CN104249525A - PET (Polyethylene Terephthalate) composite packaging material and preparing method thereof - Google Patents
PET (Polyethylene Terephthalate) composite packaging material and preparing method thereof Download PDFInfo
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- CN104249525A CN104249525A CN201410476357.7A CN201410476357A CN104249525A CN 104249525 A CN104249525 A CN 104249525A CN 201410476357 A CN201410476357 A CN 201410476357A CN 104249525 A CN104249525 A CN 104249525A
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Abstract
The invention discloses a PET (Polyethylene Terephthalate) composite packaging material specially used for food packaging. The PET composite packaging material comprises a PET sheet material and a composite film compounded on the surface of the PET sheet material, wherein the composite film comprises a bonding layer, and the PET sheet material is bonded with the bonding layer; the bonding layer is made from an ethylene copolymer, and the comonomer of the ethylene copolymer is ethyl acetate, acrylate or maleic anhydride. Correspondingly, the invention further discloses a method for preparing the PET composite packaging material. The bonding layer is directly bonded with the PET sheet material, so that the glue laminating procedure is reduced, no solvents are left, the cost is lowered, resource wastes are reduced, and environmental pollution caused by glue laminating is further avoided.
Description
Technical field
The present invention relates to field of packaging material, particularly a kind of PET compound package material and preparation method thereof.
Background technology
Traditional handicraft is that itself and composite membrane are combined with each other by dry-lamination process by PET sheet.So-called dry-lamination process is applied to adhesive on thin film exactly, through oven drying, then fits into the technique of laminated film with another layer film hot pressing, specifically comprises:
1) allotment of adhesive
In order to make joint product obtain best combination property and adhesive property, for the adhesive of two component, the product description that the proportioning of host and curing agent must provide according to manufacturer carries out.During deployment operations, first take host, curing agent and ethyl ester on request appropriate, then host is poured in container, it is suitable to be diluted to ethyl ester, according to previous experiences, estimate the solids content of the adhesive of done product, the general adhesive solids content used is 25% ~ 40%.When adding ethyl ester, stir until evenly, finally add curing agent, then stir with wooden stick, can use along same direction with wooden stick.
The glue-spread of adhesive is at 3.5 ~ 4.5g/m
2.
2) dry type compound concrete operations
1. first on Scroll, install paper web, then install the first base material film volume, the trend of specifying by equipment wears film, and installs the second base material film volume, then lifts one group of roller of upper glue roller, base material is not contacted with upper glue roller.
2. in adhesive dish, add adhesive, open drying tunnel heater, start auxiliary driving motor, the pressure between adjustment upper glue roller and anilox roll, make rubber roll is coated with the thin and uniform adhesive of one deck.After drying tunnel temperature reaches requirement, open cooling water, enable air blast and exhaust blower, close auxiliary-motor, put down the roller above upper glue roller, the first base material is pressed to rubber roll, drives main frame, the second base material is bonded on the first base material and carries out compound.
3. membrane tension and composite pressure is adjusted.
4. baking temperature and wind speed is adjusted., dry peel strength, the transparency be conducive to increasing initial bonding strength directly having influence on composite membrane.First, second and third section of temperature of drying tunnel is generally 50 ~ 60 DEG C, 60 ~ 70 DEG C, 70 ~ 80 DEG C, and temperature must raise by step.
3) slaking
Solidification is also named in slaking, exactly the film be compounded with is put into curing chamber, makes host and the curing agent generation cross-linking reaction of polyurethane binder, and with by the process of composite base material surface interaction.The main purpose of slaking is that host and curing agent are fully reacted within a certain period of time, reaches best complex intensity; Next removes lower boiling residual solvent.
4) cut
PET composite sheet good for slaking is cut, is cut into required width.
That is, traditional PET sheet and the combination process of composite membrane need first to prepare PET separately, prepare composite membrane separately, and then PET and composite membrane are fitted on compounding machine.And recombination process needs gluing-curing oven-pressing three step.
Adopt above-mentioned combination process, there is following shortcoming: 1, operation is various, cost is high, need glue compound; 2, prepare separately PET, composite membrane all to need to cut, two steps all need stay limit and cut away, and waste material is many; 3, glue is needed, not environmentally and have residual solvent risk of exceeding criterion.
Summary of the invention
Technical problem to be solved by this invention is, provides the PET compound package material of a kind of environmental protection, noresidue, low cost, under the prerequisite simplifying compound working procedure and equipment, ensures that quality of the present invention is suitable with conventional P ET composite sheet.
Technical problem to be solved by this invention is also, provides a kind of method preparing above-mentioned PET compound package material.
For reaching above-mentioned technique effect, the invention provides a kind of PET compound package material, being exclusively used in packaging for foodstuff, comprising:
Be compounded in the laminated film on described PET sheet surface;
Described laminated film comprises adhesive layer, described PET sheet and described adhesive layer bonding;
Described adhesive layer is made up of ethylene copolymer, and the comonomer of described ethylene copolymer is ethyl acetate, acrylate or maleic anhydride.
As the improvement of such scheme, described ethylene copolymer is ethylene-ethyl acetate copolymer, and the content of the ethyl acetate of described ethylene-ethyl acetate copolymer is 10-18%, and melt index is 1-20g/10min.
As the improvement of such scheme, described laminated film also comprises:
Be located at the functional layer on described adhesive layer surface;
Be located at the hot sealing layer on described functional layer surface;
Described PET sheet, adhesive layer, functional layer are connected successively with hot sealing layer.
As the improvement of such scheme, the thickness of described PET sheet is 150-1000 μm;
Thickness >=5 μm of described adhesive layer;
The thickness of described functional layer is 3-80 μm;
The thickness of described hot sealing layer is 5-30 μm;
The gross thickness of described laminated film is 30-200 μm.
As the improvement of such scheme, described functional layer comprises PE layer, barrier layer, nylon layer and/or easily tears layer, and described barrier layer is EVOH barrier layer or PVDC barrier layer;
Described hot sealing layer is PE layer or easily tears layer.
As the improvement of such scheme, the described layer that easily tears is made up of polybutene and polyethylene blend, and the ratio of described polybutene and poly consumption is 10-30:70-90.
As the improvement of such scheme, described polyethylene comprises LLDPE and low density polyethylene (LDPE), and the ratio of the consumption of described polybutene, LLDPE and low density polyethylene (LDPE) is 10-30:20-40:40-60;
Wherein, the melt index of described LLDPE is 1.0-2.5g/10min, and fusing point is 110-130 DEG C;
The melt index of described low density polyethylene (LDPE) is 1.5-3.0g/10min, and fusing point is 100-120 DEG C.
Accordingly, the present invention also provides a kind of method preparing above-mentioned PET compound package material, comprising:
The laminated film with adhesive layer is formed by extruder;
PET pellet adds hot extrusion through extruder, makes pellet plastify into molten state, by adhesive layer pressing between top roll and central roll of the PET of molten state and described laminated film, and through lower roll sizing, cuts, rolling, obtains finished product;
Wherein, described adhesive layer is made up of ethylene copolymer, and the comonomer of described ethylene copolymer is ethyl acetate, acrylate or maleic anhydride.
As the improvement of such scheme, described preparation method comprises:
The adhesive layer of molten state is formed by extruder A;
The functional layer of molten state is formed by extruder B;
The hot sealing layer of molten state is formed by extruder C;
The adhesive layer of molten state, functional layer and hot sealing layer converge in composite machine head, are overlapped into Multi-layer material and flow through machine head port mould and extrude, shape, obtain laminated film;
PET pellet adds hot extrusion through extruder, makes pellet plastify into molten state, by adhesive layer pressing between top roll and central roll of the PET of molten state and described laminated film, and through lower roll sizing, cuts, rolling, obtains finished product;
Described adhesive layer is made up of ethylene copolymer, and the comonomer of described ethylene copolymer is ethyl acetate, acrylate or maleic anhydride.
As the improvement of such scheme, described ethylene copolymer is ethylene-ethyl acetate copolymer, and the content of the ethyl acetate of described ethylene-ethyl acetate copolymer is 10-18%, and melt index is 1-20g/10min;
The temperature of described top roll is 15-25 DEG C, and the temperature of described central roll is 15-25 DEG C, and the temperature of described lower roll is 35-45 DEG C.
As the improvement of such scheme, the thickness of described PET sheet is 150-1000 μm;
Thickness >=5 μm of described adhesive layer;
The thickness of described functional layer is 3-80 μm;
The thickness of described hot sealing layer is 5-30 μm;
The gross thickness of described laminated film is 30-200 μm.
As the improvement of such scheme, described functional layer comprises PE layer, barrier layer, nylon layer and/or easily tears layer, and described barrier layer is EVOH barrier layer or PVDC barrier layer;
Described hot sealing layer is PE layer or easily tears layer.
As the improvement of such scheme, the described layer that easily tears is made up of polybutene and polyethylene blend, and the ratio of described polybutene and poly consumption is 10-30:70-90.
As the improvement of such scheme, described polyethylene comprises LLDPE and low density polyethylene (LDPE), and the ratio of the consumption of described polybutene, LLDPE and low density polyethylene (LDPE) is 10-30:20-40:40-60;
Wherein, the melt index of described LLDPE is 1.0-2.5g/10min, and fusing point is 110-130 DEG C;
The melt index of described low density polyethylene (LDPE) is 1.5-3.0g/10min, and fusing point is 100-120 DEG C.
Implement the present invention and there is following beneficial effect:
One, the invention provides a kind of PET compound package material, comprise PET sheet and be compounded in the laminated film on its surface, laminated film comprises adhesive layer, and adhesive layer is made up of ethylene copolymer, PET sheet and adhesive layer bonding.
(1) packaging material of the present invention do not adopt glue as adhesive, but the adhesive layer using employing ethylene copolymer to make and PET sheet directly bond, without glue, no solvent residue, reduce costs, reduce the wasting of resources, but also avoid the environmental pollution that glue compound is brought.
(2) adhesive layer of the present invention is ethylene copolymer, and its comonomer is ethyl acetate, acrylate or maleic anhydride, can ensure still can reach higher intensity under the condition of not gluing.
(3) laminated film preferably includes adhesive layer, functional layer and hot sealing layer, adhesive layer, functional layer and hot sealing layer are compounded in PET sheet surface successively, adhesive layer ensures its intensity, functional layer ensures the diversity of its function, hot sealing layer ensures its line easy-tear performance, three's acting in conjunction, makes PET compound package material of the present invention meet multiple demand.
(4) easily tear layer to be made up of polybutene and polyethylene blend, the ratio of described polybutene and poly consumption is 10-30:70-90, closed environment is formed to seal with other polyvinyls, have wider heat-sealing temperature scope (40-50 DEG C), easily tear function-stable and be easy to adjust the size of easy tearing force; Peel off clean interfaces, can not pollute.
(5) environment protection health of the present invention, meets the safety and health request of packaging material for food, can be widely used in food container.
Two, the invention provides a kind of method preparing above-mentioned PET compound package material, its adhesive layer made by ethylene copolymer, make laminated film and the direct pressing of PET sheet and cut and can obtain finished product.
(1) conventional P ET needs employing three to overlap manufacturing equipment to obtain through three road compound working procedures, specifically need first to prepare PET separately, prepare composite membrane separately, and then on compounding machine, utilize glue to fit PET and composite membrane.And composite membrane is directly imported the production line of PET by the present invention, at PET direct and composite membrane pressing and forming while top roll, central roll and lower roll, without the need to gluing, without the need to compounding machine.
Three traditional road compound working procedures are integrated into a procedure and complete by the present invention, and only need the production equipment of a set of PET to realize, Simplified flowsheet, simplified apparatus, reduces costs, and avoids the waste material of repeatedly cutting generation.And adopt the once-combined operation of the present invention, can produce the product of performance identical with conventional P ET composite sheet, the combined strength bination of material can reach 10N/25mm, and described product also has environmental protection, without the advantage such as glue, no solvent residue.
(2) preparation method of the present invention produces the production requirement that the PET compound package material product obtained meets continuous packing machine completely, effectively enhances productivity.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of PET compound package material first embodiment of the present invention;
Fig. 2 is the schematic diagram of PET compound package material second embodiment of the present invention;
Fig. 3 is the schematic diagram of PET compound package material the 3rd embodiment of the present invention;
Fig. 4 is the schematic diagram of PET compound package material the 4th embodiment of the present invention;
Fig. 5 is the schematic diagram of PET compound package material the 5th embodiment of the present invention;
Fig. 6 is the schematic diagram of PET compound package material the 6th embodiment of the present invention;
Fig. 7 is the process chart of PET compound package material preparation method of the present invention.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail.
Composition graphs 1 to Fig. 6, the invention provides a kind of numerous embodiments of PET compound package material, described PET compound package material at least comprises: PET sheet 1, be compounded in the laminated film 2 on described PET sheet 1 surface, wherein, described laminated film 2 comprises adhesive layer 21, and described PET sheet 1 is bonding with described adhesive layer 21.Wherein, described adhesive layer 21 is made up of ethylene copolymer, and the comonomer of described ethylene copolymer is ethyl acetate, acrylate or maleic anhydride.
Packaging material of the present invention do not adopt glue as adhesive, but use the adhesive layer 21 adopting ethylene copolymer to make directly to bond with PET sheet 1, reduce glue compound working procedure, no solvent residue, reduce costs, reduce the wasting of resources, but also avoid the environmental pollution that glue compound is brought.
Concrete, the thickness of described PET sheet 1 is 150-1000 μm, but is not limited thereto.Preferably, the thickness of described PET sheet 1 is 200-1000 μm.
PET (polyethylene terephthalate, PETG), by ethylene glycol terephthalate generation dehydration condensation.PET has excellent physical and mechanical properties in wider temperature range.PET sheet is by through modification by copolymerization, and the PET copolymer extrusion molding making it to generate asymmetric molecult structure obtains.The copolymerization PET melt extruded from head is in blocks through quenching sizing, and produce unformed/non-crystalline state, thus PET sheet has the very high transparency.
The gross thickness of described laminated film 2 is 30-200 μm.Preferably, the gross thickness of described laminated film 2 is 40-60 μm.Better, the gross thickness of described laminated film 2 is 50 μm.
Described adhesive layer is made up of ethylene copolymer, and the comonomer of described ethylene copolymer is ethyl acetate, acrylate or maleic anhydride.That is, described ethylene copolymer is ethylene-ethyl acetate copolymer (EVA), or vinyl-acrylate copolymer, or ethylene maleic acid anhydride copolymer.
Preferably, described adhesive layer 21 is made up of ethylene-ethyl acetate copolymer, the ethyl acetate content of described ethylene-ethyl acetate copolymer is 10-18%, fusing point >=80 DEG C, melt index is 1-20g/10min, make adhesive layer can realize firmly boning with PET sheet, ensure the combined strength bination of PET packaging material.
If the ethyl acetate content < 10% of ethylene-ethyl acetate copolymer, can cause combined strength bination low, can not meet the requirement of packaging applications;
If the ethyl acetate content > 18% of ethylene-ethyl acetate copolymer, can cause the processing difficulties of film own, and the difficulty of operation laminating after increasing; Simultaneously because fusing point is on the low side, there is the risk that packaging lost efficacy.
Preferably, the ethyl acetate content of described ethylene-ethyl acetate copolymer is 12-18%, better, and the ethyl acetate content of described ethylene-ethyl acetate copolymer is 16%.
According to the difference of laminated film forming method, select the ethylene-ethyl acetate copolymer of suitable melt index.When selecting coextrusion periosteum method, the melt index of described ethylene-ethyl acetate copolymer is 1.0-4.0g/10min; When selecting the flat embrane method of coextrusion, the melt index of described ethylene-ethyl acetate copolymer is 5-15g/10min (flat embrane method).
Thickness >=5 μm of described adhesive layer 21, but be not limited thereto.Preferably, the thickness of described adhesive layer 21 is 5-30 μm.
Described laminated film 2, except adhesive layer 21, can also arrange other layers, such as, and functional layer and hot sealing layer.
As a preferred embodiment of described laminated film 2, it comprises:
Adhesive layer 21;
Be located at the functional layer 22 on described adhesive layer 21 surface;
Be located at the hot sealing layer 23 on described functional layer 22 surface;
Described PET sheet 1, adhesive layer 21, functional layer 22 are connected successively with hot sealing layer 23.
Wherein, described hot sealing layer 23 is for easily to tear layer or PE layer.The thickness of described hot sealing layer 23 is 5-30 μm, but is not limited thereto.Preferably, the thickness of described hot sealing layer 23 is 10-15 μm.
According to needing, can arrange functional layer 22 between adhesive layer 21 and hot sealing layer 23, the thickness of described functional layer 22 is preferably 3-80 μm.Better, the thickness of described functional layer 22 is preferably 5-70 μm.
Described functional layer 22 can for PE layer, easily tear layer, or barrier layer, also can be the nylon layer increasing film anti-puncture performance, can also be PE layer, barrier layer, nylon layer, easily tear any combination between layer, and not as limit.Wherein, described barrier layer is EVOH barrier layer or PVDC barrier layer, and barrier layer, nylon layer can be connected by adhesive layer with between adhesive layer, hot sealing layer, and described adhesive layer is preferably PE adhesive layer.
It should be noted that, PE (polyethylene, polyethylene), is that ethene is through being polymerized obtained a kind of thermoplastic resin.EVOH (Ethylene vinyl alcohol copolymer, ethylene/vinyl alcohol copolymer) is a kind of high barrier material of excellent performance.PVDC (polyvinylidene chloride), its barrier is high, toughness strong and low-temperature heat-sealing, heat-shrinkable and chemical stability are good.
Further, the described layer that easily tears is made up of polybutene and polyethylene blend, and the ratio of described polybutene and poly consumption is 10-30:70-90, closed environment is formed to seal with other polyvinyls, improve line easy-tear performance, ensure that consumer can easily open, easy to use.
Described polyethylene comprises LLDPE and low density polyethylene (LDPE), and the ratio of the consumption of described polybutene, LLDPE and low density polyethylene (LDPE) is 10-30:20-40:40-60; Wherein, the melt index of described LLDPE is 1.0-2.5g/10min, and fusing point is 110-130 DEG C; The melt index of described low density polyethylene (LDPE) is 1.5-3.0g/10min, and fusing point is 100-120 DEG C.What adopt above-mentioned polybutene and polyethylene blend composition easily tears layer, has wider heat-sealing temperature scope (40-50 DEG C), easily tears function-stable and be easy to adjust the size of easy tearing force; Peel off clean interfaces, can not pollute.
Accordingly, the present invention also provides a kind of method preparing above-mentioned PET compound package material, comprising: formed the laminated film with adhesive layer by extruder; PET pellet adds hot extrusion through extruder, makes pellet plastify into molten state, by adhesive layer pressing between top roll and central roll of the PET of molten state and described laminated film, and through lower roll sizing, cuts, rolling, obtains finished product.
Wherein, the thickness of described PET sheet is 150-1000 μm, but is not limited thereto.Preferably, the thickness of described PET sheet is 200-1000 μm.
PET (polyethylene terephthalate, PETG), by ethylene glycol terephthalate generation dehydration condensation.PET has excellent physical and mechanical properties in wider temperature range.PET sheet is by through modification by copolymerization, and the PET copolymer extrusion molding making it to generate asymmetric molecult structure obtains.The copolymerization PET melt extruded from head is in blocks through quenching sizing, and produce unformed/non-crystalline state, thus PET sheet has the very high transparency.
Described adhesive layer is made up of ethylene copolymer, and the comonomer of described ethylene copolymer is ethyl acetate, acrylate or maleic anhydride.That is, described ethylene copolymer is ethylene-ethyl acetate copolymer (EVA), or vinyl-acrylate copolymer, or ethylene maleic acid anhydride copolymer.
Preferably, described adhesive layer is made up of ethylene-ethyl acetate copolymer, the ethyl acetate content of described ethylene-ethyl acetate copolymer is 10-18%, fusing point >=80 DEG C, melt index is 1-20g/10min, make adhesive layer can realize firmly boning with PET sheet, ensure the combined strength bination of PET packaging material.
If the ethyl acetate content < 10% of ethylene-ethyl acetate copolymer, can cause combined strength bination low, can not meet the requirement of packaging applications;
If the ethyl acetate content > 18% of ethylene-ethyl acetate copolymer, can cause the processing difficulties of film own, and the difficulty of operation laminating after increasing; Simultaneously because fusing point is on the low side, there is the risk that packaging lost efficacy.
Preferably, the ethyl acetate content of described ethylene-ethyl acetate copolymer is 12-18%, better, and the ethyl acetate content of described ethylene-ethyl acetate copolymer is 16%.
According to the difference of laminated film forming method, select the ethylene-ethyl acetate copolymer of suitable melt index.When selecting coextrusion periosteum method, the melt index of described ethylene-ethyl acetate copolymer is 1.0-4.0g/10min; When selecting the flat embrane method of coextrusion, the melt index of described ethylene-ethyl acetate copolymer is 5-15g/10min (flat embrane method).
Thickness >=5 μm of described adhesive layer, but be not limited thereto.Preferably, the thickness of described adhesive layer is 5-30 μm.
Further, laminated film preferably includes: adhesive layer, the functional layer being located at described adhesive layer surface and the hot sealing layer be located on described functional layer surface; Described PET sheet, adhesive layer, functional layer are connected successively with hot sealing layer.
For preparation is provided with the PET compound package material of the laminated film of above-mentioned preferred embodiment, adopt following preparation method, comprising:
(1) adhesive layer of molten state is formed by extruder A;
The ins and outs of described adhesive layer are consistent with above-mentioned, do not repeat them here.
(2) functional layer of molten state is formed by extruder B;
The thickness of described functional layer is preferably 3-80 μm.Better, the thickness of described functional layer is preferably 5-70 μm.
Described functional layer can for PE layer, easily tear layer, or barrier layer, also can be the nylon layer increasing film anti-puncture performance, can also be PE layer, barrier layer, nylon layer, easily tear any combination between layer, and not as limit.Wherein, described barrier layer is EVOH barrier layer or PVDC barrier layer, and barrier layer, nylon layer can be connected by adhesive layer with between adhesive layer, hot sealing layer, and described adhesive layer is preferably PE adhesive layer.
It should be noted that, PE (polyethylene, polyethylene), is that ethene is through being polymerized obtained a kind of thermoplastic resin.EVOH (Ethylene vinyl alcohol copolymer, ethylene/vinyl alcohol copolymer) is a kind of high barrier material of excellent performance.PVDC (polyvinylidene chloride), its barrier is high, toughness strong and low-temperature heat-sealing, heat-shrinkable and chemical stability are good.
Further, the described layer that easily tears is made up of polybutene and polyethylene blend, and the ratio of described polybutene and poly consumption is 10-30:70-90, closed environment is formed to seal with other polyvinyls, improve line easy-tear performance, ensure that consumer can easily open, easy to use.
Described polyethylene comprises LLDPE and low density polyethylene (LDPE), and the ratio of the consumption of described polybutene, LLDPE and low density polyethylene (LDPE) is 10-30:20-40:40-60; Wherein, the melt index of described LLDPE is 1.0-2.5g/10min, and fusing point is 110-130 DEG C; The melt index of described low density polyethylene (LDPE) is 1.5-3.0g/10min, and fusing point is 100-120 DEG C.What adopt above-mentioned polybutene and polyethylene blend composition easily tears layer, has wider heat-sealing temperature scope (40-50 DEG C), easily tears function-stable and be easy to adjust the size of easy tearing force; Peel off clean interfaces, can not pollute.
(3) hot sealing layer of molten state is formed by extruder C;
Described hot sealing layer is for easily to tear layer or PE layer.The thickness of described hot sealing layer is 5-30 μm, but is not limited thereto.Preferably, the thickness of described hot sealing layer is 10-15 μm.
The described layer that easily tears is made up of polybutene and polyethylene blend, the ratio of described polybutene and poly consumption is 10-30:70-90, forms closed environment to seal with other polyvinyls, improves line easy-tear performance, ensure that consumer can easily open, easy to use.
Described polyethylene comprises LLDPE and low density polyethylene (LDPE), and the ratio of the consumption of described polybutene, LLDPE and low density polyethylene (LDPE) is 10-30:20-40:40-60; Wherein, the melt index of described LLDPE is 1.0-2.5g/10min, and fusing point is 110-130 DEG C; The melt index of described low density polyethylene (LDPE) is 1.5-3.0g/10min, and fusing point is 100-120 DEG C.What adopt above-mentioned polybutene and polyethylene blend composition easily tears layer, has wider heat-sealing temperature scope (40-50 DEG C), easily tears function-stable and be easy to adjust the size of easy tearing force; Peel off clean interfaces, can not pollute.
(4) adhesive layer of molten state, functional layer and hot sealing layer converge in composite machine head, are overlapped into Multi-layer material and flow through machine head port mould and extrude, shape, obtain laminated film.
Concrete, prepare laminated film and can adopt coextrusion periosteum method or the flat embrane method of coextrusion.
Coextrusion periosteum method: adhesive layer, functional layer and hot sealing layer are respectively in respective extruder after fusion plastification, be transported in the respective runner of head, converge in common runner, be overlapped into Multi-layer material to flow through machine head port mould and extrude, after mould, pass through inflation, traction, cooling and shaping, batches, and once makes laminated film.
The flat embrane method of coextrusion: adhesive layer, functional layer and hot sealing layer are respectively in respective extruder after fusion plastification, be transported in the respective runner of a common T-shaped head, converge in common runner, be overlapped into Multi-layer material to flow through machine head port mould and extrude, after mould, directly stream drenches on chrome faced metal cooling roller, shape through over-quenching, trimming, batches, and once makes laminated film.
(5) PET pellet adds hot extrusion through extruder, makes pellet plastify into molten state, by adhesive layer pressing between top roll and central roll of the PET of molten state and described laminated film, and through lower roll sizing, cuts, rolling, obtains finished product.
Concrete, pressing step comprises: laminated film enters between top roll, central roll by deflector roll exchange premium, bonds, then derive finished product by lower roll with the PET of hot melt.
The temperature of described top roll is 15-25 DEG C, and the temperature of described central roll is 15-25 DEG C, and the temperature of described lower roll is 35-45 DEG C.Preferably, the temperature of described top roll is 20 DEG C, and the temperature of described central roll is 20 DEG C, and the temperature of described lower roll is 40 DEG C.Adopt the top roll of said temperature setting, central roll and lower roll, can ensure that PET is easily shaping, keep good transparency and physical property.
Below with composition graphs 1 to Fig. 7, set forth the present invention further with specific embodiment
Embodiment 1
See Fig. 1, the invention provides the first embodiment of PET compound package material, comprise PET sheet 1 and the laminated film 2 being compounded in described PET sheet 1 surface from top to bottom successively, the thickness of PET sheet 1 is 400 μm, the thickness of laminated film 2 is 50 μm, wherein, laminated film 2 comprises adhesive layer 21, functional layer 22, hot sealing layer 23, adhesive layer 21 is made up of ethylene-ethyl acetate copolymer (EVA), thickness is 10 μm, functional layer 22 is PE layer, and thickness is 25 μm, and the thickness of hot sealing layer 23 is 15 μm.
Its preparation process is as follows:
1, the laminated film be made up of adhesive layer, functional layer and hot sealing layer is prepared
Form the adhesive layer of molten state, PE layer and hot sealing layer respectively by extruder A, B, C, the adhesive layer of molten state, PE layer and hot sealing layer converge in composite machine head, are overlapped into Multi-layer material and flow through machine head port mould and extrude, shape, obtain laminated film.
Gross thickness (um) 50
It should be noted that, PB-1 is polybutene, and LLDPE is LLDPE, and LDPE is low density polyethylene (LDPE).
2, as shown in Figure 7, PET pellet adds hot extrusion through extruder, pellet is made to plastify into molten state, by the adhesive layer of laminated film 101 towards PET 102, and laminated film 101 is entered between top roll 103, central roll 104 by deflector roll exchange premium, the PET of molten state and adhesive layer pressing between top roll 103 and central roll 104 of described laminated film, and shape through lower roll 105, and once cut by cutting knife 106, rolling, obtain finished product.Wherein, the temperature of top roll is 15 DEG C, and the temperature of central roll is 15 DEG C, and the temperature of lower roll is 35 DEG C.
Embodiment 2
See Fig. 2, the invention provides the second embodiment of PET compound package material, comprise PET sheet 1 and the laminated film 2 being compounded in described PET sheet 1 surface from top to bottom successively, the thickness of PET sheet 1 is 300 μm, the thickness of laminated film 2 is 50 μm, wherein, laminated film 2 comprises adhesive layer 21, functional layer 22 and hot sealing layer 23, adhesive layer 21 is made up of ethylene-ethyl acetate copolymer (EVA), thickness is 5 μm, functional layer 22 comprises adhesive layer 22A, barrier layer 22B and adhesive layer 22C, and thickness is 25 μm, and the thickness of hot sealing layer 23 is 20 μm.
Its preparation process is as follows:
1, the laminated film be made up of adhesive layer, functional layer and hot sealing layer is prepared
The adhesive layer 21 of molten state, adhesive layer 22A, barrier layer 22B, adhesive layer 22C and hot sealing layer 23 is formed respectively by extruder A, B, C, D, E, the adhesive layer 21 of molten state, adhesive layer 22A, barrier layer 22B, adhesive layer 22C and hot sealing layer 23 converge in composite machine head, be overlapped into Multi-layer material to flow through machine head port mould and extrude, shape, obtain laminated film.
Gross thickness (um) 50
2, as shown in Figure 7, PET pellet adds hot extrusion through extruder, pellet is made to plastify into molten state, by the adhesive layer of laminated film 101 towards PET 102, and laminated film 101 is entered between top roll 103, central roll 104 by deflector roll exchange premium, the PET of molten state and adhesive layer pressing between top roll 103 and central roll 104 of described laminated film, and shape through lower roll 105, and once cut by cutting knife 106, rolling, obtain finished product.Wherein, the temperature of top roll is 20 DEG C, and the temperature of central roll is 20 DEG C, and the temperature of lower roll is 40 DEG C.
Embodiment 3
See Fig. 3, the invention provides the 3rd embodiment of PET compound package material, comprise PET sheet 1 and the laminated film 2 being compounded in described PET sheet 1 surface from top to bottom successively, the thickness of PET sheet 1 is 500 μm, the thickness of laminated film 2 is 55 μm, wherein, laminated film 2 comprises adhesive layer 21, functional layer 22 and hot sealing layer 23, adhesive layer 21 is made up of ethylene-ethyl acetate copolymer (EVA), thickness is 15 μm, functional layer 22 comprises adhesive layer 22A, nylon layer 22B and adhesive layer 22C, and thickness is 25 μm, and the thickness of hot sealing layer 23 is 15 μm.
Its preparation process is as follows:
1, the laminated film be made up of adhesive layer, functional layer and hot sealing layer is prepared
The adhesive layer 21 of molten state, adhesive layer 22A, nylon layer 22B, adhesive layer 22C and hot sealing layer 23 is formed respectively by extruder A, B, C, D, E, the adhesive layer 21 of molten state, adhesive layer 22A, nylon layer 22B, adhesive layer 22C and hot sealing layer 23 converge in composite machine head, be overlapped into Multi-layer material to flow through machine head port mould and extrude, shape, obtain laminated film.
Gross thickness (um) 55
2, as shown in Figure 7, PET pellet adds hot extrusion through extruder, pellet is made to plastify into molten state, by the adhesive layer of laminated film 101 towards PET 102, and laminated film 101 is entered between top roll 103, central roll 104 by deflector roll exchange premium, the PET of molten state and adhesive layer pressing between top roll 103 and central roll 104 of described laminated film, and shape through lower roll 105, and once cut by cutting knife 106, rolling, obtain finished product.Wherein, the temperature of top roll is 18 DEG C, and the temperature of central roll is 18 DEG C, and the temperature of lower roll is 38 DEG C.
Embodiment 4
See Fig. 4, the invention provides the 4th embodiment of PET compound package material, comprise PET sheet 1 and the laminated film 2 being compounded in described PET sheet 1 surface from top to bottom successively, the thickness of PET sheet 1 is 600 μm, the thickness of laminated film 2 is 60 μm, wherein, laminated film 2 comprises adhesive layer 21, functional layer 22 and hot sealing layer 23, adhesive layer 21 is made up of ethylene-ethyl acetate copolymer (EVA), thickness is 20 μm, functional layer 22 comprises adhesive layer 22A, nylon layer 22B, barrier layer 22C, nylon layer 22D and adhesive layer 22E, thickness is 25 μm, the thickness of hot sealing layer 23 is 15 μm.
Its preparation process is as follows:
1, the laminated film be made up of adhesive layer, functional layer and hot sealing layer is prepared
The adhesive layer 21 of molten state, adhesive layer 22A, nylon layer 22B, barrier layer 22C, nylon layer 22D, adhesive layer 22E and hot sealing layer 23 is formed respectively by extruder A, B, C, D, E, F, G, the adhesive layer 21 of molten state, adhesive layer 22A, nylon layer 22B, barrier layer 22C, nylon layer 22D, adhesive layer 22E and hot sealing layer 23 converge in composite machine head, be overlapped into Multi-layer material to flow through machine head port mould and extrude, shape, obtain laminated film.
Gross thickness (um) 60
2, as shown in Figure 7, PET pellet adds hot extrusion through extruder, pellet is made to plastify into molten state, by the adhesive layer of laminated film 101 towards PET 102, and laminated film 101 is entered between top roll 103, central roll 104 by deflector roll exchange premium, the PET of molten state and adhesive layer pressing between top roll 103 and central roll 104 of described laminated film, and shape through lower roll 105, and once cut by cutting knife 106, rolling, obtain finished product.Wherein, the temperature of top roll is 22 DEG C, and the temperature of central roll is 22 DEG C, and the temperature of lower roll is 42 DEG C.
Embodiment 5
See Fig. 5, the invention provides the 5th embodiment of PET compound package material, comprise PET sheet 1 and the laminated film 2 being compounded in described PET sheet 1 surface from top to bottom successively, the thickness of PET sheet 1 is 150 μm, the thickness of laminated film 2 is 40 μm, wherein, laminated film 2 comprises adhesive layer 21, functional layer 22 and hot sealing layer 23, adhesive layer 21 is made up of ethylene-ethyl acetate copolymer (EVA), thickness is 10 μm, functional layer 22 comprises PE layer 22A, adhesive layer 22B, barrier layer 22C, adhesive layer 22D and PE layer 22E, thickness is 32 μm, the thickness of hot sealing layer 23 is 8 μm.
Its preparation process is as follows:
1, the laminated film be made up of adhesive layer, functional layer and hot sealing layer is prepared
The adhesive layer 21 of molten state, PE layer 22A, adhesive layer 22B, barrier layer 22C, adhesive layer 22D and PE layer 22E and hot sealing layer 23 is formed respectively by extruder A, B, C, D, E, F, G, the adhesive layer 21 of molten state, PE layer 22A, adhesive layer 22B, barrier layer 22C, adhesive layer 22D and PE layer 22E and hot sealing layer 23 converge in composite machine head, be overlapped into Multi-layer material to flow through machine head port mould and extrude, shape, obtain laminated film.
Gross thickness (um) 60
2, as shown in Figure 7, PET pellet adds hot extrusion through extruder, pellet is made to plastify into molten state, by the adhesive layer of laminated film 101 towards PET 102, and laminated film 101 is entered between top roll 103, central roll 104 by deflector roll exchange premium, the PET of molten state and adhesive layer pressing between top roll 103 and central roll 104 of described laminated film, and shape through lower roll 105, and once cut by cutting knife 106, rolling, obtain finished product.Wherein, the temperature of top roll is 25 DEG C, and the temperature of central roll is 25 DEG C, and the temperature of lower roll is 45 DEG C.
Embodiment 6
See Fig. 6, the invention provides the 6th embodiment of PET compound package material, comprise PET sheet 1 and the laminated film 2 being compounded in described PET sheet 1 surface from top to bottom successively, the thickness of PET sheet 1 is 800 μm, the thickness of laminated film 2 is 100 μm, wherein, laminated film 2 comprises adhesive layer 21, functional layer 22, hot sealing layer 23, and adhesive layer 21 is made up of vinyl-acrylate copolymer, thickness is 20 μm, functional layer 22 is PE layer, and thickness is 50 μm, and the thickness of hot sealing layer 23 is 30 μm.
Its preparation process is as follows:
1, the laminated film be made up of adhesive layer, functional layer and hot sealing layer is prepared
Form the adhesive layer of molten state, PE layer and hot sealing layer respectively by extruder A, B, C, the adhesive layer of molten state, PE layer and hot sealing layer converge in composite machine head, are overlapped into Multi-layer material and flow through machine head port mould and extrude, shape, obtain laminated film.
Gross thickness (um) 100
2, as shown in Figure 7, PET pellet adds hot extrusion through extruder, pellet is made to plastify into molten state, by the adhesive layer of laminated film 101 towards PET 102, and laminated film 101 is entered between top roll 103, central roll 104 by deflector roll exchange premium, the PET of molten state and adhesive layer pressing between top roll 103 and central roll 104 of described laminated film, and shape through lower roll 105, and once cut by cutting knife 106, rolling, obtain finished product.Wherein, the temperature of top roll is 15 DEG C, and the temperature of central roll is 15 DEG C, and the temperature of lower roll is 35 DEG C.
The PET compound package material finished product of embodiment 1-6 gained is carried out technology for detection, result
As following table once:
Meanwhile, detect the outward appearance of embodiment 1-6 and packed soak, result is as table two time:
| Embodiment | Outward appearance | Packed soak |
| Embodiment 1 | Smooth, without wrinkle, edge sealing is good, and flawless, hole is separated with composite bed | Free from extraneous odour, foreign odor, muddiness and decolouring |
| Embodiment 2 | Smooth, without wrinkle, edge sealing is good, and flawless, hole is separated with composite bed | Free from extraneous odour, foreign odor, muddiness and decolouring |
| Embodiment 3 | Smooth, without wrinkle, edge sealing is good, and flawless, hole is separated with composite bed | Free from extraneous odour, foreign odor, muddiness and decolouring |
| Embodiment 4 | Smooth, without wrinkle, edge sealing is good, and flawless, hole is separated with composite bed | Free from extraneous odour, foreign odor, muddiness and decolouring |
| Embodiment 5 | Smooth, without wrinkle, edge sealing is good, and flawless, hole is separated with composite bed | Free from extraneous odour, foreign odor, muddiness and decolouring |
| Embodiment 6 | Smooth, without wrinkle, edge sealing is good, and flawless, hole is separated with composite bed | Free from extraneous odour, foreign odor, muddiness and decolouring |
From table one and two, the present invention does not adopt glue as adhesive, but the adhesive layer using employing ethylene copolymer to make and PET sheet directly bond, still the product of performance identical with conventional P ET composite sheet can be produced, the combined strength bination of material is more than 10N/25mm, heat seal strength is more than 8N/25mm, and environment protection health of the present invention, whole test item meets GB9683-1988 " Composite laminated food packaging bag sanitary standard ", meet the safety and health request of packaging material for food, can food container be widely used in.
It should be noted that, described combined strength bination, heat seal strength be temperature be 23 DEG C, humidity records under being the environmental condition of 58%.
To sum up, implement the present invention and there is following beneficial effect:
One, the invention provides a kind of PET compound package material, comprise PET sheet and be compounded in the laminated film on its surface, laminated film comprises adhesive layer, and adhesive layer is made up of ethylene copolymer, PET sheet and adhesive layer bonding.
(1) packaging material of the present invention do not adopt glue as adhesive, but the adhesive layer using employing ethylene copolymer to make and PET sheet directly bond, without glue, no solvent residue, reduce costs, reduce the wasting of resources, but also avoid the environmental pollution that glue compound is brought.
(2) adhesive layer of the present invention is ethylene copolymer, and its comonomer is ethyl acetate, acrylate or maleic anhydride, can ensure still can reach higher intensity under the condition of not gluing.
(3) laminated film preferably includes adhesive layer, functional layer and hot sealing layer, adhesive layer, functional layer and hot sealing layer are compounded in PET sheet surface successively, adhesive layer ensures its intensity, functional layer ensures the diversity of its function, hot sealing layer ensures its line easy-tear performance, three's acting in conjunction, makes PET compound package material of the present invention meet multiple demand.
(4) easily tear layer to be made up of polybutene and polyethylene blend, the ratio of described polybutene and poly consumption is 10-30:70-90, closed environment is formed to seal with other polyvinyls, have wider heat-sealing temperature scope (40-50 DEG C), easily tear function-stable and be easy to adjust the size of easy tearing force; Peel off clean interfaces, can not pollute.
(5) environment protection health of the present invention, meets the safety and health request of packaging material for food, can be widely used in food container.
Two, the invention provides a kind of method preparing above-mentioned PET compound package material, its adhesive layer made by ethylene copolymer, make laminated film and the direct pressing of PET sheet and cut and can obtain finished product.
(1) conventional P ET needs employing three to overlap manufacturing equipment to obtain through three road compound working procedures, specifically need first to prepare PET separately, prepare composite membrane separately, and then on compounding machine, utilize glue to fit PET and composite membrane.And composite membrane is directly imported the production line of PET by the present invention, at PET direct and composite membrane pressing and forming while top roll, central roll and lower roll, without the need to gluing, without the need to compounding machine.
Three traditional road compound working procedures are integrated into a procedure and complete by the present invention, and only need the production equipment of a set of PET to realize, Simplified flowsheet, simplified apparatus, reduces costs, and avoids the waste material of repeatedly cutting generation.And adopt the once-combined operation of the present invention, can produce the product of performance identical with conventional P ET composite sheet, the combined strength bination of material can reach 10N/25mm, and described product also has environmental protection, without the advantage such as glue, no solvent residue.
(2) preparation method of the present invention produces the production requirement that the PET compound package material product obtained meets continuous packing machine completely, effectively enhances productivity.
The above is the preferred embodiment of the present invention, should be understood that, although the present invention only gives above embodiment, but also provide many possible variants not needing to draw through creative work, though still cannot be exhaustive, but those skilled in the art are after reading over this description, in conjunction with common practise, more detailed description of the invention should be able to be associated, the spirit of the not unconventional the claims in the present invention of this type of detailed description of the invention, any type of equivalent replacement or some improvements and modifications all should be considered as the embodiment be included by the present invention, belong to protection scope of the present invention.
Claims (10)
1. a PET compound package material, is exclusively used in packaging for foodstuff, comprises PET sheet, it is characterized in that, also comprises:
Be compounded in the laminated film on described PET sheet surface;
Described laminated film comprises adhesive layer, described PET sheet and described adhesive layer bonding;
Described adhesive layer is made up of ethylene copolymer, and the comonomer of described ethylene copolymer is ethyl acetate, acrylate or maleic anhydride.
2. PET compound package material as claimed in claim 1, it is characterized in that, described ethylene copolymer is ethylene-ethyl acetate copolymer, and the content of the ethyl acetate of described ethylene-ethyl acetate copolymer is 10-18%, and melt index is 1-20g/10min.
3. PET compound package material as claimed in claim 2, it is characterized in that, described laminated film also comprises:
Be located at the functional layer on described adhesive layer surface;
Be located at the hot sealing layer on described functional layer surface;
Described PET sheet, adhesive layer, functional layer are connected successively with hot sealing layer.
4. PET compound package material as claimed in claim 3, it is characterized in that, the thickness of described PET sheet is 150-1000 μm;
Thickness >=5 μm of described adhesive layer;
The thickness of described functional layer is 3-80 μm;
The thickness of described hot sealing layer is 5-30 μm;
The gross thickness of described laminated film is 30-200 μm.
5. PET compound package material as claimed in claim 3, it is characterized in that, described functional layer comprises PE layer, barrier layer, nylon layer and/or easily tears layer, and described barrier layer is EVOH barrier layer or PVDC barrier layer;
Described hot sealing layer is PE layer or easily tears layer.
6. PET compound package material as claimed in claim 5, it is characterized in that, the described layer that easily tears is made up of polybutene and polyethylene blend, and the ratio of described polybutene and poly consumption is 10-30:70-90.
7. PET compound package material as claimed in claim 6, it is characterized in that, described polyethylene comprises LLDPE and low density polyethylene (LDPE), and the ratio of the consumption of described polybutene, LLDPE and low density polyethylene (LDPE) is 10-30:20-40:40-60;
Wherein, the melt index of described LLDPE is 1.0-2.5g/10min, and fusing point is 110-130 DEG C;
The melt index of described low density polyethylene (LDPE) is 1.5-3.0g/10min, and fusing point is 100-120 DEG C.
8. prepare a method for the PET compound package material as described in any one of claim 1-6, it is characterized in that, comprising:
The laminated film with adhesive layer is formed by extruder;
PET pellet adds hot extrusion through extruder, makes pellet plastify into molten state, by adhesive layer pressing between top roll and central roll of the PET of molten state and described laminated film, and through lower roll sizing, cuts, rolling, obtains finished product;
Wherein, described adhesive layer is made up of ethylene copolymer, and the comonomer of described ethylene copolymer is ethyl acetate, acrylate or maleic anhydride.
9. prepare the method for PET compound package material as claimed in claim 8, it is characterized in that, comprising:
The adhesive layer of molten state is formed by extruder A;
The functional layer of molten state is formed by extruder B;
The hot sealing layer of molten state is formed by extruder C;
The adhesive layer of molten state, functional layer and hot sealing layer converge in composite machine head, are overlapped into Multi-layer material and flow through machine head port mould and extrude, shape, obtain laminated film;
PET pellet adds hot extrusion through extruder, makes pellet plastify into molten state, by adhesive layer pressing between top roll and central roll of the PET of molten state and described laminated film, and through lower roll sizing, cuts, rolling, obtains finished product;
Wherein, described adhesive layer is made up of ethylene copolymer, and the comonomer of described ethylene copolymer is ethyl acetate, acrylate or maleic anhydride.
10. prepare the method for PET compound package material as claimed in claim 8 or 9, it is characterized in that, described ethylene copolymer is ethylene-ethyl acetate copolymer, and the content of the ethyl acetate of described ethylene-ethyl acetate copolymer is 10-18%, and melt index is 1-20g/10min; The temperature of described top roll is 15-25 DEG C, and the temperature of described central roll is 15-25 DEG C, and the temperature of described lower roll is 35-45 DEG C.
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| CN111016359A (en) * | 2019-11-12 | 2020-04-17 | 福建富一锦科技有限公司 | PE low-temperature packaging film and preparation method and application thereof |
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| CN111497408A (en) * | 2020-06-15 | 2020-08-07 | 昆山运城塑业有限公司 | Antibacterial degradable film with nano-silver as surface layer additive and preparation method thereof |
| CN114714728A (en) * | 2022-03-17 | 2022-07-08 | 乐美包装（昆山）有限公司 | Longitudinal seal and manufacturing method thereof |
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Application publication date: 20141231 |