Natural degradable biomass packaging material and preparation method thereof

Abstract

The invention discloses a natural degradable biomass packaging material and a preparation method thereof. The method comprises the following steps: step 1, weighing raw materials in proportion; the raw materials comprise raw materials for preparing primary pulp fibers, starch, shell powder, auxiliaries and water; step 2, preparing primary pulp fibers; step 3, adding starch, shell powder, an auxiliary agent and water into the primary pulp fiber obtained in the step 2, heating and mixing, and uniformly stirring; step 4, heating and extruding the primary pulp fiber mixture obtained in the step 3, and cutting into a cylindrical cake shape for later use; and step 5, molding the cylindrical cake obtained in the step 4 through a preset mold, and heating and drying. The invention also provides the natural degradable biomass packaging material prepared by the method. According to the natural and degradable biomass packaging material and the preparation method thereof provided by the invention, a new natural and degradable biomass material is adopted to replace an existing non-degradable material, so that pollution can be reduced, and real environmental protection and natural degradation are realized.

Description

Technical Field

[0001] The invention relates to a new biodegradable material and a preparation method thereof, and in particular to a natural degradable biomass packaging material and a preparation method thereof. Background Art

[0002] Expanded polystyrene (EPS) is a lightweight material with good thermal insulation performance. It has excellent properties such as light weight, heat insulation, sound absorption, and shock resistance. It is widely used in construction, packaging, handicrafts, cold chain logistics and other fields. It has the characteristics of low density and high strength. At the same time, EPS foam material has good thermal insulation and heat preservation properties. In the packaging field, EPS foam material is often used in the packaging of electronic products, home appliances, etc., which can effectively protect the products from damage. However, it has certain dangers, mainly manifested in:

[0003] 1. Release toxic substances. EPS contains harmful substances such as styrene monomer and foaming agent. Long-term contact is harmful to the human body.

[0004] 2. It causes environmental pollution. EPS has a certain volatility. Over time, it will release a large amount of harmful gases and chemicals, causing environmental pollution.

[0005] 3. It is non-degradable. EPS is made into various cushioning packaging materials. After being discarded in large quantities, it may take decades or even hundreds of years to degrade, causing major environmental problems.

[0006] Since the market is currently dominated by traditional EPS foam packaging products, this material is non-degradable and does not meet policy requirements, so there is an urgent need for natural degradable materials to replace this non-degradable material.

[0007] Plant fiber is made by blasting and processing crop straw, rice straw, reed and other herbaceous plants, or waste materials such as sugarcane bagasse and sawdust. The fiber is a natural renewable and biodegradable material. The packaging made of it has the advantages of being renewable, biodegradable, low cost and widely available. Therefore, environmentally friendly packaging products made of plant fiber have become the focus of people's attention. Summary of the invention

[0008] The purpose of the present invention is to provide a natural biodegradable foam packaging material and a preparation method thereof, which can solve the problems of the prior art, adopt natural biodegradable biomass materials to replace non-degradable materials, can reduce pollution, and achieve true environmental protection and natural degradation.

[0009] In order to achieve the above-mentioned purpose, the present invention provides a method for preparing a natural and degradable biomass packaging material, wherein the method comprises: step 1, weighing each raw material in proportion; step 2, preparing raw pulp fiber; step 3, adding starch, shell powder, additives and water to the raw pulp fiber obtained in step 2, heating and mixing, and stirring evenly; step 4, heating and extruding the raw pulp fiber mixture obtained in step 3, and cutting it into cylindrical cakes for standby use; step 5, forming the cylindrical cakes obtained in step 4 through a predetermined mold and then heating and drying.

[0010] The method for preparing the above-mentioned natural degradable biomass packaging material, wherein in the step 2, the raw pulp fiber is prepared by crushing straw, rice straw, reed, bagasse and sawdust, mixing them evenly in any proportion, and then steam explosion, and the explosion temperature is 300℃±10℃.

[0011] The preparation method of the above-mentioned natural degradable biomass packaging material, wherein, in the step 3, the raw pulp fiber obtained by steam explosion and starch, shell powder, additives and water are added to a mixer, the predetermined heating temperature is 50-60°C, and while heating, the mixture is stirred at a low speed of 80-100 rpm for 5-8 minutes to be evenly mixed; in terms of mass percentage, the total amount of starch, shell powder, additives and water is 46-58% of the raw pulp fiber mixture.

[0012] In the method for preparing the above-mentioned natural degradable biomass packaging material, in the step 3, deionized water is used, and the amount used is 30-35% of the original pulp fiber mixture by mass percentage.

[0013] In the method for preparing the above-mentioned natural degradable biomass packaging material, the starch is corn starch and / or cassava starch, and the amount used is 10%-15% of the original pulp fiber mixture by mass percentage.

[0014] The method for preparing the above-mentioned natural degradable biomass packaging material, wherein the shell powder is obtained by grinding the shells into powder with a particle size of 600-1000 meshes, and the amount used is 5%-8% of the original pulp fiber mixture by mass percentage.

[0015] The preparation method of the above-mentioned natural degradable biomass packaging material, wherein the auxiliary agent includes a cross-linking agent and a stabilizer; the cross-linking agent is any one of sodium trimetaphosphate, epichlorohydrin, and borax, and the amount used is 0.06%-0.1% of the original pulp fiber mixture by mass percentage; the stabilizer is any one of chitosan and lead stearate, and the amount used is 0.03%-0.05% of the original pulp fiber mixture by mass percentage.

[0016] The method for preparing the above-mentioned natural degradable biomass packaging material, wherein, in the step 4, the premixed raw pulp fiber mixture is added to the twin-screw extruder, the heating temperatures of the twin-screw extruder are 50°C, 55°C, and 60°C, respectively, the twin-screw extruder is started, and the raw pulp fiber mixture is extruded out of the die head, and an online metering device is also provided at the die head to cut the extruded raw pulp fiber mixture into cylindrical cakes of required weight.

[0017] The method for preparing the above-mentioned natural degradable biomass packaging material, wherein, in the step 5, the cylindrical cake is transported to a molding system consisting of a heating device, a manipulator and a mold by a conveyor belt, the cylindrical cake is first placed in a mold made according to a predetermined specification and size, pressed and shaped, and then the obtained molded product of the raw pulp fiber mixture is heated by a heating device at a temperature of 150-165°C. The moisture content of the heated raw pulp fiber mixture is 5-8% by mass percentage, and finally the heated molded product is clamped by a manipulator and placed in an oven for further drying.

[0018] The present invention also provides a natural degradable biomass packaging material prepared by the above method.

[0019] The natural degradable biomass packaging material and the preparation method thereof provided by the present invention have the following advantages:

[0020] The raw pulp fiber, starch and shell powder used in the present invention are all natural materials, which have the advantages of environmental protection and carbon reduction, and are natural biological materials with good environmental protection. Therefore, the prepared biomass foam packaging products have the advantages of environmental protection, soil degradability, low price and excellent performance.

[0021] The preparation method of the invention is simple and easy to operate, and can prepare a natural biomass foaming packaging material which is completely degradable and has excellent mechanical properties. DETAILED DESCRIPTION

[0022] The specific embodiments of the present invention are further described below.

[0023] The method for preparing a natural degradable biomass packaging material provided by the present invention comprises: step 1, weighing various raw materials in proportion; the raw materials comprise raw materials for preparing raw pulp fibers, as well as starch, shell powder, additives and water; step 2, preparing raw pulp fibers; step 3, adding starch, shell powder, additives and water to the raw pulp fibers obtained in step 2, heating and mixing, and stirring evenly; step 4, heating and extruding the raw pulp fiber mixture obtained in step 3, and cutting it into cylindrical cakes for standby use; step 5, forming the cylindrical cakes obtained in step 4 through a predetermined mold and then heating and drying them.

[0024] Preferably, the raw pulp fiber in step 2 is prepared by crushing straw, rice straw, reed, bagasse and sawdust, etc., mixing them uniformly in any proportion, and then steam explosion, and the explosion temperature is 300°C±10°C.

[0025] In step 3, the raw pulp fiber obtained by steam explosion, starch, shell powder, additives and water are added to a mixer, the predetermined heating temperature is 50-60°C, and the mixture is stirred at a low speed of 80-100 rpm for 5-8 minutes while being heated to mix evenly.

[0026] Calculated by mass percentage, the total amount of starch, shell powder, additives and water is 46-58% of the original pulp fiber mixture.

[0027] Deionized water is used as water, and the amount used is 30-35% of the original pulp fiber mixture by mass percentage.

[0028] The starch is corn starch and / or cassava starch, and acts as a binder in the raw pulp fiber mixture. The starch is used in an amount of 10%-15% of the raw pulp fiber mixture by mass percentage.

[0029] Shell powder is obtained by grinding shells into fine powder with a particle size of 600-1000 meshes. It acts as a reinforcing agent in the raw fiber mixture. The amount of shell powder used is 5%-8% of the raw fiber mixture by mass percentage.

[0030] The auxiliary agents mainly include crosslinking agents and stabilizers; the crosslinking agent is any one of sodium trimetaphosphate, epichlorohydrin and borax, and its function in the raw pulp fiber mixture is to react with hydroxyl groups in starch to generate diether bonds or diester groups and other groups, thereby forming a polymer with a spatial network structure, and the amount of the crosslinking agent is 0.06%-0.1% of the raw pulp fiber mixture by mass percentage; the stabilizer is any one of chitosan and lead stearate, and its function in the raw pulp fiber mixture is to improve product stability and shelf life, and the amount of the stabilizer is 0.03%-0.05% of the raw pulp fiber mixture by mass percentage.

[0031] In step 4, the premixed raw fiber mixture is added into a twin-screw extruder, and the heating temperatures of the twin-screw extruder are 50° C., 55° C., and 60° C. respectively. The twin-screw extruder is started, and the raw fiber mixture is extruded out of a die head. An online metering device is also provided at the die head to cut the extruded raw fiber mixture into cylindrical cakes of a certain weight as needed.

[0032] In step 5, the cylindrical cake is transported to a forming system consisting of a heating device, a manipulator and a mold through a conveyor belt. First, the cylindrical cake is placed in a mold made according to predetermined specifications and dimensions, pressed and shaped, and then the obtained molded product of the raw pulp fiber mixture is heated by a heating device at a temperature of 150-165° C. The moisture content in the raw pulp fiber mixture after heating is 5-8% by mass. Finally, the heated molded product is clamped by a manipulator and placed in an oven for further drying until the required dryness of the finished product is reached.

[0033] The production equipment and other process conditions used in the present invention are known to those skilled in the art.

[0034] The invention also provides natural degradable biomass packaging material prepared by the method.

[0035] The natural degradable biomass packaging material and the preparation method thereof provided by the present invention are further described below in conjunction with the embodiments.

[0036] Example 1

[0037] A method for preparing a natural and degradable biomass packaging material, comprising:

[0038] Step 1, weigh each raw material according to proportion.

[0039] The raw materials include raw materials for preparing raw pulp fiber, starch, shell powder, additives and water.

[0040] Step 2, preparing raw pulp fibers.

[0041] The raw pulp fiber is prepared by crushing straw, rice straw, reed, bagasse and sawdust, mixing them uniformly in any proportion, and then steam-exploding them at a temperature of 300°C.

[0042] Step 3, adding starch, shell powder, additives and water to the raw fiber obtained in step 2, heating and mixing, and stirring evenly.

[0043] Preferably, the raw pulp fibers obtained by steam explosion, starch, shell powder, additives and water are added into a mixer, the predetermined heating temperature is 50° C., and the mixture is stirred at a low speed of 80 rpm for 5 minutes while being heated to be uniformly mixed.

[0044] Calculated by mass percentage, the total amount of starch, shell powder, additives and water is 47.1% of the original pulp fiber mixture.

[0045] Deionized water is used as water, and the amount of deionized water used is 30% of the original pulp fiber mixture by mass percentage.

[0046] The starch is corn starch, and the amount of the starch used is 12% of the original pulp fiber mixture by mass percentage.

[0047] Shell powder is obtained by grinding shells into powder with a particle size of 600 meshes. The amount of shell powder used is 5% of the original pulp fiber mixture by mass percentage.

[0048] Auxiliary agents include crosslinking agents and stabilizers.

[0049] The cross-linking agent is sodium trimetaphosphate, and the amount used is 0.06% of the original pulp fiber mixture by mass percentage.

[0050] The stabilizer is chitosan, and the amount of the stabilizer is 0.04% of the original pulp fiber mixture by mass percentage.

[0051] Step 4, heating and extruding the raw pulp fiber mixture obtained in step 3, and cutting it into cylindrical cakes for later use.

[0052] Preferably, the premixed raw fiber mixture is added into a twin-screw extruder, the heating temperatures of the twin-screw extruder are 50°C, 55°C, and 60°C, respectively, the twin-screw extruder is started, and the raw fiber mixture is extruded out of a die head, and an online metering device is also provided at the die head to cut the extruded raw fiber mixture into cylindrical cakes of required weight.

[0053] Step 5, forming the cylindrical cake obtained in step 4 through a predetermined mold and then heating and drying.

[0054] Preferably, the cylindrical cake is transported to a forming system consisting of a heating device, a robot and a mold by a conveyor belt. First, the cylindrical cake is placed in a mold made according to predetermined specifications and dimensions, pressed and shaped, and then the obtained molded product of the raw pulp fiber mixture is heated by a heating device at a temperature of 150°C. The moisture content of the raw pulp fiber mixture after heating is 5% by mass. Finally, the heated molded product is clamped by a robot and placed in an oven for further drying.

[0055] This embodiment also provides a natural degradable biomass packaging material prepared by the method.

[0056] The packaging material consists of 52.9% of raw pulp fiber, 30% of deionized water, 12% of corn starch, 5% of 600-mesh shell powder, 0.06% of sodium trimetaphosphate and 0.04% of chitosan, based on mass percentage.

[0057] Example 2

[0058] A method for preparing a natural and degradable biomass packaging material, comprising:

[0059] Step 1, weigh each raw material according to proportion.

[0060] The raw materials include raw materials for preparing raw pulp fiber, starch, shell powder, additives and water.

[0061] Step 2, preparing raw pulp fibers.

[0062] The raw pulp fiber is prepared by crushing straw, rice straw, reed, bagasse and wood chips, mixing them evenly in any proportion, and then steam-exploding them at a temperature of 310°C.

[0063] Step 3, adding starch, shell powder, additives and water to the raw fiber obtained in step 2, heating and mixing, and stirring evenly.

[0064] Preferably, the raw pulp fibers obtained by steam explosion, starch, shell powder, additives and water are added into a mixer, the predetermined heating temperature is 60° C., and the mixture is stirred at a low speed of 100 rpm for 8 minutes while being heated to be uniformly mixed.

[0065] Calculated by mass percentage, the total amount of starch, shell powder, additives and water is 54.13% of the original pulp fiber mixture.

[0066] Deionized water is used as water, and the amount of deionized water used is 33% of the original pulp fiber mixture by mass percentage.

[0067] The starch is cassava starch, and the amount of the starch used is 15% of the original pulp fiber mixture by mass percentage.

[0068] Shell powder is obtained by grinding shells into powder with a particle size of 800 meshes. The amount of shell powder used is 6% of the original pulp fiber mixture by mass percentage.

[0069] Auxiliary agents include crosslinking agents and stabilizers.

[0070] The cross-linking agent is epichlorohydrin, and the amount of the cross-linking agent used is 0.08% of the original pulp fiber mixture by mass percentage.

[0071] The stabilizer is lead stearate, and the amount of the stabilizer used is 0.05% of the original pulp fiber mixture by mass percentage.

[0072] Step 4, heating and extruding the raw pulp fiber mixture obtained in step 3, and cutting it into cylindrical cakes for later use.

[0073] Preferably, the premixed raw fiber mixture is added into a twin-screw extruder, the heating temperatures of the twin-screw extruder are 50°C, 55°C, and 60°C, respectively, the twin-screw extruder is started, and the raw fiber mixture is extruded out of a die head, and an online metering device is also provided at the die head to cut the extruded raw fiber mixture into cylindrical cakes of required weight.

[0074] Step 5, forming the cylindrical cake obtained in step 4 through a predetermined mold and then heating and drying.

[0075] Preferably, the cylindrical cake is transported to a forming system consisting of a heating device, a robot and a mold by a conveyor belt. First, the cylindrical cake is placed in a mold made according to predetermined specifications and dimensions, pressed and shaped, and then the obtained molded product of the raw pulp fiber mixture is heated by a heating device at a temperature of 165°C. The moisture content of the heated raw pulp fiber mixture is 7% by mass. Finally, the heated molded product is clamped by a robot and placed in an oven for further drying.

[0076] This embodiment also provides a natural degradable biomass packaging material prepared by the method.

[0077] The packaging material consists of, by mass percentage, 45.87% of raw pulp fiber, 33% of deionized water, 15% of cassava starch, 6% of 800-mesh shell powder, 0.08% of epichlorohydrin, and 0.05% of lead stearate.

[0078] Example 3

[0079] A method for preparing a natural and degradable biomass packaging material, comprising:

[0080] Step 1, weigh each raw material according to proportion.

[0081] The raw materials include raw materials for preparing raw pulp fiber, starch, shell powder, additives and water.

[0082] Step 2, preparing raw pulp fibers.

[0083] The raw pulp fiber is prepared by crushing straw, rice straw, reed, bagasse and sawdust, mixing them evenly in any proportion, and then steam-exploding them at a temperature of 290°C.

[0084] Step 3, adding starch, shell powder, additives and water to the raw fiber obtained in step 2, heating and mixing, and stirring evenly.

[0085] Preferably, the raw pulp fibers obtained by steam explosion, starch, shell powder, additives and water are added into a mixer, the predetermined heating temperature is 55° C., and the mixture is stirred at a low speed of 90 rpm for 6 minutes while being heated to be uniformly mixed.

[0086] Calculated by mass percentage, the total amount of starch, shell powder, additives and water is 53.13% of the original pulp fiber mixture.

[0087] Deionized water is used as water, and the amount of deionized water used is 35% of the original pulp fiber mixture by mass percentage.

[0088] The starch is obtained by mixing corn starch and cassava starch in any proportion. In terms of mass percentage, the amount of starch is 10% of the original pulp fiber mixture.

[0089] Shell powder is obtained by grinding shells into powder with a particle size of 1000 meshes. The amount of shell powder used is 8% of the original pulp fiber mixture by mass percentage.

[0090] Auxiliary agents include crosslinking agents and stabilizers.

[0091] The cross-linking agent is borax, and the amount of the cross-linking agent used is 0.1% of the original pulp fiber mixture by mass percentage.

[0092] The stabilizer is chitosan, and the amount of the stabilizer is 0.03% of the original pulp fiber mixture by mass percentage.

[0093] Step 4, heating and extruding the raw pulp fiber mixture obtained in step 3, and cutting it into cylindrical cakes for later use.

[0094] Preferably, the premixed raw fiber mixture is added into a twin-screw extruder, the heating temperatures of the twin-screw extruder are 50°C, 55°C, and 60°C, respectively, the twin-screw extruder is started, and the raw fiber mixture is extruded out of a die head, and an online metering device is also provided at the die head to cut the extruded raw fiber mixture into cylindrical cakes of required weight.

[0095] Step 5, forming the cylindrical cake obtained in step 4 through a predetermined mold and then heating and drying.

[0096] Preferably, the cylindrical cake is transported to a forming system consisting of a heating device, a robot and a mold by a conveyor belt. First, the cylindrical cake is placed in a mold made according to predetermined specifications and dimensions, pressed and shaped, and then the obtained molded product of the raw pulp fiber mixture is heated by a heating device at a temperature of 160°C. The moisture content of the raw pulp fiber mixture after heating is 8% by mass. Finally, the heated molded product is clamped by a robot and placed in an oven for further drying.

[0097] This embodiment also provides a natural degradable biomass packaging material prepared by the method.

[0098] The packaging material consists of 46.87% of raw pulp fiber, 35% of deionized water, 10% of a mixture of corn starch and cassava starch, 8% of 1000-mesh shell powder, 0.1% of borax and 0.03% of chitosan, based on mass percentage.

[0099] The natural degradable biomass packaging materials of each embodiment were used to prepare biomass foam packaging products, and the performance was compared with that of traditional EPS products. The test results are shown in Table 1 below.

[0100] Table 1. Performance comparison table.

[0101]

[0102] It can be seen from the above embodiments that the obtained natural degradable biomass packaging material has a higher density, lower tensile strength and elongation at break, and similar or slightly higher other properties than the traditional EPS material, and can meet the requirements of cushioning packaging products.

[0103] The natural degradable biomass packaging material and preparation method thereof provided by the present invention adopt raw materials including raw pulp fiber, starch and shell powder, etc., which are of natural source, easy to obtain in large quantity, can save cost, and can achieve complete degradation, which is beneficial to environmental protection. The plant fiber packaging products prepared by the material are potential substitutes for EPS disposable packaging, and have the advantages of low cost, environmental friendliness, and natural degradation. Among them, the straw fiber in the raw pulp fiber is a natural material widely existing in nature, with good natural antibacterial and mechanical properties. The prepared packaging products are non-toxic and easy to degrade, and also contribute to environmental protection. The cellulose of the raw pulp fiber obtained is also a natural material, which is renewable, degradable, cheap and good quality.

[0104] The invention focuses on using natural materials, and compared with the traditional polluting EPS, the main highlight is environmental protection and natural degradation. The preparation method is simple and easy to operate, and can prepare a natural biomass foam packaging material that can be completely degraded and has excellent mechanical properties.

[0105] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present invention will occur. Therefore, the protection scope of the present invention should be limited by the appended claims.

Claims

1. A method for preparing a natural and degradable biomass packaging material, characterized in that: The method comprises: Step 1, weigh each raw material according to proportion; Step 2, preparing raw pulp fibers; Step 3, adding starch, shell powder, additives and water to the raw fiber obtained in step 2, heating and mixing, and stirring evenly; Step 4, heating and extruding the raw pulp fiber mixture obtained in step 3, and cutting it into cylindrical cakes for later use; Step 5, forming the cylindrical cake obtained in step 4 through a predetermined mold and then heating and drying.

2. The method for preparing the natural degradable biomass packaging material according to claim 1, characterized in that: In the step 2, the raw pulp fiber is prepared by crushing straw, rice straw, reed, bagasse and sawdust, mixing them uniformly in any proportion, and then steam explosion, and the explosion temperature is 300°C±10°C.

3. The method for preparing the natural degradable biomass packaging material according to claim 1, characterized in that: In the step 3, the raw pulp fiber obtained by steam explosion and starch, shell powder, additives and water are added to a mixer, the predetermined heating temperature is 50-60°C, and the mixture is stirred at a low speed of 80-100 rpm for 5-8 minutes while heating to mix evenly; in terms of mass percentage, the total amount of starch, shell powder, additives and water is 46-58% of the raw pulp fiber mixture.

4. The method for preparing the natural degradable biomass packaging material according to claim 3, characterized in that: In step 3, deionized water is used as water, and the amount used is 30-35% of the original pulp fiber mixture by mass percentage.

5. The method for preparing the natural degradable biomass packaging material according to claim 3, characterized in that: The starch is corn starch and / or cassava starch, and the dosage is 10%-15% of the original pulp fiber mixture by mass percentage.

6. The method for preparing the natural degradable biomass packaging material according to claim 3, characterized in that: The shell powder is obtained by grinding shells into powder with a particle size of 600-1000 meshes, and the amount thereof is 5%-8% of the original pulp fiber mixture in terms of mass percentage.

7. The method for preparing the natural degradable biomass packaging material according to claim 3, characterized in that: The auxiliary agents include a crosslinking agent and a stabilizer; the crosslinking agent is any one of sodium trimetaphosphate, epichlorohydrin and borax, and its usage is 0.06%-0.1% of the original pulp fiber mixture by mass percentage; the stabilizer is any one of chitosan and lead stearate, and its usage is 0.03%-0.05% of the original pulp fiber mixture by mass percentage.

8. The method for preparing the natural degradable biomass packaging material according to claim 1, characterized in that: In the step 4, the premixed raw fiber mixture is added into a twin-screw extruder, the heating temperatures of the twin-screw extruder are 50° C., 55° C., and 60° C., respectively. The twin-screw extruder is started, and the raw fiber mixture is extruded out of a die head. An online metering device is also provided at the die head to cut the extruded raw fiber mixture into cylindrical cakes of required weight.

9. The method for preparing the natural degradable biomass packaging material according to claim 1, characterized in that: In the step 5, the cylindrical cake is transported to a forming system consisting of a heating device, a manipulator and a mold by a conveyor belt. The cylindrical cake is first placed in a mold made according to a predetermined specification and size, pressed and shaped, and then the obtained molded product of the raw pulp fiber mixture is heated by a heating device at a temperature of 150-165° C., and the moisture content of the raw pulp fiber mixture after heating is 5-8% by mass. Finally, the heated molded product is clamped by a manipulator and placed in an oven for further drying.

10. A natural degradable biomass packaging material prepared by the method according to any one of claims 1 to 9.

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