CN102985325A - Hermetically-sealed paperboard containers with improved barrier performance - Google Patents
Hermetically-sealed paperboard containers with improved barrier performance Download PDFInfo
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- CN102985325A CN102985325A CN2010800681614A CN201080068161A CN102985325A CN 102985325 A CN102985325 A CN 102985325A CN 2010800681614 A CN2010800681614 A CN 2010800681614A CN 201080068161 A CN201080068161 A CN 201080068161A CN 102985325 A CN102985325 A CN 102985325A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
- B65D3/22—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines with double walls; with walls incorporating air-chambers; with walls made of laminated material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31C—MAKING WOUND ARTICLES, e.g. WOUND TUBES, OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31C1/00—Making tubes or pipes by feeding at right angles to the winding mandrel centre line
- B31C1/06—Making tubes or pipes by feeding at right angles to the winding mandrel centre line and inserting into a tube end a bottom to form a container
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B29/00—Layered products comprising a layer of paper or cardboard
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
- B65D77/10—Container closures formed after filling
- B65D77/20—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers
- B65D77/2024—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers the cover being welded or adhered to the container
- B65D77/2028—Means for opening the cover other than, or in addition to, a pull tab
- B65D77/2032—Means for opening the cover other than, or in addition to, a pull tab by peeling or tearing the cover from the container
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Abstract
A hermetically-sealed paperboard container is disclosed that may be produced using a conventional converting machine but at a converting temperature of at least 93o C lower than a conventional converting temperature. The formation of pin holes or rupture on the barrier structure during the converting process can be significantly reduced, resulting in the hermetically-sealed paperboard container with enhanced barrier performances.
Description
Background of invention
Paper-based containers with barrier layere character is generally formed by the paper substrate blank that comprises pressboard substrate and functionalization layer (for example, oxygen barrier layers and moisture blocking layer).Blank is die-cut to the profile of expectation, then by once forming shape around the mandrel parcel.The overlapping ends of blank forms has the straight seam of lower part and upper part.Fig. 1 shows that the end by blank 101 is overlapped into the cross sectional drawing of the container body 100 that straight seam with lower part 102 and upper part 103 makes.The burr 104 of the lower part of seam are exposed to container contents, cause weakening the barrier performance of container.Reported that burr 104 that several technology prevent seam are exposed to the content of packing.
A kind of method is the exposure burr that cover blank with a barrier layere band.Comprise PET, nylon and the combination thereof of metallic paper (for example aluminium foil and tinfoil paper), Low Density Polyethylene (LDPE), ethylene-vinyl alcohol copolymer (EVOH), polyethylene terephthalate (PET), glycol modification as the example of the known materials of the burr of barrier layere band protection cardboard packaging.US Patent 5,620,135 openly use the technology of the burr of protectiveness cover tape nappe (body).PCT application WO 2003/106277 discloses a kind of single wrapping container, and described container has the lower edge by the exposure of the paper-based containers body of band sealing, and this band comprises the metallization pet layer that is inserted between the LDPE layer.Yet covering burr with boundary belt has several defectives.The boundary belt that adheres to is fringe cost, and can remove easily.In addition, need other process to use boundary belt, cause the cost of manufacturing process and complexity further to increase.
Another kind of method commonly used is that the partially folded one-tenth of the lower edge of barrier liner layer " boa formula " is folding in the multilayer tubular container processes, and wherein self is gone back in following edge, and is adhered to upper edge.A this folding example is illustrated in US Patent 5,084,284.The folding major defect of boa formula is the increase that seam caliper is not expected, because it is three times of sotck thinkness.This high thickness tends to form crackle, causes the barrier performance of content seepage, extraneous air inflow and container to reduce.In addition, during to container body, this high thickness of not expecting of seam causes difficulty in the end of attempting airtight container body itself and top pressure closure and bottom.To form the difficulty in the fan-fold paper based blank during the container body in order solving, to have reduced the thickness of blank with few techniques.
US Patent 6,190,485 openly need not " boa formula " folding sealing screw winding laminated vessel of making.Yet the method is based on the continuous net width of cloth that uses ply of board and laying, and this needs quite intensive processing, relatively high transportation and storage cost.
The another kind of method of the burr of protection blank is " cutting and crimping ", and such as US Patent 5,236,408 is described.Cutting is half from side seams sheet removal cal(l)iper.Crimping be with the zone of cutting go back to from it, and by heating or flame at another edge of sealing, the zone of crimping.For the manufacture of the gable top carton that is used for flexible package punch industry, such as US Patent 5,810,243 is described for the method.Although the burr of the vertical side seam of cardboard case are protected, need to use the special seal technology of sealing pincers, as described in International Patent Application WO 2008/025996 and WO 1990/009926, with sealed folded top flat and egative film, thereby finish the sealing cardboard case.
Finish hermetic barrier layers paper board cups difficulty at paper board cups formation machine with " cutting and crimping " method, paper board cups forms machine and generally is designed to make the liquid-tight container with top that is not for the gas tight seal design.In the zone of thick cutting/bottom, lock seam contact overlapping region, make sealed bottom at the thickness of the increase in original cardboard cutting/curled edges zone other challenge is provided.The seam essence of the top that cutting edge also forms at the overlapping end by blank increases precipitous step, and the shape surface, on-plane surface hills at edge makes the sealing of sealed membrane (film or paper) more difficult.
UK Patent Application 2055743 discloses a kind of paper-based containers, the top cover at the spill top that described container is included in hollow body body that top and bottom have concave structure, be positioned at container body and be positioned at the bottom of concave bottom.By to preset width with one of the paper substrate blank vertical end be cut to its thickness in fact half, then essence is formed centrally longitudinal fluting in cutting tip, makes the hollow body body.Heat-resistant adhesive is applied to cutting tip, and uses infrared radiation, to evaporate the water that wherein comprises.Then at groove folded around cutting tip, so as the end face of cutting paper and not the end face of cutting tip be in contact with one another.Yet, owing to use the concave structure of adhesives and top and bottom, make this process very complex and expensive of barrier container.
Until the disclosure is understood according to the contriver, do not use adhesives not finish the hermetic barrier layers paper board cups at the cup-shaped one-tenth machine of routine in industrial usefulness " cutting/crimping/flame sealing " method always.
Therefore, still need to have the barrier layere of raising and the sealing cardboard packaging of sealing property, this container can pass through more effective and economic method manufacturing, and described method uses commercially available high-speed liquid packing cutting/crimping/water-tight equipment to become machine and do not use adhesives with cup-shaped.An advantage of this method is the possibility of system in the equipment, and wherein the blank of cutting can be put down and be transported to packaging facilities, forms the barrier layere cup with cup-shaped one-tenth machine in the equipment there.
Useful is to produce the sealing cardboard packaging with excellent barrier performance that does not need to give with metallic paper barrier layere character in addition.
Summary of the invention
The present invention discloses a kind of sealing cardboard packaging, and described container can be with conventional interpreter but is being lower than the inversion temperature manufacturing of at least 93 ℃ of conventional inversion temperatures.During switching process, form pin hole or break and significantly to reduce at barrier layer structure, obtain having the sealing cardboard packaging that strengthens barrier performance.
The accompanying drawing summary
Fig. 1 shows the cross sectional drawing of the cardboard packaging body of prior art, and wherein the overlapping end of blank forms seam with the burr that are exposed to the packing content thing.
Fig. 2 shows the example of the general multilayer barrier layer structure that is used to form the cardboard packaging with barrier performance.
Fig. 3 shows an embodiment of disclosed multilayer barrier layer structure.
Fig. 4 shows the scheme drawing of container body formation, and wherein the folding vertical end of blank is overlapping in another vertical end of blank, to form side seams; With
Fig. 5 shows an embodiment of disclosed sealing cardboard packaging, and described container is included in the upper end to have turned rim and have container body assembly, top cover and the base assemblies of concave structure in the lower end.
Detailed Description Of The Invention
Below describe more fully the disclosure, but may not show all embodiments of the present disclosure.Although the reference example embodiment has been described the disclosure, those skilled in the art will recognize that and to carry out various variations under the scope of the present disclosure not breaking away from, and available equivalents replaces its key element.In addition, can make a lot of modifications under the base region of the present disclosure not breaking away from, so that particular case or material adapt to instruction of the present disclosure.
The multilayer barrier layer material
Fig. 2 shows the general multilayer material for the manufacture of the container with barrier performance
AExample.Pressboard substrate 1A one side scribbles sealant layer 2A, and opposite side has barrier layer structure, and barrier layer structure comprises Low Density Polyethylene (LDPE) poly-mer 3A, barrier polymers 4A and binder course 5A.Then, one deck sealant layer 6A is applied on the surface of binder course 5A.When expectation, can by coextrusion LDPE poly-mer 3A, EVOH poly-mer 4A and binder course A5, barrier layer structure be applied on the pressboard substrate 1A.
Yet the airtight container that forms from the multiple-structure of Fig. 2 generally shows not enough barrier performance, for example oxygen barrier layers to different final use packaging applications.This is owing to the pin hole in the barrier layer structure that forms during multiple-structure converts the process of container to or breaks.Therefore, the container of formation shows high oxygen permeability, and is high to not satisfying general 12 to 18 months required pot-life targets of sealed package application.Forming pin hole or break may be because the excessive temperature that uses during cup-shaped one-tenth (that is, conversion) process separates the film rupture that causes with the sealed bottom that causes owing to cardboard memory.
Multilayer material of the present disclosure allows converting the process of airtight container to the more much lower range of temperatures of standard handovers temperature, the formation that therefore reduces during switching process pin hole in the barrier layer structure or break.The multilayer barrier layer structure that can expose in one embodiment, converts airtight container to being lower than standard handovers temperature 200 ℉ (93 ℃).During switching process, form pin hole and break and to reduce, obtain having the airtight container that improves barrier performance.In addition, disclosed multilayer barrier layer material can provide improved hot sticky intensity and total bind strength.
Disclosed multilayer barrier layer material can be designed to the barrier performance for the airtight container of different packing final use optimizing application formation.For improved barrier layer for gases performance, oxygen barrier layers for example, barrier layer structure can be designed to have some other barrier performance such as water vapor barrier layer performance.
Disclosed barrier layere multilayer material comprises:
(a) has the base material of the first side and the second side;
(b) be positioned at sealant layer on base material the first side; With
(c) be positioned at the barrier layer structure that contains on base material the second side, wherein contain barrier layer structure and comprise at least:
(i) barrier material layer; With
(ii) be positioned on the barrier material layer comprise special-purpose low melting point based on poly poly-mer the layer, described special use has 0.75g/cm based on poly poly-mer
3To 1.00g/cm
3Density, and 80 ℃ to 120 ℃ fusing point.
Have the density of aforementioned range and the special-purpose low melting point that is fit to of fusing point character and can include but not limited to very low density polyethylene (VLDL) (VLDPE), ion polyethylene and ethylene copolymers and combination thereof based on poly poly-mer.
VLDPE is known as the essence line style PE poly-mer with high-level short chain branch by those skilled in the art, generally by ethene and short chain alhpa olefin copolymerization preparation.The VLDPE poly-mer is generally with 0.880-0.915g/cm
3Density range be feature.
In one embodiment, special-purpose low melting point can be for having 0.880 g/cm based on poly poly-mer
3To 0.915g/cm
3Density and the very low density polyethylene (VLDL) of 80 ℃ to 120 ℃ fusing point.
In one embodiment, special-purpose low melting point can be the ion polyethylene and ethylene copolymers based on poly poly-mer.The example of these copolymers includes but not limited to available from the SURLYN ethylene/methacrylic acid poly-mer of Dupont, for example to have 0.94g/cm
3The SURLYN 1652 of density and 100 ℃ of fusing points.
Those skilled in the art will recognize that VLDPE and SURLYN ethylene/methacrylic acid poly-mer are only open as an example, in the disclosure, can easily use have regulation density and melting range other based on poly poly-mer.
In one embodiment, contain that barrier layer structure is finished and then be positioned on the surface of base material, this available different known applying method reaches.These applying methods can include but not limited to gluing sandwich.
Each layer assembly that in one embodiment, will contain barrier layer structure is coextruded on the surface of base material.
Each layer assembly that in one embodiment, will contain barrier layer structure is applied on the surface of base material in order.
Should be appreciated that can make by any technology that applies that other is fit to contain on the surface that barrier layer structure is positioned at base material, aforementioned three embodiments only are example.
Fig. 3 shows an embodiment of disclosed multilayer barrier layer material.Multilayer material
BComprise base material 1B; Be positioned at the first sealant layer 2B on base material one side; Be positioned at the barrier layer structure that contains on the base material opposite side; And optional at base material 1B with contain binder course 7B between the barrier layer structure 3B.The optional barrier layer structure that contains can comprise further that PE-polymeric layer, binder course and gluing binder course are one of at least.
(I) contain barrier layer structure
Be illustrated in Fig. 3 and be applicable to an embodiment that contains barrier layer structure of the present disclosure.Contain barrier layer structure 3B and comprise that polymeric layer 4B, barrier material layer 5B based on PE and special-purpose low melting point are based on poly polymeric layer 6B.
In one embodiment, the gross thickness that contains barrier layer structure 3B is about 2.0 mil to 4.0 mils.In one embodiment, its thickness is about 3.0 mils.
The barrier material layer
Can in the disclosure, use multiple barrier material, its selection to depend on the barrier performance level of expectation.Material and combination thereof that the example of the barrier material that is fit to includes but not limited to ethylene-vinyl alcohol copolymer (EVOH), nylon, polyethylene terephthalate (PET), polyamide, polyvinylidene chloride, cyclic olefine copolymer, metallized polymeric film, derives from water base barrier coating.Can be in the disclosure provide barrier layere with the multiple water base barrier coating that becomes known for giving cardboard barrier layere character.When expectation, water base barrier coating can comprise nano particle, stops the diffusion molecule by the complications impact of coating to provide.In addition, can optimize the thickness of barrier polymers layer, be fit to the barrier performance that selected final use is used to provide.
In one embodiment, EVOH can be used as barrier material and is used for 5B, and its layer thickness adapts to and satisfies in 23 ℃ of temperature and 0% relative humidity less than 10cc/100 in
2The oxygen barrier layers performance of/atm/ days expectation.In one embodiment, evoh layer thickness is in the scope of 0.25 mil to 0.75 mil.In one embodiment, evoh layer thickness is in the scope of 0.25 mil to 0.50 mil.In one embodiment, evoh layer thickness is in the scope of 0.25 mil to 0.40 mil.
Comprise special-purpose low melting point based on the layer of poly poly-mer
In one embodiment, the special-purpose low melting point that comprises in the layer 6B that contains barrier layer structure 3B of Fig. 3 has about 80 ℃ to 120 ℃ fusing point based on poly poly-mer.In one embodiment, special-purpose low melting point has about 100 ℃ to 110 ℃ fusing point based on poly poly-mer.
The low melting point that is fit to aforementioned range density and fusing point character can include but not limited to very low density polyethylene (VLDL) (VLDPE), ion polyethylene and ethylene copolymers and combination thereof based on poly poly-mer.
The thickness of this 6B layer can be about 0.75 mil to 2.0 mil, that is, and and about 19mm to 50mm.In one embodiment, the thickness of this layer can be about 1.0 mil to 1.6 mils.
The optional layer based on the PE poly-mer
In when expectation, contain barrier layer structure and can further comprise layer (shown in 4B among Fig. 3) based on the PE poly-mer.
In one embodiment, be linear low density polyethylene (LLDPE) (LLDPE) based on the poly-mer 4B of PE, its layer thickness adapts to the expected performance that satisfies final multilayer barrier layer structure.In one embodiment, its thickness is 1.00 mil to 1.60 mils.In one embodiment, its thickness is 1.20 mil to 1.30 mils.
(II) sealant layer
The aquaseal poly-mer that is fit to that is used for 2B layer of the present disclosure can include but not limited to polyester; Low Density Polyethylene (LDPE); High density polyethylene (HDPE) (HDPE); Vinyl-vinyl acetate copolymer (EVA); Ethylene-methyl acrylate (EMA) copolymer; Ionomer is such as ethylene-methacrylic acid copolymer (EMAA) the copolymer SURLYN available from DuPont; And combination.
(III) base material
For the body assembly of disclosed airtight container, available multiple cardboard is as base material.These include but not limited to coated natural kraft board (CNK cardboard), solid bleached sulfate cardboard (SBS), solid not bleached sulphate cardboard (SUS), apply Reclaimed board (CRB), apply white background chipboard (WLC), folded box cardboard (FBB) and be applicable to cup-shaped other board grades that becomes.
For cap assemblies or bottom component, the available various base materials of packaging applications that become known for are as base material.The example of these base materials includes but not limited to paper base material such as cardboard; Plastics; Paper tinsel sill such as aluminium foil; Metalized film; And combination.
(IV) binder course (choosing wantonly)
Randomly, disclosed multilayer barrier layer material B can comprise at base material 1B and contain binder course 7B between the barrier layer structure 3B.Can in the disclosure, use any known binder course material.When expectation, this optional binder course can be gluing binder course.In one embodiment, use the binder course of choosing wantonly based on the poly-mer conduct of PE.The example of this poly-mer based on PE that is applicable to the 7B layer can include but not limited to Low Density Polyethylene (LDPE), high density polyethylene (HDPE) (HDPE) and combination thereof.In one embodiment, the 7B layer is made by the LDPE poly-mer.
The formation of body assembly
Disclosed multilayer barrier layer material is die-cut to the profile of expectation, comprises the first vertical end and the second vertical blank of holding to provide.For preset width, first of blank is indulged end-grain cutting be whittled into predetermined thickness.Then the cutting end of the blank that heat treatment obtains folds and seals at blank, so that the first folding vertical end to be provided.
As shown in Figure 4, by two vertical ends of overlapping blank, so that the first folding vertical end 401 subsequently with overlapping joint seal, forms container body assembly 400 in the second vertical end 402.
Cap assemblies
Cap assemblies can be derived from for the selected final use of airtight container and use any material with suitable barrier layere character.
In one embodiment, cap assemblies comprises plastics; Paper tinsel sill such as aluminium foil; Metalized film; And combination.
In one embodiment, cap assemblies comprises base material and is positioned at least one lip-deep barrier material layer of base material.
In one embodiment, cap assemblies comprises:
(a) base material; With
(b) be positioned at least one lip-deep barrier layer structure that contains of base material, the described barrier layer structure that contains comprises:
(i) barrier material layer; With
(ii) be positioned on the barrier material layer comprise special-purpose low melting point based on poly poly-mer the layer, described special use has 0.75g/cm based on poly poly-mer
3To 1.00g/cm
3Density, and 80 ℃ to 120 ℃ fusing point.
Have the density of aforementioned range and the special-purpose low melting point that is fit to of fusing point character and can include but not limited to very low density polyethylene (VLDL) (VLDPE), ion polyethylene and ethylene copolymers and combination thereof based on poly poly-mer.
The suitable base material that is used for cap assemblies can include but not limited to paper base material such as cardboard; Plastics; Paper tinsel sill such as aluminium foil; Metalized film; And combination.
In an embodiment of the present disclosure, cap assemblies comprises cardboard, at least one lip-deep barrier material of cardboard or contain the layer of barrier layer structure and be positioned at barrier material or contain sealant layer on the layer of barrier layer structure.
When expectation, cap assemblies can be made by identical with the body assembly or similar material.
Available several methods is sealed to the body assembly with cap assemblies.The example of these sealings includes but not limited to seal the top with plastic edge; Progressively reducing the zone bead of sealant material that drips; Before adding a cover, the bead of sealant material is added to whole top; Utilize the cover material that adds of resealing agent, for example, those that are used for the hermetic barrier layers dish add epiphragma; Than high sealing pressure, add cover material the edge is flattened to depress, be used for to greatest extent sealing; And combination.
Base assemblies
Base assemblies can be derived from for the selected final use of airtight container and use any material with suitable barrier layere character.
In one embodiment, base assemblies comprises plastics; Paper tinsel sill such as aluminium foil; Metalized film; And combination.
In one embodiment, base assemblies comprises base material and at least one the lip-deep barrier material layer that is positioned at base material.
In one embodiment, base assemblies comprises:
(c) base material; With
(d) be positioned at least one lip-deep barrier layer structure that contains of base material, the described barrier layer structure that contains comprises:
(i) barrier material layer; With
(ii) be positioned on the barrier material layer comprise special-purpose low melting point based on poly poly-mer the layer, described special use has 0.75g/cm based on poly poly-mer
3To 1.00g/cm
3Density, and 80 ℃ to 120 ℃ fusing point.
The special-purpose low melting point that is fit to aforementioned range density and fusing point character can include but not limited to very low density polyethylene (VLDL) (VLDPE), ion polyethylene and ethylene copolymers and combination thereof based on poly poly-mer.
The suitable base material that is used for base assemblies can include but not limited to paper base material such as cardboard; Plastics; Paper tinsel sill such as aluminium foil; Metalized film; And combination.
In an embodiment of the present disclosure, base assemblies comprises cardboard, at least one lip-deep barrier material of cardboard or contain the layer of barrier layer structure and be positioned at barrier material or contain sealant layer on the layer of barrier layer structure.
When expectation, base assemblies can be made by identical with the body assembly or similar material.
By the cross cutting coiled strip, be then assembled to lower end and the sealing of body assembly, can form base assemblies.
In one embodiment, by around base assemblies inclusion enclave assembly, the body assembly is engaged with base assemblies.In when expectation, be used for base assemblies coiled strip can for the used identical multiple-structure of body assembly.
Can the bottom be assembled into the body assembly by various packing techniquies.The example of this sealing can include but not limited to hot air heat-sealing and ultrasonic sealing.Can be according to different factors optimization seal process.Some of these factors include but not limited to the thickness of the sealant layer on the bottom; And treatment conditions, for example than low seal temperature, to prevent from forming pin hole; With than high sealing pressure, so that the gap between bottom and the body assembly forms and to minimize.
Form airtight container
Behind the organizator assembly, but the structure of the top and bottom of tectosome, with the sealing of support with the lid and bottom parts.Can use any known structure of the top and bottom that are used for container body in the disclosure, the container package application of expectation is depended in the selection of these structures.The example of structure that is used for the top and bottom of container body can include but not limited to concave structure, upset crimping, flange and combination thereof.
Application standard cup interpreter, and by careful selection and control switching process condition, for example seal time, temperature and pressure, the multilayer barrier layer material that can expose converts to has the airtight container that improves barrier performance.
General cup-shaped one-tenth machine is formed station, the width of cloth charging of bed material net and cross cutting, crimping station, delivery system and packing/check post and is formed by blank feed system, heater element, disc type transmission.Heater element provides control heat process, with the activation sealant layer.Heater element is applied to the side seams of container body assembly, also is used for the sealing between container body assembly and the cup base assemblies.General method of heating are that hot air is blown to selected structural region by a plurality of nozzles.Yet, available other method of heating activation aquaseal, for example, infrared heating.The temperature altitude of the hot air that the activation aquaseal is required depends on the speed (namely sealing the time) of aquaseal composition and machine.
Disclosed sealing cardboard packaging with enhancing barrier performance comprises:
(A) body assembly, described body assembly comprise upper end, lower end and cutting-crimping side seal, and wherein the body assembly is formed by the multilayer barrier layer material, and described multilayer barrier layer material comprises:
(a) has the cardboard of the first side and the second side;
(b) sealant layer on base material the first side; With
(c) be positioned at the barrier layer structure that contains on cardboard the second side, wherein contain barrier layer structure and comprise:
(i) barrier material layer; With
(ii) be positioned on the barrier material layer comprise special-purpose low melting point based on poly poly-mer the layer, described special use has 0.75g/cm based on poly poly-mer
3To 1.00g/cm
3Density, and 80 ℃ to 120 ℃ fusing point;
(B) be sealed to the base assemblies of body assembly lower end; With
(C) be sealed to the cap assemblies of body assembly upper end.
In one embodiment, base assemblies and cap assemblies are made by the multilayer barrier layer material identical with the body assembly one of at least.
In one embodiment, base assemblies and cap assemblies are one of at least by comprising that following material makes: paper base material such as cardboard; Plastics; Paper tinsel sill such as aluminium foil; Metalized film; And combination.
In one embodiment, base assemblies and cap assemblies are made by the multilayer barrier layer material one of at least, and described multilayer barrier layer material comprises:
(a) has the base material of the first side and the second side;
(b) sealant layer on base material the first side; With
(c) be positioned at the barrier layer structure that contains on base material the second side, wherein contain barrier layer structure and comprise:
(i) barrier material layer; With
(ii) comprise the special-purpose low melting point that is positioned on the barrier material layer based on the layer of poly poly-mer, described special use has 0.75g/cm based on poly poly-mer
3To 1.00g/cm
3Density, and 80 ℃ to 120 ℃ fusing point.
The example of base material includes but not limited to paper base material such as cardboard; Plastics; Paper tinsel sill such as aluminium foil; Metalized film; And combination.
The method of making sealing cardboard packaging of the present disclosure comprises following steps:
(1) make a kind of multilayer barrier layer material, being characterized as of described material:
(a) has the cardboard of the first side and the second side;
(b) the first sealant layer on cardboard the first side,
(c) be positioned at the barrier layer structure that contains on cardboard the second side, wherein contain barrier layer structure and comprise:
I. barrier material layer; With
Ii. be positioned on the barrier material layer comprise special-purpose low melting point based on poly poly-mer the layer, described special use has 0.75g/cm based on poly poly-mer
3To 1.00g/cm
3Density, and 80 ℃ to 120 ℃ fusing point;
(2) the multilayer barrier layer material is cut into the profile of expectation, comprises the first vertical end and the second vertical blank of holding to provide;
(3) for preset width, first of blank is indulged end-grain cutting be whittled into predetermined thickness;
(4) cutting portion of blank given heat;
(5) cutting tip with blank folds on the blank, so that the first vertical end of collapsible blank;
(6) with two of blank vertical ends with overlapping relation crimping together, the first folding vertical end is characterized as the container body assembly of top and bottom with formation in the second vertical end;
(7) provide base assemblies;
(8) base assemblies is assembled into the lower end of container body assembly;
(9) provide cap assemblies; And
(10) cap assemblies is sealed to the upper end of container body assembly.
Fig. 5 shows an embodiment of disclosed sealing cardboard packaging.Container 500 comprises body assembly 501, cap assemblies 502 and base assemblies 503.The upper end of body 501 is climbed over, and with formation crimping or flange 504, and the bottom of body 501 is configured to concave structure 505.To the upper end of body 501, this provides adhesion at contact point 506 to cap assemblies 502 between the sealant layer 501B of the sealant layer 502B of cap assemblies 502 and body 501 at the treatment conditions lower seal.Base assemblies 503 is placed and is sealed in the female end of body 501, in order between the sealant layer 501B of the sealant layer 503B of base assemblies 503 and body 501, at contact point 507 adhesion is arranged, and aquaseal is filled any gap 507 between base assemblies 503 and the body 501 fully.
Disclosed sealing cardboard packaging is from the flat blank manufacturing of cardboard with functional coating, rather than the continuous net width of cloth of the ply of board of functionalization layer and internal layer is made.The flat blank that uses in the disclosure can flatly transport and store, and therefore, stores and traffic cost owing to reduce, and can reach essence and save.In addition, owing to the compactedness of flat blank, can significantly promote to make the treatment effeciency of production period.
Disclosed airtight container has good barrier performance, and the manufacturing of available standards cup interpreter, no matter is circle or noncircular vessel.
Application standard cup interpreter, and by careful selection and control switch condition, for example seal time, temperature and pressure, the multilayer barrier layer material that can expose converts to has the airtight container that improves barrier performance.
Table 1 is presented at the temperature that forms the required hot air of preheating and heated sealant agent layer before the airtight container.Use conventional cup-shaped one-tenth machine, with multilayer barrier layer material (being an embodiment of the present disclosure) the formation seal cup of Fig. 3.For discloseder airtight container is compared required inversion temperature with conventional vessel, the multilayer material of Fig. 2 of usefulness barrier layere packaging applications normal operation in contrast.In addition, tested the pin hole of the container that forms.Make the orchil Solution Dispersion in the container that forms, and make it to flow along sealed bottom.After 5 minutes, the water clean container, then pin hole is identified as red staining.
Table 1
The general temperature required with the standard handovers process compares, and disclosed multilayer barrier layer structure allows lower inversion temperature.Table 1 shows that when replacing general multilayer material with disclosed multilayer barrier layer material, inversion temperature can reduce at least about 200 ℉ (93 ℃).In addition, the amount of the pin hole that forms during the switching process of disclosed multilayer barrier layer structure reduces (if not eliminating fully), and this may be because the lower inversion temperature more required with the standard handovers temperature.Known excessive heat causes pin hole in multiple-structure during cup-shaped one-tenth process.
The barrier performance test
The oxygen barrier layers performance of disclosed hermetic barrier layers container is according to oxygen permeability (OTR) mensuration 23 ℃ and 0% relative humidity.To be sealed with aluminum foil cover by the container that disclosed body assembly and base assemblies are made.Then, will cover with the entrance and exit copper pipe and penetrate, and seal with hot melt adhesive.Entrance is connected to the nitrogen supply (NS) that the 10cc/min flow velocity arranges.Outlet is connected to oxygen detector.Take readings is as the OTR value, until the oxygen level reaches stability constant.
In an example, the hermetic barrier layers container of being made by the multiple-structure of Fig. 2 can provide 0.22cc/100 in
2/ atm/ days OTR.Yet the level according to inversion temperature and the pin hole that forms during switching process subsequently can not as one man reach this low OTR performance.On the other hand, the disclosed hermetic barrier layers container of making from the multiple-structure of Fig. 3 as one man provides and is lower than 0.22cc/100 in
2/ atm/ days OTR.In addition, can obtain having the hermetic barrier layers container of the OTR performance that more strengthens.Use for some final uses, can obtain having less than 0.10cc/100 in
2The disclosed hermetic barrier layers container of/atm/ days OTR.In one embodiment, but transformation process and multilayer barrier layer material have 0.01-0.10cc/100 in to provide
2The hermetic barrier layers container of/atm/ days OTR scope.In one embodiment, disclosed hermetic barrier layers container has 0.008-0.056/100 in
2/ atm/ days OTR scope.
Disclosed sealing cardboard packaging provides good barrier performance, and does not need metallic paper or crown cap to give barrier layere character.
The barrier performance of disclosed container can reach the good level identical with composite tanks, provides simultaneously light weight and the benefit of effective transportation of being caused by overlapping property.
Disclosed hermetic barrier layers container is suitable as the packing of various article.The example of these article includes but not limited to fast food, sweet food, soup, freezing ready meal and meat.
Although described the disclosure with reference to different specific embodiments, should be appreciated that, can in the spirit and scope of described inventive concept, make many variations.The disclosure is intended to be not limited to described embodiment, but has the complete scope that is limited by following claim language.
Claims (20)
1. one kind seals cardboard packaging, and described container comprises:
(A) body assembly, described body assembly comprise upper end, lower end and cutting-crimping side seal, and wherein the body assembly is formed by the blank of multilayer barrier layer material, and described multilayer barrier layer material comprises:
(a) have the cardboard of the first side and the second side,
(b) sealant layer on cardboard the first side,
(c) be positioned at the barrier layer structure that contains on cardboard the second side, the described barrier layer structure that contains comprises:
I. barrier material layer; With
Ii. be positioned at and comprise special-purpose low melting point based on the layer of poly poly-mer on the barrier material layer, wherein the special-purpose 0.75g/cm that is characterized as based on poly poly-mer
3To 1.00g/cm
3Density, and 80 ℃ to 120 ℃ fusing point;
(B) be sealed to the base assemblies of body assembly lower end; With
(C) be sealed to the cap assemblies of body assembly upper end.
2. the container of claim 1 wherein comprises special-purpose low melting point based on layer thickness with 0.75 mil to 2.0 mil of poly poly-mer.
3. the container of claim 1, wherein special-purpose low melting point comprises having 0.880g/cm based on poly poly-mer
3To 0.915g/cm
3Density and the very low density polyethylene (VLDL) of 80 ℃ to 120 ℃ fusing point.
4. the container of claim 1, wherein special-purpose low melting point comprises the ion polyethylene and ethylene copolymers based on poly poly-mer.
5. the container of claim 1 is characterized by its inversion temperature and is lower than to be made but contained barrier layer structure by the blank of identical multilayer material and does not have special-purpose low melting point based at least 93 ℃ in the container of poly poly-mer.
6. the container of claim 1, wherein sealant layer comprises the material that is selected from polyester, linear low density polyethylene (LLDPE) (LLDPE), Low Density Polyethylene (LDPE), high density polyethylene (HDPE) (HDPE), vinyl-vinyl acetate copolymer (EVA), ethylene-methyl acrylate (EMA), ionomer and combination thereof.
7. the container of claim 1, wherein barrier material comprise the material that is selected from derived from ethylene-ethenol copolymer (EVOH), nylon, polyethylene terephthalate (PET), polyamide, polyvinylidene chloride, cyclic olefine copolymer, metallized polymeric film, derived from the material of water base barrier coating and the member of combination thereof.
8. the container of claim 1, the wherein thickness of the layer of barrier material with 0.25 mil to 0.75 mil.
9. the container of claim 1, wherein contain barrier layer structure with the surface that comprises special-purpose low melting point opposite barrier material layer based on poly polymeric layer on further comprise other based on poly polymeric layer.
10. the container of claim 9 comprises the member who is selected from linear low density polyethylene (LLDPE) (LLDPE), Low Density Polyethylene (LDPE), high density polyethylene (HDPE) (HDPE) and combination thereof wherein in addition based on poly poly-mer.
11. the container of claim 1 wherein contains the thickness that barrier layer structure has 2.0 mil to 4.0 mils.
12. the container of claim 1 wherein contains the pre-formed structure of being characterized as of barrier layer structure.
13. the container of claim 1, each layer that wherein contains barrier layer structure places on the second side of cardboard in order.
14. the container of claim 1, wherein the multilayer barrier layer material further comprises in cardboard the second side and contains binder course between the barrier layer structure.
15. the container of claim 1, wherein base assemblies and cap assemblies comprise one of at least:
(a) has the base material of the first side and the second side;
(b) sealant layer on base material the first side; With
(c) be positioned at the barrier layer structure that contains on base material the second side, the described barrier layer structure that contains comprises:
I. barrier material layer; With
Ii. be positioned at and comprise special-purpose low melting point based on the layer of poly poly-mer on the barrier material layer, wherein the special-purpose 0.75g/cm that is characterized as based on poly poly-mer
3To 1.00g/cm
3Density, and 80 ℃ to 120 ℃ fusing point.
16. the container of claim 15, wherein base material comprises a member who is selected from paper base material, plastics, paper tinsel sill, metallized film and combination thereof.
17. the container of claim 1, wherein base assemblies and cap assemblies are made by the multilayer barrier layer material identical with the body assembly one of at least.
18. the container of claim 1, wherein base assemblies and cap assemblies are one of at least derived from the material that comprises the member who is selected from plastics, paper tinsel sill, metallized film and combination thereof.
19. the container of claim 1 is characterized by in 23 ℃ of temperature and 0% relative humidity less than 0.22cc/100 in
2/ atm/ days oxygen permeability.
20. a method of making the sealing cardboard packaging, described method comprises following steps:
(1) make the multilayer barrier layer material, described material comprises:
(a) have the cardboard of the first side and the second side,
(b) sealant layer on cardboard the first side,
(c) be positioned at the barrier layer structure that contains on cardboard the second side, the described barrier layer structure that contains comprises:
I. barrier material layer; With
Ii. be positioned at and comprise special-purpose low melting point based on the layer of poly poly-mer on the barrier material layer, wherein the special-purpose 0.75g/cm that is characterized as based on poly poly-mer
3To 1.00g/cm
3Density, and 80 ℃ to 120 ℃ fusing point;
(2) the multilayer barrier layer material is cut into the profile of expectation, comprises the first vertical end and the second vertical blank of holding to provide;
(3) for preset width, first of blank is indulged end-grain cutting be whittled into predetermined thickness;
(4) cutting portion of blank given heat;
(5) cutting tip with blank folds on the blank, so that the first vertical end of collapsible blank;
(6) with two of blank vertical ends with overlapping relation crimping together, the first folding vertical end is characterized as the container body assembly of top and bottom with formation in the second vertical end;
(7) provide base assemblies;
(8) base assemblies is assembled into the lower end of container body assembly;
(9) provide cap assemblies; And
(10) cap assemblies is sealed to the upper end of container body assembly.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/US2010/035704 WO2010135613A1 (en) | 2009-05-21 | 2010-05-21 | Hermetically sealed paperboard containers with enhanced barrier performance |
| USPCT/US2010/035704 | 2010-05-21 | ||
| PCT/US2010/057005 WO2011146087A1 (en) | 2010-05-21 | 2010-11-17 | Hermetically-sealed paperboard containers with improved barrier performance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102985325A true CN102985325A (en) | 2013-03-20 |
Family
ID=43566698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010800681614A Pending CN102985325A (en) | 2010-05-21 | 2010-11-17 | Hermetically-sealed paperboard containers with improved barrier performance |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2571772A1 (en) |
| CN (1) | CN102985325A (en) |
| WO (1) | WO2011146087A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106458417A (en) * | 2014-04-03 | 2017-02-22 | 普林特帕克伊利诺伊公司 | Thermoforming sheets and thermoformed containers prepared therefrom |
| CN108860888A (en) * | 2018-08-29 | 2018-11-23 | 刘文钦 | One kind can strengthen the design of dixie cup crimped lid conjunction |
| CN112978003A (en) * | 2019-12-16 | 2021-06-18 | 昭和电工包装株式会社 | Cup-shaped container and method for manufacturing same |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120298733A1 (en) * | 2010-05-21 | 2012-11-29 | Qihua Xu | Hermetically Sealed Paperboard Container |
| FI20185757A1 (en) | 2018-09-11 | 2020-03-12 | Ch Polymers Oy | A method for sealing paperboard |
| DE102018009938A1 (en) * | 2018-12-20 | 2020-06-25 | Ipe Schropp Gbr (Vertretungsberechtigter Gesellschafter Joachim Schropp, 74831 Gundelsheim) | Container made of grass paper |
| CA3190850A1 (en) * | 2020-08-27 | 2022-03-03 | Dirk HATJE | Container assemblies with paper-based end closures |
| CN116196641B (en) * | 2022-09-08 | 2024-05-03 | 广州泽力医药科技有限公司 | Preparation technology of composite vegetable soup base package |
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| CN108860888A (en) * | 2018-08-29 | 2018-11-23 | 刘文钦 | One kind can strengthen the design of dixie cup crimped lid conjunction |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP2571772A1 (en) | 2013-03-27 |
| WO2011146087A1 (en) | 2011-11-24 |
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