A pulp molding product and a preparation method thereof

Abstract

The present application discloses a pulp molding product and a preparation method thereof, a preparation method of a pulp molding product, comprising: (1) mixing and stirring pulp with chemical additives to obtain a slurry, the concentration of the slurry being 0.3% to 0.8%; (2) under the conditions of a vacuum degree of -0.05 to 0.08 Mpa and a mechanical pressure of 0 t to 300 t, putting the slurry into a molding die by means of suction or injection to dehydrate the slurry and obtain a green blank with a water content of 45 to 80%; (3) transferring the green blank to a heat setting die, and carrying out drying and setting under the conditions of a temperature of 120°C to 250°C, a vacuum degree of -0.05 to 0.08 Mpa, and a mechanical pressure of 0 t to 100 t to obtain a dry blank, the water content of the dry blank being 0 to 8%. By reasonably proportioning fibers of different lengths, the strength between the fibers is increased, and a product with qualified hardness and stiffness is obtained; the method has environmentally friendly raw materials, is easy to degrade and does not pollute the environment; the entire production process has zero emissions and can achieve closed-loop recycling.

Description

Technical Field

[0001] This application relates to the comprehensive utilization of biomass, and specifically relates to a pulp molding product and a preparation method thereof. Background Art

[0002] Currently, plastic products are widely used. However, the white pollution caused by the abuse of plastics is becoming increasingly serious. Because of its long degradation time, plastic particles will be generated, polluting the environment. Moreover, the consumption of plastics is increasing day by day, but its recycling is difficult and it is difficult to carry out environmentally friendly treatment, which does not conform to the development of a circular, low-carbon, and environmentally friendly sustainable economic form. Summary of the Invention

[0003] Based on this, this application discloses an environmentally friendly and economical pulp molding product and a preparation method thereof. This pulp molding product can replace some plastic products and reduce environmental pollution.

[0004] The present invention provides a preparation method of a pulp molding product, and the preparation method includes: (1) mixing and stirring pulp with chemical additives to obtain a slurry, and the concentration of the slurry is 0.3% - 0.8%; (2) under the conditions of a vacuum degree of -0.05 - 0.08 Mpa and a mechanical pressure of 0 t - 300 t, putting the slurry into a molding die by a suction or injection method to dehydrate the slurry and obtain a wet blank with a water content of 45 - 80%; (3) transferring the wet blank to a heat setting die, and carrying out drying and setting under the conditions of a temperature of 120°C - 250°C, a vacuum degree of -0.05 - 0.08 Mpa, and a mechanical pressure of 0 t - 100 t to obtain a dry blank, and the water content of the dry blank is 0 - 8%.

[0005] Specifically, the slurry concentration refers to the content of the total dry weight of the pulp in the slurry.

[0006] Furthermore, the preparation method further includes:

[0007] Surface spraying or roll coating: spraying PLA film on the surface of the wet blank and / or dry blank or roll coating the chemical additives.

[0008] Preferably, the pulp is selected from one or more of chemical pulp, chemi-thermomechanical pulp, and mechanical pulp; among them, the chemical pulp, chemi-thermomechanical pulp, and mechanical pulp can be compounded in any proportion. The chemical additives are selected from one or more of oil-proof agents, waterproof agents, moisture-proof agents, flame retardants, anti-fouling agents, non-wood fiber materials, and other acceptable chemical additives, and other natural plant fibers.

[0009] Furthermore, based on the weight of the absolutely dry pulp, the pulp includes 0 - 100 parts of the chemical pulp, 0 - 100 parts of the chemi-thermomechanical pulp, and 0 - 100 parts of the mechanical pulp.

[0010] Preferably, based on the weight of the absolutely dry pulp, the pulp comprises 30-70 parts of the chemical pulp, 20-50 parts of the chemi-thermomechanical pulp, and 25-55 parts of the mechanical pulp.

[0011] Preferably, the pulp comprises 40-60 parts of the chemical pulp, 25-35 parts of the chemi-thermomechanical pulp, and 35-45 parts of the mechanical pulp.

[0012] The present invention also provides a pulp molding product made by the preparation method described in any one of the above.

[0013] Further, based on the weight of the absolutely dry pulp, the pulp molding product mainly consists of 80-100 parts of the pulp and 0-20 parts of chemical additives.

[0014] Preferably, based on the weight of the absolutely dry pulp, the pulp molding product mainly consists of 90-100 parts of the pulp, 0-1 part of the oil-proof agent, and 0-1 part of the waterproof agent.

[0015] Preferably, based on the weight of the absolutely dry pulp, the pulp molding product mainly consists of 82-89 parts of the pulp, 1-2 parts of the oil-proof agent, 1-1.5 parts of the waterproof agent, 2-2.5 parts of the moisture-proof agent, 3-4 parts of the flame retardant, and 5-10 parts of the non-wood fiber material.

[0016] Specifically, the oil-proof agent is selected from Daikin of Japan; the waterproof agent is selected from Kemira AKD; the moisture-proof agent is selected from nitro paint moisture-proof agent; the flame retardant is selected from additive flame retardant; the anti-fouling agent is selected from environmentally friendly and highly efficient CPC; the non-wood fiber material is selected from reed.

[0017] Further, the dry blank is trimmed and shaped to obtain the product, and the dryness of the product needs to reach more than 92%.

[0018] Further, the pulp molding product can be products such as tableware for holding food.

[0019] Further, the pulp molding product can be products such as interior decoration ceiling and wall paper for buildings.

[0020] The preparation method of the pulp molding product provided by the present invention is to adopt different pulping methods for natural plant raw materials to obtain fibers of different lengths, and to rationally mix the fibers of different lengths, so as to increase the strength between the fibers and obtain a product with hardness and stiffness meeting the requirements; the method has environmental-friendly raw materials, is easy to degrade and does not pollute the environment; the entire production process has zero emissions and can achieve closed-loop recycling. Description of the Drawings

[0021] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without exceeding the scope protected by the present application.

[0022] Figure 1 Flow chart for preparing a pulp molding product according to an embodiment of the present invention Detailed implementation manners

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope protected by the present application.

[0024] The present application uses natural plant fibers as raw materials and obtains fibrous substances, i.e., pulp, through different pulping methods. It can be divided into chemical pulp, mechanical pulp, and chemo-mechanical pulp according to the processing method.

[0025] Chemical pulp is obtained by chemically dissociating plant fibers. The fibers are slender and strong, and it has excellent folding resistance, bursting resistance, and tearing strength.

[0026] Mechanical pulp is made by mechanically grinding fiber raw materials. Its fibers are short, the content of non-cellulose components is high, and the strength of the finished product is low.

[0027] Chemo-mechanical pulp is made by chemical pretreatment and mechanical post-treatment. First, mild pretreatment (impregnation or cooking) is carried out with chemicals to remove part of the hemicellulose in the wood chips, and less lignin is dissolved or basically not dissolved, but the intercellular layer is softened. Then, post-treatment is carried out with a disk refiner to grind the softened wood chips (or straw chips) to separate the fibers into pulp. Chemo-mechanical pulp generally contains a relatively high content of lignin and cellulose components and a relatively low content of hemicellulose components. Its physical strength is between that of chemical pulp and mechanical pulp, and it can give the finished product very good stiffness.

[0028] The natural plant fiber raw materials can be selected from wood, bamboo, reed, cotton, hemp, grass, etc.

[0029] Figure 1 The following shows the flow chart for preparing a pulp molding product according to an embodiment of the present invention. The preparation method of the pulp molding product includes:

[0030] (1) Mix chemical pulp, chemo-mechanical pulp, and mechanical pulp made from natural plant fibers in proportion and compound them into pulp. Mix the pulp with chemical additives and stir to obtain a pulp with a slurry concentration of 0.3% - 0.8%.

[0031] Further, the pulp includes 0 to 100 parts of chemical pulp, 0 to 100 parts of chemi-thermomechanical pulp, and 0 to 100 parts of mechanical pulp.

[0032] Further, the pulp includes 30 to 70 parts of chemical pulp, 20 to 50 parts of chemi-thermomechanical pulp, and 35 to 55 parts of mechanical pulp.

[0033] Further, the pulp includes 40 to 60 parts of chemical pulp, 25 to 35 parts of chemi-thermomechanical pulp, and 35 to 45 parts of mechanical pulp.

[0034] Further, the chemical additives include oil-proof agents, water-proof agents, moisture-proof agents, flame retardants, anti-fouling agents, non-wood fiber materials, and other acceptable chemical additives.

[0035] Further, the oil-proof agents are selected from products such as TG8811 and AG-E860.

[0036] Further, the water-proof agents are selected from AKD, acrylate, etc.

[0037] Further, the moisture-proof agents are selected from nitro paint moisture-proof agents, perchloroethylene paint moisture-proof agents, etc.

[0038] Further, the flame retardants are selected from nitro paint moisture-proof agents, perchloroethylene paint moisture-proof agents, etc.

[0039] Further, the anti-fouling agents are selected from environment-friendly and highly efficient CPC anti-fouling agents, etc.

[0040] Further, the non-wood fiber materials are selected from reed, rice straw, corn straw, bagasse, etc.

[0041] (2) Under the conditions of a vacuum degree of -0.05 to 0.08 Mpa, an auxiliary oil pressure or air pressure, and a mechanical pressure of 0 t to 300 t, the slurry is placed in a forming mold by suction or grouting, and then the slurry is dewatered to obtain a green body with a water content of 60 to 70%.

[0042] (3) The green body is transferred to a heat setting mold, and under the conditions of a temperature of 120°C to 250°C, a vacuum degree of -0.05 to 0.08 Mpa, an auxiliary oil pressure or air pressure, and a mechanical pressure of 30 t to 300 t, the green body is dried and set to obtain a dry blank with a water content of 0 to 8%.

[0043] Further, the above preparation method further includes surface spraying or roll coating: spraying PLA film on the surface of the green body and / or dry blank or roll coating with required chemical additives to increase strength or performance indicators. The order of this step can be flexibly adjusted according to the type of additives, and it can be between step (2) and (3), or after step (3).

[0044] Further, the above preparation method further includes trimming and shaping: trimming and shaping are achieved under a pressure of 0 to 100 t, including all forms of trimming.

[0045] Further, based on the weight of absolutely dry pulp, the pulp molding product is mainly made of 80 to 100 parts of pulp and 0 to 20 parts of chemical additives.

[0046] Further, based on the weight of absolutely dry pulp, the pulp molding product is mainly made of 90 to 100 parts of pulp, 0 to 1 part of oil-proof agent, and 0 to 1 part of waterproof agent.

[0047] Further, based on the weight of absolutely dry pulp, the pulp molding product is mainly made of 82 to 89 parts of pulp, 1 to 2 parts of oil-proof agent, 1 to 1.5 parts of waterproof agent, 2 to 2.5 parts of moisture-proof agent, 3 to 4 parts of flame retardant, and 5 to 10 parts of non-wood fiber material.

[0048] Example 1

[0049] 40 parts of chemical pulp, 25 parts of chemi-thermomechanical pulp, and 35 parts of mechanical pulp are taken to prepare pulp. 99 parts of pulp are mixed and stirred with 0.5 part of oil-proof agent and 0.5 part of waterproof agent to obtain a pulp with a pulp concentration of 0.3%.

[0050] Under the conditions of a vacuum degree of -0.08 Mpa, auxiliary hydraulic pressure or air pressure, and a mechanical pressure of 300 t, the pulp is placed in a molding die by suction or injection, and then the pulp is dehydrated to obtain a wet blank with a water content of 80%.

[0051] The wet blank is transferred to a heat setting die, and under the conditions of a temperature of 120 °C, a vacuum degree of -0.08 Mpa, auxiliary hydraulic pressure or air pressure, and a mechanical pressure of 60 t, the wet blank is dried and shaped to obtain a dry blank with a water content of 8%. The product is obtained after surface spraying or roll coating and trimming and shaping.

[0052] After testing, data such as the dimensional deviation, capacity deviation, water leakage, temperature resistance, cup body stiffness, load-bearing performance, compressive performance, folding test of the box cover, drop test, and delivery moisture of the product are obtained.

[0053] Testing method: GB / T 36787-2018 "Pulp Molding Tableware"

[0054]

[0055] Example 2

[0056] 10 parts of chemical pulp, 60 parts of chemi-thermomechanical pulp, and 40 parts of mechanical pulp are taken to prepare pulp. 95 parts of pulp are mixed and stirred with 0.1 part of oil-proof agent and 0.1 part of waterproof agent to obtain a pulp with a pulp concentration of 0.5%.

[0057] Under the conditions of a vacuum degree of -0.05 Mpa, auxiliary oil pressure or air pressure, and a mechanical pressure of 50 t, the slurry is placed in a forming mold by suction or grouting, and then the slurry is dehydrated to obtain a green body with a water content of 59%.

[0058] Transfer the green body to a heat setting mold, and under the conditions of a temperature of 180 °C, a vacuum degree of -0.05 Mpa, auxiliary oil pressure or air pressure, and a mechanical pressure of 50 t, dry and shape the green body to obtain a dry body with a water content of 6%. After surface spraying or roll coating and edge trimming and shaping, products (such as tableware, wall panels, ceiling panels, industrial packages, etc.) are obtained.

[0059] After testing, the product has dimensional deviation, capacity deviation, water leakage, temperature resistance performance, cup body stiffness, load-bearing performance, compressive performance, box cover folding test, drop test, delivery moisture content, etc.

[0060]

[0061] Example 3

[0062] Take 20 parts of chemical pulp, 10 parts of chemi-thermomechanical pulp, and 70 parts of mechanical pulp to prepare pulp. Mix and stir 98 parts of pulp with 1 part of oil-proof agent and 1 part of waterproof agent to obtain a slurry with a slurry concentration of 0.8%.

[0063] Under the conditions of a vacuum degree of -0.02 Mpa, auxiliary oil pressure or air pressure, and a mechanical pressure of 30 t, the slurry is placed in a forming mold by suction or grouting, and then the slurry is dehydrated to obtain a green body with a water content of 49%.

[0064] Transfer the green body to a heat setting mold, and under the conditions of a temperature of 250 °C, a vacuum degree of -0.02 Mpa, auxiliary oil pressure or air pressure, and a mechanical pressure of 60 t, dry and shape the green body to obtain a dry body with a water content of 2%. After surface spraying or roll coating and edge trimming and shaping, products (such as tableware, wall panels, ceiling panels, industrial packages, etc.) are obtained.

[0065] After testing, the product has dimensional deviation, capacity deviation, water leakage, temperature resistance performance, cup body stiffness, load-bearing performance, compressive performance, box cover folding test, drop test, delivery moisture content, etc.

[0066]

[0067]

[0068] Example 4

[0069] Mix and stir 99 parts of chemical pulp with 0.5 parts of oil-proof agent and 0.5 parts of waterproof agent to obtain a slurry with a slurry concentration of 0.3%.

[0070] Under the conditions of a vacuum degree of -0.05 Mpa, auxiliary oil pressure or air pressure, and mechanical pressure of 30 t, the slurry is placed in a forming mold by suction or grouting, and then the slurry is dehydrated to obtain a green body with a water content of 70%.

[0071] Transfer the green body to a heat setting mold, and under the conditions of a temperature of 50 °C, a vacuum degree of -0.05 Mpa, auxiliary oil pressure or air pressure, and mechanical pressure of 60 t, dry and shape the green body to obtain a dry body with a water content of 7%. After surface spraying or roll coating and trimming and shaping, products (such as tableware, wall panels, ceiling panels, industrial packages, etc.) are obtained.

[0072] After testing, the product has dimensional deviation, capacity deviation, water leakage, temperature resistance, cup body stiffness, load-bearing performance, compressive performance, box cover folding test, drop test, delivery moisture, etc.

[0073]

[0074] Example 5

[0075] Mix 79 parts of chemical pulp, 20 parts of chemi-thermomechanical pulp, 0.5 part of oil-proof agent, and 0.5 part of waterproof agent and stir to obtain a slurry with a slurry concentration of 0.3%.

[0076] Under the conditions of a vacuum degree of -0.05 Mpa, auxiliary oil pressure or air pressure, and mechanical pressure of 30 t, the slurry is placed in a forming mold by suction or grouting, and then the slurry is dehydrated to obtain a green body with a water content of 70%.

[0077] Transfer the green body to a heat setting mold, and under the conditions of a temperature of 50 °C, a vacuum degree of -0.05 Mpa, auxiliary oil pressure or air pressure, and mechanical pressure of 60 t, dry and shape the green body to obtain a dry body with a water content of 7%. After surface spraying or roll coating and trimming and shaping, products (such as tableware, wall panels, ceiling panels, industrial packages, etc.) are obtained.

[0078] After testing, the product has dimensional deviation, capacity deviation, water leakage, temperature resistance, cup body stiffness, load-bearing performance, compressive performance, box cover folding test, drop test, delivery moisture, etc.

[0079]

[0080] Example 6

[0081] Mix 79 parts of chemical pulp, 20 parts of mechanical pulp, 0.5 part of oil-proof agent, and 0.5 part of waterproof agent and stir to obtain a slurry with a slurry concentration of 0.3%.

[0082] Under the conditions of a vacuum degree of -0.05 Mpa, auxiliary oil pressure or air pressure, and mechanical pressure of 30 t, the slurry is placed in a forming mold by suction or grouting, and then the slurry is dehydrated to obtain a green body with a water content of 70%.

[0083] Transfer the green body to a heat setting mold, and under the conditions of a temperature of 50 °C, a vacuum degree of -0.05 Mpa, auxiliary oil pressure or air pressure, and mechanical pressure of 60 t, dry and shape the green body to obtain a dry body with a water content of 7%. After surface spraying or roll coating and trimming and shaping, products (such as tableware, wall panels, ceiling panels, industrial packaging, etc.) are obtained.

[0084] After testing, the product has dimensional deviation, capacity deviation, water leakage, temperature resistance, cup body stiffness, load-bearing performance, compressive performance, box cover folding test, drop test, delivery moisture, etc.

[0085]

[0086]

[0087] Example 7

[0088] Mix 95 parts of chemical pulp with 1 part of oil-proof agent, 1 part of waterproof agent, 1 part of moisture-proof agent, 1 part of flame retardant, and 1 part of anti-fouling agent and stir to obtain a slurry with a slurry concentration of 1%.

[0089] Under the conditions of a vacuum degree of -0.05 Mpa, auxiliary oil pressure or air pressure, and mechanical pressure of 60 t, the slurry is placed in a forming mold by suction or grouting, and then the slurry is dehydrated to obtain a green body with a water content of 70%.

[0090] Transfer the green body to a heat setting mold, and under the conditions of a temperature of 50 °C, a vacuum degree of -0.05 Mpa, auxiliary oil pressure or air pressure, and mechanical pressure of 60 t, dry and shape the green body to obtain a dry body with a water content of 7%. After surface spraying or roll coating and trimming and shaping, products (such as wall panels, ceiling panels, industrial packaging, etc.) are obtained.

[0091] After testing, the product has dimensional deviation, water leakage, temperature resistance, delivery moisture, etc.

[0092]

[0093] Example 8

[0094] Mix 95 parts of mechanical pulp with 1 part of oil-proof agent, 1 part of waterproof agent, 1 part of moisture-proof agent, 1 part of flame retardant, and 1 part of anti-fouling agent and stir to obtain a slurry with a slurry concentration of 1%.

[0095] Under the conditions of a vacuum degree of -0.05 Mpa, auxiliary oil pressure or air pressure, and mechanical pressure of 60 t, the slurry is placed in a forming mold by suction or grouting, and then the slurry is dehydrated to obtain a green body with a water content of 70%.

[0096] Transfer the green body to a heat setting mold, and under the conditions of a temperature of 50 °C, a vacuum degree of -0.05 Mpa, auxiliary oil pressure or air pressure, and mechanical pressure of 60 t, dry and shape the green body to obtain a dry body with a water content of 7%. After surface spraying or roll coating and edge trimming and shaping, products (wall panels, ceilings, industrial packages, etc.) are obtained.

[0097] After testing, the product has dimensional deviation, water leakage, temperature resistance performance, delivery moisture, etc.

[0098]

[0099] Example 9

[0100] Take 70 parts of chemical pulp and 30 parts of chemi-thermomechanical pulp to prepare pulp. Mix and stir 98 parts of pulp with 1 part of oil-proof agent and 1 part of waterproof agent to obtain a slurry with a slurry concentration of 0.3%.

[0101] Under the conditions of a vacuum degree of -0.05 Mpa, auxiliary oil pressure or air pressure, and mechanical pressure of 60 t, the slurry is placed in a forming mold by suction or grouting, and then the slurry is dehydrated to obtain a green body with a water content of 70%.

[0102] Transfer the green body to a heat setting mold, and under the conditions of a temperature of 50 °C, a vacuum degree of 0.05 Mpa, auxiliary oil pressure or air pressure, and mechanical pressure of 50 t, dry and shape the green body to obtain a dry body with a water content of 7%. After surface spraying or roll coating and edge trimming and shaping, products (tableware, wall panels, ceilings, industrial packages, etc.) are obtained.

[0103] After testing, the product has dimensional deviation, volume deviation, water leakage, temperature resistance performance, cup body stiffness, load-bearing performance, compressive performance, box cover folding test, drop test, delivery moisture, etc.

[0104]

[0105] Example 10

[0106] Take 70 parts of chemical pulp and 30 parts of mechanical pulp to prepare pulp. Mix and stir 98 parts of pulp with 1 part of oil-proof agent and 1 part of waterproof agent to obtain a slurry with a slurry concentration of 0.3%.

[0107] Under the conditions of a vacuum degree of -0.05 Mpa, auxiliary oil pressure or air pressure, and mechanical pressure of 60 t, the slurry is placed in a forming mold by suction or grouting, and then the slurry is dehydrated to obtain a green body with a water content of 70%.

[0108] Transfer the wet blank to a heat setting mold, and under the conditions of a temperature of 50°C, a vacuum degree of -0.05 Mpa, auxiliary hydraulic pressure or air pressure, and a mechanical pressure of 50 t, dry and shape the wet blank to obtain a dry blank with a water content of 7%. After surface spraying or roll coating and edge trimming and shaping, products (such as tableware, wall panels, ceiling panels, industrial packages, etc.) are obtained.

[0109] After testing, the product has dimensional deviation, capacity deviation, water leakage, temperature resistance, cup body stiffness, load-bearing performance, compressive performance, box cover folding test, drop test, delivery moisture content, etc.

[0110]

[0111] Example 11

[0112] Take 70 parts of chemi-thermomechanical pulp and 30 parts of mechanical pulp to prepare pulp, and mix and stir 95 parts of pulp with 1 part of oil-proof agent, 1 part of waterproof agent, 1 part of moisture-proof agent, 1 part of flame retardant, and 1 part of anti-fouling agent to obtain a pulp with a pulp concentration of 1%.

[0113] Under the conditions of a vacuum degree of -0.05 Mpa, auxiliary hydraulic pressure or air pressure, and a mechanical pressure of 60 t, place the pulp into a forming mold by suction or injection, and then dehydrate the pulp to obtain a wet blank with a water content of 70%.

[0114] Transfer the wet blank to a heat setting mold, and under the conditions of a temperature of 50°C, a vacuum degree of -0.05 Mpa, auxiliary hydraulic pressure or air pressure, and a mechanical pressure of 50 t, dry and shape the wet blank to obtain a dry blank with a water content of 7%. After surface spraying or roll coating and edge trimming and shaping, products (such as wall panels, ceiling panels, industrial packages, etc.) are obtained.

[0115] After testing, the product has dimensional deviation, capacity deviation, water leakage, temperature resistance, cup body stiffness, load-bearing performance, compressive performance, box cover folding test, drop test, delivery moisture content, etc.

[0116]

[0117]

[0118] Comparative Example 1

[0119] Mix and stir 98 parts of chemical pulp with 1 part of oil-proof agent and 1 part of waterproof agent to obtain a pulp with a pulp concentration of 0.8%.

[0120] Under the conditions of a vacuum degree of -0.02 Mpa, auxiliary hydraulic pressure or air pressure, and a mechanical pressure of 30 t, place the pulp into a forming mold by suction or injection, and then dehydrate the pulp to obtain a wet blank with a water content of 60%.

[0121] Transfer the wet blank to a hot setting mold, and under the conditions of a temperature of 60°C, a vacuum degree of -0.02 Mpa, and an auxiliary hydraulic pressure or air pressure and a mechanical pressure of 60 t, dry and shape the wet blank to obtain a dry blank with a water content of 2%. After surface spraying or roll coating and edge trimming and shaping, the product is obtained.

[0122] After testing, the product has dimensional deviation, capacity deviation, water leakage, temperature resistance, cup body stiffness, load-bearing performance, compressive performance, folding test of the box cover, drop test, delivery moisture, etc.

[0123]

[0124] Comparative Example 2

[0125] Mix 95 parts of chemical pulp with 0.1 part of oil-proof agent and 0.1 part of waterproof agent and stir to obtain a pulp with a pulp concentration of 5%.

[0126] Under the conditions of a vacuum degree of -0.05 Mpa, an auxiliary hydraulic pressure or air pressure and a mechanical pressure of 50 t, place the pulp into a forming mold by suction or grouting, and then dehydrate the pulp to obtain a wet blank with a water content of 65%.

[0127] Transfer the wet blank to a hot setting mold, and under the conditions of a temperature of 180°C, a vacuum degree of -0.05 Mpa, and an auxiliary hydraulic pressure or air pressure and a mechanical pressure of 50 t, dry and shape the wet blank to obtain a dry blank with a water content of 6%. After surface spraying or roll coating and edge trimming and shaping, the product is obtained.

[0128] After testing, the product has dimensional deviation, capacity deviation, water leakage, temperature resistance, cup body stiffness, load-bearing performance, compressive performance, folding test of the box cover, drop test, delivery moisture, etc.

[0129]

[0130] Comparative Example 3

[0131] Mix 90 parts of mechanical pulp with 0.5 part of oil-proof agent and 0.5 part of waterproof agent and stir to obtain a pulp with a pulp concentration of 0.3%.

[0132] Under the conditions of a vacuum degree of -0.08 Mpa, an auxiliary hydraulic pressure or air pressure and a mechanical pressure of 300 t, place the pulp into a forming mold by suction or grouting, and then dehydrate the pulp to obtain a wet blank with a water content of 70%.

[0133] Transfer the wet blank to a heat setting mold, and under the conditions of a temperature of 110°C, a vacuum degree of -0.08 Mpa, auxiliary hydraulic pressure or air pressure, and a mechanical pressure of 60 t, dry and shape the wet blank to obtain a dry blank with a water content of 8%. After surface spraying or roll coating and trimming and shaping, the product is obtained.

[0134] After testing, the product has dimensional deviation, capacity deviation, water leakage, temperature resistance, cup body stiffness, load-bearing performance, compressive performance, folding test of the box cover, drop test, delivery moisture, etc.

[0135]

[0136]

[0137] Comparative Example 4

[0138] Mix 99 parts of chemical pulp with 0.5 parts of oil-proof agent and 0.5 parts of waterproof agent and stir to obtain a slurry with a slurry concentration of 0.3%.

[0139] Under the conditions of a vacuum degree of -0.05 Mpa, auxiliary hydraulic pressure or air pressure, and a mechanical pressure of 30 t, place the slurry into a forming mold by suction or grouting, and then dehydrate the slurry to obtain a wet blank with a water content of 70%.

[0140] Transfer the wet blank to a heat setting mold, and under the conditions of a temperature of 50°C, a vacuum degree of -0.05 Mpa, auxiliary hydraulic pressure or air pressure, and a mechanical pressure of 10 t, dry and shape the wet blank to obtain a dry blank with a water content of 7%. After surface spraying or roll coating and trimming and shaping, the product (tableware, wall panels, ceiling, industrial packaging, etc.) is obtained.

[0141] After testing, the product has dimensional deviation, capacity deviation, water leakage, temperature resistance, cup body stiffness, load-bearing performance, compressive performance, folding test of the box cover, drop test, delivery moisture, etc.

[0142]

[0143] Comparative Example 5

[0144] Mix 95 parts of chemi-thermomechanical pulp with 1 part of oil-proof agent, 1 part of waterproof agent, 1 part of moisture-proof agent, 1 part of flame retardant, and 1 part of anti-fouling agent and stir to obtain a slurry with a slurry concentration of 1%.

[0145] Under the conditions of a vacuum degree of -0.05 Mpa, auxiliary hydraulic pressure or air pressure, and a mechanical pressure of 60 t, place the slurry into a forming mold by suction or grouting, and then dehydrate the slurry to obtain a wet blank with a water content of 70%.

[0146] Transfer the wet blank to a hot setting mold, and under the conditions of a temperature of 50°C, a vacuum of -0.05 Mpa, auxiliary hydraulic or pneumatic pressure, and a mechanical pressure of 20 t, dry and shape the wet blank to obtain a dry blank with a water content of 7%. After surface spraying or roll coating and trimming and shaping, products (wall panels, ceiling panels, industrial packages, etc.) are obtained.

[0147] After testing, the dimensional deviation, water leakage, temperature resistance, delivery moisture, etc. of the product.

[0148]

[0149] Comparative Example 6

[0150] Mix and stir 95 parts of mechanical pulp with 1 part of oil-proof agent, 1 part of waterproof agent, 1 part of moisture-proof agent, 1 part of flame retardant, and 1 part of anti-fouling agent to obtain a pulp with a pulp concentration of 1%.

[0151] Under the conditions of a vacuum of -0.03 Mpa, auxiliary hydraulic or pneumatic pressure, and a mechanical pressure of 60 t, place the pulp into a forming mold by suction or grouting, and then dehydrate the pulp to obtain a wet blank with a water content of 70%.

[0152] Transfer the wet blank to a hot setting mold, and under the conditions of a temperature of 50°C, a vacuum of -0.05 Mpa, auxiliary hydraulic or pneumatic pressure, and a mechanical pressure of 20 t, dry and shape the wet blank to obtain a dry blank with a water content of 7%. After surface spraying or roll coating and trimming and shaping, products (wall panels, ceiling panels, industrial packages, etc.) are obtained.

[0153] After testing, the dimensional deviation, water leakage, temperature resistance, delivery moisture, etc. of the product.

[0154]

[0155] Comparative Example 7

[0156] Take 70 parts of chemical pulp and 30 parts of chemi-thermomechanical pulp to prepare pulp, and mix and stir 98 parts of pulp with 1 part of oil-proof agent and 1 part of waterproof agent to obtain a pulp with a pulp concentration of 0.3%.

[0157] Under the conditions of a vacuum of -0.03 Mpa, auxiliary hydraulic or pneumatic pressure, and a mechanical pressure of 60 t, place the pulp into a forming mold by suction or grouting, and then dehydrate the pulp to obtain a wet blank with a water content of 70%.

[0158] Transfer the wet blank to a hot setting mold, and under the conditions of a temperature of 50°C, a vacuum of -0.03 Mpa, auxiliary hydraulic or pneumatic pressure, and a mechanical pressure of 20 t, dry and shape the wet blank to obtain a dry blank with a water content of 7%. After surface spraying or roll coating and trimming and shaping, products (tableware, wall panels, ceiling panels, industrial packages, etc.) are obtained.

[0159] After inspection, the dimensional deviation, capacity deviation, water leakage, temperature resistance, cup body stiffness, load-bearing performance, compressive performance, folding test of the box cover, drop test, delivery moisture content, etc. of the product.

[0160]

[0161] Comparative Example 8

[0162] 70 parts of chemical pulp and 30 parts of mechanical pulp are used to prepare pulp. 98 parts of pulp are mixed and stirred with 1 part of oil-proof agent and 1 part of waterproof agent to obtain a pulp with a pulp concentration of 0.3%.

[0163] Under the conditions of a vacuum degree of -0.05 Mpa, auxiliary oil pressure or air pressure, and a mechanical pressure of 60 t, the pulp is placed in a forming mold by suction or injection, and then the pulp is dehydrated to obtain a wet blank with a water content of 70%.

[0164] Transfer the wet blank to a heat setting mold, and under the conditions of a temperature of 50 °C, a vacuum degree of -0.05 Mpa, auxiliary oil pressure or air pressure, and a mechanical pressure of 20 t, dry and shape the wet blank to obtain a dry blank with a water content of 7%. After surface spraying or roll coating and edge trimming and shaping, the product (tableware, wall panels, ceiling, industrial packaging, etc.) is obtained.

[0165] After inspection, the dimensional deviation, capacity deviation, water leakage, temperature resistance, cup body stiffness, load-bearing performance, compressive performance, folding test of the box cover, drop test, delivery moisture content, etc. of the product.

[0166]

[0167]

[0168] Comparative Example 9

[0169] 70 parts of chemi-thermomechanical pulp and 30 parts of mechanical pulp are used to prepare pulp. 95 parts of pulp are mixed and stirred with 1 part of oil-proof agent, 1 part of waterproof agent, 1 part of moisture-proof agent, 1 part of flame retardant, and 1 part of anti-fouling agent to obtain a pulp with a pulp concentration of 1%.

[0170] Under the conditions of a vacuum degree of -0.05 Mpa, auxiliary oil pressure or air pressure, and a mechanical pressure of 60 t, the pulp is placed in a forming mold by suction or injection, and then the pulp is dehydrated to obtain a wet blank with a water content of 70%.

[0171] Transfer the wet blank to a heat setting mold, and under the conditions of a temperature of 50°C, a vacuum degree of 0.03 Mpa, auxiliary hydraulic pressure or air pressure, and a mechanical pressure of 20 t, dry and shape the wet blank to obtain a dry blank with a water content of 7%. After surface spraying or roll coating and edge trimming and shaping, products (wall panels, ceiling panels, industrial packages, etc.) are obtained.

[0172] After testing, the product has dimensional deviation, volume deviation, water leakage, temperature resistance, cup body stiffness, load-bearing performance, compressive performance, folding test of the box cover, drop test, delivery moisture content, etc.

[0173]

[0174] By comparing the data of the examples and the comparative examples, it can be seen that the performance of the examples such as dimensional deviation, volume deviation, water leakage, temperature resistance, cup body stiffness, load-bearing performance, compressive performance, folding test of the box cover, drop test, delivery moisture content, etc. is better than that of the comparative examples. The parameters within the technical requirement conditions can meet the production of all tableware, wall panels, ceiling panels, and industrial packages. The parameters will vary for different major product categories, and the above production parameters also need to be adjusted for different sub-categories of products with different sizes, volumes, and shapes. Different products will have different optimal parameters.

[0175] The above has introduced the embodiments of the present application in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application. At the same time, any changes or deformations made by those skilled in the art based on the idea of the present application, within the specific implementation manner and application scope of the present application, fall within the protection scope of the present application. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A preparation method of a pulp molding product, characterized in that, the preparation method comprises: (1) Mixing and stirring pulp with chemical additives to obtain a slurry, and the concentration of the slurry is 0.3%; (2) Under the conditions of a vacuum degree of -0.05 Mpa and a mechanical pressure of 30 t to 60 t, putting the slurry into a molding die by means of suction or injection to dehydrate the slurry, and obtaining a wet blank with a water content of 70%; (3) Transferring the wet blank to a heat setting die, and performing drying and setting under the conditions of a temperature of 50 °C, a vacuum degree of -0.05 Mpa, and a mechanical pressure of 50 t to 60 t to obtain a dry blank, and the water content of the dry blank is 7%; (4) Spraying PLA film on the surface of the wet blank and / or dry blank or roll-coating the chemical additives; wherein, the chemical additives are oil-proof agent and water-proof agent; It is made of 99 parts of the pulp, 0.5 part of the oil-proof agent, and 0.5 part of the water-proof agent based on the weight of the absolutely dry pulp. Among them, the pulp comprises 79 parts of chemical pulp and 20 parts of chemi-mechanical pulp or mechanical pulp.

2. The preparation method according to claim 1, characterized in that, the preparation method further comprises: trimming and shaping under a pressure of 0 to 100 t.

3. A pulp molding product, characterized in that, it is made by the preparation method according to any one of claims 1-2.

Images