Continuous paper-plastic integrated forming drying-free production process

Abstract

The invention discloses a continuous paper-plastic integrated forming drying-free production process. The process comprises the following steps: step 1, raw material pretreatment; 2, preparing a multi-layer composite film; 3, configuration of continuous forming equipment; step 4, chemical curing; 5, demolding and post-processing are carried out; step 6, surface coating; step 7, online detection; and step 8, packaging and warehousing. Through the continuous and integrated production process, efficient forming of the paper-plastic product is achieved, an additional drying step is not needed, energy consumption is remarkably reduced, and the production period is remarkably shortened. Meanwhile, the process adopts a mode of combining chemical curing and hot-pressing shaping, so that the interlayer bonding strength and the overall performance of the product are ensured, and the problems of layering, deformation and the like possibly occurring in the traditional process are avoided.

Description

Technical Field

[0001] This invention relates to the field of paper-plastic product molding technology, specifically a continuous paper-plastic integrated molding process that eliminates the need for drying. Background Technology

[0002] Traditional paper-plastic molding processes typically involve steps such as suction molding, cold extrusion dehydration, and hot pressing drying, resulting in high energy consumption, long production cycles, and complex equipment. For example, the cold extrusion process requires multi-station mold linkage to achieve dehydration, leading to large equipment space requirements and high time costs. In addition, traditional processes rely on hot air drying to reduce moisture content, which not only consumes significant energy but may also cause product deformation or reduced strength due to uneven temperature.

[0003] Existing technologies, such as patent CN117488597A, disclose a hot-pressing process for paper-plastic molding for inner and outer surface processing, and patent CN118461353A, disclose a paper-plastic molding formula and manufacturing process. These attempts attempt to reduce drying time through rapid curing via hot pressing, but still require high-temperature treatment and cannot completely eliminate the drying step. For example, the preparation of carbon dioxide-propylene oxide copolymer-based paper-plastic composite films requires hot pressing at 120-160℃ for 1-5 seconds, which shortens the drying time but still results in high energy consumption. Furthermore, the interlayer bonding strength of multi-layer paper-plastic structures is insufficient, easily leading to delamination and affecting product performance.

[0004] Therefore, developing a continuous, drying-free paper-plastic molding process that can guarantee product performance is of great practical significance. Summary of the Invention

[0005] The purpose of this invention is to provide a continuous paper-plastic integrated molding process that eliminates the need for drying, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a continuous paper-plastic integrated molding process without drying, comprising the following steps:

[0007] Step 1: Raw material pretreatment: First, prepare the pulp, then process the plastic granules, and then age the pretreated pulp and plastic granules.

[0008] Step 2: Preparation of multilayer composite film: The multilayer composite film includes an inner film layer, an intermediate layer, and an outer film layer. The inner film layer is a PE or PP layer, the intermediate layer is a double-layer paper sandwiched with a PET layer, and the outer film layer is a CPP or BOPP layer. The surface coating layer is a styrene-acrylate copolymer coating. The inner, intermediate, and outer layers are prepared separately.

[0009] Step 3: Configuration of continuous forming equipment: including configuration of hub forming unit, alignment unit, transfer mechanism and hot pressing unit;

[0010] Step 4, Chemical Curing: During the hot pressing process, the curing agent undergoes a cross-linking reaction with the active groups in the pulp and plastic; the exothermic peak temperature is controlled at 100-120℃. By adjusting the curing agent ratio and hot pressing parameters, the curing time is ensured to be 30-60 seconds, and the material is completely cured; the curing agent must be used within 4-6 hours after mixing to avoid gelation.

[0011] Step 5, Demolding and Post-processing: After hot pressing, the finished product is ejected from the mold by a pneumatic demolding mechanism and transferred to a trimming machine to remove excess material; the finished product is sterilized with ultraviolet light and the interlayer bonding strength is tested by a 180° peel test, which requires ≥1.0N / 15mm; at the same time, a tensile strength test is performed, which requires ≥15MPa;

[0012] Step 6, Surface Coating: Liquid coating is sprayed onto the surface of the finished product by driving the nozzle unit through a programmable moving device;

[0013] Step 7: Online Inspection: The finished products are inspected using a machine vision system to identify surface defects (such as bubbles and scratches) at a speed of 5-10 pieces / second. At the same time, the product moisture content is monitored online using an infrared sensor to ensure it is ≤8%, eliminating the need for additional drying.

[0014] Step 8, Packaging and Warehousing: Cut and package qualified products according to specifications, using PE film wrapping; store packaged products in a dry environment, and conduct regular random checks on performance indicators.

[0015] Preferably, step one specifically includes the following steps:

[0016] S1. Pulp preparation: After crushing waste paper, plant fibers and other raw materials, add water and dispersant, and stir in a pulper to a concentration of 15%-20%, with fiber length controlled at 0.5-2mm; pulping time is 20-30 minutes, and temperature is controlled at 40-50℃ to promote fiber dispersion and fibrillation.

[0017] S2. Plastic granule treatment: Select PP or PE granules (particle size 0.1-0.5mm, ash content ≤15%, fat dissolving capacity 5-10g / 10min), add antioxidants and lubricants, premix in a high-speed mixer for 5-10 minutes at a mixing speed of 800-1200rpm to ensure uniform dispersion of additives;

[0018] S3. Aging treatment: The pretreated pulp and plastic granules are aged separately in sealed containers for 12-24 hours. The aging temperature of the pulp is 25-30℃, and the aging temperature of the plastic granules is 40-50℃, in order to stabilize the properties of the raw materials and promote the uniformity of subsequent mixing.

[0019] Preferably, the dispersant in S1 is polyacrylamide, and the dosage is 0.1%-0.3% of the pulp mass; the antioxidant in S2 is BHT, and the dosage is 0.05%-0.1%; the lubricant is stearic acid, and the dosage is 0.1%-0.3%.

[0020] Preferably, step two specifically includes the following steps:

[0021] A1. Inner Layer: The pretreated pulp and plastic granules are mixed at a mass ratio of 7:3. A two-component polyurethane curing agent is added, and the mixture is stirred evenly before granulation through a twin-screw extruder. The granulation temperature is controlled as follows: Zone 1 140-145℃, Zone 2 150-155℃, Zone 3 155-165℃, Zone 4 165-175℃, Zone 5 175-180℃, Zone 6 175-185℃, Zone 7 170-175℃, die head temperature 140-155℃, and screw speed 200-300rpm to ensure that the material is fully melted and mixed.

[0022] A2. Intermediate layer: Adopts a double-layer paper sandwich PET layer structure, with each double paper layer having a thickness of 0.1-0.3mm and the PET layer having a thickness of 0.01-0.05mm; It is laminated by hot press rollers at 120-160℃ and 0.1-0.3MPa for 1-5 seconds, while high-frequency vibration is applied to enhance the interlayer bonding force.

[0023] A3. Outer layer: PP granules are mixed with a slip agent and a CPP layer is prepared by blowing film machine; the blowing temperature is controlled as follows: Zone 1 160-165℃, Zone 2 170-175℃, Zone 3 165-170℃, die head temperature 165-170℃, blow-up ratio 2.5-3.5, traction speed 10-20m / min, and thickness 0.02-0.08mm.

[0024] Preferably, in A1, the two-component polyurethane curing agent is KF-A:KF-B, where KF-A:KF-B = 5:1; the amount of ethyl acetate as a diluent is 2-4 times the total mass of the curing agent; the purity must be ≥99.8%; and the water content must be ≤500ppm. In A2, the frequency of the high-frequency vibration is 20-50Hz, and the amplitude is 0.1-0.3mm. In A3, the slip agent is erucamide, and the amount used is 1%.

[0025] Preferably, in step three, the rotary drum forming unit employs a rotatable rotary drum forming machine equipped with multiple suction molds. The mesh size of the mold surface is 0.1-0.3mm. The rotary drum rotation speed is 5-10 revolutions per minute, the suction time is 20-30 seconds, the vacuum degree is -0.08 to -0.1MPa, and the dehydration chamber pressure is 0.2-0.4MPa, in order to achieve efficient dehydration.

[0026] Alignment Unit: Equipped with a contour jig plate, driven by a servo motor at a speed of 0.5-1.5m / s, it receives the initial blanks output from the rotating drum forming unit and performs position calibration and edge trimming;

[0027] Transfer mechanism: A multi-axis robot equipped with a vacuum suction cup with a suction force of 0.05-0.1MPa is used to transfer the preform to the hot pressing and shaping unit. The transfer time is ≤10 seconds and the positioning accuracy is ±0.1mm.

[0028] Hot pressing and shaping unit: Equipped with upper and lower hot pressing molds, using medium-temperature and medium-pressure steam heating, with a temperature of 150-180℃ and a pressure of 6-8 bar, a hot pressing temperature of 120-160℃, a pressure of 0.1-0.3MPa, and a hot pressing time of 30-60 seconds; At the same time, the air blowing mechanism is activated with an air pressure of 0.2-0.4MPa to accelerate the reaction of the curing agent, and is equipped with a temperature sensor to monitor the surface temperature of the mold in real time, with the deviation controlled within ±2℃.

[0029] Preferably, in step five, the air pressure of the pneumatic demolding mechanism is 0.4-0.6 MPa, the cutting speed of the edge trimming machine is 20-30 pieces / minute, and the blade gap is 0.05-0.1 mm to ensure neat cuts; the wavelength of ultraviolet sterilization is 254 nm, the irradiation time is 30-60 seconds, the speed of the 180° peel test is 300 mm / min, the sample width is 15 mm, the speed of the tensile strength test is 250 mm / min, and the sample width is 15 mm.

[0030] Preferably, the liquid coating in step six comprises styrene-acrylate copolymer, polyethylene wax, water, butyl acetate and amine antioxidant; the spraying pressure is 0.3-0.5 MPa, the spraying speed is 10-20 m / min, and the coating thickness is 20-200 μm.

[0031] Preferably, in step eight, the PE film wrapping speed is 10-15 pieces / minute; the temperature of the drying environment is 20-25℃, and the humidity is ≤60%.

[0032] Compared with the prior art, the beneficial effects of the present invention are:

[0033] This invention achieves efficient molding of paper-plastic products through a continuous, integrated production process, eliminating the need for additional drying steps and significantly reducing energy consumption and production cycle time. Simultaneously, the process combines chemical curing with hot pressing to ensure interlayer bonding strength and overall performance, avoiding delamination and deformation problems that may occur in traditional processes. Furthermore, this invention further improves product quality and stability by optimizing raw material pretreatment and multilayer composite film preparation, providing a new technical path and solution for the production of paper-plastic products. Attached Figure Description

[0034] Figure 1 This is a flowchart of the production process of the present invention. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0036] Please see Figure 1 This invention provides a continuous paper-plastic integrated molding process that eliminates the need for drying, comprising the following steps:

[0037] Step 1: Raw Material Pretreatment: First, pulp is prepared, then plastic granules are processed, and the pretreated pulp and plastic granules are aged. Specifically, this includes the following steps:

[0038] S1. Pulp preparation: After crushing waste paper, plant fibers, and other raw materials, add water and dispersant, and stir in a pulper until the concentration is 15%-20%, and the fiber length is controlled at 0.5-2mm; the pulping time is 20-30 minutes, and the temperature is controlled at 40-50℃ to promote fiber dispersion and fibrillation; the dispersant is polyacrylamide, and the dosage is 0.1%-0.3% of the pulp mass;

[0039] S2. Plastic Granule Treatment: Select PP or PE granules (particle size 0.1-0.5mm, ash content ≤15%, solvent concentration 5-10g / 10min), add antioxidants and lubricants, and premix in a high-speed mixer for 5-10 minutes at a mixing speed of 800-1200rpm to ensure uniform dispersion of the additives; the antioxidant is BHT, with a dosage of 0.05%-0.1%; the lubricant is stearic acid, with a dosage of 0.1%-0.3%.

[0040] S3. Aging treatment: The pretreated pulp and plastic granules are aged separately in sealed containers for 12-24 hours. The aging temperature of the pulp is 25-30℃ and the aging temperature of the plastic granules is 40-50℃, in order to stabilize the properties of the raw materials and promote the uniformity of subsequent mixing.

[0041] Step 2: Preparation of the multilayer composite film: The multilayer composite film includes an inner film layer, an intermediate layer, and an outer film layer. The inner film layer is a PE or PP layer, the intermediate layer is a double-layer paper sandwiched with a PET layer, and the outer film layer is a CPP or BOPP layer. The surface coating layer is a styrene-acrylate copolymer coating. The inner, intermediate, and outer layers are prepared separately, specifically including the following steps:

[0042] A1. Inner Layer: The pretreated pulp and plastic granules are mixed at a mass ratio of 7:3. A two-component polyurethane curing agent is added, and the mixture is stirred evenly before granulation using a twin-screw extruder. The granulation temperature is controlled as follows: Zone 1 140-145℃, Zone 2 150-155℃, Zone 3 155-165℃, Zone 4 165-175℃, Zone 5 175-180℃, Zone 6 175-185℃, Zone 7 170-175℃, die head temperature 140-155℃, and screw speed 200-300 rpm to ensure that the material is fully melted and mixed. The two-component polyurethane curing agent is KF-A:KF-B, KF-A:KF-B = 5:1. The amount of ethyl acetate used as a diluent is 2-4 times the total mass of the curing agent, and the purity must be ≥99.8%, with a water content ≤500ppm.

[0043] A2. Intermediate Layer: Adopts a double-layer paper sandwiched with a PET layer structure, with each double-layer paper thickness being 0.1-0.3mm and the PET layer thickness being 0.01-0.05mm; it is laminated by hot pressing rollers at 120-160℃ and 0.1-0.3MPa for 1-5 seconds, while high-frequency vibration is applied to enhance the interlayer bonding force; the frequency of the high-frequency vibration is 20-50Hz, and the amplitude is 0.1-0.3mm;

[0044] A3. Outer Layer: PP granules are mixed with a slip agent, and a CPP layer is prepared using a blown film machine. The blown film temperature is controlled as follows: Zone 1 160-165℃, Zone 2 170-175℃, Zone 3 165-170℃, die head temperature 165-170℃, blow-up ratio 2.5-3.5, traction speed 10-20m / min, and thickness 0.02-0.08mm. The slip agent is erucamide, with a dosage of 1%.

[0045] Step 3, Continuous Molding Equipment Configuration: This includes configuring a rotary drum molding unit, an alignment unit, a transfer mechanism, and a hot-pressing unit. The rotary drum molding unit uses a rotatable rotary drum molding machine equipped with multiple suction molds. The mold surface has a permeable mesh size of 0.1-0.3mm. The drum speed is 5-10 rpm, the suction time is 20-30 seconds, the vacuum degree is -0.08 to -0.1MPa, and the dewatering chamber pressure is 0.2-0.4MPa to achieve efficient dewatering.

[0046] Alignment Unit: Equipped with a contour jig plate, driven by a servo motor at a speed of 0.5-1.5m / s, it receives the initial blanks output from the rotating drum forming unit and performs position calibration and edge trimming;

[0047] Transfer mechanism: A multi-axis robot equipped with a vacuum suction cup with a suction force of 0.05-0.1MPa is used to transfer the preform to the hot pressing and shaping unit. The transfer time is ≤10 seconds and the positioning accuracy is ±0.1mm.

[0048] Hot pressing and shaping unit: Equipped with upper and lower hot pressing molds, using medium-temperature and medium-pressure steam heating at 150-180℃ and 6-8 bar, with a hot pressing temperature of 120-160℃, a pressure of 0.1-0.3 MPa, and a hot pressing time of 30-60 seconds; simultaneously, an air blowing mechanism is activated at a pressure of 0.2-0.4 MPa to accelerate the reaction of the curing agent, and a temperature sensor is equipped to monitor the mold surface temperature in real time, with the deviation controlled within ±2℃;

[0049] Step 4, Chemical Curing: During the hot pressing process, the curing agent undergoes a cross-linking reaction with the active groups in the pulp and plastic; the exothermic peak temperature is controlled at 100-120℃. By adjusting the curing agent ratio and hot pressing parameters, the curing time is ensured to be 30-60 seconds, and the material is completely cured; the curing agent must be used within 4-6 hours after mixing to avoid gelation.

[0050] Step 5: Demolding and Post-processing: After hot pressing, the finished product is ejected from the mold using a pneumatic demolding mechanism and transferred to a trimming machine to remove excess material. The finished product is then subjected to ultraviolet sterilization and a 180° peel test to check the interlayer bonding strength, requiring ≥1.0N / 15mm. Simultaneously, a tensile strength test is performed, requiring ≥15MPa. The air pressure of the pneumatic demolding mechanism is 0.4-0.6MPa, the trimming speed of the trimming machine is 20-30 pieces / minute, and the blade gap is 0.05-0.1mm to ensure clean cuts. The wavelength of ultraviolet sterilization is 254nm, the irradiation time is 30-60 seconds, the speed of the 180° peel test is 300mm / min, and the sample width is 15mm. The speed of the tensile strength test is 250mm / min, and the sample width is 15mm.

[0051] Step 6, Surface Coating: The nozzle unit is driven by a programmable moving device to spray liquid coating onto the surface of the finished product; the liquid coating consists of styrene-acrylate copolymer, polyethylene wax, water, butyl acetate and amine antioxidants; the spraying pressure is 0.3-0.5MPa, the spraying speed is 10-20m / min, and the coating thickness is 20-200μm;

[0052] Step 7: Online Inspection: The finished products are inspected using a machine vision system to identify surface defects (such as bubbles and scratches) at a speed of 5-10 pieces / second. At the same time, the product moisture content is monitored online using an infrared sensor to ensure it is ≤8%, eliminating the need for additional drying.

[0053] Step 8, Packaging and Warehousing: Cut and package qualified products according to specifications using PE film wrapping; store packaged products in a dry environment and conduct regular spot checks on performance indicators; the PE film wrapping speed is 10-15 pieces / minute; the temperature of the dry environment is 20-25℃ and the humidity is ≤60%.

[0054] Example 1:

[0055] Food packaging containers

[0056] Raw material ratio:

[0057] Inner layer: 70% pulp, 30% PP granules, KF-A / KF-B curing agent (5:1), 2 times the amount of ethyl acetate diluent.

[0058] Middle layer: Double-layered paper (0.2mm each) sandwiching a PET layer (0.03mm).

[0059] Outer layer: CPP layer (0.05mm).

[0060] Process parameters:

[0061] Rotary drum speed: 8 rpm, suction time: 25 seconds, vacuum degree: -0.09 MPa.

[0062] Hot pressing temperature: 130℃, pressure: 0.2MPa, hot pressing time: 45 seconds.

[0063] The exothermic peak temperature of the curing agent is 110℃, and the curing time is 40 seconds.

[0064] Surface coating: Coating thickness 50μm, drying temperature 70℃, drying time 8 minutes.

[0065] Performance testing:

[0066] Interlayer peel strength: 1.2N / 15mm, conforming to GB / T10004-2008 standard.

[0067] Tensile strength: 18MPa, moisture content: 6.5%, surface abrasion resistance: no significant wear after 50 RCA tests.

[0068] Example 2: Industrial Packaging Pallets

[0069] Raw material ratio:

[0070] Inner layer: 60% pulp, 40% PP granules, E402-80B curing agent (7.1%).

[0071] Middle layer: Double-layered paper (0.3mm each) sandwiching a 0.05mm PET aluminized layer.

[0072] Outer layer: BOPP layer (0.08mm).

[0073] Process parameters:

[0074] Drum speed: 6 rpm, suction time: 30 seconds, vacuum degree: -0.1 MPa.

[0075] Hot pressing temperature: 150℃, pressure: 0.3MPa, hot pressing time: 60 seconds.

[0076] Curing agent exothermic peak temperature: 120℃, curing time: 50 seconds.

[0077] Surface coating: Coating thickness 100μm, drying temperature 80℃, drying time 10 minutes.

[0078] Performance testing:

[0079] Interlayer peel strength: 1.5 N / 15 mm, compressive strength: 55 MPa, moisture content: 7.2%, oxygen barrier properties: oxygen permeability ≤ 5 cm. 3 / (m 2 ·24h·0.1MPa).

[0080] Example 3: Medical Packaging Box

[0081] Raw material ratio:

[0082] Inner layer: 80% aseptic pulp, 20% PE granules, E402-80B curing agent (7.1%).

[0083] Middle layer: Single layer of paper (0.2mm).

[0084] Outer layer: CPP layer (0.03mm).

[0085] Process parameters:

[0086] Rotary drum speed: 10 rpm, suction time: 20 seconds, vacuum degree: -0.08 MPa.

[0087] Hot pressing temperature: 120℃, pressure: 0.1MPa, hot pressing time: 30 seconds.

[0088] Curing agent exothermic peak temperature: 100℃, curing time: 30 seconds.

[0089] Surface coating: Coating thickness 30μm, drying temperature 60℃, drying time 5 minutes.

[0090] Performance testing:

[0091] Interlayer peel strength: 1.0N / 15mm; Microbial test: conforms to GB15980-1995 standard; Light transmittance: 8%; Water resistance: no penetration after 24 hours of water resistance test.

[0092] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A continuous paper-plastic integrally formed and dry-free production process, characterized by: The method comprises the following steps: Step one, raw material pretreatment: first, paper pulp is prepared, then plastic particles are treated, and the pretreated paper pulp and plastic particles are aged; Step two, preparation of multi-layer composite film: the multi-layer composite film comprises an inner film layer, an intermediate layer and an outer film layer, the inner film layer is a PE or PP layer, the intermediate layer is a double-layer paper sandwiching PET layer, the outer film layer is a CPP or BOPP layer, and the surface coating layer is a styrene-acrylate copolymer coating layer; the inner layer, the intermediate layer and the outer layer are prepared respectively; Step three, configuration of continuous forming equipment: comprising configuration of hub forming unit, alignment unit, transfer mechanism and hot pressing and shaping unit; Step four, chemical curing: in the hot pressing process, the curing agent reacts with the active groups in the paper pulp and the plastic; the exothermic peak temperature is controlled at 100-120℃, the curing time is ensured to be 30-60 seconds by adjusting the curing agent ratio and the hot pressing parameters, and the material is completely cured; the curing agent needs to be used up within 4-6 hours after mixing to avoid gelation; Step five, demolding and post-treatment: after hot pressing, the finished product is ejected from the mold by a pneumatic demolding mechanism and transferred to an edge trimmer to remove excess material; the finished product is sterilized by ultraviolet light, and the interlayer bonding strength is detected by 180° peeling test, which is required to be ≥1.0N / 15mm; at the same time, the tensile strength test is carried out, which is required to be ≥15MPa; Step six, surface coating: a nozzle unit is driven by a programmable moving device to spray liquid coating on the surface of the finished product; Step seven, online detection: a machine vision system is used to detect the appearance of the finished product, identify surface defects, and the detection speed is 5-10 pieces / second; at the same time, the product moisture content is monitored online by an infrared sensor to ensure that it is ≤8%, without the need for additional drying; Step eight, packaging and storage: the qualified products are cut and packaged according to specifications, and are wrapped with PE film; the packaged products are stored in a dry environment, and performance indicators are regularly sampled and tested.

2. A continuous paper-plastic integrally formed and dry-free production process according to claim 1, characterized in that: The step one specifically comprises the following steps: S1, paper pulp preparation: after the raw materials such as waste paper and plant fibers are crushed, water and a dispersing agent are added, and stirring is carried out in a beater to a concentration of 15%-20% and a fiber length of 0.5-2mm; the beating time is 20-30 minutes, and the temperature is controlled at 40-50℃ to promote fiber dispersion and fibrillation; S2, plastic particle treatment: PP or PE particles (particle size 0.1-0.5mm, ash content ≤15%, and fat solubility 5-10g / 10min) are selected, an antioxidant and a lubricant are added, and pre-mixing is carried out in a high-speed mixer for 5-10 minutes at a mixing speed of 800-1200rpm to ensure uniform dispersion of the additives; S3, aging treatment: the pretreated paper pulp and plastic particles are aged in sealed containers for 12-24 hours, the paper pulp aging temperature is 25-30℃, and the plastic particle aging temperature is 40-50℃ to stabilize the performance of the raw materials and promote subsequent uniform mixing.

3. A continuous paper-plastic integrally formed and dry-free production process according to claim 2, characterized in that: The dispersing agent in S1 is polyacrylamide, and the amount used is 0.1%-0.3% of the mass of the paper pulp; the antioxidant in S2 is BHT, and the amount used is 0.05%-0.1%; The lubricant is stearic acid, and the amount used is 0.1%-0.3%.

4. A continuous paper-plastic integrally formed and dry-free production process according to claim 1, characterized in that: The second step is specifically comprising the following steps: A1, inner layer: mix the pretreated paper pulp with plastic particles at a mass ratio of 7:3, add a two-component polyurethane curing agent, stir uniformly, and then granulate through a double-screw extruder; the granulation temperature is controlled at: zone 1 140-145℃, zone 2 150-155℃, zone 3 155-165℃, zone 4 165-175℃, zone 5 175-180℃, zone 6 175-185℃, zone 7 170-175℃, die head temperature 140-155℃, and screw rotation speed 200-300rpm, to ensure that the material is fully melted and mixed; A2, middle layer: adopt a double-layer paper sandwiching a PET layer structure, the thickness of the double-layer paper is 0.1-0.3mm, and the thickness of the PET layer is 0.01-0.05mm; composite through a hot press roller at 120-160℃ and 0.1-0.3MPa, hot press time 1-5 seconds, and at the same time, apply high-frequency vibration to enhance the interlayer bonding force; A3, outer layer: mix PP particles with a slip agent and prepare a CPP layer through a film blowing machine; the film blowing temperature is controlled at: zone 1 160-165℃, zone 2 170-175℃, zone 3 165-170℃, die head temperature 165-170℃, blowing ratio 2.5-3.5, pulling speed 10-20m / min, and thickness 0.02-0.08mm.

5. A continuous paper-plastic integrally formed and dry-free production process according to claim 4, characterized in that: In the A1, the two-component polyurethane curing agent is KF-A:KF-B, KF-A:KF-B=5:1, the amount of diluent ethyl acetate is 2-4 times the total mass of the curing agent, the purity needs to be ≥99.8%, and the water content is ≤500ppm; in the A2, the frequency of high-frequency vibration is 20-50Hz, and the amplitude is 0.1-0.3mm; in the A3, the slip agent is erucic acid amide, and the amount used is 1%.

6. The method of claim 1, wherein the method is a continuous paper-plastic integrated forming and drying-free production process. In the third step, the hub forming unit: adopt a rotatable hub forming machine, equipped with multiple suction pulp molds, the mesh aperture of the air-permeable net on the mold surface is 0.1-0.3mm; the rotation speed of the hub is 5-10 revolutions per minute, the suction pulp time is 20-30 seconds, the vacuum degree is -0.08 to -0.1MPa, and the dehydration air chamber pressure is 0.2-0.4MPa, to realize efficient dehydration; The alignment unit: set a profiling jig plate, driven by a servo motor, the speed is 0.5-1.5m / s, receive the initial embryo product output by the hub forming unit, and perform position calibration and edge trimming; The transfer mechanism: adopt a multi-axis robot, equipped with a vacuum suction cup, the suction force is 0.05-0.1MPa, transfer the initial embryo product to the hot press setting unit, the transfer time is ≤10 seconds, and the positioning accuracy is ±0.1mm; The hot press setting unit: set an upper and lower hot press mold, adopt medium temperature and medium pressure steam heating, the temperature is 150-180℃, the pressure is 6-8bar, the hot press temperature is 120-160℃, the pressure is 0.1-0.3MPa, and the hot press time is 30-60 seconds; at the same time, start the air blowing mechanism, the air pressure is 0.2-0.4MPa, accelerate the curing agent reaction, and equipped with a temperature sensor to monitor the mold surface temperature in real time, the deviation is controlled within ±2℃.

7. The method of claim 1, wherein the method is characterized by: The air pressure of the pneumatic demolding mechanism in the step five is 0.4-0.6 MPa, the trimming speed of the trimming machine is 20-30 pieces / min, the blade gap is 0.05-0.1 mm, the wavelength of the ultraviolet sterilization is 254 nm, the irradiation time is 30-60 seconds, the speed of the 180° peeling test is 300 mm / min, the sample width is 15 mm, the speed of the tensile strength test is 250 mm / min, and the sample width is 15 mm.

8. The method of claim 1, wherein the method is a continuous paper-plastic integrated forming and drying-free production process, characterized in that: The components of the liquid coating in the step six include styrene-acrylate copolymer, polyethylene wax, water, butyl acetate and amine antioxidant; the spraying pressure is 0.3-0.5 MPa, the spraying speed is 10-20 m / min, and the coating thickness is 20-200 μm.

9. The method of claim 1, wherein the method is characterized by: The PE film winding and packaging speed in the step eight is 10-15 pieces / min; the temperature of the drying environment is 20-25℃, and the humidity is ≤60%.

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