CN113059879A - Extinction polyethylene film suitable for gravure printing and preparation process thereof - Google Patents
Extinction polyethylene film suitable for gravure printing and preparation process thereof Download PDFInfo
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- CN113059879A CN113059879A CN202110396248.4A CN202110396248A CN113059879A CN 113059879 A CN113059879 A CN 113059879A CN 202110396248 A CN202110396248 A CN 202110396248A CN 113059879 A CN113059879 A CN 113059879A
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Images
Classifications
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- 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
- 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
- B29C48/002—Combinations of extrusion moulding with other shaping operations combined with surface shaping
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- 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
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
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- 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
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
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- 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
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/10—Surface shaping of articles, e.g. embossing; Apparatus therefor by electric discharge treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
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Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
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Abstract
The invention relates to a delustering polyethylene film suitable for gravure printing and a preparation process thereof, belonging to the technical field of packaging, and the delustering polyethylene film comprises an outer layer, a middle layer and an inner layer which are sequentially connected and are prepared by a gravure printing process, wherein the outer layer comprises 97.5 parts by mass of low-density polyethylene, 1.5 parts by mass of processing aid and 1 part by mass of slipping agent; the intermediate layer includes 100 parts by mass of low density polyethylene; the inner layer comprises 98.5 parts by mass of low-density polyethylene, 1 part by mass of processing aid and 0.5 part by mass of slipping agent. The inner layer of the invention uses the resin with the brand number FB2230, which not only effectively improves the surface glossiness, but also achieves the extinction effect; the resin is reinforced polyethylene resin, has higher heat-sealing strength, is easier to make bags, and does not cause the problems of knife sticking, silk rising and the like.
Description
Technical Field
The invention relates to the field of sanitary material packaging, in particular to a delustering polyethylene film suitable for gravure printing and a preparation process thereof.
Background
In the sanitary packaging industry, various packaging materials and different printed patterns attract wide consumers. However, with the change of the consumption concept of people, the pursuit of the quality of life is improved, and the requirements on the packaging grade are changed.
The method changes the single-layer inner printing structure of the original sanitary material package into the composite film structure, and the key point of the method is to attach importance to the safety of consumers for paying attention to the safety of content products of production enterprises. The packaging structure has qualitative leap, so the packaging structure is widely favored by consumers. Brand awareness, reputation and reputation of manufacturing enterprises are therefore also of interest.
In the printing industry, the gravure printing of polyethylene is a relatively headache printing material for various large enterprises, and compared with common double-pull polyester, double-pull nylon and double-pull polypropylene printing films, the gravure printing of polyethylene has a relatively high difficulty coefficient of polyethylene printing, poor color register precision and other printing quality problems, which troubles the essence in the industry.
The existing common extinction film is PE with an extinction effect on the surface formed by mixing and processing a plurality of resins in proportion, but the extinction PE film has a rough film surface (mainly measured by surface glossiness and haze indexes), and some of the extinction PE films even generate chapped lines to influence the physical properties, printing color register and the like of the PE film.
Disclosure of Invention
In order to solve the technical problems, the invention provides a delustering polyethylene film suitable for gravure printing and a preparation process thereof.
In order to realize one of the purposes of the invention, the invention adopts the following technical scheme:
the film comprises an outer layer, a middle layer and an inner layer which are sequentially connected and prepared by a gravure printing process, wherein the outer layer comprises 97.5 parts by mass of low-density polyethylene, 1.5 parts by mass of processing aid and 1 part by mass of slipping agent; the intermediate layer includes 100 parts by mass of low density polyethylene; the inner layer comprises 98.5 parts by mass of low-density polyethylene, 1 part by mass of processing aid and 0.5 part by mass of slipping agent.
Preferably, the low density polyethylene of the outer layer comprises 72.5 parts by mass of 1002AY available from exxon and 25 parts by mass of FT5230 available from nordic chemical; the low density polyethylene of the middle layer comprises 75 parts by mass of 1002AY produced by Exon company and 25 parts by mass of FT5230 produced by northern Europe chemical industry company; the low density polyethylene of the inner layer is available under the trademark FB2230 from Nordic chemical company.
Preferably, the processing aid of the outer layer and the processing aid of the inner layer are both 10991-K produced by color matching company, and the slipping agent of the outer layer and the slipping agent of the inner layer are both ESQ-44 produced by Mitsui chemical company.
Preferably, the layer thickness ratio of the outer layer, the intermediate layer and the inner layer is 2: 3: 2.
Another object of the present invention is to provide: a preparation process of a delustering polyethylene film suitable for gravure printing comprises the following steps:
s1, weighing the components in parts by mass according to the formula composition of the outer layer, the middle layer and the inner layer in the film, and putting the components into corresponding 3 extruders for high-temperature extrusion to form a melt.
And S2, sequentially passing the melt obtained in the step S1 through a filter screen and a die head distributor to form an annular bubble cylinder film, cooling and shaping the bubble cylinder film in an air cooling device, and forming a three-layer co-extruded PE film under the action of a traction device, a thickness measuring system, a corona treatment system, a trimming and a winding device.
Preferably, the screw diameters of the 3 extruders in the step S1 are 90mm, 100mm and 90mm, respectively, and the die diameters are all 500 mm.
Preferably, the temperatures of the outer layer extruder in step S1 are respectively: 50 ℃, 202 ℃, 205 ℃ and 205 ℃; the temperatures of the middle layer extruder were: 55 deg.C, 200 deg.C; the temperature of the inner layer extruder is respectively as follows: 55 deg.C, 200 deg.C, 205 deg.C, 210 deg.C.
Preferably, the extrusion capacity of the extruder in the step S1 is 480 +/-20 kg/h; the traction speed is 45 +/-5 m/min; the traction tension is 100 +/-10N; the tension of the contact roller is 40 +/-10N; the winding tension is 45 +/-10N.
Preferably, the filter screens in step S2 are 100 mesh/150 mesh/100 mesh, respectively.
Compared with the prior art, the invention has the beneficial effects that:
1) the inner layer of the invention uses the resin with the brand number FB2230, which not only effectively improves the surface glossiness, but also achieves the extinction effect; the resin is reinforced polyethylene resin, has higher heat-sealing strength, is easier to make bags, does not have the bad problems of knife sticking, silk rising and the like, greatly saves the packaging cost, reduces the economic loss, and can effectively protect the packaged contents. The invention adopts a three-layer coextrusion film-blowing method to prepare the film, can effectively improve the haze of the film, and forms a hazy and beautiful appearance by adding the extinction effect of the inner layer.
2) The metallocene linear 1002AY added in the outer layer and the middle layer is beneficial to improving the toughness of the polyethylene film and improving the softness of the material. When the composite film is used for making bags, the edge sealing strength and the printing effect of the material can be effectively improved, the outer layer of the composite film has higher surface gloss and good toughness, and a small amount of auxiliary agent can improve the appearance of the film and reduce the probability of occurrence of wire drawing, die line and the like.
3) According to the invention, the outer layer and the middle layer are added with high-pressure FT5230 resin in a certain proportion, so that the polyethylene composite film is easy to cut by a cutter in the bag making process and the phenomenon of wire drawing is avoided; the thin surface layer of the extinction polyethylene prepared by the invention can be subjected to corona treatment, so that the subsequent processing operations such as printing, compounding and the like are facilitated.
4) The invention adopts a layer thickness ratio structure of 2: 3: 2, special materials and optimization of a production process, adopts a filter screen with higher mesh number and higher processing temperature, is favorable for reducing the condition of film surface crystal points, forming good film surface appearance and being favorable for matching and processing of equipment screws, wherein the characteristics of each layer of particles enhance the appearance grade after physical packaging, broadens the application range of polyethylene products, simultaneously improves the printing adaptability of gravure printing, is used in the field of sanitary material packaging, and has unique appearance effect; meanwhile, the product has higher heat-seal strength, and the formula materials meet the food sanitation safety standard, so that the product not only can be used for sanitary packaging, but also can be widely applied to the fields of food packaging and the like.
Drawings
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a schematic flow diagram of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments, and all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the protection scope of the present invention.
Example 1
S1, weighing the components in parts by mass according to the formula composition of an outer layer, an intermediate layer and an inner layer in the film, wherein the outer layer comprises 72.5 parts by mass of 1002AY produced by Exon company, 25 parts by mass of FT5230 produced by northern Europe chemical industry, 1.5 parts by mass of processing aid and 1 part by mass of slipping agent; the middle layer comprises 75 parts by mass of 1002AY produced by Exon company and 25 parts by mass of FT5230 produced by northern Europe chemical industry company; the inner layer comprises 98.5 parts by mass of FB2230 produced by northern Europe chemical company, 1 part by mass of processing aid and 0.5 part by mass of slipping agent, and the particles of each layer are respectively put into corresponding 3 extruders to be extruded at high temperature to form a melt.
And S2, sequentially passing the melt obtained in the step S1 through a filter screen and a die head distributor to form an annular bubble cylinder film, cooling and shaping the bubble cylinder film in an air cooling device, and forming a three-layer co-extruded extinction PE film 1 under the action of a traction device, a thickness measuring system, a corona treatment system, an edge cutting device and a winding device.
The processing aid of the outer layer and the processing aid of the inner layer are both 10991-K produced by color matching company, and the slipping agent of the outer layer and the slipping agent of the inner layer are both ESQ-4 produced by Mitsui chemical company.
Comparative example 1
S1, weighing the components in parts by mass according to the formula composition of an outer layer, an intermediate layer and an inner layer in the film, wherein the outer layer comprises 72.5 parts by mass of 1002AY produced by Exon company, 25 parts by mass of FT5230 produced by northern Europe chemical industry, 1.5 parts by mass of processing aid and 1 part by mass of slipping agent; the middle layer comprises 75 parts by mass of 1002AY produced by Exon company and 25 parts by mass of FT5230 produced by northern Europe chemical industry company; the inner layer comprises 80 parts by mass of FB2230 produced by northern Europe chemical industry and 20 parts by mass of 1002AY produced by Exxon, and the particles of each layer are respectively put into corresponding 3 extruders to be extruded at high temperature to form a melt.
And S2, sequentially passing the melt obtained in the step S1 through a filter screen and a die head distributor to form an annular bubble cylinder film, cooling and shaping the bubble cylinder film in an air cooling device, and forming a three-layer co-extruded extinction film 1 under the action of a traction device, a thickness measuring system, a corona treatment system, an edge cutting device and a winding device.
The processing aid of the outer layer of processing aid is 10991-K produced by the color matching company, and the slipping agent of the outer layer of slipping agent is ESQ-4 produced by the Mitsui chemical company.
Comparative example 2
S1, weighing the components in parts by mass according to the formula composition of an outer layer, an intermediate layer and an inner layer in the film, wherein the outer layer comprises 72.5 parts by mass of 1002AY produced by Exon company, 25 parts by mass of FT5230 produced by northern Europe chemical industry, 1.5 parts by mass of processing aid and 1 part by mass of slipping agent; the middle layer comprises 75 parts by mass of 1002AY produced by Exon company and 25 parts by mass of FT5230 produced by northern Europe chemical industry company; the inner layer comprises 60 parts by mass of FB2230 produced by northern Europe chemical industry and 40 parts by mass of 1002AY produced by Exxon, and the particles of each layer are respectively put into corresponding 3 extruders to be extruded at high temperature to form a melt.
And S2, sequentially passing the melt obtained in the step S1 through a filter screen and a die head distributor to form an annular bubble cylinder film, cooling and shaping the bubble cylinder film in an air cooling device, and forming a three-layer co-extruded extinction film 2 under the action of a traction device, a thickness measuring system, a corona treatment system, an edge cutting device and a winding device.
The processing aid of the outer layer of processing aid is 10991-K produced by the color matching company, and the slipping agent of the outer layer of slipping agent is ESQ-4 produced by the Mitsui chemical company.
Comparative example 3
S1, weighing the components in parts by mass according to the formula composition of an outer layer, an intermediate layer and an inner layer in the film, wherein the outer layer comprises 72.5 parts by mass of 1002AY produced by Exon company, 25 parts by mass of FT5230 produced by northern Europe chemical industry, 1.5 parts by mass of processing aid and 1 part by mass of slipping agent; the middle layer comprises 75 parts by mass of 1002AY produced by Exon company and 25 parts by mass of FT5230 produced by northern Europe chemical industry company; the inner layer comprises 25 parts by mass of FT5230 produced by northern Europe chemical industry and 75 parts by mass of 1002AY produced by Exxon, and the particles of each layer are respectively put into corresponding 3 extruders to be extruded at high temperature to form a melt.
And S2, sequentially passing the melt obtained in the step S1 through a filter screen and a die head distributor to form an annular bubble cylinder film, cooling and shaping the bubble cylinder film in an air cooling device, and forming a three-layer co-extruded PE film 3 under the action of a traction device, a thickness measuring system, a corona treatment system, a trimming and winding device.
The processing aid of the outer layer of processing aid is 10991-K produced by the color matching company, and the slipping agent of the outer layer of slipping agent is ESQ-4 produced by the Mitsui chemical company.
The matte PE film 1 prepared in example 1 and the PE films 1 to 3 prepared in comparative examples 1 to 3 were respectively subjected to physical property tests, and the results were as shown in the following table 1:
TABLE 1
As can be seen from table 1 above, the matte PE film 1 prepared in example 1 has a surface gloss of 18 and a haze index of 65, which is greater than 60; the light transmittance was 89.5, and the surface gloss of the PE films 1 to 3 prepared in comparative examples 1 to 3 were 30, 40, and 50, respectively; the haze indexes are respectively 50, 40 and 30, and are all less than 60; the light transmittance is 91, 91.5 and 92 respectively; the extinction effect of the PE film is shown to be increased along with the increase of the proportion of the resin with the inner layer of the grade of FB2230, the haze of the prepared film is also increased, and the light transmittance is reduced; the tensile strength of the film is reduced along with the increase of the proportion of the linear resin with the inner layer number of 1002AY, but the elongation at break of the film is increased, which shows that the film is easier to be stretched along with the increase of the linear resin, namely, the printing adaptability of the film is improved along with the increase of the proportion of the FB2230 resin. The extinction PE film prepared by the invention has the advantages of fine film surface, good PE film appearance, less impurities such as crystal points, coke blocks and the like, better surface extinction effect, good physical performance index and suitability for medium-high speed gravure printing.
Finally, it should be noted that while the above illustrates and describes embodiments of the present invention, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made herein without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims (9)
1. The extinction polyethylene film suitable for gravure printing is characterized by comprising an outer layer, a middle layer and an inner layer which are prepared by a gravure printing process and connected in sequence, wherein the outer layer comprises 97.5 parts by mass of low-density polyethylene, 1.5 parts by mass of processing aid and 1 part by mass of slipping agent; the intermediate layer includes 100 parts by mass of low density polyethylene; the inner layer comprises 98.5 parts by mass of low-density polyethylene, 1 part by mass of processing aid and 0.5 part by mass of slipping agent.
2. A matted polyethylene film suitable for gravure printing according to claim 2, wherein said outer layer of low density polyethylene comprises 72.5 parts by mass of a brand of 1002AY manufactured by eksen and 25 parts by mass of a brand of FT5230 manufactured by nordic chemical company; the low-density polyethylene of the middle layer comprises 75 parts by mass of 1002AY produced by Exon company and 25 parts by mass of FT5230 produced by northern Europe chemical industry company; the grade of the low-density polyethylene of the inner layer is FB2230 produced by northern Europe chemical industry Co.
3. A matted polyethylene film suitable for gravure printing according to claim 1, wherein said outer layer processing aid and said inner layer processing aid are each available under the trade name of 10991-K from natura chemical company, and said outer layer slip agent and said inner layer slip agent are each available under the trade name of ESQ-4 from mitsui chemical company.
4. A matted polyethylene film suitable for gravure printing according to claim 1, wherein the layer thickness ratio of said outer layer, intermediate layer and inner layer is 2: 3: 2.
5. A process for preparing a delustered polyethylene film suitable for gravure printing according to any one of claims 1 to 4, which comprises the following steps:
s1, weighing the components in parts by mass according to the formula composition of the outer layer, the middle layer and the inner layer in the film, and putting the components into corresponding 3 extruders for high-temperature extrusion to form a melt.
And S2, sequentially passing the melt obtained in the step S1 through a filter screen and a die head distributor to form an annular bubble cylinder film, cooling and shaping the bubble cylinder film in an air cooling device, and forming a three-layer co-extruded PE film under the action of a traction device, a thickness measuring system, a corona treatment system, a trimming and a winding device.
6. The process of claim 5, wherein the screw diameters of the 3 extruders in the step S1 are 90mm, 100mm and 90mm, and the die diameters are 500 mm.
7. The process for preparing a delustered polyethylene film suitable for gravure printing as claimed in claim 5, wherein the temperatures of the outer layer extruder in the step S1 are respectively as follows: 50 ℃, 202 ℃, 205 ℃ and 205 ℃; the temperatures of the middle layer extruder are respectively as follows: 55 deg.C, 200 deg.C; the temperature of the inner layer extruder is respectively as follows: 55 deg.C, 200 deg.C, 205 deg.C, 210 deg.C.
8. The process for preparing a matted polyethylene film suitable for gravure printing according to claim 5, wherein the extrusion capacity of the extruder in the step S1 is 480 ± 20 kg/h; the traction speed is 45 +/-5 m/min; the traction tension is 100 +/-10N; the tension of the contact roller is 40 +/-10N; the winding tension is 45 +/-10N.
9. The process for preparing a delustered polyethylene film suitable for gravure printing as claimed in claim 5, wherein the filter mesh in the step S2 is 100 mesh/150 mesh/100 mesh respectively.
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