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CN-121973481-A - Preparation post-treatment method and device for composite polyethylene winding film

CN121973481ACN 121973481 ACN121973481 ACN 121973481ACN-121973481-A

Abstract

The invention relates to the technical field of wound film pollution treatment and discloses a preparation post-treatment method and device of a composite polyethylene wound film, which comprises a device frame, wherein an unreeling roller, a solid pollutant removing module, a liquid pollutant removing module, a local residual detecting and removing module and a drying roller are sequentially arranged on the device frame along the film running direction, the solid pollutant removing module comprises a low-temperature hardening roller, a micro-vibration disturbing roller and an adhesive rubber roller which are sequentially arranged along the film running direction, and the grading cooperative treatment of the surface and the internal pollutant of the composite polyethylene wound film is realized through the solid pollutant removing module, the liquid pollutant removing module and the local residual detecting and removing module which are sequentially arranged along the film running direction, so that the problem of continuous migration of the internal pollutant to the surface is solved, the surface cleanliness of the treated film is high, the performance is stable, the airtight collection treatment of the volatile matters is realized, the secondary pollution is avoided, and the comprehensive running cost is remarkably reduced.

Inventors

  • ZHANG SULING
  • FANG LIMEI
  • XU MINGGUO

Assignees

  • 上海徽淮包装材料有限公司

Dates

Publication Date
20260505
Application Date
20260327

Claims (10)

  1. 1. The preparation aftertreatment device for the composite polyethylene winding film is characterized by comprising a device frame (1), wherein an unreeling roller (2), a solid pollutant removing module (3), a liquid pollutant removing module (4), a local residue detecting and removing module (5) and a drying roller (6) are sequentially arranged on the device frame (1) along the running direction of the film; the solid pollutant removing module (3) comprises a low-temperature hardening roller (34), a micro-vibration disturbing roller (31) and an attaching rubber roller (32) which are sequentially arranged along the running direction of the film, wherein the micro-vibration disturbing roller (31) is used for separating solid particles on the surface of the film, and the attaching rubber roller (32) is used for capturing the separated solid particles; The liquid pollutant removal module (4) comprises a closed negative pressure bin (41), wherein two contact heating rollers (44), a spreading and release promoting area (42) and an air knife assembly (45) are sequentially arranged in the negative pressure bin (41) along the film running direction, wherein the two contact heating rollers are arranged up and down oppositely, the spreading and release promoting area (42) is used for increasing the film volatilization area, and the air knife assembly (45) is used for forming tangential air flow on the film surface; The local residual detection and removal module (5) comprises an optical detection mechanism and a micro-jet nozzle (55), wherein the optical detection mechanism and the micro-jet nozzle are movably arranged along the width direction of the film, the optical detection mechanism is used for detecting local residual pollutants on the surface of the film, and the micro-jet nozzle (55) is used for removing the residual pollutants which are detected and positioned.
  2. 2. The post-treatment device for preparing the composite polyethylene winding film according to claim 1, wherein the micro-vibration disturbing roller (31) and the attaching rubber roller (32) are arranged in an up-down opposite way, and a negative pressure adsorption tube (35) for further capturing free solid particles is arranged above the attaching rubber roller (32); The micro-vibration disturbing roller (31) is an ultrasonic vibration roller, the vibration frequency is 20kHz-50kHz, and the amplitude is 1 μm-10 μm; one side of the adhesive rubber roller (32) is provided with a rubber roller (33), and the rubber roller (33) is used for rolling the solid particles captured on the surface of the adhesive rubber roller (32).
  3. 3. The post-treatment device for preparing the composite polyethylene winding film according to claim 1, wherein a plurality of groups of fixed rollers (421) and movable rollers (424) which are arranged in a staggered manner up and down are arranged in the expanding and releasing promoting area (42) and are used for guiding the film to form an S-shaped or wave-shaped advancing path; Still be equipped with carousel (422) in the stentering and releasing district (42), carousel (422) eccentric part is connected with connecting rod (423), the tip of movable roller (424) rotationally install in connecting rod (423).
  4. 4. The post-treatment device for preparing the composite polyethylene winding film according to claim 1, wherein a lifting driving mechanism (43) positioned above the contact type heating roller (44) is further arranged in the negative pressure bin (41), and a telescopic part of the lifting driving mechanism (43) is connected with the shaft end of the contact type heating roller (44) positioned above.
  5. 5. A post-production treatment device for a composite polyethylene wound film according to claim 1, wherein a cooling medium passage is provided inside the low-temperature hardening roller (34) for cooling the film to 5 ℃ to 15 ℃ to increase the film modulus to enhance vibration transmission efficiency.
  6. 6. The post-processing device for preparing a composite polyethylene winding film according to claim 1, wherein the optical detection mechanism comprises a reflective light emitting end (53) and a reflective light receiving end (54) which are arranged in an up-down opposite manner, the reflective light emitting end (53) is a multi-wavelength LED array, and the reflective light receiving end (54) is a high-sensitivity photoelectric sensor for detecting the difference of the reflective light intensity of the liquid residues on the surface of the film; The local residue detection and removal module (5) further comprises two assembly rods (51) which are arranged in parallel, truss guide rails (52) are arranged on the two assembly rods (51), and the reflected light emitting ends (53) and the micro-jet spray heads (55) are respectively and slidably arranged on the corresponding truss guide rails (52) through guide blocks.
  7. 7. The post-treatment device for preparing the composite polyethylene winding film according to claim 1, wherein the micro-jet nozzle (55) is a piezoelectric micro-nozzle array, the nozzle spacing is 1mm-5mm, the single jet volume is skin upgrading, and the jet frequency is more than or equal to 10kHz; The jet direction of the micro-jet nozzle (55) forms an acute angle with the surface of the film, and a negative pressure suction head (56) is arranged beside the micro-jet nozzle and used for synchronously removing the peeled residual pollutants.
  8. 8. The post-treatment device for preparing the composite polyethylene winding film according to claim 1, further comprising a volatile treatment box (7), wherein the volatile treatment box (7) is connected with the negative pressure bin (41) through a negative pressure pipe (71), and a condensation recovery unit and an activated carbon adsorption unit are arranged in the volatile treatment box.
  9. 9. The post-treatment device for preparing the composite polyethylene winding film according to claim 1, wherein the air knife assembly (45) comprises air floatation rollers (451) symmetrically arranged on the upper side and the lower side of the film, the roller surfaces of the air floatation rollers (451) are full of micropores, and heated compressed air is introduced through an air pipe (454) so as to form tangential air flow on the surface of the film; The aperture of micropores on the surface of the air floatation roller (451) is 0.3-0.8 mm, the temperature of the introduced heating compressed air is 40-60 ℃, and the air flow direction is opposite to the running direction of the film or forms an included angle of 10-30 ℃; Guide plates (452) which extend downwards in opposite directions are arranged below the two air floatation rollers (451), drainage grooves (453) are formed in the lower end portions of the two guide plates (452), and the drainage grooves (453) extend to the outside of the device frame (1).
  10. 10. The preparation post-treatment method of the composite polyethylene winding film is characterized by comprising the following steps of: S1, conveying the composite polyethylene winding film through a low-temperature hardening area, cooling the film to 5-15 ℃ and improving the film modulus, wherein the low-temperature hardening area is provided with a low-temperature hardening roller (34); S2, conveying the film after low-temperature hardening through a micro-vibration disturbance area, separating solid particles on the surface of the film by utilizing ultrasonic vibration with the frequency of 20kHz-50kHz and the amplitude of 1-10 mu m, capturing the separated solid particles by an adhesion rubber roller (32), and sucking the free particles by a negative pressure adsorption pipe (35), wherein the micro-vibration disturbance area is provided with a micro-vibration disturbance roller (31), and the micro-vibration disturbance roller (31) is an ultrasonic vibration roller; S3, a liquid pollutant releasing step, namely conveying the film into a closed negative pressure bin (41), and sequentially passing through a heating zone, a stentering and releasing area (42) and an air knife assembly (45) under a negative pressure environment; the heating zone heats the film to 60-80 ℃ through a contact heating roller (44) so as to activate volatile matters in the film; The expanding and releasing promoting area (42) is matched with the fixed roller (421) through a plurality of groups of adjustable movable rollers (424) which are staggered up and down, and the film is guided to form an S-shaped or wave-shaped path, so that the tensile strain of the film is controlled within the range of 5% -15%, and the volatilization area is increased; the air knife assembly (45) sprays heated compressed air at 40-60 ℃ to the surface of the film through air floating rollers (451) symmetrically arranged on the upper side and the lower side of the film to form tangential airflow to thin a volatile diffusion boundary layer; S4, a local residual detection and removal step, namely conveying the processed film through an optical detection area, adopting a multi-wavelength LED array as a reflected light emitting end (53) of an emitting light source, receiving reflected light through a reflected light receiving end (54) of a high-sensitivity photoelectric sensor, and identifying the local residual pollutant position on the surface of the film based on the difference of reflected light intensity; according to the detection positioning result, jetting cleaning liquid to the position of the residual pollutant through a micro-jet nozzle (55) of the piezoelectric type micro-nozzle array, and synchronously sucking the stripped residual through a negative pressure suction head (56); s5, a drying step, namely conveying the film subjected to the removal treatment through a drying roller (6) to remove residual water or cleaning liquid on the surface; And S6, a volatile matter treatment step, namely conveying the volatile matter-containing gas extracted from the negative pressure bin (41) in the step S3 to a volatile matter treatment box (7) through a negative pressure pipe (71), and discharging the volatile matter-containing gas after treatment by a condensation recovery unit (72) and an activated carbon adsorption unit (73).

Description

Preparation post-treatment method and device for composite polyethylene winding film Technical Field The invention relates to the technical field of wound film pollution treatment, in particular to a preparation post-treatment method and device of a composite polyethylene wound film. Background The composite polyethylene winding film is widely applied to the fields of logistics transportation, food preservation, industrial product packaging and the like due to excellent tensile property, transparency and packaging adaptability, and in the production process of the composite polyethylene winding film, various types of pollutants are inevitably generated in the film and on the surface due to the process factors such as raw material purity, polymerization reaction residues, addition of processing aids, high-temperature melt extrusion and the like; 1. Gel particles which are not completely melted in raw materials, dust in a production environment, metal scraps (particle size of 1-50 mu m) generated by equipment abrasion and polyethylene micro scraps generated by friction between a film and a guide roller in the transmission process, wherein the particle sizes are small (0.5-50 mu m), conventional sweeping or contact cleaning is difficult to thoroughly remove, and the polyethylene micro scraps are easily adsorbed on the film surface under the action of static electricity; 2. low molecular weight oligomers (molecular weight 500-2000) remained in the polyethylene polymerization process, slipping agents (erucamide and oleamide) added for improving the service performance and processing aid residues, which migrate to the surface of the film during high-temperature processing or storage to form oily foggy spots or thin layers (thickness 10-100 nm), and seriously affect the transparency of the film and the processing performance of subsequent printing, compounding and the like; 3. residual monomers, solvents or micromolecular hydrocarbons generated by thermal decomposition are slowly released in the storage or use process of the film, so that the quality of the product is influenced, and the damage to the environment and human health is also possible; the prior art generally focuses on the physical removal of surface pollutants, and cannot treat potential pollutants which are permeated or dissolved in the film, and the internal pollutants can continuously migrate to the surface (reverse osmosis effect), so that the cleaned film surface is polluted again in a short time, and the quality stability and the subsequent processing adaptability of the product are seriously affected. Disclosure of Invention The invention aims to provide a preparation post-treatment method and device for a composite polyethylene winding film, and aims to solve the problems in the prior art. The invention is realized in such a way that the preparation post-treatment device of the composite polyethylene winding film comprises a device frame, wherein an unreeling roller, a solid pollutant removing module, a liquid pollutant removing module, a local residue detecting and removing module and a drying roller are sequentially arranged on the device frame along the running direction of the film; The solid pollutant removing module comprises a low-temperature hardening roller, a micro-vibration disturbing roller and an attaching rubber roller which are sequentially arranged along the running direction of the film, wherein the micro-vibration disturbing roller is used for separating solid particles on the surface of the film, and the attaching rubber roller is used for capturing the separated solid particles; the liquid pollutant removing module comprises a closed negative pressure bin, wherein two contact heating rollers, a spreading and releasing area and an air knife assembly, wherein the two contact heating rollers are arranged in the negative pressure bin in a vertically opposite mode, the spreading and releasing area is used for increasing the volatilization area of the film, and the air knife assembly is used for forming tangential air flow on the surface of the film; the local residual detection and removal module comprises an optical detection mechanism and a micro-jet nozzle, wherein the optical detection mechanism and the micro-jet nozzle are movably arranged along the width direction of the film, the optical detection mechanism is used for detecting local residual pollutants on the surface of the film, and the micro-jet nozzle is used for removing the residual pollutants which are detected and positioned. Preferably, the micro-vibration disturbing roller and the adhesive rubber roller are arranged up and down oppositely, and a negative pressure adsorption tube for further capturing free solid particles is arranged above the adhesive rubber roller; the micro-vibration disturbing roller is an ultrasonic vibration roller, the vibration frequency is 20kHz-50kHz, and the vibration amplitude is 1-10 mu m; One side of the adhesive rubber roller is