KR101015383B1 - Recycled polyester chip and manufacturig method therefor and polyester filament fiber manufactured therefrom - Google Patents

Abstract

The present invention relates to a recycled chip for producing a polyester long fiber produced by recycling the polyester bottle waste material, and more specifically, a process for pre-processing the polyester bottle, a primary fractionation process for selecting wind and specific gravity difference, wind power sorting And a second fractionation process for sorting out specific gravity, and a regeneration chip molding process for melt extrusion, and classifying all kinds of foreign substances contained in the polyester bottle waste at low cost and low energy to secure the purity of the polyester granules, Provided are a polyester recycled chip that can be used to produce good quality long fibers by melting and extrusion, a method for producing the same, and a polyester long fiber produced therefrom.

Recycled, Recycled Fiber, Polyester (PET), Recycled Chip, Bottle

Description

Method for manufacturing polyester recycled chip and polyester long fiber manufactured therefrom {RECYCLED POLYESTER CHIP AND MANUFACTURIG METHOD THEREFOR AND POLYESTER FILAMENT FIBER MANUFACTURED THEREFROM}

The present invention relates to a recycled chip for producing a polyester long fiber produced by recycling the polyester bottle waste material, and in detail, all kinds of foreign substances contained in the polyester bottle waste can be fractionated at low cost and low energy. The present invention relates to a polyester recycled chip that can be used to produce a good quality long fiber by securing purity, melting and extrusion molding, a method for producing the same, and a polyester long fiber produced therefrom.

Since the beginning of the 20th century, human beings have introduced mass production methods under the leadership of developed countries to pursue production efficiency, and as the speed of industrialization has increased, the era of mass production and mass consumption has been opened. Environmental problems have arisen due to deteriorating global environment.

Artificial air pollution, water pollution, soil pollution, noise, vibration, and odor caused by production activities in various factories, transportation activities of automobiles, trains, airplanes, ships, and various human activities such as heating, heating, cooking, and leisure activities This damages the natural or living environment and ultimately has a significant impact on human life and health. In particular, gas, such as carbon dioxide, methane, nitrous oxide, and chlorofluorocarbons, surrounds the earth, preventing the radiant heat from being emitted from the strata and causing the greenhouse effect.

In order to cope with this global warming problem internationally, the international community signed a climate change agreement in Rio de Janeiro, Brazil, in June 1992. In 1998, the Kyoto Protocol established a clean development system and a greenhouse gas emission trading system. Principle-based reductions in greenhouse gas emissions and the country's binding targets have been calculated, which has led to the importance of recycling waste.

Among the synthetic resins, polyester is excellent in chemical stability, so it is mass-produced and used in food fields such as living materials such as fibers and films, beverages and carbonated beverage bottles. However, the disposal of waste and out-of-standard products of fiber, film and bottle products, which are generated in large quantities with the increase of production and usage, is a big social problem, and various methods for recycling methods such as chemical recycling, material recycling, and thermal recycling Proposals are being made.

In particular, the problem of handling a polyester bottle bulky compared to the weight of the polyester waste is more serious situation. Currently, the recycling method of polyester bottles is material recycling, which is performed only by recycling the recycled polyester bottles to short fibers (staple yarns). Due to deterioration of processability and physical properties, color discoloration and dyeing non-uniformity, it is impossible to use for polyester filament (filament yarn).

In addition, discarded polyester bottles generally contain labels and caps of different plastic materials, such as polypropylene, polyethylene, polyvinyl chloride, etc., derived from components of polyester bottle products, various adhesives, pigments, dyes, and the like.

Such a waste polyester bottle can be subdivided as follows by a recycling method.

Chemical recycling is the chemical decomposition of waste polyester bottles to be used as chemical raw materials. It is semi-permanent and can be recycled optimally in a cyclical economic society, but it is difficult in terms of technology and cost.

Material recycling is the melting and regeneration of homogeneous or dissimilar materials, and is the best method in terms of cost, but there is a practical problem that thorough classification is required.

Thermal recycling is not recommended as a recycling method because it is reused as thermal energy, and resources cannot be used repeatedly, and it burns and generates carbon dioxide.

Specifically, examples of the chemical recycling include a method for obtaining terephthalic acid by hydrolyzing a polyester waste in the presence of an alkali compound described in Japanese Patent Application Laid-open No. Hei 11-21374, US Patent No. 5952520 and Japanese Patent Laid-Open No. 2000- A method of obtaining dimethyl terephthalate and ethylene glycol by gas phase methyl alcohol decomposition described in the specification of 169623, and the like are disclosed.

The chemical recycling method is the most advantageous method in terms of purity of the raw material, but requires an expensive device and a complicated process, there is a problem that the energy consumption is relatively high because it is repolymerized after recovering the monomer. In addition, since the reaction conditions at a high temperature of 200 ° C. or higher are actually necessary, decomposition starts from 190 ° C. like polyvinyl chloride, and the phase from which the degradation product causes deterioration of the final product is very sensitive to the incorporation of polyester plastics. there is a problem. Therefore, in chemical recycling, it is necessary to remove impurities almost completely in the pretreatment process similarly to material recycling.

Accordingly, an object of the present invention is to fractionate all kinds of foreign matters contained in polyester bottle waste at low cost and low energy to ensure the purity of polyester granules, which can be used to produce good quality fibers by melting and extrusion molding. The present invention provides a polyester recycled chip, a method of manufacturing the same, and a polyester long fiber manufactured therefrom.

In order to achieve the above object, the present invention comprises the steps of: 1) unpacking the fractional collection, recovered polyester bottle bale (Bale); Removing metal material by the metal detector from the decomposed polyester bottle; And forming a polyester bottle body by removing labels and caps of different materials other than polyester from the polyester bottle from which the metal material is removed. 2) Wet grinding and drying the polyester bottle body. To form a polyester flake of 3 to 30 mm in length; Primarily removing residues of the label from the polyester flakes by wind power of 5-10 m / sec; And washing the foreign material and the content residue of the polyester flakes from which the residue is removed with water, removing foreign matters having a specific gravity greater than water, and separating the different material plastics having a specific gravity smaller than water by primary gravity. Primary fractionation process, 3) wet grinding and drying the polyester flakes from which the different plastics are first separated to form a polyester granule having a length of 0.5 to 3 mm; Secondly removing residual foreign matter by the wind power of 2 to 5 m / sec from the polyester granule; And washing the foreign material and the contents residue of the polyester granules from which the residual foreign material has been removed with water, removing foreign matters having a specific gravity greater than water, and separating the different material plastics having a smaller specific gravity than water by selecting a specific gravity difference. Second fractionation process consisting of: 4) melting the polyester granules in which the dissimilar material plastics are secondarily separated, and side feed the master batch chip containing titanium dioxide (TiO ₂ ) as a quencher, and the titanium dioxide content is 0.005 to 3 Forming a polyester melt of%; Extruding and cooling and solidifying the polyester melt to form a polyester recycled resin; And a regenerated chip forming process comprising cutting the polyester regenerated resin into pellets.

In addition, the present invention provides a polyester recycled chip produced by the method for producing a polyester recycled chip.

In addition, the present invention provides a regenerated polyester filament formed by using a polyester regenerated chip produced by the method for producing a polyester regenerated chip alone, or by mixing and melt spinning with a new polyester chip for fiber production. .

The polyester regenerated chip manufactured according to the present invention is a low cost and low energy fractionating all kinds of foreign substances contained in the polyester bottle waste as a raw material to ensure the purity of the polyester granules, and by melting and extrusion molding, It can be used to produce polyester long fibers, which has the effect of reducing environmental pollution.

The method for manufacturing a polyester regenerated chip according to the present invention includes a process for preprocessing a polyester bottle, a first fractionation process for wind sorting and specific gravity sorting of the pretreated polyester flakes, and a windscreen sorting of the first fractionated polyester granules. And a second fractionation process for selecting specific gravity difference, and a process for melting and extruding the secondary fractionated polyester granules to form a polyester regenerated chip, and at a material recycling for melt spinning the polyester regenerated chip. As a result, it is characterized by constituting the recycled polyester filament.

With reference to the drawings and embodiments will be described in detail a method for producing a polyester recycling chip of the present invention.

Figure 1 schematically shows a process of manufacturing a polyester recycled chip of the present invention.

Referring to FIG. 1, first, a method of manufacturing a polyester regenerated chip of the present invention comprises the steps of: unpacking the collected and recovered polyester bottle bales (Bale), the metal by the metal detector from the decomposed polyester bottle And a pretreatment step of removing the material and forming a polyester bottle body by removing a label and a cap of a different material other than polyester from the polyester bottle from which the metal material is removed.

The material recycling method of the polyester bottle is an eco-friendly method with relatively low energy consumption because of the relatively simple device and no recovery and repolymerization process up to the monomer stage, compared to the chemical method, but thorough separation and dissimilarity at the raw material stage It is very difficult to construct a polyester regenerated chip without thorough fractionation of polymers, and it is almost impossible to use the regenerated polyester regenerated chip for long fibers. In addition, it is necessary to reliably remove labels and caps made of different plastic materials such as polypropylene, polyethylene, and polyvinyl chloride derived from components of polyester bottle products, so that polyester recycled chips that can be used for the manufacture of polyester long fibers can be constructed. have.

To this end, in the present invention, the polyester bottle bales are collected and recovered and fractionated to disperse the polyester bottle.

Among various foreign substances included in the polyester bottle dismantled from the polyester bottle bale, metal components such as iron and aluminum serve as the biggest obstacles to construct the polyester regeneration chip. Therefore, a common metal detector is used to find and remove metal components such as iron and aluminum contained in the polyester bottle. The label and cap made of polypropylene, polyethylene, and polyvinyl chloride are separated and removed from the polyester bottle from which the metal component is removed as described above by hand or a known technique.

As described above, the polyester bottle body of which the label and the cap of the dissimilar material material are separated and pulverized is pulverized to form a polyester flake having a predetermined size, and the first fractionation removes various foreign substances.

In addition, the method for producing a polyester regenerated chip of the present invention comprises the steps of wet grinding and drying the polyester bottle body to form a polyester flake of 3 to 30 mm in length, 5 to 10 m / sec from the polyester flake Firstly removing residues of the label by wind power, and washing foreign substances and contents residues of the polyester flakes from which the residues have been removed with water, removing foreign substances having a higher specific gravity than water, and sorting by specific gravity It includes a primary fractionation process consisting of the first step of separating the different specific gravity plastics.

The polyester bottle pretreated as described above is wet pulverized and dried to form a polyester flake having a length of 3 to 30 mm, and the first fractionation is performed on the polyester flake.

If the length of the polyester flakes to be subjected to the primary fractionation is less than 3 mm, the foreign matters that are to be removed and removed as well as the polyester flakes, which are the active ingredients, are blown away by the wind together to remove the foreign matter, and the length of the polyester flakes is 30 mm. If exceeded, the removal of foreign matters is prevented due to the weight of the polyester flakes in the first fractionation process.

From the polyester flakes, different materials and foreign substances including label residues such as polyethylene, polypropylene, polyvinyl chloride, and the like, which are different from polyesters used in the labels of polyester bottles and the like, are firstly removed by wind.

That is, airflow of 5-10 m / sec wind speed is applied to the polyester flakes to blow off the label residues contained in the polyester flakes to remove them first. If the airflow applied to the polyester flakes to remove the label residues is less than 5 m / sec, the label residues contained in the polyester flakes may not be properly screened out due to the lack of wind power. If the wind speed exceeds 10 m / sec, the excess wind blows away not only the label residues but also the active polyester flakes. The wind power on the polyester flakes must be properly adjusted. Such wind screening can remove 99% or more of label residues of polyethylene, polypropylene, and polyvinyl chloride, which are different materials.

Subsequently, the polyester flakes are washed with water and fed into a specific gravity separator to remove the cap pulverized product containing polyethylene or polypropylene, which cannot be removed in wind sorting. The cap mill is separated off by specific gravity screening and the remaining polyester flakes are recovered and dried to obtain the first fractionally washed polyester flakes.

Conventional polyester bottle regeneration method is subjected to the first fractional cleaning and pelletized immediately, and then regenerated into chips of several hundred ppm of different materials and foreign matter, which is not suitable for preparing general polyester moldings or short fibers. Although it is an appropriate level of purity, it is still insufficient in terms of purity to produce polyester long fibers. Due to the characteristics of long fibers, fairness in the continuous process should be ensured, and in terms of its quality, post-processing properties, especially dyeing properties, should be secured. Hundreds of ppm of dissimilar materials and foreign substances contained in the primary rinsed polyester flakes are important It acts as a drawback and significantly lowers fairness and stainability.

Therefore, in order to make the first fractionally washed polyester flakes long fibers, a secondary fractionation process for further improving the purity of the polyester flakes is essential.

In addition, the method for producing a polyester regenerated chip of the present invention comprises the steps of wet grinding and drying the polyester flakes from which the different material plastics are first separated to form a polyester granule having a length of 0.5 to 3 mm, from the polyester granules. Secondly removing residual foreign matters by wind of 2 to 5 m / sec, and cleaning foreign matters and contents residues of the polyester granules from which the residual foreign matters have been removed by water and removing foreign substances having a higher specific gravity than water, The second fractionation process includes a step of separating the different material plastics having a specific gravity smaller than that of water by selecting the specific gravity difference.

The primary fractionation washed polyester flakes are wet pulverized and dried to form a polyester granule having a length of 0.5 to 3 mm, and the secondary fractionation is performed on the polyester granules.

If the length of the polyester granules subjected to the second fractionation is less than 0.5 mm, the foreign particles that are to be removed and removed as well as the polyester granules, which are the active ingredients, are removed by the wind together with the second fractionation, and the length of the polyester granules is 3 mm. If exceeded, the second fractionation process would interfere with the removal of foreign matter due to the weight of the polyester flakes.

From the polyester flakes, different materials and foreign substances including fine label residues, such as polyethylene, polypropylene, and polyvinyl chloride, which are different from polyesters used in labels of polyester bottles and the like, are first sorted out by wind.

That is, by applying airflow at a wind speed of 2 to 5 m / sec to the polyester granules, the fine label residue contained in the polyester granules is blown to remove the secondary. If the air velocity applied to the polyester granules to remove the fine label residues is less than 2 m / sec, the fine label residues contained in the polyester granules are not properly screened out due to the lack of wind power, and the polyester granules If the wind speed of the air flow exceeds 5 m / sec, the wind power is blown away to remove not only the fine label residue but also the active ingredient polyester granules, and thus to remove the dissimilar materials and foreign substances including the fine label residue. The wind power on the polyester granules in the second removal must be more precisely and appropriately controlled than in the first fractionation process. By such wind sorting, the content of label residues of polyethylene, polypropylene, and polyvinyl chloride, which are different materials contained in the polyester granules, can be reduced to 0.001 to 0.002 wt%.

Subsequently, in order to remove the fine cap pulverized product mainly composed of polyethylene or polypropylene, which cannot be removed in wind sorting, the polyester granules are washed with water, and put into a specific gravity sorter, and the polyethylene and polypropylene materials having a smaller specific gravity than water are used. The fine cap mill of is separated off by gravity screening and the remaining polyester granules are recovered and dried to obtain a secondary fractionally washed polyester granule.

As described above, the secondary fractionally washed polyester granules have a content of different materials and foreign matters of 0.003% by weight or less, and have a purity sufficient to form polyester long fibers by melt spinning. The polyester granules are melted and molded into pellets to form a polyester recycling chip.

In addition, the method of manufacturing a polyester recycled chip of the present invention melts the polyester granules from which the dissimilar material plastics are secondarily separated, and side feeds the master batch chip containing titanium dioxide as a quencher, so that the titanium dioxide content is 0.005 to 3 weight. Forming a polyester melt, the polyester melt by extruding and cooling and solidifying the polyester melt to form a polyester recycled resin, and cutting the polyester recycled resin into pellets. do.

As described above, the second fractionally washed polyester granule is dried to a level of 0.003% or less using a dehumidifying dryer.

The dried polyester granules are injected into an extruder equipped with a side feeder, melted and extruded, and mixed with the polyester granules by adding titanium dioxide, which is a light-dispersing quencher, into the side feeder in the form of a master batch chip. To form a polyester melt having a titanium dioxide content of 0.005 to 3% by weight. If the content of titanium dioxide contained in the polyester melt is less than 0.005% by weight in order to form a polyester recycled chip, the matting function of the polyester recycled chip formed from the polyester melt is reduced, and the amount of titanium dioxide contained in the polyester melt is reduced. If the content exceeds 3% by weight, the effect on the input amount is lowered due to the decrease of fairness due to excessive titanium dioxide, guide wear and manufacturing cost increase.

And, the master batch chip is mixed with the polyester granules to form a polyester melt is formed by mixing and dispersing the new polyester chip and titanium dioxide by a conventional method, the titanium dioxide content in the master batch chip is 20 to 50 Configured to be%. If the titanium dioxide content of the master batch chip mixed with the polyester granules is less than 20% by weight, the matting function of the polyester long fibers produced from the recycled polyester chip is reduced, and the titanium dioxide content of the master batch chip mixed with the polyester granules is reduced. When the amount exceeds 50% by weight, it is difficult to secure dispersibility of titanium dioxide in the polyester regenerated chip formed from the polyester melt, which causes deterioration of processability and dyeing property in the production of long fibers.

By feeding the titanium dioxide-containing master batch chip to the polyester granule as described above, melting and extruding, cooling in a cooling tank to form a recycled resin, and cutting the recycled resin into pellets by a cutter. A polyester recycled chip that can be molded into long fibers is produced.

The polyester recycled chip produced by the method for producing a polyester recycled chip may be used alone or mixed with a novel polyester chip for fiber production, and melt-spun by a known technique to form polyester long fibers. In this case, the polyester filament formed at this time preferably includes 50 to 100% by weight of polyester regenerated chip.

Although it is technically possible to construct recycled polyester long fibers having a polyester recycled chip component of less than 50% by weight (i.e., more than 50% by weight of the new polyester chip for fiber manufacturing), This means that polyester recycled chips formed by material recycling of polyester bottle waste are lost.

The present invention will be described in more detail with reference to specific examples as follows. Embodiments according to the present invention can be modified in various forms, the scope of the present invention should not be construed as limited to the embodiments described below.

≪ Example 1 >

1. Fractionation The polyester bottle bales were dissociated to disperse the polyester bottle.

2, the metal material was removed from the polyester bottle using a metal detector.

3. The pre-treatment was completed by manually removing different materials such as labels and caps from the polyester bottle from which the metal material was removed.

4. The pretreated polyester bottle was ground with a wet mill to form polyester flakes with an average length of 10 mm.

5. From the polyester flakes, different materials such as labels and caps and foreign substances were separated and removed by 7 m / s of wind power applied in a wind separator.

6. The polyester flakes from which the different materials and foreign matters are separated and removed are washed with industrial water, and the specific gravity material is separated using a specific gravity separator to separate the different materials and foreign matters having a smaller specific gravity, and washed and dried to separate the primary materials. Completed.

7. The first fractionated polyester flakes were ground with a wet mill to form polyester granules with an average length of 1 mm.

8. The remaining foreign materials and foreign matters were separated from the polyester granules by 3 m / s of wind power applied at the wind separator.

9. The polyester granules from which the different materials and foreign matters have been separated and removed are washed with industrial water, and the specific gravity materials and foreign matters having a specific gravity smaller than water are separated by performing specific gravity separation with a specific gravity fractionator, and the second classification is performed by washing and drying. Completed.

10. Melt the secondary fractionated polyester granules at 295 ° C. in an extruder, and supply a master batch chip containing 20 wt% of titanium dioxide as a quencher to the extruder side feeder, thereby obtaining 98.5 weight of polyester granules. A polyester melt was formed such that the titanium dioxide content was 0.03 wt% in a mixture of% and 1.5 wt% of the master batch chip.

11. The polyester melt was extruded and cooled to solid to form a polyester recycled resin.

12. The polyester recycled resin was cut into pellets to form a polyester recycled chip.

13. The polyester regenerated chip was spun at a rate of 3,000 m / min at 295 ° C. in a long fiber spinning device to form regenerated polyester semi-drawn yarn.

14. The regenerated polyester semi-stretched yarn was twisted at a draw ratio of 1.7 using a twisting device to prepare regenerated polyester twisted yarn of 75 denier / 72 filaments.

≪ Example 2 >

The secondary fractionated polyester granules were melted in an extruder at 295 ° C., and a master batch chip containing 40 wt% of titanium dioxide, a quencher, was fed to the extruder's side feeder. Forming a polyester melt such that the titanium dioxide content is 0.2% by weight in a mixture of 5% by weight of the batch chip, and spinning the polyester regenerated chip at a rate of 4,500 m / min at 290 ° C. in a long fiber spinning device It is the same as that of Example 1 except having produced the regenerated polyester stretched yarn of denier / 36 filament.

<Comparative Example 1>

1. Fractionation The polyester bottle bales were dissociated to disperse the polyester bottle.

2, the metal material was removed from the polyester bottle using a metal detector.

3. The pre-treatment was completed by manually removing different materials such as labels and caps from the polyester bottle from which the metal material was removed.

4. The pretreated polyester bottle was ground with a wet mill to form polyester flakes with an average length of 10 mm.

5. From the polyester flakes, different materials such as labels and caps and foreign substances were separated and removed by 7 m / s of wind power applied in a wind separator.

6. The polyester flakes from which the different materials and foreign matters were separated and removed were washed with industrial water, and the specific gravity material was separated with a specific gravity fractionator to separate the different materials and foreign materials having a specific gravity smaller than water, and washed and dried to complete the fractionation. .

7. The fractionated polyester granules were melted at an extruder at 295 ° C., and a master batch chip containing 40 wt% of titanium dioxide as a quencher was supplied to the extruder's side feeder to obtain 95 wt% of polyester granules. A polyester melt was formed such that the titanium dioxide content was 0.2% by weight in a mixture of 5% by weight of masterbatch chips.

8. The polyester melt was extruded and cooled and solidified to form a polyester recycled resin.

9. The polyester recycled resin was cut into pellets to form a polyester recycled chip.

10. The polyester regenerated chip was spun at a rate of 3,000 m / min at 295 ° C. in a long fiber spinning device to form regenerated polyester semi-drawn yarn.

11. The regenerated polyester semi-stretched yarn was twisted at a draw ratio of 1.7 using a flammable apparatus to prepare regenerated polyester twisted yarn of 75 denier / 72 filaments.

<Comparative Example 2>

The polyester regenerated chip was spun at a rate of 4,500 m / min at 290 ° C. in a long fiber spinning apparatus, and the same procedure as in Comparative Example 1 was carried out except that the regenerated polyester stretched yarn of 75 denier / 36 filaments was prepared.

Evaluation of physical properties and processability of the polyester regenerated chip and regenerated polyester filament manufactured according to the above-described examples and comparative examples was carried out in the following manner, and the results are shown in Table 1 below.

1. Color L, b value of polyester regenerated chip: Color L value and color b value of regenerated chip were measured by KS A 0067 color standard using Colorerview of Gardener.

2. Elongation of recycled polyester filament: The elongation of regenerated polyester filament was measured by using Instron 5565 of Instron.

3. Spinning operation: The end of the full tube was measured for 4 hours by operating the 4-end spinning machine for 48 hours.

4. Combustible operability: The 12-bit combustor was operated for 48 hours, and the ratio of full capacity to total output was measured using a 3 kg volume basis.

5. Dyeability: 100 fabrics were prepared by dyeing the fabrics with sock paper, and visually evaluated and there was no dyeing difference at all. ◎, if there was at least one dyeing difference in the sample, X was indicated. The proportion of good samples without staining in the whole circular knitted fabric was measured by the M ratio (%).

<Table 1> Comparison of properties and processability of polyester recycled chip and recycled polyester filament

division Example 1 Example 2 Comparative Example 1 Comparative Example 2 Polyester Recycled Chip
Viscosity 0.641 0.630 0.615 0.603 Color L value 80.1 82.0 69.5 72.5 Color b value 6.0 3.5 10.2 8.0 Recycled Polyester Long Fiber







Spinning temperature (℃) 290 295 290 295 Spinning speed (m / min) 3.000 4,500 3,000 4,500 Combustible DR 1.7 - 1.7 - Combustion Speed (m / min) 500 - 500 - Den / Fila 75/72 75/36 75/72 75/36 Strength (g / D) 4.7 4.5 4.3 4.0 Shinto (%) 25 40 23 37 Emission Operationality (%) 97 06 63 55 Flammability (%) 98 - 65 - Dyeability (M rate,%) 98 97 75 74

In Table 1, the polyester regenerated chip and the regenerated polyester filament of the Example were much superior to the physical properties, processability and dyeing properties of the polyester regenerated chip and the regenerated polyester filament of the comparative example.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by those skilled in the art without departing from the gist of the present invention as claimed in the claims. Of course, such changes will fall within the scope of the claims.

1 is a process chart of the manufacturing method of the polyester recycling chip of the present invention

Claims (5)

A pretreatment step of forming a polyester bottle body by removing a metallic bottle by unpacking a polyester bottle bale and removing a label and a cap of a different material other than polyester; The residue of the label is first removed by applying wind power of 5 to 10 m / sec to the polyester flakes having a length of 3 to 30 mm formed by pulverizing the pre-treated polyester bottle body, and specific gravity is selected by water. A primary fractionation process of primaryly separating the small dissimilar plastics; The primary fractionated polyester flakes were formed by pulverizing a polyester granule having a length of 0.5 to 3 mm and subjected to wind power of 2 to 5 m / sec to remove residual foreign matters secondly, and to perform specific gravity differentiation with water so that specific gravity is higher than water. Secondary fractionation process for secondary separation of small dissimilar plastics; And Melting the secondary fractionated polyester granules and mixing the masterbatch chip containing titanium dioxide (TiO ₂ ), so that the titanium dioxide content in the mixture of the polyester granules and the masterbatch chip is 0.005 to 3% by weight of polyester A method for producing a polyester regenerated chip comprising a regenerated chip forming step of forming a melt, extruding, cooling and solidifying and cutting into pellets. The method of claim 1, wherein the content of titanium dioxide in the master batch chip mixed in the recycle chip forming step is 30 to 50% by weight. A polyester recycling chip manufactured by the method for producing a polyester recycling chip of claim 1. A regenerated polyester filament composed of a polyester regenerated chip produced by the method for producing a polyester regenerated chip according to claim 1 alone, or mixed with a new polyester chip for fiber production and melt spinning. The regenerated polyester filament according to claim 4, wherein the regenerated polyester filament is composed of 50 to 100% by weight of a polyester regenerated chip component.

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