CN115923298A - Double-sided enhanced functional film and preparation method thereof - Google Patents
Double-sided enhanced functional film and preparation method thereof Download PDFInfo
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- CN115923298A CN115923298A CN202211599684.2A CN202211599684A CN115923298A CN 115923298 A CN115923298 A CN 115923298A CN 202211599684 A CN202211599684 A CN 202211599684A CN 115923298 A CN115923298 A CN 115923298A
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Abstract
The invention relates to the technical field of food packaging, and particularly discloses a double-sided enhanced functional film and a preparation method thereof. The adhesive force between the base layer and the printing layer is enhanced by printing the enhanced coating layer, and the adhesive force between the base layer and the aluminized layer is enhanced by aluminizing the enhanced coating layer, so that the technical problem that the base layer is dealuminized in the high-temperature disinfection or pasteurization poaching process after aluminizing is solved.
Description
Technical Field
The invention relates to the technical field of food packaging, in particular to a double-sided enhanced functional film and a preparation method thereof.
Background
At present, the common practice of aluminizing and printing polyester films is to perform double-sided corona treatment on the film surface in a line, and a mode of coating one side of the film on the other side of the film for corona treatment can also be used, so that food packaging materials are required to have safety, environmental protection and freshness preservation.
However, in the prior art, the aluminum layer of the conventional corona-treated polyester film is easy to fall off after pasteurization or high-temperature sterilization after an aluminum-plated composite bag is made, the barrier property of a packaging material is reduced, the conventional corona-treated polyester film cannot be used for liquid packaging, the safety and functionality of food packaging cannot be fully met, the adhesion between the polyester film adopting the surface corona treatment technology and ink is low, and the phenomenon of dropping or ink falling is easy to occur in the printing process.
Disclosure of Invention
The invention aims to provide a double-sided enhanced functional film and a preparation method thereof, and aims to solve the technical problems that an aluminum layer of a conventional corona-treated polyester film is easy to fall off after pasteurization or high-temperature sterilization after an aluminum-plated composite bag is made in the prior art, the barrier property of a packaging material is reduced, the conventional corona-treated polyester film cannot be used for liquid packaging, the safety and the functionality of food packaging cannot be fully met, the adhesion between the polyester film adopting a surface corona treatment technology and ink is low, and the phenomenon of point falling or ink falling is easy to occur in the printing process.
In order to achieve the purpose, the double-sided enhanced functional film adopted by the invention comprises a printing layer, a printing enhanced coating layer, a base layer, an aluminized enhanced coating layer and an aluminized layer, wherein the printing enhanced coating layer is coated on the upper surface of the base layer, the aluminized enhanced coating layer is coated on the lower surface of the base layer, the printing layer is arranged on one side of the printing enhanced coating layer, and the aluminized layer is arranged on one side of the aluminized enhanced coating layer.
Wherein, the basic unit includes A surface course and B surface course, is ABA three layer construction, the quantity of A surface course is two-layerly A surface course respectively with B surface course fixed connection, and be located respectively the both sides of B surface course, the printing reinforcing coat with the reinforcing of aluminizing coats the layer and scribbles respectively in corresponding one side of A surface course.
The aluminized reinforced coating layer comprises the following components in parts by mass: 40-50 wt% of aqueous dilute ammonia water resin emulsion, 1-2.5 wt% of catalyst, 2-4 wt% of curing agent, 1-3 wt% of functional assistant and 40-55 wt% of purified water.
The printing enhancement coating layer comprises the following components in parts by mass: 20 to 40 weight percent of water-based acrylic resin emulsion, 0.2 to 0.6 weight percent of functional additive and 60 to 80 weight percent of purified water.
The invention also provides a preparation method of the double-sided enhanced functional film, which is used for preparing the double-sided enhanced functional film and comprises the following steps:
slicing raw materials to prepare the base layer;
crystallizing and drying;
melt extrusion;
casting sheets;
longitudinal stretching;
performing online double-sided surface chemical treatment;
transversely stretching;
drawing and winding;
and (6) cutting and packaging.
Wherein, in the step of crystallization and drying, hot air for drying circulates through the slices to remove most of water absorbed by the hot air and reduce the water content of the hot air to a level which has no obvious influence on the operation of the extrusion process, thereby ensuring that the resin degradation in the melting operation is in an allowable range, a crystallization drying system is required to be arranged on a single-screw extruder, the crystallization temperature is 160-170 ℃, the drying temperature is 165-175 ℃, the drying time is 4-6 h, and a vacuum system is required to be arranged on a double-screw extruder.
Wherein in the melt extrusion step, the polyester chip is remelted by a screw extruder, the molten resin is metered by a gear pump to obtain sufficient pressure to force the molten resin to pass through a filter, finally melt extrusion is carried out, a flat sheet-shaped unstretched film is generated by a die head, the slit opening formed by a die lip can be adjusted on the whole width of the die head, so that the shape of the die lip can be continuously adjusted to an optimized film product with uniform thickness in production, the thickness of the film product is measured by a transversely running thickness gauge which scans at the tail end of a production line, the melting temperature is 275-285 ℃, and the extrusion speed is 30-50 r/min.
Wherein, in the step of the online double-sided surface chemical treatment, the two surfaces of the base layer after longitudinal stretching are firstly subjected to corona treatment, and then the aluminized enhanced coating layer and the printing enhanced coating layer are sequentially and uniformly coated on the two surfaces through an online double-sided surface chemical treatment device which is designed by oneself, wherein, the two corona treatment devices are used for carrying out pre-corona treatment on the two surfaces of the base layer, so that a water-based solvent is better attached to the surface of the base layer when a film passes through a coating anilox roller, the upper coating expanding roller and the lower coating expanding roller flatten the base layer, the wrinkling of the base layer is prevented when the base layer passes through the coating rollers, the upper coating film lifting roller and the lower coating film lifting roller are lifted up through lifting to enable the base layer to leave or contact the coating anilox roller, and the upper edge lifting roller and the lower edge lifting roller lift up the two sides of the base layer when the base layer passes through the coating anilox roller, so that the two sides of the base layer are not coated with the solvent, thereby avoiding the occurrence of chain sticking clamp and being convenient for regeneration and utilization after traction and trimming;
the basic unit loops through indulge and draws export deflector roll, scribble compound corona treatment device, scribble corona treatment device down, first deflector roll, second deflector roll, scribble under and expand the roller, scribble under and lift membrane roller, scribble under and press the limit wheel, scribble under and cover scraper device, scribble under and cover recess reticulation roller, scribble under and cover edge lifting wheel, third deflector roll, scribble on and expand the roller again, scribble on and lift membrane roller again, scribble on and cover scraper device again, scribble on and cover recess reticulation roller, scribble on and cover edge lifting wheel again, export expand wheel and stretch-draw machine.
The double-sided enhanced functional film and the preparation method thereof have the beneficial effects that: the adhesive force between the base layer and the printing layer is enhanced through the printing enhancement coating layer, and the adhesive force between the base layer and the aluminum-plated layer is enhanced through the aluminum-plated enhancement coating layer, so that the technical problem that the base layer is dealuminized in the high-temperature disinfection or pasteurization boiling process after aluminum plating is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of a double-sided reinforced functional film of the present invention.
FIG. 2 is a flow chart of the process steps of a method for preparing a double-sided enhanced functional film according to the present invention.
FIG. 3 is a process flow diagram of the in-line double-sided surface chemistry of the present invention.
1-printing layer, 2-printing reinforced coating layer, 3-base layer, 4-aluminizing reinforced coating layer and 5-aluminizing layer.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Referring to fig. 1, the present invention provides a double-sided enhanced functional film, which includes a printing layer 1, a printing enhanced coating layer 2, a base layer 3, an aluminized enhanced coating layer 4 and an aluminized layer 5, wherein the printing enhanced coating layer 2 is coated on the upper surface of the base layer 3, the aluminized enhanced coating layer 4 is coated on the lower surface of the base layer 3, the printing layer 1 is disposed on one side of the printing enhanced coating layer 2, and the aluminized layer 5 is disposed on one side of the aluminized enhanced coating layer 4.
Further, the base layer 3 comprises an A surface layer and a B surface layer and is of an ABA three-layer structure, the number of the A surface layer is two, the two A surface layers are respectively and fixedly connected with the B surface layer and respectively positioned on two sides of the B surface layer, and the printing enhanced coating layer 2 and the aluminizing enhanced coating layer 4 are respectively coated on one side of the corresponding A surface layer.
Further, the aluminized reinforced coating layer 4 comprises the following components in parts by mass: 40 to 50 weight percent of aqueous dilute ammonia water resin emulsion, 1 to 2.5 weight percent of catalyst, 2 to 4 weight percent of curing agent, 1 to 3 weight percent of functional additive and 40 to 55 weight percent of purified water.
Further, the printing enhancement coating layer 2 comprises the following components in percentage by mass: 20 to 40 weight percent of water-based acrylic resin emulsion, 0.2 to 0.6 weight percent of functional additive and 60 to 80 weight percent of purified water.
Referring to fig. 2, the present invention further provides a method for preparing a double-sided enhanced functional film, which comprises the following steps:
s1: slicing the raw materials to prepare the base layer 3;
s2: crystallizing and drying;
s3: melt extrusion;
s4: casting a sheet;
s5: longitudinal stretching;
s6: performing online double-sided surface chemical treatment;
s7: transversely stretching;
s8: drawing and winding;
s9: and (6) cutting and packaging.
In the step of crystallization and drying, hot air for drying is circulated through the slices to remove most of water absorbed by the hot air and reduce the water content of the hot air to a level which has no obvious influence on the operation of the extrusion process, so that the degradation of the resin in the melting operation is ensured to be within an allowable range, a crystallization drying system is required to be arranged on a single-screw extruder, the crystallization temperature is 160-170 ℃, the drying temperature is 165-175 ℃, the drying time is 4-6 h, and a vacuum system is required to be arranged on a double-screw extruder.
In the melt extrusion step, polyester chips are remelted by a screw extruder, molten resin is metered by a gear pump to obtain sufficient pressure to force the molten resin to pass through a filter, finally melt extrusion is carried out, a flat sheet-shaped unstretched film is produced by a die head, and a slit opening formed by a die lip is adjustable on the whole width of the die head, so that the shape of the die lip can be continuously adjusted to an optimized film product with uniform thickness in production, the thickness of the film product is measured by a thickness gauge which is transversely operated and scanned at the tail end of a production line, the melting temperature is 275-285 ℃, and the extrusion speed is 30-50 r/min.
In the casting process, melt is extruded by a die head and then is rapidly cooled on a quenching roller at the temperature of 20-25 ℃ to form a casting sheet, an extruded base layer 3 is slowly cooled, the crystallization of the extruded base layer is spherical, and the base layer is turbid and becomes brittle so that the processing is not suitable, therefore, the cooling must be rapidly carried out, the base layer 3 is rapidly changed from a liquid state to a glass state, which is an important factor for obtaining the base layer 3 which is amorphous, transparent, stretchable and suitable for further stretching processing, the quenching operation is carried out by extruding the base layer 3 onto a large quenching roller and pressing the large quenching roller tightly against a cold metal surface so as to ensure high heat conductivity, the large quenching roller is attached by using an electrostatic adsorption system, an electric field is generated by a high-pressure metal wire, and the metal wire moves parallel to a die lip at a part vertical to a grounding point of a molten film sheet.
In the longitudinal stretching step, the base layer 3 cast sheet is first stretched in a longitudinal stretching machine, in which cold amorphous film is first preheated to a temperature slightly higher than the glass transition temperature (Tg about 75-80 ℃), the preheating being effected by contact with hot rolls, while the stretchable film sheet is separately stretched in a slow stretching zone, during which external heating is provided by infrared heaters, the stretching ratio in the longitudinal stretching machine being represented by the ratio of the line speeds obtained by the fast and slow rolls; the temperature of the longitudinal drawing machine is 60-90 ℃, and the stretching multiple is 3.0-3.4 times.
In the step of the online double-sided surface chemical treatment, firstly, performing corona treatment on two surfaces of the base layer 3 after longitudinal stretching, and then, coating the aluminized reinforced coating layer 4 and the printing reinforced coating layer 2 on the two surfaces of the base layer 3 uniformly by using an online double-sided surface chemical treatment device which is designed by self, wherein the two corona treatment devices perform pre-corona treatment on the two surfaces of the base layer 3, so that a water-based solvent is better attached to the surface of the base layer 3 when a film passes through a coating anilox roller, the base layer 3 is flattened by using an upper coating expansion roller and a lower coating expansion roller, the base layer 3 is prevented from wrinkling when the film passes through the coating rollers, the upper coating film lifting roller and the lower coating film lifting roller lift the base layer 3 away from or contact the coating anilox roller by lifting, and the two sides of the base layer 3 are lifted by using the upper lifting roller and the lower lifting roller when the base layer 3 passes through the coating anilox roller, so that two sides of the base layer 3 are not coated with the solvent, thereby avoiding chain sticking clamp and facilitating regeneration and edge cutting;
referring to fig. 3, the base layer 3 sequentially passes through a longitudinal drawing outlet guide roller, an upper coating corona treatment device, a lower coating corona treatment device, a first guide roller, a second guide roller, a lower coating expansion roller, a lower coating film lifting roller, a lower coating edge pressing wheel, a lower coating scraper device, a lower coating groove anilox roller, a lower coating edge lifting wheel, a third guide roller, an upper coating expansion roller, an upper coating film lifting roller, an upper coating scraper device, an upper coating groove anilox roller, an upper coating edge lifting wheel, an outlet expansion wheel and a transverse drawing machine.
In the step of transverse stretching, the substrate 3 subjected to the surface chemical treatment on both sides enters an oven, and four transverse stretching process steps of preheating, stretching, heat setting and cooling are sequentially carried out. At the entrance of the oven, the edges of the substrate 3 are gripped by chain grippers mounted on a chain, which then convey the substrate 3 through the oven. In the first stage of the oven, the tracks are arranged in parallel, the substrate 3 is here reheated to slightly above the glass transition temperature, in the second stage, the tracks diverge, the substrate 3 is passed through this stretching zone, being stretched 3.0-3.5 times wider at the outlet, during the stretching process hot air is blown against the substrate 3, the temperature is raised from about 80 ℃ to 120 ℃, in the transverse stretching process, part of the molecular chains and part of the crystals produced in the longitudinal stretching stage will recombine and reorient in the transverse direction, resulting in a so-called "parallel" structure. The base layer 3 after transverse stretching has a structure in which a small amount of crystals are embedded in about 80% of amorphous polymer chains, and the structure is unstable and is considerably shrunk by heating. The transverse stretching preheating temperature is 105-125 ℃, the stretching temperature is 125-150 ℃, the stretching multiple is 3.0-3.5 times, and the shaping temperature is 220-245 ℃. After the mixed solvent is dried and volatilized in the transverse stretching process, a uniform surface chemical treatment layer is formed on the surface of the base layer 3, and the double-sided enhanced functional film is manufactured.
In the step of drawing and winding, the stretched double-sided enhanced functional film is conveyed from the outlet of the oven to a winding machine for winding through a series of drawing rollers, and the drawing rollers are arranged to provide good guiding and stretching of the double-sided enhanced functional film and enable tension between the oven and the winding machine to be properly separated. And a thickness gauge is also arranged on the tractor so as to continuously scan the width of the whole double-sided enhanced functional film and input signals to the closed-loop control system so as to adjust the opening distribution of the die lips to reduce the thickness variation along the width of the whole tractor to the minimum.
In the step of cutting and packaging, a large film roll is wound on a splitting machine, the wound double-sided enhanced functional film is cut into film rolls with different specifications according to the width required by a customer through unwinding, and the film rolls are packaged according to requirements.
In the step of preparing the base layer 3 by the raw material slices, 95-98% of film-grade bright polyester slices and 2-5% of matte slices are used for the surface layer A, and 100% of film-grade bright polyester slices are used for the surface layer B.
In the invention, the polyester film is subjected to double-sided surface treatment by self-designed online surface treatment equipment to form the double-sided enhanced functional film, so that the adhesive force between the surface of the polyester film and the aluminized layer 5 is enhanced on one side, the barrier property to air and water vapor is improved, and the safety and freshness of food packaging are ensured; the adhesion force between the surface of the polyester film and the printing layer 1 is enhanced on the other surface, and common ink can be used for replacing special ink, so that the production cost of packaging is reduced, and the printing enhanced coating layer 2 can also be used for surface printing, so that the printing quality and the printing effect are better;
when the polyester film which is not subjected to surface treatment or corona treatment is subjected to vacuum aluminum plating, the thickness of an aluminum layer is generally not more than 350 angstroms, and the peeling strength is greatly reduced due to the increase of the thickness of the aluminum plating layer 5, so that after the aluminum plating enhanced coating layer 4 is used, the adhesive force of the aluminum plating layer 5 is enhanced, the thickness of the aluminum plating layer 5 can be increased from the conventional 350 angstroms to 680 angstroms, and the barrier property of the vacuum aluminum plating film is greatly enhanced.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A double-sided enhanced functional film is characterized in that,
the printing enhancement coating layer is coated on the upper surface of the base layer, the aluminized enhancement coating layer is coated on the lower surface of the base layer, the printing layer is arranged on one side of the printing enhancement coating layer, and the aluminized layer is arranged on one side of the aluminized enhancement coating layer.
2. The double-sided reinforced functional film according to claim 1,
the basic unit includes A surface course and B surface course, is ABA three layer construction, the quantity of A surface course is two-layer, two-layer A surface course respectively with B surface course fixed connection to be located respectively the both sides of B surface course, the printing reinforcing scribbles the layer with aluminize the reinforcing scribble the layer and scribble respectively in corresponding one side of A surface course.
3. The double-sided reinforced functional film of claim 2,
the aluminized reinforced coating layer comprises the following components in parts by mass: 40-50 wt% of aqueous dilute ammonia water resin emulsion, 1-2.5 wt% of catalyst, 2-4 wt% of curing agent, 1-3 wt% of functional assistant and 40-55 wt% of purified water.
4. The double-sided reinforced functional film according to claim 3,
the printing enhancement coating layer comprises the following components in parts by mass: 20 to 40 weight percent of water-based acrylic resin emulsion, 0.2 to 0.6 weight percent of functional additive and 60 to 80 weight percent of purified water.
5. A method for preparing a double-sided reinforced functional film, which is used for preparing the double-sided reinforced functional film as claimed in claim 4, and is characterized by comprising the following steps:
slicing the raw materials to prepare the base layer;
crystallizing and drying;
melt extrusion;
casting sheets;
longitudinal stretching;
performing online double-sided surface chemical treatment;
transversely stretching;
traction and winding;
and (6) cutting and packaging.
6. The method for preparing a double-sided enhanced functional film according to claim 5,
in the step of crystallization and drying, hot dry air circulates through the slices to remove most of water absorbed by the hot dry air, so that the water content of the hot dry air is reduced to a level which has no obvious influence on the operation of the extrusion process, thereby ensuring that the degradation of the resin in the melting operation is in an allowable range, a crystallization drying system is required to be arranged on a single-screw extruder, the crystallization temperature is 160-170 ℃, the drying temperature is 165-175 ℃, the drying time is 4-6 h, and a vacuum system is required to be arranged on a double-screw extruder.
7. The method for preparing a double-sided enhanced functional film according to claim 6,
in the melt extrusion step, polyester chips are remelted by a screw extruder, molten resin is metered by a gear pump to obtain sufficient pressure to force the molten resin to pass through a filter, finally melt extrusion is carried out, a flat sheet-shaped unstretched film is produced by a die head, and a slit opening formed by a die lip is adjustable on the whole width of the die head, so that the shape of the die lip can be continuously adjusted to an optimized film product with uniform thickness in production, the thickness of the film product is measured by a thickness gauge which is transversely operated and scanned at the tail end of a production line, the melting temperature is 275-285 ℃, and the extrusion speed is 30-50 r/min.
8. The method of claim 7, wherein the film is a double-sided functional film,
in the step of the online double-sided surface chemical treatment, firstly, carrying out corona treatment on two surfaces of the base layer after longitudinal stretching, and then, uniformly coating the aluminized enhanced coating layer and the printing enhanced coating layer on the two surfaces of the base layer by using an online double-sided surface chemical treatment device which is designed by self, wherein two corona treatment devices carry out pre-corona treatment on the two surfaces of the base layer to ensure that a water-based solvent is better attached to the surface of the base layer when a film passes through a coating anilox roller;
the basic unit loops through indulge and draws export deflector roll, scribble compound corona treatment device, scribble corona treatment device down, first deflector roll, second deflector roll, scribble under and expand the roller, scribble under and lift membrane roller, scribble under and press the limit wheel, scribble under and cover scraper device, scribble under and cover recess reticulation roller, scribble under and cover edge lifting wheel, third deflector roll, scribble on and expand the roller again, scribble on and lift membrane roller again, scribble on and cover scraper device again, scribble on and cover recess reticulation roller, scribble on and cover edge lifting wheel again, export expand wheel and stretch-draw machine.
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| CN202211599684.2A CN115923298A (en) | 2022-12-12 | 2022-12-12 | Double-sided enhanced functional film and preparation method thereof |
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| CN202211599684.2A CN115923298A (en) | 2022-12-12 | 2022-12-12 | Double-sided enhanced functional film and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008024372A (en) * | 2006-06-20 | 2008-02-07 | Meiji Seika Kaisha Ltd | Packaging laminated material for chocolate, storing bag for chocolate and chocolate product |
| WO2016058477A2 (en) * | 2014-10-17 | 2016-04-21 | 苏州华源包装股份有限公司 | Anti-counterfeiting film, preparation technique and coating technique for anti-counterfeiting film |
| CN111645313A (en) * | 2020-06-17 | 2020-09-11 | 佛山赛和薄膜科技有限公司 | Biaxial stretching polyester film surface treatment equipment |
| CN111674054A (en) * | 2020-06-17 | 2020-09-18 | 佛山赛和薄膜科技有限公司 | Online surface treatment method for biaxially oriented polyester film |
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- 2022-12-12 CN CN202211599684.2A patent/CN115923298A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008024372A (en) * | 2006-06-20 | 2008-02-07 | Meiji Seika Kaisha Ltd | Packaging laminated material for chocolate, storing bag for chocolate and chocolate product |
| WO2016058477A2 (en) * | 2014-10-17 | 2016-04-21 | 苏州华源包装股份有限公司 | Anti-counterfeiting film, preparation technique and coating technique for anti-counterfeiting film |
| CN111645313A (en) * | 2020-06-17 | 2020-09-11 | 佛山赛和薄膜科技有限公司 | Biaxial stretching polyester film surface treatment equipment |
| CN111674054A (en) * | 2020-06-17 | 2020-09-18 | 佛山赛和薄膜科技有限公司 | Online surface treatment method for biaxially oriented polyester film |
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