CN107351502B - High-temperature-resistant and heat-insulating composite sheet and manufacturing method thereof - Google Patents
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- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
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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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
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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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
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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
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
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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
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
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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
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
- B32B37/1284—Application of adhesive
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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
- B32B38/00—Ancillary operations in connection with laminating processes
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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
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/16—Drying; Softening; Cleaning
- B32B38/164—Drying
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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
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/10—Interconnection of layers at least one layer having inter-reactive properties
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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
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/40—Applications of laminates for particular packaging purposes
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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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/304—Insulating
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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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/306—Resistant to heat
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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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/412—Transparent
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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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
- B32B2307/7242—Non-permeable
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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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/726—Permeability to liquids, absorption
- B32B2307/7265—Non-permeable
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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
- B32B2439/00—Containers; Receptacles
- B32B2439/70—Food packaging
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- Engineering & Computer Science (AREA)
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Abstract
The invention discloses a high-temperature-resistant and heat-insulating composite sheet material, which comprises a CPET layer, a glue layer and an EPP layer and/or an EPS layer which are sequentially arranged, wherein the CPET layer, the glue layer and the EPP layer and/or the EPS layer are compounded by a dry-compound process; or comprises a CPET layer, an SPE layer and an EPP layer and/or an EPS layer which are sequentially arranged and are compounded by an extrusion process; or comprises a CPET layer, an EOE layer, an SPE layer and an EPP layer and/or an EPS layer which are sequentially arranged, and is formed by compounding through an extrusion process. A method of making the composite sheet field is also disclosed, the sheet being formed by extrusion or dry lamination. Through the multilayer composite structure, the product is endowed with high temperature resistance and heat preservation performance, the competitiveness of the content is improved, and the energy consumption of subsequent heating is reduced. Different hierarchical structures can be adopted according to actual use requirements, so that the requirements of transparency or no solvent residue can be met; even the transparency of the composite sheet can be improved by selecting the specially modified EMA, and the transparency and the solvent residue free advantage can be achieved at the same level as the dry-process technology.
Description
Technical Field
The invention relates to a high-temperature-resistant and heat-insulating composite sheet and a manufacturing method thereof.
Background
Home meal replacement (Home Meal Replacement): a fresh, ready-to-eat or slightly processed ready-to-eat convenience dish (Meals that are freshly prepared away from-home and are ready-to-eat or almost ready-to-eat) that is not self-cooked at home. At present, the package for household meal replacement is made of APET (namely non-crystallized polyethylene terephthalate), PVC (namely polyvinyl chloride), PP (namely polypropylene), PS (namely polystyrene), paper and other materials, and cannot meet the high-temperature preservation requirement of Chinese meal or fried food and the heat preservation requirement in the meal delivery process, so that a multifunctional composite sheet resistant to high temperature and heat preservation is developed to solve the problems. In the prior art, EVA (ethylene-vinyl acetate copolymer) materials are used in the hot-sticking process, so that the hot-sticking strength is low and the transparency is affected.
Patent application publication number CN 106003973A: a process for preparing the composite nano-particle modified polypropylene sheet includes such steps as smelting composition in simple extruder, extruding to obtain main body and modified material, and multi-layer composite preparing. It has good heat resistance but no heat preservation property. Patent publication number CN 101367285B: the polyester film at least comprises a first film layer and a second film layer, wherein the first film layer is positioned on the surface layer and is in coextrusion lamination with the second film layer, the first film layer is a heat sealing layer, and the heat sealing layer is composed of 50-90 wt% of amorphous polyester, 9.7-49 wt% of EVA resin and 0.3-1 wt% of anti-adhesion agent. EVA hot paste is adopted, the hot paste strength is low, and transparency is affected.
Disclosure of Invention
The invention mainly solves the technical problem of providing the high-temperature-resistant and heat-insulating composite sheet material which can meet the requirements of high temperature resistance and heat insulation of Chinese meal and fried product packaging.
The technical scheme adopted for solving the technical problems is as follows: the composite sheet with high temperature resistance and heat preservation comprises a CPET layer, a glue layer and an EPP layer and/or an EPS layer which are sequentially arranged, wherein the CPET layer, the glue layer and the EPP layer and/or the EPS layer are compounded through a dry-process technology. CPET is a crystallized polyethylene terephthalate that is nearly transparent under microwaves and can withstand oven temperatures of 240 ℃ for over 60 minutes without becoming brittle. Because of its high temperature resistance, CPET is well suited for packaging cooked meats and can be used directly for heating frozen foods in conventional ovens and microwave ovens. CPET is suitable for use between-40 ℃ and 240 ℃ due to the high precision control of material crystallization. Thus, the low-temperature impact strength and the high-temperature shape stability of the plastic are met. CPET has good air, water, carbon dioxide and nitrogen barrier properties. If the composite sheet is formed by compounding a CPET layer, a glue layer and an EPP layer and/or an EPS layer which are sequentially arranged through a dry-process technology, the transparency is good, but the solvent remains.
A composite sheet with high temperature resistance and heat preservation comprises an extruded CPET layer and an EPP layer and/or an EPS layer, wherein the extruded CPET layer and the EPP layer are/is extruded and coated with an SPE layer.
The utility model provides a composite sheet with high temperature resistant and heat preservation, includes CPET layer, EOE layer, SPE layer and EPP layer/or EPS layer that sets gradually, and CPET layer and the EOE layer of extruding heat paste bonding to extrude the SPE layer bonding between EOE layer and EPP layer/or EPS layer of extruding. EPP adopts Eperan-PP series of Kaneka company; EPS with Kaneka Co
HD series. The SPE is adopted, and the high temperature resistant layer (i.e. CPET layer) and the heat insulation layer (i.e. EPP layer or EPS layer) are bonded by special materials through an extrusion process, so that the method has the advantages of no solvent residue and influence on transparency, but the transparency of the composite sheet is improved by selecting specially modified EMA, and the same level as that of a dry process can be achieved. By multilayer composite structure, giveThe product has high temperature resistance and heat preservation performance, improves the competitiveness of the content, and reduces the energy consumption of subsequent heating. Wherein EPP is polypropylene plastic foaming material, EPS is polystyrene foam, EOE is a barrier material layer, SPE is modified ethylene-methyl acrylate copolymer, and SPE adopts DuPont's modified EMA with the brand number of 20D-855. And (3) bonding the CPET and the EOE by adopting a hot bonding process, namely unreeling the EOE in a film or hot state when the CPET is produced, so that the modified EMA layer and the hot CPET are subjected to hot melting and chemical reaction, and the effect of bonding the CPET and the EOE is achieved.
As a further improvement of the composite sheet with high temperature resistance and heat preservation, the EOE layer is formed by coextrusion of a modified EMA layer, a modified PE layer, an EVOH layer, a modified PE layer and a PE layer which are sequentially arranged. Such an arrangement may result in an improved barrier performance of the resulting composite sheet; wherein EVOH is ethylene/vinyl alcohol copolymer, PA is nylon, PE is polyethylene. The modified PE layer is a MAH grafted LLDPE copolymer.
As a further improvement of the composite sheet with high temperature resistance and heat preservation, the SPE layer is ethylene methyl acrylate copolymer, and the weight ratio of MA is 8-12%. The proportion can improve the transparency of the SPE, so that the composite sheet formed by compositing the CPET layer and the EPP layer through extrusion of the SPE has no residual solvent and has high transparency requirement.
The method for manufacturing the composite sheet with high temperature resistance and heat preservation effect comprises the following process steps: uniformly coating the adhesive on the CPET layer to form a glue layer, and compounding the CPET layer with the EPP layer and/or the EPS layer, drying and curing, wherein the glue application amount is 2.8-3.2g/m < 2 >, the drying temperature is 50-90 ℃, the curing temperature is 50-60 ℃, and the curing time is 40-80 hours; or comprises the following process steps: and (3) bonding the extruded CPET layer with an extruded SPE hot paste, and curing after hot paste, wherein the curing process is as follows: placing for 36 hours at 30-40 ℃, then placing for 12 hours at 25 ℃, curing and compositing with an EPP layer and/or an EPS layer; or comprises the following process steps: the extruded CPET layer is thermally bonded to the extruded EOE layer and the SPE layer is bonded between the extruded EOE layer and the extruded EPP layer and/or EPS layer. The composite sheet material prepared by the dry-process has good transparency, but the solvent residue is caused by the dry-process glue; the solvent residue is avoided by using an extrusion process, the resin is bonded by hot melt, the molecules generate polar oxidation groups under the action of oxygen at high temperature, the bonding force between the molecules is enhanced, and the solvent is not remained and the transparency is high by extrusion SPE.
As a further improvement of the method for producing the composite sheet with high temperature resistant and heat insulating effects of the present invention, the extrusion temperature: 240-320 ℃, extrusion speed: 80-120M/min.
As a further improvement of the method for manufacturing the composite sheet with high temperature resistance and heat preservation effect, the extrusion temperature is 280 ℃, and the extrusion speed is 90M/min.
The invention has the beneficial effects that:
1. through the multilayer composite structure, the product has high temperature resistance and heat preservation performance, improves the competitiveness of the content, reduces energy consumption of subsequent heating, and can meet the requirements of high temperature resistance and heat preservation of packaging of Chinese food and fried products;
2. the barrier property of the manufactured composite sheet is improved through the arrangement of the barrier material layer;
3. the composite sheet compounded by extrusion SPE has no residual solvent and high transparency.
Drawings
FIG. 1 is a schematic view of a layered structure of a first embodiment of a heat-resistant and insulating composite sheet material according to the present invention;
FIG. 2 is a schematic diagram of a hierarchical structure according to a second embodiment of the present invention;
FIG. 3 is a schematic diagram of a hierarchical structure according to a third embodiment of the present invention;
FIG. 4 is a diagram of a hierarchical structure according to a fourth embodiment of the present invention;
FIG. 5 is a schematic diagram of the hierarchy of the EOE layer of FIG. 4.
In the figure: 1. CPET layer 2, glue layer 3, EPP layer 4, EPS layer 5, SPE layer 6, EOE layer 7, modified PE layer 8, EVOH layer 10, PE layer.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings and examples. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
The Chinese and English contrast of each substance involved in the invention is as follows:
CPET crystallized polyethylene terephthalate
EPP polypropylene plastic foaming material
EPS polystyrene foam
SPE modified ethylene-methyl acrylate copolymer
EOE barrier material layer
APET non-crystallizing polyethylene terephthalate
PVC polyvinyl chloride
PP polypropylene
PS polystyrene
EVOH ethylene/vinyl alcohol copolymer
PA nylon
PE polyethylene
EMA ethylene-methyl acrylate copolymer
MA methyl acrylate
Embodiment one:
as shown in fig. 1, the composite sheet with high temperature resistance and heat preservation comprises a CPET layer 1, a glue layer 2 and an EPP layer 3 which are sequentially arranged, wherein the CPET layer, the glue layer 2 and the EPP layer 3 are compounded by a dry-process technology;
the method for manufacturing the composite sheet with high temperature resistance and heat preservation effect comprises the following process steps: and uniformly coating the adhesive on the CPET layer 1 to form a glue layer 2, compounding the CPET layer 1 and the EPP layer 3, drying and curing, wherein the sizing amount is 2.8-3.2g/m < 2 >, the drying temperature is 50-90 ℃, the curing temperature is 50-60 ℃, and the curing time is 40-80 hours.
Embodiment two:
the difference from the first embodiment is that: as shown in fig. 2, the composite sheet with high temperature resistance and heat preservation comprises a CPET layer 1, a glue layer 2 and an EPS layer 4 which are sequentially arranged, wherein the CPET layer, the glue layer 2 and the EPS layer 4 are compounded by a dry-process;
the method for manufacturing the composite sheet with high temperature resistance and heat preservation effect comprises the following process steps: and uniformly coating the adhesive on the CPET layer 1 to form a glue layer 2, compounding the CPET layer 1 and the EPS layer 4, drying and curing, wherein the sizing amount is 2.8-3.2g/m < 2 >, the drying temperature is 50-90 ℃, the curing temperature is 50-60 ℃, and the curing time is 40-80 hours.
Embodiment III:
the difference from the first embodiment is that, as shown in fig. 3, a composite sheet with high temperature resistance and heat preservation is formed by extruding an SPE layer 5 between an extruded CPET layer 1 and an EPP layer 3; the SPE layer 5 is ethylene methyl acrylate copolymer, and the weight ratio of MA is 8-12%.
The method for manufacturing the composite sheet with high temperature resistance and heat preservation effect comprises the following process steps: and (3) bonding the extruded CPET layer 1 with an extruded SPE hot paste, and curing after hot paste, wherein the curing process is as follows: placing for 36 hours at 30-40 ℃, then placing for 12 hours at 25 ℃, curing and compositing with the EPP layer 3. Wherein the extrusion temperature is 280 ℃, and the extrusion speed is 90M/min.
Embodiment four:
the difference from the first embodiment is that, as shown in fig. 4 and 5, a composite sheet with high temperature resistance and heat preservation comprises a CPET layer 1, an EOE layer 6, an SPE layer 5 and an EPS layer 4 which are sequentially arranged, wherein the extruded CPET layer is bonded with the extruded EOE layer by hot adhesion, and the SPE layer is bonded between the extruded EOE layer and the extruded EPP layer/or the EPS layer by extrusion. The EOE layer 6 is formed by co-extrusion of an SPE layer 5 (i.e. a modified EMA layer), a modified PE layer 7, an EVOH layer 8, a modified PE layer 7 and a PE layer 10 which are sequentially arranged. The SPE layer 5 is ethylene methyl acrylate copolymer, and the weight ratio of MA is 8-12%.
The method for manufacturing the composite sheet with high temperature resistance and heat preservation effect comprises the following process steps: the extruded CPET layer is thermally bonded to the extruded EOE layer and the SPE layer is bonded between the extruded EOE layer and the extruded EPP layer and/or EPS layer. Wherein the extrusion temperature is 300 ℃, and the extrusion speed is 80M/min.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the scope of the invention.
Claims (4)
1. The composite sheet with high temperature resistance and heat preservation is characterized by comprising a CPET layer, an EOE layer, an SPE layer and an EPP layer and/or an EPS layer which are sequentially arranged, wherein the extruded CPET layer is bonded with the extruded EOE layer by hot adhesion, and an SPE layer is bonded between the extruded EOE layer and the extruded EPP layer and/or the EPS layer by extrusion; the EOE layer is formed by co-extrusion of a modified EMA layer, a modified PE layer, an EV OH layer, a modified PE layer and a PE layer which are sequentially arranged; the SPE layer is ethylene methyl acrylate copolymer, and the weight ratio of MA is 8-12%.
2. A method for manufacturing a composite sheet with high temperature resistance and thermal insulation effect according to claim 1, comprising the following process steps: uniformly coating the adhesive on the CPET layer to form a glue layer, and compounding the CPET layer with the EPP layer and/or the EPS layer, drying and curing, wherein the glue application amount is 2.8-3.2g/m < 2 >, the drying temperature is 50-90 ℃, the curing temperature is 50-60 ℃, and the curing time is 40-80 hours; or comprises the following process steps: and (3) bonding the extruded CP ET layer with the extruded SPE hot paste, and curing after hot paste, wherein the curing process is as follows: placing for 36 hours at 30-40 ℃, then placing for 12 hours at 25 ℃, curing and compositing with an EPP layer and/or an EPS layer; or comprises the following process steps: the extruded CPET layer is thermally bonded to the extruded EOE layer and the SPE layer is bonded between the extruded EOE layer and the extruded EPP layer and/or EPS layer.
3. The method of manufacturing a composite sheet having a high temperature resistant, heat retaining effect according to claim 2, wherein the extrusion temperature: 240-320 ℃, extrusion speed: 80-120M/min.
4. The method for producing a composite sheet having a high temperature resistant and heat retaining effect according to claim 3, wherein the extrusion temperature is 280 ℃ and the extrusion speed is 90M/min.
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| CN201710594596.6A CN107351502B (en) | 2017-07-20 | 2017-07-20 | High-temperature-resistant and heat-insulating composite sheet and manufacturing method thereof |
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