CN1429741A - Packaging bag and its making method - Google Patents

Abstract

A packing bag for food is composed of a first film layer with several slits generated by calendering and a second film layer to interlock with several lateral edges of the first film layer. Its preparing process includes such steps as preparing high-molecular films, calendering, coating, hot pressing for enclosing edges, and cutting for removing excessive edges. It features that the food contained in it can be easily heated by microwave oven, high-temp. steam, boiling or infrared ray.

Description

Packaging bag and manufacture method thereof

One, technical field:

The present invention relates to package packing supplies, relate in particular to a kind of packaging bag and manufacture method thereof.

Two, background technology:

The connection with wrapping of piece that comparatively common in the market micro-wave oven uses has preservative film (wrapfilm), the special-purpose bag of micro-wave oven and dish tool etc.The raw MAT'L that these connection with wrapping of piece use has polyethylene (PE), polypropylene (PP), poly-thiamines (polyamide, nylon), polycarbonate (PC), polyvinylchloride (PVC), polyvinylidene chloride (PVDC), polymethylpentene (PMP), ethylene-ethyl acetate (ethylene-vinyl acetate, EVA), Polyurethane (polyurethane, PU) or SurlynTM (trade name of Dupont ionomer ionic high molecular cpd), poly terephthalic acid diethylester (polyethylene terephthalate, PET), polyvinyl alcohol polyvinyl alcohol, PVA), paper, synthetic paper, glass paper (cellophane), paraffin paper, pottery (ceramic), the material or the composites of above-mentioned material such as glass, the structure of connection with wrapping of piece can be the simple layer structures, composite multi-layer structure and foaming structure etc.

The connection with wrapping of piece practitioner is the manufacturing of this class connection with wrapping of piece for convenience, and regular meeting adds some plasticizers (plasticizer additives) in the manufacturing process of product.Therefore, the additive in the packaging for foodstuff article can be in packaging for foodstuff, store, transport or the micro-wave oven heating is boiled in the process, with the food direct contact, and causes food contaminated and harm healthy problem.In view of this, U.S. food and board of health (FDA) and domestic hygiene and health Bur St are more and more stricter trend to the requirement and the restriction of packaging material for food, except require food must not packaged material contamination, also increased heatproof characteristic and standard low, Pintsch process that packing and high temperature use.

When sealed packed food utilizes the micro-wave oven heating, normal because of rapid temperature-raising in the seal cavity and supercharging phenomenon, cause the packaging bag gas explosion, for fear of the gas explosion phenomenon, normal food packing production firm all advises, before the heating of use micro-wave oven or the food that boils, must reserve an opening on packaging bag or dish tool, the high temperature and high pressure gas that heating is boiled produced in the process can pressure release, to avoid explosion phenomenon.U.S. Ziploc company packs by appointing on the bag at the microwave freezing special food of its production, and the instruction user must open a breather hole by a bag before micro-wave oven uses, to avoid blast.This using method makes the food that is subjected to microwave heating process be in an open space, and volatile component is passed mistake in a large number owing to be heated in the food in heat process, causes food exsiccation hardening to lose delicious food.

The food of heating prepared food flours, as steamed stuffed bun, boiled dumpling, pasta etc., after coating preservative film, general use steam oven (steam cooker) or food heats with micro-wave oven, though the former can keep the food delicious food, but when absorbing excess moisture, food can expand or stick with paste, though the latter can save time, but food is subjected to microwave heating, and internal moisture is outwards loose fast and flown, because preservative film is waterproof, add the low-k material behavior of itself, at microwave heating process, the food material that the thermal conversion rate of its microwave energy has high-dielectric coefficient is low, and the preservative film self-temperature is lower, so these outer aqueous vapors of passing can be condensate in the interface that food contacts with preservative film, the part that causes food to be covered by preservative film has the phenomenon of falling of paste, and the part that is not capped has the phenomenon that becomes stiff, makes the delicious food that do not have of food change.

For this reason, successively there are many different types of breathinies material to be developed, one of manufacture method of the breathing material that these are commonly used, as U.S. Patent number 3378507,3310505,3607793,3812224,4247498,4466931, the technology that 5928582 cases are disclosed, comprise utilize inconsistent material filming after, re-using extracting process will be wherein after a certain component stripping, form hole shape structure, this breathing material is to be applied on filtration or the parting material (filtration and separation) mostly, as allowing the barrier film (separator) of electrolyte circulation in the battery, purification of water or sea water desalination are with isolating dialysis membrane (dialyticfilm), because the mechanical strength and the porosity of this kind material layer have inverse relation, when being applied to microwave food packaging, the explosion phenomenon that still has microwave heating process, and it is remaining when extract is not too much, the high dielectric constant that microwave heating process easily has because of itself changes into heat energy process stroke heat centrostigma (heat spot) at microwave energy, make the molten pore-forming of wearing of packing local heating, volatile component in the food thereby a large amount of the loss, therefore, this material is not suitable for use in microwave packaging and uses, and its manufacturing cost height, extraction solution reclaimer complexity.Another kind of breathing material, the technology that is disclosed as US Patent 5865926 cases, be to utilize adhesive-bonded fabric or fiber cloth, this method makes breathable film have huge hole (macro porous) characteristic, be applied to paper nappy and hygenic towelette mostly, and its manufacturing cost height, also uncomfortable cooperation microwave food packaging is used.Also has a kind of manufacture method of commonly using breathing material, the technology that is disclosed as US Patent 3679540,4187390,4350655,4466931,4777073,5340646 cases, by the inorganic material powder, evenly be blended in the high-molecular organic material as calcium carbonate, titanium oxide, aluminium oxide, as polyethylene, film extrusion then.Film build method comprises utilizing to have concentric circles die orifice (die) extruding injection method and obtain cylinder and draw bag or blow bag, extend that tension machine (tenter) stretches or modes such as extruding ejaculations, then resist or near the processing temperature of material softening point under carry out film stretching extension processing.Though this method can produce micropore hole (micro porous), but manufacturing cost is too high and difficulty is big, still there is the explosion phenomenon in the heat process, the inorganic salts additive that adds in it belongs to the material of a kind of low specific heat and high dielectric constant mostly, at the focus that is subjected to that is subjected to be easier under the thermal environment stroke part, by the problem of burn through packing, therefore also impracticable.In addition, this method can cause the quality of Breathable films to differ, for example degree such as extensibility, processing temperature, film thickness and formula for raw stock can cause hole size inconsistent, and the use of additive differs for the influence of subsequent environments, may cause environmental issue.Moreover it is made often because of the heterogeneous combination (multiplephases) of additive, does not possess properties of transparency after making film forming.Also have, when this material was applied to packaging for foodstuff, the additive in the material had the possibility of polluting packaged food, can cause food peculiar smell (unpleasant od ors).When this class Breathable films contact contains oil or alcohol food, can not stop oil and alcohol effectively, can cause the interior oxygen scavenger components of food Package to be coated pollution, can't reach the fresh function of maintenance food by oil or alcohol.

Three, summary of the invention:

In view of this, the objective of the invention is for overcoming the existing above-mentioned shortcoming of the packaging bag of commonly using, and provide a kind of employing to have packaging bag and manufacture method thereof that through hole air-permeable structure material is made.

For solving above-mentioned technical matters, the present invention takes following technical scheme.

Packaging bag of the present invention, it is made of the first mould layer and second rete, wherein, first rete is provided with several cracks of rolling generation, and is provided with rete for the first time, and second rete and first rete are mutually to folded, the mutual involution of several sides of the second mould layer and first rete forms the bag shape with opening.

For solving above-mentioned technical matters, the present invention can also take following technical measures.

Aforesaid packaging bag, wherein the first apotype layer is selected from by propylene, polyesters, polyethylene, polypropylene, poly-thiamines, polyethylene and polyacrylic co-polymer, ethene and cinnamic co-polymer, ring-type alkene co-polymer, poly terephthalic acid diethylester, polyvinyl alcohol, ethylene-ethyl acetate or by ionic high molecular cpd, carbowax the material of the heat sealability that co-polymer, Polyurethane, synthetic paper, the paraffin paper heat of naphthalate, poly ether-ketone (PEK), polycarbonate, polysulfones, polythioamine, polypropylene cyanogen, styrene and propylene cyanogen are melted is made.

Aforesaid packaging bag, wherein the first mould layer also is provided with one second apotype layer, this second apotype layer is positioned at a side of the first apotype layer, and this second apotype layer is selected from by propylene, polyesters, polyethylene, polypropylene, poly-thiamines, polyethylene and polyacrylic co-polymer, ethene and cinnamic co-polymer, ring-type alkene co-polymer, the poly terephthalic acid diethylester, polyvinyl alcohol, ethylene-ethyl acetate or by ionic high molecular cpd, polyethyleneterephthalate, poly ether-ketone (PEK), polycarbonate, polysulfones, polythioamine, polypropylene cyanogen, the co-polymer of styrene and propylene cyanogen, Polyurethane, synthetic paper, glass paper, the paper wood of High molecular material coating, the paper low melting point, the high melting point material is made.

Aforesaid packaging bag, wherein the first mould layer also is provided with a mould layer for the third time, this for the third time the mould layer be positioned at a side of the second apotype layer, this for the third time mould layer and the first apotype layer be positioned at not homonymy, the mould layer is made by low-melting heat sealability material for the third time.

Aforesaid packaging bag, wherein the surface of the first mould layer is provided with an involution material, and to insert in the crack, this involution material is selected from the material of being made up of grease class, wetting agent, wax, aliphatic acid and derivant thereof, starch and starch-containing derivant thereof, glue and makes.

Aforesaid packaging bag, wherein the packaging bag opening part is provided with the binding fastening structure of a switch opening.

Deoxidation gas material is wherein added in aforesaid packaging bag in the packaging bag, this deoxidation gas material is selected from the oxidizable metal material by iron, aluminium, zinc, nickel, copper, manganese, weight sodium sulfate, ferric sulfate, zinc sulphate and cmpd thereof.

Aforesaid packaging bag, wherein the grease class is saturated grease, unsaturation grease and hydrogenated oil and fat.

Aforesaid packaging bag, wherein wax is natural wax or artificial synthetic wax; Wherein natural wax material is paim wax, paraffin, micrinite wax, beeswax, rice bran wax, and artificial synthetic wax is the oxide synthetic wax of Tissuemat E, its chlorinated polypropylene wax, poly-ethoxy resin wax, artificial synthetic wax, petroleum product, Dormant oils product, polyolefins, wax.

Aforesaid packaging bag wherein links fastening structure and is sliding type zip strip, repeatedly open-close type sealing strip, adhesive tape thread gluing, super sonic pressing mode and add the hot pressing mode.

For solving above-mentioned technical matters, the present invention takes following technical scheme.

The manufacture method of packaging bag of the present invention, finish by preparation macromolecule membranous layer operation, roller compaction processes, painting process, hot-pressing, edge-sealing operation and side cut operation, preparation rete operation comprises the single rete base material of preparation and several layers of composite film base material, roller compaction processes is macromolecule membranous layer to be rolled to make be formed with several crack area on the rete, painting process is that the involution material layer is coated on the rete that is formed with crack area, the hot-pressing, edge-sealing operation is after first rete and second rete are superimposed with each other, leave an open end, all the other side Heat Sealings become the packing bag.

The present invention is simple in structure, and the material selection science does not produce public hazards, and compliance with environmental protection requirements is satisfactory for result, reaches the desired design purpose.

Four, description of drawings:

Figure 1A is the single rete matrix structure of a present invention scheme drawing.

Figure 1B is the two-layer rete matrix structure of a present invention scheme drawing.

Fig. 1 C is a trilamellar membrane layer matrix structure scheme drawing of the present invention.

Fig. 2 A forms a kind of fracture shape scheme drawing for invention rolls.

Fig. 2 B forms another kind of fracture shape scheme drawing for invention rolls.

Fig. 2 C forms another fracture shape scheme drawing for invention rolls.

Fig. 3 forms criss-cross fracture shape scheme drawing for invention rolls.

Fig. 4 is provided with coating involution material layer scheme drawing on the rete of crack for invention.

Fig. 5 implements view for invention.

Another implements view to Fig. 6 for invention.

Fig. 7 A is an invention preparation technology schematic flow sheet.

Fig. 7 B is another preparation technology's schematic flow sheet of invention.

Fig. 7 C is the another preparation technology's schematic flow sheet of invention.

Fig. 7 D is for inventing preparation technology's schematic flow sheet again.

Five, the specific embodiment:

Consult shown in Figure 1A, the invention provides a film layer structure 100 has the energy hot melt for one deck heat sealability material, rete 10 shown in it is selected from by propylene (acrylic), polyesters (polyester), polyethylene (polyethylene, PE), polypropylene (polypropylene, PP), poly-thiamines (polyamide, nylon), polyethylene and polyacrylic co-polymer, ethene and cinnamic co-polymer (ethylene-styrenecopolymer, ES), ring-type alkene co-polymer (cyclo olefin), poly terephthalic acid diethylester (polyethylene terephthalate, PET), polyvinyl alcohol (polyvinyl alcohol, PVA), ethylene-ethyl acetate (ethylene-vinylacetate, EVA) or by (SurlynTm (Dupontionomer ionic high molecular cpd trade name), carbowax is to naphthalate (polyethylene naphthalate, PEN), poly ether-ketone (PEK) (poly ether ether ketone, PEEK), polycarbonate (polycarbonate, PC), polysulfones (polysulfone), polythioamine (polyimide, PI), polypropylene cyanogen (polyacrylonitrile, PAN), styrene and propylene cyanogen co-polymer (styrene acrylonitrile, SAN), Polyurethane (polyurethane, PU), synthetic paper, paraffin paper has the material of the heat sealability that can hot melt and makes.

Consult shown in Figure 1B, the invention provides another film layer structure 100 forms for two-layer material, comprise first tunic 10, for example has the heat sealability material that can hot melt, and second tunic 20, as low melting point or materials with high melting point, comprise propylene (acrylic), polyesters (polyester), polyethylene (polyethylene, PE), poly-mer, polypropylene (polypropylene, PP), poly-thiamines (polyamide, nylon), polyethylene and polyacrylic co-polymer, ethene and cinnamic co-polymer (ethylene-styrenecopolymer, ES), ring-type alkene co-polymer (cyclo olefin), poly terephthalic acid diethylester (polyethylene terephthalate, PET), polyvinyl alcohol (poly-vinyl alcohol, PVA), ethylene-ethyl acetate (ethylene-vinyl acetate, EVA) or by (SurlynTm (Dupontionomer ionic high molecular cpd trade name), carbowax is to naphthalate (polyethylene naphthalate, PEN), poly ether-ketone (PEK) (poly ether ether ketone, PEEK), polycarbonate (poly-carbonate, PC), polysulfones (polysulfone), polythioamine (polyimide, PI), polypropylene cyanogen (polyacrylonitrile, PAN), the co-polymer of styrene and propylene cyanogen (styrene acrylonitrile, SAN), Polyurethane (polyurethane, PU), synthetic paper (synthetic paper), paraffin paper, glass paper (glassine paper), the paper wood of High molecular material coating, paper etc.The material of the film that the present invention uses can adopt has the transparency or semi-transparency even opaque material.

Consult shown in Fig. 1 C, the invention provides another film layer structure 100, it is made up of three layers of material, comprise first rete 10, second rete 20 and tertiary membrane layer 30, first rete 10 is the heat sealability material of low melting point, second rete 20 is low melting point or high melting point material, and trilamellar membrane layer 30 is the heat sealability material of low melting point.

Consult shown in Fig. 2 A, Fig. 2 B, Fig. 2 C, for the present invention carries out cross-section structure after the roller compaction processes, the process of rolling is towards second side, 14 directions from rete 10 first sides 12, rete 100 is rolled, the process of rolling comprises that comprehensive grinding or selective area roll, rolling apparatus can adopt continous way to press nips or batch to flattening platform prescription formula, the former is than the tool economy.In the platform group one taken turns or a flat-bed surface is provided with the prominent shape structure (not shown) of several points to press nips or to flattening, and the prominent shape structure of this point is made by following method: 1, electro-plating method evenly plates work from the teeth outwards with the similar particle powder of polyhedron diamond grains powder or high hardness.2, the laser beam cutting mode becomes several evenly faces that rolls of the prominent shape structures of point with hard Polymer, metal or stupalith engraving (engraving), for example the ceramic wheel (anilox roll) that forms of laser beam cutting.3, mechanical die mould (tooling) processing mode, the surperficial even sharp lug structure with the metal surface die mould of a suitable hardness becomes to need carries out the face that rolls that case hardening processing (hardening treatment) forms last needs subsequently again.4, the metal surface is carried out after chemical electrolysis is etched into even sharp lug structure, carry out case hardening again and be processed into hard and roll face.In addition, rolling wheel is corresponding can be metal, plastic-steel or the stupalith with suitable hardness to pinch roller or to the pressure surface material.No matter use the rolling wheel of electroplated diamond wheel, mechanical die mould processing wheel or surface laser engraving, this rolls procedure for processing and makes and have several permanent destruction structures on the rete 100, it is crack area 15, the structure of crack area 15 can be a different shape, hole, crack, form rete 102 with permeability to air.Have needed involution and airing function for making to roll on the film (stabbed film), can be by selecting suitable material and cooperating different rolling wheels, rolling body and condition to realize.Crack area 15 also can have different distributions according to actual needs, for example can be comprehensive distribution, regional area distribution, systematicness distribution, irregularity distribution, actual using time and involution application device are decided on packed article, processing conditions and required rete and underfill materials.

The material that permeability to air rete 102 of the present invention is selected for use is not the solid friable material, it mostly is visoelasticity (viscoelastic) material, therefore the macro-structure of film after rolled by the short time shape memory effect that can have because of material itself, the material appearance major part will be recovered, only stay the material structure of permanent damage distortion, as the crack, just pass through the hole or the crack of the different shape that roller compaction processes produced, most of original planar appearance still can revert back to plane once more, but at this moment be the heterogeneous structure (multiple phases) that belongs to false plane (pseudo pianar sturcture), have the second permanent deformation slit-like structure phase in the regional film continuous phase that is just rolled.Use when of the present invention, the external world bestows the difference of pressure of film both sides, hot steam's pressure pressure in for example sealing, still can make the periphery of hermetically-sealed construction be subjected to rete struts distortion and presents once more and originally rolled formed fracture shape and become big, utilize this principle, under High Temperature High Pressure power difference ring border, make rete obtain the high ventilation effect.

Protrusion on the prominent rolling body of the present invention's point can be a line segment shape, conical, pyramid, the four directions taper, the polyhedral angle taper, cross cylindricality or other shapes, therefore through after rolling, also can have corresponding line segment shape on the permeability to air rete 102 before reverting back to false plane, conical, pyramid, the four directions taper, the polyhedral angle taper, the crack of cross cylindricality or other shapes, after rolling, because the memory effect of visoelasticity material itself, macro-structure on the rete 100, most of plane macro-structure will recover, only stay the crack material of permanent damage distortion, as hole or crack through the different shape that roller compaction processes produced.

Consult shown in Figure 3ly, fissured structure is a criss-cross, is the birds-eye view of subregion shown in Fig. 2 A, Fig. 2 B, Fig. 2 C, and feature of the present invention does not lie in and rolled the various holes in zone or the shape in various cracks, so, repeat no more.

Consult shown in Figure 4, the present invention optionally on first side 12 of rete 10, the involution material layer 16 of the low melting point of coating one deck.All can form involution material layer 16 on the rete 10 shown in Figure 1A, Figure 1B, Fig. 1 C; this involution material layer 16 can directly be coated on and be rolled processing with basic unit's rete again on the basic unit's rete 10 after rolling or after being coated on basic unit's rete 10 earlier; this involution material layer as gap filler to insert in hole and the crack; make rete not have at usual environment that rete has barrier property under the stress deformation situation, be stressed the effect distortion under the difference of pressure environment and become an air-permeable structure with through hole when two sides, rete crack exist.The involution material can be grease class, wetting agent, wax, aliphatic acid and derivant thereof (fatty acid and its derivatives), starch and starch-containing derivant (sta rch and amyloid materials) thereof, glue (adhesives).Grease class (oiland/orgrease) is saturated grease (saturated), unsaturation grease (unsaturated) and hydrogenation (hydrogenated) grease; Wetting agent (wetting) can be wetting with interfacial agent (surfactants); Wax (wax) is natural wax (natural wax) or artificial synthetic wax (man-made or synthetic wax); Wherein natural wax material is paim wax (palm-or carnaubawax), paraffin (paraffin wax), micrinite wax (microcrystalline wax), beeswax (beeswax), rice bran wax (rice bran wax) and other unlisted natural waxs, artificial synthetic wax is polyethylene (polyethylene oxide, PEO) wax, its chlorinated polypropylene (polypropyleneoxide, PPO) wax, oxidic polyethylene (polyethylene oxide, PEO) wax, the petroleum product that other are unlisted, the Dormant oils product, polyolefins polyolefin, the oxide synthetic wax of wax.Ventilated membrane of the present invention Fabrication procedure comprises and carries out a heat treatment step so that involution material layer 16 is inserted in the crack.With involution material layer 16 is the involution material to be mixed with forms such as different emulsion (emulsion solution) type, dispersion liquid (dispersion solution) type or micro mist granulation (micronized powder) type to be coated with and to form.If the present invention is applied on the packing of food, the involution material that adopts can be the wax or the grease class of use that FDA is approved, involution material of the present invention has numerous characteristics, comprise glossiness, printing and the heat sealing property that can not influence film, and in use do not have special peculiar smell, and do not feel and come (imperceptible).In addition, the breathable film texture ratio that rolls with the coating of wax layer does not have the breathable film that rolls of coating to have better water-repellancy and heat sealability, wherein, more with emulsion type wax and the consumption of FDA approval is arranged again, also have the involution material of antibiotic property, can be widely used in the packaging for foodstuff.Paraffin has splendid water-repellancy (water repellability), but can improve aqueous vapor (water vapor) ventilative speed, when therefore being applied in the leak free food pack, can avoid excessive aqueous vapor to burst packaging bag.

Though crack area 15 can revert back to the false flat state with crack, this layer involution material layer 16 also has part and infiltrates in the crack.The preferable melting point scope of this involution material is between 40 ℃ and 110 ℃, yet other range of temperatures also is applicable to the present invention.

When the present invention is applied on the packing of food, be the freshness that keeps being sealed up for safekeeping food, also can in involution material or rete, mix some and have the material of removing oxygen composition in the packaging bag, as some can oxidation metal ingredient (oxidizabie metal component), as iron, aluminium, zinc, nickel, copper, material or cmpds (chemical compound) such as manganese, as, weight sodium sulfate (sodium bisul fate), suifamic acid ferric sulfate (ferrous sulfate), zinc sulphate (zinc sulfate) etc. easily with the material of oxygen attack, or will above-mentionedly have to pack afterwards to seal jointly with permeability type pouch (sachet) except that the material of oxygen functionality (oxygen scavenger) puts in packaging film of the present invention.During practical application, because these materials of removing the oxygen composition are all mixed in low melting point material or film, so stock's phase before carrying out follow-up heat sealing step, its functionality of removing oxygen can be saved, and just begins to have the removal oxygen functionality of its function of removing oxygen or energy reserve part behind involution.In this heat sealing step or follow-up heat treatment step, the involution material layer 16 that has part further infiltrates in the cracks, makes the present invention obtain further sealing effectiveness.Therefore, in the rete course of processing of the present invention, applied heat treatment step optionally, for example microwave or infrared ray heating, the involution material that the rete appearance is coated with can positively be inserted in the crack of film surface, make and sealed up for safekeeping food and under low temperature and general temperature environment, have fresh-keeping, preserve moisture, moistureproof, the effect of anti-variable color and anti-peculiar smell, but along with heat process continues to carry out, food is in process is boiled in the micro-wave oven heating, because of microwave energy is converted to heat energy, the inside that makes food and envelope is heat accumulation air and high pressure high temperature vapor (hot air and steam buildup) at leisure, at this moment Feng Zhuan packaging bag rete is subjected to High Temperature High Pressure to influence outside extrusion extensional and makes that the change of crack openings space is big, the place, crack becomes a less safety relief of resistance and regulates through hole, also can because of high temperature and high pressure environment deliquescing attenuation or become a safety relief adjusting through hole that resistance less if the place, crack is coated with the involution material this moment, and have higher steam ventilative speed functions such as (vapor transmission rate).

Packaging bag of the present invention is applied to food (comestibie artices) when packing, can be in involution material layer 16 blending remove the material of oxygen composition, to reach the fresh-keeping and deodorizing effect of food.But, the invention is not restricted to be coated with the involution material, also can be under the situation of not having coating involution material layer 16, the material blending that directly will remove the oxygen composition can reach the fresh-keeping of food and deodorizing purpose equally in the rete substrate layer.

Encapsulation bag of the present invention is used for packaging for foodstuff and is used for the characteristics that micro-wave oven boils simultaneously and is, it is all very even that food after boiling boils degree everywhere, the fully enclosed packaging bag is in the process of microwave heating, the pressure cooker of similar of itself is general, can keep the moisture that contains in the food in the process that boils, the wine material, oil, delicious, fragrance and other special composition, because the high efficiency of heating surface and concentration of energy that micro-wave oven boils and had, make time of boiling of food shorten greatly and energy savings again, utilize the frozen food of low form encapsulation bag packing of the present invention, do not need to thaw earlier, edible after can directly frozen food being placed the micro-wave oven heating to boil, use very convenient.

Manufacture method of the present invention; at first prepare a permeability to air rete 102; as Fig. 2 A; Fig. 2 B; shown in Fig. 2 C; its at base material rete 10 through rolling; on this rete, form several cracks (gap); carry out before the roller compaction processes or afterwards; at the low melting point involution material layer 16 of the surface of this rete 10 coating, insert in hole and the crack as gap filler, rete is not had under the stress deformation at usual environment; has barrier; when two sides, rete crack are in the environment distortion down that the temperature and pressure difference is arranged, become one and have the through hole air-permeable structure, the crack can be a different shape; the average-size in crack is between 0,005 millimeter to 3 millimeters.The involution material layer can cover a side of this rete, and inserts in these cracks, and this rete is the material layer of a low melting point.The manufacture method of homogenous material and single rete base material is, a, love and respect after the high molecule plastic raw material of which melting extruded by strip extrusion mouth (slot) with extending tension machine (tenter), clamp fixing with the anchor clamps two ends, and along vertical mechanical stretching direction (Transversedirection, TD) extend, simultaneously along parallel film working direction (Machine direction, MD) carry out another action that stretches, the rete of gained is a biaxial stretchable film, biaxial stretched polypropylene (Biaxial oriented Polypropylene is used in the market at present, BOPP), poly terephthalic acid diethylester (polyethylene terephthalate, PET), (polyethylene naphthalate PEN) waits stretched PTFE film to carbowax to naphthalate.B, with inflation film manufacturing machine (Blown film machine) the high molecule plastic raw material of melting is squeezed extrusion by the mould mouth and become columned film, outwards calendering is stretched under high temperature and high pressure gas, making the blown film manufacturing process is to extend with the two-dimensional space of draw direction vertically, belong to a kind of biaxial stretchable film, the back segment operation is being cooled off and is being rolled after the overlapping rewinding of semicircumference length, at this moment if cut apart at an angle folding place of cylindric overlapped film, can obtain then that a film is wide to be total circumferential length of blown film, if dividing two angle folding places cuts apart, then can obtain the single-layer plastic film of two semicircumference length, this manufacturing process is many with fusing point lower polyethylene and polypropylene.Several layers of composite film production method for base material are, a, with two-layer, three layers and multiple field inflation film manufacturing machine (2-layers, 3-layers or multiple layers blown film machine) the high molecule plastic material of heterogeneity is made it melting by heating after, concentric die mouth by the hollow different levels squeezes extrusion again, become columned multilayer film, outwards extrusion is extended under high temperature and high pressure gas environment, making the blown film manufacturing process is to extend with the two-dimensional space of draw direction vertically, this class China ink layer is applied in the packaging for foodstuff mostly, the film of this moment belongs to the multi-layer compound film of moulding successively, gives as security film as co-extrusions such as multi-layer co-extruded signature polypropylene screen (CPP) and EVA/PE.B, drench film (Curtain coating machine), the high molecule plastic raw material of melting is squeezed extrusion by mould mouth T pattern mouth, the melting plastic membranous layer drenches uniformly and is attached on the film carrier, modal example is a paper, plastic film substrate, as drenching film PE on PET or the PP film, EVA or wax material, manufacture method is the directly molten substrate paper that is bonded at during with the plastic material high temperature melting of melting, on PET or the PP film, for improving substrate paper, PET, or the binding force between PP and the PE, substrate paper, PET or PP can pass through bunch discharge (corona treatm ent) before drenching film PE or surface modifier (surface moddifier reagent) is handled the change surface energy, to improve it to drenching the binding force of membrane material.C, applying complex film (Laminat ed composite film), use intaglio plate wheel, line rod, scraper or five coating process such as wheeled, on a side of predetermined another rete of will fitting on monofilm or the multilayer complex films, be coated with one deck adhesive coating earlier, paste again and be pressure bonded to another rete, make another new multilayer complex films, generally on packaging for foodstuff is used, how to avoid food make moist, how fresh-keeping, the water-repellancy of packing rete (water repellent), resistance oxygen, gas barrier property all are to need to consider.The present invention also can not be coated with low melting point involution material layer 16 on the surface of rete when using.The present invention can carry out the painting process of low melting point involution material layer 16 earlier, rolling becomes Breathable films layer 102 again, carry out rete 10 and low melting point involution material layer 16 roll step after, can optionally heat-treat operation, low melting point involution material layer 16 is further penetrated in the crack area 15 of permeability to air rete 102, further the effect of enhanced leaktightness.

Consult shown in Figure 5, the manufacture method of a kind of structure of packaging bag of the present invention is, the above-mentioned permeability to air rete 102 that makes is superimposed with each other from zone line doubling and medial surface, make low melting point involution material layer 16 be positioned at the inboard, just, be to belong to adjacent state face-to-face in the structure of low melting point involution material layer 16 after folding, permeability to air rete 102 superimposed remaining edge (the rest of sealed edges) involutions afterwards leave the open end (opne end) 17 that can insert article (food) together simultaneously.The open area is if need enclosing function, can adopt similar sealing bags (ziploc storage bag), one seal both sides by being positioned at the slide fastener (zipper) on the medial surface of rete open area groove and binding (interlocking) structure of raised line (gro ove and rib), this open area of switch.In addition, the method for involution open end can adopt also that direct use adhesive tape is bonding, laser pressing or add the mode of hot pressing.The packaging bag of this structure of the present invention can be directly used in the packing frozen food, when frozen-pack food is taken, open end needn't be opened and micro-wave oven heating or the boiling of indirect utilization high-temperature vapour can be directly utilized, poach and infrared radiation heating, in the process of micro-wave oven heating, the food that is frozen encapsulation directly is heated, the initial stage heated food is under the lower ambient temperature, temperature is also lower in the encapsulation bag, the vapour pressure that the inner contained moisture of food is heated association is also lower, temperature and the pressure that produces in the bag this moment are still low, packaging bag rete and the crack on it still are to be hermetically-sealed construction, obviously do not rouse protruding distortion and ventilative through hole, microwave energy was converted into heat energy by molecular vibration in the food composition and frictional influence and will be limited in the packaging bag this moment, because bag material is often used polyethylene, materials such as polypropylene or poly terephthalic acid diethylester, its relative dielectric constant value about 2.5, relative dielectric constant value 80 than hydrone is much lower, be converted in the heat energy process at microwave energy, the shared ratio of food is the highest, the intensification of system is mainly at food itself, also be that packaged food is fully boiled, along with proceeding of heating, temperature edges up in the packaging bag, the be heated vapour pressure of institute's association of moisture in the bag in the food is cumulative, the encapsulation sack is inner also to be increased with the external pressure difference, because sack expands, bag film internal pressure is outwards extruded, the outward extending deflection in crack on the sack rete is increased, open in the crack or the crack breach increases, packed food by boiling to which kind of degree, can be by the number in crack on the control rete, shape, distribution density, distributing position, thicknesses of layers, the factor of film material and packing crack material, last temperature or the ripe degree of decision food.When the food pack that is heated in hot environment following time, its relative vapour pressure is also high, at this moment impel joint sealing materials to be heated gradually softening or become liquid or thickness attenuation or split by solid, in addition, film is subjected to High Temperature High Pressure extrusion extensional, make the crack openings space become big, at this moment the place, crack also becomes a safety relief adjusting through hole that resistance is less, the dangerous phenomenon of the instantaneous explosion that hot air and HCS caused that can avoid this food enclosed in sealed bag to accumulate gradually in bag because of being subjected to thermal process like this.Hot permeability of the present invention encapsulation bag is directly sealed delicatessen up for safekeeping freezing standbyly after food boils, and when edible again, as long as place in the heating arrangement, as micro-wave oven, direct heating is peelable should eating behind encapsulation bag film after the short time heating.

The manufacture method of the another kind of structure of packaging bag of the present invention is, with first rete and second rete directly mutually to folded, at least on first rete, utilize roller compaction processes to form several cracks, be provided with an open end after first rete and second rete are superimposed, and all the other sides of involution.Sealing method is edible, and to add hot pressing (heat sealing), laser pressing, adhesive tape bonding, wherein with the Heat Sealing most convenient.This packaging bag film surface comprises an involution material layer equally, and the crack on the rete is inserted in the crack as gap filler, and rete is not had under the stress deformation situation at usual environment, has barrier.The open area also has a similar sealing bags (ziploc storage bag) of closing that is easy to open, one seals both sides by being positioned at zip strip (sliding zipper) or the groove of any pocket type (zipIock) and binding (interlocking) structure of raised line (gro ove and rib) on the medial surface of rete open area, this open area of switch.The method of this open end of involution can adopt also that directly edible adhesive tape is bonding in addition, laser pressing or add the mode of hot pressing.

Consult shown in Figure 6, the structure making process of air permeable wrapping bag 120 of the present invention also can be, two permeability to air retes 104 and permeability to air rete 106 are superimposed with each other together, involution three overlaps edge 32, the method at involution three edges can adopt open-close type sealing strip (ziploc), sliding type zip strip (sliding zipper), also can directly use adhesive tape bonding, laser pressing or utilization add the hot pressing mode, and keep an opening 50 of involution not as yet, usefulness with convenient continuous dress food, edible then different sealing method, as add hot pressing, the laser pressing, remaining edge involution beyond the opening 50 of the not involutions that the bonding method of adhesive tape is reserved this permeability to air rete 104 and permeability to air rete 106 superimposed backs together.During use, after the opening 50 of involution did not load, this opening of involution made food be arranged in a leak free encapsulation bag rete once more with food.The method of opening involution is a lot, can on opening 50 inboard two corresponding surfaces of packaging bag, one group of sealing strip 40 be set, connecting structure by groove and raised line, make things convenient for the user to open with closed, after adding sealing strip, the user only need draw back sealing strip just can put into or take out food or pending food at any time, after the user puts into article or food, only need the pressing sealing bar just can driving fit live packaging bag, then put into micro-wave oven or hot bath is heated.The user uses the permeability to air rete of the present invention technology of class sealing band therewith, can repeatedly utilize the applied air permeable wrapping bag of the present invention.

The Different Package condition and the demand of based food of the present invention design different method for manufacturing.Shown in Fig. 7 A, for taking out Fabrication procedure's flow process of film machine Production and Packaging bag, bag material adopts thermoplasticity High molecular material (thermoplastic polymer), the plastic material of melting is by the die orifice extrusion of inflation film manufacturing machine, and the film that makes after radially extending with operating direction, its structure belongs to a kind of duplicature of stack, carrying out the coating of product printing or gap filler surface before this rete enters roller and rolls earlier handles, in the roller compaction processes of film, the density that film rolls, the degree of depth with roll area and can be comprehensive, regional area, systematicness, irregularity distributes, final consumption temperature when the big I of area is used according to product, heat needed time and last Air permenbility what and decide, glued membrane after rolling is if be coated with gap filler before rolling, then carry out after-baking, make the gap filler coating layer be fused into a continuous structure again, this packaging bag also can be carried out gap filler coating and printing after rolling, Die Jia duplicature is complied with the required size of last packaging bag again at operating direction (MD) subsequently, only stay on one side and do not seal with food to be loaded, all the other each peripheral Heat Sealings form the packaging bag finished product with the last one side of cutting, last packaging bag can be made single formula packaging bag with truncation and be piled up back stand-by, also can line segment formula point side cut mode, and rewinding becomes web-like (roll type) stand-by, the bag configuration that this method makes is the packaging bag (hereinafter to be referred as the paperback bag) of thickness homogeneous, in the application of many automated food packaging bags, processing of films of the present invention can be bonded to the packaging for foodstuff board, this processing of films can be at heat sealing wherein on one side, load food immediately, then heat-sealing and fervent another side is to finish the packing of food.

Consult shown in Fig. 7 B; for pumping mode machine of the present invention by an embodiment who appoints bag Fabrication procedure flow process; production has the packaging bag of clip chain bar; producing board pumping mode machine exit under detention can have clip chain bar groove and raised line open-close type sealing strip connecting structure simultaneously and take out film extrusion nib mechanism; its extruding makes the inboard, one side of blowing bag film; have the film that groove and raised line male and female clip chain bar seal simultaneously; printing subsequently; coating; roll; heat treatment; operation such as hot-pressing, edge-sealing and side cut all with the operation shown in Fig. 7 A; prepared packaging bag be contain the clip chain bar by appointing bag; another side of clip chain bar is the superimposed corner continuous structure of a film; cut off the rim charge of the duplicature corner of stack, make to seal off at last multiple edible by appointing a bag packaging bag.

Consult shown in Fig. 7 C, Fabrication procedure's flow process for another packaging bag of the present invention, the edible material of packaging bag is single rete base material or several layers of composite film base material, before this rete enters roller compaction processes, carry out the coating of product printing or gap filler surface earlier handles in a side of base material rete, rolling in the process of film, the density that its film rolls, the degree of depth with roll area and can be comprehensive, regional area, systematicness, irregularity distributes, final consumption temperature when the big I of area is used according to product, heat needed time and last Air permenbility what and decide, glued membrane after rolling is if be coated with gap filler before rolling, then carry out after-baking, make the gap filler coating layer be fused into a continuous structure again, this packaging bag also can be carried out gap filler coating and printing after rolling, then the face-to-face adjacent state of the low melting point involution material layer of medial surface with two rete base materials is superimposed with each other, Die Jia bi base material tunic is again according to the needed size of last packaging bag subsequently, only stay on one side and do not seal, wait until filling food, all the other each peripheral Heat Sealings form last packaging bag with the last one side of cutting, the finished product packing bag can be made single formula packaging bag with truncation and pile up back stand-by, also can line segment formula point side cut mode, and rewinding becomes web-like paperback bag stand-by, in the application of many automated food packaging bags, processing of films of the present invention can be bonded to the packaging for foodstuff board, this processing of films can be at heat sealing wherein on one side, load food immediately, then heat-sealing and fervent another side is to finish the packing of food.

Consult shown in Fig. 7 D, for of the present invention another by appointing a bag Fabrication procedure flow process, the material that packaging bag eats is with Fig. 7 C used single rete base material or several layers of composite film base material, printing subsequently, coating, roll, heat treatment step is all identical, the structure that has the packaging bag of clip chain bar for production, behind heat treatment or coating and printing, then with the medial surface corresponding edge of two rete base materials respectively with the male and female clip chain sealing strip of Heat Sealing one groove and raised line, Die Jia bi base material rete is again according to the needed size of last packaging bag subsequently, only stay on one side and do not seal, wait until filling food, all the other each peripheral Heat Sealings form last packaging bag with the last one side of cutting.The film that is adjacent to clip chain bar edge is a heat-sealing osed top structure, generally when using post sales, just tears food pack, this clip chain bar has the function that repeatedly folding is used, in food automatic packaging process, this filling opening all is positioned at by on the seal edge surface side of appointing the sackholder chain, after packing board state food finishes, carry out last heat sealing in Fengkai mouth two sides not again, to finish the packing of food, the packaging bag that this manufacture method is made is to belong to folding (open) structure on clip chain bar limit, and its opposite side is the single by appointing the bag occupation mode of Heat Sealing.

The packaging bag of this structure of the present invention can be used for packing the usefulness of various food and extension, for example pack fresh carnivorous thing, frozen food, puffed rice or other article etc., these class article are put when boiling after packaging bag of the present invention by envelope, can directly utilize the micro-wave oven heating, the high-temperature vapour boiling, poach and infrared ray heating, in the process of micro-wave oven heating, the initial stage heated food is under the lower ambient temperature, encapsulation bag inner vapor pressure is also lower, air permeable wrapping bag rete and the crack on it still are to be hermetically-sealed construction, molecular vibration and frictional influence in the packed food composition of overwhelming majority microwave energy are converted into heat energy, and directly pseudo adiabatic encapsulates the even heated food of actv. in the bag, along with proceeding of heating, temperature and vapour pressure edge up in the packaging bag, when the packaging bag internal gas pressure bigger during than external atmosphere pressure to a critical value, the swollen outward support rete of encapsulation sack air pressure, crack on the sack rete is also enlarged along with being out of shape, the involution material deliquescing of gap filler layer on it, attenuation even split, the involution ability of gap filler reduces, at this moment place, crack becomes to having permeability to air, play the safety relief valve action of bag internal gas pressure when excessive simultaneously, can avoid the dangerous phenomenon that heat steam pressure in the airtight bag of the general non-permeability to air internal cause heat process excessive moment pops like this.Another characteristic of packaging bag of the present invention is, when the quilt after heating is boiled is sealed food up for safekeeping and is cooled down, driving fit and joint sealing materials also can increase the involution ability because of drop in temperature solidifies again in the crack on the bag film, and become airtight airtight structure again, gas volume in the bag also can be because of driving fit and the cooling effect contraction again of the crack on the packaging bag film, and has the effect of similar vacuum shrink wrapping.

When permeability to air of the present invention encapsulation bag is applied to pack edible article of all kinds, one of main characteristic functions is, even, the high efficiency of heating surface of short time are provided, its can prevent from simultaneously to avoid moisture or other additives in the excessive food, as compositions such as wine for cooking, sesame oil, spices, because of heating or the process of the boiling forfeiture of volatilizing for a long time, can keep the food original flavor like this, the minimizing person's of boiling worry.Frozen food permeability to air encapsulation edible of the present invention bag, do not need the preposition process of thawing, do not need to adjust different heating powers yet, eat after directly utilizing this frozen food of micro-wave oven heating with full power, sealing up for safekeeping and the freezing ice thing of suffering from indigestion of the surplus food of general family, edible this packaging bag has comfort feature, and this air permeable wrapping bag boils with packaging bag and packaging film to the micro-wave oven heating that provides easier a, lower cost in people's life and manipulate easily.

Above-mentioned food enclosed in sealed and the clinical utensil of using of medical treatment, can be as gauze, surgical instrument etc. by air permeable wrapping bag of the present invention or packaging film packing, carrying out high temperature sterilization, sterilization or ultraviolet irradiation again handles, after the high-temperature sterilization treatment cooling, utensil, the article sealed up for safekeeping, polluted by the invasion and attack of extraneous bacterium, such sterile food or aseptic utensil edible sealed the time limit up for safekeeping and can prolong greatly.

Breathing material film of the present invention can be made packings such as back of the body envelope formula bag, contained side bag, tripartite bag, vertical bag and make articles for use (back sealed bag, gadget bag, three sidesbags or standing pouches).

The material that air permeable wrapping bag provided by the invention and packaging bag are edible, overcome the problem of commonly using packaging bag and material existence thereof, the material preparation is simple and convenient, in extensive range, behind the material smokeless combustion, only generate water and carbon dioxide, there is not pollution problem, belong to feature of environmental protection material, be not subjected to the pollution of exotic after food is packed, fresh-keeping, prevent to go bad, the gas explosion phenomenon that can avoid sack to cause because of heating supercharging, suitable range of temperatures is wide, can need be with regard to packaging product heatproof demand according to food characteristic and client, specification such as size and shape is carried out optimized material and is selected and specifications design.

The above, it only is preferred embodiment of the present invention, be not that the utility model is done any pro forma restriction, every foundation technical spirit of the present invention all still belongs in the scope of technical solution of the present invention any simple modification, equivalent variations and modification that above embodiment did.

Claims (10)

1, a kind of packaging bag, it is characterized in that, constitute by the first mould layer and second rete, wherein, first rete is provided with several cracks of rolling generation, and is provided with rete for the first time, and second rete and first rete are mutually to folded, the mutual involution of several sides of the second mould layer and first rete forms the bag shape with opening.

2, packaging bag according to claim 1, it is characterized in that the described first apotype layer is selected from by propylene, polyesters, polyethylene, polypropylene, poly-thiamines, polyethylene and polyacrylic co-polymer, ethene and cinnamic co-polymer, ring-type alkene co-polymer, the poly terephthalic acid diethylester, polyvinyl alcohol, ethylene-ethyl acetate or by ionic high molecular cpd, carbowax is to naphthalate, poly ether-ketone (PEK), polycarbonate, polysulfones, polythioamine, polypropylene cyanogen, the co-polymer of styrene and propylene cyanogen, Polyurethane, synthetic paper, paraffin paper has the material of the heat sealability that can hot melt and makes.

3, packaging bag according to claim 1, it is characterized in that, the described first mould layer also is provided with one second apotype layer, this second apotype layer is positioned at a side of the first apotype layer, and this second apotype layer is selected from by propylene, polyesters, polyethylene, polypropylene, poly-thiamines, polyethylene and polyacrylic co-polymer, ethene and cinnamic co-polymer, ring-type alkene co-polymer, the poly terephthalic acid diethylester, polyvinyl alcohol, ethylene-ethyl acetate or by the ionic high molecular cpd polyethyleneterephthalate, poly ether-ketone (PEK), polycarbonate, polysulfones, polythioamine, polypropylene cyanogen, the co-polymer of styrene and propylene cyanogen, Polyurethane, synthetic paper, glass paper, the paper wood of High molecular material coating, the paper low melting point, the high melting point material is made.

4, packaging bag according to claim 3, it is characterized in that the described first mould layer also is provided with a mould layer for the third time, this for the third time the mould layer be positioned at a side of the second apotype layer, this for the third time mould layer and the first apotype layer be positioned at not homonymy, the mould layer is made by low-melting heat sealability material for the third time.

5, packaging bag according to claim 1, it is characterized in that, the surface of the described first mould layer is provided with an involution material, to insert in the crack, this involution material is selected from the material that is fine into by grease class, wetting agent, wax, aliphatic acid and derivant thereof, starch and starch-containing derivant thereof, glue and makes.

6, packaging bag according to claim 1 is characterized in that, described packaging bag opening part is provided with the binding fastening structure of a switch opening.

7, packaging bag according to claim 1, it is characterized in that, add deoxidation gas material in the described packaging bag, this deoxidation gas material is selected from the oxidizable metal material by iron, aluminium, zinc, nickel, copper, manganese, weight sodium sulfate, ferric sulfate, zinc sulphate and cmpd thereof.

8, packaging bag according to claim 5 is characterized in that, described grease class is saturated grease, unsaturation grease and hydrogenated oil and fat; Described wax is natural wax or artificial synthetic wax; Wherein natural wax material is paim wax, paraffin, micrinite wax, beeswax, rice bran wax, and artificial synthetic wax is the oxide synthetic wax of Tissuemat E, its chlorinated polypropylene wax, poly-ethoxy resin wax, artificial synthetic wax, petroleum product, Dormant oils product, polyolefins, wax.

9, packaging bag according to claim 6 is characterized in that, described binding fastening structure is sliding type zip strip, repeatedly open-close type sealing strip, adhesive tape thread gluing, super sonic pressing mode and add the hot pressing mode.

10, a kind of manufacture method of packaging bag according to claim 1, it is characterized in that, it is by preparation macromolecule membranous layer operation, roller compaction processes, painting process, hot-pressing, edge-sealing operation and side cut operation are finished, preparation rete operation comprises the single rete base material of preparation and several layers of composite film base material, roller compaction processes is macromolecule membranous layer to be rolled to make be formed with several crack area on the rete, painting process is that the involution material layer is coated on the rete that is formed with crack area, the hot-pressing, edge-sealing operation is after first rete and second rete are superimposed with each other, leave an open end, all the other side Heat Sealings become the packing bag.

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