CN113524835A - Composite packaging material with metal wire drawing on surface and preparation method thereof - Google Patents
Composite packaging material with metal wire drawing on surface and preparation method thereof Download PDFInfo
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- CN113524835A CN113524835A CN202110641656.1A CN202110641656A CN113524835A CN 113524835 A CN113524835 A CN 113524835A CN 202110641656 A CN202110641656 A CN 202110641656A CN 113524835 A CN113524835 A CN 113524835A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 14
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- 238000003851 corona treatment Methods 0.000 claims description 18
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Images
Classifications
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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
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
- B29C43/24—Calendering
-
- 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
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
-
- 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
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
-
- 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
-
- 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
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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
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/308—Heat stability
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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
- B32B2307/31—Heat sealable
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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
- B32B2307/406—Bright, glossy, shiny surface
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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
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/558—Impact strength, toughness
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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
- B32B2553/00—Packaging equipment or accessories not otherwise provided for
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention provides a surface wire drawing effect composite packaging material and a preparation method thereof, wherein the preparation method comprises a casting film process, a hot pressing process and a dry repeating process, wherein the casting process is to prepare a modified casting polypropylene film by cooling a three-layer co-extrusion casting station of raw materials, and then hot press a casting PP film on a metal wire drawing template to prepare a metal wire drawing effect; and finally, carrying out dry compounding on the cast PP film and the aluminized VMPET film, and then compounding the film and the PE film for two times to finally prepare the composite packaging material with the metal wire drawing effect. The invention realizes the innovative application of metal wire drawing effect on plastic composite packaging materials by using a special functional formula design and a special processing technology and an aluminum film evaporation plating technology. The prepared film material shows excellent stability, heat resistance, impact resistance, pressure resistance and excellent stability of subsequent reprocessing under normal state or high temperature condition.
Description
Technical Field
The invention relates to the field of packaging materials, in particular to a composite packaging material with a metal wire drawing surface and a preparation method thereof.
Background
The packaging industry emphasizes individuation visually, pursues an aesthetic effect, takes language as guidance, and realizes pursuit of beauty according to different beauty of everyone. In order to meet the market demand, the design of appearance package is strengthened while the commodity quality is ensured, so as to attract the eyes of consumers. The appearance design of the package is a design form which is made into the shape, pattern or combination thereof of the product and the combination of color, shape and pattern, is beautiful and suitable for industrial application, has unique self characteristics and strong visual impact and aesthetic feeling through various shapes, patterns and materials, and fully embodies and explains the important function of the appearance package design.
The metal wire drawing is a manufacturing process of repeatedly scraping lines on an aluminum plate by using sand paper, in the wire drawing process, the anode treatment technology enables a leather film layer containing the metal component to be generated on the metal surface, each fine wire mark is clearly displayed, and therefore fine hair luster is generated in the metal matte, so that the metal matte has the advantages of attractiveness and bulkiness, the product has elements of fashion and science and technology, more vivid and vivid aesthetic feeling is brought to people, and the metal wire drawing has high decorative and ornamental values.
According to the traditional production process of plastic flexible packages, the metal wire drawing process cannot realize corresponding innovation and optimization of package appearance through traditional functional master batches or through coating functional coatings (such as extinction, frosting and the like).
Disclosure of Invention
The invention provides a surface wire drawing effect composite packaging material and a preparation method thereof, aiming at solving the technical problem that the metal wire drawing process in the prior art cannot be realized by traditional functional master batches or functional coating.
In order to solve the technical problem, the technical scheme is that the preparation method of the composite packaging material with the surface wire drawing effect comprises the following steps:
s1, weighing raw materials in corresponding parts by mass according to the formula composition of a corona layer, an intermediate layer and a heat sealing layer of the film, respectively adding the raw materials into three charging barrels of a co-extrusion casting device, extruding the raw materials in the charging barrels, then feeding the extruded raw materials into a casting station for cooling and shaping, carrying out corona treatment on the surface of the corona layer of the film subjected to casting shaping, and obtaining a modified cast polypropylene film, namely a modified PP film after the corona treatment;
s2, unreeling the modified PP film through an unreeling unit, passing through a preheating roller at 95-105 ℃ after unreeling, then passing through a compression roller, then carrying out hot pressing with a metal wire drawing template at 135-150 ℃ under the pressing pressure of a laminating roller at 0.7-0.8Mpa, cooling and shaping through a cooling roller after hot pressing, separating the modified PP film from the metal wire drawing template, forming the same stripes as those on the metal wire drawing template on the surface of the modified PP film, and reeling through a reeling unit to obtain the wire drawing modified PP film;
s3, dry-compounding the non-mold-pressed surface of the wire drawing modified PP film and the aluminum-plated surface of the polyester aluminum-plated film, namely the VMPET film, to form a wire drawing modified PP/VMPET composite film, dry-compounding the non-aluminum-plated surface of the VMPET film in the wire drawing modified PP/VMPET composite film and the corona surface of the polyethylene film, namely the PE film, to finally prepare the wire drawing modified PP/VMPET/PE composite film with the metal wire drawing effect.
The preparation method of the composite packaging material as the surface metal wiredrawing is further improved:
preferably, the temperature of the three barrels corresponding to the extruder barrel in the step S1 is 225-235 ℃ in the first section, 230-240 ℃ in the second section, 240-250 ℃ in the third section, and 245 ℃ in the die head.
Preferably, the roll surface temperature of the casting roll in the casting process in the step S1 is 18-25 ℃, and the power of the corona treatment is 30-40Wmin/m2And the pressure of the corona roller is 5-7 bar.
Preferably, the thickness ratio of the corona layer, the intermediate layer and the hot-pressing layer in step S1 is 3:12:5, wherein the thickness of the corona layer is 6-9 μm, the thickness of the intermediate layer is 24-36 μm, and the thickness of the hot-pressing layer is 10-15 μm.
Preferably, the adhesive used in the dry-type lamination in step S2 is a two-component polyurethane adhesive, and the supplier is the peking high union, and the brand is YH 8950.
Preferably, the unreeling tension in the step S2 is 13-15kgf, and the unreeling speed is 40-60 m/min.
Preferably, the corona layer in step S1 is composed of a high-crystalline polypropylene homo-polypropylene resin and a terpolymer polypropylene resin in a mass ratio of 80: 20; the middle layer is made of high-crystalline polypropylene homopolymerized resin; the heat sealing layer is composed of high-crystalline polypropylene homopolymerization resin, ternary polymerization polypropylene resin, a processing aid, smooth master batches and opening master batches according to the mass ratio of (30-40) to (60-70) to (0.1-0.2) to (0.9-1.1).
Preferably, the heat sealing layer is composed of high-crystalline polypropylene homopolymerization resin, ternary polymerization polypropylene resin, a processing aid, smooth master batches and opening master batches according to the mass ratio of 35:65:0.2:1: 1.
Preferably, the high-crystalline polypropylene homopolymerization resin is HD905CF of the Nordic chemical company, the ternary copolymerization polypropylene resin is RC213M of the Liandedsel industry company, the processing aid is 100991-K of the Annuo color company, the smooth master batch is 10090-K of the Annuo color company, and the open master batch is AB20LD of the Beijing Allen company.
In order to solve the technical problem of the invention, another technical scheme is that the composite packaging material with the metal wire drawing on the surface is prepared by any one of the preparation methods.
Compared with the prior art, the invention has the beneficial effects that:
1) the invention applies a special functional formula design, forms a wire drawing effect on a modified cast polypropylene film through hot pressing, and then creatively carries out dry-type compounding on a wire drawing modified PP film, a VMPET film and a PE film to prepare the wire drawing modified PP/VMPET/PE composite film with a metal wire drawing effect. The metal wire drawing effect is realized on the plastic composite packaging material, the characteristics of stable quality, high production precision, convenient operation and the like are shown under the normal state or high temperature condition, the visual impact is added to the outer package of the product, the multiple visual enjoyment is brought, the light and color effect is more obvious, and the plastic composite packaging material is favored by consumers and food daily chemical enterprises.
2) In the formulation design of raw materials, the film material is manufactured by a casting process according to the selection of particles, the design of the formulation and the optimization of the process. The high-crystalline polypropylene homopolymerization resin adopts HD905CF which is produced by northern Europe chemical industry and is based on the technology of North star polymerization nucleation (BNT), and can provide high rigidity, very high heat resistance, impact resistance and glossiness for a film structure; the ternary copolymer polypropylene resin is prepared from RC213M produced by Liandedsel industries, has good fluidity, good molding property, small influence of temperature, high molecular orientation degree, good thermal stability and heat-resistant sealing property, and excellent processability.
The hot-pressing process equipment mainly comprises an unreeling unit, a preheating roller, a mould pressing roller, a laminating roller, a cooling roller and a reeling unit. By setting three factors of temperature, speed and tension in the production of the hot pressing procedure, the metal wire drawing effect is perfectly copied and presented, and the physical and mechanical properties of the film are not changed.
The dry compounding process is to compound the PP film which is hot-pressed and the aluminized VMPET film through dry compounding equipment to form a drawn PP/VMPET composite film, perfectly set off the effect of metal drawing through the metal texture of the aluminized VMPET film, and then compound the drawn PP/VMPET composite film on the inner surface through the dry compounding process to finally form the drawn PP/VMPET/PE structure composite packaging material with the metal drawing effect.
Drawings
FIG. 1 is a flow chart of the preparation of the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to embodiments, and all other embodiments obtained by a person of ordinary skill in the art without any creative effort based on the embodiments of the present invention belong to the protection scope of the present invention.
In the following examples, the high crystalline polypropylene homopolymeric resin is available under the trademark HD905CF from northern Europe chemical Co; the ternary copolymer polypropylene is the trademark RC213M produced by Liandedsel industries; the smooth master batch is 10090-K produced by color and safety companies; the opening master batch is a brand AB20LD produced by Beijing Allen company; the processing aid is a brand 100991-K produced by an color matching company.
Example 1
S1, weighing raw materials according to the formula of a corona layer, a middle layer and a heat sealing layer in the cast polypropylene film, wherein the corona layer is composed of 80 parts by mass of high-crystalline polypropylene homopolymerized resin and 20 parts by mass of ternary copolymer polypropylene resin; the middle layer consists of 100 parts by mass of high-crystalline polypropylene homopolymerized resin; the heat sealing layer consists of 35 parts by mass of high-crystalline polypropylene homopolymerized resin, 65 parts by mass of ternary polymerization polypropylene resin, 0.15 part by mass of processing aid, 1.0 part by mass of smooth master batch and 1.0 part by mass of opening master batch;
s2, respectively adding the raw materials of the corona layer, the middle layer and the heat sealing layer into three charging barrels of a co-extrusion casting device, wherein the temperatures of the three charging barrels of an extruder are 230 ℃ in one section, 240 ℃ in the second section and 245 ℃ in the third section, the temperature of a die head is 240 ℃, the roller surface temperature of a casting roller is set to be 25 ℃ in the casting process, carrying out corona treatment on the cast and shaped film on the corona layer surface, and the corona treatment power is set to be 36Wmin/m2The pressure of a corona compression roller is 6bar, and the modified cast polypropylene film is obtained after corona treatment;
s3, unreeling the modified cast polypropylene film through an unreeling unit, wherein the traction tension is 14kgf, the unreeling speed is 50m/min, preheating the film through a preheating roller at 100 ℃ after unreeling, then carrying out hot pressing on the film through a die pressing roller and a metal wire drawing template at 145 ℃ under the pressing pressure of a laminating roller of 0.8Mpa, cooling and shaping the modified cast polypropylene film through a cooling roller after hot pressing, separating the film from the metal wire drawing template, reeling through a reeling unit, and forming stripes which are the same as those on the metal wire drawing template on the surface of the modified cast polypropylene film to obtain the wire drawing modified cast polypropylene film, namely the wire drawing modified PP film;
s4, dry-compounding the non-mold-pressed surface of the wire drawing modified PP film and the aluminum-plated surface of the polyester aluminum-plated film, namely the VMPET film, to form a wire drawing modified PP/VMPET composite film, and compounding the corona surface of the polyethylene film, namely the PE film, and the PET surface of the VMPET film in the wire drawing modified PP/VMPET composite film through a dry-compounding process, so as to finally prepare the wire drawing modified PP/VMPET/PE composite film with the metal wire drawing effect.
Example 2
S1, weighing raw materials according to the formula of a corona layer, a middle layer and a heat sealing layer in the cast polypropylene film, wherein the corona layer is composed of 80 parts by mass of high-crystalline polypropylene homopolymerized resin and 20 parts by mass of ternary copolymer polypropylene resin; the middle layer consists of 100 parts by mass of high-crystalline polypropylene homopolymerized resin; the heat sealing layer consists of 30 parts by mass of high-crystalline polypropylene homopolymerized resin, 70 parts by mass of ternary polymerization polypropylene resin, 0.1 part by mass of processing aid, 0.9 part by mass of smooth master batch and 0.9 part by mass of opening master batch;
s2, respectively adding the raw materials of the corona layer, the middle layer and the heat sealing layer into three charging barrels of a co-extrusion casting device, wherein the temperatures of the three charging barrels of an extruder are 230 ℃ in one section, 240 ℃ in the second section and 245 ℃ in the third section, the temperature of a die head is 240 ℃, the roller surface temperature of a casting roller is set to be 25 ℃ in the casting process, carrying out corona treatment on the cast and shaped film on the corona layer surface, and the corona treatment power is set to be 36Wmin/m2The pressure of a corona compression roller is 6bar, and the modified cast polypropylene film is obtained after corona treatment;
s3, unreeling the modified cast polypropylene film through an unreeling unit, wherein the traction tension is 14kgf, the unreeling speed is 50m/min, preheating the film through a preheating roller at 100 ℃ after unreeling, then carrying out hot pressing on the film through a die pressing roller and a metal wire drawing template at 145 ℃ under the pressing pressure of a laminating roller of 0.8Mpa, cooling and shaping the modified cast polypropylene film through a cooling roller after hot pressing, separating the film from the metal wire drawing template, reeling through a reeling unit, and forming stripes which are the same as those on the metal wire drawing template on the surface of the modified cast polypropylene film to obtain the wire drawing modified cast polypropylene film, namely the wire drawing modified PP film;
s4, dry-compounding the non-mold-pressed surface of the wire drawing modified PP film and the aluminum-plated surface of the polyester aluminum-plated film, namely the VMPET film, to form a wire drawing modified PP/VMPET composite film, and compounding the corona surface of the polyethylene film, namely the PE film, and the PET surface of the VMPET film in the wire drawing modified PP/VMPET composite film through a dry-compounding process, so as to finally prepare the wire drawing modified PP/VMPET/PE composite film with the metal wire drawing effect.
Example 3
S1, weighing raw materials according to the formula of a corona layer, a middle layer and a heat sealing layer in the cast polypropylene film, wherein the corona layer is composed of 80 parts by mass of high-crystalline polypropylene homopolymerized resin and 20 parts by mass of ternary copolymer polypropylene resin; the middle layer consists of 100 parts by mass of high-crystalline polypropylene homopolymerized resin; the heat sealing layer consists of 40 parts by mass of high-crystalline polypropylene homopolymerized resin, 60 parts by mass of ternary polymerization polypropylene resin, 0.2 part by mass of processing aid, 1.1 part by mass of smooth master batch and 1.1 part by mass of opening master batch;
s2, respectively adding the raw materials of the corona layer, the middle layer and the heat sealing layer into three charging barrels of a co-extrusion casting device, wherein the temperatures of the three charging barrels of an extruder are 230 ℃ in one section, 240 ℃ in the second section and 245 ℃ in the third section, the temperature of a die head is 240 ℃, the roller surface temperature of a casting roller is set to be 25 ℃ in the casting process, carrying out corona treatment on the cast and shaped film on the corona layer surface, and the corona treatment power is set to be 36Wmin/m2The pressure of a corona compression roller is 6bar, and the modified cast polypropylene film is obtained after corona treatment;
s3, unreeling the modified cast polypropylene film through an unreeling unit, wherein the traction tension is 14kgf, the unreeling speed is 50m/min, preheating the film through a preheating roller at 100 ℃ after unreeling, then carrying out hot pressing on the film through a die pressing roller and a metal wire drawing template at 145 ℃ under the pressing pressure of a laminating roller of 0.8Mpa, cooling and shaping the modified cast polypropylene film through a cooling roller after hot pressing, separating the film from the metal wire drawing template, reeling through a reeling unit, and forming stripes which are the same as those on the metal wire drawing template on the surface of the modified cast polypropylene film to obtain the wire drawing modified cast polypropylene film, namely the wire drawing modified PP film;
s4, dry-compounding the non-mold-pressed surface of the wire drawing modified PP film and the aluminum-plated surface of the polyester aluminum-plated film, namely the VMPET film, to form a wire drawing modified PP/VMPET composite film, and compounding the corona surface of the polyethylene film, namely the PE film, and the PET surface of the VMPET film in the wire drawing modified PP/VMPET composite film through a dry-compounding process, so as to finally prepare the wire drawing modified PP/VMPET/PE composite film with the metal wire drawing effect.
Comparative example 1
S1, weighing raw materials according to the formula of a corona layer, a middle layer and a heat sealing layer in the cast polypropylene film, wherein the corona layer is composed of 80 parts by mass of high-crystalline polypropylene homopolymerized resin and 20 parts by mass of ternary copolymer polypropylene resin; the middle layer consists of 100 parts by mass of high-crystalline polypropylene homopolymerized resin; the heat sealing layer consists of 35 parts by mass of high-crystalline polypropylene homopolymerized resin, 65 parts by mass of ternary polymerization polypropylene resin, 0.15 part by mass of processing aid, 1.0 part by mass of smooth master batch and 1.0 part by mass of opening master batch;
s2, respectively adding the raw materials of the corona layer, the middle layer and the heat sealing layer into three charging barrels of a co-extrusion casting device, wherein the temperatures of the three charging barrels of an extruder are 230 ℃ in one section, 240 ℃ in the second section and 245 ℃ in the third section, the temperature of a die head is 240 ℃, the roller surface temperature of a casting roller is set to be 25 ℃ in the casting process, carrying out corona treatment on the cast and shaped film on the corona layer surface, and the corona treatment power is set to be 36Wmin/m2The pressure of a corona compression roller is 6bar, and the modified cast polypropylene film is obtained after corona treatment;
s3, dry-compounding the non-molding surface of the modified cast polypropylene film and the aluminum-plated surface of the polyester aluminum-plated film, namely the VMPET film, to form a modified PP/VMPET composite film, and then compounding the corona surface of the polyethylene film, namely the PE film, and the PET surface of the VMPET film in the modified PP/VMPET composite film through a dry-compounding process, so as to finally prepare the modified PP/VMPET/PE composite film.
The composite films prepared in examples 1 to 3 and comparative example 1 were subjected to performance tests, and the results are shown in table 1 below:
TABLE 1 results of Performance test of examples 1-3 and comparative example 1
As can be seen from the test results of table 1: the surface roughness and the Us static friction coefficient of the wire-drawing modified PP/VMPET/PE composite film prepared by the preparation process are far greater than those of the existing common packaging material produced by the same material and process, so that the wire-drawing modified PP/VMPET/PE composite film has an excellent metal wire-drawing performance effect, adds visual impact to the outer package of a product, brings multiple visual enjoyment and has a more obvious color effect; the tensile strength, elongation at break, peeling force, friction coefficient, heat seal strength, water vapor permeability and oxygen permeability of the composite membrane are equivalent to those of comparative example 1, and the composite membrane prepared by the process has excellent mechanical property and air permeability. As can be seen from the comparison of the performances of the products in examples 1 to 3, the product prepared by the process has the characteristics of stable performance and small deviation, and is convenient to apply to industrial production.
It should be understood by those skilled in the art that the foregoing is only illustrative of several embodiments of the invention, and not of all embodiments. It should be noted that many variations and modifications are possible to those skilled in the art, and all variations and modifications that do not depart from the gist of the invention are intended to be within the scope of the invention as defined in the appended claims.
Claims (10)
1. The preparation method of the composite packaging material with the metal wire drawing on the surface is characterized by comprising the following steps:
s1, weighing raw materials in corresponding parts by mass according to the formula composition of the corona layer, the middle layer and the heat sealing layer of the film, respectively adding the raw materials into three charging barrels of a co-extrusion casting device, extruding the raw materials in the charging barrels, cooling and shaping the raw materials in a casting process, carrying out corona treatment on the surface of the corona layer of the film subjected to casting shaping, and obtaining a modified casting polypropylene film, namely a modified PP film after the corona treatment;
s2, unreeling the modified PP film through an unreeling unit, passing through a preheating roller at 95-105 ℃ after unreeling, then passing through a compression roller, then carrying out hot pressing with a metal wire drawing template at 135-150 ℃ under the pressing pressure of a laminating roller at 0.7-0.8Mpa, cooling and shaping through a cooling roller after hot pressing, separating the modified PP film from the metal wire drawing template, forming the same stripes as those on the metal wire drawing template on the surface of the modified PP film, and reeling through a reeling unit to obtain the wire drawing modified PP film;
s3, dry-compounding the non-mold-pressed surface of the wire drawing modified PP film and the aluminum-plated surface of the polyester aluminum-plated film, namely the VMPET film, to form a wire drawing modified PP/VMPET composite film, dry-compounding the non-aluminum-plated surface of the VMPET film in the wire drawing modified PP/VMPET composite film and the corona surface of the polyethylene film, namely the PE film, to finally prepare the wire drawing modified PP/VMPET/PE composite film with the metal wire drawing effect.
2. The method as claimed in claim 1, wherein the three barrels of the step S1 correspond to extruder barrels with a temperature of 225 ℃ in one section, 235 ℃ in the second section, 230 ℃ in the second section, 250 ℃ in the third section and a die temperature of 240 ℃ in the third section, 245 ℃.
3. The method for preparing a surface metal wiredrawing composite packaging material according to claim 1, wherein the casting roll surface temperature in the casting process of the step S1 is 18-25 ℃, and the power of the corona treatment is 30-40Wmin/m2And the pressure of the corona roller is 5-7 bar.
4. The method for preparing a surface metal wiredrawn composite packaging material according to claim 1, wherein the ratio of the thicknesses of the corona layer, the intermediate layer and the hot-pressed layer in step S1 is 3:12:5, wherein the thickness of the corona layer is 6-9 μm, the thickness of the intermediate layer is 24-36 μm, and the thickness of the hot-pressed layer is 10-15 μm.
5. The method for preparing a composite packaging material with metal wire drawing on the surface according to claim 1, wherein the adhesive used in the dry-type compounding in step S2 is a two-component polyurethane adhesive, and the supplier is the heijing heisui under the designation YH 8950.
6. The method for preparing the composite packaging material for surface metal wiredrawing according to claim 1, wherein the unreeling in the step S2 has a pulling tension of 13 to 15kgf and an unreeling speed of 40 to 60 m/min.
7. The method for preparing a surface metal wiredrawn composite packaging material according to claim 1 or 4, wherein the corona layer in step S1 is composed of a high crystalline polypropylene homo-polypropylene resin and a terpolymer polypropylene resin in a mass ratio of 80: 20; the middle layer is made of high-crystalline polypropylene homopolymerized resin; the heat sealing layer is composed of high-crystalline polypropylene homopolymerization resin, ternary polymerization polypropylene resin, a processing aid, smooth master batches and opening master batches according to the mass ratio of (30-40) to (60-70) to (0.1-0.2) to (0.9-1.1).
8. The preparation method of the surface metal wiredrawing composite packaging material according to claim 7, wherein the heat sealing layer is composed of high-crystalline polypropylene homopolymerization resin, ternary copolymerization polypropylene resin, processing aid, smooth master batch and opening master batch according to a mass ratio of 35:65:0.2:1: 1.
9. The preparation method of the surface metal wiredrawing composite packaging material according to claim 7 or 8, wherein the high-crystalline polypropylene homopolymer resin is HD905CF of Nordic chemical company, the ternary copolymer polypropylene resin is RC213M of Liandedsel industry company, the processing aid is 100991-K of Anomao color company, the smooth master batch is 10090-K of Anomao color company, and the open master batch is AB20LD of Beijing Allen company.
10. A surface metal-wiredrawn composite packaging material produced by the production method according to any one of claims 1 to 9.
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| CN113502018A (en) * | 2021-07-23 | 2021-10-15 | 浙江工业大学 | Preparation method of composite film for polypropylene packaging |
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| CN109367175A (en) * | 2018-10-10 | 2019-02-22 | 重庆科欣塑料有限公司 | A kind of wire drawing film composite material and packaging material and packaging product comprising it |
| CN208746667U (en) * | 2018-08-30 | 2019-04-16 | 杭州顶正包材有限公司 | Imitative metal wire-drawing composite membrane and its packaging |
| CN112026315A (en) * | 2020-07-14 | 2020-12-04 | 黄山永新股份有限公司 | Cast polypropylene peelable release film and preparation method thereof |
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| CN208746667U (en) * | 2018-08-30 | 2019-04-16 | 杭州顶正包材有限公司 | Imitative metal wire-drawing composite membrane and its packaging |
| CN109367175A (en) * | 2018-10-10 | 2019-02-22 | 重庆科欣塑料有限公司 | A kind of wire drawing film composite material and packaging material and packaging product comprising it |
| CN112026315A (en) * | 2020-07-14 | 2020-12-04 | 黄山永新股份有限公司 | Cast polypropylene peelable release film and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113502018A (en) * | 2021-07-23 | 2021-10-15 | 浙江工业大学 | Preparation method of composite film for polypropylene packaging |
| CN113502018B (en) * | 2021-07-23 | 2022-12-09 | 浙江工业大学 | Preparation method of composite film for polypropylene packaging |
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Application publication date: 20211022 |