CN110744905A - Printable composite forming basement membrane and preparation method thereof - Google Patents
Printable composite forming basement membrane and preparation method thereof Download PDFInfo
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- CN110744905A CN110744905A CN201911022587.5A CN201911022587A CN110744905A CN 110744905 A CN110744905 A CN 110744905A CN 201911022587 A CN201911022587 A CN 201911022587A CN 110744905 A CN110744905 A CN 110744905A
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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
- B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0017—Combinations of extrusion moulding with other shaping operations combined with blow-moulding or thermoforming
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0021—Combinations of extrusion moulding with other shaping operations combined with joining, lining or laminating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0023—Combinations of extrusion moulding with other shaping operations combined with printing or marking
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2007/00—Flat articles, e.g. films or sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2009/00—Layered products
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/24—All layers being polymeric
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/306—Resistant to heat
-
- 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
-
- 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
- B32B2439/00—Containers; Receptacles
- B32B2439/70—Food packaging
Abstract
The invention relates to a printable composite forming base film, which sequentially comprises the following components from top to bottom: CPP layer, printing layer, adhesive layer, PA layer, barrier layer and heat-seal layer, wherein: the thickness of the CPP layer is 30 mu m; the printing layer is boiled ink; the adhesive layer is a solvent-free adhesive; the PA layer, the barrier layer and the heat sealing layer are co-extruded films and are prepared by a multi-layer co-extrusion process; the thickness of the co-extrusion film is 100-200 μm. The invention also relates to a preparation method of the printable composite forming base film. According to the invention, by improving the structure of the composite molding basement membrane, the problem of ink falling off is solved, the curling problem can be effectively improved, and the curling degree is improved; the preparation method can effectively improve the peeling strength of the composite forming basement membrane and avoid the delamination of the composite forming basement membrane during forming.
Description
Technical Field
The invention relates to the technical field of food forming packaging films, in particular to a printable composite forming base film and a preparation method thereof.
Background
Usually when the basement membrane is made to crowded membrane altogether, use the transparent film as the owner, if need add the printing design, then can only adopt the table printing technology to print on the surface of crowded membrane altogether, but the table printing is most insecure, and in stretch forming process, because the printing ink adhesion force is less than the power that produces when the membrane is stretched, printing ink easily drops, causes other products of pollution, influences the pleasing to the eye scheduling problem of packing. In addition, in the using process of a client, the co-extruded film passes through the oven when being printed, and after the co-extruded film is heated, the shrinkage rate is inconsistent, so that the shrinkage film is curled inwards, the printed pattern is deformed, the cursor tracking is difficult, and the next overprinting is influenced. Meanwhile, the surface printing ink is only suitable for heating at 80-100 ℃ such as water boiling and the like at present, and heating above 100 ℃ such as boiling and the like cannot be realized temporarily, so that the co-extruded film is not suitable for packaging design with printing in actual use.
For example, chinese patent publication No. CN106346926A is the research content of the present applicant on co-extruded films. Because the surface layer of the co-extruded film is PA, and PA is very easy to absorb water, bubbles are very easy to generate when the co-extruded film is compounded with other films, and the co-extruded film is difficult to be used as a bottom film with printing in the field of packaging. And when the co-extruded film is used as the bottom film, severe curling can be generated after sterilization treatment, and customers also complain of the problems for many times.
In order to solve the above problems, the present applicant proposed a printable composite molded base film and a method for preparing the same.
Disclosure of Invention
The invention aims to provide a printable composite forming basement membrane, which solves the problem of ink falling off by improving the structure of the composite forming basement membrane, can effectively improve the curling problem and improves the curling degree; the preparation method can effectively improve the peeling strength of the composite forming basement membrane and avoid the composite forming basement membrane from layering during forming.
In order to achieve the above object, a first aspect of the present invention provides a printable composite molding base film, comprising, from top to bottom: CPP layer, printing layer, adhesive layer, PA layer, barrier layer and heat-seal layer, wherein:
the thickness of the CPP layer is 30 mu m;
the printing layer is boiled ink;
the adhesive layer is a solvent-free adhesive;
the PA layer, the barrier layer and the heat sealing layer are co-extruded films and are prepared by a multi-layer co-extrusion process; the thickness of the co-extrusion film is 100-200 μm.
CPP of Hui Shi plastic industry of Xiantao city is selected as CPP; the water-boiled ink is UMT99-F grade or UMT99-R grade water-boiled series ink produced by Suzhou Zhongya ink Co.
Preferably, the PA layer is PA.
Preferably, the barrier layer is EVOH or PA.
Preferably, the heat-sealing layer is PE or PP.
Preferably, the solvent-free adhesive is WD4120/XR 1500.
The solvent-free adhesive is produced by Fule corporation.
The second aspect of the invention provides a method for preparing a printable composite molded base film, which comprises the following steps:
s1) preparing a co-extruded film: respectively putting raw material particles of the PA layer, the barrier layer and the heat sealing layer into an extruder, forming a pipe blank through a die head, and slitting the pipe blank after secondary blowing to obtain a co-extruded film;
s2) CPP layer printing: printing on the upper surface of the CPP, wherein the printing equipment is a 10-color machine of northern Shaanxi, and the viscosity of the ink is 11-15 Pa.s; after printing is finished, drying the CPP by an oven to obtain a CPP layer/printing layer;
s3) gluing: coating a solvent-free adhesive on the surface of the printing layer of the CPP layer/printing layer obtained in the step S2 to form an adhesive layer;
s4) heating pretreatment of the co-extruded film: heating the co-extruded film prepared in the step S1 for pretreatment, wherein the treatment temperature is 45 ℃ and the treatment time is 12 hours;
s5) compounding: and (3) after performing online corona on the surface of the PA layer of the co-extruded film treated in the step S4, enabling the corona surface of the co-extruded film to be opposite to the adhesive layer formed in the step S2, and compounding on a solvent-free compounding machine, wherein the parameters of the compounding machine are set as follows: compounding at 40 deg.c to form printable composite film, high temperature curing and rolling.
Preferably, the thickness uniformity of the co-extruded film in the step S1 has an average deviation of less than or equal to 3% and a limit deviation of less than or equal to 5%.
Preferably, the oven temperature in step S2: 50-40 ℃.
Preferably, in step S5, the printable composite molded base film is left at room temperature for 24 to 48 hours and then cured at high temperature.
Wherein, the printing equipment is a 10-color machine for northern Shaanxi; the solventless laminator is nodemel (shanghai) machines ltd.
Because the surface layer of the CO-extruded film is PA, the PA is very easy to absorb water, and the adhesive contains a certain amount of NCO, when the CPP is compounded with the CO-extruded film, water attached to the PA layer can react with NCO in the adhesive to generate CO2So that bubbles can be formed in the composite film, the peeling strength of the composite film is reduced, and the composite film is layered. After the co-extruded film is subjected to heating pretreatment in the step S4, the water content of PA can be reduced, the composite strength of the composite film is improved, and the risk of delamination of the composite film is reduced.
The PA layer of the co-extruded film has high roughness, so that the leveling effect of the adhesive on the surface of the PA layer is reduced, and after the co-extruded film is placed at room temperature for 24 to 48 hours, the adhesive can eliminate a small amount of air bubbles generated during compounding of the adhesive layer through secondary leveling, so that the peeling strength of the composite film is further improved.
Compared with the prior art, the printable composite forming basement membrane and the preparation method thereof have the following advantages:
1. the printable composite forming base film keeps the original tensile forming performance, simultaneously increases the printing design, improves the aesthetic property, solves the cursor tracking problem of a client in the production process, and can also solve the problems of ink falling and pattern deformation in the tensile forming process;
2. the printable composite forming bottom film effectively reduces the problem of curling after being heated, and the PA layer in the co-extruded film is arranged in the middle layer of the composite forming bottom film, so that on one hand, the contact with air can be reduced, the water content of the PA layer is reduced, on the other hand, the internal stress of the PA layer is reduced through compounding, and the curling problem can be effectively improved;
3. the printable composite forming base membrane can be applied to the field of cooking, and the printing layer prepared by the cooking-resistant ink is improved by the process, so that the adhesive force of the ink and the peeling strength of the printable composite forming base membrane are improved.
Detailed Description
The present invention will be further described with reference to the following specific examples.
The abbreviations in the present invention are explained as follows:
CPP: casting a polypropylene film;
ink: printing layer;
TIE: an adhesive layer;
PA: a polyamide;
EVOH (3) in the following ratio: ethylene-vinyl alcohol copolymers;
PE: polyethylene;
PP: polypropylene.
Example 1
The printable composite carrier film structure of this embodiment is, from top to bottom: CPP layer, printing layer (ink), adhesive layer (TIE), PA layer, barrier layer and heat-seal layer, wherein:
the CPP layer is CPP produced by Hui lion plastic industry Limited liability company in Xiantao city, and the thickness is 30 μm;
the printing layer is UMT99-F level water boiling series ink produced by Suzhou Zhongya ink limited company;
the adhesive layer is a solvent-free adhesive produced by Fule corporation, and the model is WD4120/XR 1500;
the PA layer, the barrier layer and the heat sealing layer are co-extruded films and are prepared by a multi-layer co-extrusion process;
in the embodiment, the thickness of the co-extrusion film is 100 μm, the structure of the co-extrusion film is PA layer, the barrier layer is EVOH layer, and the heat sealing layer is PE layer.
The preparation method of the printable composite forming base film of the embodiment comprises the following steps:
s1) preparing a co-extruded film: respectively putting raw material particles of PA, EVOH and PE into an extruder, forming a pipe blank through a die head, performing secondary blowing on the pipe blank, and slitting to obtain a co-extruded film, wherein the average thickness uniformity deviation of the co-extruded film is less than or equal to 3%, and the limit deviation of the co-extruded film is less than or equal to 5%;
s2) CPP layer printing: printing on the upper surface of the CPP, wherein the printing equipment is a 10-color machine of northern Shaanxi, and the viscosity of the ink is 11S; after the printing is finished, the CPP is dried by an oven to obtain CPP/ink, and the temperature of the oven is as follows: 50 ℃;
s3) gluing: coating a solvent-free adhesive on the ink surface of the CPP/ink obtained in the step S2 to form an adhesive layer;
s4) heating pretreatment of the co-extruded film: heating the co-extruded film prepared in the step S1 for pretreatment, wherein the treatment temperature is 45 ℃ and the treatment time is 12 hours;
s5) compounding: the PA side of the coextruded film treated in step S4 was subjected to on-line corona treatment, and the adhesive layer formed in step S2 was laminated on a solvent-free laminating machine manufactured by nodemeat (shanghai) machines ltd, the parameters of which were set as follows: compounding at 40 deg.c to form composite printable film, and high temperature curing and rolling.
Because the surface layer of the CO-extruded film is PA, the PA is very easy to absorb water, the adhesive contains a small amount of NCO, when the CPP is compounded with the CO-extruded film, water attached to the PA layer can react with NCO in the adhesive to generate CO2So that bubbles can be formed in the composite film, the peeling strength of the composite film is reduced, and the composite film is layered. After the heating pretreatment of the co-extruded film in the step S4, the water content of the PA can be reducedThe composite strength of the composite film is improved, and the risk of layering of the composite film is reduced.
More preferably, in step S5, the printable composite molded base film is cured at high temperature after being placed at room temperature for 24 to 48 hours, which is because the co-extruded film has a PA layer with high roughness, so that the leveling effect of the adhesive on the PA layer surface is reduced, and after being placed at room temperature for 24 to 48 hours, the adhesive is leveled for the second time, so that a small amount of bubbles generated during the compounding of the adhesive layer can be eliminated, thereby further improving the peel strength of the composite film.
Example 2
The printable composite carrier film structure of this example is the same as that of example 1, except that,
the CPP is 50 μm;
the printing layer is UMT99-R grade water boiling series ink produced by Suzhou Zhongya ink limited company;
the co-extrusion film structure is that the PA layer is PA, the barrier layer is EVOH, and the heat-seal layer is PP, namely the co-extrusion film structure is PA/EVOH/PP, and the thickness of the co-extrusion film in the embodiment is 130 mu m.
The printable composite molded base film of this example was prepared in the same manner as in example 1, except that in step S2, the viscosity of the ink was 12S; oven temperature: 45 ℃;
example 3
The printable composite carrier film structure of this example is the same as that of example 1, except that,
the CPP is 70 μm;
the co-extrusion film structure is that the PA layer is PA, the barrier layer is PA, and the heat-seal layer is PE, namely the co-extrusion film structure is PA/PA/PE, and the thickness of the co-extrusion film in the embodiment is 180 μm.
The printable composite molded base film of this example was prepared in the same manner as in example 1, except that in step S2, the viscosity of the ink was 13S; oven temperature: at 45 ℃.
Example 4
The printable composite carrier film structure of this example is the same as that of example 1, except that,
the CPP is 100 mu m;
the printing layer is UMT99-R grade water boiling series ink produced by Suzhou Zhongya ink limited company;
the co-extrusion film structure is that the PA layer is PA, the barrier layer is EVOH, and the heat-seal layer is PP, namely the co-extrusion film structure is PA/PA/PP, and the thickness of the co-extrusion film in the embodiment is 200 mu m.
The printable composite molded base film of this example was prepared in the same manner as in example 1, except that in step S2, the viscosity of the ink was 15S; oven temperature: 40 ℃;
comparative example 1
The printable composite carrier film of this comparative example was constructed as in example 1.
The printable composite molded carrier film of this comparative example was prepared in the same manner as in example 1, except that step S4 was not included.
Comparative example 2
The formed base film of the comparative example is a high-speed packaging multi-layer co-extrusion thermoforming stretching base film in Chinese patent with the publication number of CN106346926A of the company.
And (3) performance testing:
the performance tests of examples 1-4 and comparative example 1 included the following aspects, and the test results are shown in Table 1:
1. peel strength: the peel strength test of the composite molded base films prepared in examples 1 to 4 and comparative examples 1 to 2 was carried out by using GB 8808 peeling test method for soft composite plastic materials, and the base films were qualified when the peel strength was greater than 6N; otherwise, it is not qualified.
2. Elongation at break and tensile strength: the composite molding basement membrane prepared in the examples 1-4 and the comparative examples 1-2 is cut into strip-shaped sample strips, and the specification of the sample strips is as follows: the length is more than or equal to 150mm, the width is 15mm +/-0.5 mm, the sample gauge length is 100mm +/-1 mm, the composite forming basement membranes prepared in the examples 1 to 4 and the comparative examples 1 to 2 are tested for the elongation at break and the tensile strength by adopting GBT 1040.3-2006 test for the tensile property of plastics, the tensile speed (no load) of the sample is 250mm/min +/-25 mm/min,
when the elongation at break is more than 50N/15mm, the product is qualified; otherwise, the product is unqualified;
when the tensile strength is more than 600 percent, the product is qualified; otherwise, it is not qualified.
3. The degree of curling: the composite molding basement membrane prepared in the examples 1-4 and the comparative examples 1-2 is cut into a sample strip, and the specification of the sample strip is as follows: fixing one end of the sample strip on a horizontal table top by using an adhesive tape, measuring the length of the curled sample strip by using the size, wherein if the measured length is more than 45mm, the curling degree is qualified, and otherwise, the curling degree is unqualified.
TABLE 1
| Example 1 | Example 2 | Example 3 | Example 4 | Comparative example 1 | Comparative example 2 | |
| Peel strength | Qualified | Qualified | Qualified | Qualified | Fail to be qualified | / |
| Elongation at break | Qualified | Qualified | Qualified | Qualified | Qualified | Fail to be qualified |
| Tensile strength | Qualified | Qualified | Qualified | Qualified | Qualified | Qualified |
| Degree of curling | Qualified | Qualified | Qualified | Qualified | Qualified | Fail to be qualified |
From the experimental results, it can be seen that: the pretreated co-extruded film has obviously improved peel strength and no delamination phenomenon in the forming process. The surface layer of the CO-extruded film is PA, the PA is very easy to absorb water, and when the CPP is compounded with the CO-extruded film, water attached to the PA layer can react with NCO in the adhesive to generate CO2So that bubbles can be formed in the composite film, the peeling strength of the composite film is reduced, and the composite film is layered. After the CO-extruded film is subjected to heating pretreatment, the water content of PA can be reduced, and the reaction of water and NCO in the adhesive for producing CO is inhibited2To avoid the formation of bubbles in the composite forming basement membraneLow risk of delamination of the composite film.
The compound formed basement membrane has higher crimpness, is not easy to crimp after sterilization treatment, and keeps the stretching forming performance of the co-extruded membrane on the one hand; on the other hand, because the CPP has higher stiffness and can reduce the internal stress of the surface of the PA after compounding, the compound formed basement membrane can not curl after the compound formed basement membrane is sterilized.
While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the invention is not limited to the embodiments disclosed, but is intended to cover various modifications, equivalents and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A printable composite carrier film, comprising, in order from top to bottom: CPP layer, printing layer, adhesive layer, PA layer, barrier layer and heat-seal layer, wherein:
the thickness of the CPP layer is 30 mu m;
the printing layer is boiled ink;
the adhesive layer is a solvent-free adhesive;
the PA layer, the barrier layer and the heat sealing layer are co-extruded films and are prepared by a multi-layer co-extrusion process; the thickness of the co-extrusion film is 100-200 μm.
2. The printable composite carrier film of claim 1, wherein the PA layer is PA.
3. The printable composite carrier film of claim 1, wherein the barrier layer is EVOH or PA.
4. A printable composite carrier film according to claim 1, wherein the heat-seal layer is PE or PP.
5. The printable composite carrier film according to claim 1, wherein the solvent-free adhesive is WD4120/XR 1500.
6. A method of preparing a printable composite carrier film according to any one of claims 1 to 5, comprising the steps of:
s1) preparing a co-extruded film: respectively putting raw material particles of the PA layer, the barrier layer and the heat sealing layer into an extruder, forming a pipe blank through a die head, and slitting the pipe blank after secondary blowing to obtain a co-extruded film;
s2) CPP layer printing: printing on the upper surface of the CPP, wherein the printing equipment is a 10-color machine of northern Shaanxi, and the viscosity of the ink is 11-15 Pa.s; after printing is finished, drying the CPP by an oven to obtain a CPP layer/printing layer;
s3) gluing: coating a solvent-free adhesive on the surface of the printing layer of the CPP layer/printing layer obtained in the step S2 to form an adhesive layer;
s4) heating pretreatment of the co-extruded film: heating the co-extruded film prepared in the step S1 for pretreatment, wherein the treatment temperature is 45 ℃ and the treatment time is 12 hours;
s5) compounding: and (3) after performing online corona on the surface of the PA layer of the co-extruded film treated in the step S4, enabling the corona surface of the co-extruded film to be opposite to the adhesive layer formed in the step S2, and compounding on a solvent-free compounding machine, wherein the parameters of the compounding machine are set as follows: compounding at 40 deg.c to form composite printable film, and high temperature curing and rolling.
7. The method of claim 6, wherein the average thickness uniformity of the co-extruded film in step S1 is less than or equal to 3%, and the limit deviation is less than or equal to 5%.
8. The method of claim 6, wherein the oven temperature in step S2 is: 50-40 ℃.
9. The method of claim 6, wherein the compounded printable composite carrier film is cured at high temperature after being left at room temperature for 24 to 48 hours in step S5.
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| CN201911022587.5A CN110744905A (en) | 2019-10-25 | 2019-10-25 | Printable composite forming basement membrane and preparation method thereof |
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| CN201911022587.5A CN110744905A (en) | 2019-10-25 | 2019-10-25 | Printable composite forming basement membrane and preparation method thereof |
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| CN110744905A true CN110744905A (en) | 2020-02-04 |
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| CN111993733A (en) * | 2020-09-04 | 2020-11-27 | 江阴升辉包装材料有限公司 | Film for color molding and production method thereof |
| CN113013181A (en) * | 2021-02-23 | 2021-06-22 | 京东方科技集团股份有限公司 | Display substrate, preparation method thereof and display device |
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| CN108454201A (en) * | 2018-04-10 | 2018-08-28 | 广州市瑞高包装工业有限公司 | Flexible package composite material and preparation method thereof and packaging tube |
| CN110293722A (en) * | 2019-06-25 | 2019-10-01 | 广东爱丽斯包装有限公司 | A kind of combined package bag and preparation method thereof with low temperature drop resistance |
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