CN114801391A - Composite sheet and preparation method thereof - Google Patents

Composite sheet and preparation method thereof Download PDF

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Publication number
CN114801391A
CN114801391A CN202110073376.5A CN202110073376A CN114801391A CN 114801391 A CN114801391 A CN 114801391A CN 202110073376 A CN202110073376 A CN 202110073376A CN 114801391 A CN114801391 A CN 114801391A
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China
Prior art keywords
layer
composite sheet
thickness
heat
printing
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Pending
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CN202110073376.5A
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Chinese (zh)
Inventor
崇政
王凤凯
李志国
宗学醒
宋继东
杨继龙
云瑞清
张春林
王磊
聂育丞
徐志
白文明
刘中生
康艳霞
刘赫莉
赵建强
侯旺
李树江
张敬华
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Inner Mongolia Mengniu Dairy Group Co Ltd
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Inner Mongolia Mengniu Dairy Group Co Ltd
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Application filed by Inner Mongolia Mengniu Dairy Group Co Ltd filed Critical Inner Mongolia Mengniu Dairy Group Co Ltd
Priority to CN202110073376.5A priority Critical patent/CN114801391A/en
Publication of CN114801391A publication Critical patent/CN114801391A/en
Pending legal-status Critical Current

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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
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • 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
    • 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
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • 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
    • 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
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92704—Temperature
    • 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
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • 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
    • 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
    • B32B2307/31—Heat sealable

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention provides a composite sheet and a preparation method thereof, wherein the composite sheet comprises the following components: the printing layer, the rigid layer and the high-resistance heat insulation sealing layer are sequentially stacked; the rigid layer is made of PET, PP or PE, the flexural modulus is 1200-2200 Mpa, and the thickness is 230-320 mu m. The composite sheet has the effects of convenience in printing, environmental friendliness and excellent blocking heat sealing performance, is suitable for solvent-free compounding, further achieves the aim of more environmental protection, and can be suitable for a hollow blow molding process or a plastic uptake molding process; and through the further optimization of printing layer and rigidity layer material and gross thickness, guarantee that the filling mouth size is stable after the shaping, avoid influencing the effect of the filling of later stage cheese, the effect is very excellent.

Description

Composite sheet and preparation method thereof
Technical Field
The invention relates to the technical field of packaging materials, in particular to a composite sheet and a preparation method thereof.
Background
The filling process of the conventional bar cheese comprises the following steps: firstly, folding a sheet material in half by a former, then making the sheet material into a rattle drum shape by a hollow blow molding process or a plastic suction molding process, wherein the sheet material is connected, and a plurality of small units with filling openings are formed in parallel on the sheet material; inserting the cheese stick into the small unit from the filling opening through the stick feeder, completely extending the cheese stick into the small unit, inserting the filling nozzle into the small unit from the filling opening, extruding a certain amount of cheese, and sealing the filling opening to realize transverse sealing; after sealing, cutting each small unit into a specified shape by a cutter to complete the packaging of the bar cheese.
Due to the limitation of the preparation process of the bar cheese, the outer packaging sheet of the bar cheese not only needs to be suitable for the requirements of the specific process of plastic sucking molding or hollow blow molding, but also needs to meet the heat sealing function; due to the characteristics of cheese, the sheet material is required to have the characteristics of high oxygen resistance and high moisture resistance, so that the requirement of shelf life is met. Therefore, the current materials currently applied to the outer packaging sheet for the bar cheese are generally PVC sheets and PS sheets.
However, PVC cannot be recycled, dioxin is generated due to combustion, the environment is damaged, PS cannot be recycled, and the sheets made of the two materials are both environmentally-friendly materials, so that the PVC is not suitable for long-term development.
In the prior art, although the PVC sheet and the PS sheet can be replaced by environment-friendly materials, the requirements of high oxygen resistance and high humidity resistance are met, and other high-barrier materials are required to be compounded to form the composite sheet. In order to meet the requirements of the hollow blow molding or plastic suction molding process, the conventional laminated composite sheet generally needs to adopt a solvent-based adhesive to compound the laminated structures. In the solvent-free composite sheet disclosed in the prior art, although the solvent-free composite sheet can achieve better environmental protection performance, the preparation requirement of the hollow blow molding or plastic suction molding process cannot be met under the condition of meeting high barrier performance, and the prepared bar cheese outer package is often unstable in size, especially the problem that the size of a filling opening is not consistent, so that the later-stage cheese filling is greatly influenced.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the problem that the composite sheet adopted in the bar cheese outer package in the prior art cannot effectively ensure that the formed composite material is suitable for the requirement of the hollow blow molding or plastic-sucking molding process of the bar cheese outer package under the condition that the environment-friendly performance and the high barrier performance are met, so that the composite sheet and the preparation method thereof are provided, and the composite sheet can solve the problems and is lower in cost.
A composite sheet comprises a printing layer, a rigid layer and a high-resistance heat-insulation sealing layer which are sequentially stacked;
the rigid layer is made of PET (polyethylene terephthalate), PP (polypropylene) or PE (polyethylene), the flexural modulus is 1200-2200 Mpa, and the thickness is 230-320 mu m.
The thickness of the rigid layer is 240-300 mu m.
The temperature resistance temperature of the printing layer is more than 160 ℃; preferably 160-200 ℃; or/and
the printing layer is made of PP, PET or PE; or/and
the thickness of the printing layer is 10-40 μm, preferably 10-25 μm.
When the printing layer is made of PET, the total thickness of the rigid layer and the printing layer is less than 340 mu m.
The high-resistance heat insulation sealing layer comprises a heat-seal base layer and a blocking layer, and the outermost layer on one side, far away from the rigid layer, is the heat-seal base layer.
The heat-seal basic unit is two-layer, and the barrier layer is the one deck, and the barrier layer is located between two-layer heat-seal basic unit.
The heat-seal base layer is made of PP, PET or PE, and preferably PE; or/and
the material of the barrier layer is EVOH (ethylene-vinyl alcohol copolymer).
The thickness of the high-resistance heat insulation sealing layer is 40-100 mu m, and preferably 40-80 mu m.
The thickness ratio of the heat-seal base layer to the barrier layer is (0.5-4): 1; preferably, the thickness ratio between the heat-seal base layer and the barrier layer is (2-4): 1.
A method of making a composite sheet comprising: respectively obtaining a sheet-shaped printing layer, a rigid layer and a high-resistance heat-insulation sealing layer; and compounding the sheet printing layer, the rigid layer and the high-resistance heat-insulation sealing layer by adopting a solvent-free compounding process.
The forming process of the rigid layer comprises the following steps: forming a sheet by adopting a pellet coextrusion production mode;
the control conditions of the co-extrusion production are as follows: sequentially staying for 1-3 s at 260-270 ℃, staying for 1-3 s at 275-290 ℃, staying for 1-3 s at 270-280 ℃, and finally extruding and molding at 255-265 ℃; the total time of co-extrusion production is 17-23 s.
The composite sheet or/and the composite sheet prepared by the preparation method are/is applied to preparing the outer package of the bar cheese.
The technical scheme of the invention has the following advantages:
1. the composite sheet provided by the invention comprises a printing layer and a high-resistance heat-insulation sealing layer, wherein a rigid layer is arranged between the printing layer and the high-resistance heat-insulation sealing layer, the material and parameter conditions of the rigid layer are optimized, specifically, the rigid layer is prepared by selecting PET, PP or PE material, the bending modulus of the rigid layer is set to be 1200-2200 MPa, and the thickness is set to be 230-320 mu m; through the aforesaid optimization, both can effectively reach the advantage of each layer itself, can realize the printing layer, the printing of being convenient for that rigid layer and high resistant thermal-insulated seal itself have, the environmental protection, separation heat sealability is excellent effect, and simultaneously, because it is PET to set up the material between printing layer and high resistant thermal-insulated seal, PP or PE's rigid layer, consequently, can effectively realize no solvent complex between layer and the layer, further reach the purpose of environmental protection, and, through the optimal design of above-mentioned parameter, especially the injecture of rigid layer flexural modulus and thickness, cooperate with the material, can effectively ensure this composite sheet and be applicable to the cavity blow molding technology or the plastic uptake molding technology of bar extranal packing cheese.
2. According to the invention, through further optimization of the materials and the total thickness of the printing layer and the rigid layer, specifically, when the rigid layer is made of PET and the printing layer is also made of PET, the total thickness of the rigid layer and the printing layer is set to be less than 340 mu m, under the condition of the thickness, the external package of the formed bar cheese and the size stability of the filling opening are effectively ensured, the effect of influencing the later-stage cheese filling is avoided, and the effect is very excellent.
3. The material selection and the thickness setting of the printing layer of the composite sheet are further optimized, specifically, the material of the printing layer is PP, PET or PE, preferably PET, the temperature resistance temperature of the printing layer is set to be more than 160 ℃, preferably 160-200 ℃, and meanwhile, the thickness of the printing layer is set to be 10-40 micrometers, preferably 10-25 micrometers; the arrangement can better meet the operation requirements of a heat sealing process and a hollow blow molding process or a plastic molding process. Particularly, the material type and performance of the printing layer are optimized, and the printing layer and the high-barrier heat-sealing layer are compounded into a whole through a solvent-free compounding process in combination with the optimization of the thickness, so that the use of adhesives with solvent carriers is avoided, and the environmental protection performance is greatly improved; meanwhile, the printing layer is optimized in material and thickness, has the effect of being instantly high-temperature and non-deformable, and can resist temperature of more than 150 ℃, so that the printing layer after printing cannot be curled and deformed in the process of being compounded with the high-resistance heat insulation sealing layer into a whole or forming the bar cheese outer package, and the purpose of exquisite printing of the bar cheese outer package can be achieved.
4. The structure of the high-resistance heat-insulation sealing layer is further optimized, the high-resistance heat-insulation sealing layer comprises a heat-seal base layer and a blocking layer, when the thickness of the high-resistance heat-insulation sealing layer is too high, the operation of a later-stage heat-seal process and a hollow blow molding process or a plastic suction molding process is not facilitated, but when the thickness of the high-resistance heat-insulation sealing layer is too low, the blocking effect cannot be achieved, so that the thickness of the high-resistance heat-insulation sealing layer is set to be 40-100 micrometers, and preferably 40-80 micrometers. Under the condition of the thickness, the film can be prepared by a co-extrusion film blowing process, so that the preparation cost is saved. The material and the structure of the heat-seal base layer and the barrier layer are further optimized, namely the high-resistance heat-insulation sealing layer is of a three-layer structure formed by sequentially arranging the heat-seal base layer, the barrier layer and the heat-seal base layer, meanwhile, the material of the heat-seal base layer is PP, PET or PE, preferably PE, and the material of the barrier layer is EVOH; through the arrangement, the high-resistance heat-insulation sealing layer can achieve proper barrier performance, is suitable for co-extrusion film blowing process forming, reduces production cost, can realize solvent-free compounding between the formed high-resistance heat-insulation sealing layer and the rigid layer, can ensure heat sealing effect, and is easy to uncover after heat sealing; therefore, the invention is more convenient for industrial production.
5. The structure of the invention can meet the requirements of bar cheese production process (plastic sucking molding or hollow blow molding) and the requirement of high barrier property of protective cheese; the equipment flow, the production efficiency and the like of the conventional bar cheese outer package production can be ensured to be unchanged; the sheet is green and environment-friendly, can be recycled, does not need to be treated by means of incineration and the like, and does not damage the environment. Meanwhile, the material cost adopted by the invention is lower than that of the existing PVC or PS material used for the outer packaging sheet material of the bar cheese, the cost can be saved by about 10-20%, the cost is lower, and the effect is more obvious. Therefore, the sheet disclosed by the invention can meet the requirements of exquisite printing, plastic-sucking forming, high barrier and environmental protection of the bar cheese external package; in addition, the invention can ensure the performance and realize thinner thickness through the optimization of the material, thereby greatly reducing the cost and being more suitable for the long-term development requirement of the industry.
6. The invention provides a forming process of a rigid layer, which specifically comprises the step of forming a sheet by adopting a pellet co-extrusion production mode, wherein the control conditions of the co-extrusion production are as follows: sequentially staying for 1-3 s at 260-270 ℃, staying for 1-3 s at 275-290 ℃, staying for 1-3 s at 270-280 ℃, and finally extruding and molding at 255-265 ℃; the total time of co-extrusion production is 17-23 s; through the optimization of the process conditions, the method can be effectively suitable for the forming of the sheet, and can ensure that the produced sheet can effectively meet the process requirements of preparing the bar cheese external package by hollow blow molding or plastic suction forming, and the filling opening of the formed bar cheese external package is stable in size and remarkable in effect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic view of the location of the filling opening of the outer package of the bar cheese prepared in example 1 of the present invention.
Fig. 2 is a schematic view of the location of the filling opening of the outer package of the bar cheese prepared in example 7 of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The examples do not show the specific experimental steps or conditions, and can be performed according to the conventional experimental steps described in the literature in the field. The reagents or instruments used are not indicated by manufacturers, and are all conventional reagent products which can be obtained commercially.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as there is no conflict between them.
Example 1
A composite sheet comprises a printing layer, a rigid layer and a high-resistance heat-insulation sealing layer; wherein the rigid layer is made of PET, PP or PE, has a flexural modulus of 1200-2200 MPa and a thickness of 230-320 mu m.
According to the invention, through the optimized setting, the advantages of each layer can be effectively achieved, namely, the printing layer, the rigid layer and the high-resistance heat insulation sealing layer have the effects of convenience for printing, environmental protection and excellent heat insulation sealing resistance, meanwhile, the rigid layer made of PET, PP or PE is arranged between the printing layer and the high-resistance heat insulation sealing layer, so that the solvent-free composition between the layers can be effectively realized, the purpose of environmental protection is further achieved, and the composite sheet can be ensured to be suitable for the hollow blow molding process or the plastic suction molding process of the bar cheese outer package through the optimized design of the parameters.
In order to achieve a more excellent effect, the thicknesses and the materials of the printing layer, the rigid layer and the high-resistance heat insulation sealing layer can be further optimized and screened.
As one of them optimization setting, through the optimization of printing layer and rigid layer material and gross thickness, it is concrete, when rigid layer and printing layer are the PET material, set up rigid layer and printing layer's gross thickness to be less than 340 mu m, at this moment, can effectively guarantee filling mouth size stability after the shaping, avoid influencing the effect of the filling of later stage cheese, the effect is very excellent.
As another optimized setting, the printing layer in the invention is only required to be made of a material capable of achieving the purpose of printing, so as to achieve the purpose of printing more delicately in order to avoid the occurrence of surface wrinkle ironing caused by high temperature in the forming process, and the printing layer is preferably made of a material with the temperature resistance higher than 160 ℃; the temperature resistance temperature is preferably 160-200 ℃; specifically, the printing layer is preferably made of PP, PET or PE with temperature resistance higher than 160 ℃, and is further preferably made of PET; or/and the thickness of the printing layer is 10-40 μm, preferably 10-25 μm. The printing surface of the printing layer is preferably arranged towards the direction of the rigid layer, namely the printing is carried out on the inner side of the printing layer, so that the printing effect of the printing pattern can be effectively kept exquisite in a longer time.
The high-resistance heat insulation sealing layer can be made of materials with heat sealing performance and barrier performance, and can also be made of materials with heat sealing performance and barrier performance in a composite mode. Preferably, the high-resistance heat-insulation sealing layer is formed by compounding a heat-seal base layer with heat-seal performance and a blocking layer with blocking performance; the material of the barrier layer can be selected from any barrier material capable of achieving better oxygen resistance and water resistance, the barrier layer is preferably made of EVOH, the thickness ratio between the heat-seal base layer and the barrier layer is (0.5-4): 1, and the thickness ratio between the heat-seal base layer and the barrier layer is (3-4): 1. Further, the material of the heat-seal base layer is preferably PP or PE, and more preferably PE.
The sheet material can be made into each layer structure through tape casting, and then each layer structure is compounded into the sheet material through a solvent-free compounding process. In order to simplify the preparation process and save the manufacturing cost, the heat-seal base layer and the barrier layer of the high-resistance heat-insulation sealing layer are firstly prepared into a composite layer through a coextrusion process, and then the high-resistance heat-insulation sealing layer, the printing layer and the rigid layer are compounded into a sheet through a solvent-free compounding process.
In order to enable the later heat sealing process to achieve a better heat sealing effect and meet the aim of solvent-free compounding among the printing layer, the rigid layer and the high-resistance heat insulation sealing layer, the heat sealing base layer is arranged into two layers, and specifically, the high-resistance heat insulation sealing layer is structurally arranged into the heat sealing base layer, the barrier layer and the heat sealing base layer in sequence.
In this embodiment, a composite sheet having the following specific structure is given, which comprises, from top to bottom, a printing layer, a rigid layer, a heat-seal base layer, a barrier layer, and a heat-seal base layer. The printing layer is made of 12-micron PET (polyethylene terephthalate) sheets, the type of PET is Pennovyl DPET12, and the temperature resistance temperature of the printing layer is 160 ℃; the rigid layer is a 250-micron PET sheet, the type of PET is ten thousand Ke WK-811, and the flexural modulus of the rigid layer is 1350 MPa; the model of the high-barrier heat-sealing layer is Jiangyin glow-rising PV1001EP, the thickness of the high-barrier heat-sealing layer is 50 mu m, and the high-barrier heat-sealing layer is made of the following materials: PE/EVOH/PE, thickness ratio: 22um/6um/22 um.
The specific preparation method of the composite sheet comprises the following steps:
(1) respectively obtaining a printing layer, a rigid layer and a high-resistance heat insulation seal layer;
the preparation process of the rigid layer is as follows: resin particles with the model of ten thousand Ke WK-811 are added into an extruder and are co-extruded to prepare a PET sheet with the thickness of 250 mu m. The temperature control conditions for co-extrusion in the extruder are as follows: a die area, 255-265 ℃, a first area, 260-270 ℃; a second zone, 275-290 ℃; a third region, 270-280 ℃; fourthly, 255-265 ℃; fifthly, 255-265 ℃; sixthly, 255-265 ℃; the second zone stayed 3s, the remaining zones 2.5s for a total of 18 s. Namely, after the granules sequentially pass through a die area, a first area, a second area, a third area, a fourth area, a fifth area and a sixth area, finally, the granules are extruded to form a sheet with a corresponding thickness.
(2) The compounding among the printing layer, the rigid layer and the high-resistance heat-insulation sealing layer is realized by adopting a solvent-free compounding process, the compounding speed is 60 m/min, and the curing time after compounding is 72 hours.
The performance of the composite sheet of this example was tested and the results are as follows:
the outer layer can resist 160 ℃ and has oxygen resistance of 0.17cm 3 /(m 2 24h 0.1 MPa); moisture barrier rate of 0.39 g/m2 × 24h, heat sealing strength of 8N/15mm, and sealing propertyThe current requirements of the plastic suction molding or the hollow blow molding of the bar cheese and the uniform molding of the cheese filling opening are shown in figure 1.
Example 2
The difference between this embodiment and embodiment 1 is that the thickness and material of each layer are different, and the specific configuration of this embodiment is as follows:
thickness of the printed layer 23 μm, mark number: DPET12 in China wind plastic industry, and the temperature resistance is 190 ℃;
the thickness of the rigid layer is 230 μm; the trade mark is as follows: huarun WB8863, flexural modulus 1200 MPa;
the thickness of the high-resistance heat insulation seal layer is 40 mu m; the trade mark is as follows: basf PB 8640; comprises the following components: PE/EVOH/PE, thickness ratio: 17.5um/5um/17.5 um.
When the printing layer, the rigid layer and the high-resistance heat-insulation sealing layer are compounded without solvent, the compounding speed is 50 m/min.
The performance of the composite sheet of this example was tested and the results are as follows:
the outer layer can resist 190 ℃ and has oxygen resistance of 0.19cm 3 /(m 2 24h 0.1 MPa); moisture resistance of 0.42g/m 2 24h and 6N/15mm of heat seal strength, and can meet the requirements of plastic suction molding or hollow blow molding of the bar cheese and uniform molding of cheese filling openings.
Example 3
The difference between this embodiment and embodiment 1 is that the thickness and material of each layer are different, and the specific configuration of this embodiment is as follows:
thickness of the printed layer 12 μm, mark number: the industrial polymerization DPET12 is resistant to the temperature of 160 ℃;
the thickness of the rigid layer is 280 mu m; the trade mark is as follows: wankai WK-821, flexural modulus 1950 MPa;
the thickness of the high-resistance heat insulation seal layer is 60 mu m; the trade mark is as follows: mitsubishi BL 6100; comprises the following components: PE/EVOH/PE, thickness ratio: 26um/8um/26 um.
The rigid layer was prepared by leaving the die area, the first area and the second area for 3s, and the remaining areas for 2s for a total of 17 s. When the printing layer, the rigid layer and the high-resistance heat-insulation sealing layer are compounded without solvent, the compounding speed is 80 m/min.
The performance of the composite sheet of this example was tested and the results are as follows:
the outer layer can resist 160 ℃ and has oxygen resistance of 0.15cm 3 /(m 2 24h 0.1 MPa); the moisture resistance rate is 0.36g/m 2 24h and the heat sealing strength is 10N/15mm, so that the requirements of plastic sucking molding or hollow blow molding of the bar cheese and uniform molding of a cheese filling opening can be met.
Example 4
The difference between this embodiment and embodiment 1 is that the thickness and material of each layer are different, and the specific configuration of this embodiment is as follows:
thickness of the printing layer is 8 μm, and mark: the prenavin DPET12 is resistant to the temperature of 140 ℃;
the thickness of the rigid layer is 250 μm; the trade mark is as follows: wankai WK-811, flexural modulus 1350 MPa;
the thickness of the high-resistance heat insulation seal layer is 50 mu m; the trade mark is as follows: jiangyin glow-raising PV1001 EP; comprises the following components: PE/EVOH/PE, thickness ratio: 22um/6um/22 um.
When the printing layer, the rigid layer and the high-resistance heat-insulation sealing layer are compounded without solvent, the compounding speed is 60 m/min.
The performance of the composite sheet of this example was tested and the results are as follows:
the outer layer can only resist 140 ℃, the surface of the bar cheese can be wrinkled during the hollow blow molding process of the bar cheese, but the requirement of uniform cheese filling opening molding of the bar cheese can be met.
Example 5
The difference between this embodiment and embodiment 1 is that the thickness and material of each layer are different, and the specific configuration of this embodiment is as follows:
thickness of the printed layer 23 μm, mark number: DPET12 in China wind plastic industry, and the temperature resistance is 190 ℃;
the thickness of the rigid layer is 230 μm; the trade mark is as follows: huarun WB8863, flexural modulus 1200 MPa;
the thickness of the high-resistance heat insulation seal layer is 30 mu m; the trade mark is as follows: basf PB 8640; comprises the following components: PE/EVOH/PE, thickness ratio: 12.5um/5um/12.5 um.
When the printing layer, the rigid layer and the high-resistance heat-insulation sealing layer are compounded without solvent, the compounding speed is 50 m/min, and the curing time is 12 hours.
The performance of the composite sheet of this example was tested and the results are as follows:
the heat sealing strength of the outer layer is 3N/15mm, the strength is too low, and poor sealing is caused; but can realize the requirement of uniform cheese filling opening forming of the bar cheese.
Example 6
The difference between this embodiment and embodiment 1 is that the thickness and material of each layer are different, and the specific configuration of this embodiment is as follows:
thickness of the printing layer is 8 μm, and mark: the prenavin DPET12 is resistant to the temperature of 140 ℃;
the thickness of the rigid layer is 320 μm; the trade mark is as follows: wankai WK-811, flexural modulus 2200 MPa;
the thickness of the high-resistance heat insulation seal layer is 40 mu m; the trade mark is as follows: basf PB 8640; comprises the following components: PE/EVOH/PE, thickness ratio: 17.5um/5um/17.5 um.
When the printing layer, the rigid layer and the high-resistance heat-insulation sealing layer are compounded without solvent, the compounding speed is 50 m/min.
The performance of the PET composite sheet of this example was tested, and the test results were as follows:
the outer layer can only resist 140 ℃, the surface of the bar cheese can be wrinkled during the hollow blow molding process of the bar cheese, the plastic suction molding or the hollow blow molding of the outer package of the bar cheese and the requirement of uniform molding of a cheese filling opening can be met, but the sheet is rigid, and the risk of brittle fracture occurs during the logistics transportation process.
Example 7
The difference between this embodiment and embodiment 1 is that the thickness and material of each layer are different, and the specific configuration of this embodiment is as follows:
thickness of the printed layer 23 μm, mark number: DPET12 in China wind plastic industry, and the temperature resistance is 190 ℃;
the thickness of the rigid layer is 320 μm; the trade mark is as follows: wankai WK-811, flexural modulus 2200 MPa;
the thickness of the high-resistance heat insulation seal layer is 50 mu m; the trade mark is: mitsubishi BL 6100; comprises the following components: PE/EVOH/PE, thickness ratio: 21um/8um/21 um.
When the printing layer, the rigid layer and the high-resistance heat-insulation sealing layer are compounded without solvent, the compounding speed is 80 m/min.
The printing layer and the rigid layer are both made of PET, when the total thickness of the rigid layer and the printing layer is larger than 340 μm, due to the increase of the total thickness, although the plastic-sucking molding or hollow blow molding of the outer package of the bar cheese can be realized, the filling openings have different sizes, as shown in figure 2.
Comparative example 1
The difference between this embodiment and embodiment 1 is that the thickness and material of each layer are different, and the specific configuration of this embodiment is as follows:
thickness of the printed layer 12 μm, mark number: the industrial polymerization DPET12 is resistant to the temperature of 160 ℃;
the thickness of the rigid layer is 180 mu m; the trade mark is as follows: wankai WK-821, flexural modulus 750 MPa;
the thickness of the high-resistance heat insulation seal layer is 50 mu m; the trade mark is as follows: mitsubishi BL 6100; comprises the following components: PE/EVOH/PE, thickness ratio: 21um/8um/21 um.
When the printing layer, the rigid layer and the high-resistance heat-insulation sealing layer are compounded without solvent, the compounding speed is 80 m/min.
The composite sheet of this example was tested for performance, and the results were as follows:
the sheet material is softer, can't realize the plastic uptake shaping or the hollow blow molding shaping of bar cheese.
Comparative example 2
The difference between this embodiment and embodiment 1 is that the thickness and material of each layer are different, and the specific configuration of this embodiment is as follows:
thickness of the printed layer 12 μm, mark number: the industrial polymerization DPET12 is resistant to the temperature of 160 ℃;
the thickness of the rigid layer is 320 μm; the trade mark is as follows: wankeli WK-821, flexural modulus 2500 MPa;
the thickness of the high-resistance heat insulation seal layer is 50 mu m; the trade mark is as follows: mitsubishi BL 6100; comprises the following components: PE/EVOH/PE, thickness ratio: 21um/8um/21 um.
When the printing layer, the rigid layer and the high-resistance heat-insulation sealing layer are compounded without solvent, the compounding speed is 80 m/min.
The performance of the composite sheet of this example was tested and the results are as follows:
the rigidity of the sheet is too strong, hollow blow molding and plastic suction molding of the bar cheese outer package cannot be realized, and the sheet fracture condition can occur in the process of hollow blow molding and plastic suction molding.
Comparative example 3
The difference between this embodiment and embodiment 1 is that, the preparation process of the rigid layer is different, and the specific configuration of this embodiment is as follows:
the thickness of the rigid layer is 250 μm; the trade mark is as follows: wankai WK-811. The rigid layer was prepared with zones 1-3 each for 3s, the remaining zones for 4s, for a total of 25 s.
When the preparation time of the rigid layer is long, although the rigid layer can still present a sheet shape, the sheet can have an uneven condition (an arc state), and cannot be compounded in the later period, so that the sheet with the machine-shaping function cannot be prepared. Through detection, the following results are obtained: when the co-extrusion time exceeds 23s, the forming control of the sheet material has obvious deviation, unevenness and the like.
It should be understood that the above-described embodiments are merely examples for clarity of description and are not intended to limit the scope of the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This list is neither intended to be exhaustive nor exhaustive. And obvious variations or modifications therefrom are within the scope of the invention.

Claims (11)

1. The composite sheet is characterized by comprising a printing layer, a rigid layer and a high-resistance heat-insulation sealing layer which are sequentially stacked;
the rigid layer is made of PET, PP or PE, the flexural modulus is 1200-2200 Mpa, and the thickness is 230-320 mu m.
2. The composite sheet according to claim 1, wherein the rigid layer has a thickness of 240 to 300 μm.
3. The composite sheet of claim 1 or 2, wherein the print layer is temperature resistant to greater than 160 ℃; preferably 160-200 ℃; or/and
the printing layer is made of PP, PET or PE; or/and
the thickness of the printing layer is 10-40 μm, preferably 10-25 μm.
4. The composite sheet according to any one of claims 1 to 3, wherein when the printing layer is made of PET, the total thickness of the rigid layer and the printing layer is less than 340 μm.
5. The composite sheet material of claim 4 wherein the high resistance heat seal comprises a heat seal base layer and a barrier layer, the outermost layer on the side away from the rigid layer being the heat seal base layer; preferably, the heat-seal basic unit is two-layer, and the barrier layer is the one deck, and the barrier layer is located between two-layer heat-seal basic unit.
6. The composite sheet material according to claim 5, wherein the heat-seal substrate is made of PP, PET or PE, preferably PE; or/and
the barrier layer is made of EVOH.
7. The composite sheet according to claim 5 or 6, wherein the thickness of the high-resistance heat-insulating seal layer is 40 to 100 μm, preferably 40 to 80 μm.
8. The composite sheet according to any one of claims 5 to 7, wherein the thickness ratio between the heat-sealed base layer and the barrier layer is (0.5-4): 1, and preferably the thickness ratio between the heat-sealed base layer and the barrier layer is (2-4): 1.
9. The method of making a composite sheet according to any one of claims 1 to 8, comprising: respectively obtaining a sheet-shaped printing layer, a rigid layer and a high-resistance heat-insulation sealing layer;
and compounding the sheet printing layer, the rigid layer and the high-resistance heat-insulation sealing layer by adopting a solvent-free compounding process.
10. The method for preparing the composite material according to claim 9, wherein the rigid layer is formed by a process comprising: forming a sheet by adopting a pellet coextrusion production mode;
the control conditions of the co-extrusion production are as follows: sequentially staying for 1-3 s at 255-265 ℃, staying for 1-3 s at 260-270 ℃, staying for 1-3 s at 275-290 ℃, staying for 1-3 s at 270-280 ℃, and then extruding and molding at 255-265 ℃; the total time of co-extrusion production is 17-23 s.
11. Use of a composite sheet according to any one of claims 1 to 8, or/and a composite sheet produced by the method of manufacture of claim 9 or 10, in the manufacture of a bar cheese overwrap.
CN202110073376.5A 2021-01-20 2021-01-20 Composite sheet and preparation method thereof Pending CN114801391A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030132657A1 (en) * 2002-01-17 2003-07-17 Dibattista Gerald A. Molded article having a rigid support and a flexible hollow member
CN106584953A (en) * 2016-11-14 2017-04-26 湖北宏裕新型包材股份有限公司 Automatic packaging composite film for betel nuts and preparation method of automatic packaging composite film
CN108943953A (en) * 2018-07-16 2018-12-07 湖北宏裕新型包材股份有限公司 A kind of suitable altitude environment dilated food gas flush packaging composite membrane and preparation method thereof
CN111100380A (en) * 2018-10-25 2020-05-05 中国石油化工股份有限公司 Polypropylene resin for hot-filling bottle
CN111716849A (en) * 2020-03-30 2020-09-29 上海艾录包装股份有限公司 Novel heat-seal easy-to-tear type blister packaging material
WO2020213471A1 (en) * 2019-04-18 2020-10-22 東洋紡株式会社 Polyester-based sealant film and packaging using same

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030132657A1 (en) * 2002-01-17 2003-07-17 Dibattista Gerald A. Molded article having a rigid support and a flexible hollow member
CN106584953A (en) * 2016-11-14 2017-04-26 湖北宏裕新型包材股份有限公司 Automatic packaging composite film for betel nuts and preparation method of automatic packaging composite film
CN108943953A (en) * 2018-07-16 2018-12-07 湖北宏裕新型包材股份有限公司 A kind of suitable altitude environment dilated food gas flush packaging composite membrane and preparation method thereof
CN111100380A (en) * 2018-10-25 2020-05-05 中国石油化工股份有限公司 Polypropylene resin for hot-filling bottle
WO2020213471A1 (en) * 2019-04-18 2020-10-22 東洋紡株式会社 Polyester-based sealant film and packaging using same
CN111716849A (en) * 2020-03-30 2020-09-29 上海艾录包装股份有限公司 Novel heat-seal easy-to-tear type blister packaging material

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