CN110065270B - High-sealing-performance multi-channel packaging composite film and production process thereof - Google Patents
High-sealing-performance multi-channel packaging composite film and production process thereof Download PDFInfo
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- CN110065270B CN110065270B CN201910380197.9A CN201910380197A CN110065270B CN 110065270 B CN110065270 B CN 110065270B CN 201910380197 A CN201910380197 A CN 201910380197A CN 110065270 B CN110065270 B CN 110065270B
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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
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal 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
- B32B15/085—Layered products comprising a layer of metal comprising metal 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 comprising polyolefins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal 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
- B32B15/09—Layered products comprising a layer of metal comprising metal 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 comprising polyesters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/40—Applications of laminates for particular packaging purposes
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Abstract
The invention relates to a high-sealing multi-channel packaging composite film and a production process thereof. The composite film is formed by compounding a PET film, an aluminum foil film and a three-layer co-extruded PE film through an adhesive; the three-layer co-extrusion PE film comprises a corona layer, a middle layer and a heat sealing layer, wherein the corona layer comprises linear low-density polyethylene, low-density polyethylene and fluorine-containing processing aids, the middle layer comprises low-density polyethylene, linear low-density polyethylene and high-density polyethylene, the heat sealing layer comprises first metallocene linear low-density polyethylene, second metallocene linear low-density polyethylene, polybutylene, a slipping agent and an opening master batch, and the first metallocene linear low-density polyethylene is lower in melt index than the second metallocene linear low-density polyethylene. The composite film has excellent thickness stability, the friction coefficient is 0.2-0.3, and the composite film is beneficial to moving; the heat sealing strength and the hot adhesion strength are high, the negative pressure resistance is not less than 0.8MPa, and the sealing performance is excellent; the Elmendorf has low tearing force, and the film is easy to cut and does not generate silks.
Description
Technical Field
The invention belongs to the field of film packaging materials, and particularly relates to a high-sealing multi-channel packaging composite film and a production process thereof.
Background
At present, food and medicine packing are more and more giving the packaging efficiency, and the processing equipment inefficiency of single passageway, extravagant serious is replaced gradually by multichannel equipment, and multichannel equipment is the equipment that is equipped with a plurality of discharge gates side by side when moving, and the cutter is separated and is formed a plurality of ways and leads to, and the corresponding book membrane is just cut into a plurality of pages of a whole that can function simultaneously by the cutter to realize a plurality of wrapping bags of disposable processing. With the development of the trend, the market demand for the multi-channel roll film is larger and larger, and the quality requirement of the multi-channel roll film is higher and higher. But the multichannel roll film has the characteristics of large width, high requirement on equipment matching, strict sealing performance and the like, and brings great challenges to the flexible packaging industry. In general, the multi-channel rolled film has poor film uniformity; the film is easy to deviate when moving; poor sealing performance and high air leakage rate; the heat sealing and hot sticking strength is low, and the negative pressure resistance is poor; the defects of poor longitudinal and transverse tearing force of the film, difficulty in cutting the film, more burrs at the edge and the like seriously affect the production efficiency of downstream enterprises.
Disclosure of Invention
In order to solve the technical problems, the invention provides a high-tightness multi-channel packaging composite film and a production process thereof.
In order to realize the purpose of the invention, the invention adopts the following technical scheme:
a high-sealing-performance multi-channel packaging composite film comprises a PET film, an aluminum foil film and a three-layer co-extrusion PE film, wherein the PET film, the aluminum foil film and the three-layer co-extrusion PE film are compounded through an adhesive to form the composite film; the three-layer co-extrusion PE film comprises a corona layer, a middle layer and a heat sealing layer, wherein the corona layer comprises the following components in percentage by mass (59-60): (33-34): (6-7) linear low density polyethylene, low density polyethylene and fluorine-containing processing aid, the intermediate layer comprises the following components in percentage by mass (49-51): (24-26): (24-26) low density polyethylene, linear low density polyethylene and high density polyethylene, the heat sealing layer comprises the following components in percentage by mass (53-54): (32-34): (9-11): (1-2): (1-2) the first metallocene linear low density polyethylene, the second metallocene linear low density polyethylene, polybutene, a slip agent and an open-ended master batch, the first metallocene linear low density polyethylene melt refers to a smaller than second metallocene linear low density polyethylene.
The further technical scheme is as follows: the thickness of the corona layer is 14 +/-1 microns, the thickness of the middle layer is 26 +/-1 microns, the thickness of the heat sealing layer is 20 +/-1 microns, and the total thickness of the three-layer co-extrusion PE film is 60 +/-2 microns.
The further technical scheme is as follows: the linear low density polyethylene mark in the corona layer is as follows: a raisin 7042; the corona layer is characterized in that the low-density polyethylene mark: exxon 150 BW; the corona layer contains fluorine-containing processing aid brands: 100991-K;
the middle layer is made of low-density polyethylene with the following grades: yangbuck 2420H; the linear low density polyethylene mark in the middle layer is as follows: a raisin 7042; the middle layer is made of medium-high density polyethylene with the mark number: HD 3355F;
the first metallocene linear low density polyethylene in the heat-seal layer has the following mark: SP 2020; the second metallocene linear low density polyethylene in the heat-seal layer has the following mark: SP 0540; and polybutylene marks in the heat sealing layer are as follows: PB 0110; the grade of the slipping agent in the heat sealing layer is as follows: ESQ-4; the opening master batch mark in the heat sealing layer is as follows: AB-20 LD.
The further technical scheme is as follows: the adhesive comprises a first glue, a second glue and ethyl ester according to the mass ratio of (19.5-20.5) to (1.5-2.5) to (29.5-30.5); the first grade of the glue is as follows: high alliance AD919A, the glue brand two: high alliance AD 919B; the composite gluing amount between the PET film and the aluminum foil film is 3.0-3.5g/m2The composite gluing amount between the aluminum foil film and the three-layer co-extrusion PE film is 2.6-3.0g/m2。
A production process of the high-tightness multi-channel packaging composite film comprises the following steps:
step 1, preparing a three-layer co-extruded PE film: adding materials in the corona layer, the middle layer and the heat sealing layer into a three-layer co-extrusion film blowing machine according to the formula requirements, plasticizing the materials into a melt through a corresponding machine barrel, and filtering impurities to reach a die head through a filter when the melt is extruded; then, carrying out film blowing, air cooling and shaping, clamping and bubble quenching, traction cooling, corona and winding treatment to obtain the three-layer co-extruded PE film;
the filter comprises four layers of filter screens, and the specifications of the filter screens are 20 meshes, 150 meshes and 20 meshes in sequence along the melt flow direction; the extrusion capacity of the three-layer co-extrusion film blowing machine is 1272 +/-50 kg/h; the temperature of the internal cooling air inlet is 21-31 ℃ and the temperature of the external cooling air inlet is 13-23 ℃ in the air cooling shaping treatment process; the winding adopts a central surface winding mode, and the winding tension is controlled to be 45-65N;
step 2, compounding: the PET film is subjected to printing treatment and then is compounded with the aluminum foil film through an adhesive for one time to obtain a compound film; then carrying out secondary compounding on the composite film and the three-layer co-extruded PE film through an adhesive to obtain the packaging composite film; the winding tension is gradually reduced in a linear proportion according to the gradual increase of the winding diameter during compounding.
The invention has the beneficial effects that:
(1) three-layer co-extruded PE film
The linear low density polyethylene (LLDPE, melt index 2.0g/10min, density 0.920g/cm3) which is used in the corona layer and produced by petrochemical production and is of the trademark of Yangzi 7042 has the characteristics of excellent physical and mechanical properties, easiness in corona, lower cost and the like. The low density polyethylene (LDPE, melt index 0.75g/10min, density 0.923g/cm3) produced by Exxon and having the mark of 150BW has the characteristics of low crystal point, high toughness and the like. The fluorine processing aid with the trade name of 100991-K produced by the color matching improves the fluidity of molten resin, so that the film is smooth and transparent after being formed.
The main material of the middle layer is linear low-density polyethylene which is consistent with the heat-sealing layer of Yangzi 7042, and the mechanical property of the middle layer is kept. Meanwhile, low-density polyethylene (LDPE, melt index is 2g/10min, and density is 0.923g/cm3) which is produced by Yangzoba Schiff and has the brand name of Yangzoba 2420H is used, and the particles have excellent fluidity, can be well blended with LLDPE and provide good film stability for the LLDPE. High density polyethylene (HDPE, melt index 1.1g/10min, density 0.951g/cm3) with the trademark of HD3355F produced by Thai petrochemical is additionally added, and the particle has high melt index and excellent size stability, impact resistance and stiffness. After the three resins are mixed, the film after casting has better stiffness and suitable softness, and the longitudinal and transverse easy tearing performance is improved.
The heat-sealing layer uses the first metallocene linear low-density polyethylene (mLLDPE, melt finger 2.3g/10min, density 0.916g/cm3) which is produced by Mitsui Japan and has the brand number SP2020, the particles not only have better longitudinal and transverse tearability, but also have better heat-sealing performance, and the film can have good sealing performance and can provide stable friction coefficient for the film. Second metallocene linear low density polyethylene (mLLDPE, melt index 3.8g/10min, density 0.916g/cm3) manufactured by Mitsui Japan, brand SP0540, has a high hot tack strength and an excellent heat seal strength, which facilitates to improve the processing speed of a multi-pass facility while securing the sealability. Meanwhile, polybutylene with the trade name of PB0110 (the melt index is 12.0g/10min, the density is 0.903g/cm3) is added and uniformly dispersed in the heat sealing layer, the polybutylene has slow crystallization kinetics so that the polybutylene has excellent wettability, and the polybutylene has high sensitive shear fluidity so that the polybutylene can be easily dispersed in a polymer to form a uniform two-phase structure, so that the acting force between original polyethylene molecules is destroyed, the molecules are reoriented and arranged, and the tearability of the polyethylene film can be obviously improved. The opening master batch with the trade mark AB-20LD produced by the Asian corporation reduces the surface friction coefficient of the film, so that the film has good opening performance. The slipping agent which is produced by the Mitsui Japan and is of the ESQ-4 brand can be effectively matched with the first metallocene linear low-density polyethylene to stably reduce the surface friction coefficient, so that the film running is smooth.
(2) About the production process
In the step 1:
the filter screen of the filter is 20/20/150/20 meshes, and the filter can prevent the film from generating crystal points;
meanwhile, the extrusion amount is controlled to be moderate, the extrusion amount is 1222-1322kg/h, because the excessively high extrusion amount can reduce the cooling effect and prevent wrinkling, but also can increase the probability of crystal points and poor plasticizing points, and the excessively low extrusion amount is very unfavorable for adjusting the bubble type, namely unfavorable for the thick film uniformity of the thin film;
because of the high proportion of high density polyethylene in the three-layer co-extrusion PE film formula, the adjustment of the bubble type is very important in the production process, the temperature control of the external cold air is as small as possible, the temperature of the internal cold air is 21-31 ℃, the temperature of the external cold air is 13-23 ℃, so as to reduce the cooling effect of the film bubble;
the winding must adopt the winding mode of the central surface, and adopt the low-pressure winding, the winding tension of the invention is controlled to be 45-65N, in order to avoid the film from sticking seriously because of the overlarge winding tension of the film roll;
the thickness control system of the three-layer co-extrusion film blowing machine needs to be maintained and checked before the three-layer co-extrusion PE film formula is produced, the accuracy of the system is guaranteed, the thickness deviation of the film is controlled to be +/-2 mu m, meanwhile, the die head and the spiral body are cleaned before production, paraffin or methyl silicone oil can be used for smearing during cleaning, then the paste is lightly wiped by 1000-mesh abrasive paper until the paste is clean, and the stability of the gap of the die head is guaranteed.
In the step 2:
the winding tension is gradually decreased in a linear taper decreasing mode, and according to the principle of moment balance, the winding tension is gradually decreased in an inverse ratio mode along with the continuous increase of the diameter of the film roll; the taper value is set to be decreased linearly, so that the flatness and thickness stability of the composite film can be maintained in an auxiliary manner;
the adhesive is prepared according to the ratio, so that the adhesive has excellent leveling property and bonding property, and has good affinity with an aluminum foil film, so that stable thickness uniformity and excellent physical and mechanical properties, mainly heat sealing and tearing force, can be provided for a composite film.
(3) According to the invention, the formula of the three-layer co-extrusion PE film is designed (including raw material selection and proportion), and the preparation process and the composite process of the three-layer co-extrusion PE film are improved, so that the packaging composite film has excellent performance. The packaging composite film has excellent thickness stability, and the thickness deviation of the composite film is controlled to be +/-5%; the friction coefficient is stably controlled to be 0.2-0.3, the optimal requirement of common packaging equipment on the friction coefficient is met, and the defects of instability and low processing speed of the common multi-channel roll film in the on-machine use are overcome; meanwhile, the composite film has the characteristics of high heat sealing strength and high thermal adhesion strength, the heat sealing strength is not less than 50MPa, and the thermal adhesion strength is not less than 15N/25.4mm, so that excellent sealing performance after packaging and forming is ensured, the negative pressure resistance detection can reach 0.8MPa, and the air leakage rate of packaging is effectively reduced; in addition, the speed of the packaging equipment is accelerated, and the packaging efficiency is improved by 30 percent generally; the multi-channel film rolling machine is mainly used for rolling films with 6-10 rows, the number of lower edges of a cutter is large, the films are easy to generate phenomena of continuous cutting, edge burrs and the like, the packaging efficiency and the foreign matter safety risk that packaging scraps enter food are influenced, the composite film has excellent longitudinal and transverse tearing force, the films are easy to cut, the end openings are smooth and cannot be threaded, and the risks can be avoided.
Drawings
FIG. 1 is a schematic diagram of a structure of a composite membrane layer according to the present invention.
FIG. 2 is a flow chart of the production process of the present invention.
The designations in the drawings have the following meanings:
1-three-layer co-extrusion PE film, 2-aluminum foil film, 3-PET film, 31-printing layer and 4-adhesive layer.
Detailed Description
The technical scheme of the invention is more specifically explained by combining the following embodiments:
the preparation process of the three-layer co-extrusion PE film is shown in the following table 1:
TABLE 1
The composite process of the composite membrane of the invention is shown in the following table 2:
TABLE 2
The following are specific production examples of the composite film according to the invention:
example 1
Step 1, preparing a three-layer co-extruded PE film: adding materials in the corona layer, the middle layer and the heat sealing layer into a three-layer co-extrusion film blowing machine according to the following formula requirements, plasticizing the materials into a melt through a corresponding machine barrel, and filtering impurities to reach a die head through a filter when the melt is extruded; then, the three-layer co-extrusion PE film is obtained through film blowing, air cooling and shaping, clamping and bubble absorption, traction cooling, corona and winding treatment, and the preparation process is shown in Table 1;
the corona layer comprises linear low-density polyethylene, low-density polyethylene and fluorine-containing processing aids in a mass ratio of 59.8:33.3:6.9, the middle layer comprises low-density polyethylene, linear low-density polyethylene and high-density polyethylene in a mass ratio of 50:25:25, and the heat sealing layer comprises first metallocene linear low-density polyethylene, second metallocene linear low-density polyethylene, polybutene, a slipping agent and an opening master batch in a mass ratio of 53.9:33:10:1.5: 1.6;
the filter comprises four layers of filter screens, and the specifications of the filter screens are 20 meshes, 150 meshes and 20 meshes in sequence along the melt flow direction; the extrusion capacity of the three-layer co-extrusion film blowing machine is 1272 kg/h; the temperature of the internal cold air inlet is 26 ℃ and the temperature of the external cold air inlet is 18 ℃ in the air cooling and shaping treatment process; the winding adopts a central surface winding mode, and the winding tension is controlled to be 55N;
step 2, compounding: the PET film (thickness 12 microns) was printedAfter treatment, the aluminum foil film (with the thickness of 7 microns) is compounded with the aluminum foil film (with the thickness of 7 microns) for one time through an adhesive to obtain a compound film, and the one-time compounding gluing amount is 3.3g/m2(ii) a Then the first composite film and the three-layer co-extruded PE film are subjected to secondary compounding through an adhesive to obtain the packaging composite film, wherein the secondary compounding gluing amount is 2.8g/m2(ii) a The winding tension is gradually reduced in a linear proportion according to the gradual increase of the winding diameter during compounding, the winding tension is gradually reduced in a linear proportion from 280N to 80N during primary compounding, and the winding tension is gradually reduced in a linear proportion from 180N to 80N during secondary compounding.
Example 2
Step 1, preparing a three-layer co-extruded PE film: adding materials in the corona layer, the middle layer and the heat sealing layer into a three-layer co-extrusion film blowing machine according to the following formula requirements, plasticizing the materials into a melt through a corresponding machine barrel, and filtering impurities to reach a die head through a filter when the melt is extruded; then, carrying out film blowing, air cooling and shaping, clamping and bubble quenching, traction cooling, corona and winding treatment to obtain the three-layer co-extruded PE film;
the corona layer comprises 59:33:6 linear low-density polyethylene, low-density polyethylene and fluorine-containing processing aid, the middle layer comprises 49:24:24 low-density polyethylene, linear low-density polyethylene and high-density polyethylene, the heat-sealing layer comprises 53:32:9:1 first metallocene linear low-density polyethylene, second metallocene linear low-density polyethylene, polybutylene, slipping agent and opening master batch,
the filter comprises four layers of filter screens, and the specifications of the filter screens are 20 meshes, 150 meshes and 20 meshes in sequence along the melt flow direction; the extrusion capacity of the three-layer co-extrusion film blowing machine is 1222 kg/h; the temperature of the internal cooling air inlet is 21 ℃ and the temperature of the external cooling air inlet is 13 ℃ in the air cooling shaping treatment process; the winding adopts a central surface winding mode, and the winding tension is controlled to be 45N;
step 2, compounding: the PET film (with the thickness of 12 microns) is subjected to printing treatment and then is compounded with the aluminum foil film (with the thickness of 7 microns) through an adhesive at one time to obtain a compound film, and the one-time compound gluing amount is 3.0g/m2(ii) a Then the composite film and the three-layer co-extruded PE film are adhered by glueThe agent is compounded for the second time to obtain the packaging composite film, and the secondary compound gluing amount is 2.6g/m2(ii) a The winding tension is gradually reduced in a linear proportion according to the gradual increase of the winding diameter during compounding, the winding tension is gradually reduced in a linear proportion from 280N to 80N during primary compounding, and the winding tension is gradually reduced in a linear proportion from 180N to 80N during secondary compounding.
Example 3
Step 1, preparing a three-layer co-extruded PE film: adding materials in the corona layer, the middle layer and the heat sealing layer into a three-layer co-extrusion film blowing machine according to the following formula requirements, plasticizing the materials into a melt through a corresponding machine barrel, and filtering impurities to reach a die head through a filter when the melt is extruded; then, carrying out film blowing, air cooling and shaping, clamping and bubble quenching, traction cooling, corona and winding treatment to obtain the three-layer co-extruded PE film;
the corona layer comprises linear low-density polyethylene, low-density polyethylene and fluorine-containing processing aid in a mass ratio of 60:34:7, the middle layer comprises low-density polyethylene, linear low-density polyethylene and high-density polyethylene in a mass ratio of 51:26:26, the heat sealing layer comprises first metallocene linear low-density polyethylene, second metallocene linear low-density polyethylene, polybutylene, a slipping agent and an opening master batch in a mass ratio of 54:34:11:2:2,
the filter comprises four layers of filter screens, and the specifications of the filter screens are 20 meshes, 150 meshes and 20 meshes in sequence along the melt flow direction; the extrusion capacity of the three-layer co-extrusion film blowing machine is 1322 kg/h; the temperature of the inner cold air inlet is 31 ℃ and the temperature of the outer cold air inlet is 23 ℃ in the air cooling and shaping treatment process; the winding adopts a central surface winding mode, and the winding tension is controlled to be 65N;
step 2, compounding: the PET film (with the thickness of 12 microns) is subjected to printing treatment and then is compounded with the aluminum foil film (with the thickness of 7 microns) through an adhesive at one time to obtain a compound film, and the one-time compound gluing amount is 3.5g/m2(ii) a Then the first composite film and the three-layer co-extruded PE film are subjected to secondary compounding through an adhesive to obtain the packaging composite film, wherein the secondary compounding gluing amount is 3.0g/m2(ii) a The winding tension is gradually reduced in linear proportion according to the gradual increase of the winding diameter during compounding, and the winding tension is gradually reduced in one-time compoundingThe rolling tension is gradually reduced from 280N to 80N in a linear proportion, and the rolling tension is gradually reduced from 180N to 80N in a linear proportion during secondary compounding.
The performance comparison between the composite film prepared in the above embodiment and the common multi-channel roll film is shown in the following table 3:
TABLE 3
Claims (4)
1. A high leakproofness multichannel packaging complex film which characterized in that: the film layers of the composite film are a PET film, an aluminum foil film and a three-layer co-extrusion PE film in sequence, wherein the PET film, the aluminum foil film and the three-layer co-extrusion PE film are compounded through an adhesive to form the composite film; the three-layer co-extrusion PE film comprises a corona layer, a middle layer and a heat sealing layer, wherein the corona layer comprises the following components in percentage by mass (59-60): (33-34): (6-7) linear low density polyethylene, low density polyethylene and fluorine-containing processing aid, the intermediate layer comprises the following components in percentage by mass (49-51): (24-26): (24-26) low density polyethylene, linear low density polyethylene and high density polyethylene, the heat sealing layer comprises the following components in percentage by mass (53-54): (32-34): (9-11): (1-2): (1-2) the first metallocene linear low density polyethylene, the second metallocene linear low density polyethylene, polybutene, a slip agent and an open-ended master batch, the first metallocene linear low density polyethylene melt index is less than the second metallocene linear low density polyethylene;
the linear low density polyethylene mark in the corona layer is as follows: a raisin 7042; the corona layer is characterized in that the low-density polyethylene mark: exxon 150 BW; the corona layer contains fluorine-containing processing aid brands: 100991-K;
the middle layer is made of low-density polyethylene with the following grades: yangbuck 2420H; the linear low density polyethylene mark in the middle layer is as follows: a raisin 7042; the middle layer is made of medium-high density polyethylene with the mark number: HD 3355F;
the first metallocene linear low density polyethylene in the heat-seal layer has the following mark: SP 2020; the second metallocene linear low density polyethylene in the heat-seal layer has the following mark: SP 0540; and polybutylene marks in the heat sealing layer are as follows: PB 0110; the grade of the slipping agent in the heat sealing layer is as follows: ESQ-4; the opening master batch mark in the heat sealing layer is as follows: AB-20 LD.
2. The high sealability multi-channel packaging composite film of claim 1 wherein: the thickness of the corona layer is 14 +/-1 microns, the thickness of the middle layer is 26 +/-1 microns, the thickness of the heat sealing layer is 20 +/-1 microns, and the total thickness of the three-layer co-extrusion PE film is 60 +/-2 microns.
3. The high sealability multi-channel packaging composite film of claim 1 wherein: the adhesive comprises a first glue, a second glue and ethyl ester according to the mass ratio of (19.5-20.5) to (1.5-2.5) to (29.5-30.5); the first grade of the glue is as follows: high alliance AD919A, the glue brand two: high alliance AD 919B; the composite gluing amount between the PET film and the aluminum foil film is 3.0-3.5g/m2The composite gluing amount between the aluminum foil film and the three-layer co-extrusion PE film is 2.6-3.0g/m2。
4. A process for producing a high sealability multi-channel packaging composite film according to any of claims 1-3 characterized by the steps of:
step 1, preparing a three-layer co-extruded PE film: adding materials in the corona layer, the middle layer and the heat sealing layer into a three-layer co-extrusion film blowing machine according to the formula requirements, plasticizing the materials into a melt through a corresponding machine barrel, and filtering impurities to reach a die head through a filter when the melt is extruded; then, carrying out film blowing, air cooling and shaping, clamping and bubble quenching, traction cooling, corona and winding treatment to obtain the three-layer co-extruded PE film;
the filter comprises four layers of filter screens, and the specifications of the filter screens are 20 meshes, 150 meshes and 20 meshes in sequence along the melt flow direction; the extrusion capacity of the three-layer co-extrusion film blowing machine is 1272 +/-50 kg/h; the temperature of the internal cooling air inlet is 21-31 ℃ and the temperature of the external cooling air inlet is 13-23 ℃ in the air cooling shaping treatment process; the winding adopts a central surface winding mode, and the winding tension is controlled to be 45-65N;
step 2, compounding: the PET film is subjected to printing treatment and then is compounded with the aluminum foil film through an adhesive for one time to obtain a compound film; then carrying out secondary compounding on the composite film and the three-layer co-extruded PE film through an adhesive to obtain the packaging composite film; the winding tension is gradually reduced in a linear proportion according to the gradual increase of the winding diameter during compounding.
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| CN112442223B (en) * | 2019-09-04 | 2023-02-28 | 中国石油化工股份有限公司 | Polyethylene composition and polyethylene film |
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| CN111703170B (en) * | 2020-07-06 | 2022-07-08 | 黄山永新股份有限公司 | Self-supporting bag packaging material capable of being torn and opened linearly and preparation method thereof |
| CN112659702A (en) * | 2020-12-22 | 2021-04-16 | 黄山永新股份有限公司 | High-humidity-resistance polyethylene film and production method thereof |
| CN112959774A (en) * | 2021-03-29 | 2021-06-15 | 江阴诚公转印包装材料有限公司 | High-barrier microwave special packaging film and preparation method thereof |
| CN113524845A (en) * | 2021-08-11 | 2021-10-22 | 广东骊虹包装有限公司 | Drinking water packaging film and preparation method thereof |
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