A method for manufacturing a packaging box using a pp tableware material nozzle and a product thereof

Abstract

The application relates to the technical field of recycled PP processing, in particular to a preparation method of a packaging box prepared from PP tableware material water gap and a product thereof, which comprises the following steps: low-temperature crushing of the PP tableware material water gap, cleaning with a weak alkaline cleaning solution, two-stage solvent extraction, flowing through a reaction channel provided with a TiO2 / activated carbon composite catalyst and injecting ozone to obtain pure PP, mixing the pure PP, brand-new PP, a reactive antioxidant and nano ZnO ultraviolet absorbent, injecting CO2 fluid, and finally injecting a three-zone gradient cooling mold to form the packaging box. Through the process, the compression strength, impact resistance, dimensional stability and aging resistance of the packaging box prepared from the water gap material can be improved, the problems of performance decline and unstable quality of the PP tableware material water gap in the preparation process of the packaging box can be effectively solved, and the strict requirements of the packaging box for protecting articles in the outdoor and transportation processes can be met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of recycling PP processing, more specifically, to a preparation method of a packaging box using PP tableware nozzle material and the product thereof. BACKGROUND

[0002] PP tableware nozzle material refers to the leftover or defective products generated during the injection molding process for producing PP tableware. The nozzle material can be recycled and reprocessed into granules for producing new plastic products, achieving efficient utilization of resources and reducing environmental impact.

[0003] However, in the process of reprocessing PP tableware nozzle material into plastic products, especially for producing protective packaging boxes for outdoor and transportation purposes, there are many technical challenges. As a common plastic product, packaging boxes need to meet a series of strict performance requirements. First, the packaging box must have sufficient compressive strength to withstand the pressure during stacking and transportation, ensuring that it will not deform or be damaged in the logistics link. Second, the packaging box needs to be able to withstand a certain impact force to prevent the product from being damaged during transportation, which is crucial for protecting the integrity of the internal product. In addition, the size of the packaging box should be perfectly adapted to the packaged product, effectively protecting the product without wasting space, thus facilitating transportation and storage. The nozzle material will undergo multiple heating and cooling cycles during the recycling process. This process will cause the molecular chain of the material to break, significantly reducing its impact performance, dimensional stability, and aging resistance, while greatly increasing its brittleness. This makes the new plastic product made from nozzle material prone to breakage during use, may have dimensional deviations after molding, and is prone to aging during use, significantly shortening its service life. In addition, the source of nozzle material is diverse, and different batches of nozzle material may have significant differences in composition, impurity content, etc. These differences further lead to instability and decline in the performance of the new packaging box, causing many inconveniences in actual application.

[0004] To address the above problems, some solutions have been proposed in the existing technology. For example, attempts have been made to improve its impact resistance and dimensional stability by adding toughening agents, stabilizers, and other modifiers. These modifiers can repair the breakage of molecular chains to some extent and enhance the toughness of the material. At the same time, by optimizing the recycling process to reduce the thermal history of the nozzle material during recycling, the decline in material performance can also be effectively reduced. In addition, to ensure the quality consistency of the nozzle material, some enterprises have adopted strict raw material screening and pretreatment processes, removing impurities through washing, screening, and other steps to improve the purity of the regenerated granules.

[0005] Although the prior art alleviates the problem of water gap performance degradation to some extent, these methods still have limitations. For example, adding modifiers can increase production costs, and optimizing the recovery process and raw material screening requires additional equipment investment and operational complexity. Therefore, how to further improve the performance stability of the water gap without significantly increasing the cost is still a technical problem to be solved. SUMMARY

[0006] In order to solve the problems of impact performance, dimensional stability and aging resistance of the packaging box prepared by the PP tableware material water gap, the application provides a preparation method for preparing a packaging box by a PP tableware material water gap and a product thereof.

[0007] In a first aspect, the application provides a preparation method for preparing a packaging box by a PP tableware material water gap, which adopts the following technical scheme:

[0008] A preparation method for preparing a packaging box by a PP tableware material water gap, comprising the following preparation steps:

[0009] S1, crushing the PP tableware material water gap at low temperature, and then cleaning it in a weak alkaline cleaning solution with a pH value of 10-11 to obtain a cleaned PP tableware material water gap;

[0010] S2, two-stage solvent extraction is used to clean the PP tableware material water gap, low-polarity solvent is used for extraction in the first stage, and high-polarity solvent is used for extraction in the second stage, and centrifugal separation is performed to obtain extracted PP;

[0011] S3, the extracted PP flows through a reaction channel containing TiO2 / activated carbon composite catalyst, and ozone is injected into the channel while the extracted PP is flowing through the channel to obtain pure PP;

[0012] S4, the pure PP, new PP, reactive antioxidant and nano-ZnO ultraviolet absorber are mixed uniformly, then extruded and granulated, and then the prepared particles are sent into the hopper of an injection molding machine, CO2 fluid is injected into the molten PP base material to form a mixture;

[0013] S5, the mixture is then injected into a three-zone gradient cooling mold, which sequentially includes a high-temperature zone, a medium-temperature zone and a low-temperature zone, and the shaped packaging box is naturally cooled to room temperature in the mold and then demolded to obtain the packaging box.

[0014] By adopting the above technical scheme, the compression strength, impact resistance, dimensional stability and aging resistance of the packaging box made of the water gap can be improved, the problems of performance degradation and unstable quality of the PP tableware material water gap during the preparation of the packaging box can be effectively solved, and the strict requirements of the packaging box for protecting articles during outdoor and transportation can be met.

[0015] Low-temperature crushing can avoid further degradation of the water gap material due to high temperature during the crushing process, while the weak alkaline cleaning solution can effectively remove oil stains, impurities and part of the low molecular weight impurities on the surface of the water gap material, improve the purity of the water gap material, and reduce the influence of impurities on subsequent processing and product performance. By segmenting extraction of low-polarity solvents and high-polarity solvents, impurities and low-molecular-weight substances in the water gap material can be further removed. Low-polarity solvents can remove grease impurities, and high-polarity solvents can remove water-soluble impurities. Two-stage extraction can more comprehensively remove impurities and improve the purity of the material, thereby improving its performance stability.

[0016] TiO2 has photocatalytic properties and can generate strong oxidizing free radicals under the action of ozone, further removing organic impurities and residual low-molecular-weight substances in the water gap material. At the same time, this treatment method can repair the molecular chain breakage caused by multiple recycling to some extent, and enhance the impact performance and dimensional stability of the material.

[0017] Reaction-type antioxidants can effectively inhibit the occurrence of oxidation reactions during the processing and use of PP, prolonging the service life of the material; nano-ZnO ultraviolet absorber can absorb ultraviolet rays, preventing PP from aging due to ultraviolet radiation during outdoor use, thereby improving the anti-aging performance of the packaging box, making it more suitable for use in outdoor and transportation product protection packaging boxes, and meeting its use requirements in different environments.

[0018] CO2 fluid is injected into the molten PP base material to form a mixture. CO2 fluid forms a microporous structure in the PP base material, which can act as a buffer to improve the impact resistance of the packaging box, allowing it to better withstand impact forces during transportation and prevent internal products from being damaged. At the same time, the microporous structure can also reduce the weight of the packaging box to some extent, facilitating transportation and storage.

[0019] Through a three-zone gradient cooling mold, cooling and forming are carried out in high-temperature, medium-temperature and low-temperature zones in sequence. This gradient cooling method can make the packaging box more uniform in heating and cooling during forming, reduce internal stress concentration and dimensional deviation caused by inconsistent cooling speed, thereby improving the dimensional stability and forming quality of the packaging box, allowing it to better adapt to the products it packages.

[0020] Compared with the prior art of simply adding a large amount of modifiers or a complex recovery process, the technical scheme improves the performance stability of the water gap material by optimizing the processing process and reasonably adding a small amount of reactive antioxidant, nano-ZnO ultraviolet absorber, etc., and avoids significantly increasing the production cost due to the addition of a large amount of modifiers. The whole preparation method takes the water gap of the PP tableware material as the main raw material, and through a series of processing steps, it is converted into high-quality raw material that can be used to produce packaging boxes, realizing efficient utilization of the water gap material, reducing the dependence on new PP, reducing production costs, and also reducing pollution to the environment caused by discarded water gap material.

[0021] Preferably, the weight percentage of pure PP, new PP, reactive antioxidant and nano-ZnO ultraviolet absorber in step S4 is 73-84%, 15-25%, 0.5-1% and 0.5-1%.

[0022] By adopting the above technical scheme, the use amount of pure PP, new PP, reactive antioxidant and nano-ZnO ultraviolet absorber is optimized, the use amount of PP tableware material water gap is increased, the dependence on new PP is reduced, and the cost is reduced. The addition of new PP can make up for the performance deficiency of pure PP, especially in impact resistance and dimensional stability. The addition ratio of new PP is controlled to be 15-25%, which can effectively improve the performance without significantly increasing the cost, and realizes the balance between performance and cost. A small amount of reactive antioxidant and nano-ZnO ultraviolet absorber is added to effectively improve the aging resistance without significantly increasing the cost.

[0023] Preferably, the temperature of the low-temperature crushing is -10--15℃.

[0024] By adopting the above technical scheme, the brittleness of the PP material is significantly increased, and it becomes easier to crush. Compared with normal temperature crushing, the required energy is greatly reduced, and the crushing efficiency is significantly improved. At the same time, the PP tableware material water gap can be more uniformly crushed into smaller particles, which is helpful for subsequent cleaning, solvent extraction and mixing process steps, and ensures that the material treatment effect is consistent. In the low-temperature crushing process, the PP material will not degrade or decrease in performance due to high temperature, which is beneficial to maintain the molecular chain integrity and mechanical properties of the material, and ensures that the performance of the material is not affected in the subsequent processing process.

[0025] Preferably, the pressure of the CO2 fluid injection is 25-30MPa, and the temperature is 165-170℃.

[0026] By adopting the above technical scheme, the pressure and temperature of the CO2 fluid injection are controlled, so that the CO2 fluid can be better dissolved in the molten PP base material, and the microporous structure formed is more uniform and fine, reducing the pore size non-uniformity. And the uniformly distributed microporous structure can effectively disperse stress when impacted, play a buffering role, and significantly improve the impact resistance of the packaging box. The existence of the microporous structure enables the material to better absorb energy when subjected to external force, reducing the risk of brittle fracture, thereby enhancing the toughness of the material.

[0027] Preferably, the temperature of the high-temperature zone is 100-110℃, the temperature of the medium-temperature zone is 75-80℃, and the temperature of the low-temperature zone is 40-45℃.

[0028] By adopting the above technical scheme, the temperature of the high-temperature zone, medium-temperature zone and low-temperature zone is optimized, avoiding the concentration of internal stress caused by rapid cooling, reducing the problems such as warping, deformation and cracking of the packaging box during cooling, ensuring the dimensional stability of the packaging box, so that it can more accurately reach the designed size after forming, reducing the size deviation caused by uneven cooling, thereby improving the qualified rate of the product. At the same time, gradient cooling can form a more uniform microstructure in the material during cooling, reducing the increase in brittleness caused by rapid cooling, which helps to improve the impact resistance of the packaging box, making it more impact-resistant during transportation and use.

[0029] Preferably, the reactive antioxidant is antioxidant 168.

[0030] By adopting the above technical scheme, antioxidant 168 can effectively decompose hydrogen peroxide generated during the thermal processing of polymeric materials, preventing oxidative degradation of the polymer. At the same time, during the injection molding process, the PP material will undergo high-temperature treatment, which is prone to thermal oxidative degradation. Antioxidant 168 can remain stable under high-temperature conditions and continuously exert antioxidant effect, preventing the material from becoming brittle or performance degradation due to oxidation during processing and use.

[0031] Preferably, the particle size of the nano-ZnO ultraviolet absorber is 50-200nm.

[0032] By adopting the above technical scheme, the particle size of the nano-ZnO ultraviolet absorber is optimized, which can effectively absorb ultraviolet rays and improve the microstructure of the PP material, enhancing the toughness and impact resistance of the material. Nano-particles form tiny stress dispersion points in the material, which can effectively disperse stress when impacted by external force, reducing the risk of brittle fracture.

[0033] Preferably, the concentration of ozone is 50-200ppm.

[0034] Preferably, the extracted PP passes through the reaction channel at a flow rate of 100-200 ml / min, the residence time of the PP in the reaction channel is 30-40 min, and the temperature of the reaction channel should be 100-150℃.

[0035] Preferably, ozone is injected at a flow rate of 100-200 sccm while the PP is flowing through the reaction channel.

[0036] By adopting the above technical solutions, the concentration of ozone, the injection speed, the flow rate of the extracted PP, the residence time, and the temperature are optimized, which can effectively decompose the residual impurities and low molecular weight substances in the PP, further purify the PP material, and help reduce the negative impact of impurities on the performance of the material, such as reducing brittleness and improving dimensional stability.

[0037] Preferably, the low-polarity solvent is composed of n-hexane and acetone in a weight ratio of (1-3):1.

[0038] By adopting the above technical solutions, the mixed solvent of n-hexane and acetone has good solubility and flowability, effectively removes impurities, significantly improves the purity of the PP material, and reduces the negative impact of impurities on the performance of the material, such as reducing brittleness, improving dimensional stability, and impact resistance. By optimizing the ratio of solvents, the extraction effect can be ensured while reducing the cost of solvents and improving the economy of the production process.

[0039] Preferably, the first-stage extraction temperature is 25-30℃, and the stirring speed is 100-200 rpm.

[0040] Preferably, the second-stage extraction temperature is 30-35℃, and the stirring speed is 150-300 rpm.

[0041] By adopting the above technical solutions, the temperature and stirring speed are optimized, which can significantly improve the extraction efficiency and shorten the processing time.

[0042] Preferably, the PP tableware material sprue is pretreated using an ultrasonic pretreatment device with an ultrasonic frequency of 20-40 kHz before entering the two-stage solvent extraction.

[0043] By adopting the above technical solutions, the amount of solvent required and the processing time in the subsequent extraction process can be reduced, the production cost and environmental impact can be reduced, the performance of the material is not damaged, higher-quality raw materials are provided for subsequent processes, and the performance and quality of the final product are improved.

[0044] In a second aspect, the application provides a packaging box prepared from a PP tableware material sprue, which adopts the following technical solutions: a packaging box prepared from a PP tableware material sprue, which is prepared by the first aspect of the method for preparing a packaging box from a PP tableware material sprue.

[0045] The packaging box has sufficient compression strength and impact toughness, good size adaptability and weather resistance, and is suitable for outdoor and transportation protection. Meanwhile, the packaging box makes full use of the water gap material, reduces the dependence on new PP, reduces the production cost and environmental impact, has high economy and sustainability, and improves the market competitiveness of the product.

[0046] In summary, the application has the following beneficial effects:

[0047] 1. By low-temperature crushing, weak alkaline cleaning, two-stage solvent extraction, TiO2 / activated carbon composite catalyst and ozone treatment, the purity of the PP tableware material water gap is effectively improved, the negative influence of impurities and low molecular weight substances on performance is reduced, and the anti-aging performance of the material is enhanced. At the same time, the addition of reactive antioxidant and nano-ZnO ultraviolet absorber further improves the anti-aging performance of the packaging box, making it more suitable for outdoor and transportation use. The microporous structure formed by CO2 fluid injection significantly enhances the impact resistance of the packaging box, reduces the weight, and facilitates transportation and storage. The use of a three-zone gradient cooling mold makes the packaging box forming more uniform, improves the dimensional stability and forming quality. In addition, this scheme makes full use of the water gap material, reduces the dependence on new PP, reduces the production cost and environmental impact, and has high economy and sustainability. DETAILED DESCRIPTION

[0048] EMBODIMENT

[0049] EMBODIMENT 1

[0050] A packaging box prepared from a PP tableware material water gap is prepared by the following method:

[0051] S1, 2 kg of PP tableware material water gap is crushed at low temperature, and then cleaned in a weak alkaline cleaning solution (sodium carbonate solution) with a pH value of 10 to obtain cleaned PP tableware material water gap;

[0052] The temperature of low-temperature crushing is -10℃;

[0053] S2, the cleaned PP tableware material water gap is extracted by two-stage solvent extraction, the first stage uses a low-polarity solvent for extraction, and the second stage uses a high-polarity solvent (dimethyl sulfoxide) for extraction, and then centrifuged to obtain the extracted PP;

[0054] The low-polarity solvent is composed of n-hexane and acetone in a weight ratio of 1:1;

[0055] The first stage extraction temperature is 25℃, the stirring speed is 100 rpm, and the extraction time is 40 min;

[0056] The second stage extraction temperature is 30℃, the stirring speed is 150 rpm, and the extraction time is 30 min.

[0057] S3, the extracted PP flows through a reaction channel filled with TiO2 / activated carbon composite catalyst, and ozone is injected into the channel while the extracted PP flows through the channel, to obtain pure PP;

[0058] The concentration of ozone is 50 ppm;

[0059] The extracted PP passes through the reaction channel at a rate of 100 ml / min, and the residence time of the PP in the reaction channel is 30 min, and the temperature of the reaction channel should be 100°C;

[0060] While the PP flows through the reaction channel, ozone is injected at a flow rate of 100 sccm;

[0061] S4, pure PP 730g, new PP 250g, reaction type antioxidant 10g (antioxidant 168) and nano ZnO ultraviolet absorber 10g are mixed uniformly, then extruded and granulated, and then the prepared particles are sent to the hopper of an injection molding machine, CO2 fluid is injected into the molten PP base material to form a mixture;

[0062] The particle size of the nano ZnO ultraviolet absorber is 50 nm;

[0063] The injection pressure of CO2 fluid is 25 MPa, and the temperature is 165°C;

[0064] S5, the mixture is injected into a three-zone gradient cooling mold, which includes a high-temperature zone, a medium-temperature zone and a low-temperature zone in sequence, and the formed packaging box is naturally cooled to room temperature in the mold, then demolded to obtain the packaging box;

[0065] The temperature of the high-temperature zone is 100°C, the temperature of the medium-temperature zone is 75°C, and the temperature of the low-temperature zone is 40°C.

[0066] Example 2-3 differs from Example 1 in that the types, amounts and parameters of the raw materials for preparing the packaging box using PP tableware material water ports are different, and the specific differences are shown in Table 1:

[0067] Table 1 Types, amounts and parameters of raw materials for preparing packaging boxes using PP tableware material water ports

[0068]

[0069]

[0070] Example 4

[0071] A packaging box prepared by using a PP tableware material nozzle, different from example 1 is that the PP tableware material nozzle is pretreated by using an ultrasonic frequency of 40 kHz ultrasonic pretreatment equipment before entering the two-stage solvent extraction.

[0072] Example 5

[0073] A packaging box prepared by using a PP tableware material nozzle, different from example 1 is that the PP tableware material nozzle is pretreated by using an ultrasonic frequency of 40 kHz ultrasonic pretreatment equipment before entering the two-stage solvent extraction.

[0074] Example 6

[0075] A packaging box prepared by using a PP tableware material nozzle, different from example 1 is that the reactive antioxidant is antioxidant 1010.

[0076] Example 7

[0077] A packaging box prepared by using a PP tableware material nozzle, different from example 1 is that the low-polarity solvent is n-hexane.

[0078] Example 8

[0079] A packaging box prepared by using a PP tableware material nozzle, different from example 1 is that the pressure of CO2 fluid injection is 20 MPa.

[0080] Comparative example

[0081] Comparative example 1

[0082] A packaging box prepared by using a PP tableware material nozzle, different from example 1 is that the PP tableware material nozzle is crushed in an environment of 30 DEG C.

[0083] Comparative example 2

[0084] A packaging box prepared by using a PP tableware material nozzle, different from example 1 is that the second-stage extraction is omitted in step S2.

[0085] Comparative example 3

[0086] A packaging box prepared by using a PP tableware material nozzle, different from example 1 is that step S3 is omitted.

[0087] Comparative example 4

[0088] A packaging box prepared by using a PP tableware material nozzle, different from example 1 is that no virgin PP is added in step S4.

[0089] Comparative Example 5

[0090] A packaging box was prepared by using PP tableware material nozzle. The difference between the present comparative example and Example 1 is that the mold temperature is 75℃ in step S5, and the temperature is kept constant during the whole cooling process.

[0091] Detection method / test method

[0092] Tensile strength and elongation at break: refer to ISO 527-2 standard, condition is 50mm / min;

[0093] Impact strength: refer to ISO 180 / 1U standard;

[0094] Aging resistance test: refer to ASTM G154 standard, select UVA-340, temperature is 60℃, relative humidity is 50%, set the total irradiation time to 1000 hours, and then test the tensile strength and elongation at break.

[0095] Dimensional stability test: 20 packaging boxes of Examples 1-8 and Comparative Examples 1-5 were continuously produced by using PP tableware material nozzle, and the thickness of the first packaging box was tested. The number of packaging boxes with thickness change exceeding 5% was counted. The experimental data is shown in Table 2:

[0096] Table 2 Experimental data of Examples 1-8 and Comparative Examples 1-5

[0097]

[0098] From the experimental data of Example 1 and Comparative Examples 1-5, it can be seen that the tensile strength, elongation at break and impact strength of Comparative Examples 1-5 are significantly lower than those of Example 1, and the decrease in tensile strength, elongation at break and impact strength of Comparative Examples 1-5 after aging is larger; the number of packaging boxes with thickness change exceeding 5% of Comparative Examples 1-5 is significantly higher than that of Example 1, i.e. the dimensional stability of Comparative Examples 1-5 is poor, which indicates that the process and formula in the present application have a significant effect on improving the mechanical properties, aging resistance and dimensional stability of the packaging box.

[0099] From the experimental data of Example 1 and Examples 4-5, it can be seen that the tensile strength, elongation at break and impact strength of Examples 4-5 are slightly higher than those of Example 1, which indicates that the ultrasonic pretreatment is helpful to improve the tensile strength, elongation at break, impact strength and aging resistance of the packaging box, and further improve the dimensional stability of the packaging box.

[0100] From the experimental data of Example 1 and Examples 6-8, it can be seen that by optimizing the type of reactive antioxidant, the type of low-polarity solvent and the pressure of CO2 fluid injection, it is beneficial to improve the tensile strength, elongation at break, impact strength and aging resistance of the packaging box.

[0101] The embodiments are only illustrative of the present application, and are not intended to limit the present application, and those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, but as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A method for producing a package using a PP tableware material nozzle, characterized by, The preparation method comprises the following steps: S1, the PP tableware material nozzle is crushed at low temperature, and then is cleaned in an alkaline cleaning solution with a pH value of 10-11 to obtain a cleaned PP tableware material nozzle; S2, the cleaned PP tableware material nozzle is extracted by two-stage solvent extraction, the first stage uses a low-polarity solvent for extraction, and the second stage uses a high-polarity solvent for extraction, and then is centrifuged to obtain extracted PP; S3, the extracted PP flows through a reaction channel provided with a TiO2 / activated carbon composite catalyst, and ozone is injected into the channel while the extracted PP flows through the channel, to obtain pure PP; S4, the pure PP, new PP, reactive antioxidant and nano-ZnO ultraviolet absorbent are uniformly mixed, and then are extruded and granulated, and then the prepared particles are fed into a hopper of an injection molding machine, and CO2 fluid is injected into the molten PP base material to form a mixture; S5, the mixture is injected into a three-zone gradient cooling mold, the three-zone gradient cooling mold comprises a high-temperature zone, a medium-temperature zone and a low-temperature zone in sequence, and the formed packaging box is naturally cooled to room temperature in the mold, and then is demolded to obtain the packaging box; In step S4, the weight percentages of the pure PP, the new PP, the reactive antioxidant and the nano-ZnO ultraviolet absorbent are 73-84%, 15-25%, 0.5-1% and 0.5-1%, respectively; The pressure of the CO2 fluid injection is 25-30 MPa, and the temperature is 165-170℃; The reactive antioxidant is antioxidant 168; The low-polarity solvent is composed of n-hexane and acetone in a weight ratio of (1-3):1; The temperature of the low-temperature crushing is -10--15℃.

2. The method for preparing packaging boxes using PP tableware material sprues according to claim 1, characterized in that: The temperature of the high-temperature zone is 100-110℃, the temperature of the medium-temperature zone is 75-80℃, and the temperature of the low-temperature zone is 40-45℃.

3. The method for preparing packaging boxes using PP tableware material sprues according to claim 1, characterized in that: The particle size of the nano-ZnO ultraviolet absorbent is 50-200 nm.

4. A method for preparing packaging boxes using PP tableware material sprues according to claim 1, characterized in that: The concentration of the ozone is 50-200 ppm.

5. The method for preparing a packaging box using PP tableware material sprues according to claim 1, characterized in that: Before the PP tableware material nozzle enters the two-stage solvent extraction, the PP tableware material nozzle is pretreated by using an ultrasonic pretreatment device with an ultrasonic frequency of 20-40 kHz.

6. A method of making a package using a PP utensil material nozzle, characterized by: The packaging box is prepared by the packaging box preparation method of any one of claims 1-5.

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