A method for producing a stretch-resistant packaging wrap film

Abstract

This invention relates to the field of stretch film preparation technology and discloses a method for preparing tensile-resistant packaging stretch film, comprising the following steps: material preparation, cleaning and impurity removal, stirring and mixing, stretching and extrusion, casting into film, cooling and calendering, and winding and packaging. The process of this invention is scientific and reasonable. By selecting LLDPE granules, PP granules, PIB masterbatch, and trifluorochloroethylene copolymer granules as raw materials, and cleaning, filtering, and vacuum drying the raw materials respectively, the cleanliness of the granular raw materials is ensured, the impurities attached to the granular raw materials are reduced, the raw materials are mixed more completely, and the time required for stirring the granular raw materials into a mixture is reduced. By sending the extruded plastic melt into a casting machine to form a film and then introducing it into a cooling roller for cooling and stretching, the obtained stretch film can be cooled and stretched twice, avoiding the uneven thickness of the stretch film caused by single stretching, and improving the thickness uniformity of the prepared stretch film.

Description

Technical Field

[0001] This invention relates to the field of stretch film preparation technology, specifically to a method for preparing a tensile-resistant packaging stretch film. Background Technology

[0002] Stretch film is mainly used for the sale and transportation of various products. Its main function is to stabilize, cover, and protect the products. Therefore, stretch film must have high puncture resistance, good shrinkage and shrinkage resistance. Initially, stretch film was mainly made of PVC. As the performance requirements of stretch film have continued to increase, PVC stretch film has gradually decreased, while various polyethylene stretch films have developed rapidly. Polyethylene stretch film is a material with excellent toughness and is widely used for bulk packaging of products such as wine, cans, mineral water, various beverages, and fabrics. This product has good flexibility, strong impact and tear resistance, is not easily damaged, is moisture-proof, and has a large shrinkage rate.

[0003] Currently available polyethylene stretch film on the market is prone to deformation and breakage when subjected to a certain amount of stretching, and it is also easily damaged when subjected to impact, which will lead to a decrease in the packaging effect of the goods.

[0004] To address the shortcomings of existing technologies, this invention provides a method for preparing tensile-resistant wrapping film, which solves the problems that wrapping film is prone to deformation and breakage after being stretched to a certain extent, and is also prone to damage when subjected to impact, which leads to a deterioration in the packaging effect of goods. Summary of the Invention

[0005] To address the issues that stretch film is prone to deformation and breakage under stretching and is easily damaged by impact, thus degrading its packaging effectiveness, this invention provides the following technical solution:

[0006] A method for preparing a tensile-resistant packaging stretch film includes the following steps:

[0007] S1. Material preparation: Select LLDPE granules, PP granules, PIB masterbatch, trifluorochloroethylene copolymer granules and additives for later use;

[0008] S2. Cleaning and impurity removal: The selected LLDPE granules, PP granules, PIB masterbatch and trifluorochloroethylene copolymer granules are washed, filtered and vacuum dried respectively.

[0009] S3. Mixing: Select LLDPE granules, PP granules, PIB masterbatch and trifluorochloroethylene copolymer granules and place them in a mixer to mix. Heat and stir evenly to obtain a mixture.

[0010] S4. Winding extrusion: The plastic melt in the mixer is fed into a twin-screw extruder for high-temperature extrusion;

[0011] S5. Casting film: The extruded plastic melt is fed into a casting machine to cast film and obtain polyethylene wrapping film;

[0012] S6. Cooling and calendering: Select the obtained polyethylene wrapping film, feed it into the cooling roller for cooling and stretching, and then calender the wrapping film.

[0013] S7. Rewinding and Packaging: The produced stretch wrap film is rewound to form a large master roll, and the master roll is then packaged.

[0014] Based on the above technical features, in step S1, LLDPE granular material, PP granular material, PIB masterbatch, trifluorochloroethylene copolymer granules and additives are selected for later use. The additives are specifically flame retardants, antioxidants, plasticizers and silane coupling agents, and the flame retardants, antioxidants, plasticizers and silane coupling agents are in a weight ratio of 2:3:1:1.

[0015] Based on the above technical features, in step S1, the LLDPE granular material, PP granular material, PIB masterbatch, trifluorochloroethylene copolymer granules, and additives are specifically as follows, by weight:

[0016] 50-80 parts LLDPE granules; 20-40 parts PP granules; 2-8 parts PIB masterbatch; 20-40 parts trifluorochloroethylene copolymer granules; 2-6 parts additives.

[0017] According to the above technical features, in step S1, the additives are specifically flame retardants, antioxidants, plasticizers, and silane coupling agents. The flame retardant is specifically one or more of decabromodiphenyl ethane, triphenyl phosphate, or zinc borate. The antioxidant is specifically one or more of 6-ethoxy-2, 2,4-trimethyl-1, and 2-dihydroquinoline. The plasticizer is specifically one of dioctyl phthalate or dibutyl phthalate. The silane coupling agent is specifically one of KH560 and Si69.

[0018] According to the above technical features, in step S2, the selected LLDPE granules, PP granules, PIB masterbatch and trifluorochloroethylene copolymer granules are respectively sent to the cleaning equipment for washing, and the washing time is maintained at 40-60 minutes. After washing, they are placed in a disc filter for filtration. Then, the washed raw materials are placed in a rotary vacuum drying equipment for drying, and the drying time is maintained at 15-25 minutes.

[0019] According to the above technical features, in step S3, LLDPE granules, PP granules, PIB masterbatch, and trifluorochloroethylene copolymer granules are selected and placed in a mixer for mixing. The mixture is heated to 220-240°C so that the granular raw materials are completely mixed to form a melt. After stirring evenly, a mixture is obtained.

[0020] According to the above technical features, in step S4, the plastic melt in the mixer is fed into the twin-screw extruder for high-temperature extrusion, and the temperature of the plastic melt being extruded in the twin-screw extruder is maintained at 205-230℃.

[0021] According to the above technical features, in step S5, the extruded plastic melt is fed into a casting machine to cast into a film, so as to facilitate the migration of the adhesive and obtain a polyethylene wrapping film. The temperature of the casting cooling roller is controlled at 30-35°C.

[0022] According to the above technical features, in step S6, the selected polyethylene wrapping film is introduced into a cooling roller for cooling and stretching, and then the wrapping film is transferred to a calendering device for calendering. The temperature of the cooling roller is controlled at 20-30℃, and the winding tension is controlled at 6-8kg.

[0023] Based on the above technical features, in step S7, the produced stretch film is subjected to quality inspection, and the size, smoothness and transparency of the stretch film are tested. Then, it is rolled up to form a large master roll, and the master roll is packaged.

[0024] Compared with the prior art, the present invention provides a method for preparing tensile-resistant packaging stretch film, which has the following beneficial effects:

[0025] 1. By selecting LLDPE granules, PP granules, PIB masterbatch, trifluorochloroethylene copolymer granules, and additives for use, and by cleaning, filtering, and vacuum drying the raw materials respectively, the cleanliness of the granular raw materials can be guaranteed, the impurities attached to the granular raw materials can be reduced, and the cleanliness and light transmittance of the subsequently prepared stretch film can be guaranteed. Combined with mixing LLDPE granules, PP granules, PIB masterbatch, and trifluorochloroethylene copolymer granules in a mixer and heating to 230°C, the granular raw materials are completely mixed to form a melt. After stirring evenly, a mixture is obtained, which can further improve the complete mixing of raw materials, reduce the time required to stir the granular raw materials into a mixture, and improve the efficiency of the stretch film preparation process.

[0026] 2. By feeding the plastic melt into a twin-screw extruder for high-temperature extrusion, and then feeding the extruded plastic melt into a casting machine to cast a film, and facilitating the migration of the adhesive, a polyethylene stretch film is obtained. The obtained polyethylene stretch film is then fed into a cooling roller for cooling and stretching, and then transferred to a calendering device for calendering. This process allows for two cooling and stretching of the obtained stretch film, avoiding uneven thickness caused by single stretching, and improving the uniformity of the thickness of the prepared stretch film. Attached Figure Description

[0027] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0028] In the attached diagram:

[0029] Figure 1 This is a schematic diagram of the method flow of the present invention. Detailed Implementation

[0030] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0031] Example 1: This invention provides a technical solution, a method for preparing a tensile-resistant packaging stretch film, such as... Figure 1 As shown, it includes the following steps:

[0032] S1. Material preparation: Select LLDPE granules, PP granules, PIB masterbatch, trifluorochloroethylene copolymer granules and additives for later use;

[0033] S2. Cleaning and impurity removal: The selected LLDPE granules, PP granules, PIB masterbatch and trifluorochloroethylene copolymer granules are washed, filtered and vacuum dried respectively.

[0034] S3. Mixing: Select LLDPE granules, PP granules, PIB masterbatch and trifluorochloroethylene copolymer granules and place them in a mixer to mix. Heat and stir evenly to obtain a mixture.

[0035] S4. Winding extrusion: The plastic melt in the mixer is fed into a twin-screw extruder for high-temperature extrusion;

[0036] S5. Casting film: The extruded plastic melt is fed into a casting machine to cast film and obtain polyethylene wrapping film;

[0037] S6. Cooling and calendering: Select the obtained polyethylene wrapping film, feed it into the cooling roller for cooling and stretching, and then calender the wrapping film.

[0038] S7. Rewinding and Packaging: The produced stretch wrap film is rewound to form a large master roll, and the master roll is then packaged.

[0039] In step S1, LLDPE granules, PP granules, PIB masterbatch, trifluorochloroethylene copolymer granules, and additives are selected for later use. The additives are specifically flame retardants, antioxidants, plasticizers, and silane coupling agents, and the flame retardants, antioxidants, plasticizers, and silane coupling agents are in a weight ratio of 2:3:1:1.

[0040] In step S1, the LLDPE granules, PP granules, PIB masterbatch, trifluorochloroethylene copolymer granules, and additives are specifically as follows, by weight:

[0041] 65 parts LLDPE granules; 30 parts PP granules; 5 parts PIB masterbatch; 30 parts trifluorochloroethylene copolymer granules; 4 parts additives.

[0042] In step S1, the additives are specifically flame retardants, antioxidants, plasticizers, and silane coupling agents. The flame retardant is specifically decabromodiphenyl ethane, the antioxidant is specifically 6-ethoxy-2, the plasticizer is specifically dioctyl phthalate, and the silane coupling agent is specifically KH560.

[0043] In step S2, the selected LLDPE granules, PP granules, PIB masterbatch and trifluorochloroethylene copolymer granules are respectively sent to the cleaning equipment for washing. The washing time is maintained at 50 minutes. After washing, they are placed in a disc filter for filtration. Then, the washed raw materials are placed in a rotary vacuum dryer for drying. The drying time is maintained at 20 minutes.

[0044] In step S3, LLDPE granules, PP granules, PIB masterbatch, and trifluorochloroethylene copolymer granules are selected and placed in a mixer for mixing. The mixture is heated to 230°C to ensure that the granular raw materials are completely mixed to form a melt. After stirring evenly, a mixture is obtained.

[0045] In step S4, the plastic melt in the mixer is fed into a twin-screw extruder for high-temperature extrusion. The temperature of the plastic melt during extrusion in the twin-screw extruder is maintained at 220°C.

[0046] In step S5, the extruded plastic melt is fed into a casting machine to cast into a film, which facilitates the migration of the adhesive and obtains a polyethylene wrapping film. The temperature of the casting cooling roller is controlled at 33°C.

[0047] In step S6, the obtained polyethylene stretch film is selected, introduced into the cooling roller for cooling and stretching, and then the stretch film is transferred to the calendering equipment for calendering. The temperature of the cooling roller is controlled at 25°C and the winding tension is controlled at 7kg.

[0048] In step S7, the produced stretch film undergoes quality inspection, with checks on its size, smoothness, and transparency. It is then rolled up to form a large master roll, which is then packaged.

[0049] Example 2: The present invention provides a technical solution, a method for preparing a tensile-resistant packaging stretch film, such as... Figure 1 As shown, it includes the following steps:

[0050] S1. Material preparation: Select LLDPE granules, PP granules, PIB masterbatch, trifluorochloroethylene copolymer granules and additives for later use;

[0051] S2. Cleaning and impurity removal: The selected LLDPE granules, PP granules, PIB masterbatch and trifluorochloroethylene copolymer granules are washed, filtered and vacuum dried respectively.

[0052] S3. Mixing: Select LLDPE granules, PP granules, PIB masterbatch and trifluorochloroethylene copolymer granules and place them in a mixer to mix. Heat and stir evenly to obtain a mixture.

[0053] S4. Winding extrusion: The plastic melt in the mixer is fed into a twin-screw extruder for high-temperature extrusion;

[0054] S5. Casting film: The extruded plastic melt is fed into a casting machine to cast film and obtain polyethylene wrapping film;

[0055] S6. Cooling and calendering: Select the obtained polyethylene wrapping film, feed it into the cooling roller for cooling and stretching, and then calender the wrapping film.

[0056] S7. Rewinding and Packaging: The produced stretch wrap film is rewound to form a large master roll, and the master roll is then packaged.

[0057] In step S1, LLDPE granules, PP granules, PIB masterbatch, trifluorochloroethylene copolymer granules, and additives are selected for later use. The additives are specifically flame retardants, antioxidants, plasticizers, and silane coupling agents, and the flame retardants, antioxidants, plasticizers, and silane coupling agents are in a weight ratio of 2:3:1:1.

[0058] In step S1, the LLDPE granules, PP granules, PIB masterbatch, trifluorochloroethylene copolymer granules, and additives are specifically as follows, by weight:

[0059] 50 parts LLDPE granules; 20 parts PP granules; 2 parts PIB masterbatch; 20 parts trifluorochloroethylene copolymer granules; 2 parts additives.

[0060] In step S1, the additives are specifically flame retardants, antioxidants, plasticizers, and silane coupling agents. The flame retardant is specifically decabromodiphenyl ethane, the antioxidant is specifically one or more of 6-ethoxy-2, 2,4-trimethyl-1, and 2-dihydroquinoline, the plasticizer is specifically dioctyl phthalate, and the silane coupling agent is specifically KH560.

[0061] In step S2, the selected LLDPE granules, PP granules, PIB masterbatch and trifluorochloroethylene copolymer granules are respectively sent to the cleaning equipment for washing. The washing time is maintained at 40 minutes. After washing, they are placed in a disc filter for filtration. Then, the washed raw materials are placed in a rotary vacuum dryer for drying. The drying time is maintained at 15 minutes.

[0062] In step S3, LLDPE granules, PP granules, PIB masterbatch, and trifluorochloroethylene copolymer granules are selected and placed in a mixer for mixing. The mixture is heated to 220°C to ensure that the granular raw materials are completely mixed to form a melt. After stirring evenly, a mixture is obtained.

[0063] In step S4, the plastic melt in the mixer is fed into a twin-screw extruder for high-temperature extrusion. The temperature of the plastic melt during extrusion in the twin-screw extruder is maintained at 205°C.

[0064] In step S5, the extruded plastic melt is fed into a casting machine to cast into a film, so as to facilitate the migration of the adhesive and obtain a polyethylene wrapping film. The temperature of the casting cooling roller is controlled at 30°C.

[0065] In step S6, the obtained polyethylene stretch film is selected, introduced into the cooling roller for cooling and stretching, and then the stretch film is transferred to the calendering equipment for calendering. The temperature of the cooling roller is controlled at 20°C and the winding tension is controlled at 6kg.

[0066] In step S7, the produced stretch film undergoes quality inspection, with checks on its size, smoothness, and transparency. It is then rolled up to form a large master roll, which is then packaged.

[0067] Example 3: The present invention provides a technical solution, a method for preparing a tensile-resistant packaging stretch film, such as... Figure 1 As shown, it includes the following steps:

[0068] S1. Material preparation: Select LLDPE granules, PP granules, PIB masterbatch, trifluorochloroethylene copolymer granules and additives for later use;

[0069] S2. Cleaning and impurity removal: The selected LLDPE granules, PP granules, PIB masterbatch and trifluorochloroethylene copolymer granules are washed, filtered and vacuum dried respectively.

[0070] S3. Mixing: Select LLDPE granules, PP granules, PIB masterbatch and trifluorochloroethylene copolymer granules and place them in a mixer to mix. Heat and stir evenly to obtain a mixture.

[0071] S4. Winding extrusion: The plastic melt in the mixer is fed into a twin-screw extruder for high-temperature extrusion;

[0072] S5. Casting film: The extruded plastic melt is fed into a casting machine to cast film and obtain polyethylene wrapping film;

[0073] S6. Cooling and calendering: Select the obtained polyethylene wrapping film, feed it into the cooling roller for cooling and stretching, and then calender the wrapping film.

[0074] S7. Rewinding and Packaging: The produced stretch wrap film is rewound to form a large master roll, and the master roll is then packaged.

[0075] In step S1, LLDPE granules, PP granules, PIB masterbatch, trifluorochloroethylene copolymer granules, and additives are selected for later use. The additives are specifically flame retardants, antioxidants, plasticizers, and silane coupling agents, and the flame retardants, antioxidants, plasticizers, and silane coupling agents are in a weight ratio of 2:3:1:1.

[0076] In step S1, the LLDPE granules, PP granules, PIB masterbatch, trifluorochloroethylene copolymer granules, and additives are specifically as follows, by weight:

[0077] 80 parts LLDPE granules; 40 parts PP granules; 8 parts PIB masterbatch; 40 parts trifluorochloroethylene copolymer granules; 6 parts additives.

[0078] In step S1, the additives are specifically flame retardants, antioxidants, plasticizers, and silane coupling agents. The flame retardant is specifically triphenyl phosphate, the antioxidant is specifically 2-dihydroquinoline, the plasticizer is specifically dibutyl phthalate, and the silane coupling agent is specifically Si69.

[0079] In step S2, the selected LLDPE granules, PP granules, PIB masterbatch and trifluorochloroethylene copolymer granules are respectively sent to the cleaning equipment for washing. The washing time is maintained at 60 minutes. After washing, they are placed in a disc filter for filtration. Then, the washed raw materials are placed in a rotary vacuum dryer for drying. The drying time is maintained at 25 minutes.

[0080] In step S3, LLDPE granules, PP granules, PIB masterbatch, and trifluorochloroethylene copolymer granules are selected and placed in a mixer for mixing. The mixture is heated to 240°C to ensure that the granular raw materials are completely mixed to form a melt. After stirring evenly, a mixture is obtained.

[0081] In step S4, the plastic melt in the mixer is fed into a twin-screw extruder for high-temperature extrusion. The temperature of the plastic melt during extrusion in the twin-screw extruder is maintained at 230°C.

[0082] In step S5, the extruded plastic melt is fed into a casting machine to cast into a film, which facilitates the migration of the adhesive and obtains a polyethylene wrapping film. The temperature of the casting cooling roller is controlled at 35°C.

[0083] In step S6, the obtained polyethylene stretch film is selected, introduced into the cooling roller for cooling and stretching, and then the stretch film is transferred to the calendering equipment for calendering. The temperature of the cooling roller is controlled at 30°C and the winding tension is controlled at 8kg.

[0084] In step S7, the produced stretch film undergoes quality inspection, with checks on its size, smoothness, and transparency. It is then rolled up to form a large master roll, which is then packaged.

[0085] Based on the above embodiments, the obtained stretch film was tested, and the results are shown in the table below:

[0086]

[0087] As can be seen from the table above, the stretch film prepared by selecting 65 parts by weight of LLDPE granules, 30 parts by weight of PP granules, 5 parts by weight of PIB masterbatch, 30 parts by weight of trifluorochloroethylene copolymer and 4 parts by weight of granular additives has the advantages of tensile strength, tensile fracture resistance and impact resistance.

[0088] Working principle: In the preparation of this stretch film, firstly select 65 parts by weight of LLDPE granules, 30 parts of PP granules, 5 parts of PIB masterbatch, 30 parts of trifluorochloroethylene copolymer granules and 4 parts of additives for later use. The LLDPE granules, PP granules, PIB masterbatch and trifluorochloroethylene copolymer granules are sent to a cleaning device for 50 minutes of cleaning. After cleaning, they are placed in a disc filter for filtration. Then, the cleaned raw materials are placed in a rotary vacuum drying device for 20 minutes of drying.

[0089] Subsequently, LLDPE granules, PP granules, PIB masterbatch, and trifluorochloroethylene copolymer granules are placed in a mixer and mixed. The mixture is heated to 230°C to ensure that the granular raw materials are completely mixed to form a melt. After stirring evenly, a mixture is obtained. The plastic melt in the mixer is fed into a twin-screw extruder and extruded at a constant temperature of 220°C. The extruded plastic melt is then fed into a casting machine to cast into a film. The temperature of the casting cooling roller is kept constant at 33°C to facilitate the migration of the adhesive, resulting in a polyethylene stretch film.

[0090] The obtained polyethylene stretch film is then fed into a chiller roller at a constant temperature of 25°C for cooling and stretching, and the tension of the roll is controlled at 7 kg. The stretch film is then transferred to a calender for calendering. Finally, the produced stretch film is subjected to quality inspection, and the size, smoothness and transparency of the stretch film are tested. It is then rolled up to form a large master roll, which is then packaged.

[0091] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing a tensile-resistant packaging stretch film, characterized in that, Includes the following steps: S1. Material preparation: Select LLDPE granules, PP granules, PIB masterbatch, trifluorochloroethylene copolymer granules and additives for later use; S2. Cleaning and impurity removal: The selected LLDPE granules, PP granules, PIB masterbatch and trifluorochloroethylene copolymer granules are washed, filtered and vacuum dried respectively. S3. Mixing: Select LLDPE granules, PP granules, PIB masterbatch and trifluorochloroethylene copolymer granules and mix them in a mixer. Heat and stir evenly to obtain a mixture. S4. Winding extrusion: The plastic melt in the mixer is fed into a twin-screw extruder for high-temperature extrusion; S5. Casting film: The extruded plastic melt is fed into a casting machine to cast film and obtain polyethylene wrapping film; S6. Cooling and calendering: Select the obtained polyethylene wrapping film, feed it into the cooling roller for cooling and stretching, and then calender the wrapping film. S7. Rewinding and Packaging: The produced stretch wrap film is rewound to form a large master roll, and the master roll is packaged. In step S1, the LLDPE granules, PP granules, PIB masterbatch, trifluorochloroethylene copolymer granules, and additives are specifically as follows, by weight: 50-80 parts LLDPE granules; 20-40 parts PP granules; 2-8 parts PIB masterbatch; 20-40 parts trifluorochloroethylene copolymer granules; 2-6 parts additives.

2. A process for the production of a stretch- resistant packaging wrapping film according to claim 1, characterized in that, In step S1, LLDPE granules, PP granules, PIB masterbatch, trifluorochloroethylene copolymer granules, and additives are selected for later use. The additives are specifically flame retardants, antioxidants, plasticizers, and silane coupling agents, and the flame retardants, antioxidants, plasticizers, and silane coupling agents are in a weight ratio of 2:3:1:

1.

3. A process for the production of a stretch- resistant packaging wrapping film according to claim 1, characterized in that, In step S1, the additives are specifically flame retardants, antioxidants, plasticizers, and silane coupling agents. The flame retardant is specifically one or more of decabromodiphenyl ethane, triphenyl phosphate, or zinc borate. The antioxidant is specifically one or more of 6-ethoxy-2, 2,4-trimethyl-1, and 2-dihydroquinoline. The plasticizer is specifically one of dioctyl phthalate or dibutyl phthalate. The silane coupling agent is specifically one of KH560 and Si69.

4. A process for the production of a stretch- resistant packaging wrapping film according to claim 1, characterized in that, In step S2, the selected LLDPE granules, PP granules, PIB masterbatch and trifluorochloroethylene copolymer granules are respectively sent to the cleaning equipment for washing. The washing time is maintained at 40-60 minutes. After washing, they are placed in a disc filter for filtration. Then, the washed raw materials are placed in a rotary vacuum dryer for drying. The drying time is maintained at 15-25 minutes.

5. The method for preparing a tensile-resistant packaging stretch film according to claim 1, characterized in that, In step S3, LLDPE granules, PP granules, PIB masterbatch, and trifluorochloroethylene copolymer granules are selected and placed in a mixer for mixing. The mixture is heated to 220-240°C to ensure that the granular raw materials are completely mixed to form a melt. After stirring evenly, a mixture is obtained.

6. The method for preparing a tensile-resistant packaging stretch film according to claim 1, characterized in that, In step S4, the plastic melt in the mixer is fed into a twin-screw extruder for high-temperature extrusion, and the temperature of the plastic melt being extruded in the twin-screw extruder is maintained at 205-230℃.

7. The method for preparing a tensile-resistant packaging stretch film according to claim 1, characterized in that, In step S5, the extruded plastic melt is fed into a casting machine to cast into a film, so as to facilitate the migration of the adhesive and obtain a polyethylene wrapping film. The temperature of the casting cooling roller is controlled at 30-35°C.

8. A process for the production of a stretch- resistant packaging wrapping film according to claim 1, characterized in that, In step S6, the selected polyethylene wrapping film is introduced into a cooling roller for cooling and stretching, and then the wrapping film is transferred to a calendering device for calendering. The temperature of the cooling roller is controlled at 20-30℃, and the winding tension is controlled at 6-8kg.

9. A process for the production of a stretch- resistant packaging wrapping film according to claim 1, characterized in that, In step S7, the produced stretch film undergoes quality inspection, with checks on its size, smoothness, and transparency. It is then rolled up to form a large master roll, which is then packaged.

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