CN111993733A - Film for color molding and production method thereof - Google Patents
Film for color molding and production method thereof Download PDFInfo
- Publication number
- CN111993733A CN111993733A CN202010918215.7A CN202010918215A CN111993733A CN 111993733 A CN111993733 A CN 111993733A CN 202010918215 A CN202010918215 A CN 202010918215A CN 111993733 A CN111993733 A CN 111993733A
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- printing
- film
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- color
- ink
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—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
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
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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
-
- 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
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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
- 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
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/402—Coloured
- B32B2307/4023—Coloured on the layer surface, e.g. ink
-
- 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
- B32B2439/40—Closed containers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to a color forming film and a production method thereof, wherein the color forming film sequentially comprises a composite base material, an ink layer and a co-extrusion forming material from top to bottom; the ink layer is internally printed with ink and is coated on the surface of the co-extrusion molding material by roller to form a printing film; glue is coated between the composite base material and the ink layer of the printing film. The production method comprises the steps of pre-treating the co-extruded material, and carrying out corona treatment on one surface of the co-extruded material; printing a co-extrusion forming material, namely printing an ink layer on the corona treatment surface of the co-extrusion forming material; curing after printing; compounding, namely compounding the cured printing film with a composite base material; curing after compounding, fully curing the compounded material, and finally forming the color forming film. Compared with the prior art, the invention has the advantages of convenient production scheduling and flexible production; the color requirement is met, and meanwhile, the use requirement of the molded package can be met.
Description
Technical Field
The invention relates to the technical field of packaging films, in particular to a forming film with a color effect and a production method thereof.
Background
The formed package has the advantages of wide application range, high package production efficiency, capability of designing the size and the shape of the package according to requirements and the like, and is widely applied to the food packaging industry. Due to the requirement of formability, the formed package generally uses a film produced by a multi-layer co-extrusion method as a bottom film portion of the raw material of the package, i.e., a portion requiring forming treatment.
However, multilayer coextruded films are limited by the materials, most of which appear transparent or whitish, and are not suitable for packaging some contents that do not require or are less suitable for visible light. If a colored multilayer co-extruded film needs to be obtained, a color master additive is often required to be added; and if the color master is added, the addition of the color master can lead to uniform running during the beginning of production and large loss of cleaning production after the end of production, and the production scheduling is very inflexible.
Meanwhile, the color master batch addition production also has the following defects: 1. the color difference between batches is difficult to control; 2. only single pure color multilayer co-extruded films can be manufactured; 3. the switching loss in the production of the multilayer co-extruded films with different colors is large; 4. the color master batch has insufficient brightness, and many bright colors are only organic pigments, so that the color master batch is not suitable for high-temperature processing (the multilayer co-extrusion needs about 190 ℃ at least).
In view of the above, it is necessary to develop a novel color forming film to overcome the problems of the conventional color forming film and the manufacturing process thereof.
Disclosure of Invention
The invention aims to provide a color forming film and a production method thereof, which aim to overcome the problems of the conventional color forming film and the manufacturing process thereof and obtain the color forming film with more abundant colors.
In order to achieve the above object, a first aspect of the present invention provides a color-forming film which is a film product having both vivid colors (single or multiple colors, and a random shape consisting of colors) and also having formability; the ink is characterized by comprising a composite base material, an ink layer and a co-extrusion molding material from top to bottom in sequence;
the composite base material is a PP/PE/APET material film material which is not subjected to stretching treatment;
the thickness of the composite base material is not less than 30um and not more than 50 um;
the co-extrusion molding material is a high-barrier/middle-barrier/non-barrier multilayer co-extrusion film material produced in a down-blowing or tape casting manner;
the thickness of the co-extrusion molding material is 30-180 um;
the ink layer is internally printed with ink and is coated on the surface of the co-extrusion molding material by roller to form a printing film;
glue is coated between the composite base material and the ink layer of the printing film.
As a further improvement of the invention, the composite substrate is a CPP/CPE/APET film.
As a further improvement of the invention, the inner printing ink used by the ink layer is mixed with a curing agent.
The second aspect of the present invention provides a method for producing the above color-forming film, comprising the steps of:
producing by using a multi-layer co-extrusion technology and using a die head with 8-11 layers;
the co-extrusion molding material is divided into a heat sealing layer and a non-heat sealing layer;
carrying out corona treatment on the non-heat-sealing surface of the co-extrusion molding material produced in the step 1;
printing an ink layer on the corona treatment surface of the co-extrusion molding material by adopting roll printing to form a printing film;
step 4, curing after printing;
placing the printing film into a curing chamber, and curing for more than 24 hours at the temperature of 40-50 ℃;
step 5, compounding;
compounding the cured printing film with a composite base material;
the ink layer is positioned between the composite base material and the co-extrusion forming material;
step 6, curing after compounding;
fully curing the compounded material to finally form a color forming film;
the high-temperature curing condition is 36-50 ℃ for 48 hours.
As a further improvement of the present invention, in step 1, a surface layer material of the non-heat-sealing layer is PA or PE, and the non-heat-sealing layer needs to be subjected to corona treatment.
Furthermore, in the step 1, PA is taken as the surface layer of the non-heat-sealing layer, and the concentration of the slipping agent corresponding to the heat-sealing layer is controlled to be 800 +/-50 ppm;
in the step 2, PA is used as the surface layer of the corona surface, and the corona value is 50-60 dyne.
Furthermore, in the step 1, PE is taken as the surface layer of the non-heat-sealing layer, and the concentration of the slipping agent corresponding to the heat-sealing layer is controlled to be 600 +/-50 ppm;
in the step 2, the PE is used as the surface layer of the corona surface, and the corona value is 35-45 dyne.
As a further improvement of the present invention, in step 3, the ink used in the ink layer 3 is an inner printing ink; before the inner printing ink is used, a curing agent is mixed.
As a further improvement of the present invention, in the step 3, full color and/or pattern printing is performed by using a printing process to form a color or pattern ink layer on the co-extrusion molding material.
As a further improvement of the invention, in the step 6, low-temperature curing is performed before high-temperature curing, wherein the low-temperature curing condition is 20-35 ℃ for 12-24 hours.
Compared with the prior art, the invention has the advantages and beneficial effects that:
1. compared with a colored co-extruded film, the production scheduling is convenient and the production is flexible; the printing is not limited to the multi-layer co-extruded film, and the multi-layer co-extruded film has no color or has the same color as the whole, and the printing can use the combination of various colors (without limitation) and printing patterns (some irregular patterns can bring corresponding deformation of the patterns because the size of the formed material can be changed);
2. the forming film can meet the use requirement, and a printing and compounding process is added for the purpose of diversifying the packaging color; the technology has a protective effect on the color, and avoids the production difficulty caused by only surface printing and the risk of ink falling in the subsequent processing;
3. the color requirement is met, and meanwhile, the use requirement of the molded package can be met.
Drawings
FIG. 1 is a schematic diagram of the structural hierarchy of the present invention.
Detailed Description
The invention is further described below with reference to the following figures and specific examples.
The invention provides a film for color molding, which is a film product with bright colors and molding capability; the color forming film is produced by adopting the following steps:
adopting a down-blowing method or a tape casting method for production;
the production is carried out by using a multi-layer co-extrusion technology and using 8-11 layers of die heads; the existing 8-12 extruders are adopted;
the production of the extrusion machine of the edge-wrapping material by adopting the tape casting method is more than that of the down-blowing method with the same layer number;
the co-extrusion molding material is divided into a heat sealing layer and a non-heat sealing layer.
The concentration of the slipping agent added in the heat sealing layer needs to be controlled;
for the surface layer of the non-heat-sealing layer is PA, the slipping agent corresponding to the heat-sealing layer is preferably controlled to be about 800 ppm;
for the surface layer of the non-heat-sealing layer is PE, the slip agent corresponding to the heat-sealing layer is preferably controlled to be about 600 ppm.
The co-extrusion forming material generated in the steps is a high-barrier/medium-barrier/non-barrier multilayer co-extrusion film material.
The non-heat-seal layer (i.e. the subsequent corona side) does not need a slipping agent, but the semi-finished film roll needs to control the content of the slipping agent of the heat-seal layer to reduce the influence of poor corona effect caused by contact migration because the non-heat-seal layer is next to the heat-seal layer in a roll state.
Selecting the co-extrusion molding material produced in the step 1, wherein the thickness of the co-extrusion molding material is 2, 30-180 um, and the material is coiled or sheet;
carrying out corona treatment on the non-heat-sealing surface of the co-extrusion molding material 2;
the corona treatment adopts off-line corona treatment or on-line corona treatment;
the surface layer of the corona surface is made of PE, and the corona value requires 35-45 dyne (dyn);
the surface layer of the corona surface is made of PA, and the corona value is required to be 50-60 dyne (dyn);
and after the co-extrusion molding material 2 is subjected to corona treatment, printing is carried out within 1-2 days.
Printing an ink layer 3 on the corona treatment surface of the co-extrusion molding material 2 by adopting roller printing;
the ink adopted by the ink layer 3 is inner printing ink; before the inner printing ink is used, a curing agent is mixed;
the adhesion force between the mixed curing agent and the printing material can be enhanced, and the problem of color delamination during the molding of the subsequent material is avoided.
And printing the color and/or disordered pattern on the co-extrusion molding material 2 by using a roll stamp, wherein the printed co-extrusion molding material 2 is called a printing film.
After printing, the pure color is generally full-page printing; and the pattern is an irregular, disordered pattern.
The irregular unordered pattern is different from the pattern content which is printed according to the requirement of a client; the irregular disordered pattern is similar to an abstract pattern, and after the color forming film is formed, the film can deform according to the shape of a die in the stretching forming process to cause the deformation of the pattern in a deformation area, so that the irregular disordered pattern has no specific meaning or significance and mainly plays a role in decorating shading.
Step 4, curing after printing
And (3) putting the printed co-extruded molding material 2 and the printing ink layer 3, namely the printing film, into a curing chamber together, and curing for more than 24 hours at the temperature of 40-50 ℃.
Step 5, compounding
The cured printed film (co-extrusion molding material 2 and ink layer 3) is combined with the composite base material 1.
The thickness of the composite substrate 1 is not less than 30um, and generally not more than 50 um;
the composite base material 1 is a PP/PE/APET material film material which is not subjected to stretching treatment; in particular CPP/CPE/APET films.
Glue is smeared between the ink layer 3 and the composite substrate 1, the smearing amount of the glue needs to be increased, and the problem of color separation during the forming of subsequent materials is avoided.
After the compounding, the ink layer 3 is interposed between the composite base material 1 and the co-extruded material 2, so that the ink layer 3 is protected from being scratched and scraped off in the subsequent use.
Step 6, curing after compounding
The compounded material is fully cured to finally form the color molding film.
(1) For the composite film of the high-barrier co-extrusion molding material, the composite film needs to be cured in a mode of converting low-temperature curing into high-temperature curing, so that the defect of bubble quality caused by the fact that gas generated by reaction cannot escape in time due to too fast curing is avoided; the low-temperature curing condition is 20-35 ℃ and 12-24 hours; the high-temperature curing condition is 36-50 ℃ for 48 hours.
(2) For the composite film of the non-high-barrier co-extrusion molding material, the high-temperature curing condition is directly adopted; the high-temperature curing condition is 36-50 ℃ for 48 hours.
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 capable of various modifications and substitutions without departing from the spirit of the invention.
Claims (9)
1. A color forming film is characterized by sequentially comprising a composite base material, an ink layer and a co-extrusion forming material from top to bottom;
the composite base material is a PP/PE/APET material film material which is not subjected to stretching treatment;
the thickness of the composite base material is not less than 30um and not more than 50 um;
the co-extrusion molding material is a high-barrier/middle-barrier/non-barrier multilayer co-extrusion film material produced in a down-blowing or tape casting manner;
the thickness of the co-extrusion molding material is 30-180 um;
the ink layer is internally printed with ink and is coated on the surface of the co-extrusion molding material by roller to form a printing film;
glue is coated between the composite base material and the ink layer of the printing film.
2. The film for color formation according to claim 1, wherein a curing agent is mixed in an inner printing ink used for the ink layer.
3. A method for producing a color-forming film, characterized by comprising the steps of:
step 1, producing a co-extrusion molding material; adopting a down-blowing method or a tape casting method for production;
producing by using a multi-layer co-extrusion technology and using a die head with 8-11 layers;
the co-extrusion molding material is divided into a heat sealing layer and a non-heat sealing layer;
step 2, preprocessing the co-extrusion molding material before compounding;
carrying out corona treatment on the non-heat-sealing surface of the co-extrusion molding material produced in the step 1;
step 3, printing the co-extrusion molding material;
printing an ink layer on the corona treatment surface of the co-extrusion molding material by adopting roll printing to form a printing film;
step 4, curing after printing;
placing the printing film into a curing chamber, and curing for more than 24 hours at the temperature of 40-50 ℃;
step 5, compounding;
compounding the cured printing film with a composite base material;
the ink layer is positioned between the composite base material and the co-extrusion forming material;
step 6, curing after compounding;
fully curing the compounded material to finally form a color forming film;
the high-temperature curing condition is 36-50 ℃ for 48 hours.
4. The method of claim 3, wherein in step 1, the surface material of the non-heat-seal layer is PA or PE, and the non-heat-seal layer is subjected to corona treatment.
5. The method for producing a color-forming film according to claim 4,
in the step 1, PA is taken as the surface layer of the non-heat-sealing layer, and the concentration of the slipping agent corresponding to the heat-sealing layer is controlled to be 800 +/-50 ppm;
in the step 2, PA is used as the surface layer of the corona surface, and the corona value is 50-60 dyne.
6. The method for producing a color-forming film according to claim 4,
in the step 1, PE is taken as the surface layer of the non-heat-sealing layer, and the concentration of the slipping agent corresponding to the heat-sealing layer is controlled to be 600 +/-50 ppm;
in the step 2, the PE is used as the surface layer of the corona surface, and the corona value is 35-45 dyne.
7. The method for producing a color forming film according to claim 3, wherein in the step 3, the ink used in the ink layer 3 is an inner printing ink; before the inner printing ink is used, a curing agent is mixed.
8. The method of claim 3, wherein in step 3, the co-extrusion material is printed with a full color and/or pattern by a printing process to form a color or pattern ink layer.
9. The method for producing a color-forming film according to claim 3, wherein in the step 6, the film is subjected to low-temperature aging at 20 to 35 ℃ for 12 to 24 hours before the high-temperature aging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010918215.7A CN111993733A (en) | 2020-09-04 | 2020-09-04 | Film for color molding and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010918215.7A CN111993733A (en) | 2020-09-04 | 2020-09-04 | Film for color molding and production method thereof |
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| Publication Number | Publication Date |
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| CN111993733A true CN111993733A (en) | 2020-11-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010918215.7A Pending CN111993733A (en) | 2020-09-04 | 2020-09-04 | Film for color molding and production method thereof |
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| CN (1) | CN111993733A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114834171A (en) * | 2022-04-13 | 2022-08-02 | 福建省凯安包装科技有限公司 | Environment-friendly printing process of polyethylene packaging material |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109591413A (en) * | 2018-11-12 | 2019-04-09 | 江阴升辉包装材料有限公司 | A kind of composite coloured sheet material and the preparation method and application thereof |
| CN110744905A (en) * | 2019-10-25 | 2020-02-04 | 江阴升辉包装材料有限公司 | Printable composite forming basement membrane and preparation method thereof |
| CN110744906A (en) * | 2019-10-25 | 2020-02-04 | 江阴升辉包装材料有限公司 | Air-conditioning hard cover film and production process thereof |
-
2020
- 2020-09-04 CN CN202010918215.7A patent/CN111993733A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109591413A (en) * | 2018-11-12 | 2019-04-09 | 江阴升辉包装材料有限公司 | A kind of composite coloured sheet material and the preparation method and application thereof |
| CN110744905A (en) * | 2019-10-25 | 2020-02-04 | 江阴升辉包装材料有限公司 | Printable composite forming basement membrane and preparation method thereof |
| CN110744906A (en) * | 2019-10-25 | 2020-02-04 | 江阴升辉包装材料有限公司 | Air-conditioning hard cover film and production process thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114834171A (en) * | 2022-04-13 | 2022-08-02 | 福建省凯安包装科技有限公司 | Environment-friendly printing process of polyethylene packaging material |
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Application publication date: 20201127 |