Production process and equipment for integrally producing polyester strapping tape by using waste plastic

Abstract

The invention discloses a production process for integrally producing a polyester strapping tape by utilizing waste plastics. Waste plastic passes through a platform, unpacking, first-time conveying (iron removal and strong magnetism), rotary screening, first-time air conveying, a first-time stock bin, manual sorting, second-time conveying (iron removal and strong magnetism), label removing, second-time air conveying, a second-time stock bin, bottle sorting, material sorting, third-time air conveying, a third-time stock bin, pre-washing, crushing, first-time friction washing, first-time dewatering, a first-time deep water tank and second-time dewatering; the technology comprises the steps of first label separation, fourth air conveying, fourth bin treatment, hot washing, third dehydration, second water tank treatment, second friction washing, fourth dehydration, second label separation, eddy current treatment, material selection, color selection, aging selection, fifth bin treatment, fifth air conveying, pre-drying, drying, melting extrusion, first filtration, reaction kettle treatment, first metering conveying and second filtration. And metering, conveying, stretching and shaping for the second time to obtain the polyester strapping tape. The production line of the technology is high in automation degree, recycled waste plastic is directly utilized, various impurities in PET bottle chips are fully eliminated, and the polyester strapping tape obtained through extrusion stretching forming has the advantages of being high in tensile strength, good in extensibility, resistant to aging, resistant to flame and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of polyester strapping belt production, and particularly relates to a production process and equipment for integrally producing polyester strapping belts from waste plastics. Background Art

[0002] As people's technical requirements for packaging are getting higher and higher, polyester strapping belts are used in more and more occasions. The raw material of polyester strapping belts is PET bottle chips. In order to minimize production costs, many manufacturers currently recycle PET bottle chips. During the recycling process, the biggest problem is that PET bottle chips contain a lot of impurities, especially sediment, labels, label glue, and various oils and fats. The current water washing process mainly has the problems of low automation and inability to fully remove various impurities in PET bottle chips. Summary of the Invention

[0003] The purpose of the present invention is to provide a production process and equipment for integrally producing polyester strapping belts from waste plastics in view of the above problems.

[0004] On the one hand, a production process for integrally producing polyester strapping belts from waste plastics provided by the present invention is as follows: waste plastics are subjected to platform, unpacking, first conveying, rotary screening, first pneumatic conveying, first bin, manual sorting, second conveying, label removal, second pneumatic conveying, second bin, bottle sorting, material sorting, third pneumatic conveying, third bin, pre-washing, crushing, first friction washing, first dehydration, first deep water tank, second dehydration, first label separation, fourth pneumatic conveying, fourth bin, hot washing, third dehydration, second water tank, second friction washing, fourth dehydration, second label separation, eddy current, material selection, color selection, aging selection, fifth bin, fifth pneumatic conveying, pre-drying, drying, melting and extrusion, first filtration, reaction kettle, first metering and conveying, second filtration, second metering and conveying, stretching, and shaping to obtain polyester strapping belts. Both the first conveying and the second conveying include strong magnetic iron removal.

[0005] In some embodiments, the unpacking includes the following steps: unpacking the waste plastic packages conveyed by the platform.

[0006] In some embodiments, the label removal includes the following steps: removing label paper, bottle caps, and stone impurities from the conveyed waste plastics in the screening area, and only leaving the waste bottle bodies.

[0007] In some embodiments, the bottle sorting and material sorting include the following steps: removing non-PET bottles such as PVC bottles, aluminum cans, PP bottles, and PE bottles to obtain the final PET bottles.

[0008] In some embodiments, the crushing process includes the following steps: crushing pre-washed PET bottle bricks into bottle flakes with a size of 10-30 mm.

[0009] In some embodiments, the first friction washing, the first dehydration, the first deep water tank, the second dehydration, the first label separation, the fourth pneumatic conveying, the fourth silo, the hot washing, the third dehydration, the second water tank, the second friction washing, and the fourth dehydration include the following steps: passing the bottle flakes through the friction of a friction machine, the dehydration of a dehydration machine, the rinsing of a rinsing tank, the dehydration of a dehydration machine, and then entering a steam boiler containing caustic soda and a cleaning agent; the temperature of the steam boiler is 95-100 °C, the ratio of water, caustic soda and cleaning agent in the steam boiler is 1000:(1-10):(1-10), the pH value is greater than 7, and the bottle flakes coming out of the steam boiler enter a dehydration machine for dehydration, a rinsing tank for rinsing, a friction machine for friction, and a dehydration machine for dehydration.

[0010] In some embodiments, the color sorter selects the bottle flakes of unwanted colors to obtain the bottle flakes of desired colors.

[0011] In some embodiments, the drying, melting and extrusion, the first filtration, the reaction kettle, the first metering and conveying, the second filtration, the second metering and conveying, the stretching, and the shaping include the following steps:

[0012] Placing the bottle flakes in a drying tower for drying, the temperature of the drying tower is set at 140-180 °C, and the drying time is more than 4 hours;

[0013] Conveying the dried bottle flakes to an extruder, the continuous production extrusion speed is 700-2000 Kg / h, and antioxidants, flame retardants, elastomers, colorants and other auxiliary materials are added during the melting and extrusion process;

[0014] Among them, the antioxidants include but are not limited to phosphorus-based antioxidants such as TNPP, 168, phenolic antioxidants such as 2,6-di-tert-butylphenol (BHT), sulfur-based antioxidants, natural antioxidants, polymeric phenolic antioxidants and compound antioxidants;

[0015] The flame retardants include but are not limited to organic flame retardants and inorganic flame retardants, halogen-based flame retardants (organic chlorides and organic bromides) and non-halogen ones. Among them, the organic ones are some flame retardants represented by bromine-based, phosphorus-nitrogen-based, nitrogen-based and red phosphorus and its compounds, and the inorganic ones are mainly antimony trioxide, magnesium hydroxide, aluminum hydroxide, silicon-based and other flame retardant systems;

[0016] Elastomers include, but are not limited to, natural rubber, isoprene rubber, polybutadiene rubber, styrene-butadiene rubber, nitrile rubber, chloroprene rubber, butyl rubber, halogenated butyl rubber, brominated butyl rubber, ethylene propylene diene monomer (EPDM) rubber, chlorinated polyether rubber, polyacrylate rubber, silicone rubber, fluorosilicone rubber, fluororubber, chlorosulfonated polyethylene, hydrogenated nitrile rubber, thermoplastic elastomer (TPE), thermoplastic polyolefin elastomer, thermoplastic styrenic elastomer, thermoplastic polyurethane elastomer, thermoplastic polyester elastomer, thermoplastic polyamide elastomer, halogen-containing thermoplastic elastomer, ionic thermoplastic elastomer, ethylene copolymer thermoplastic elastomer, 1,2-polybutadiene thermoplastic elastomer, trans-polyisoprene thermoplastic elastomer, melt-processible thermoplastic elastomer, thermoplastic vulcanizate;

[0017] Colorants include, but are not limited to, titanium dioxide (titanium white), zinc oxide (zinc white), cadmium red, iron(III) oxide, carbon black, chrome yellow, zinc yellow, Hansa yellow;

[0018] The extruded molten PET material is placed in a water-cooling tank for cooling and continuously cooled in the cooling tank, and the temperature in the cooling tank is controlled at 15 - 50 °C;

[0019] The cooled PET tape is wound around a stretching mechanism for the first stretching, and the rotation speed of the first stretching is 10 - 13 rpm. After the first stretching, the first heat setting is carried out. The heating device is a constant-temperature oven, and the temperature is 190 - 260 °C;

[0020] After the first heat setting, the second stretching is carried out, and the rotation speed of the second stretching is 13 - 45 rpm. After the second stretching, the second heat setting is carried out, and the temperature is 210 - 230 °C;

[0021] After the second heating, the third stretching is carried out, and the rotation speed of the third stretching is 30 - 45 rpm;

[0022] After the third stretching, the semi-finished product is shaped and cut or wound up to obtain the finished product.

[0023] On the other hand, a production device for integrally producing polyester strapping tapes using waste plastics provided by the present invention includes a platform, an unpacking machine, a first conveyor, a rotary screen, a first blow molding machine, a second conveyor, a first bin, a first feeding auger, a first material selection platform, a flat bottle paper peeling machine, a double - orifice blow molding machine, a buffer bin, a double auger, a vibrating screen, a second material selection platform, a second feeding auger, a third material selection platform, a second blow molding machine, a second bin, a third feeding auger, a rotary bottle washer, a fourth feeding auger, a crusher, a horizontal auger, a first elevator, a friction washing machine, a dryer, a three - axis water tank, a second elevator, a dryer, a labeling machine, an auger, a second elevator, a steamer, a dehydrator, a first rinsing tank, friction washing, a second rinsing tank, a third rinsing tank, a first material lifting auger, a dehydrator, a first blower, label separation, a second material lifting auger, eddy current, a third material lifting auger, a material classifier, a third bin, a second blower, a pre - drying device, a drying device, a melting device, a reaction kettle, an extruder, a stretching and shaping device, and a packaging machine, which are arranged in sequence according to the production line. The first conveyor and the second conveyor are both provided with magnetic rollers, and the first material selection platform, the second material selection platform, and the third material selection platform are all provided with magnetic rollers.

[0024] In some embodiments, the unpacking machine and the rotary screen are connected by the first conveyor, the first bin and the first blow molding machine are connected by the second conveyor, the first material selection platform and the first bin are connected by the first feeding auger, the vibrating screen and the buffer bin are connected by the double auger, the third material selection platform and the second material selection platform are connected by the second feeding auger, the rotary bottle washer and the second bin are connected by the third feeding auger, the crusher and the rotary bottle washer are connected by the fourth feeding auger, the first elevator and the crusher are connected by the horizontal auger, the second elevator and the labeling machine are connected by the auger, the dehydrator and the third rinsing tank are connected by the first material lifting auger, the eddy current and the label separation are connected by the second material lifting auger, and the material classifier and the eddy current are connected by the third auger.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] A production process for integrally producing polyester strapping tapes using waste plastics obtains polyester strapping tapes through steps such as crushing, screening, cleaning, extrusion, and stretching and shaping from recycled waste plastics. The production line of this process has a high degree of automation, directly uses recycled waste plastics, fully eliminates various impurities in PET bottle chips, and the polyester strapping tapes obtained through extrusion and stretching and shaping have high tensile strength, good extensibility, and characteristics such as anti - aging and flame retardancy. Description of the Drawings

[0027] Figure 1This is a process flow diagram for the integrated production of polyester strapping tapes using waste plastics in an embodiment of the present invention. Detailed implementation mode

[0028] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of this application.

[0029] As Figure 1 shown:

[0030] A production process for the integrated production of polyester strapping tapes using waste plastics. The waste plastics go through a platform, unpacking, first conveying, rotary screening, first pneumatic conveying, first silo, manual sorting, second conveying, label removal, second pneumatic conveying, second silo, bottle sorting, material sorting, color sorting, aging sorting, third pneumatic conveying, third silo, pre-washing, crushing, first friction washing, first dehydration, first deep water tank, second dehydration, first label separation, fourth pneumatic conveying, fourth silo, hot washing, third dehydration, second water tank, second friction washing, fourth dehydration, second label separation, eddy current, material selection, fifth silo, fifth pneumatic conveying, pre-drying, drying, melting and extrusion, first filtration, reaction kettle, first metering and conveying, second filtration, second metering and conveying, stretching, and shaping to obtain polyester strapping tapes. Both the first conveying and the second conveying include strong magnetic iron removal.

[0031] The specific steps are as follows:

[0032] Unpacking includes the following steps: Unpack the waste plastic bags conveyed by the platform.

[0033] The label removal includes the following steps: Remove the label paper, bottle caps, and stone impurities from the conveyed waste plastics in the screening area, leaving only the waste bottle bodies.

[0034] Bottle sorting and material sorting include the following steps: Remove non-PET bottles such as PVC bottles, aluminum cans, PP bottles, and PE bottles to obtain the final PET bottles.

[0035] The crushing process includes the following steps: Crush the pre-washed PET bottle bricks into bottle chips with a size of 10 - 30 mm.

[0036] The bottle chips are successively passed through the friction of a friction machine, dewatered by a dewatering machine, rinsed in a rinsing tank, dewatered by a dewatering machine, and then enter a steamer containing caustic soda and a cleaning agent; the temperature of the steamer is 95 - 100 °C, and the ratio of water, caustic soda, and the cleaning agent in the steamer is 1000:(1 - 10):(1 - 10), with the pH value greater than 7. The bottle chips coming out of the steamer enter a dewatering machine for dewatering, a rinsing tank for rinsing, a friction machine for friction, and a dewatering machine for dewatering.

[0037] The color sorter selects the bottle chips of the unwanted color to obtain the bottle chips of the required color.

[0038] Drying, melting and extrusion, first filtration, reaction kettle, first metering and conveying, second filtration, second metering and conveying, stretching, and shaping include the following steps:

[0039] Place the bottle chips in a drying tower for drying. The temperature of the drying tower is set at 140 - 180 °C, and the drying time is more than 4 hours;

[0040] Convey the dried bottle chips to an extruder. The continuous production extrusion speed is 700 - 2000 Kg / h. During the melting and extrusion process, antioxidants, flame retardants, elastomers, colorants, and other auxiliary materials are added. Among them, the antioxidant is dibutylhydroxytoluene (BHT), the flame retardant is unsaturated resin UPR, the elastomer is TPE / TPR elastomer material, and the colorant is titanium dioxide;

[0041] Put the extruded molten PET material into a water cooling tank for cooling. After continuous cooling in the cooling tank, the temperature in the cooling tank is controlled at 15 - 50 °C;

[0042] Wind the cooled PET belt onto a stretching mechanism for the first stretching. The rotation speed of the first stretching is 10 - 13 rpm. After the first stretching, the first heat setting is carried out. The heating device is a constant temperature oven, and the temperature is 190 - 260 °C;

[0043] After the first heat setting, the second stretching is carried out. The rotation speed of the second stretching is 13 - 45 rpm. After the second stretching, the second heat setting is carried out, and the temperature is 210 - 230 °C;

[0044] After the second heating, the third stretching is carried out. The rotation speed of the third stretching is 30 - 45 rpm;

[0045] After the third stretching, the semi-finished product is shaped and cut or wound up to obtain the finished product.

[0046] Pack and store in the warehouse.

[0047] The obtained polyester strapping has high tensile strength, good extensibility, and has the characteristics of anti-aging and flame retardancy.

[0048] Finally, it should be noted that those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments. The above embodiments and the description in the specification are only to illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A production process for integrally producing polyester strapping tapes using waste plastics, characterized in that, The waste plastics go through the platform, unpacking, first conveying, rotary screening, first pneumatic conveying, first silo, manual sorting, second conveying, label removal, second pneumatic conveying, second silo, bottle sorting, material sorting, third pneumatic conveying, third silo, pre-washing, crushing, first friction washing, first dehydration, first deep water tank, second dehydration, first label separation, fourth pneumatic conveying, fourth silo, hot washing, third dehydration, second water tank, second friction washing, fourth dehydration, second label separation, eddy current separation, material selection, color sorting, aging sorting, fifth silo, fifth pneumatic conveying, pre-drying, drying, melting and extrusion, first filtration, reaction kettle, first metering and conveying, second filtration, second metering and conveying, stretching, and shaping to obtain polyester strapping tapes. Both the first conveying and the second conveying include strong magnetic iron removal.

2. The production process of integrally producing polyester strapping tapes using waste plastics according to claim 1, characterized in that, The unpacking includes the following steps: unpacking the waste plastic packages conveyed by the platform.

3. The production process of integrally producing polyester strapping tapes from waste plastics according to claim 1, characterized in that, The label removal includes the following steps: removing the label paper, bottle caps, and stone impurities from the conveyed waste plastics in the screening area, leaving only the waste bottle bodies.

4. The production process of integrally producing polyester strapping tapes using waste plastics according to claim 1, characterized in that, The bottle sorting and material sorting include the following steps: removing non-PET bottles such as PVC bottles, aluminum cans, PP bottles, and PE bottles to obtain the final PET bottles.

5. The production process for integrally producing polyester strapping tapes using waste plastics according to claim 1, characterized in that, The crushing process includes the following steps: crushing the pre-washed PET bottle bricks into bottle chips with a size of 10 - 30 mm.

6. The production process of integrally producing polyester strapping tapes using waste plastics according to claim 1, characterized in that, The first friction washing, first dehydration, first deep water tank, second dehydration, first label separation, fourth pneumatic conveying, fourth silo, hot washing, third dehydration, second water tank, second friction washing, fourth dehydration include the following steps: passing the bottle chips through the friction of a friction machine, dehydration by a dehydrator, rinsing in a rinsing tank, dehydration by a dehydrator, and then entering a steam kettle containing caustic soda and cleaning agent; the temperature of the steam kettle is 95 - 100 °C, the ratio of water, caustic soda, and cleaning agent in the steam kettle is 1000:(1 - 10):(1 - 10), the pH value is greater than 7, and the bottle chips coming out of the steam kettle enter a dehydrator for dehydration, rinsing in a rinsing tank, friction by a friction machine, and dehydration by a dehydrator.

7. The production process of integrally producing polyester strapping tapes from waste plastics according to claim 1, characterized in that, The color sorting includes the following steps: the color sorter selects the bottle chips of the unwanted color to obtain the bottle chips of the desired color.

8. A production process for integrally producing polyester strapping tapes using waste plastics according to claim 1, characterized in that, The drying, melting and extrusion, first filtration, reaction kettle, first metering and conveying, second filtration, second metering and conveying, stretching, and shaping include the following steps: placing the bottle chips in a drying tower for drying, the drying tower is set at a temperature of 140 - 180 °C, and the drying time is more than 4 hours; conveying the dried bottle chips to an extruder, the continuous production extrusion speed is 700 - 2000 Kg / h, and antioxidants, flame retardants, elastomers, colorants, and other auxiliary materials are added during the melting and extrusion process; putting the extruded molten PET material into a water cooling tank for cooling, continuously cooling through the cooling tank, and the temperature in the cooling tank is controlled at 15 - 50 °C; The cooled PET belt is wound around the stretching mechanism for the first stretching. The rotation speed of the first stretching is 10 - 13 rpm. After the first stretching, the first heat setting is carried out. The heating device is a constant-temperature oven, and the temperature is 190 - 260 °C; After the first heat setting, the second stretching is carried out. The rotation speed of the second stretching is 13 - 45 rpm. After the second stretching, the second heat setting is carried out, and the temperature is 210 - 230 °C; After the second heating, the third stretching is carried out. The rotation speed of the third stretching is 30 - 45 rpm; After the third stretching, the semi-finished product is shaped and cut or wound up to obtain the finished product.

9. A production device for integrally producing polyester strapping tapes from waste plastics, characterized in that, It includes a platform, an unpacking machine, a first conveyor, a rotary sieve, a first blow molding machine, a second conveyor, a first bin, a first feeding auger, a first material selection platform, a flat bottle paper peeling machine, a double-orifice blow molding machine, a buffer bin, a double auger, a vibrating sieve, a second material selection platform, a second feeding auger, a third material selection platform, a second blow molding machine, a second bin, a third feeding auger, a rotary bottle washer, a fourth feeding auger, a crusher, a horizontal auger, a first elevator, a friction washing machine, a dryer, a three-axis water tank, a second elevator, a dryer, a labeling machine, an auger, a second elevator, a steamer, a dehydrator, a first rinsing tank, a friction wash, a second rinsing tank, a third rinsing tank, a first feeding auger, a dehydrator, a first blower, a label separation device, a second feeding auger, an eddy current separator, a third feeding auger, a material analyzer, a third bin, a second blower, a pre-drying device, a drying device, a melting device, a reaction kettle, an extruder, a stretching and setting device, a packaging machine, which are arranged in sequence according to the production line. The first conveyor and the second conveyor are both provided with magnetic rollers, and the first material selection platform, the second material selection platform and the third material selection platform are all provided with magnetic rollers.

10. The production equipment for integrally producing polyester strapping tapes using waste plastics according to claim 9, characterized in that, The unpacking machine and the rotary sieve are connected by the first conveyor. The first bin and the first blow molding machine are connected by the second conveyor. The first material selection platform and the first bin are connected by the first feeding auger. The vibrating sieve and the buffer bin are connected by the double auger. The third material selection platform and the second material selection platform are connected by the second feeding auger. The rotary bottle washer and the second bin are connected by the third feeding auger. The crusher and the rotary bottle washer are connected by the fourth feeding auger. The first elevator and the crusher are connected by the horizontal auger. The second elevator and the labeling machine are connected by the auger. The dehydrator and the third rinsing tank are connected by the first feeding auger. The eddy current separator and the label separation device are connected by the second feeding auger. The material analyzer and the eddy current separator are connected by the third auger.

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