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
  • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives

Definitions

• the invention regards a hygienic cover - wrapping film with an anti-microbial treatment of the outer surface for protection of printed materials in offices, schools, public libraries and reading rooms.
• the invention comprises manufacturing method of this wrapping film.
• the above-mentioned method can solve problems with mass usage of objects by covering them with a plastic cover, either permanent (e.g. a plastic layer for books) or removable. It protects object against dirt and mechanical damage, or provides passive protection against contamination by disinfectants caused by cleaning.
• An active solution of anti-microbial protection of the outer surface of wrapping film with a permanent antimicrobial agent has been unknown and unused.
• Anti-microbial additives are currently used only in food and medical application with an emphasis on anti-microbial activity of the inner surface clinging to the wrapped object.
• a film for wrapping food according to the patent application PCT WO 2010/057658 can serve as a concrete example. This film is made of LDPE, PLA or PCL and these materials contain lysozyme, thymol or lemon extract as anti-microbial additives.
• the opaque, tinted, biaxially oriented and partially crystalline wrapping film according to the German patent application 10105110 is from 100 to 500 microns thick and contains 2,4,4 '-trichloride-2'-hydroxy-difenylether (Triclosan), or other anti-microbial substances as anti-microbial additives.
• the single or multi-layer, transparent, biaxially oriented anti-microbial film for wrapping and medical application according to a German patent application 10105108 - also contains 2,4,4 , -trichloride-2'-hydroxy-difenylether as an anti-microbial additive.
• amorphous transparent, or coloured films 30 - 1,000 microns according to a series of German patent applications 10101902, 10101903, 10101904, 10101906 and a white film saturated with barium sulphate according to a German patent application 10100704 and 0100705 contain the same anti-microbial additive.
• the polyester wrapping film according to a Japanese patent application 10330603 contains 0.1 - 3 % of anti-microbial additive based on a combination of metal oxides (Zn, Cu, Mg, Ca).
• a hygienic wrapping film with an anti-microbial treatment of the outer surface according to the invention contributes to elimination of the mentioned shortcoming.
• This hygienic wrapping film comprises a basic surface structure based on a single or multilayer polymer film covered with a single or multi-layer of print, out of which at least one layer contains an anti-microbial agent and the thickness of the layer with anti-microbial activity does not exceed 0.01 mm.
• the anti-bacterial agent of the surface print layer can be a substance containing silver ions or a substance containing volatile oils of selected natural substances such as thyme, oregano, cinnamon, clove, rosemary or fennel.
• the polymer material of the basic film is selected from a group of polyolefins, mainly PE and PP, their copolymers, mainly ethyl vinyl acetate, ethyl methacrylate, ethyl butyl acrylate and ionomer, biopolymers, mainly polylactic acid (PLA) and modified starches.
• PE and PP polyolefins
• PLA polylactic acid
• the production process of making the hygienic wrapping film with an anti-microbial treatment of the outer surface initially involves a standard plastic making process, such as rolling or blowing, which produces a polymer film of a basic flat structure.
• the invention is based on printing of a polymer film with a single or multiple layer on one side; at least one of these layers weighs 4-8 g/m and 1-5 g/m of dry matter contains an anti-microbial agent. From thus treated film, a wrapping film is produced in a tailor-making process where the layer containing the anti-microbial agent forms its outer layer.
• the benefit of the hygienic wrapping film with an anti-microbial treatment and the manufacturing method according to the invention lies in a reliable, long-lasting anti-microbial effect of a wrapped product that can pass through many hands without a danger of infection.
• the thickness of the active anti-microbial layer produced by printing is small - up to 0.01 mm, but in practice usually 0.001 - 0.002 mm, the wrapping is easily recyclable throughout its lifetime. Creation of the active surface with a print ensures that only the surface of the wrapped area is active, not the flaps or the inner surface.
• a layer of printing varnish containing 10 % of volatile oils from thyme, 25 % of carrier substance made with micro- ground lime, 5 % of bonding compound and 60 % of thinners (85% ethanol, 15% ethyl acetate) is applied by flexography in a deposit of 7.5 g, after drying 3 g of dry matter/m 2 , which corresponds to the thickness of the anti-bacterial layer 0.002 mm. From thus treated film, a hygienic wrapping film is produced in a tailor-making process where the layer containing the anti-microbial agent forms its outer layer.
• the base comprises a double-layer film with an A/B structure of the total thickness 0.050 mm and the ratio between layers 4:1; the face side of the future outer surface of the wrapping film contains 100 % of polypropylene (PP) with the density of 900 kg/m 3 and the B layer (a weld layer) contains 100 polyethylene (PE) with the density of 918 kg/m 3 .
• PP polypropylene
• PE polyethylene
• a layer of printing varnish composed of 10 % of volatile oils from thyme, 25 % of carrier substance made of micro-ground lime, 5 % of bonding compound and 60 % of thinners (85% ethanol, 15% ethyl acetate) is applied to the outer surface by flexography in a deposit of 7.5 g (3 g of dry matter/m 2 after drying), which corresponds to the final thickness of the anti-bacterial layer 0.002 mm. From thus treated film, a hygienic wrapping film is produced in a tailor-making process where the layer containing the anti-microbial agent forms its outer layer.
• the base comprises a double-layer film with an A/B structure; the total thickness is 0.050 mm and the ratio between layers is 4:1; the face side of the future outer surface of the wrapping film contains 100 % of polypropylene (PP) with the density of 900 kg/m 3 and the B layer (the weld layer) contains 100 % of copolymer ethylene vinyl acetate (EVA) with the content of vinyl acetate 18 % and a density of 950 kg/m 3 .
• PP polypropylene
• EVA copolymer ethylene vinyl acetate
• a layer of printing varnish composed of 10 % of volatile oils from thyme, 25 % of carrier substance made of micro- ground lime, 5 % of bonding compound and 60 % of thinners (85% ethanol, 15% ethyl acetate) is applied to the outer surface by flexography in a deposit of 7.5 g (3 g of dry matter/m 2 after drying), which corresponds to the final thickness of the anti-bacterial layer 0.002 mm. From thus treated film, a hygienic wrapping is produced in a tailor-making process where the layer containing the anti-microbial agent forms its outer layer.
• the base comprises a double-layer film with an A B structure; the total thickness is 0.050 mm and the ratio between layers is 4:1, where the face side of the future outer surface of the wrapping film contains 100 % of polypropylene (PP) with the density of 900 kg/m 3 and the B layer (the weld layer) contains 100 % of copolymer ethyl methyl acrylate (EMA) with the content of methyl acrylate 17 % and density 960 kg/m 3 .
• PP polypropylene
• EMA copolymer ethyl methyl acrylate
• a layer of printing varnish composed of 10 % of volatile oils from thyme, 25 % of carrier substance made of micro- ground lime, 5 % of bonding compound and 60 % of thinners (85% ethanol, 15% ethyl acetate) is applied to the outer surface by flexography in a deposit of 7.5 g (3 g of dry matter/m after drying), which corresponds to the final thickness of the anti-bacterial layer 0.002 mm. From thus treated film, a hygienic wrapping is produced in a tailor-making process where the layer containing the anti-microbial agent forms its outer layer.
• Example 5 A single-layer film 0.060 mm thick made from PLA polymer (polylactic acid) with the density of 1,400 kg m3 has a flexographically applied layer of printing varnish containing 10 % of volatile oils from oregano, 25 % of a carrier substance made of micro-ground lime, 5 % of bonding substance and 60 % of a thinning mixture (85 % of ethanol, 15 % of ethyl acetate) in a deposit of 7.5 g (3 g of dry matter/m after drying), which corresponds to the final thickness of the anti-microbial layer 0.002 mm. From thus treated film, a hygienic wrapping is produced in a tailor-making process where the layer containing the anti-microbial agent forms its outer layer.
• a single-layer film 0.040 mm thick made from polyethylene (PE) with the density of 918 kg/m 3 has a flexographically applied layer of printing varnish containing 5 % silver zeolite, 5 % of a bonding substance and 90 % or thinning mixture (5 % of ethanol, 15 % of ethyl acetate) in a deposit of 3 g (2.7 g of dry matter/m after drying), which corresponds to the final thickness of anti-microbial layer 0.001 mm. From thus treated film, a hygienic wrapping is produced in a tailor-making process where the layer containing the anti-microbial agent forms its outer layer.
• PE polyethylene
• a double-layer film with an A/B structure the total thickness is 0.050 mm and the ratio between the layers is 4:1; the face side of the future outer surface of the wrapping film contains 100 % of polypropylene (PP) with the density of 900 kg/m 3 and the B layer (the weld layer) contains 100 % of polyethylene (PE) with the density of 918 kg/m 3 .
• a layer of printing varnish composed of 5 % of silver zeolite, 5 % of bonding compound and 90 % of thinners (5% ethanol, 15% ethyl acetate) is applied to the outer surface by flexography in a deposit of 3 g (2.7 g of dry matter/m after drying), which corresponds to the final thickness of the antibacterial layer 0.001 mm. From thus treated film, a hygienic wrapping is produced in a tailor- making process where the layer containing the anti-microbial agent forms its outer layer.

Landscapes

• Wrappers (AREA)
• Laminated Bodies (AREA)

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Citations (17)

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• 2011
  • 2011-01-26 CZ CZ20110035A patent/CZ303531B6/cs unknown
• 2012
  • 2012-01-25 WO PCT/CZ2012/000009 patent/WO2012100760A1/en not_active Ceased

Patent Citations (17)

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