CN100378148C - Film having a liquid absorbed therein - Google Patents
Film having a liquid absorbed therein Download PDFInfo
- Publication number
- CN100378148C CN100378148C CNB2004800068511A CN200480006851A CN100378148C CN 100378148 C CN100378148 C CN 100378148C CN B2004800068511 A CNB2004800068511 A CN B2004800068511A CN 200480006851 A CN200480006851 A CN 200480006851A CN 100378148 C CN100378148 C CN 100378148C
- Authority
- CN
- China
- Prior art keywords
- film
- liquid
- food
- layer
- casing
- 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 - Fee Related
Links
- 239000007788 liquid Substances 0.000 title claims description 79
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- 239000000463 material Substances 0.000 claims description 89
- 238000000034 method Methods 0.000 claims description 68
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
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- 238000000354 decomposition reaction Methods 0.000 description 3
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- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 2
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- 239000004698 Polyethylene Substances 0.000 description 2
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- 231100000987 absorbed dose Toxicity 0.000 description 2
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- LDVVTQMJQSCDMK-UHFFFAOYSA-N 1,3-dihydroxypropan-2-yl formate Chemical compound OCC(CO)OC=O LDVVTQMJQSCDMK-UHFFFAOYSA-N 0.000 description 1
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 1
- CODAYFPFZXWNLD-UHFFFAOYSA-N 2-hydroxypropanoyl octadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OC(=O)C(C)O CODAYFPFZXWNLD-UHFFFAOYSA-N 0.000 description 1
- MIDXCONKKJTLDX-UHFFFAOYSA-N 3,5-dimethylcyclopentane-1,2-dione Chemical compound CC1CC(C)C(=O)C1=O MIDXCONKKJTLDX-UHFFFAOYSA-N 0.000 description 1
- 229920001817 Agar Polymers 0.000 description 1
- GUBGYTABKSRVRQ-XLOQQCSPSA-N Alpha-Lactose Chemical compound O[C@@H]1[C@@H](O)[C@@H](O)[C@@H](CO)O[C@H]1O[C@@H]1[C@@H](CO)O[C@H](O)[C@H](O)[C@H]1O GUBGYTABKSRVRQ-XLOQQCSPSA-N 0.000 description 1
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- 241000335053 Beta vulgaris Species 0.000 description 1
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- HMFHBZSHGGEWLO-SOOFDHNKSA-N D-ribofuranose Chemical compound OC[C@H]1OC(O)[C@H](O)[C@@H]1O HMFHBZSHGGEWLO-SOOFDHNKSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 229930091371 Fructose Natural products 0.000 description 1
- 239000005715 Fructose Substances 0.000 description 1
- RFSUNEUAIZKAJO-ARQDHWQXSA-N Fructose Chemical compound OC[C@H]1O[C@](O)(CO)[C@@H](O)[C@@H]1O RFSUNEUAIZKAJO-ARQDHWQXSA-N 0.000 description 1
- 108010010803 Gelatin Proteins 0.000 description 1
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
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- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 description 1
- 239000004141 Sodium laurylsulphate Substances 0.000 description 1
- HVUMOYIDDBPOLL-XWVZOOPGSA-N Sorbitan monostearate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O HVUMOYIDDBPOLL-XWVZOOPGSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- LCJHLOJKAAQLQW-UHFFFAOYSA-N acetic acid;ethane Chemical compound CC.CC(O)=O LCJHLOJKAAQLQW-UHFFFAOYSA-N 0.000 description 1
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- 235000021485 packed food Nutrition 0.000 description 1
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- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 description 1
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- HQHCYKULIHKCEB-UHFFFAOYSA-N tetradecanedioic acid Chemical compound OC(=O)CCCCCCCCCCCCC(O)=O HQHCYKULIHKCEB-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/90—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in food processing or handling, e.g. food conservation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
Landscapes
- Laminated Bodies (AREA)
- Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
- Packages (AREA)
- General Preparation And Processing Of Foods (AREA)
Abstract
A coating composition for application to a food packaging film is disclosed. The resulting film can be used as a tubular food casing that, after cooking or heating, imparts a brown color to a foodstuff encased in the casing. The composition comprises 20-47% of a browning agent, 0.05-2% of a viscosity-modifying agent, optionally surfactant, polyol or a pharmaceutically acceptable salt and has a pH of 2 to 6.5.
Description
The cross-reference of related application
The application requires rights and interests U.S. Provisional Patent Application 60/501,339 and the U.S. Provisional Patent Application 60/454,444 that on March 13rd, 2003 submitted to of submission on September 8th, 2003.
Technical field
The present invention relates to a kind of film, this film has the surface of carry liquid, and this liquid is absorbed partly in the described surface at least.Particularly, the present invention relates to a kind of film that is used as the packing of food, relate in particular to a kind of tubular food casing that is used for food, described food will cook in described casing or heat.
Background technology
Below will be especially by introducing the present invention with reference to a kind of film that is used for wrap food.But should be appreciated that film of the present invention can also be applied, and therefore is not limited to food service industry beyond food service industry.
Comprising the goods that the surface is absorbed with the material of liquid has a wide range of applications.These application comprise " paster (patches) " of the slowly-releasing topical that is used for the treatment of agent and are used for seasonings and/or tinting material are discharged into the food casings of the food of its packaging.Yet the kind that can be used in the material that forms these goods is strictly limited to those required liquid is had suitable absorptivity or infiltrative material.
In practice, this has seriously limited the kind of operable material.Usually, for hydrophilic liquid, used material is a cellulose materials and such as the derivative or the modified product of water-soluble polymerss such as polyacrylamide, polyvinyl alcohol and polyvinylpyrrolidone.Usually these materials are carried out modification, make that the goods that formed by these materials no longer are water miscible, but also can absorb some moisture at least.These polymkeric substance can with low wetting ability and/or hydrophobic polymkeric substance or monomer crosslinked and/or blend or copolymerization.A special applications that is absorbed with the film of liquid is at cellulosic food casings, and this cellulosic food casings is absorbed with the seasonings of smoking that is known as " Fumeol ".This casing has been developed to and the taste and/or the color of smoking can be applied in the food, to replace traditional fumigating method.
Traditional smoking process to prepare relates to be inserted food to be smoked (for example sausage) in the casing of permeable cigarette, and the food through filling is suspended in the smokehouse, makes the timber low-temperature burning to produce smog in this smokehouse.Smoke big, the consuming time length of labor capacity (time of smoking is a few days) with this conventional art, and levels of smoke production is often violated environmental regulation.
For the advantage that smoked product has being provided and overcoming the shortcoming that tradition is smoked technology, developed Fumeol before about 65 years.Fumeol is the water-based phlegma of natural timber smog, wherein contains aldehydes, and the proteins react in described aldehyde and the meat makes the meat surface that brown stain take place.This brown stain can provide the outward appearance of natural smoked product.
Meat product being put into before baking box cooks, at first Fumeol is sprayed on the meat product that is packaged in porous natural intestine or the cellulose casing.The porousness of casing makes Fumeol can penetrate this casing and enters in the meat.Yet find that in practice this spray processing is difficult to provide uniform coating to food.In addition, the Fumeol that is sprayed flows down along the side of the casing through filling easily, and accumulates in it than low side.The inhomogeneous coating of this Fumeol can cause product to have unfavorable speckled appearance.
In view of these difficulties, carried out extensive work, on food surfaces so that equally distributed Fumeol to be provided.Carried out some Fumeol has been joined trial in the meat product itself.Yet this or the quantity not sufficient that makes medicament on food surfaces to be providing the ideal color, or make the smoke of product overweight.
A kind of relatively successful method is to join Fumeol in the cellulose casing or Fumeol is absorbed on the surface of cellulose casing.The lip-deep technology that Fumeol is absorbed cellulose casing comprises with Fumeol solution impregnation cellulose casing, or with the Fumeol spray solution to cellulose casing so that Fumeol infiltrates into internal surface, thereby finally transfer in the product of its packaging.This external treatment can be brought difficulty in the further processing of cellulose casing, particularly may disturb shirred (shirring).Although there are these difficulties, the cellulose casing of much handling through Fumeol is arranged on the market.
The perviousness of cellulose casing and porousness make it be used with Fumeol on the one hand, have then introduced the serious shortcoming of generally acknowledging on the other hand.At first, cellulose prods is the height permeability for water vapour.The corresponding minimizing of gross weight that this can cause in the process of cooking loss moisture and make product.This can cause product yield to descend, this commercial be disadvantageous.In addition, cellulose casing still is an oxygen permeable, and this can cause food spoilage and/or variable color.This difficulty of back makes that the food of cooking must be edible in a short time after cooking in cellulose casing, perhaps take out from casing as early as possible after production and carry out secondary package with shielding casing that can not permeated oxygen.Packaging step provides food contaminated or infected chance once more, this means the decline of quality and the shortening of shelf life.In addition, additional step has also increased cost.
In order to overcome the shortcoming of permeability cellulose casing, having developed can not infiltration water and the thermoplasticity casing of oxygen.When using such casing, in process for processing or the weight loss in storage and the transportation be negligible.In addition, if casing is kept perfectly, then product can keep aseptic.But because the impermeability of casing, gas form still is that the cigarette of liquid form all can't pass this casing.In addition, because employed plastics can not suitably absorb and store soaker, the result can't be with Fumeol or other color additive heat of immersion plasticity casing.In order to smoke color to providing with plastics packed food, just must remove this casing, and use such as technology such as sprinkling or dipping Fumeol or atomizings and smoke, then product is packed once more.These additional steps have not only increased cost, have also increased the contaminated risk of food.
Another kind method provides a kind of Mierocrystalline cellulose/plastic laminating material, is absorbed with tinting material in the cellulose layer of inside, and plastics then are used to provide the oxygen screen layer.When meat was cooked in the packing of being made by this material, juice accumulated between meat and the packing but in practice.This situation is called " cooking out (cook-out) " or releases (purge).This is unfavorable from human consumer's acceptable angle.In addition, also observe in the slicing processes, chip is peeled off or produces on the meat surface of being cooked easily.
On the industry common recognition need a kind of be absorbed with foodstuff additive (for example Fumeol) can not penetration air and the casing of steam.Yet all are attempted to address this problem and attempt to provide the trial of commercial acceptable product all to fail because of various reasons up to now.A kind of method is with Fumeol and the resin alloy that is used as the plastic casing internal layer.Owing to this method of multiple reason is not achieved success, these reasons are included under the extrusion temperature Fumeol and react and volatilize, and owing to the existence of additive causes this layers of material.
Another kind method is that the absorptivity additive is joined in the plastic casing material of impermeability.Yet this product is not used as yet commercial at present.The inventor is to a kind of such test shows that material carried out, and the liquid that is absorbed into film is still not enough, and too much liquid still is retained on the surface of film.
If do not remove these too much liquid, in processing (for example shirred and filling) process subsequently, tinting material and odor control additive can't keep being evenly distributed in film surface.Make color and taste transfer to the surface of product unevenly.
If wipe too much liquid, then almost few of tinting material and odor control additive are absorbed by membrane structure, and few even do not have color and taste to transfer to product surface.
If casing is smooth sheet, then can removes too much liquid with evaporate to dryness steam, thereby on film surface, stay tinting material and odor control additive as coating by heating.But,, then be difficult to maybe can't heat if this film is a heat-schrinkable film.This casing can be formed tubulose with wrap food then.Need accurate balance,, can in the course of processing, be discharged into the surface of food again so that both be enough to stand shirred and stuffing operation attached to the coating on the surface of casing.
If casing is a piped, then can be by the well-known technology that is called lavage (slugging), the liquid that will contain tinting material and seasoning agents soln adds in the pipe, but does not have the practical approach that excess liq is removed.Therefore, can't add enough seasonings and tinting materials of transferring to equably on the food surfaces.
Should be appreciated that in using, use in the application of the material that wherein partially absorbs liquid at least, also wish to provide the surrogate of presently used those materials at needs with irrelevant other of foodstuffs industry.Therefore the purpose of this invention is to provide film that is absorbed with partially liq at least and the method for producing this film, described film can partly overcome above-mentioned shortcoming at least, perhaps provide usefulness for the public or coml select.
Summary of the invention
A kind of film is provided in a first aspect of the present invention, this film has the surface of carry liquid, this liquid is absorbed in the described surface at least in part, wherein, before liquid is applied to the surface, surface activation process has been carried out on described surface, made its surface activity be at least about 50 dyne.
The present invention relates to an amazing and unexpected discovery, promptly carry out surface activation process by the surface to film, this surface can apply with liquid level, makes this liquor be absorbed at least in part in the described film.
" absorb in the surface at least in part " and should be understood to and be retained in lip-deep coating and compare at least some liquid infiltrations in the surface.
Another aspect of the present invention provides a kind of method for preparing film, this film has the surface of carry liquid, this liquid is absorbed in the described surface at least in part, this method may further comprise the steps: surface activation process is carried out on the surface to this film, makes its surface have the surface energy that is at least about 50 dyne; Apply liquid to this surface, make this liquid be absorbed in the film at least in part.
Film of the present invention can be the employed any suitable film of end-use.Preferred this film is used for wrap food.More preferably this film is a kind of film of cooking (cook-in) in packing.Described film is made by one or more polymeric materials, is one or more layers.Polymeric material can be any suitable material that can be processed to the film of single layer structure or multilayered structure.Polymeric material can be synthetic or nonsynthetic polymkeric substance or its mixture or blend.The employed suitable material of multilayer film that is used for the food product pack purposes comprises a Food Contact layer and one or more other layer, and described other layer is selected from sealing ply, anti-misuse layer (abuse layer), body layer, oxygen screen layer, steam screen layer, laminated film tack coat etc.The character of these extra plays does not constitute a part of the present invention.Those of ordinary skill in the art knows employed suitable polymers and blend thereof in the structure food product packing film.Typical material as known in the art comprises polyolefine material, as new LDPE (film grade), linear low density polyethylene, high density polyethylene(HDPE) and high ' alpha ' olefin, as polypropylene, polybutene; The olefin copolymer of ionomer resin, vinyl monomer is as ethane-acetic acid ethyenyl ester, ethylene-acrylic acid or its blend; Polyvinyl chloride, polyvinylidene dichloride, polystyrene and blend thereof and/or its multipolymer.
The particularly preferred material that is used for surface activation process is a water wetted material, for example polyamide material.In the food product pack field, suitable polymeric amide is known, comprise fatty polyamide, for example particularly contain the aliphatics primary diamines of 4 to 8 carbon atoms and the homopolymerization polycondensate (homopolycondensate) that particularly has the aliphatic dicarboxylic acid of 4 to 10 carbon atoms, and blend or mixture.The aliphatics copolyamide can be same homopolymerization polycondensate or homopolymer, can be based on the polymkeric substance of one or more aliphatie diamines and one or more aliphatic dicarboxylic acids and/or one or more omega-amino acid or omega-amino acid lactan.The example of suitable dicarboxylic acid comprises hexanodioic acid, nonane diacid, sebacic acid and tetradecane dicarboxylic acid.Film can also comprise additive, to promote adhering to or absorbing of liquid.Suitable additive can comprise water-soluble or water-swellable material, for example starch, Mierocrystalline cellulose (comprising chemical cellulose), polyethylene oxide, polyvinyl alcohol, polycyclic acid, crosslinked polyvinylpyrrolidone (PVPP) and polyvinylpyrrolidone (PVP) multipolymer and composition thereof or blend.Preferable material is PVP or PVPP.
Can also handle to increase its surface-area film surface.These surface treatment methods are known, comprise ablating and etching.Alternatively, can make surface roughening in extrusion by many methods, these methods comprise by the roughening mould extrudes or sets temperature of fusion and die temperature to produce uneven flowing or turbulent flow.Alternatively, can and can promote melt fracture or change the blend of mobile additive polymkeric substance.On the other hand, in some cases, can add processing aid with the control melt fracture.Can reduce or change the amount of these auxiliary agents that added, to obtain ideal effect.
In some application such as for example food product pack, film is a heat-shrinkable, makes to form the packing that closely is complementary with food.This film can be the film of cooking in packing, and this film can shrink in the process of cooking in the case.Alternatively, can film be shunk before wrap food by packing is placed in the environment of heating.
Typically, in order to be used for food product pack, this film is seamless tubulose casing.Can prepare this casing with method as known in the art.Alternatively, film can be made monolithic, activating surface, coating, then by the edge being sealed together to form pipe.By sealing the method that monolithic is made pipe is well-known in the art, and is called the back of the body and meets (back seaming).This method is used on shaper or filling machine.
Surface activation process can adopt any suitable treatment process, for example plasma, flame, corona discharge, UV-irradiation, electron beam irradiation and gamma-radiation etc.Also can be by chemical treatment being carried out on the surface with oxygenant or etching reagent.Preferably be treated to corona discharge.
Known and to have handled polyolefine material with corona discharge, to improve its surperficial wetting properties, so that printing.Usually polyolefine is handled, so that its surface energy is brought up to 37～40 dyne at the most from about 30～32 dyne.The character of all additives that provide the required power level of this dyne value growth to depend on the character of pending material to a certain extent and wherein comprise.The material difference, then reaction is also inequality.For example, known polyester needs relatively low power level, promptly from about 8W-m/M
2(the watt-minute clock/square metre) to 11W-m/M
2Polypropylene then needs the relatively power level of " height ", promptly from about 22W-m/M
2To 27W-m/M
2Because higher corona treatment degree will cause polymer surfaces to puncture, and discharge low molecular weight product, therefore the binding ability that in fact this reduced materials such as surface and printing ink it is believed that higher corona treatment degree is unfavorable.
Also is known by corona discharge to the processing that the polyolefin layer that forms the tubular food casing internal surface carries out.The purpose of this processing is in order to improve the adhesion property of surface to meat.Usually polyethylene is handled, made the surface energy of film bring up between about 40 dyne to 50 dyne.Tack to a certain degree to meat is an ideal, releases avoiding.But excessively tack also is disadvantageous, and this is because film can not be fitly and the meat surface isolation, can only pull out part meat from film.This causes producing the indecency outward appearance of scar shape.When the surfactivity of film surpasses about 50 dyne, can observe excessively usually and adhere to.The corona treatment of tubulose casing internal surface is introduced in US5296170.The polymeric amide enteric materials that surface energy is about 45 dyne at the most has enough meat adhesion properties usually, and does not need corona treatment.It is believed that then the film of gained will be exceedingly attached to the meat surface if polymeric amide is carried out corona treatment, thereby cause the problems referred to above.
The contriver is surprised to find that, when the corona treatment degree being brought up to considerably beyond known commercial degree, liquid is absorbed in the film.And when film was the packing articles of the food of cooking in packing, described film can be exceedingly attached to the meat surface.
Should be appreciated that it is different that the surface-treated degree is carried out on the surface, this depends on the character, surface activating process of matrix and the amount of liquid to be absorbed.For special matrix, its required degree of treatment will be determined by those skilled in that art.Typically, the surface is handled, be at least about 0.40mg/cm so that absorbed dose to be provided
2To 10mg/cm
2Coating, preferably be at least about 1.0mg/cm
2To 3.0mg/cm
2When the surface being handled, usually with about 50watt/min/m by corona treatment
2To 1000watt/min/m
2Power density the surface is handled, be most preferably 100watt/min/m
2To 600watt/min/m
2Can handle with one or more groups placed in-line electrode pair film.Overall power density is distributed between electrode as required.
Liquid can be any suitable liquid that depends on required end-use.Be to be understood that term liquid is meant any flowable materials, comprise neat liquid, water-based or non-aqueous mixtures, suspension, emulsion, solution and composition, it can contain or not contain such as the solids such as particulate matter that suspend.
Usually, liquid contains additive, this additive can change the character of film and/or can be transferred to goods that film contacts in.For example, in therapeutic was used, additive can be a therapeutical agent, for example medicine, VITAMIN or conditioning agent etc.
When film was used for food product pack, liquid comprised tinting material and/or seasonings usually, and optional additive, for example tackiness agent, jelling agent or thickening material and tensio-active agent etc.Preferably, in order to cook in packing, tinting material is a based colorant that can react by the protein in Maillard reaction (Maillardreaction) and the food, and this reaction produces smokes the peculiar brown of meat.Maillard reaction can also be given the taste that food is smoked.U.S. rad reagent both can be thought tinting material, also can think seasonings.Compound with proteins react is such as glycollic aldehyde isoreactivity carbonyl compound with such as reducing sugars such as fructose, glucose, ribose, lactose, wood sugars by this way.In this manual, common name " Mei Lade reagent " is used to refer to any or multiple in this compounds.Preferred Mei Lade type tinting material is the tinting material that Fumeol maybe can be called Maillose from the commodity that RedArrow obtains.Maillose reagent is by carbohydrate and starch pyrolytic decomposition and form.Fumeol is the collection condensed product of timber or Mierocrystalline cellulose pyrolytic decomposition.Fumeol comprises usually with the active carbonyl compound of glycollic aldehyde as main carbonyl product.Particularly preferred tinting material is that those comprise the tinting material that concentrates the Mei Lade reagent of amount relatively.Particularly preferred tinting material comprises the glycollic aldehyde of about 20 weight % to 40 weight %, and most preferred tinting material comprises the glycollic aldehyde of about 30 weight % to 35 weight %.
Can use other tinting material to substitute Maillose type tinting material, or replenishing as Maillose type tinting material.These other tinting material is well known in the art, and comprises caramel, beet extract, Fructus Hordei Germinatus He dioxin (bioxin).
Particularly preferred composition is the present composition of developing of Red Arrow company.These compositions comprise at least a viscosity modifier, tensio-active agent and Mei Lade type tinting material.Be applicable to the contacted viscosity modifier of food be well-known in the art, comprise following material: Mierocrystalline cellulose, methylcellulose gum, hydroxypropylcellulose, starch, chitin, carrageenin, konjaku, guar gum, xanthan gum, alginic acid and derivative thereof, agar, pectin and gelatin etc.Preferred viscosity modifier is a water-soluble cellulose ether, for example methylcellulose gum, Vltra tears, hydroxypropylcellulose, ethylmethylcellulose, Natvosol, Type 3U, and preferred anionic water-soluble cellulose ether, for example carboxymethyl cellulose and carboxymethyl hydroxyethyl cellulose.Also can use the mixture of water-soluble cellulose ether.Particularly preferred ether of cellulose is the methyl cellulose ether of commodity Methocel by name.Usually, said composition comprises the highest viscosity modifier that is about 2.0 weight %, preferably comprises the highest viscosity modifier that is about 1.0 weight %.
Preferred compositions comprises the viscosity modifier of about 0.05 weight % to 0.5 weight %, most preferably comprises the viscosity modifier of about 0.125 weight % to 0.25 weight %.
Composition comprises one or more tensio-active agents usually.Suitable tensio-active agent comprises CSL, triglyceride, aerosol OT, hydroxypropylcellulose, Yelkin TTS, monoglyceride, polysorbate60,65 and 80, such as glycol such as propylene glycol, Sodium hexametaphosphate 99, sodium lauryl sulphate, stearoyl lactate, sorbitan monostearate, or their mixture.
Particularly preferred composition comprises the Mei Lade type tinting material that combines with methylcellulose gum and glycol (as propylene glycol), the highest 10 weight % that are about of preferred diol content, the more preferably the highest 5 weight % that are about.
Composition can optionally comprise other additive, for example oxidation inhibitor or stablizer.
Should be appreciated that the kind of composition of liquid composition and content can according to the character on surface and wherein the food of packaging select.Should consider needed color of various meat products or taste from the acceptable angle of human consumer.
Alternatively, or except tinting material or seasonings, this liquid can comprise biocide, antiseptic-germicide, mycocide and/or antiviral agent.The adding that is to be understood that these reagent is not limited in the food product pack, can also have other application.
This liquid can also mainly be made up of water.The inventor unexpectedly observes when handling very hard usually film with method of the present invention, and film can absorb the moisture of capacity, thereby changes the physical properties of film, makes film become soft and pliable and tough.Softer film can be applied in the food product pack industry, wherein earlier food is filled in the tubulose casing, then it is placed into cross section and is generally in square or the orthogonal metal die.The food of packing and cooking with this method is called molded food product.The flexibility of film makes that this film can be consistent with the shape of mould.On the other hand, for waiting some to use, need to use have low flexible film such as weighting material (wherein food is injected the tubulose casing and cook, so that the food with rounded section to be provided).
Design to provide two-layer at least by the control amount of liquid that film absorbed and/or to film, the first layer is in order to absorb liquid, and another layer then is water impermeable barrier or waterproof layer, can control or change degree of flexibility.Should be appreciated that this film can also comprise other layer.An example of this scheme is the film that is used for food packaging film, the internal layer of this film possess hydrophilic property material (for example polyamide material) and polyolefine material (for example polypropylene, polyethylene or LLDPE) layer.
Can be by such as soaking or any suitable technology such as sprinkling is applied to the surface with liquid.For the tubulose casing, appropriate method as known in the art is a lavage.Among the US3378379 lavage is described, and with lavage coating is applied to and has in the absorbefacient cellulose casing.The traditional lavage that is used to be coated with the casing inboard relates to coating material filling part casing, make " irrigating solution (slug) " of material be present in bottom usually by casing formed " U " shape, one of successive indefinite length joint on the mobile then casing, make when the irrigating solution of coating material remains in the casing, make casing move through irrigating solution, and the coating material that the inwall of described casing is comprised in the irrigating solution is coated with.Film is passed a pair of the wheel between discaling roll.
Preferably, improved lavage technology can be used for applying liquid to the surface, irrigating solution is trapped between breaker roll and the following breaker roll in described technology.Last group of roller preferably includes chrome-plated roller and rubber rollers.The hardness of rubber rollers is about 60 to 120 usually, especially between 70 to 100.When pipe passed between two groups of rollers, liquid was managed entrained, on organize the effect that roller plays metering roll.In embodiments of the invention, when mainly containing water, comprise tackifier in the preferably water.The increase of viscosity be convenient to liquid lead to the group roller.
Preferably roll gap is set at thickness less than pipe, be about usually pipe thickness 50%.These are different with traditional coating technique, and the thickness that roll gap equals pipe in traditional coating technique adds required coat-thickness.Though do not wish to be bound by theory, it is believed that when pipe between roller through out-of-date, the pressure that is produced helps lend some impetus to liquid and enters in the membrane wall.Usually absorbed dose is between 20 weight % to 35 weight %.
The food casings of being made by film of the present invention can provide with any form as known in the art, for example through the discontinuous pipe nipple of shirred casing rod, flat casing, be positioned at the continuous segment of the flat casing on the spool etc.
When film is tubulose casing form, after applying liquid, carry out shirred usually to pipe.Can be undertaken shirred by the shirred technology of tradition well known by persons skilled in the art.
According to another aspect of the present invention, provide a kind of through shirred tubular food casing, this food casings has the inside food contact surface that is coated with liquid composition, described liquid composition comprises at least a wherein foodstuff additive of the food of packaging that are used for being transferred to, wherein, before described composition is applied to described surface, surface activation process has been carried out on described surface.
After applying liquid, can this film be used for wrap food by any appropriate means.When packing is a tubulose casing form or during through shirred casing form, can meat product be pushed in the tubulose casing by stuffing horn and fill casing.
Can use any appropriate means (for example boil, steam heating or be placed in the baking box) to cook the food that is packaged in the film of the present invention.Preferably after packing, cook wrap food as early as possible.Alternatively, can carry out pre-heating step, so that cooking preceding constant color to wrap food.For example, wrap food can be preheated to the temperature of about 150 , be heated to many about 6 minutes to about 200 .Cook in the process, food colorant will be given color for food surfaces.
According to another kind of form of the present invention, a kind of method of processed food is provided, this method comprises in the film that packages foods in first aspect of the present invention, comprise tinting material in this film, will be heated to from the color of tinting material through the goods of packing then and can transfer to temperature on the food surfaces.
Description of drawings
Fig. 1 has shown the photo that is packaged in the ham in the film of the present invention of comparing with the contrast ham;
Fig. 2 has shown the photo that is packaged in the turkey product in the film of the present invention of comparing with the contrast turkey;
Fig. 3 has shown the electron scanning micrograph of the film of called after DC-1-AD-1;
Fig. 4 has shown the electron scanning micrograph with the film of Fig. 3 of coloured composition dipping;
Fig. 5 has shown the electron scanning micrograph of the film of Fig. 3 after with methanol extraction; With
Fig. 6 has shown the electron scanning micrograph of the film of Fig. 4 after with methanol extraction.
Embodiment
Embodiment 1-coating agent
Coating agent is prepared according to table 1 by Red Arrow.
Table 1
| Be coated with layer identification code | The coating moiety | Weight % |
| C/C 3/02/C 1/03 | Maillose 45 1. propylene glycol dioctyl sulphosuccinate xanthan gum | 94.63 5.00 0.25 0.12 |
| C x | Fumeol 3. | 100.0 |
| C 7 | Maillose 45 propylene glycol Methocel 2 SGA16M | 94.875 5.00 0.125 |
| C 9 | Fumeol propylene glycol Methocel SGA16M | 94.875 5.00 0.125 |
| C 20 | Maillose 45 propylene glycol Methocel K 100M | 98.4 1.4 0.2 |
| C 21 | Fumeol propylene glycol Methocel K 100M | 98.4 1.4 0.2 |
1.Maillose 45 comprise 27 weight % glycollic aldehydes, are a kind of tinting materials that obtains from the Arrow Products Co.LLC of Manitowoc, the state of Wisconsin, are formed by the carbohydrate pyrolytic decomposition.
2.Methocel be the methylcellulose gum that obtains from Dow.
3. Fumeol is the concentrated Fumeol product that comprises about 30 weight % to 35 weight % glycollic aldehydes, from the Arrow Products Co.LLC acquisition of Manitowoc, the state of Wisconsin.
The corona treatment of embodiment 2-polyamide layer
Carry out following experiment with three-layer type heat-shrinkable tubular film, this three-layer type heat-shrinkable tubular film has outer polyamide layer, polypropylene copolymer middle layer and polymeric amide internal layer.Internal layer is the blend of the PVPP of nylon 6 and about 16%.Hereinafter this film is called DC-1.
With to arrangement of electrodes similar described in the US5296170, under 600W, tubular film is carried out inner corona treatment, wherein, an electrode in the pair of electrodes is contacted with a side of inflated pipe.In pipe, produce corona discharge in the gas space in this way.But the important difference of method described in this programme and the US5296170 is to have used in this programme higher power level.Though US5296170 power density of no use is described power level, embodiment shows that the dyne value of polypropylene film is to increase to 42 dyne and 41 dyne from 31 dyne.Yet can estimate used power from the variation of this dyne value is about 18 watts to 23 watts.After the corona treatment, the film internal surface is coated with by lavage as described below.
1. will manage incision, add a certain amount of " irrigating solution ".
2. injection air, it is cylindrical that pipe is become, blended rubber band sealing cut.
3. this pipe is advanced and part by one group of coating roll with subsiding.Described roller comprises that hardness is 72 rubber rollers and chrome-plated roller.Spacing between coating roll is adjustable, and it is wide by 50% to make that the not driving fit fully of described roller, its gap are about pipe.When the film that carries liquid passed through described roller, most of liquid was extruded.
4. the film that then internal surface is absorbed with liquid is wrapped on the spool.
Degree of surface activation is estimated by the dyne value of surface measurements energy.The results are summarized in the table 2.
Table 2
| Corona treatment | The dyne value | Watt-min/m 2 | Additional content * mg/cm 2 | Δ additional content mg/cm 2 | Increase % |
| Not | 52 | 0 | 0.40 | 0 | 0 |
| Be | 55 ** | ca76 | 0.46 | 0.06 | 15 |
| Be | 66-70 | 228 | 0.67 | 0.27 | 67.5 |
*The glue spread that keeps is by measuring with back film is weighed of coating before coating.
*Hereinafter will handle to the film of this degree and be called DC1-AD1.With its getable peak power this film has been carried out corona treatment by the traditional corona processor (described in US5296170) that is used to handle the tubulose casing.Be about 75Watt-min/M by measured dyne value estimated power density
2
Employed coating is coating C1, and its composition is as shown in table 1.
Result in the table 2 shows that the amount that can be absorbed into the solution of internal layer has increased by 67%, and it is directly related with the corona treatment degree to be absorbed into the coating amount of film internal surface.
It is so high to observe degree of surface activation in experiment, to such an extent as to the dyne value has exceeded the range of dyne measuring technology commonly used.Therefore, in the test afterwards, assess degree of surface activation according to power density.
Come rated output density by following formula:
Those skilled in that art should know also that the excessive greatly above-mentioned dyne value that obtains by corona treatment is to be used to promote the meat tack.It has been generally acknowledged that the dyne value can provide acceptable meat tack for 40 to 50 o'clock.It has been generally acknowledged that in this area and film handled to make its dyne value be about 50 dyne when above, this film will be exceedingly attached to the meat surface.Find surprisingly that under situation of the present invention although degree of surface activation is very high, this film fitly separates unexpectedly, and does not stay scar on the meat surface from the meat surface.
The amount of liquid that can be absorbed in the polyamide layer for further proof is the function of corona treatment, respectively with two kinds of different corona horizontal processings in table 1 test used film.Then film is applied moisture, the amount of moisture that is absorbed is measured according to American Standard of Testing Materials (ASTM) 570.This test need be placed sample 24 hours in 50 ℃ baking oven and be cooled off in moisture eliminator and carry out damping, weighs immediately then, is accurate to 0.001g.After the damping, sample is immersed in the distilled water, and kept 72 hours down in room temperature (23 ± 1 ℃).After the end of test (EOT), from water, take out sample, dry lip-deep all moisture, weigh immediately then, be accurate to 0.0001g with dried cloth.
Per-cent for weight during the calculating dipping increases, can use following formula:
Test result is as shown in table 3.
Table 3
| Test | The kind of casing | The weight that % obtains | W-min/m 2 |
| 1 | DC1 (without corona treatment) | 12.9 | -- |
| 2 | DC1-AD-1 | 14.7 | About 75 |
| 3 *** | DC1-AD-1 | 18.7 | 189.3 |
* *For testing 3, level shown in the internal surface of DC1-AD-1 film is further handled.By shown in power density estimate that the dyne value be more than or equal to 70, test but on this level, can't carry out reliable dyne.
The result shows the raising along with corona treatment level, and corona treatment has improved the amount of moisture that is absorbed.
In order to confirm that this solution also is absorbed, and has designed following test in the time will containing the solution of smoking tinting material and be applied to the internal surface of film:
Film sample is cut into the shape that is complementary with circular cranse, and it is similar that this cranse is used for tightening the cranse of cloth cover when embroidering.The internal surface of film is placed in the cranse, make the edge of cranse and film form a container.Then film is sandwiched in the cranse.
Film sample is sandwiched in the cranse.Internal surface to the film with polymeric amide/laminated film tack coat/polyamide structure adds the solution (C20) that contains Maillose.(hereinafter this film being called V9).Solution joined just cover film surface.This method guarantees only have the solution that is applied on the film internal surface, has simulated lavage approx.Shelve sample, make it contact 72 hours with solution.
From cranse, pour out excessive solution, and sample is taken off from cranse, wipe lip-deep complete soln with dried cloth.Sample is heated to 250 , heated 30 minutes, weigh then, be accurate to 0.0001g.
Table 4 has been summed up the resulting result of this test.
Table 4
| Material | Handle w-min/m 2 | Absorb % |
| The V9-contrast | 0 | 23.9％ |
| V9-50 | 50 | 28.6％ |
| V9-100 | 100 | 30.4％ |
| V9-150 | 150 | 37.0％ |
| V9-200 | 200 | 33.1％ |
| V9-250 | 250 | 32.2％ |
| V9-300 | 300 | 30.6％ |
| V9-400 | 400 | 30.1％ |
| V9-500 | 500 | 31.4％ |
The result shows the raising along with inner corona treatment level, and the solution amount that is absorbed also increases.
Embodiment 3-is shirred, fill and processing
Activate film and it is applied composition with embodiment 2 described modes.Through coating being attached to and/or absorbing on the roller after the needed time, with the shirred one-tenth of this film " rod ".Can prepare through shirred tubulose casing with conventional shirred machine known in the art.
By stuffing horn ham or turkey meat goods are pushed in shirred casing then.
By in baking box, with steam or hot water heating for some time, making food reach the internal temperature of 160 , come then cooking through the food of packing.The relative humidity of baking box remains on 100%, and temperature remains 185 .The temperature of steam and hot water is as shown in table 5.After the filling as early as possible shown in different time cook.
Under the situation of not carrying out corona treatment and dipping, contrast.
The result is summarised in the table 5.
Table 5
| Product type | The composition code | Tinting material | Film type | Internal layer | Handle W-M/m2 | Additional content mg/cm 2 | The increase * of % film weight | The L value of colorimetric analysis | Remarks |
| Bologna | C 20 | Maillose | DC1-1 AD-1 | Nylon+PVPP | 318 | 0.67 | 26.35 | 53.21 | Uniform exsiccant golden red brown |
| Bologna | C 21 | Fumeol | DC1-1 AD-1 | Nylon+PVPP | 309 | 0.76 | 29.99 | 54.48 | Uniform exsiccant golden brown |
| Bologna | Do not have | Do not have | DC1-1 AD-1 | Nylon+PVPP | Do not have | 0 | 0 | 65.57 | The uniform shallow brown of exsiccant |
| Ham | C 9 | Fumeol | DC1-1 AD-1 | Nylon+PVPP | 102.6 | 1 | 39.33 | 56.62 | With 165 water moulding |
| Ham | C 9 | Fumeol | DC-1 AD-1 | Nylon+PVPP | 102.6 | 1 | 39.33 | 53.18 | With 195 water moulding |
| Ham | Do not have | Do not have | The V-1 contrast | LLDPE | Do not have | 0 | 0 | 65.13 | With 165 water moulding |
| Turkey | C 3/02 | Maillose | DC1 AD1 | Nylon+PVPP | 300 | 0.42 | 16.62 | 67.4 | Evenly, light color |
| Turkey | Do not have | Do not have | The V1 contrast | LLDPE | Do not have | 0 | 0 | 75.1 | Evenly, light color |
| Turkey | C7 | Maillose | DC1 AD1 | Nylon+PVPP | 216.2 | 0.84 | 33.04 | 61.56 | Process immediately with 185 ° of steam |
| Turkey | C7 | Maillose | DC1 AD1 | Nylon+PVPP | 216.2 | 0.84 | 33.04 | 69.78 | In 185 ° of steam, kept 4 hours |
| Turkey | C 1/03 | Maillose | DC1 AD1 | Nylon+PVPP | 289 | 0.82 | 33.04 | 67.99 | 1 minute hot water kept 4 hours in 185 ° of steam |
| Turkey | C 1/03 | Maillose | DC1 AD1 | Nylon+PVPP | 289 | 0.82 | 33.04 | 62.3 | 3 minutes hot water kept 4 hours in 185 ° of steam |
| Turkey | C 1/03 | Maillose | DC1 AD1 | Nylon+PVPP | 289 | 0.82 | 61.8 | 6 minutes hot water kept 4 hours in 185 ° of steam | |
| Turkey | Do not have | Do not have | The V-1 contrast | LLDPE | Do not have | 0 | 0 | 75.47 |
| Product type | The composition code | Tinting material | Film type | Internal layer | Handle W-M/m2 | Additional content mg/cm 2 | The increase * of % film weight | The L value of colorimetric analysis | Remarks |
| Turkey | C x | Fumeol | DC1 AD1 | Nylon+PVPP | 256 | 1.4 | 64.19 | ||
| Turkey | C 9 | Fumeol | DC-1 AD-1 | Nylon+PVPP | 102.6 | 1 | 39.33 | 65.6 | With 165 water moulding |
| Turkey | C 9 | Fumeol | DC-1 AD-1 | Nylon+PVPP | 102.6 | 1 | 39.33 | 63.38 | With 195 water moulding |
| Turkey | Do not have | Do not have | The V-1 contrast | LLDPE | Do not have | 0 | 0 | 75.94 | With 165 water moulding |
| Ham | C 9 | Fumeol | The V-1 contrast | LLDPE | 0 | 0 | 0 | 64.99 | |
| Ham | C 9 | Fumeol | Visflex | Nylon | 616.0 | 0.85 | 57.61 | ||
| Ham | C 9 | Fumeol | V9-2 | Nylon | 616.0 | 0.80 | 56.37 | ||
| Ham | C 9 | Fumeol | AD-1 | Nylon+PVP | 200.00 | 0.80 | 31.36 | 55.89 | |
| Ham | The Sun product | Absorptivity Fibrous Mierocrystalline cellulose | Do not have | Do not have | 52.79 | With 165 water moulding | |||
| Ham | C 9 | Fumeol | AD-2 | Nylon | 308 | 0.93 | 51.40 |
L value-numerical value is low more, and color density is big more
The increase of % film weight is calculated according to following formula by additional content:
Visflex is the commercially available film that derives from Viskase, and its structure is: nylon/EVA/ nylon.
V9-2 is the commercially available film that derives from Vector, and its structure is: nylon/laminated film tack coat/nylon.
V1 is the commercially available film that derives from Vector, and its structure is: nylon/laminated film tack coat/LLDPE.
The Sun product is commercially available absorbability plastic/Mierocrystalline cellulose stratiform casing, wherein is absorbed with colourant solution.
Have been found that the influence of the time between the final color of transferred product can be filled and process.It is believed that this be since be processing in heat color is fixed to product surface.If postpone for some time reprocessing, then the color compound will be absorbed in the meat products.
If also observe and do not carry out surface treatment and just process, above last coating roll undue alluvial (pooling) can appear then, liquid converge in pipe than low spot.In addition, moistening through the surperficial feel of coating, can wipe liquid from this surface.Although have some annexation and color to transfer on the meat product, the transfer of color is inhomogeneous and unacceptable in practice, has shown lip-deep inhomogeneous coating.Known inhomogeneous coating can not fully be absorbed, and can hinder follow-up shirred and stuffing operation.On the other hand, when pipe is carried out corona treatment, the alluvial phenomenon does not appear.And the internal surface feel of pipe is wet, on the treated surface also without any the liquid that can wipe.It is believed that these observationss have supported this liquid to be absorbed in the surface at least in part and idea that discontinuous coating do not occur.
Fig. 1 has shown the photo that is packaged in the ham in the film of the present invention of comparing with the contrast ham.
Fig. 2 has shown the photo that is packaged in the turkey product in the film of the present invention of comparing with the contrast turkey.
These accompanying drawings are presented at the ham and the turkey goods of cooking in the film of the present invention and all have uniformly brown through what smoke.The homogeneity of color shows and composition not only can be absorbed into the surface uniformly, and this homogeneity can tolerate the destruction of being caused because of shirred and filling work procedure.The liquid that is absorbed has also shown snappiness to stretching during filling and the contraction during the film thermal contraction.In addition, do not exist the sign that releases or cook out and film to the unacceptable tack of meat product.
Embodiment 4-scanning electron microscopy study
For the absorption characteristic of the treated film of further research, to DC1 with about 300W-min/M
2That power level was handled and composition C7 is applied to treated lip-deep DC1-AD-1 has carried out scanning electron microscopy study.PRELIMINARY RESULTS show untreated film and absorb after film between main difference be: thickness is that 10 microns the porous internal layer with irregular surface form has become the innermost layer that thickness is 5 microns porous layer and the thickness atresia with irregular surface form that is 5 microns.This shows that composition has been absorbed into theca interna, and its degree of depth of flooding this internal layer is about 1/2 of its original thickness.
For this is confirmed, before liquid is applied to internal surface and afterwards, the DC-1 AD-1 that water and methanol extraction are crossed has carried out scanning electron microscope analysis.The analytical results of the impregnated sample that water and methanol extraction are crossed shows, being extracted on the form of the thin film layer of dipping of water and methyl alcohol stayed the physics line of delimitation, and this line of delimitation is positioned at half degree of depth place of its original tranverse sectional thickness.The exemplary scan electron microscope photomicrograph of taking with 1000 times ratio of enlargement is shown in Fig. 3,4,5 and 6, and described photo is represented untreated film, the untreated film of crossing through the film of dipping, with methanol extraction and the film of crossing with methanol extraction through dipping respectively.
As can be seen, above-mentioned film and method can provide and can keep a large amount of films that is absorbed in liquid wherein.The tubulose casing of preferred embodiment can make liquid apply thereon equably.In addition, that the tubulose casing can also carry out is shirred, fill and cook operation, thereby additive is transferred to food surfaces equably.
Should be appreciated that and under the prerequisite that does not break away from its spirit and scope, to carry out various changes and improvement the present invention as described herein.
Claims (44)
1. film, described film has the liquid that is absorbed at least in part wherein, wherein described liquid is applied to the surface of film, and before applying described liquid to described surface, surface activation process is carried out on described surface, the dyne value that makes described surface have to be at least 50 dyne, and described film after the described surface activation process the amount of liquid that can absorb be higher than before described surface activation process the amount that can absorb.
2. film as claimed in claim 1, wherein said surface activation process is selected from plasma treatment, flame treating, corona discharge, uviolizing, electron beam irradiation or gamma-radiation.
3. film as claimed in claim 1, wherein said surface activation process is a corona discharge.
4. film as claimed in claim 3, wherein said corona discharge is with 50W-m/M
2～1000W-m/M
2Power level carry out.
5. film as claimed in claim 4, wherein said power level are 100W-m/M
2～600W-m/M
2
6. film as claimed in claim 1 is wherein thought 0.4mg/cm with described liquid
2～10mg/cm
2Amount be applied to described surface.
7. film as claimed in claim 1, described film are the food product packing film form, and wherein, in use described surface is the surface with Food Contact.
8. film as claimed in claim 1, wherein said film comprises the polyamide material layer, and described liquid absorbs at least in part to described layer.
9. film as claimed in claim 8, wherein said polyamide material comprise polymeric amide and crosslinked polyvinylpyrrolidone.
10. film as claimed in claim 8, wherein said film are the polyamide material form of individual layer.
11. film as claimed in claim 8, described film has at least two layers, and described two layers are the second layer that contains the first layer of polyamide material and contain the polyolefine material layer, wherein, in use, described aramid layer is that the internal layer and the described polyolefine of this film are the skin of this film.
12. film as claimed in claim 7, described film are tubulose casing form.
13. film as claimed in claim 7, wherein said liquid mainly is made up of water.
14. film as claimed in claim 7, wherein said liquid are the compositions that comprises the additive of at least a food that is used for transferring to packaging.
15. film as claimed in claim 14, wherein said additive are selected from tinting material, seasonings and painted seasonings.
16. film as claimed in claim 15, wherein said additive comprises Mei Lade reagent.
17. film as claimed in claim 7, wherein said liquid comprises the reagent that is selected from biocide, sterilant or antiviral agent.
18. method for preparing film, described film has the liquid that is absorbed at least in part wherein, said method comprising the steps of: surface activation process is carried out on the surface to described film, so that described surface has the dyne value that is at least 50 dyne, and described film after the described surface activation process the amount of liquid that can absorb be higher than before described surface activation process the amount that can absorb.
19. method as claimed in claim 18, wherein said surface activation process is a corona discharge.
20. method as claimed in claim 18, wherein said corona discharge is with 50W-m/M
2～1000W-m/M
2Power level carry out.
21. method as claimed in claim 19, wherein said power level are 100W-m/M
2～600W-m/M
2
22. method as claimed in claim 18, wherein said film are the form of food product packing film, thereby the internal surface that in use described surface is described film.
23. method as claimed in claim 22, wherein said film comprises the polyamide material layer, and described liquid absorbs at least in part to described layer.
24. method as claimed in claim 23, wherein said polyamide material comprises polymeric amide and polyvinylpyrrolidone.
25. method as claimed in claim 24, wherein said film is an individual layer.
26. method as claimed in claim 23, described film has at least two layers, described two layers are the second layer that contains the first layer of described polyamide material and contain the polyolefine material layer, wherein, in use, described aramid layer is that the internal layer and the described polyolefine of this film are the skin of this film.
27. method as claimed in claim 22, wherein said film are tubulose casing form.
28. method as claimed in claim 26, wherein described liquid is applied to described surface after, carry out shirred to described casing.
29. method as claimed in claim 22, wherein said liquid mainly is made up of water.
30. method as claimed in claim 22, wherein said liquid are the compositions that comprises the additive of at least a food that is used for transferring to its packaging.
31. method as claimed in claim 29, wherein said additive is selected from tinting material or seasonings.
32. method as claimed in claim 30, wherein said additive comprises Mei Lade reagent.
33. method as claimed in claim 18, wherein be applied to described liquid on the described surface after, make described film become between the breaker roll to pass, and the space length of described roll shop building be set at thickness less than described film.
34. comprising, the method for a processed food, described method package foods in the film as claimed in claim 13.
35. comprising, the method for a processed food, described method package foods in the film as claimed in claim 15.
36. also comprising, method as claimed in claim 34, described method cook described food.
37. method as claimed in claim 36, described method comprise described film is taken off from described food.
38. also comprising, method as claimed in claim 35, described method cook described food.
39. method as claimed in claim 38, described method comprise described film is taken off from described food.
40. one kind with the finished food of method as claimed in claim 36.
41. one kind with the finished food of method as claimed in claim 38.
42. food product packing film, described food product packing film has at least one upper layer that is formed by polyamide material, and described upper layer has the liquid that is absorbed at least in part in the polyamide material, wherein described liquid is applied to the surface of described polyamide material, and before applying described liquid to described polyamide material, described upper layer is carried out surface activation process, the dyne value that makes described surface have to be at least 50 dyne.
43. film as claimed in claim 42, wherein said film has second polyolefin layer.
44. film as claimed in claim 42, wherein said aramid layer comprise the blend of polymeric amide and crosslinked polyvinylpyrrolidone.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US45444403P | 2003-03-13 | 2003-03-13 | |
| US60/454,444 | 2003-03-13 | ||
| US60/501,339 | 2003-09-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1761702A CN1761702A (en) | 2006-04-19 |
| CN100378148C true CN100378148C (en) | 2008-04-02 |
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|---|---|---|---|
| CNB2004800068511A Expired - Fee Related CN100378148C (en) | 2003-03-13 | 2004-03-11 | Film having a liquid absorbed therein |
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| Country | Link |
|---|---|
| CN (1) | CN100378148C (en) |
| UA (1) | UA82084C2 (en) |
| ZA (1) | ZA200507010B (en) |
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| EP2796048B2 (en) | 2013-04-23 | 2023-03-08 | ViskoTeepak Belgium NV | Artificial food casing, method for removing and method for manufacturing thereof |
| CN107175859A (en) * | 2017-07-14 | 2017-09-19 | 芜湖市三山区绿色食品产业协会 | PA/ aluminium/PVDC composite food package films and preparation method thereof |
| CN107310220A (en) * | 2017-07-14 | 2017-11-03 | 芜湖市三山区绿色食品产业协会 | PE/ aluminium/PET composite food package films and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997036798A1 (en) * | 1996-04-01 | 1997-10-09 | Cryovac, Inc. | Modifier transfer film and method of cooking a food product |
| CN1171036A (en) * | 1994-11-09 | 1998-01-21 | 改革包装有限公司 | Method and material for extending the shelf-life of fresh foods |
-
2004
- 2004-03-11 CN CNB2004800068511A patent/CN100378148C/en not_active Expired - Fee Related
- 2004-11-03 UA UAA200508596A patent/UA82084C2/en unknown
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2005
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1171036A (en) * | 1994-11-09 | 1998-01-21 | 改革包装有限公司 | Method and material for extending the shelf-life of fresh foods |
| WO1997036798A1 (en) * | 1996-04-01 | 1997-10-09 | Cryovac, Inc. | Modifier transfer film and method of cooking a food product |
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| Publication number | Publication date |
|---|---|
| CN1761702A (en) | 2006-04-19 |
| ZA200507010B (en) | 2006-07-26 |
| UA82084C2 (en) | 2008-03-11 |
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