Degradable production process of environment-friendly gauze PET dust-free film

Abstract

The invention discloses a degradable production process of an environment-friendly gauze PET dust-free film, and relates to the technical field of PET films, raw materials are pretreated to improve the purity and processability of the raw materials, then the raw materials are subjected to melt extrusion and film blowing molding, and then stretching setting adjustment and surface modification treatment are performed to obtain the environment-friendly gauze PET dust-free film. And finally, post-treatment and quality control are carried out. According to the degradable gauze PET dust-free film disclosed by the invention, the bio-based degradable additive is added, so that the film can be quickly decomposed in a natural environment or a specific condition, the pollution to the environment is reduced, and the problems that a common PET film is difficult to degrade in the natural environment and causes pollution to the environment after being accumulated for a long time are solved; as the degradable film can be naturally decomposed to a certain extent, the accumulation and treatment pressure of the wastes can be reduced, and the cyclic utilization of resources and the sustainable development of the environment can be realized.

Description

Technical Field

[0001] The invention relates to the technical field of PET films, in particular to a degradable production process of an environmentally friendly gauze PET dust-free film. Background Art

[0002] PET film, full name polyethylene terephthalate film, is a thermoplastic polyester film with excellent performance, excellent transparency, glossiness, mechanical strength, chemical stability and electrical insulation. It is widely used in packaging, electronics, construction, medical and other fields, such as food packaging, capacitor insulation materials, solar photovoltaic backplanes, pharmaceutical packaging, etc. PET film not only has excellent physical and chemical properties, but also has recyclability and processability. It can be processed through various processes such as thermoforming, printing, and lamination to meet the needs of different customers.

[0003] After use, PET film is easily discarded in the natural environment and cannot be recycled in time. Ordinary PET film is difficult to degrade in the natural environment, and long-term accumulation will cause environmental pollution. Therefore, an environmentally friendly gauze PET dust-free film degradable production process is proposed. Summary of the invention

[0004] The purpose of the present invention is to provide an environmentally friendly gauze PET dust-free film degradable production process to solve the problem that ordinary PET film mentioned in the above background technology is difficult to degrade in the natural environment and long-term accumulation will cause environmental pollution.

[0005] To achieve the above object, the present invention provides the following technical solution: a biodegradable production process of an environmentally friendly tulle PET dust-free film, comprising the following steps: S1, raw material pretreatment; S2, melt extrusion and film blowing; S3, stretching, shaping and surface modification; S4. Post-processing and quality control.

[0006] Preferably, the raw material pretreatment comprises the following steps: S11, pre-treating the raw materials by drying and removing impurities to improve the purity and processing performance of the raw materials; S12, pre-crystallizing the PET slices to increase their melting point for easy melt extrusion; S13. Mix the bio-based degradable additive PLA (polylactic acid) with antioxidants, antistatic agents, ultraviolet absorbers and light stabilizers in a uniform ratio, wherein the content of PET chips is 90%, the content of bio-based degradable additive PLA (polylactic acid) is 9%, the content of antioxidants is 0.3%, the content of antistatic agents is 0.2%, and the content of ultraviolet absorbers and light stabilizers is 0.5%.

[0007] Preferably, the melt extrusion comprises the following steps: S21, melting the pre-crystallized polyester chips and the additive mixture at a high temperature, and extruding the melt through a screw extruder; S22, filtration and degassing, remove impurities and bubbles in the melt to ensure the purity and smoothness of the film.

[0008] Preferably, the film blowing molding comprises the following steps: S23, blowing the extruded melt into a film through a film blowing tube; S24, rapidly cooling the stretched and oriented PET film by a cooling roller to rapidly solidify the film; S25, further cooling and shaping the PET film through a cooling and shaping device.

[0009] Preferably, the stretching, shaping and surface modification comprises the following steps: S31, stretching the blown PET film longitudinally and transversely through a longitudinal stretching machine and a transverse stretching machine to improve its strength and barrier properties; S32, stably forming the stretched PET film by heat treatment; S33. Coating a degradable coating on the surface of the PET film or performing a bio-enzyme treatment to improve the degradability and biocompatibility of the film.

[0010] Preferably, the post-processing and quality control comprises the following steps: S41, winding, using an automatic winder to wind the cooled and solidified PET film into a roll; S42, cutting, cutting the PET film into a specific length or width; S43. Carry out strict inspection and testing on the thickness, strength, degradation performance, etc. of the film to ensure stable and reliable product quality.

[0011] Preferably, the screw extruder heats and melts the PET raw material by means of a heated and rotating screw to form a molten plastic paste, and extrude the molten PET paste into a film blank of a desired shape; Preferably, the cooling roller rapidly solidifies the stretched and oriented PET film by rapid cooling; Preferably, the cooling and shaping device is used to further cool and shape the film; Preferably, the longitudinal stretching machine is used to longitudinally stretch the film blank so that the molecular chains are arranged more closely in the stretching direction, thereby improving the longitudinal strength and stability of the film; Preferably, the transverse stretching machine is used to transversely stretch the longitudinally stretched film, so as to arrange the molecular chains more closely in the stretching direction, thereby increasing the transverse strength and stability of the film; Preferably, the automatic winding machine is used to wind the cooled and solidified PET film into a roll to facilitate subsequent processing and use.

[0012] In the present invention, bio-based degradable additives are added to the degradable gauze PET dust-free film, so that the film can be decomposed faster in a natural environment or under specific conditions, reducing pollution to the environment, solving the problem that ordinary PET films are difficult to degrade in a natural environment and long-term accumulation will cause pollution to the environment; reducing waste: since the degradable film can be naturally decomposed to a certain extent, it can reduce the accumulation and treatment pressure of waste, which is helpful to achieve the recycling of resources and sustainable development of the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The present invention is a flow chart of the biodegradable production process of an environmentally friendly gauze PET dust-free film. DETAILED DESCRIPTION

[0014] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0015] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] Embodiment 1 See also Figure 1 As shown, a biodegradable production process of an environmentally friendly tulle PET dust-free film comprises the following steps: Step 1: pretreatment of raw materials; Specifically, the raw materials are dried, impurity-removed and other pretreatments are performed to improve the purity and processing performance of the raw materials; the PET chips are pre-crystallized to increase their melting point for easy melt extrusion; the bio-based degradable additive PLA (polylactic acid) is evenly mixed with antioxidants, antistatic agents, ultraviolet absorbers and light stabilizers according to a ratio, the PET chips content is 90%, the bio-based degradable additive PLA (polylactic acid) content is 9%, in order to increase the degradability of the film, the bio-based degradable additive PLA (polylactic acid) is selected, the bio-based degradable additive can be decomposed quickly in nature, and reduce pollution to the environment; the antioxidant content is 0.1%; the antistatic agent content is 0.2%, and the antistatic agent is added to improve the antistatic performance of the film; the ultraviolet absorber and light stabilizer content is 0.7%, in order to improve the weather resistance of the film, an appropriate amount of ultraviolet absorber and light stabilizer are added, which can absorb or reflect ultraviolet rays to prevent the film from aging due to ultraviolet radiation.

[0018] Step 2: melt extrusion and film blowing; Specifically, melt extrusion includes: melting the pre-crystallized polyester chips and additive mixture at high temperature, extruding the melt through a screw extruder. During the extrusion process, it is necessary to control parameters such as the melt temperature and screw speed to ensure the purity and uniformity of the melt; filtering and degassing to remove impurities and bubbles in the melt to ensure the purity and smoothness of the film; Specifically, the blown film forming includes: blowing the extruded melt into a film through a film blowing tube, and the thickness and width of the film can be controlled by adjusting the diameter of the film blowing tube, the blowing ratio and other parameters; rapidly cooling the stretched and oriented PET film through a cooling roller to rapidly solidify the PET film; and further cooling and shaping the PET film through a cooling and shaping device.

[0019] Step 3: stretching, shaping and surface modification; Specifically, the blown PET film is stretched longitudinally and transversely by a longitudinal stretching machine and a transverse stretching machine to improve its strength and barrier properties. The longitudinal stretching machine stretches the film blank longitudinally to make the molecular chains arrange more closely in the stretching direction, thereby improving the longitudinal strength and stability of the film. The stretched PET film is stably formed by heat treatment. The transverse stretching machine stretches the longitudinally stretched film transversely to also make the molecular chains arrange more closely in the stretching direction, thereby increasing the transverse strength and stability of the film. Biaxial stretching can significantly improve the physical properties of the film. A degradable coating is coated on the surface of the PET film or a bio-enzyme treatment is performed to improve the degradability and biocompatibility of the film.

[0020] Step 4: Post-processing and quality control; Specifically, in winding, the cooled and solidified PET film is wound into a roll using an automatic winder. The tension needs to be controlled during the winding process to ensure that the film is neatly wound and to avoid problems such as static electricity. In cutting, the PET film is cut into specific lengths or widths. The thickness, strength, and degradation properties of the film are strictly inspected and tested to ensure stable and reliable product quality.

[0021] Embodiment 2 The present invention provides an environmentally friendly gauze PET dust-free film degradable production process, which is further expanded according to the content of the specific embodiment 1: The screw extruder heats and melts the PET raw material through the heated and rotating screw to form a molten plastic paste, and extrude the molten PET paste into a film blank of a desired shape; The cooling roller quickly solidifies the stretched and oriented PET film by rapid cooling; A cooling and shaping device is used to further cool and shape the film; Longitudinal stretching machine, used to stretch the film blank longitudinally, so that the molecular chains are arranged more closely in the stretching direction, and the longitudinal strength and stability of the film are improved; The transverse stretching machine is used to stretch the longitudinally stretched film transversely, which also makes the molecular chains more closely arranged in the stretching direction, thereby increasing the transverse strength and stability of the film. The automatic winding machine is used to wind the cooled and solidified PET film into a roll for subsequent processing and use.

[0022] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A biodegradable production process of an environmentally friendly tulle PET dust-free film, characterized in that: The following steps are involved: S1. Raw material pretreatment to improve the purity and processing performance of raw materials; S2, melt extrusion and film blowing; S3, stretching, shaping and surface modification; S4. Post-processing and quality control.

2. The biodegradable production process of an environmentally friendly tulle PET dust-free film according to claim 1, characterized in that: In step S1, the raw material pretreatment includes the following steps: S11, pre-treating the raw materials by drying and removing impurities to improve the purity and processing performance of the raw materials; S12, pre-crystallizing the PET slices to increase their melting point for easy melt extrusion; S13. Mix the bio-based degradable additive PLA (polylactic acid) with antioxidants, antistatic agents, ultraviolet absorbers and light stabilizers in a uniform ratio, wherein the content of PET chips is 90%, the content of bio-based degradable additive PLA (polylactic acid) is 9%, the content of antioxidants is 0.3%, the content of antistatic agents is 0.2%, and the content of ultraviolet absorbers and light stabilizers is 0.5%.

3. The degradable production process of an environmentally friendly tulle PET dust-free film according to claim 1 is characterized in that: In step S2, the melt extrusion comprises the following steps: S21, melting the pre-crystallized polyester chips and the additive mixture at a high temperature, and extruding the melt through a screw extruder; S22, filtration and degassing, remove impurities and bubbles in the melt to ensure the purity and smoothness of the film.

4. The degradable production process of an environmentally friendly tulle PET dust-free film according to claim 1 is characterized in that: In step S2, the film blowing includes the following steps: S23, blowing the extruded melt into a film through a film blowing tube; S24, rapidly cooling the stretched and oriented PET film by a cooling roller to rapidly solidify the film; S25, further cooling and shaping the PET film through a cooling and shaping device.

5. The degradable production process of an environmentally friendly tulle PET dust-free film according to claim 1, characterized in that: In step S3, the stretching, shaping and surface modification comprises the following steps: S31, stretching the blown PET film longitudinally and transversely through a longitudinal stretching machine and a transverse stretching machine to improve its strength and barrier properties; S32, stably forming the stretched PET film by heat treatment; S33. Coating a degradable coating on the surface of the PET film or performing a bio-enzyme treatment to improve the degradability and biocompatibility of the film.

6. The process for producing an environmentally friendly gauze PET dust-free film according to claim 1, characterized in that: In step S4, the post-processing and quality control includes the following steps: S41, winding, using an automatic winder to wind the cooled and solidified PET film into a roll; S42, cutting, cutting the PET film into a specific length or width; S43. Carry out strict inspection and testing on the thickness, strength, degradation performance, etc. of the film to ensure stable and reliable product quality.

7. The process for producing an environmentally friendly gauze PET dust-free film according to claims 1 to 6, characterized in that: The screw extruder heats and melts the PET raw material through a heated and rotating screw to form a molten plastic paste, and extrude the molten PET paste into a film blank of a desired shape; The cooling roller rapidly solidifies the stretched and oriented PET film by rapid cooling; The cooling and shaping device is used to further cool and shape the film; The longitudinal stretching machine is used to longitudinally stretch the film blank so that the molecular chains are arranged more closely in the stretching direction, thereby improving the longitudinal strength and stability of the film; The transverse stretching machine is used to transversely stretch the longitudinally stretched film, so as to arrange the molecular chains more closely in the stretching direction and increase the transverse strength and stability of the film; The automatic winding machine is used to wind the cooled and solidified PET film into a roll, which is convenient for subsequent processing and use.

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