Composite packaging bag and preparation process thereof

Abstract

The invention provides a preparation process of a composite packaging bag. The preparation process comprises the following steps: S100, making a bag, melting and extruding a raw material film roll; s200, printing, wherein patterns are printed on the thin film; s300, compounding is carried out; s301, the printed thin film is conveyed to a glue spreading roller; s302, the environment temperature Te is obtained, and the temperature Tg of glue in the glue disc is obtained; s303, an interlayer is formed, and the rubber disc is heated; s304, the area in the glue disc is divided into N glue storage areas, and the glue temperatures Tg1, Tg2, Tg3,..., Tgn in the N glue storage areas are obtained; s305, controlling (Tgn-Te) to be greater than or equal to 1 DEG C and less than or equal to 2 DEG C, and enabling Tgmin to be greater than Te; s306, the glue in the Nth glue storage area is transferred to a glue coating roller, and the printed film is coated with the glue; s307, the film coated with the glue is bonded with another layer or multiple layers of materials; s400, performing curing; s500, slitting is carried out; and S600, bag making is carried out. According to the invention, through accurate temperature control, product defects, such as bubbles, layering and wrinkling, caused by poor curing of the adhesive are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of composite packaging bags, in particular to a composite packaging bag and a preparation process thereof. Background Art

[0002] As a multi-purpose packaging material, composite bags are widely used in the packaging of food, electronic products, chemical products, pharmaceutical products, tea, precision instruments and cutting-edge defense products. These composite bags are usually laminated by two or more films with different functionalities, which can provide the protection required for vacuum packaging or conventional packaging.

[0003] The manufacturing process of composite bags mainly includes steps such as bag making, printing, lamination (compounding), cutting and final packaging. Among them, lamination and bag making processes are particularly critical to determine the quality of the final product. Lamination refers to the process of bonding films with different properties together through adhesives, aiming to overcome the limitations of a single film material and combine the advantages of multiple films to form a composite material with better comprehensive performance.

[0004] During the lamination process, the state of the adhesive has an important impact on the quality of the product. In practice, quality problems related to insufficient curing of the adhesive frequently occur. Analyzing the root causes of these problems, it can be found that moisture in the air consumes the curing agent component in the adhesive, thereby affecting the curing effect. Specifically, when the adhesive is exposed to an environment with high humidity, moisture may condense on the adhesive surface, coating roller surface, rubber disc, scraper, and guide roller. This moisture reacts chemically with the isocyanate (-NCO) component contained in the adhesive to generate carbon dioxide gas. This reaction not only consumes the curing agent, but also causes the adhesive layer to fail to fully cure, ultimately causing defects such as bubbles, delamination, and wrinkling, which seriously affects the final performance of the composite bag.

[0005] In view of this, the inventor specially designed a composite packaging bag and its preparation process, and this case was thus generated. Summary of the invention

[0006] In order to solve the above problems, one of the technical solutions of the present invention is as follows:

[0007] A process for preparing a composite packaging bag comprises the following steps:

[0008] S100, film making, selecting raw materials to melt and mix, making them in a molten state and extruding and blow-molding them into raw material film rolls;

[0009] S200, printing, printing patterns on the film of the raw film roll;

[0010] S300, composite;

[0011] S301, transferring the printed film to the glue coating roller and waiting for the transfer roller to transfer the glue in the glue tray for glue coating;

[0012] S302, obtaining the ambient temperature Te, and obtaining the glue temperature Tg in the glue tray;

[0013] S303, forming an interlayer at the bottom of the rubber disc, and introducing hot water medium to heat the rubber disc;

[0014] S304, dividing the area in the rubber disk into N sequentially connected rubber storage areas according to the direction of the flow to the transfer rubber roller, heating the N rubber storage areas with the hot water medium in the interlayer, and obtaining the glue temperatures Tg1, Tg2, Tg3, ..., Tgn in the N rubber storage areas;

[0015] S305, controlling 1°C≤(Tgn-Te)≤2°C, and making Tgmin>Te;

[0016] S306, transferring the glue in the Nth glue storage area to the glue coating roller to coat the printed film with glue;

[0017] S307, bonding the film coated with glue to another layer or multiple layers of materials to form a multi-layer film structure;

[0018] S400, maturation;

[0019] S500, slitting;

[0020] S600, bag making.

[0021] Preferably, in step S303, the liquid in the interlayer flows in a direction from the Nth glue storage area to the 1st glue storage area.

[0022] Preferably, in step S303, the liquid in the interlayer flows in a direction from the first glue storage area to the Nth glue storage area.

[0023] Preferably, in step S303, the interlayer includes a water inlet, a water outlet, and a single-channel waterway connecting the water inlet and the water outlet, and the single-channel waterway is distributed in a serpentine shape between the water inlet and the water outlet.

[0024] Preferably, in step S303, the interlayer includes a water inlet, a water outlet, and a dual-channel waterway connecting the water inlet and the water outlet, and the dual-channel waterway includes two water pipelines that are serpentinely distributed between the water inlet and the water outlet and extend in the same direction.

[0025] Preferably, before step S301, the method further includes: a preheating step of preheating the printed film to a temperature close to that of the glue.

[0026] Preferably, in step S303, a flow control device is further provided in the interlayer for dynamically adjusting the flow rate of the hot water medium according to changes in the ambient temperature Te.

[0027] The second technical solution of the present invention is as follows:

[0028] A composite packaging bag, consisting of the following components:

[0029] An inner layer, composed of low-density polyethylene, linear low-density polyethylene, an antioxidant and a slip agent, wherein the total mass fraction of the low-density polyethylene and the linear low-density polyethylene accounts for 50% of the total mass fraction of the inner layer;

[0030] An intermediate layer, consisting of an aluminum foil layer, a polyvinylidene chloride coating and an adhesive, wherein the weight fraction of the aluminum foil layer accounts for 50% of the total weight fraction of the intermediate layer;

[0031] The outer layer is composed of biaxially stretched polyester, a surface treatment agent and an antistatic agent, wherein the mass fraction of the biaxially stretched polyester accounts for 98% of the total mass fraction of the outer layer.

[0032] Preferably, the mass fraction of the antioxidant in the inner layer is 0.5 parts, the mass fraction of the slip agent is 0.5 parts, the mass fraction of the polyvinylidene chloride coating in the middle layer is 5.5 parts, the mass fraction of the adhesive is 5.5 parts, the mass fraction of the surface treatment agent in the outer layer is 0.5 parts, and the mass fraction of the antistatic agent is 0.5 parts.

[0033] The composite packaging bag and the preparation process thereof proposed by the present invention mainly solve the problem of insufficient curing of adhesive in the composite bag production process in the prior art, thereby improving the quality of the composite packaging bag.

[0034] Among them, the main features are as follows:

[0035] Temperature control: By controlling the temperature difference between the glue temperature in the glue tray and the ambient temperature within a specific range (1℃≤(Tgn-Te)≤2℃), the curing effect of the adhesive is ensured not to be affected by the ambient humidity.

[0036] Heating method: A sandwich layer is set at the bottom of the glue disc, and hot water is used to heat the glue disc to ensure that the glue maintains a uniform temperature during the entire use process.

[0037] Glue area division: Divide the glue area in the glue tray into multiple continuous areas, and heat these areas separately with hot water medium, which helps to ensure the uniformity and stability of the glue temperature.

[0038] Material selection: Use a multi-layer structure with a specific formula, including an inner layer, a middle layer and an outer layer. Each layer contains specific functional materials, such as low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), aluminum foil, polyvinylidene chloride (PVDC) coating, etc. to improve the comprehensive performance of the composite bag.

[0039] Thus, the following effects can be achieved:

[0040] 1. Through precise temperature control, product defects such as bubbles, delamination and wrinkling caused by poor curing of adhesives are avoided.

[0041] 2. The specific material combination is selected to make the composite packaging bag have good barrier properties, puncture resistance and mechanical strength, which is suitable for a variety of packaging needs.

[0042] 3. The optimized heating system helps save energy and reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The drawings described herein are used to provide further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0044] in:

[0045] Figure 1 It is a process flow chart of the present invention;

[0046] Figure 2 It is a schematic diagram of the sandwich structure of Example 1 of the present invention;

[0047] Figure 3 Schematic diagram of the heating channel structure of the first embodiment of the present invention;

[0048] Figure 4 It is a schematic diagram of the sandwich structure of Example 2 of the present invention.

[0049] Description of labels:

[0050] 10. Interlayer; 11. Water inlet; 12. Water outlet; 13. Single-channel waterway; 14. Double-channel waterway; 15. Water pipeline; 20. Heating splint; 21. Heating channel; 22. Heating pipe. DETAILED DESCRIPTION

[0051] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and more understandable, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0052] Embodiment 1

[0053] like Figure 1-3 As shown, a preparation process of a composite packaging bag as a best embodiment of the present invention comprises the following steps:

[0054] S100, film making, selecting raw materials to melt and mix, making them in a molten state and extruding and blow-molding them into raw material film rolls;

[0055] S200, printing, printing patterns on the film of the raw film roll;

[0056] S300, composite;

[0057] S301, transferring the printed film to the glue coating roller and waiting for the transfer roller to transfer the glue in the glue tray for glue coating;

[0058] S302, obtaining the ambient temperature Te, and obtaining the glue temperature Tg in the glue tray;

[0059] S303, forming an interlayer 10 at the bottom of the rubber disc, and introducing hot water medium to heat the rubber disc;

[0060] S304, dividing the area in the rubber disk into N sequentially connected rubber storage areas according to the direction of the flow to the transfer rubber roller, heating the N rubber storage areas with the hot water medium in the interlayer 10, and obtaining the glue temperatures Tg1, Tg2, Tg3, ..., Tgn in the N rubber storage areas;

[0061] S305, controlling 1°C≤(Tgn-Te)≤2°C, and making Tgmin>Te;

[0062] S306, transferring the glue in the Nth glue storage area to the glue coating roller to coat the printed film with glue;

[0063] S307, bonding the film coated with glue to another layer or multiple layers of materials to form a multi-layer film structure;

[0064] S400, maturation;

[0065] S500, slitting;

[0066] S600, bag making.

[0067] In this embodiment, Tg min That is, the minimum value among Tg1, Tg2, Tg3, ..., Tgn. Keeping the minimum value greater than the ambient temperature can maintain the properties of the glue and avoid water absorption affecting the curing effect.

[0068] The raw materials in step S100 include:

[0069] The inner layer is composed of low-density polyethylene, linear low-density polyethylene, antioxidant and slip agent, wherein the total weight of the low-density polyethylene and the linear low-density polyethylene accounts for 50% of the total weight of the inner layer;

[0070] The middle layer is composed of an aluminum foil layer, a polyvinylidene chloride coating and an adhesive, wherein the weight fraction of the aluminum foil layer accounts for 50% of the total weight fraction of the middle layer;

[0071] The outer layer is composed of biaxially stretched polyester, a surface treatment agent and an antistatic agent, wherein the mass fraction of the biaxially stretched polyester accounts for 98% of the total mass fraction of the outer layer.

[0072] Among them, the mass fraction of antioxidant in the inner layer is 0.5 parts, the mass fraction of lubricant is 0.5 parts, the mass fraction of polyvinylidene chloride coating in the middle layer is 5.5 parts, the mass fraction of adhesive is 5.5 parts, the mass fraction of surface treatment agent in the outer layer is 0.5 parts, and the mass fraction of antistatic agent is 0.5 parts.

[0073] Specifically, in this embodiment, the temperature of the glue is obtained by a temperature probe, and the temperature probe is suspended and inserted into the glue in each glue storage area to obtain the glue temperature in the corresponding area. In this embodiment, N is 5, that is, the area in the glue tray is divided into 5 glue storage areas which are connected end to end in sequence. After pouring the glue raw material into the first glue storage area, the glue can flow along the adjacent glue storage areas to all 5 glue storage areas.

[0074] In addition, when the temperature of the glue increases, the volatilization rate of ethyl acetate will accelerate, which will lead to a significant increase in the viscosity of the glue and an abnormal increase in the amount of glue applied. In severe cases, it will also lead to deterioration of the glue coating state and the transparency of the composite product. Therefore, a sealing cover plate can be provided on the upper end of each glue storage area after the second glue storage area to prevent the ethyl acetate from volatilizing too quickly. By maintaining the temperature of the glue and the ambient temperature at a lower temperature difference level, it is also helpful to maintain the viscosity of the glue.

[0075] Preferably, in this embodiment, the direction of liquid flow in the interlayer 10 in step S303 is: from the 5th glue storage area to the 1st glue storage area. The purpose of this liquid flow direction setting is: the hot water medium first flows into the 5th glue storage area where the glue is about to be discharged. At this time, the 5th glue storage area is heated first, and the glue temperature in the 5th glue storage area can be changed instantly as needed, and the temperature difference between the glue temperature and the ambient temperature can be quickly adjusted. Compared with the method of starting heating from the first glue storage area when water enters, the feedback is more timely, which is convenient for adjusting and controlling the glue temperature.

[0076] Preferably, in this embodiment, Figure 1As shown, in step S303 , the interlayer 10 includes a water inlet 11 , a water outlet 12 , and a single-channel waterway 13 connecting the water inlet 11 and the water outlet 12 , and the single-channel waterway 13 is distributed in a serpentine shape between the water inlet 11 and the water outlet 12 .

[0077] Specifically, Figure 1 As shown, after the single-channel waterway 13 enters along the right side of the interlayer 10 , it first runs in a serpentine shape between the water inlet 11 and the water outlet 12 , and then flows out vertically along one side of the water outlet 12 .

[0078] Preferably, before step S301, the method further includes: a preheating step of preheating the printed film to a temperature close to that of the glue.

[0079] like Figure 3 As shown, specifically, a heating channel 21 consisting of two heating clamps 20 is provided before the glue coating roller, wherein a serpentine heating tube 22 is provided in one of the heating clamps 20 (bottom), and the heating tube 22 is connected to the water outlet 12 of the bottom interlayer 10 of the glue disc, and the other heating clamp 20 is built-in with a resistance heating device, and the channel temperature Tp in the heating channel 21 is obtained by a temperature probe, and Tp=(Tg-0.1)°C is maintained. The residual heat of the hot water in the glue disc provides an initial temperature rise for the heating channel 21. When Tp cannot meet the set conditions, the resistance heating device is started, so that the heating channel 21 obtains a temperature close to the glue temperature Tg. When the printed film is transferred to the heating channel 21, on the one hand, the printing ink can be cured to a certain extent through Tp, and on the other hand, the film can be heated to a temperature close to the glue through Tp, thereby improving the coating uniformity and curing efficiency.

[0080] Preferably, in step S303, a flow control device is further provided in the interlayer 10 for dynamically adjusting the flow rate of the hot water medium according to changes in the ambient temperature Te.

[0081] Specifically, in this embodiment, the flow control device is an electronic electromagnetic flow valve, through which the flow rate and temperature of the hot water medium can be dynamically adjusted according to changes in ambient temperature to maintain precise control of the glue temperature.

[0082] Embodiment 2

[0083] like Figure 4 As shown, as a preparation process of a composite packaging bag of the second embodiment of the present invention, the difference from the first embodiment is that the flow direction of the liquid in the interlayer 10 in step S303 is: from the first glue storage area to the fifth glue storage area.

[0084] Compared with Example 1, the method of flowing in from the first glue storage area, combined with the temperature monitoring of the Nth (i.e., the 5th in this embodiment) glue storage area, keeps Tgn (i.e., Tg5) 1-2°C higher than the ambient temperature. The glue temperature in all glue storage areas is higher than the ambient temperature, thereby avoiding the phenomenon of condensation and water absorption caused by the temperature in a certain glue storage area being lower than the ambient temperature.

[0085] Compared with the reverse flow method in the first embodiment, this method is slower in adjusting the temperature, but more energy-efficient and provides more stable temperature control.

[0086] Preferably, in this embodiment, in step S303, the interlayer 10 includes a water inlet 11, a water outlet 12 and a dual-channel waterway 14 connecting the water inlet 11 and the water outlet 12, and the dual-channel waterway 14 includes two water supply pipelines 15 that are serpentinely distributed between the water inlet 11 and the water outlet 12 and extend in the same direction.

[0087] Specifically, after entering along the right side of the interlayer 10 , the two water pipelines 15 are first distributed in parallel in the same direction between the water inlet 11 and the water outlet 12 , and have a serpentine direction, and then flow out vertically along one side of the water outlet 12 .

[0088] Embodiment 3

[0089] A composite packaging bag, consisting of the following components:

[0090] An inner layer, composed of low-density polyethylene, linear low-density polyethylene, an antioxidant and a slip agent, wherein the total mass fraction of the low-density polyethylene and the linear low-density polyethylene accounts for 50% of the total mass fraction of the inner layer;

[0091] An intermediate layer, consisting of an aluminum foil layer, a polyvinylidene chloride coating and an adhesive, wherein the weight fraction of the aluminum foil layer accounts for 50% of the total weight fraction of the intermediate layer;

[0092] The outer layer is composed of biaxially stretched polyester, a surface treatment agent and an antistatic agent, wherein the mass fraction of the biaxially stretched polyester accounts for 98% of the total mass fraction of the outer layer.

[0093] Preferably, the mass fraction of the antioxidant in the inner layer is 0.5 parts, the mass fraction of the slip agent is 0.5 parts, the mass fraction of the polyvinylidene chloride coating in the middle layer is 5.5 parts, the mass fraction of the adhesive is 5.5 parts, the mass fraction of the surface treatment agent in the outer layer is 0.5 parts, and the mass fraction of the antistatic agent is 0.5 parts.

[0094] Experimental testing

[0095] Test items:

[0096] Peel strength, appearance quality, production energy consumption

[0097] Experimental groups:

[0098] Two groups of samples were prepared, one group was prepared according to the traditional process (control group), and the other group was prepared according to the improved process (experimental group).

[0099] Condition control:

[0100] Make sure that other conditions (such as adhesive type, raw film roll type, etc.) are the same except for heating and temperature control.

[0101] Data Records:

[0102] Test items Control group Experimental Group Peel strength (N / 15mm) 2.3 3.2 Appearance quality There are a few bubbles and stratification No obvious bubbles and delamination Production energy consumption (kWh / ton) 50 45

[0103] Data Analysis:

[0104] 1. The peel strength of the composite packaging bag prepared by the improved process is significantly higher than that of the traditional process, which shows that the improved process can significantly improve the bonding performance of the composite film;

[0105] 2. The composite packaging bags produced by the improved process have better appearance quality, without obvious bubbles and stratification, which shows that the improved process can effectively reduce adverse reactions in the production process;

[0106] 3. Although the improved process requires an additional heating step, overall its production energy consumption has slightly decreased due to improved production efficiency and reduced scrap rate.

[0107] The composite packaging bag and the preparation process thereof proposed by the present invention mainly solve the problem of insufficient curing of adhesive in the composite bag production process in the prior art, thereby improving the quality of the composite packaging bag.

[0108] Among them, the main features are as follows:

[0109] Temperature control: By controlling the temperature difference between the glue temperature in the glue tray and the ambient temperature within a specific range (1℃≤(Tgn-Te)≤2℃), the curing effect of the adhesive is ensured not to be affected by the ambient humidity.

[0110] Heating method: A sandwich layer is set at the bottom of the glue disc, and hot water is used to heat the glue disc to ensure that the glue maintains a uniform temperature during the entire use process.

[0111] Glue area division: Divide the glue area in the glue tray into multiple continuous areas, and heat these areas separately with hot water medium, which helps to ensure the uniformity and stability of the glue temperature.

[0112] Material selection: Use a multi-layer structure with a specific formula, including an inner layer, a middle layer and an outer layer. Each layer contains specific functional materials, such as low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), aluminum foil, polyvinylidene chloride (PVDC) coating, etc. to improve the comprehensive performance of the composite bag.

[0113] Thus, the following effects can be achieved:

[0114] 1. Through precise temperature control, product defects such as bubbles, delamination and wrinkling caused by poor curing of adhesives are avoided.

[0115] 2. The specific material combination is selected to make the composite packaging bag have good barrier properties, puncture resistance and mechanical strength, which is suitable for a variety of packaging needs.

[0116] 3. The optimized heating system helps save energy and reduce production costs.

[0117] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A process for preparing a composite packaging bag, characterized in that: The steps include: S100, film making, selecting raw materials to melt and mix, making them in a molten state and extruding and blow-molding them into raw material film rolls; S200, printing, printing patterns on the film of the raw film roll; S300, composite; S301, transferring the printed film to the glue coating roller and waiting for the transfer roller to transfer the glue in the glue tray for glue coating; S302, obtaining the ambient temperature Te, and obtaining the glue temperature Tg in the glue tray; S303, forming an interlayer (10) at the bottom of the rubber disc, and introducing hot water medium to heat the rubber disc; S304, dividing the area in the rubber disk into N sequentially connected rubber storage areas according to the direction of the flow to the transfer rubber roller, heating the N rubber storage areas with the hot water medium in the interlayer (10), and obtaining the glue temperatures Tg1, Tg2, Tg3, ..., Tgn in the N rubber storage areas; S305, control 1℃≤(Tgn-Te)≤2℃, and make Tg min >Te; S306, transferring the glue in the Nth glue storage area to the glue coating roller to coat the printed film with glue; S307, bonding the film coated with glue to another layer or multiple layers of materials to form a multi-layer film structure; S400, maturation; S500, slitting; S600, bag making.

2. The process for preparing a composite packaging bag according to claim 1, characterized in that: In step S303, the liquid in the interlayer (10) flows in the direction from the Nth glue storage area to the 1st glue storage area.

3. The process for preparing a composite packaging bag according to claim 1, characterized in that: In step S303, the liquid in the interlayer (10) flows in the direction from the first glue storage area to the Nth glue storage area.

4. The process for preparing a composite packaging bag according to claim 1, characterized in that: In step S303, the interlayer (10) includes a water inlet (11), a water outlet (12), and a single-channel water path (13) connecting the water inlet (11) and the water outlet (12), and the single-channel water path (13) is distributed in a serpentine shape between the water inlet (11) and the water outlet (12).

5. The process for preparing a composite packaging bag according to claim 1, characterized in that: In step S303, the interlayer (10) includes a water inlet (11), a water outlet (12), and a dual-channel waterway (14) connecting the water inlet (11) and the water outlet (12), and the dual-channel waterway (14) includes two water pipelines (15) distributed in a serpentine shape between the water inlet (11) and the water outlet (12) and extending in the same direction.

6. The process for preparing a composite packaging bag according to claim 1, characterized in that: Before step S301, the method further includes: a preheating step of preheating the printed film to a temperature close to that of the glue.

7. The process for preparing a composite packaging bag according to claim 1, characterized in that: In step S303, a flow control device is also provided in the interlayer (10) for dynamically adjusting the flow rate of the hot water medium according to changes in the ambient temperature Te.

8. A composite packaging bag prepared according to the preparation process of claim 1, characterized in that: It is composed of the following components: An inner layer, composed of low-density polyethylene, linear low-density polyethylene, an antioxidant and a slip agent, wherein the total mass fraction of the low-density polyethylene and the linear low-density polyethylene accounts for 50% of the total mass fraction of the inner layer; An intermediate layer, consisting of an aluminum foil layer, a polyvinylidene chloride coating and an adhesive, wherein the weight fraction of the aluminum foil layer accounts for 50% of the total weight fraction of the intermediate layer; The outer layer is composed of biaxially stretched polyester, a surface treatment agent and an antistatic agent, wherein the mass fraction of the biaxially stretched polyester accounts for 98% of the total mass fraction of the outer layer.

9. A composite packaging bag according to claim 8, characterized in that: The mass fraction of the antioxidant in the inner layer is 0.5 parts, the mass fraction of the slip agent is 0.5 parts, the mass fraction of the polyvinylidene chloride coating in the middle layer is 5.5 parts, the mass fraction of the adhesive is 5.5 parts, the mass fraction of the surface treatment agent in the outer layer is 0.5 parts, and the mass fraction of the antistatic agent is 0.5 parts.

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