CN114603958A - Heat shrinkable film and preparation method thereof - Google Patents
Heat shrinkable film and preparation method thereof Download PDFInfo
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- CN114603958A CN114603958A CN202210231848.XA CN202210231848A CN114603958A CN 114603958 A CN114603958 A CN 114603958A CN 202210231848 A CN202210231848 A CN 202210231848A CN 114603958 A CN114603958 A CN 114603958A
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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
- 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
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0017—Combinations of extrusion moulding with other shaping operations combined with blow-moulding or thermoforming
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- 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
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
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- 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
- B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
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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
- 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
- B32B7/02—Physical, chemical or physicochemical properties
- B32B7/027—Thermal properties
- B32B7/028—Heat-shrinkability
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
- B29K2023/0608—PE, i.e. polyethylene characterised by its density
- B29K2023/0625—LLDPE, i.e. linear low density polyethylene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
- B29K2023/0608—PE, i.e. polyethylene characterised by its density
- B29K2023/065—HDPE, i.e. high density polyethylene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2007/00—Flat articles, e.g. films or sheets
- B29L2007/008—Wide strips, e.g. films, webs
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- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
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- C08J2323/06—Polyethene
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/08—Copolymers of ethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/06—Polyethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/08—Copolymers of ethene
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Abstract
The invention provides a heat shrinkable film and a preparation method thereof, which relate to the technical field of packaging materials and comprise an outer layer, a secondary outer layer, a middle layer, a secondary inner layer and an inner layer which are contacted in sequence, wherein the raw materials of the outer layer, the secondary inner layer and the inner layer comprise high-density polyethylene, linear low-density polyethylene, metallocene polyethylene and functional master batch, and the raw material of the middle layer comprises high-density polyethylene, linear low-density polyethylene and metallocene polyethylene; the raw materials of the heat shrinkable film do not contain low-density polyethylene materials, a specific raw material ratio is adopted, the traditional blowing process is delayed in the preparation method, and the shrinkage rate of the polyethylene composition is enhanced, so that the technical problem that the polyethylene composition is very dependent on the low-density polyethylene materials in the field is solved, other polyethylene is used for replacing the low-density polyethylene, the manufacturing cost of the heat shrinkable film is greatly reduced, the shrinkage rate, the tensile property and the puncture resistance of the heat shrinkable film are improved, and the economic benefit of the heat shrinkable film is enhanced.
Description
Technical Field
The invention relates to the technical field of packaging materials, in particular to a heat shrinkable film and a preparation method thereof.
Background
The heat shrinkable film is a commonly used packaging material at present, is widely applied to the fields of fast food, mechanical parts, building materials and the like, has good shrinkability, puncture resistance and transparency, is particularly suitable for packaging large-size and irregular objects, solves the problem of packaging special-shaped objects, can partially replace cartons and wooden boxes for packaging, and greatly reduces the packaging cost of enterprises; the packaging process and equipment are simple, the operation is convenient, the mechanization is easy to realize, the labor and the material resources can be saved, and the packaging efficiency is improved; the heat shrinkable film can be tightly attached to the commodity after being shrunk, the package is compact, the appearance of the commodity can be displayed, the attractiveness of the commodity package is enhanced, and the heat shrinkable film has a very wide application prospect and considerable research value in the field of packaging.
The existing heat shrinkable film adopts various polyethylene materials as raw materials, wherein low-density polyethylene is very dependent on low-density polyethylene due to the characteristic of high heat shrinkage rate, and the traditional heat shrinkable film is an indispensable main material. However, compared with high density polyethylene, low density polyethylene has higher production cost, poor puncture resistance, small tension and other defects, so that the economic benefit of the heat shrinkable film is lower.
Disclosure of Invention
The invention aims to provide a heat shrinkable film to solve the problem that the existing heat shrinkable film depends on low-density polyethylene as a main material, has poor puncture resistance and tensile property and causes low economic benefit.
In order to solve the problems, the invention firstly provides a heat shrinkable film which comprises an outer layer, a secondary outer layer, a middle layer, a secondary inner layer and an inner layer which are contacted in sequence, wherein the raw materials of the outer layer, the secondary inner layer and the inner layer respectively comprise high-density polyethylene, linear low-density polyethylene, metallocene polyethylene and functional master batch, and the raw material of the middle layer comprises high-density polyethylene, linear low-density polyethylene and metallocene polyethylene.
Further, the mass ratio of the high-density polyethylene, the linear low-density polyethylene, the metallocene polyethylene and the functional master batch in the raw materials of the outer layer is 30-70%: 25-35%: 0-20%: 5 to 10 percent.
Further, the mass ratio of the high-density polyethylene, the linear low-density polyethylene, the metallocene polyethylene and the functional master batch in the raw materials of the secondary outer layer and the secondary inner layer is 20-40%: 25-35%: 20-30%: 5 to 10 percent.
Further, the mass ratio of the high-density polyethylene, the linear low-density polyethylene and the metallocene polyethylene in the raw materials of the middle layer is 30-45%: 20-40%: 25 to 35 percent.
Further, the mass ratio of the high-density polyethylene, the linear low-density polyethylene, the metallocene polyethylene and the functional master batch in the raw materials of the inner layer is 20-50%: 10-25%: 35-45%: 2 to 8 percent.
Further, the ratio of the thicknesses of the outer layer, the secondary outer layer, the intermediate layer, the secondary inner layer and the inner layer is 2: 1: 2: 1: 2.
in order to solve the above problems, the present invention also provides a method for preparing the heat shrinkable film of the above technical solution, comprising the steps of: mixing raw materials, namely adding the raw materials into a stirrer to be mechanically mixed to form a mixed material; melting the mixed materials, adding the mixed materials into an extruder for melt mixing, and extruding to obtain a polyethylene composition; delaying the blowing, naturally cooling the polyethylene composition for 5-80s, and then carrying out a blowing process; and stretching and blowing, namely longitudinally stretching and transversely blowing the polyethylene composition by using equipment to obtain the formed heat shrinkable film.
Further, the stretching ratio of the stretching and blowing step is 1: 10-40.
Further, the blow-up ratio of the blow-up process is 1: 4-8.
Further, the high density polyethylene has a melt index <0.08g/10min, the linear low density polyethylene has a melt index <1.0g/10min, and the metallocene polyethylene has a melt index <1.0g/10 min.
According to the heat shrinkable film and the preparation method thereof provided by the invention, high-density polyethylene, linear low-density polyethylene, metallocene polyethylene and functional master batch are used as raw materials, a specific raw material proportion is applied, the traditional blowing process is delayed in the preparation method, and the shrinkage of the polyethylene composition is enhanced, so that the technical problem of low-density polyethylene materials which are very dependent in the field is solved, other polyethylenes are used for replacing low-density polyethylene, the shrinkage, the tensile property and the puncture resistance of the heat shrinkable film are improved, the manufacturing cost of the heat shrinkable film is greatly reduced, and the economic benefit of the heat shrinkable film is enhanced.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Firstly, the invention provides a heat shrinkable film, which comprises an outer layer, a secondary outer layer, a middle layer, a secondary inner layer and an inner layer which are contacted in sequence, wherein the high-density polyethylene, the linear low-density polyethylene, the metallocene polyethylene and the functional master batch are all proprietary names of materials commonly used in the field, wherein the high-density polyethylene is also called low-pressure polyethylene (HDPE for short) and has higher rigidity and toughness; the linear low density polyethylene (LLDPE for short) has narrower molecular weight distribution than the common LDPE, and has better tensile strength, tear strength, environmental stress crack resistance, puncture resistance and the like; metallocene polyethylene (mPE for short) has high crystallinity, good transparency and toughness; the functional master batch is a concentrate of various plastic additives, and the additives are not easy to disperse when being directly added, so that the use efficiency is not high, and the functional master batch is often added in a form of the functional master batch; the mass ratio of the high-density polyethylene, the linear low-density polyethylene, the metallocene polyethylene and the functional master batch in the raw materials of the outer layer is 30-70%: 25-35%: 0-20%: 5 to 10 percent; the mass ratio of the high-density polyethylene, the linear low-density polyethylene, the metallocene polyethylene and the functional master batch in the raw materials of the secondary outer layer and the secondary inner layer is 20-40%: 25-35%: 20-30%: 5 to 10 percent; the mass ratio of the high-density polyethylene, the linear low-density polyethylene and the metallocene polyethylene in the raw materials of the middle layer is 30-45%: 20-40%: 25 to 35 percent; the mass ratio of the high-density polyethylene, the linear low-density polyethylene, the metallocene polyethylene and the functional master batch in the raw materials of the inner layer is 20-50%: 10-25%: 35-45%: 2 to 8 percent; and the ratio of the thicknesses of the outer layer, the sub-outer layer, the intermediate layer, the sub-inner layer and the inner layer is 2: 1: 2: 1: 2.
setting the thickness ratio of the outer layer, the secondary outer layer, the middle layer, the secondary inner layer and the inner layer of the heat shrinkable film as 2: 1: 2: 1: 2, the outer layer and the inner layer, the secondary outer layer and the secondary inner layer are symmetrically arranged along the middle layer respectively on the structure, the structural stability of the heat shrinkable film is enhanced, the five layers of films are alternately thick, the outer layer, the inner layer and the middle layer are thicker, and the secondary outer layer and the secondary inner layer are thinner, so that the toughness and the tensile property of the heat shrinkable film are improved.
The invention also provides a preparation method of the heat shrinkable film, which comprises the following steps:
mixing raw materials, namely adding the raw materials into a stirrer to be mechanically mixed to form a mixed material; melting the mixed materials, adding the mixed materials into an extruder for melting and mixing, and extruding to obtain a polyethylene composition; delaying the blowing, naturally cooling the polyethylene composition for 5-80s, and then carrying out a blowing process; stretching and blowing, namely longitudinally stretching and transversely blowing the polyethylene composition by using equipment, wherein the blowing ratio is 1: 4-8, the stretching ratio is 1:10-40, and obtaining the molded heat shrinkable film.
In addition, the delayed inflation process is because the inventor researches and discovers that after the traditional inflation process is delayed for 5-80s, the contractibility of the high-density polyethylene can be improved, and the optimal inflation ratio, stretching ratio and excellent raw material proportion are matched, so that the problem of cost increase caused by excessive dependence on the low-density polyethylene due to high contractibility rate of the low-density polyethylene in the prior art can be solved, the low-density polyethylene material is not required to be added into the raw material of the heat shrinkable film, the application of the high-low polyethylene is increased, the production cost of the heat shrinkable film is reduced, the contractibility rate, the stretching performance and the puncture resistance of the heat shrinkable film are improved, and the economic benefit of the heat shrinkable film is enhanced.
Wherein the melt index of the high density polyethylene is less than 0.08g/10min, the melt index of the linear low density polyethylene is less than 1.0g/10min, and the melt index of the metallocene polyethylene is less than 1.0g/10 min.
Example 1
The heat shrinkable film provided by the embodiment comprises an outer layer, a secondary outer layer, a middle layer, a secondary inner layer and an inner layer which are sequentially contacted, wherein the mass ratio of the high-density polyethylene, the linear low-density polyethylene, the metallocene polyethylene and the functional master batch in the raw materials of the outer layer is 65%: 30%: 0%: 5 percent; the mass ratio of the medium-high density polyethylene, the linear low density polyethylene, the metallocene polyethylene and the functional master batch in the raw materials of the secondary outer layer and the secondary inner layer is 35 percent: 30%: 30%: 5 percent; the mass ratio of the high-density polyethylene, the linear low-density polyethylene and the metallocene polyethylene in the raw materials of the middle layer is 30%: 35%: 35 percent; the mass ratio of the high-density polyethylene, the linear low-density polyethylene, the metallocene polyethylene and the functional master batch in the raw materials of the inner layer is 35%: 20%: 40%: 5 percent; the thickness ratio of the outer layer to the secondary outer layer to the intermediate layer to the secondary inner layer to the inner layer is 2: 1: 2: 1: 2.
the preparation method of the heat shrinkable film provided by the embodiment comprises the following steps:
mixing raw materials, namely adding the raw materials into a stirrer to be mechanically mixed to form a mixed material; melting the mixed materials, adding the mixed materials into an extruder for melting and mixing, and extruding to obtain a polyethylene composition; delaying inflation, and naturally cooling the polyethylene composition for 20s, and then carrying out an inflation process; stretching and blowing, namely longitudinally stretching and transversely blowing the polyethylene composition by using equipment, wherein the blowing ratio is 1: 5, the stretching ratio is 1: 30, obtaining the molded heat shrinkable film.
Wherein the parameters of the various materials are as follows:
the density of the high-density polyethylene is 0.95g/cm3, and the melt index is 0.05g/10 min;
the linear low density polyethylene has a density of 0.925g/cm3 and a melt index of 0.8g/10 min;
the metallocene polyethylene had a density of 0.92g/cm3 and a melt index of 0.9g/10 min.
Example 2
The heat shrinkable film provided by the embodiment comprises an outer layer, a secondary outer layer, a middle layer, a secondary inner layer and an inner layer which are sequentially contacted, wherein the mass ratio of the high-density polyethylene, the linear low-density polyethylene, the metallocene polyethylene and the functional master batch in the raw materials of the outer layer is 50%: 30%: 15%: 5 percent; the mass ratio of the high-density polyethylene, the linear low-density polyethylene, the metallocene polyethylene and the functional master batch in the raw materials of the secondary outer layer and the secondary inner layer is 30%: 30%: 35%: 5 percent; the mass ratio of the high-density polyethylene, the linear low-density polyethylene and the metallocene polyethylene in the raw materials of the middle layer is 30%: 35 percent: 35 percent; the mass ratio of the high-density polyethylene, the linear low-density polyethylene, the metallocene polyethylene and the functional master batch in the raw materials of the inner layer is 30%: 25%: 40%: 5 percent; the thickness ratio of the outer layer, the secondary outer layer, the middle layer, the secondary inner layer and the inner layer is 2: 1: 2: 1: 2.
the preparation method of the heat shrinkable film provided by the embodiment comprises the following steps:
mixing raw materials, namely adding the raw materials into a stirrer to be mechanically mixed to form a mixed material; melting the mixed materials, adding the mixed materials into an extruder for melting and mixing, and extruding to obtain a polyethylene composition; delaying inflation, and naturally cooling the polyethylene composition for 30s, and then carrying out an inflation process; stretching and blowing, namely longitudinally stretching and transversely blowing the polyethylene composition by using equipment, wherein the blowing ratio is 1: 6, stretch ratio of 1: 40, obtaining the molded heat shrinkable film.
Wherein the parameters of the various materials are as follows:
the density of the high-density polyethylene is 0.96g/cm3, and the melt index is 0.07g/10 min;
the linear low density polyethylene has a density of 0.92g/cm3 and a melt index of 0.95g/10 min;
the metallocene polyethylene had a density of 0.925g/cm3 and a melt index of 0.85g/10 min.
Example 3
The heat shrinkable film provided by the embodiment comprises an outer layer, a secondary outer layer, a middle layer, a secondary inner layer and an inner layer which are sequentially contacted, wherein the mass ratio of the high-density polyethylene, the linear low-density polyethylene, the metallocene polyethylene and the functional master batch in the raw materials of the outer layer is 50%: 25%: 20%: 5 percent; the mass ratio of the high-density polyethylene, the linear low-density polyethylene, the metallocene polyethylene and the functional master batch in the raw materials of the secondary outer layer and the secondary inner layer is 30%: 25%: 35%: 10 percent; the mass ratio of the high-density polyethylene, the linear low-density polyethylene and the metallocene polyethylene in the raw materials of the middle layer is 35%: 30%: 35 percent; the mass ratio of the high-density polyethylene, the linear low-density polyethylene, the metallocene polyethylene and the functional master batch in the raw materials of the inner layer is 35%: 22%: 35 percent: 8 percent; the thickness ratio of the outer layer, the secondary outer layer, the middle layer, the secondary inner layer and the inner layer is 2: 1: 2: 1: 2.
the preparation method of the heat shrinkable film provided by the embodiment comprises the following steps:
mixing raw materials, namely adding the raw materials into a stirrer to be mechanically mixed to form a mixed material; melting the mixed materials, adding the mixed materials into an extruder for melting and mixing, and extruding to obtain a polyethylene composition; delay the blowing, after said polyethylene composition cools naturally for 50s, carry on the blowing process; stretch-blow, longitudinally stretching and transversely blowing the polyethylene composition with equipment, wherein the blow-up ratio is 1: 7, stretch ratio of 1: 20, obtaining the molded heat shrinkable film.
Wherein the parameters of the various materials are as follows:
the density of the high-density polyethylene is 0.95g/cm3, and the melt index is 0.04g/10 min;
the linear low density polyethylene has a density of 0.915g/cm3 and a melt index of 0.9g/10 min;
the metallocene polyethylene had a density of 0.91g/cm3 and a melt index of 0.9g/10 min.
Example 4
The heat shrinkable film provided by the embodiment comprises an outer layer, a secondary outer layer, a middle layer, a secondary inner layer and an inner layer which are contacted in sequence, wherein the mass ratio of the high-density polyethylene, the linear low-density polyethylene, the metallocene polyethylene and the functional master batch in the raw materials of the outer layer is 60%: 15%: 20%: 5 percent; the mass ratio of the high-density polyethylene, the linear low-density polyethylene, the metallocene polyethylene and the functional master batch in the raw materials of the secondary outer layer and the secondary inner layer is 40%: 25%: 30%: 5 percent; the mass ratio of the high-density polyethylene, the linear low-density polyethylene and the metallocene polyethylene in the raw materials of the middle layer is 35%: 30%: 35 percent; the mass ratio of the high-density polyethylene, the linear low-density polyethylene, the metallocene polyethylene and the functional master batch in the raw materials of the inner layer is 40%: 10%: 45%: 5 percent; the thickness ratio of the outer layer, the secondary outer layer, the middle layer, the secondary inner layer and the inner layer is 2: 1: 2: 1: 2.
the preparation method of the heat shrinkable film provided by the embodiment comprises the following steps:
mixing raw materials, namely adding the raw materials into a stirrer to be mechanically mixed to form a mixed material; melting the mixed materials, adding the mixed materials into an extruder for melting and mixing, and extruding to obtain a polyethylene composition; delaying inflation, and naturally cooling the polyethylene composition for 60s, and then carrying out an inflation process; stretching and blowing, namely longitudinally stretching and transversely blowing the polyethylene composition by using equipment, wherein the blowing ratio is 1: 8, stretch ratio of 1: and 30, obtaining the molded heat shrinkable film.
Wherein the parameters of the various materials are as follows:
the density of the high-density polyethylene is 0.97g/cm3, and the melt index is 0.06g/10 min;
the linear low density polyethylene has a density of 0.915g/cm3 and a melt index of 0.8g/10 min;
the metallocene polyethylene had a density of 0.925g/cm3 and a melt index of 0.85g/10 min.
Comparative example 1
The heat shrinkable film comprises an outer layer, a secondary outer layer, a middle layer, a secondary inner layer and an inner layer which are contacted in sequence, wherein the mass ratio of the low-density polyethylene, the high-density polyethylene, the medium-density polyethylene and the linear low-density polyethylene in the raw materials of the outer layer and the inner layer is 30%: 35%: 25%: 10 percent; the mass ratio of the low-density polyethylene, the linear low-density polyethylene and the metallocene linear low-density polyethylene in the raw materials of the secondary outer layer and the secondary inner layer is 30%: 10%: 60 percent; the mass ratio of the high-density polyethylene, the low-density polyethylene and the medium-density polyethylene in the raw materials of the middle layer is 50%: 40%: 310%; (ii) a The thickness ratio of the outer layer, the secondary outer layer, the middle layer, the secondary inner layer and the inner layer is 3: 1: 5: 1: 3.
wherein the parameters of the various materials are as follows:
the low density polyethylene has a density of 0.92g/cm3 and a melt index of 0.25g/10 min;
the density of the high-density polyethylene is 0.96g/cm3, and the melt index is 0.2g/10 min;
the medium density polyethylene has a density of 0.94g/cm3 and a melt index of 0.7g/10 min;
the linear low density polyethylene has a density of 0.915g/cm3 and a melt index of 1.7g/10 min;
the metallocene linear low density polyethylene had a density of 0.917g/cm3 and a melt index of 0.8g/10 min.
The heat shrinkable films prepared in examples 1 to 4 and comparative example 1 were subjected to shrinkage, tensile strength, tensile elongation at break and puncture strength tests, respectively, as shown in table 1, and the test means were as follows:
(1) shrinkage rate: the determination was carried out according to the method specified in GB/T34848-2017;
(2) tensile strength, tensile elongation at break: the measurement was carried out according to the method prescribed in GB/T1040.3-2006;
(3) puncture strength: the measurement is carried out according to the method specified in GB/T10004-2008;
TABLE 1
From the results in table 1, it can be seen that the heat shrinkable films of examples 1 to 4 have better shrinkage, tensile property and puncture resistance, and the heat shrinkable films provided by the present invention solve the problem of relying on low density polyethylene as the raw material of the heat shrinkable films in the art, thereby greatly reducing the manufacturing cost, improving the toughness and puncture resistance of the conventional heat shrinkable films, and improving the economic benefits of the heat shrinkable films as a whole.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The heat shrinkable film comprises an outer layer, a secondary outer layer, a middle layer, a secondary inner layer and an inner layer which are sequentially contacted, and is characterized in that raw materials of the outer layer, the secondary inner layer and the inner layer respectively comprise high-density polyethylene, linear low-density polyethylene, metallocene polyethylene and functional master batch, and raw materials of the middle layer comprise high-density polyethylene, linear low-density polyethylene and metallocene polyethylene.
2. The heat shrinkable film of claim 1, wherein the mass ratio of the high-density polyethylene, the linear low-density polyethylene, the metallocene polyethylene and the functional master batch in the raw material of the outer layer is 30-70%: 25-35%: 0-20%: 5 to 10 percent.
3. The heat shrinkable film of claim 1, wherein the weight ratio of the high density polyethylene, the linear low density polyethylene, the metallocene polyethylene and the functional master batch in the raw materials of the secondary outer layer and the secondary inner layer is 20-40%: 25-35%: 20-30%: 5 to 10 percent.
4. The heat shrinkable film of claim 1, wherein the mass ratio of the high density polyethylene, the linear low density polyethylene and the metallocene polyethylene in the raw material of the intermediate layer is 30 to 45%: 20-40%: 25 to 35 percent.
5. The heat shrinkable film of claim 1, wherein the mass ratio of the high-density polyethylene, the linear low-density polyethylene, the metallocene polyethylene and the functional master batch in the raw material of the inner layer is 20-50%: 10-25%: 35-45%: 2 to 8 percent.
6. The heat shrink film of claim 1, wherein the ratio of the thicknesses of the outer layer, the secondary outer layer, the intermediate layer, the secondary inner layer and the inner layer is 2: 1: 2: 1: 2.
7. a process for the preparation of a heat shrinkable film according to any one of claims 1 to 6, comprising the steps of:
mixing the raw materials, namely adding the raw materials into a stirrer for mechanical mixing to form a mixed material;
melting the mixed materials, adding the mixed materials into an extruder for melt mixing, and extruding to obtain a polyethylene composition;
delay the blowing, after said polyethylene composition cools 5-80s naturally, carry on the blowing process;
and stretching and blowing, namely longitudinally stretching and transversely blowing the polyethylene composition by using equipment to obtain the formed heat shrinkable film.
8. The process for preparing a heat shrinkable film according to claim 7, wherein the stretching ratio of the stretching and blowing step is 1: 10-40.
9. The method for preparing a heat shrinkable film of claim 7, wherein the inflation process has an inflation ratio of 1: 4-8.
10. The method for preparing the heat shrinkable film of claim 7, wherein the high density polyethylene has a melt index of <0.08g/10min, the linear low density polyethylene has a melt index of <1.0g/10min, and the metallocene polyethylene has a melt index of <1.0g/10 min.
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101929100A (en) * | 2010-07-24 | 2010-12-29 | 广东金明精机股份有限公司 | Stone paper blowing production equipment |
| CN102632611A (en) * | 2012-04-27 | 2012-08-15 | 昊辰（无锡）塑业有限公司 | Solar cell packaging glue film |
| CN104354427A (en) * | 2014-12-01 | 2015-02-18 | 东莞市正新包装制品有限公司 | Five-layer polyethylene repackaging hot shrinkable film and preparation method thereof |
| CN104859948A (en) * | 2015-06-12 | 2015-08-26 | 成都市益诚包装有限公司 | High impact force-resistant polyethylene heat shrink film and film blowing process |
| CN107234802A (en) * | 2016-03-28 | 2017-10-10 | 株式会社吴羽 | The manufacture method of vinylidene chloride resin film and the renovation process for injecting liquid for the manufacture method |
| CN107244121A (en) * | 2017-06-23 | 2017-10-13 | 无锡市方成彩印包装有限公司 | A kind of high strength slim packs heat shrink films and preparation method thereof again |
| CN107498965A (en) * | 2017-07-07 | 2017-12-22 | 河间市精诚塑业有限公司 | A kind of super-thin low-voltage thermoplastic film and its preparation technology |
| US20180304595A1 (en) * | 2015-10-15 | 2018-10-25 | Macro Technology Inc. | Multilayer Plastic Film with Heat Resistant Outer Layers and Slow and Normal Crystallizing Polyamides |
| CN110216960A (en) * | 2019-06-03 | 2019-09-10 | 黄山永新股份有限公司 | A kind of bloom low haze PE heat shrink films and preparation method thereof |
| CN112592532A (en) * | 2020-11-16 | 2021-04-02 | 安徽双鹤药业有限责任公司 | Preparation process of vertical polypropylene infusion bag capable of avoiding shrinkage and cracking |
-
2022
- 2022-03-09 CN CN202210231848.XA patent/CN114603958A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101929100A (en) * | 2010-07-24 | 2010-12-29 | 广东金明精机股份有限公司 | Stone paper blowing production equipment |
| CN102632611A (en) * | 2012-04-27 | 2012-08-15 | 昊辰（无锡）塑业有限公司 | Solar cell packaging glue film |
| CN104354427A (en) * | 2014-12-01 | 2015-02-18 | 东莞市正新包装制品有限公司 | Five-layer polyethylene repackaging hot shrinkable film and preparation method thereof |
| CN104859948A (en) * | 2015-06-12 | 2015-08-26 | 成都市益诚包装有限公司 | High impact force-resistant polyethylene heat shrink film and film blowing process |
| US20180304595A1 (en) * | 2015-10-15 | 2018-10-25 | Macro Technology Inc. | Multilayer Plastic Film with Heat Resistant Outer Layers and Slow and Normal Crystallizing Polyamides |
| CN107234802A (en) * | 2016-03-28 | 2017-10-10 | 株式会社吴羽 | The manufacture method of vinylidene chloride resin film and the renovation process for injecting liquid for the manufacture method |
| CN107244121A (en) * | 2017-06-23 | 2017-10-13 | 无锡市方成彩印包装有限公司 | A kind of high strength slim packs heat shrink films and preparation method thereof again |
| CN107498965A (en) * | 2017-07-07 | 2017-12-22 | 河间市精诚塑业有限公司 | A kind of super-thin low-voltage thermoplastic film and its preparation technology |
| CN110216960A (en) * | 2019-06-03 | 2019-09-10 | 黄山永新股份有限公司 | A kind of bloom low haze PE heat shrink films and preparation method thereof |
| CN112592532A (en) * | 2020-11-16 | 2021-04-02 | 安徽双鹤药业有限责任公司 | Preparation process of vertical polypropylene infusion bag capable of avoiding shrinkage and cracking |
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