CN114571691A - Production method of PET plastic packing belt - Google Patents

Production method of PET plastic packing belt Download PDF

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Publication number
CN114571691A
CN114571691A CN202210275553.2A CN202210275553A CN114571691A CN 114571691 A CN114571691 A CN 114571691A CN 202210275553 A CN202210275553 A CN 202210275553A CN 114571691 A CN114571691 A CN 114571691A
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CN
China
Prior art keywords
pet
production method
packing belt
film
pet plastic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210275553.2A
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Chinese (zh)
Inventor
谢志江
朱启强
罗荣业
苏绍昌
林茂良
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Baozhuang Technology Co ltd
Original Assignee
Guangdong Baozhuang Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangdong Baozhuang Technology Co ltd filed Critical Guangdong Baozhuang Technology Co ltd
Priority to CN202210275553.2A priority Critical patent/CN114571691A/en
Publication of CN114571691A publication Critical patent/CN114571691A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B13/00—Conditioning or physical treatment of the material to be shaped
    • B29B13/06—Conditioning or physical treatment of the material to be shaped by drying
    • B29B13/065—Conditioning or physical treatment of the material to be shaped by drying of powder or pellets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/04—Disintegrating plastics, e.g. by milling
    • B29B17/0412—Disintegrating plastics, e.g. by milling to large particles, e.g. beads, granules, flakes, slices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2029/00—Belts or bands
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

Abstract

The invention discloses a production method of a PET plastic packing belt, and belongs to the technical field of packing belt processing. The production method of the PET plastic packing belt comprises the following steps: the waste printing film is taken as a raw material, and the raw material is treated by the following steps: crushing, sorting, drying, extruding, tackifying and stretching and forming. The method can be used for producing the qualified PET plastic packing belt, realizes the recycling of the printed waste film, solves the problem of environmental pollution caused by directly discarding the film, and has the advantages that the film is difficult to degrade and various components cause environmental pollution; the waste and old film recycling packaging belt is used for directly solving the problem of waste and old film recycling, and the economic benefit is increased by production and packaging.

Description

Production method of PET plastic packing belt
Technical Field
The invention relates to the technical field of packaging belt processing, in particular to a production method of a PET plastic packaging belt.
Background
PET (polyethylene terephthalate) is a linear thermoplastic resin and is one of the most widely used engineering plastics. The density of the product is (1.3-1.4) g/cm3The Intrinsic Viscosity (IV) is 0.62-1.20 ml/g, and the melting point is 245-. The PET plastic is transparent, has high glossiness, and has better weather resistance, chemical stability, impact resistance, creep resistance and dimensional stability; it has high heat resistance, can maintain excellent physical and mechanical performance in wide temperature range, and is high value resin. The PET packing belt is a polyester packing belt formed by extruding PET as a main raw material and performing unidirectional stretching, is the most popular novel environment-friendly packing material for replacing steel belts, steel wires and heavy PP packing belts internationally at present, and has the advantages that: (1) the steel belt has strong tensile resistance, is as good as steel belt, has impact-resistant ductility, and can ensure the transportation safety of products; (2) the elongation is small, the elongation is only one sixth of that of the polypropylene belt, and the tension can be kept for a long time; (3) the safety is good, the defect that the bundled objects are polluted by rusting of the steel belt is avoided, and the color is bright and can be identified; (4) the economic benefit is good, the length of 1 ton of PET packing belt is equivalent to the length of 6 ton of steel belt with the same specification, the single price per meter is lower than that of the steel belt by more than 40 percent, and the packing cost can be greatly reduced.
At present, a PET packing belt is generally prepared by using a PET material and an auxiliary agent as processing raw materials, and no report of preparation by using a waste printing film as a raw material exists.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a method for producing a PET plastic packing belt.
The technical problem to be solved by the invention is realized by adopting the following technical scheme.
The invention provides a production method of a PET plastic packing belt, which comprises the following steps: the waste printing film is taken as a raw material, and the raw material is treated by the following steps: crushing, sorting, drying, extruding, tackifying and stretching and forming.
The invention also provides a PET plastic packing belt obtained by the production method.
The invention has the following beneficial effects:
the invention provides a production method of a PET plastic packing belt. The production method of the PET plastic packing belt comprises the following steps: the waste printing film is used as a raw material, and the raw material is treated by the following steps: crushing, sorting, drying, extruding, tackifying and stretching and forming. The production method takes waste printing films as raw materials, qualified broken PET pieces can be obtained by adopting a crushing and sorting process in the early stage, then the broken PET pieces are dried, partial impurities of the broken PET pieces can be gasified and discharged, melting and extrusion are carried out to ensure constant-pressure feeding of a screw, non-PET materials in the raw materials can be extracted by high-temperature tackifying treatment to further purify the raw materials, then the qualified PET plastic packing belt can be obtained by adopting a conventional extrusion and stretching process, the PET plastic packing belt produced in large batches by using the waste printing films can be realized by adopting the above technology, and the comprehensive popularization and application can be expected.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The printed film and the composite printing structure based on the printed film are widely applied to the fields of touch screens, structural members of photoelectric products, labels or packages with special optical effects, high-resolution circuit boards, organic thin-film solar devices OPV, organic light-emitting diodes OLED, electrochromic films, fingerprint identification devices and the like. Based on the wide application of printing films, a large amount of waste printing films are generated every year, and how to effectively treat the waste printing films is also a problem to be solved at present. The inventor provides a method for producing PET plastic packing belts by using waste printing films through long-term practice, and the method not only can effectively utilize the waste printing films, but also can produce the PET packing belts meeting normal use, thereby achieving the dual purposes of recycling wastes and improving economic value.
The following describes a method for producing a PET plastic strapping band according to an embodiment of the present invention.
The embodiment of the invention provides a production method of a PET plastic packing belt, which comprises the following steps: the waste printing film is taken as a raw material, and the raw material is treated by the following steps: crushing, sorting, drying, extruding, tackifying and stretching and forming.
At present, the production method of the PET plastic packing belt is generally as follows: stirring and dispersing PET raw materials in a high-speed stirrer at a high speed, and dehumidifying and drying in a dryer; adding various auxiliary agents; mixing and plasticizing in a screw extruder, and then stretching and forming. The PET plastic packing belt provided by the embodiment of the invention takes the waste printing film as a raw material, on one hand, the waste printing film is complex in composition and not only contains PET, but also contains PP, PVC, PET, PE and the like, the waste recycling is difficult to distinguish by naked eyes, the waste recycling is easy to cause mixing and recycling, if the waste materials are directly mixed, the qualified PET plastic packing belt cannot be produced, on the other hand, the surface of the waste printing film contains impurities such as silicone oil, paint coating, titanium dioxide, glue and the like, if the packing belt is directly produced, the melt viscosity is low, the molecular chain decomposition of the PET melt and other characteristics are generated, and the produced packing belt has the quality problems of brittleness, insufficient strength and the like.
The inventor practices the long time to produce the qualified PET plastic packing belt by using the waste printing film, and proposes the following production process: crushing, sorting, drying, extruding, tackifying and stretching and forming. Qualified PET broken pieces can be obtained by adopting a crushing and sorting process in the early stage, then the PET broken pieces are dried, partial impurities of the PET broken pieces can be gasified and discharged, then melting and extrusion are carried out to ensure constant-pressure feeding of a screw, non-PET materials in the raw materials can be extracted by high-temperature tackifying treatment to further purify the raw materials, then a qualified PET plastic packing belt can be obtained by adopting a conventional extrusion and stretching process, and the PET plastic packing belt can be produced by using waste printing films in a large batch through the technology.
In an alternative embodiment, the raw material is sent to a film crusher to be crushed to obtain crushed sheet materials;
preferably, the bulk density of the flakes is 0.5-0.8Kg/m3。
The waste printing film is produced by classifying the raw materials of the packing belts according to physical properties, wherein the raw materials comprise granules, slices, bottle slices, waste recycling packing belts, foam materials and crushed films, the bulk density of the granules, the slices, the bottle slices, the waste recycling packing belts and the foam materials is larger, and the bulk density of the crushed films is only one third or less than the bulk density of the materials, so that the production yield is small. Therefore, in order to realize large-scale mass production, the production method provided by the embodiment of the invention firstly selects the crusher to effectively crush the waste printing film, can produce the crushed film with relatively high bulk density by adjusting the cutter and selecting the type of the screen of the crusher, can improve about 30 percent on the basis of directly purchasing the bulk density of the crushed film on the market, and can ensure that the single-machine yield reaches 2-4t/h and the bulk density reaches 0.5-0.8Kg/m3。
In an optional embodiment, the scrap materials are sent to a material sorting machine for sorting to obtain PET scrap materials;
preferably, the purity of the PET flakes is more than or equal to 95%.
The plastic film is used for producing the packing belt made of the PET material, and the PET film is a packing film with comprehensive performance. A large number of films on the market have respective components, including PP, PVC, PET, PE and the like, and waste recycling is difficult to distinguish by naked eyes and is easy to cause mixing and recycling; however, in the case of PET strapping bands, PVC is the deadly weak point of PET leading to molecular chain cleavage; other materials have different melting points, and therefore, carbonization or infusibility is caused in the production process. Therefore, the broken film fragment raw materials need to be sorted by a material sorting machine to separate out film raw materials with different materials, and the broken PET film sheet materials with the purity of 95 percent and the single machine yield of 2-4t/h are obtained.
In an optional embodiment, the PET scrap material is sent into a vacuum dryer for drying treatment to obtain a wet-removed material;
preferably, the drying temperature of the vacuum drying is 100-160 ℃, the vacuum degree is 100-250Pa, and the nitrogen amount is 0.1-0.2 MPa.
Because the surface of the waste printing waste film contains impurities such as silicone oil, plating paint, titanium dioxide and glue, the characteristics of low melt viscosity, PET melt molecular chain decomposition and the like can be generated if the packing belt is directly produced, and the produced packing belt has the quality problems of brittleness, insufficient strength and the like. Therefore, the sorted broken PET film sheets are subjected to vacuum drying treatment, and the gasified impurity film with low melting point, partial silicon oil, paint coating, glue and the like can be pumped away during drying, so that the PET film production material is further purified.
In an optional embodiment, the dehumidified material is fed into a forced feeding machine for forced feeding, and then is fed into a screw extruder for melt extrusion to obtain an extruded material;
preferably, the speed of the forced feeder is 10-32 rpm.
Preferably, the extrusion process parameters are: the current is 150-270A, the temperature is 250-280 ℃, and the rotating speed is 10-32 rpm.
And feeding the dehumidified material into a forced feeding machine for forced feeding, and then feeding the dehumidified material into a screw extruder for extrusion processing to obtain an extruded material. Because the density of the broken PET film sheet is relatively low, the broken PET film sheet cannot be directly fed into the screw extruder, a forced feeding machine needs to be added at the front end of the screw extruder, and the forced feeding machine which is independently researched, developed and improved is adopted for feeding, so that constant-pressure feeding of the screw can be ensured, and high-yield extrusion of the screw is met.
In an optional embodiment, the extruded material is sent into a vacuum reaction kettle for tackifying treatment to obtain a melt material;
preferably, the vacuum degree of the vacuum reaction kettle is 1-30Pa, and the viscosity of the melt material obtained by tackifying treatment is 0.7ml/g-0.8 ml/g.
And (3) tackifying and purifying the PET film material at the melt end by adopting a vacuum reaction kettle technology, so that the melt in the PET film material is subjected to liquid phase chemical reaction, extracting the non-PET material again at high temperature, recombining molecular chains and further increasing the molecular chains, further purifying the molecules of the PET film material, improving the viscosity of the melt, and meeting the normal index of a film melt production process.
In an optional embodiment, the melt material is sent into a stretch forming machine for stretch forming treatment to obtain a PET plastic packing belt;
preferably, the linear speed of stretch forming is 120-150 m/min.
The PET plastic packing belt is obtained by carrying out stretch forming treatment on the melt material obtained through vacuum reaction, the yield is 5t/h, the production of the packing belt by using the printing waste film in large batch is realized through the above technology, and the comprehensive popularization and application can be expected.
In a second aspect, the embodiment of the invention also provides a PET plastic packing belt produced according to the production method.
In an optional embodiment, the width is 10-32mm, the thickness is 0.5-1.5mm, the tensile strength is 25-50MPa, the elongation at break is less than or equal to 25%, and the number of brittle points is 0.
The features and properties of the present invention are described in further detail below with reference to examples.
The embodiment of the invention provides a production method of a PET plastic packing belt, which comprises the following production process flows: waste films → crushing into pieces → material sorting (PET film pieces) → vacuum drying → forced feeding → high-yield extrusion screw → vacuum reaction kettle technique → extrusion stretch forming. Specifically, the method comprises the following steps:
feeding the raw material into a film crusher to crush to obtain crushed pieces, wherein the bulk density of the obtained crushed pieces is 0.5-0.8Kg/m3。
And (3) feeding the scrap materials into a material sorting machine for sorting to obtain PET scrap materials, wherein the purity of the PET scrap materials is more than or equal to 95%.
And (3) conveying the PET fragment material into a vacuum drier for drying treatment to obtain a dehumidified material, wherein the drying temperature of the vacuum drying is 100-160 ℃, the vacuum degree is 100-250Pa, and the nitrogen content is 0.1-0.2 MPa.
After the dehumidified material is fed into a forced feeding machine for forced feeding, the dehumidified material is fed into a screw extruder for extrusion processing to obtain an extruded material, the rotating speed of the forced feeding machine is 10-32rpm, and the extrusion process parameters are as follows: the current is 150-270A, the temperature is 250-280 ℃, and the rotating speed is 10-32 rpm.
And (3) feeding the extruded material into a vacuum reaction kettle for vacuum reaction to obtain a melt material, wherein the vacuum degree of the vacuum reaction kettle is 1-30Pa, and viscosity of the melt material obtained by tackifying treatment is 0.7ml/g-0.8 ml/g.
And feeding the melt material into a stretch forming machine for stretch forming treatment to obtain a PET plastic packing belt, wherein the linear speed of the stretch forming is 120-150 m/min.
Example 1
A production method of a PET plastic packing belt comprises the following production process flows:
feeding the raw materials into a film crusher to crush to obtain crushed pieces, wherein the bulk density of the obtained crushed pieces is 0.5kg/m3。
And (3) feeding the scrap materials into a material sorting machine for sorting to obtain PET scrap materials, wherein the purity of the PET scrap materials is more than or equal to 95%.
And (3) conveying the PET scrap material into a vacuum drier for drying treatment to obtain a dehumidified material, wherein the drying temperature of the vacuum drying is 160 ℃, the vacuum degree is 200Pa, and the nitrogen amount is 0.1 MPa.
After the dehumidified material is fed into a forced feeding machine with the rotating speed of 20rpm for forced feeding, the dehumidified material is input into a screw extruder for extrusion and melting to obtain an extruded material, wherein the extrusion and melting process parameters are as follows: the current was 250A, the temperature was 260 ℃ and the rotation speed was 25 rpm.
And (3) feeding the extruded material into a vacuum reaction kettle for vacuum reaction to obtain a melt, wherein the vacuum degree of the vacuum reaction kettle is 10Pa, and the viscosity of the melt after reaction is 0.7 ml/g.
And (3) feeding the melt into a stretch forming machine for stretch forming treatment to obtain a PET plastic packing belt, wherein the linear speed of the stretch forming is 120 m/min.
Example 2
A production method of a PET plastic packing belt comprises the following production process flows:
feeding the raw materials into a film crusher to crush to obtain crushed pieces, wherein the bulk density of the obtained crushed pieces is 0.6kg/m3。
And (3) feeding the scrap materials into a material sorting machine for sorting to obtain PET scrap materials, wherein the purity of the PET scrap materials is more than or equal to 95%.
And (3) conveying the PET scrap material into a vacuum drier for drying treatment to obtain a dehumidified material, wherein the drying temperature of the vacuum drying is 120 ℃, the vacuum degree is 160Pa, and the nitrogen amount is 0.1 MPa.
After the dehumidified material is fed into a forced feeding machine with the rotating speed of 20rpm for forced feeding, the dehumidified material is input into a screw extruder for extrusion and melting to obtain an extruded material, wherein the extrusion and melting process parameters are as follows: the current was 200A, the temperature was 260 ℃ and the rotational speed was 25 rpm.
And (3) feeding the extruded material into a vacuum reaction kettle for vacuum reaction to obtain a melt, wherein the vacuum degree of the vacuum reaction kettle is 15Pa, and the viscosity of the melt after reaction is 0.7 ml/g.
And (3) feeding the melt into a stretch forming machine for stretch forming treatment to obtain a PET plastic packing belt, wherein the linear speed of the stretch forming is 120 m/min.
Example 3
A production method of a PET plastic packing belt comprises the following production process flows:
feeding the raw materials into a film crusher to crush to obtain crushed pieces, wherein the bulk density of the obtained crushed pieces is 0.7kg/m3。
And (3) feeding the scrap materials into a material sorting machine for sorting to obtain PET scrap materials, wherein the purity of the PET scrap materials is more than or equal to 95%.
And (3) conveying the PET scrap material into a vacuum drier for drying treatment to obtain a dehumidified material, wherein the drying temperature of the vacuum drying is 140 ℃, the vacuum degree is 200Pa, and the nitrogen amount is 0.1 MPa.
After the dehumidified material is fed into a forced feeding machine with the rotating speed of 20rpm for forced feeding, the dehumidified material is input into a screw extruder for extrusion and melting to obtain an extruded material, wherein the extrusion and melting process parameters are as follows: the current was 250A, the temperature was 260 ℃ and the rotational speed was 27 rpm.
And (3) feeding the extruded material into a vacuum reaction kettle for vacuum reaction to obtain a melt, wherein the vacuum degree of the vacuum reaction kettle is 25Pa, and the viscosity of the melt after reaction is 0.7 ml/g.
And (3) feeding the melt into a stretch forming machine for stretch forming treatment to obtain a PET plastic packing belt, wherein the linear speed of stretch forming is 130 m/min.
Example 4
A production method of a PET plastic packing belt comprises the following production process flows:
feeding the raw materials into a film crusher to crush to obtain crushed pieces, wherein the bulk density of the obtained crushed pieces is 0.8kg/m3。
And (3) feeding the scrap materials into a material sorting machine for sorting to obtain PET scrap materials, wherein the purity of the PET scrap materials is more than or equal to 95%.
And (3) conveying the PET scrap material into a vacuum drier for drying treatment to obtain a dehumidified material, wherein the drying temperature of the vacuum drying is 160 ℃, the vacuum degree is 250Pa, and the nitrogen amount is 0.2 MPa.
Feeding the dehumidified material into a forced feeder with the rotating speed of 20rpm for forced feeding, and then inputting the dehumidified material into a screw extruder for extrusion and melting to obtain an extruded material, wherein the extrusion and melting process parameters are as follows: the current was 270A, the temperature was 280 ℃ and the rotation speed was 32 rpm.
And (3) feeding the extruded material into a vacuum reaction kettle for vacuum reaction to obtain a melt, wherein the vacuum degree of the vacuum reaction kettle is 30Pa, and the viscosity of the melt after reaction is 0.8 ml/g.
And (3) feeding the melt into a stretch forming machine for stretch forming treatment to obtain a PET plastic packing belt, wherein the linear speed of the stretch forming is 150 m/min.
The PET plastic strapping tape prepared in example 1 above was tested for sample characteristics and conditions: the strip-shaped glass has a perfect appearance and the model specification is as follows: 16mm (wide) x 0.8mm (thick), quantity: item 1, test basis: QB/T22344-.
TABLE 1 test results
Serial number Detecting items Unit of(symbol) Standard requirements The result of the detection One-way decision
1 Deviation of width mm ±0.02 16.02 Qualified
2 Deviation in thickness mm ±0.02 0.82 Qualified
3 Breaking tension N 499 486 Qualified
4 Elongation at break ％ ≤25 14 Qualified
5 Breaking strength MPa 38 37 Qualified
As can be seen from table 1 above, using the scheme provided by the embodiments of the present invention, acceptable PET plastic strapping bands can be prepared.
Comparative example 1
A production method of a PET plastic packing belt comprises the following production process flows:
feeding the raw materials into a film crusher to crush to obtain crushed pieces, wherein the bulk density of the obtained crushed pieces is 0.5kg/m3。
And (3) feeding the scrap materials into a material sorting machine for sorting to obtain PET scrap materials, wherein the purity of the PET scrap materials is more than or equal to 95%.
And (3) conveying the PET scrap material into a vacuum drier for drying treatment to obtain a dehumidified material, wherein the drying temperature of the vacuum drying is 100 ℃, the vacuum degree is 200Pa, and the nitrogen amount is 0.1 MPa.
After the dehumidified material is fed into a forced feeding machine with the rotating speed of 20rpm for forced feeding, the dehumidified material is input into a screw extruder for extrusion and melting to obtain an extruded material, wherein the extrusion and melting process parameters are as follows: the current was 250A, the temperature was 260 ℃ and the rotation speed was 25 rpm.
And (3) feeding the extruded material into a vacuum reaction kettle for vacuum reaction to obtain a melt, wherein the vacuum degree of the vacuum reaction kettle is 10Pa, and the viscosity of the melt after reaction is 0.5 ml/g.
And (3) feeding the melt into a stretch forming machine for stretch forming treatment to obtain a PET plastic packing belt, wherein the linear speed of the stretch forming is 120 m/min.
Because the raw materials are not fully dried and contain a large amount of moisture, the melt is degraded, the viscosity of the melt after reaction is 0.5ml/g, the viscosity is very low, an unqualified packing belt is obtained, the width of the packing belt is 16mm, the thickness of the packing belt is 0.8mm, the tensile strength of the packing belt is 22MPa, the breaking elongation is 32%, and the packing belt has a plurality of brittle points or is completely brittle.
Comparative example 2
A production method of a PET plastic packing belt comprises the following production process flows:
feeding the raw materials into a film crusher to crush to obtain crushed pieces, wherein the bulk density of the obtained crushed pieces is 0.5kg/m3。
And (3) feeding the scrap materials into a material sorting machine for sorting to obtain PET scrap materials, wherein the purity of the PET scrap materials is more than or equal to 95%.
And (3) conveying the PET scrap material into a vacuum drier for drying treatment to obtain a dehumidified material, wherein the drying temperature of the vacuum drying is 160 ℃, the vacuum degree is 200Pa, and the nitrogen amount is 0.1 MPa.
After the dehumidified material is fed into a forced feeding machine with the rotating speed of 20rpm for forced feeding, the dehumidified material is input into a screw extruder for extrusion and melting to obtain an extruded material, wherein the extrusion and melting process parameters are as follows: the current was 250A, the temperature was 320 ℃ and the rotation speed was 25 rpm.
And (3) feeding the extruded material into a vacuum reaction kettle for vacuum reaction to obtain a melt, wherein the vacuum degree of the vacuum reaction kettle is 10Pa, and the viscosity of the melt after reaction is less than or equal to 0.52 ml/g.
And (3) feeding the melt into a stretch forming machine for stretch forming treatment to obtain a PET plastic packing belt, wherein the linear speed of the stretch forming is 120 m/min.
Due to the fact that the melt is degraded at high temperature in the screw, molecular chains are broken, the viscosity of the melt after reaction is 0.52ml/g, the viscosity is very low, a packing belt which does not meet the requirements is obtained, the width of the packing belt is 16mm, the thickness of the packing belt is 0.8mm, the tensile strength of the packing belt is 24MPa, the breaking elongation of the packing belt is 30%, and the packing belt is provided with a plurality of brittle points or is completely brittle.
Comparative example 3
A production method of a PET plastic packing belt comprises the following production process flows:
feeding the raw materials into a film crusher to crush to obtain crushed pieces, wherein the bulk density of the obtained crushed pieces is 0.5kg/m3。
And (3) feeding the scrap materials into a material sorting machine for sorting to obtain PET scrap materials, wherein the purity of the PET scrap materials is more than or equal to 95%.
And (3) feeding the PET scrap material into a vacuum drier for drying treatment to obtain a dehumidified material, wherein the drying temperature of vacuum drying is 160 ℃, the vacuum degree is 200Pa, and the nitrogen amount is 0.1 MPa.
After the dehumidified material is fed into a forced feeding machine with the rotating speed of 20rpm for forced feeding, the dehumidified material is input into a screw extruder for extrusion and melting to obtain an extruded material, wherein the extrusion and melting process parameters are as follows: the current was 250A, the temperature was 260 ℃ and the rotation speed was 25 rpm.
And (3) feeding the extruded material into a vacuum reaction kettle for vacuum reaction to obtain a melt, wherein the vacuum degree of the vacuum reaction kettle is 50Pa, and the viscosity of the melt after reaction is 0.4 ml/g.
And (3) feeding the melt into a stretch forming machine for stretch forming treatment to obtain a PET plastic packing belt, wherein the linear speed of the stretch forming is 120 m/min.
As the vacuum degree of the reaction kettle is 50Pa higher than the set maximum value, the vacuum degree is poor, the impurity purity is greatly reduced, the melt is degraded, the viscosity of the melt after reaction is 0.4ml/g, the viscosity is very low, an unqualified packing belt is obtained, the width of the packing belt is 16mm, the thickness of the packing belt is 0.8mm, the tensile strength of the packing belt is 20MPa, the elongation at break of the packing belt is 34%, and the number of brittle points is more or the packing belt is completely crisp.
Comparative example 4
A production method of a PET plastic packing belt comprises the following production process flows:
feeding the raw materials into a film crusher to crush to obtain crushed pieces, wherein the bulk density of the obtained crushed pieces is 0.5kg/m3。
The scrap was not sorted, and the purity of PET scrap was 80% and the PVC content was 10%.
And (3) conveying the PET scrap material into a vacuum drier for drying treatment to obtain a dehumidified material, wherein the drying temperature of the vacuum drying is 160 ℃, the vacuum degree is 200Pa, and the nitrogen amount is 0.1 MPa.
After the dehumidified material is fed into a forced feeding machine with the rotating speed of 20rpm for forced feeding, the dehumidified material is input into a screw extruder for extrusion and melting to obtain an extruded material, wherein the extrusion and melting process parameters are as follows: the current was 250A, the temperature was 260 ℃ and the rotation speed was 25 rpm.
And (3) feeding the extruded material into a vacuum reaction kettle for vacuum reaction to obtain a melt, wherein the vacuum degree of the vacuum reaction kettle is 10Pa, and the viscosity of the melt after reaction is 0.3 ml/g.
And (3) feeding the melt into a stretch forming machine for stretch forming treatment to obtain a PET plastic packing belt, wherein the linear speed of the stretch forming is 120 m/min.
Because PVC cracks PET seriously, the melt can not form casting belt.
To sum up, the embodiment of the invention provides a production method of a PET plastic packing belt, which comprises the following steps: the waste printing film is used as a raw material, and the raw material is subjected to the following steps: crushing, sorting, drying, extruding, vacuum reacting and stretching forming. The method can be used for producing the qualified PET plastic packing belt, realizes the recycling of the printed waste film, solves the problem of environmental pollution caused by directly discarding the film, and has the advantages that the film is difficult to degrade and various components cause environmental pollution; the waste and old film recycling packaging belt is used for directly solving the problem of waste and old film recycling, and the economic benefit is increased by production and packaging.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A production method of a PET plastic packing belt is characterized by comprising the following steps: taking a waste printing film as a raw material, and carrying out the following steps of: crushing, sorting, drying, extruding, tackifying and stretching and forming to obtain the PET plastic packing belt.
2. The production method according to claim 1, wherein the raw material is fed into a film crusher to be crushed into pieces;
preferably, the bulk density of the said flakes is 0.5-0.8Kg/m3。
3. The production method according to claim 2, wherein the scrap material is sent to a material sorting machine for sorting to obtain PET scrap material;
preferably, the purity of the PET flaked pieces is more than or equal to 95 percent.
4. The production method according to claim 3, wherein the PET scrap material is sent into a vacuum drier to be dried to obtain a dehumidified material;
preferably, the drying temperature of the vacuum drying is 100-160 ℃, the vacuum degree is 100-250Pa, and the nitrogen amount is 0.1-0.2 MPa.
5. The production method according to claim 4, wherein the dehumidified material is fed into a forced feeder for forced feeding, and then fed into a screw extruder for melt extrusion to obtain an extruded material;
preferably, the speed of the forced feeder is 10-32 rpm.
6. The production method according to claim 5, wherein the extrusion process parameters are: the current is 150-270A, the temperature is 250-280 ℃, and the rotating speed is 10-32 rpm.
7. The production method according to claim 6, wherein the extrudate is fed into a vacuum reactor to be tackified to obtain a melt;
preferably, the vacuum degree of the vacuum reaction kettle is 1-30Pa, and the viscosity of the melt material obtained by tackifying treatment is 0.7ml/g-0.8 ml/g.
8. The production method according to claim 7, wherein the molten material is fed into a stretch-forming machine to be subjected to a stretch-forming treatment to obtain a PET plastic strapping band;
preferably, the linear speed of stretch forming is 120-150 m/min.
9. A PET plastic strapping band produced according to the production method of any one of claims 1 to 8.
10. The PET plastic strapping tape as claimed in claim 9, wherein the PET plastic strapping tape has a width of 10-32mm, a thickness of 0.5-1.5mm, a tensile strength of 25-50MPa, an elongation at break of 25% or less, and 0 brittle point.
CN202210275553.2A 2022-03-21 2022-03-21 Production method of PET plastic packing belt Pending CN114571691A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5225130A (en) * 1990-10-30 1993-07-06 Hoechst Aktiengesellschaft Process for reclaiming thermally strained polyester scrap material
CN102442474A (en) * 2010-09-30 2012-05-09 上海自立塑料制品有限公司 PET (Polyethylene Terephthalate) packing belt and processing method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5225130A (en) * 1990-10-30 1993-07-06 Hoechst Aktiengesellschaft Process for reclaiming thermally strained polyester scrap material
CN102442474A (en) * 2010-09-30 2012-05-09 上海自立塑料制品有限公司 PET (Polyethylene Terephthalate) packing belt and processing method thereof

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