material.
  22. 22.The oxygen generating and carbon dioxide absorbing device according to claim 1, wherein the packaging inclusion is a laminate pad, which has been roller-slit/die-cut, along predetermined grid lines, into the sizes required.
  23. 23.The oxygen generating and carbon dioxide absorbing device according to claim 1, wherein the packaging inclusion is a laminate pad, which has been roller-slit, along predetermined grid lines, into sectional ribbon, in a range of widths, which can be wound on a reel for automated application..
  24. 24.The oxygen generating and carbon dioxide absorbing device according to claim 1, wherein the additional components of sodium bicarbonate and citric acid with an activated Bentonite clay, as a mixture and in the form of a medium to fine powder, are applied to selected layers within the laminate.
  25. 25.The oxygen generating and carbon dioxide absorbing device according to claim 1, wherein the additional components of sodium erythorbate with an activated Bentonite clay, as a mixture and in the form of a medium to fine powder, are applied to selected carrier web layers within the laminate.
  26. 26.The oxygen generating and carbon dioxide absorbing device according to claim 1, wherein the packaging inclusion is a laminate pad, in which the fill material formulation is adjusted to accommodate the particular oxygen generating and carbon dioxide absorbing demands of the packed products concerned.
  27. 27. The oxygen generating and carbon dioxide absorbing device according to claim 1, wherein the packaging inclusion is a laminate pad and acts as secondary packaging, being inserted into the primary packaging at the time of packing.
  28. 28.A food secondary packaging system, according to claim 27, wherein the primary packaging is represented either by thermo-formed container, with heat-seal applied lidding film closures, or by either horizontal or vertical, form, fill and seal produced pouches or bags.
GB1020587.0A 2010-12-04 2010-12-04 Atmosphere control pad for use in packaging Withdrawn GB2487711A (en)

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Publication number Priority date Publication date Assignee Title
WO2012156685A3 (en) * 2011-05-18 2013-03-07 Emco Packaging Systems Ltd. Packaging inclusion for controlling or modifying the atmosphere in packaging

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US4528228A (en) * 1983-10-11 1985-07-09 Michelsen Packaging Company Atmosphere control cushioning pad
JPS63156001A (en) * 1986-08-07 1988-06-29 Meiwa Kouyu Kk Oxygen generating member
WO1999062790A1 (en) * 1998-06-02 1999-12-09 Sealed Air (New Zealand) Limited Carbon dioxide atmosphere modifiers for packaging
US6254946B1 (en) * 1997-06-30 2001-07-03 Mitsubishi Gas Chemical Company, Inc. Oxygen-absorbing component, oxygen absorbent package and oxygen-absorbing multilayered body containing same
US20060172048A1 (en) * 2005-01-21 2006-08-03 Etchells Marc D Food preservation systems
WO2007134176A2 (en) * 2006-05-10 2007-11-22 Microban Products Company Antimicrobial food pad
GB2450860A (en) * 2007-04-11 2009-01-14 Nigel John Brace Parker An oxygen producing and carbon dioxide absorbing device for inclusion in food packages
US20100047405A1 (en) * 2007-02-21 2010-02-25 Sayandro Versteylen Absorbent pad to preserve freshness for consumer food storage

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Publication number Priority date Publication date Assignee Title
US4528228A (en) * 1983-10-11 1985-07-09 Michelsen Packaging Company Atmosphere control cushioning pad
JPS63156001A (en) * 1986-08-07 1988-06-29 Meiwa Kouyu Kk Oxygen generating member
US6254946B1 (en) * 1997-06-30 2001-07-03 Mitsubishi Gas Chemical Company, Inc. Oxygen-absorbing component, oxygen absorbent package and oxygen-absorbing multilayered body containing same
WO1999062790A1 (en) * 1998-06-02 1999-12-09 Sealed Air (New Zealand) Limited Carbon dioxide atmosphere modifiers for packaging
US20060172048A1 (en) * 2005-01-21 2006-08-03 Etchells Marc D Food preservation systems
WO2007134176A2 (en) * 2006-05-10 2007-11-22 Microban Products Company Antimicrobial food pad
US20100047405A1 (en) * 2007-02-21 2010-02-25 Sayandro Versteylen Absorbent pad to preserve freshness for consumer food storage
GB2450860A (en) * 2007-04-11 2009-01-14 Nigel John Brace Parker An oxygen producing and carbon dioxide absorbing device for inclusion in food packages

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012156685A3 (en) * 2011-05-18 2013-03-07 Emco Packaging Systems Ltd. Packaging inclusion for controlling or modifying the atmosphere in packaging

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