CN113059778A - Treatment process and equipment structure for replacing printing white ink with squeezed emulsion white for extrusion - Google Patents
Treatment process and equipment structure for replacing printing white ink with squeezed emulsion white for extrusion Download PDFInfo
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- CN113059778A CN113059778A CN202110322580.6A CN202110322580A CN113059778A CN 113059778 A CN113059778 A CN 113059778A CN 202110322580 A CN202110322580 A CN 202110322580A CN 113059778 A CN113059778 A CN 113059778A
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- 238000007639 printing Methods 0.000 title claims abstract description 64
- 238000001125 extrusion Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000000839 emulsion Substances 0.000 title description 8
- 239000002245 particle Substances 0.000 claims abstract description 70
- 229920006280 packaging film Polymers 0.000 claims abstract description 12
- 239000012785 packaging film Substances 0.000 claims abstract description 12
- 230000000694 effects Effects 0.000 claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 7
- 238000007689 inspection Methods 0.000 claims abstract description 5
- 239000011022 opal Substances 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 76
- 239000002131 composite material Substances 0.000 claims description 71
- 239000011347 resin Substances 0.000 claims description 62
- 229920005989 resin Polymers 0.000 claims description 62
- 239000011127 biaxially oriented polypropylene Substances 0.000 claims description 50
- 229920006378 biaxially oriented polypropylene Polymers 0.000 claims description 50
- 238000013329 compounding Methods 0.000 claims description 50
- 239000004698 Polyethylene Substances 0.000 claims description 43
- 239000000853 adhesive Substances 0.000 claims description 27
- 230000001070 adhesive effect Effects 0.000 claims description 27
- 238000010030 laminating Methods 0.000 claims description 25
- 239000012943 hotmelt Substances 0.000 claims description 23
- 239000003795 chemical substances by application Substances 0.000 claims description 22
- 239000011248 coating agent Substances 0.000 claims description 22
- 238000000576 coating method Methods 0.000 claims description 22
- 238000002844 melting Methods 0.000 claims description 20
- 230000008018 melting Effects 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 19
- 238000005520 cutting process Methods 0.000 claims description 17
- 238000001816 cooling Methods 0.000 claims description 15
- 230000006835 compression Effects 0.000 claims description 14
- 238000007906 compression Methods 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 12
- 239000000843 powder Substances 0.000 claims description 12
- 238000005507 spraying Methods 0.000 claims description 12
- 238000004804 winding Methods 0.000 claims description 12
- 239000012528 membrane Substances 0.000 claims description 8
- 238000007493 shaping process Methods 0.000 claims description 8
- 239000000758 substrate Substances 0.000 claims description 8
- -1 polyethylene Polymers 0.000 claims description 7
- 229920000573 polyethylene Polymers 0.000 claims description 7
- 238000007766 curtain coating Methods 0.000 claims description 6
- 229920000092 linear low density polyethylene Polymers 0.000 claims description 6
- 239000004707 linear low-density polyethylene Substances 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 238000007646 gravure printing Methods 0.000 claims description 5
- 239000000741 silica gel Substances 0.000 claims description 5
- 229910002027 silica gel Inorganic materials 0.000 claims description 5
- KEQXNNJHMWSZHK-UHFFFAOYSA-L 1,3,2,4$l^{2}-dioxathiaplumbetane 2,2-dioxide Chemical compound [Pb+2].[O-]S([O-])(=O)=O KEQXNNJHMWSZHK-UHFFFAOYSA-L 0.000 claims description 4
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 claims description 4
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 4
- 239000003086 colorant Substances 0.000 claims description 4
- 239000012778 molding material Substances 0.000 claims description 4
- 238000012958 reprocessing Methods 0.000 claims description 4
- 238000005096 rolling process Methods 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
- 238000009966 trimming Methods 0.000 claims description 4
- 239000002699 waste material Substances 0.000 claims description 4
- 239000003292 glue Substances 0.000 claims description 2
- 238000012545 processing Methods 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract 1
- 239000004595 color masterbatch Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 229920001684 low density polyethylene Polymers 0.000 description 2
- 239000004702 low-density polyethylene Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 235000021355 Stearic acid Nutrition 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 125000004494 ethyl ester group Chemical group 0.000 description 1
- 229920001002 functional polymer Polymers 0.000 description 1
- 229940057995 liquid paraffin Drugs 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 235000010215 titanium dioxide Nutrition 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
Images
Classifications
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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
- B29C48/03—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
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
-
- 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
-
- 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
- B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
-
- 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
- B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
- B29C48/154—Coating solid articles, i.e. non-hollow articles
Abstract
The invention discloses a processing technology and a device structure for replacing printing white ink with squeezed opal white for squeezing, wherein the device comprises printing processing, squeezing and repeating processing, drying and repeating processing, curing processing, slitting processing and final inspection processing, and the printing and production of a packaging film are realized through the working procedures of squeezing and repeating processing and the like, so that the production efficiency is improved; in addition, in the extrusion process, the invention ensures that the extruded film has a white background color effect equivalent to the printing effect by adding 804 particles, thereby realizing that the extrusion milky PE for extrusion replaces the full-page white ink on the printing, reducing the consumption of the white ink and reducing the printing cost.
Description
Technical Field
The invention relates to the technical field of extrusion compounding in the printing and packaging industry, in particular to a treatment process and an equipment structure for replacing printing white ink with emulsion white for extrusion.
Background
At present, in the production process of printing and packaging of the packaging film, generally, the main material of the packaging film consists of a BOPP layer/an ink layer/a PE layer.
In the production process of some packaging films which need white as a base color, the color effect can be realized only by full-page white ink in a printing process, the full-page white ink needs to be filled, so that the consumed amount of the white ink is relatively large, in addition, the price of the white ink is high, the printing production cost is relatively high, in addition, in the extrusion compounding, the firm adhesion between a PE layer and a BOPP layer is relatively low, and therefore, in the extrusion compounding, measures for increasing the adhesive force are needed.
Thus, the prior art is not satisfactory.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides a treatment process and an equipment structure for replacing printing white ink with squeezed opal in a squeezing and compounding process, reducing the printing cost and improving the adhesive force of a PE layer and a BOPP layer in the squeezing and compounding process.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides a treatment process for replacing printing white ink with squeezed emulsion white for squeezing, which is implemented on the basis of equipment of a printing machine, a squeezing machine, a solvent-free compound machine, a coating mechanism, a curing chamber and a north man-machine, and comprises the following steps:
step 1) printing treatment: the BOPP film and the VMPET film are rolled and placed on a roll releasing frame of a printer, and the BOPP film and the VMPET film can be directly subjected to gravure printing by a printing device of the printer without blending ink;
step 2) extruding and repeating treatment: the extrusion composite treatment of the BOPP film and the VMPET film comprises the following steps:
step a) unfolding the substrate: taking the BOPP film in the step 1 as a first unreeling base material and the VMPET film in the step 1 as a second unreeling base material, putting the first unreeling base material and the second unreeling base material on an extruding and laminating machine, and unreeling the base materials through a first unreeling mechanism and a second unreeling mechanism of the extruding and laminating machine;
step b) hot melting of resin particles: mixing three resin particles of PE955 particles, AE particles and 804 color mother particles according to the proportion of 125:25:7.2, putting the resin particles into an extruder, and heating in a heater of the extruder to melt the resin particles into a resin hot melt film;
step c) extruding and repeating: the BOPP film base material and the VMPET film base material to be extruded enter a space between a silica gel roller and a cooling roller of an extruding and laminating machine through a drying channel, a hot-melt resin hot-melt film extruded from a die orifice of a die head of the extruding and laminating machine is coated on the surface of the base material, a PE (polyethylene) coating film is extruded between the BOPP film and the VMPET film under the action of pressure, and the extruded PE coating film is milky white after 804 particles are mixed, so that the full-page white ink effect of printing is replaced, and the BOPP film, the VMPET film and the PE coating film are extruded together to form a composite film;
step d) shaping: cooling and shaping the extruded composite film by a cooling roller of an extruding and coating machine;
step e) trimming: cutting off the waste edges of the composite film through an edge cutting assembly of an extruding and compounding machine;
step f), powder spraying: then, spraying powder to the composite film after the edge cutting through a powder spraying component of the extruding and coating machine;
step g) extrusion: extruding the powder-sprayed composite film, winding the composite film on a winding shaft paper core of an extruder, and winding the composite film to obtain an extruded composite molding material;
step 3) dry reprocessing: and c, taking the composite film obtained by compounding the BOPP film, the VMPET film and the PE film in the step c as a first base material, taking the linear low-density polyethylene film as a second base material, rolling the first base material and the second base material into the solvent-free compounding machine, unfolding the base materials through an unwinding mechanism of the solvent-free compounding machine, coating the first base material and the second base material by using a solvent-free adhesive by using the solvent-free compounding machine, conveying the first base material and the second base material coated with the solvent-free adhesive to a compounding device of the solvent-free compounding machine through a guide roller of the solvent-free compounding machine for solvent-free compounding, and obtaining the solvent-free composite film of the BOPP film, the VMPET film and the PE film.
Preferably, the treatment process further comprises:
step 4), curing treatment: putting the dried solvent-free composite membrane into a curing chamber for curing, wherein the curing temperature is 40-45 ℃, and the curing time is 24-30 h;
step 5), slitting treatment: cutting the cured solvent-free composite film into a composite packaging film with a required specification by a north man-machine;
step 6), final inspection treatment: and sampling and detecting the cut composite packaging film.
Preferably, the printer in step 1 is a 14-color double-release double-receive printer "FCD-14" imported from japan, the printer performs printing using 6 passes of colors, the printing speed of the printer is 220m/min to 250m/min, the film thickness of the BOPP film is 19 μm, and the film thickness of the VMPET film is 12 μm.
Preferably, the model of the extruder in the step a is EXC1350-90ZS-F, and the unwinding tension of the first unwinding mechanism and the unwinding tension of the second unwinding mechanism are both 90N.
Preferably, a PE lamination film is extruded between the printed BOPP film and the VMPET film in the step c, and the thickness of the PE lamination film is 12 μm.
Preferably, the solvent-free adhesive in the step 3 comprises a main agent and a curing agent, the grade of the main agent is FP133B, the grade of the curing agent is FP412S, the mass ratio of the main agent to the curing agent is 100:60, and the coating amount of the solvent-free adhesive is 1.7g/m2。
The invention also provides another equipment structure for extruding milky white instead of printing white ink, which comprises an extruding machine, wherein the extruding machine comprises an extruding device, the extruding device comprises a feeding component, a heating component and a screw rod component, the screw rod component is arranged between the feeding component and the heating component, the feeding component conveys resin particles to the screw rod component, and the screw rod component conveys the resin particles into the heating component for heating and hot melting.
Preferably, the feeding assembly comprises a hopper and a feeding channel, the hopper is communicated with the feeding channel, and the resin particles are placed in the hopper and are fed to the screw assembly through the feeding channel.
Preferably, the screw assembly comprises a feeding part, a compression part and a melting part, the compression part is arranged between the feeding part and the melting part, the resin particles are fed into the compression part by the feeding part, and the compression part compresses the resin particles and feeds the resin particles to the melting part for heating and melting.
Preferably, the extruder comprises a die head, the die head is connected with the screw assembly, the die orifice is arranged at the opening of the die head, and the hot-melt resin hot-melt film extruded by the screw assembly flows out of the die orifice of the die head.
Compared with the prior art, the scheme of the invention at least comprises the following beneficial effects:
(1) in the extrusion process, the BOPP film substrate and the VMPET film substrate to be extruded enter a space between a silica gel roller and a cooling roller of an extruder through a drying tunnel, the hot-melt resin hot-melt film extruded from a die orifice of a die head of the extruder is coated on the surface of the substrate, the PE laminating film is extruded between the BOPP film and the VMPET film under the action of pressure, 804 particles are added, so that the extruded PE film has a white background color effect equivalent to the printing effect, and the white background color film is attached to printing films such as the BOPP film and the like by virtue of intermolecular force, so that the full-page white ink is printed instead of the extrusion milky PE, the consumption of the white ink is reduced, and the printing cost is reduced;
(2) the composite film is characterized in that a BOPP film, a VMPET film and a PE film are compounded together to form a composite film as a first base material, a linear low-density polyethylene film is used as a second base material, the first base material and the second base material are coated by using a solvent-free adhesive, the first base material and the second base material coated with the solvent-free adhesive are conveyed to a compounding device of the solvent-free compounding machine through a guide roller of the solvent-free compounding machine to be compounded in a solvent-free manner, and the adhesive force between the polyethylene film and the BOPP film and other base materials is enhanced by adding the solvent-free adhesive, so that the adhesive strength of an extruded composite material is increased, the quality of an extrusion compounding process is better ensured, and the quality of product production is ensured.
Drawings
FIG. 1 is a process flow chart of the present invention for replacing printing white ink with emulsion white extrusion;
FIG. 2 is a schematic view of an extruding device in the structure of the device for extruding and using emulsion white instead of printing white ink.
In the figure, an extrusion apparatus 1, a feed unit 11, a hopper 111, a feed passage 112, a heating unit 12, a screw unit 13, a feed section 131, a compression section 132, a melting section 133, and a die 14 are shown.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a treatment process for replacing printing white ink with squeezed emulsion white for squeezing, which is realized on the basis of equipment of a printing machine, a squeezing machine, a solvent-free compound machine, a coating mechanism, a curing chamber and a north man-machine.
As shown in fig. 1, it is a flow chart about the treatment process of the present invention, and the treatment process comprises the following steps:
step 1) printing treatment: the BOPP film and the VMPET film are rolled and placed on a roll releasing frame of a printer, and the BOPP film and the VMPET film can be directly subjected to gravure printing by a printing device of the printer without blending ink;
step 2) extruding and repeating treatment: the extrusion composite treatment of the BOPP film and the VMPET film comprises the following steps:
step a) unfolding the substrate: taking the BOPP film in the step 1 as a first unreeling base material and the VMPET film in the step 1 as a second unreeling base material, putting the first unreeling base material and the second unreeling base material on an extruding and laminating machine, and unreeling the base materials through a first unreeling mechanism and a second unreeling mechanism of the extruding and laminating machine;
step b) hot melting of resin particles: mixing three resin particles of PE955 particles, AE particles and 804 color mother particles according to the proportion of 125:25:7.2, putting the resin particles into an extruder, and heating in a heater of the extruder to melt the resin particles into a resin hot melt film;
step c) extruding and repeating: the BOPP film base material and the VMPET film base material to be extruded enter a space between a silica gel roller and a cooling roller of an extruding and laminating machine through a drying channel, a hot-melt resin hot-melt film extruded from a die orifice of a die head 14 of the extruding and laminating machine is coated on the surface of the base material, a PE (polyethylene) drench film is extruded between the BOPP film and the VMPET film under the action of pressure, and the extruded PE drench film is milky white after 804 particles are mixed, so that the full-page white ink effect of printing is replaced, and the BOPP film, the VMPET film and the PE drench film are extruded together to form a composite film;
step d) shaping: cooling and shaping the extruded composite film by a cooling roller of an extruding and coating machine;
step e) trimming: cutting off the waste edges of the composite film through an edge cutting assembly of an extruding and compounding machine;
step f), powder spraying: then, spraying powder to the composite film after the edge cutting through a powder spraying component of the extruding and coating machine;
step g) extrusion: extruding the powder-sprayed composite film, winding the composite film on a winding shaft paper core of an extruder, and winding the composite film to obtain an extruded composite molding material;
step 3) dry reprocessing: and c, taking the composite film obtained by compounding the BOPP film, the VMPET film and the PE film in the step c as a first base material, taking the linear low-density polyethylene film as a second base material, rolling the first base material and the second base material into the solvent-free compounding machine, unfolding the base materials through an unwinding mechanism of the solvent-free compounding machine, coating the first base material and the second base material by using a solvent-free adhesive by using the solvent-free compounding machine, conveying the first base material and the second base material coated with the solvent-free adhesive to a compounding device of the solvent-free compounding machine through a guide roller of the solvent-free compounding machine for solvent-free compounding, and obtaining the solvent-free composite film of the BOPP film, the VMPET film and the PE film.
The treatment process further comprises:
step 4), curing treatment: putting the dried solvent-free composite membrane into a curing chamber for curing, wherein the curing temperature is controlled to be 40-45 ℃, and the curing time is 24-30 h;
step 5), slitting treatment: cutting the cured solvent-free composite film into a composite packaging film with a required specification by a north man-machine;
step 6), final inspection treatment: and sampling and detecting the cut composite packaging film.
In the embodiment of the present invention, the type of the printer used in step 1 is a 14-color double-release double-receive printer "FCD-14" imported from japan, the printing mode of the printer is gravure printing, the printer performs printing with 6 passes of colors, which are black, purple, magenta, blue, red, and yellow, respectively, in the printing process, and the types, ratios, and viscosities of the 6 passes of colors are shown in table 1 below:
TABLE 1
Compared with the existing printing process, the method reduces the step of printing after the last full-white ink is applied, and greatly saves the production and manufacturing cost.
The type of the extruder related in the step a is EXC1350-90ZS-F, wherein the unwinding tension of the first unwinding mechanism and the unwinding tension of the second unwinding mechanism are both 90N.
In the embodiment of the present invention, there are two resin particle ratios in step b:
the first is that the resin A is PE955 particles: 804 color master batch is 100: 11.2;
the second one is that the resin mixture B is PE955 particles: AE particles: 804 color mother particle 125: 25:7.2.
Regarding the processing characteristics of the resin particles:
(1) PE955 particles
The resin temperature range of the PE955 particles is: 300-320 ℃;
the melt index is 7.5g/10min, and the density is 0.918g/cm3
The air gap adjustment range is as follows: 110-150mm, heat sealing temperature: 105 ℃ C
The PE955 particles of the present invention have excellent sealability as a heat seal layer and are mainly used for a composite film.
(2)804 color master batch
The 804-color mother particles are milk white, and the content of titanium white is 30 percent; the 804 color master batch dispersing agent comprises 5% of low molecular weight polyethylene wax, oxidized polyethylene, stearic acid, liquid paraffin and the like, and has a pH value of 3.5 (containing 2% of water solution);
fixed quantity: 95 percent
The carrier resin is: LDPE (Low-Density polyethylene)
(3) AE particles
The melt index of the AE particles was: 6g/10 min;
migration resistance: grade 5;
AE particles are functional polymers and are mainly used to improve the peel strength of extruded composite films.
According to the invention, 804-color mother particles are added in the extruding and re-extruding process, so that the extruded PE laminating film has a white background color effect equivalent to the printing effect, and is attached to the printing film by virtue of intermolecular force, thus the milky-white PE laminating film is extruded repeatedly to replace full-page white ink on printing, the amount of the white ink is reduced, and the printing cost is reduced.
Specifically, a PE (polyethylene) laminating film is extruded between the printed BOPP film and the VMPET film, and the thickness of the PE laminating film is 12 mu m.
Specifically, the glue model of the solvent-free adhesive used in step 3 is YH450, and the ratio of the solvent-free adhesive is YH 4501: ethyl ester 20: 50, the solvent-free adhesive comprises a main agent and a curing agent, wherein the main agent is FP133B, the curing agent is FP412S, the mass ratio of the main agent to the curing agent is 100:60, and the coating amount of the solvent-free adhesive is 1.7g/m in the coating of a first base material and a linear low-density polyethylene film which are compounded by a BOPP film, a VMPET film and a PE laminating film2。
When the invention is concretely implemented, the solvent-free composite membrane after the drying and re-processing is hung in the curing chamber for curing through the material rack hanging of the curing chamber, and the solvent-free composite membrane is placed in the curing chamber with a certain temperature and is maintained for more than 24 hours, which is a necessary procedure, and the purpose is to ensure that a main agent of the solvent-free adhesive and a curing agent generate chemical reaction, so that the molecular weight is multiplied, and a reticular cross-linked structure is generated, thereby ensuring that the composite membrane has higher composite fastness, better heat resistance and stability of resisting medium erosion.
Specifically, the cured solvent-free composite membrane is cut into the specification of 400mm × 802m by the north man machine.
In embodying the present invention, the resin hot-melt film extruded through the die orifice of the die 14 of the extruder can be coated on the surface of the substrate, wherein the temperature control of the extruded resin hot-melt film with respect to the die 14 is specifically shown in the following table 2:
TABLE 2
As shown in fig. 2, the present invention further provides an apparatus structure for replacing printing white ink with squeezed emulsion, the apparatus structure includes a squeezing machine, the squeezing machine includes an extruding device 1, the extruding device 1 includes a feeding component 11, a heating component 12, and a screw component 13, the screw component 13 is disposed between the feeding component 11 and the heating component 12, resin particles are fed to the screw component 13 through the feeding component 11, and the resin particles are conveyed into the heating component 12 by the screw component 13 to be heated and melted, so as to form the apparatus structure.
Specifically, the feeding assembly 11 includes a hopper 111 and a feeding passage 112, the hopper 111 communicates with the feeding passage 112, and the resin pellets are placed in the hopper 111 and fed to the screw assembly 13 through the feeding passage 112.
In particular, the heating assembly 12 includes a heater.
The screw assembly 13 comprises a first extrusion screw, a second extrusion screw and a third extrusion screw, wherein the diameters of the first extrusion screw and the second extrusion screw are both 100mm, the length-diameter ratio is 32:1, the diameter of the third extrusion screw is 50mm, the length-diameter ratio is 28:1, the screw assembly 13 comprises a feeding part 131, a compression part 132 and a melting part 133, the compression part 132 is arranged between the feeding part 131 and the melting part 133, and a cylinder is formed inside the screw assembly 13.
Regarding the principle of extrusion of the screw assembly 13: the screw assembly 13 is a single-screw type screw having a mixing zone, resin particles are fed from a feed portion 131, and the feed portion 131 has a deeper groove to feed more resin particles forward, so that the barrel temperature of the screw assembly 13 is not set too high, and the resin particles are prevented from adhering to the barrel and clogging the feed portion 131 of the screw assembly 13; the resin particles enter the compression part 132, the length of the screw of the compression part 132 is designed to be longer, which is beneficial to reducing the energy loss in the extrusion process, the compression part 132 compresses the resin particles and sends the resin particles to the melting part 133, the resin particles start to be heated and melted at the melting part 133 and finally enter the homogenizing part of the screw assembly 13, the homogenizing part is arranged behind the melting part 133, the screw groove of the section of the homogenizing part is shallower, the head of the screw assembly 13 rotates continuously, the resin melt is blocked at the cross head to form back pressure, the pressure is higher, the curing degree is higher, the mixing degree is higher, meanwhile, the resin melt flows back, and the mixing and stirring are carried out again, so that the extruded resin hot melt film meets the processing requirements.
The extruder comprises a die head 14, wherein the die head 14 is connected with a screw assembly 13, the die orifice is arranged at the opening of the die head 14, and a hot-melt resin hot-melt film extruded by the screw assembly 13 flows out of the die orifice of the die head 14.
Example 1: the treatment process for replacing printing white ink by milking white in the invention comprises the following specific steps:
step 1) printing treatment: the BOPP film and the VMPET film are coiled and placed on a coiling frame of a printer, the BOPP film and the VMPET film can be directly subjected to gravure printing by a printing device of the printer without blending ink, and the printing speed of the printer is 240 m/min;
step 2) extruding and repeating treatment: the extrusion composite treatment of the BOPP film and the VMPET film comprises the following steps:
step a) unfolding the substrate: taking the BOPP film in the step 1 as a first unreeling base material and the VMPET film in the step 1 as a second unreeling base material, putting the first unreeling base material and the second unreeling base material on an extruding and laminating machine, and unreeling the base materials through a first unreeling mechanism and a second unreeling mechanism of the extruding and laminating machine;
step b) hot melting of resin particles: mixing three resin particles of PE955 particles, AE particles and 804 color mother particles according to a ratio of 125:25:7.2, feeding the resin particles into an extruder from a hopper 111, and heating the resin particles in a heater of the extruder to melt the resin particles into a resin hot melt film;
step c) extruding and repeating: the BOPP film base material and the VMPET film base material to be extruded enter a space between a silica gel roller and a cooling roller of an extruding and laminating machine through a drying tunnel, wherein the cooling temperature of the cooling roller is 20-30 ℃, meanwhile, a hot-melt resin hot-melt film extruded from a die orifice of a die head 14 of the extruding and laminating machine is coated on the surface of the base material, meanwhile, a PE curtain coating film is extruded between the BOPP film and the VMPET film under the action of pressure, the pressure range is 0.3Mpa-04Mpa, after 804 particles are mixed, the extruded PE curtain coating film is enabled to present milky white color, so that the full-page white ink effect of printing is replaced, and the BOPP film, the VMPET film and the PE curtain coating film are extruded together to form a composite film;
step d) shaping: cooling and shaping the extruded composite film by a cooling roller of an extruding and coating machine;
step e) trimming: cutting off the waste edges of the composite film through an edge cutting assembly of an extruding and compounding machine;
step f), powder spraying: then, spraying powder to the composite film after the edge cutting through a powder spraying component of the extruding and coating machine;
step g) extrusion: extruding the powder-sprayed composite film, winding the composite film on a winding shaft paper core of an extruder, and winding the composite film to obtain an extruded composite molding material;
step 3) dry reprocessing: taking the composite film obtained by compounding the BOPP film, the VMPET film and the PE laminating film in the step c as a first base material, taking the linear low-density polyethylene film as a second base material, rolling the first base material and the second base material into a solvent-free compounding machine, unfolding the base materials through an unwinding mechanism of the solvent-free compounding machine, coating the first base material and the second base material by using a solvent-free adhesive by the solvent-free compounding machine, conveying the first base material and the second base material coated with the solvent-free adhesive to a compounding device of the solvent-free compounding machine through a guide roller of the solvent-free compounding machine for solvent-free compounding to obtain the solvent-free composite film of the BOPP film, the VMPET film and the PE laminating film, adding the solvent-free adhesive and compounding by using the solvent-free adhesive, wherein the compounding speed of the solvent-free compounding machine is 300M/min, and the surface tension of the solvent-free composite film can be enhanced without carrying out corona during, the peeling strength between layers is stronger, the steps are simplified, the cost is saved, and the labor intensity is reduced.
Step 4), curing treatment: putting the dried solvent-free composite membrane into a curing chamber for curing, wherein the curing temperature is controlled at 40 ℃, and the curing time is 24 hours;
step 5), slitting treatment: cutting the cured solvent-free composite film into a composite packaging film with a required specification by a north man machine, wherein the cutting speed of the north man machine is 250-260M/min;
step 6), final inspection treatment: and sampling and detecting the cut composite packaging film.
The present invention has been described in detail, and it should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Claims (10)
1. A treatment process for replacing printing white ink by squeezed opal for extrusion is characterized in that: the treatment process is implemented on the basis of equipment of a printing machine, an extruding and re-compounding machine, a solvent-free compounding machine, a coating mechanism, a curing chamber and a north man-machine, and comprises the following steps:
step 1) printing treatment: the BOPP film and the VMPET film are rolled and placed on a roll releasing frame of a printer, and the BOPP film and the VMPET film can be directly subjected to gravure printing by a printing device of the printer without blending ink;
step 2) extruding and repeating treatment: the extrusion composite treatment of the BOPP film and the VMPET film comprises the following steps:
step a) unfolding the substrate: taking the BOPP film in the step 1 as a first unreeling base material and the VMPET film in the step 1 as a second unreeling base material, putting the first unreeling base material and the second unreeling base material on an extruding and laminating machine, and unreeling the base materials through a first unreeling mechanism and a second unreeling mechanism of the extruding and laminating machine;
step b) hot melting of resin particles: mixing three resin particles of PE955 particles, AE particles and 804 color mother particles according to the proportion of 125:25:7.2, putting the resin particles into an extruder, and heating in a heater of the extruder to melt the resin particles into a resin hot melt film;
step c) extruding and repeating: the BOPP film and the VMPET film to be extruded enter a space between a silica gel roller and a cooling roller of an extruder through a drying tunnel, the hot-melt resin hot-melt film extruded from a die orifice of a die head of the extruder is coated on the surface of a base material, the PE curtain coating film is extruded between the BOPP film and the VMPET film under the action of pressure, and the extruded PE curtain coating film is milky white after 804 particles are mixed, so that the full-page white ink effect of printing is replaced, and the BOPP film, the VMPET film and the PE curtain coating film are extruded together to form a composite film;
step d) shaping: cooling and shaping the extruded composite film by a cooling roller of an extruding and coating machine;
step e) trimming: cutting off the waste edges of the composite film through an edge cutting assembly of an extruding and compounding machine;
step f), powder spraying: then, spraying powder to the composite film after the edge cutting through a powder spraying component of the extruding and coating machine;
step g) extrusion: extruding the powder-sprayed composite film, winding the composite film on a winding shaft paper core of an extruder, and winding the composite film to obtain an extruded composite molding material;
step 3) dry reprocessing: and c, taking the composite film obtained by compounding the BOPP film, the VMPET film and the PE film in the step c as a first base material, taking the linear low-density polyethylene film as a second base material, rolling the first base material and the second base material into the solvent-free compounding machine, unfolding the base materials through an unwinding mechanism of the solvent-free compounding machine, coating the first base material and the second base material by using a solvent-free adhesive by using the solvent-free compounding machine, conveying the first base material and the second base material coated with the solvent-free adhesive to a compounding device of the solvent-free compounding machine through a guide roller of the solvent-free compounding machine for solvent-free compounding, and obtaining the solvent-free composite film of the BOPP film, the VMPET film and the PE film.
2. The process for treating milked white instead of printing white ink for extrusion as claimed in claim 1, wherein: the treatment process further comprises:
step 4), curing treatment: putting the dried solvent-free composite membrane into a curing chamber for curing, wherein the curing temperature is 40-45 ℃, and the curing time is 24-30 h;
step 5), slitting treatment: cutting the cured solvent-free composite film into a composite packaging film with a required specification by a north man-machine;
step 6), final inspection treatment: and sampling and detecting the cut composite packaging film.
3. The process for treating milked white instead of printing white ink for extrusion as claimed in claim 1, wherein: the printer in the step 1 is a 14-color double-release double-receive printer 'FCD-14' imported from Japan, the printer performs printing by using 6 colors, the printing speed of the printer is 220-250 m/min, the film thickness of the BOPP film is 19 microns, and the film thickness of the VMPET film is 12 microns.
4. The process for treating milked white instead of printing white ink for extrusion as claimed in claim 1, wherein: the type of the extruder in the step a is EXC1350-90ZS-F, and the unwinding tension of the first unwinding mechanism and the unwinding tension of the second unwinding mechanism are both 90N.
5. The process for treating milked white instead of printing white ink for extrusion as claimed in claim 1, wherein: and c, extruding and laminating a PE (polyethylene) laminating film between the printed BOPP film and the VMPET film, wherein the thickness of the PE laminating film is 12 mu m.
6. The process for treating milked white instead of printing white ink for extrusion as claimed in claim 1, wherein: the solvent-free adhesive in the step 3 comprises a main agent and a curing agent, wherein the grade of the main agent is FP133B, the grade of the curing agent is FP412S, the mass ratio of the main agent to the curing agent is 100:60, and the solvent-free adhesive is prepared by mixing the main agent and the curing agent in a ratio of 100:60The glue coating amount of the adhesive is 1.7g/m2。
7. The utility model provides an equipment structure of crowded white printing of replacing of crowded repetition, this equipment structure is including crowded machine of repeating, its characterized in that: the extruder comprises an extruding device, the extruding device comprises a feeding component, a heating component and a screw rod component, the screw rod component is arranged between the feeding component and the heating component, the feeding component conveys resin particles to the screw rod component, and the screw rod component conveys the resin particles to the heating component for heating and hot melting.
8. The apparatus structure for squeezing milk white instead of printing white ink according to claim 7, wherein: the feeding assembly comprises a hopper and a feeding channel, the hopper is communicated with the feeding channel, and the resin particles are placed in the hopper and are conveyed to the screw assembly through the feeding channel.
9. The apparatus structure for squeezing milk white instead of printing white ink according to claim 7, wherein: the screw assembly comprises a feeding part, a compression part and a melting part, wherein the compression part is arranged between the feeding part and the melting part, the resin particles are fed into the compression part by the feeding part, and the compression part compresses the resin particles and sends the resin particles to the melting part for heating and melting.
10. The apparatus structure for squeezing milk white instead of printing white ink according to claim 7, wherein: the extruder comprises a die head, the die head is connected with a screw assembly, the die orifice is arranged at the opening of the die head, and the hot-melt resin hot-melt film extruded by the screw assembly flows out from the die orifice of the die head.
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| CN202110322580.6A CN113059778A (en) | 2021-03-25 | 2021-03-25 | Treatment process and equipment structure for replacing printing white ink with squeezed emulsion white for extrusion |
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Application publication date: 20210702 |