CN111823694A - Production process of salt plastic printing flexible package - Google Patents

Production process of salt plastic printing flexible package Download PDF

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Publication number
CN111823694A
CN111823694A CN202010718351.1A CN202010718351A CN111823694A CN 111823694 A CN111823694 A CN 111823694A CN 202010718351 A CN202010718351 A CN 202010718351A CN 111823694 A CN111823694 A CN 111823694A
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China
Prior art keywords
solvent
printing
film
free adhesive
reduced
Prior art date
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Pending
Application number
CN202010718351.1A
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Chinese (zh)
Inventor
刘再伟
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China Salt Anhui Yinhua Industry And Trade Co ltd
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China Salt Anhui Yinhua Industry And Trade Co ltd
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Application filed by China Salt Anhui Yinhua Industry And Trade Co ltd filed Critical China Salt Anhui Yinhua Industry And Trade Co ltd
Priority to CN202010718351.1A priority Critical patent/CN111823694A/en
Publication of CN111823694A publication Critical patent/CN111823694A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1284—Application of adhesive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/74—Auxiliary operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/74—Auxiliary operations
    • B31B70/76—Moistening; Drying; Cooling; Heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/74—Auxiliary operations
    • B31B70/88—Printing; Embossing
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/14—Printing or colouring
    • B32B38/145—Printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/14—Multicolour printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/26—Printing on other surfaces than ordinary paper
    • B41M1/30—Printing on other surfaces than ordinary paper on organic plastics, horn or similar materials
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
    • C09J175/04—Polyurethanes
    • C09J175/06—Polyurethanes from polyesters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group

Abstract

The invention discloses a production process of a salt plastic printing flexible package, which comprises the following steps: corona treatment, printing, drying, labeling and code spraying, preparation of a solvent-free adhesive, coating of the solvent-free adhesive, bonding, curing, product inspection and slitting. The salt plastic printing flexible package produced by the invention has better performance than the original process, wherein the consumption of the printing ink and the consumption of the diluting solvent are greatly reduced and are far lower than the original process, on one hand, the discharge of a large amount of volatile organic solvents is avoided, the air pollution is reduced, and the treatment difficulty and the treatment cost of the volatile organic solvents are reduced; on the other hand, solvent volatilization on the printing production operation site is greatly reduced, the production operation site environment is improved, occupational health hazards of workers are reduced, safety risks are reduced, energy cost of drying and heating white ink is reduced, the carrying labor intensity of the workers is reduced, and production cost is reduced.

Description

Production process of salt plastic printing flexible package
Technical Field
The invention belongs to the field of flexible package production, and particularly relates to a production process for printing a flexible package by using salt plastic.
Background
At present, in domestic small salt packaging bags and plastic printing, white bottom-laying products are required, and all the products are produced by full-page printing of gravure white ink. A large amount of white ink and a diluting solvent are needed in the printing process of the process, and a large amount of volatile organic solvent is discharged due to printing and drying, so that the environment is greatly polluted, and great difficulty is brought to the treatment of the later-stage volatile organic solvent.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provide a production process for salt plastic printing flexible package, which can greatly reduce the consumption of printing ink and diluting solvent and reduce the emission of volatile organic solvent, and is safe and environment-friendly.
In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:
a production process of a salt plastic printing flexible package comprises the following steps:
s1, corona treatment: passing the plastic film through the gap between the discharging knife rest and the blade, and performing surface treatment on the plastic film by using corona generated by a high-frequency high-voltage power supply;
s2, printing: placing the plastic film after corona treatment on a printing stock, and transferring the ink of various colors except white to the inner side of the plastic film by using a printing plate with reverse pictures and texts;
s3, drying, namely drying the film printed with the various color inks in an oven, wherein the temperature of the oven is 40-70 ℃, and the air volume is 3000-4500m3/h；
S4, labeling and code spraying: labeling and spraying codes on the films printed with the various color inks by a professional labeling and code spraying rewinding platform;
s5, preparation of solvent-free adhesive: mixing the solvent-free adhesive A and the solvent-free adhesive B in proportion, and uniformly stirring to obtain a solvent-free adhesive, wherein the mass ratio of the solvent-free adhesive A to the solvent-free adhesive B is 100: 60-100: 80;
s6, coating of solvent-free adhesive: coating the mixed solvent-free adhesive on the film subjected to printing, labeling and code spraying through a five-roller gluing device of a solvent-free compound machine;
s7, bonding: bonding the film after printing, labeling, code spraying and coating with a second layer of film by using a composite roller, wherein the temperature of the composite roller is 40-50 ℃;
and S8, curing, namely after the compound processing, sending the bonded film into a curing chamber for curing reaction. The curing temperature is 40-50 ℃, and the curing time is 24-48 h;
s9, inspection: the cured film passes through a product inspection machine to remove waste products generated in the processes of printing, labeling, code spraying, bonding and the like;
s10, slitting: and (4) cutting the film with good quality inspection by a splitting machine according to the width and the quantity required by a customer.
Further, the surface tension of the film after the corona treatment in the step S1 is more than 38 dyn/cm.
Further, the preparation method of the solvent-free glue a in the step S5 includes: performing vacuum dehydration treatment on polycaprolactone polyol at the temperature of 105-115 ℃ until the water content is less than 0.05%, cooling to 40-50 ℃, putting the dehydrated polyester polyol into a reaction kettle, adding isocyanate into the polyester polyol, wherein the mass ratio of the polycaprolactone polyol to the isocyanate is 3: 2, heating to 70-80 ℃, introducing nitrogen to react for 1.5-2.5h, stopping heating, continuing introducing nitrogen to protect, and obtaining the solvent-free A glue after the temperature is reduced to room temperature; the preparation method of the solvent-free adhesive B comprises the following steps: dehydrating polytetrahydrofuran diol in vacuum at 105-115 ℃ for 1.5-2.5h, cooling to 40-50 ℃, putting the dehydrated polytetrahydrofuran diol into a reaction kettle, adding a silane coupling agent into the polytetrahydrofuran diol, wherein the mass ratio of the polytetrahydrofuran diol to the silane coupling agent is 5: and 3, introducing nitrogen at 65-75 ℃ for reaction for 1-2h, and cooling to room temperature to obtain the solvent-free adhesive B.
Further, the coating weight of the solvent-free adhesive in the step S6 is 1-2g/m2。
Further, the compounding pressure of the compounding roller in the step S7 is 0.2-0.6 MPa.
Further, the plastic film in the step S1 is a PP film.
The invention has the beneficial effects that:
the salt plastic printing flexible package produced by the invention has better performance than the original process, wherein the consumption of the printing ink and the consumption of the diluting solvent are greatly reduced and are far lower than the original process, on one hand, the discharge of a large amount of volatile organic solvents is avoided, the air pollution is reduced, and the treatment difficulty and the treatment cost of the volatile organic solvents are reduced; on the other hand, solvent volatilization on the printing production operation site is greatly reduced, the production operation site environment is improved, occupational health hazards of workers are reduced, safety risks are reduced, energy cost of drying and heating white ink is reduced, the carrying labor intensity of the workers is reduced, and production cost is reduced.
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.
Example 1
A production process of a salt plastic printing flexible package comprises the following steps:
s1, corona treatment: passing the PP film through a gap between a discharge knife rest and a blade, and performing surface treatment on the plastic film by using a high-frequency high-voltage power supply to generate corona, wherein the surface tension of the corona-treated film is more than 38 dyn/cm;
s2, printing: the plastic film after corona treatment is placed on a printing stock, and the printing plate with reverse pictures and texts is used for transferring the printing ink of various colors except white to the inner side of the plastic film, wherein the printing sequence is as follows: black, blue, red, yellow, special silver;
s3, drying, namely drying the film printed with the various color inks through an oven, wherein the temperature of the oven is 50 ℃, and the air volume is 3000m3/h；
S4, labeling and code spraying: labeling and spraying codes on the films printed with the various color inks by a professional labeling and code spraying rewinding platform;
s5, preparation of solvent-free adhesive: mixing the solvent-free adhesive A and the solvent-free adhesive B in proportion, and uniformly stirring to obtain a solvent-free adhesive, wherein the mass ratio of the solvent-free adhesive A to the solvent-free adhesive B is 100: 75, the preparation method of the solvent-free glue A comprises the following steps: performing vacuum dehydration treatment on polycaprolactone polyol at 110 ℃ until the water content is less than 0.05%, cooling to 45 ℃, putting the dehydrated polyester polyol into a reaction kettle, adding isocyanate into the polyester polyol, wherein the mass ratio of the polycaprolactone polyol to the isocyanate is 3: 2, heating to 75 ℃, introducing nitrogen to react for 2 hours, stopping heating, continuing introducing nitrogen to protect, and obtaining the solvent-free A glue after the temperature is reduced to room temperature; the preparation method of the solvent-free adhesive B comprises the following steps: carrying out vacuum dehydration on polytetrahydrofuran diol at 110 ℃ for 2h, cooling to 45 ℃, putting the dehydrated polytetrahydrofuran diol into a reaction kettle, adding a silane coupling agent into the polytetrahydrofuran diol, wherein the mass ratio of the polytetrahydrofuran diol to the silane coupling agent is 5: 3, introducing nitrogen at 70 ℃ for reaction for 1.5h, and cooling to room temperature to obtain solvent-free glue B;
s6, coating of solvent-free adhesive: coating the mixed solvent-free adhesive on the film after the printing, labeling and code spraying through a five-roller gluing device of a solvent-free compound machine, wherein the coating amount of the solvent-free adhesive is 1.3g/m2；
S7, bonding: bonding the film after printing, labeling, code spraying and coating with a second layer of film by using a composite roller, wherein the temperature of the composite roller is 45 ℃, and the composite pressure is 0.4 MPa;
and S8, curing, namely after the compound processing, sending the bonded film into a curing chamber for curing reaction. The curing temperature is 45 ℃, and the curing time is 36 hours;
s9, inspection: the cured film passes through a product inspection machine to remove waste products generated in the processes of printing, labeling, code spraying, bonding and the like;
s10, slitting: the inspected film passes through a splitting machine and is cut according to the width (290mm) and the number (6000 films/roll) required by a customer.
Example 2
A production process of a salt plastic printing flexible package comprises the following steps:
s1, corona treatment: passing the PP film through a gap between a discharge knife rest and a blade, and performing surface treatment on the plastic film by using a high-frequency high-voltage power supply to generate corona, wherein the surface tension of the corona-treated film is more than 38 dyn/cm;
s2, printing: the plastic film after corona treatment is placed on a printing stock, and the printing plate with reverse pictures and texts is used for transferring the printing ink of various colors except white to the inner side of the plastic film, wherein the printing sequence is as follows: black, blue, red, yellow, special red;
s3, drying, namely drying the film printed with the various color inks through an oven, wherein the temperature of the oven is 40 ℃, and the air volume is 3500m3/h；
S4, labeling and code spraying: labeling and spraying codes on the films printed with the various color inks by a professional labeling and code spraying rewinding platform;
s5, preparation of solvent-free adhesive: mixing the solvent-free adhesive A and the solvent-free adhesive B in proportion, and uniformly stirring to obtain a solvent-free adhesive, wherein the mass ratio of the solvent-free adhesive A to the solvent-free adhesive B is 100: 60, the preparation method of the solvent-free A glue comprises the following steps: performing vacuum dehydration treatment on polycaprolactone polyol at 105 ℃ until the water content is less than 0.05%, cooling to 40 ℃, putting the dehydrated polyester polyol into a reaction kettle, adding isocyanate into the polyester polyol, wherein the mass ratio of the polycaprolactone polyol to the isocyanate is 3: 2, heating to 70 ℃, introducing nitrogen to react for 1.5h, stopping heating, continuing introducing nitrogen to protect, and obtaining the solvent-free A glue after the temperature is reduced to room temperature; the preparation method of the solvent-free adhesive B comprises the following steps: carrying out vacuum dehydration on polytetrahydrofuran diol at 105 ℃ for 1.5h, cooling to 40 ℃, putting the dehydrated polytetrahydrofuran diol into a reaction kettle, adding a silane coupling agent into the polytetrahydrofuran diol, wherein the mass ratio of the polytetrahydrofuran diol to the silane coupling agent is 5: 3, introducing nitrogen at 65 ℃ for reaction for 1h, and cooling to room temperature to obtain solvent-free glue B;
s6, coating of solvent-free adhesive: coating the mixed solvent-free adhesive on the printed label by a five-roller gluing device of a solvent-free compound machineThe coating weight of the solvent-free adhesive on the film was 1g/m2；
S7, bonding: bonding the film after printing, labeling, code spraying and coating with a second layer of film by using a composite roller, wherein the temperature of the composite roller is 40 ℃, and the composite pressure is 0.6 MPa;
and S8, curing, namely after the compound processing, sending the bonded film into a curing chamber for curing reaction. The curing temperature is 40 ℃, and the curing time is 24 hours;
s9, inspection: the cured film passes through a product inspection machine to remove waste products generated in the processes of printing, labeling, code spraying, bonding and the like;
s10, slitting: and (4) cutting the inspected film by a splitting machine according to the width (280mm) and the number (6000 pieces/roll) required by a customer.
Example 3
A production process of a salt plastic printing flexible package comprises the following steps:
s1, corona treatment: passing the PP film through a gap between a discharge knife rest and a blade, and performing surface treatment on the plastic film by using a high-frequency high-voltage power supply to generate corona, wherein the surface tension of the corona-treated film is more than 38 dyn/cm;
s2, printing: the plastic film after corona treatment is placed on a printing stock, and the printing plate with reverse pictures and texts is used for transferring the printing ink of various colors except white to the inner side of the plastic film, wherein the printing sequence is as follows: black, blue, red, yellow, blue;
s3, drying, namely drying the film printed with the various color inks through an oven, wherein the temperature of the oven is 70 ℃, and the air volume is 4500m3/h；
S4, labeling and code spraying: labeling and spraying codes on the films printed with the various color inks by a professional labeling and code spraying rewinding platform;
s5, preparation of solvent-free adhesive: mixing the solvent-free adhesive A and the solvent-free adhesive B in proportion, and uniformly stirring to obtain a solvent-free adhesive, wherein the mass ratio of the solvent-free adhesive A to the solvent-free adhesive B is 100: 80, the preparation method of the solvent-free glue A comprises the following steps: performing vacuum dehydration treatment on polycaprolactone polyol at 115 ℃ until the water content is less than 0.05%, cooling to 50 ℃, putting the dehydrated polyester polyol into a reaction kettle, adding isocyanate into the polyester polyol, wherein the mass ratio of the polycaprolactone polyol to the isocyanate is 3: 2, heating to 80 ℃, introducing nitrogen to react for 2.5h, stopping heating, continuing introducing nitrogen to protect, and obtaining the solvent-free A glue after the temperature is reduced to room temperature; the preparation method of the solvent-free adhesive B comprises the following steps: carrying out vacuum dehydration on polytetrahydrofuran diol at 115 ℃ for 2.5h, cooling to 50 ℃, putting the dehydrated polytetrahydrofuran diol into a reaction kettle, adding a silane coupling agent into the polytetrahydrofuran diol, wherein the mass ratio of the polytetrahydrofuran diol to the silane coupling agent is 5: 3, introducing nitrogen at 75 ℃ for reaction for 2 hours, and cooling to room temperature to obtain solvent-free glue B;
s6, coating of solvent-free adhesive: coating the mixed solvent-free adhesive on the film after printing, labeling and code spraying through a five-roller gluing device of a solvent-free compound machine, wherein the coating amount of the solvent-free adhesive is 2g/m2；
S7, bonding: bonding the film after printing, labeling, code spraying and coating with a second layer of film by using a composite roller, wherein the temperature of the composite roller is 50 ℃, and the composite pressure is 0.2 MPa;
and S8, curing, namely after the compound processing, sending the bonded film into a curing chamber for curing reaction. The curing temperature is 50 ℃, and the curing time is 48 hours;
s9, inspection: the cured film passes through a product inspection machine to remove waste products generated in the processes of printing, labeling, code spraying, bonding and the like;
s10, slitting: and (4) cutting the film which is inspected and finished by a splitting machine according to the width (330mm) and the quantity (5000 pieces/roll) required by a customer.
Finished products in example 1, example 2, example 3 and the original process were taken out and tested, and the test results are shown in table 1.
TABLE 1 test results of the finished products
Detecting items Example 1 Example 2 Example 3 Original process
Appearance of the product Conform to Conform to Conform to Conform to
Heat sealing Strength (N/15mm) 35 42 40 34
White effect Conform to Conform to Conform to Conform to
Printing ink consumption (g/square meter) 0.13 0.98 0.11 3.55
Solvent dosage (g/square meter) 0.15 0.10 0.13 3.86
As can be seen from Table 1, the appearance and the white effect of the salt plastic printed flexible package produced by the invention both meet the standard requirements, wherein the heat sealing strength is higher than that of the original process, the ink consumption and the solvent consumption are far lower than those of the original process, the discharge of a large amount of Volatile Organic Solvents (VOCs) is reduced, the air pollution is reduced, and the difficulty and the treatment cost of the VOCs are reduced.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.

Claims (6)

1. A production process of a table salt plastic printing flexible package is characterized by comprising the following steps:
s1, corona treatment: passing the plastic film through the gap between the discharging knife rest and the blade, and performing surface treatment on the plastic film by using corona generated by a high-frequency high-voltage power supply;
s2, printing: placing the plastic film after corona treatment on a printing stock, and transferring the ink of various colors except white to the inner side of the plastic film by using a printing plate with reverse pictures and texts;
s3, drying, namely drying the film printed with the various color inks in an oven, wherein the temperature of the oven is 40-70 ℃, and the air volume is 3000-4500m3/h；
S4, labeling and code spraying: labeling and spraying codes on the films printed with the various color inks by a professional labeling and code spraying rewinding platform;
s5, preparation of solvent-free adhesive: mixing the solvent-free adhesive A and the solvent-free adhesive B in proportion, and uniformly stirring to obtain a solvent-free adhesive, wherein the mass ratio of the solvent-free adhesive A to the solvent-free adhesive B is 100: 60-100: 80;
s6, coating of solvent-free adhesive: coating the mixed solvent-free adhesive on the film subjected to printing, labeling and code spraying through a five-roller gluing device of a solvent-free compound machine;
s7, bonding: bonding the film after printing, labeling, code spraying and coating with a second layer of film by using a composite roller, wherein the temperature of the composite roller is 40-50 ℃;
and S8, curing, namely after the compound processing, sending the bonded film into a curing chamber for curing reaction. The curing temperature is 40-50 ℃, and the curing time is 24-48 h;
s9, inspection: the cured film passes through a product inspection machine to remove waste products generated in the processes of printing, labeling, code spraying, bonding and the like;
s10, slitting: and (4) cutting the film with good quality inspection by a splitting machine according to the width and the quantity required by a customer.
2. The production process of the table salt plastic printing flexible package of claim 1, which is characterized in that: the surface tension of the film after corona treatment in step S1 is greater than 38 dyn/cm.
3. The production process of the table salt plastic printing flexible package of claim 1, which is characterized in that: the preparation method of the solvent-free glue A in the step S5 comprises the following steps: performing vacuum dehydration treatment on polycaprolactone polyol at the temperature of 105-115 ℃ until the water content is less than 0.05%, cooling to 40-50 ℃, putting the dehydrated polyester polyol into a reaction kettle, adding isocyanate into the polyester polyol, wherein the mass ratio of the polycaprolactone polyol to the isocyanate is 3: 2, heating to 70-80 ℃, introducing nitrogen to react for 1.5-2.5h, stopping heating, continuing introducing nitrogen to protect, and obtaining the solvent-free A glue after the temperature is reduced to room temperature; the preparation method of the solvent-free adhesive B comprises the following steps: dehydrating polytetrahydrofuran diol in vacuum at 105-115 ℃ for 1.5-2.5h, cooling to 40-50 ℃, putting the dehydrated polytetrahydrofuran diol into a reaction kettle, adding a silane coupling agent into the polytetrahydrofuran diol, wherein the mass ratio of the polytetrahydrofuran diol to the silane coupling agent is 5: and 3, introducing nitrogen at 65-75 ℃ for reaction for 1-2h, and cooling to room temperature to obtain the solvent-free adhesive B.
4. The production process of the table salt plastic printing flexible package of claim 1, which is characterized in that: the coating weight of the solvent-free adhesive in the step S6 is 1-2g/m2。
5. The production process of the table salt plastic printing flexible package of claim 1, which is characterized in that: the compounding pressure of the compounding roller in the step S7 is 0.2-0.6 MPa.
6. The production process of the table salt plastic printing flexible package of claim 1, which is characterized in that: the plastic film in the step S1 is a PP film.
CN202010718351.1A 2020-07-23 2020-07-23 Production process of salt plastic printing flexible package Pending CN111823694A (en)

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