IE81027B1 - A process for transforming a starting material containing at least two different thermoplastic materials into a new homogeneous thermoplastic material - Google Patents
A process for transforming a starting material containing at least two different thermoplastic materials into a new homogeneous thermoplastic materialInfo
- Publication number
- IE81027B1 IE81027B1 IE921207A IE921207A IE81027B1 IE 81027 B1 IE81027 B1 IE 81027B1 IE 921207 A IE921207 A IE 921207A IE 921207 A IE921207 A IE 921207A IE 81027 B1 IE81027 B1 IE 81027B1
- Authority
- IE
- Ireland
- Prior art keywords
- treatment
- copolymers
- process according
- rotor
- chamber
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 26
- 239000012815 thermoplastic material Substances 0.000 title claims description 14
- 239000007858 starting material Substances 0.000 title description 8
- 230000001131 transforming effect Effects 0.000 title description 2
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 25
- 238000003756 stirring Methods 0.000 claims abstract description 14
- 238000013019 agitation Methods 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims description 26
- 229920001577 copolymer Polymers 0.000 claims description 18
- 239000002245 particle Substances 0.000 claims description 14
- 229920003023 plastic Polymers 0.000 claims description 13
- 239000004033 plastic Substances 0.000 claims description 13
- 229920000642 polymer Polymers 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 5
- 238000005265 energy consumption Methods 0.000 claims description 4
- 238000005469 granulation Methods 0.000 claims description 4
- 230000003179 granulation Effects 0.000 claims description 4
- 238000001746 injection moulding Methods 0.000 claims description 4
- 239000011343 solid material Substances 0.000 claims description 4
- 206010001497 Agitation Diseases 0.000 claims 3
- 239000000203 mixture Substances 0.000 abstract description 23
- 238000007599 discharging Methods 0.000 abstract description 2
- 230000001681 protective effect Effects 0.000 abstract description 2
- 239000004416 thermosoftening plastic Substances 0.000 abstract description 2
- 239000000126 substance Substances 0.000 description 12
- 239000008187 granular material Substances 0.000 description 6
- 239000002699 waste material Substances 0.000 description 6
- 238000002156 mixing Methods 0.000 description 5
- 239000012467 final product Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 235000011837 pasties Nutrition 0.000 description 4
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 4
- 239000004926 polymethyl methacrylate Substances 0.000 description 4
- 239000004952 Polyamide Substances 0.000 description 3
- -1 Polypropylene Polymers 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 229920002647 polyamide Polymers 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 2
- 238000001311 chemical methods and process Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000010794 food waste Substances 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229940063583 high-density polyethylene Drugs 0.000 description 1
- 238000011090 industrial biotechnology method and process Methods 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 229940099514 low-density polyethylene Drugs 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000004634 thermosetting polymer Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- B29B17/0404—Disintegrating plastics, e.g. by milling to powder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/50—Mixing receptacles
-
- 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
- B29B7/00—Mixing; Kneading
- B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
- B29B7/22—Component parts, details or accessories; Auxiliary operations
- B29B7/28—Component parts, details or accessories; Auxiliary operations for measuring, controlling or regulating, e.g. viscosity control
- B29B7/283—Component parts, details or accessories; Auxiliary operations for measuring, controlling or regulating, e.g. viscosity control measuring data of the driving system, e.g. torque, speed, power
-
- 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
- B29B7/00—Mixing; Kneading
- B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
- B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
- B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
- B29B7/40—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft
- B29B7/44—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft with paddles or arms
-
- 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
- B29B2017/0424—Specific disintegrating techniques; devices therefor
- B29B2017/0476—Cutting or tearing members, e.g. spiked or toothed cylinders or intermeshing rollers
-
- 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
- Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
- Laminated Bodies (AREA)
- Glass Compositions (AREA)
- Other Resins Obtained By Reactions Not Involving Carbon-To-Carbon Unsaturated Bonds (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Disintegrating Or Milling (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
- Peptides Or Proteins (AREA)
- Graft Or Block Polymers (AREA)
- Polymerisation Methods In General (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The device comprises a cylindrical chamber (2) fitted with a loading hopper (4) and with a discharging well (5). A rotor (6) fitted with blades (31, 32) is driven in rotation by an electric motor (7) via a clutch (18). The chamber (2) and the bearings (22) of the rotor (6) are surrounded by a protective shroud (26). In the chamber (2), a mixture containing at least two different thermoplastic polymers is subjected to stirring (agitation) by the blades (31, 32) of the rotor (6), and this treatment is stopped after the appearance of a rapid increase in the energy consumed. A homogeneous thermoplastic is thus obtained.
Description
A PROCESS FOR TRANSFORMING A STARTING MATERIAL CONTAINING AT LEAST TWO DIFFERENT THERMOPLASTIC MATERIALS INTO A NEW HOMOGENEOUS THERMOPLASTIC MATERIAL i I £, B £. V / The present invention concerns a process of treatment of plastic materials containing at least two different thermoplastic polymers or copolymers into an homogeneous thermoplastic material, according to which the said polymers or copolymers are subjected, in a divided state, to agitation and stirring.
The aim ot the invention is in particular to enable the obtention of a new thermoplastic material, capable of being used in the same manner and in the same fields of industrial application as the known thermoplastic materials, from at least two thermoplastic materials of different chemical nature.
The invention more particularly aims at enabling the recycling of thermoplastic polymers or copolymers, without prior separation of such polymers or copolymers according to their chemical nature.
As it is known, it is desirable to re-use waste plastic materials, such as those arising from the disposal of packaging articles or material mixed with food residues in domestic refuse, in order to avoid, or at least to reduce the accumulation of this waste in the nature, and also to slow down the depletion of sources of nonrenewable raw materials, in particular the crude oil that goes into the manufacture of plastic materials.
According to the present day techniques, recycling thermoplastic polymers necessitates the separate recovery and re-use of plastic materials of differing chemical nature, because generally they are non miscible with one another and when one tries to re-use mixtures of solid particles of different thermoplastic polymers while using the same machines and the same operation conditions as those employed in the case of a single thermoplastic polymer, articles are obtained which are made of heterogeneous material, of which the mechanical, physical and chemical characteristics, such as the elasticity modulus, the values of tensile strength, flexural strength, compressive strength, resistance to the chemical attack by various liquid or gaseous substances, etc., are not well determined.
In practice, the need for recovering and re-using separately the different thermoplastic polymers places a limitation of an economic order which reduces considerably the possibilities of recycling waste plastic materials, in particular those which are contained in domestic refuse.
Patent application No EP-A-0 140846 proposes a process in which waste plastics materials are subjected to a treatment in four consecutive steps, namely: (1) grinding, (2) cold blending, (3) heating in a first phase, (4) heating in a second phase. The steps (3) and (4) are effected by an external heating source such as electric heating elements. On the other hand, it is specified in this patent application that one should avoid subjecting the waste to significant mechanical tensions.
Patent Application no EP-A-0 244121 describes a process for blending a composition of polymers, using the determination of several variables of blending such as the temperature, the duration and the energy for controlling the blending step. However, it does not propose and does not permit obtaining a new plastics material from plastics material of different chemical natures. 2a The process according to the invention is characterised in that agitation and stirring is effected with an energy and for a duration such that a sharp increase of the energy consumed by the agitator and the stirring means occurs, and in that the treatment is stopped after occurrence of a sharp increase in the energy consumption. The process is in this way based on the absorption and mechanical energy of the polymers or copolymers without the necessity to provide external thermal energy, and on a single treatment step. It is possible to intervene in the physio-chemical phenomenon which results, in an unexpected manner in the formation of a new plastics material as compared to the starting materials and having desirable and pre-determinable properties.
Said treatment is advantageously carried out in a closed chamber provided with mechanical agitator means. Said mechanical agitator means advantageously co-operate with means for measuring the energy which is absorbed by the material which is submitted to said treatment, and they comprise at least one agitator member which is, for example comprised of a rotor provided with a plurality of blades.
The chemical or physico-chemical process or processes which take place in the course of the implementation of the process ensuring the transformation of the initial mixture of different thermoplastic polymers into a homogeneous material are not yet fully elucidated, and the invention is not limited in any way by the nature of these processes, nor by the order in which they proceed, nor by their duration.
It appears, however, that during the agitation and the stirring treatment of the mixture of thermoplastic polymers or copolymers, the solid particles undergo simultaneously a fast individual heating due to their mutual friction and/or their friction against the agitator members and the walls of the treatment chamber, so that they practically all find themselves heated at the same time to a temperature comprised within each of their respective softening ranges. It also seems that a decrease occurs in the average size of the particles at a certain stage of the treatment, at which at least one portion of the particles still remain in the solid state or at which at least one portion of the particles are at least partly liquid or in a pasty state.
Whatever the reason, one notes a relatively abrupt transition from a stage in which the different individual thermoplastic polymer or copolymer particles of the initial mixture are separated from one another and can be observed individually, and a later stage in which it is not possible any more to distinguish separation interfaces between these particles and in which the entire mass has taken a homogeneous appearance, except for the possible occurrence of particles of material non miscible with the thermoplastic polymers.
These phenomena are totally surprising, considering that we can be dealing with polymer particles with a relatively low melting point, for example polyolefins, and with polymer particles with a relatively high melting point, such as polyamides.
The temperature reached within the mixture of thermoplastic polymers or copolymers subjected to the treatment according to the present process are generally comprised within the range from 150° to 300° C.
The homogeneous mass resulting from the agitation and the stirring treatment is generally obtained in the form of a paste having rheological characteristics corresponding to the so-called pseudoplastic state.
Advantageously, this homogeneous pasty mass is immediately subjected to a granulation treatment designed to put it in the form of granules of the usual type suitable for use in the machines manufacturing moulded or injected parts, according to known industrial techniques.
To this end, one can use any granulating machine of a known type, for example using extrusion under pressure. Advantageously, and also in a manner known per se, filtering of the paste is carried out during the granulating operation, for example by means of a sieve of wire meshing, in such a manner as to separate the particles of solid material possibly contained in this paste. Such particles of solid material can consist of thermosetting polymers, of metals, of inorganic materials, such as debris of stone, glass, etc... and generally of any material non miscible with the thermoplastic polymers.
The invention is, in particular, applicable to the treatment of a starting material containing at least two different thermoplastic polymers or copolymers in a divided state, and at least one solid material which is not miscible with said thermoplastic polymers or copolymers. At least one filtering step of the obtained product is then carried out, so as to separate therefrom the particles of material different from said homogeneous thermoplastic material which are dispersed in this latter material.
One can carry out the process according to the invention continuously or non-continuously, i.e. by treating the initial mixture of thermoplastic polymers or copolymers by successive batches.
A device for carrying out the process is characterized in that it comprises a chamber provided with agitator and stirrer means; means for introducing a starting material to be treated into this chamber; and means for discharging out of this chamber the product obtained by the treatment of starting material in this chamber.
Advantageously, the agitator means comprise at least one propeller or one rotor provided with blades and rotating at a high speed, for example having a rotational speed comprised between 1000 and 2800 rpm.
However, one can use any other appropriate agitator and/or stirrer and/or mixing means, mechanical or non-mechanical.
According to one particularly advantageous embodiment of this device, said chamber is of a cylindrical shape and with a horizontal axis, and said agitator and stirrer means consist of a rotor provided with a plurality of blades, this rotor being mounted coaxially with respect to the axis of the chamber and extending therethrough, and being connected to drive means for rotating the rotor, disposed outside the chamber.
The object of the invention is also the application of the above mentioned process to the obtention of plastic material parts, characterized in that the product is put into the form of parts shaped by injection moulding.
The invention will be better understood from the following detailed description of non-limiting exemplary embodiments of the process according to the invention and of an exemplary embodiment, also non-limiting, of a device for carrying out this process, wherein reference is made to the appended drawing, in which: Fig. 1 is a schematic front view of the device; Fig. 2 is a schematic front view of a portion of the device shown in Fig. 1; Fig. 3 is a schematic view of the same portion of the device as Fig. 2, but with certain elements and members shown in cross-section; io Fig. 4 is a schematic cross-sectional view of the device; and Fig. 5 is a partial schematic view of a rotor forming part of the device.
The device shown in the Figures 1 to 5 comprises a cylindrical chamber 2 with a horizontal axis, provided with a feeding hopper 4 placed in an upper position and a discharge well 5. A rotor 6, mounted co-axially inside the chamber 2, is operated by means of an electric motor 7. The walls of the chamber 2 consist of an assembly 10 formed by uniting two semi-cylindrical shells 11 and 12, assembled together by means of a hinge along one lateral edge 13 and a safety closing device 14 is disposed along the edge 15 opposite the edge 14.
The upper shell 12 is connected to a pneumatic device 16 of a type known per se which makes possible its opening by pivoting around the hinge 13. The driving motion of the rotor 6 by the motor 7 is transmitted by means of a pneumatically controlled clutch 18. The rotation of rotor 6 can be interrupted at will by means of a braking device 21, also pneumatically controlled.
The rotor 6 is supported at each of its ends by a bearing 22, fastened on a pillar 23. A threaded joint 24 makes it possible to pass each end of the shaft of the rotor 6 tightly through the wall of the chamber 2.
A protective cover 26 (Fig. 1) surrounds the portion of the device comprising the chamber 2 and the rotor bearings 22.
As can best be seen in Fig. 5, the rotor 6 comprises a cylindrical shaft 30 provided with a plurality of radial blades 31, 32, the shapes of which are of two different types. More precisely, the orientation of the blades 32, which are mounted in the vicinity of each end of the shaft 30 is such that it acts to impart to a load of material being treated in the chamber 2 a motion which tends to push this material away from the chamber wall adjoining the ends of the shaft 30 to bring it back towards the inside of the chamber, through the region subjected to the agitation and stirring action of the blades 31.
Advantageously, the diameter of the chamber 2 and the length of the blades 31 and 32 are such that, when the rotor 6 is at room temperature or in the vicinity of this temperature, the clearance between the tips of the blades 31 and 32 and the inner wall 40 of chamber 2 is in the order of 0.5 to 1 mm.
It has been found advantageous that the rotor 6 and its drive motor 7 be dimensioned relatively to the inner volume of the chamber 2, so that the maximum mechanical power transferable to the material being treated in the chamber 2 by the rotor 6 be in the order of 1 to 2 kW for each litre of this material. For example, for a total inner volume of the chamber 2 of 85 litres (case of an experimental prototype), it was found that the maximum power delivered by the motor is advantageously in the order of 128 kW.
Example 1 : The starting material used is a mixture of thermoplastic polymers, in the form of irregularly shaped fragments, but all of dimensions lesser than 5 mm, originating from the recovery of waste plastic materials in domestic refuse and which, after their separation from the other components of the refuse, had simply been subjected to a wash with water, followed by drying.
The average composition of this mixture is the following (in 5 percent weight) : ABS resin : 50 Polyvinyl chloride 20 Polypropylene 15 Polyethylene 5 Polyamide : 5 Polymethylmethacrylate (PMMA) 5 For the treatment of this mixture, a device of the above described kind is used in which the agitation and stirring chamber has an inner volume of 85 litres, the motor used for driving the rotor being a three-phase electric motor with a pole changer, with a maximum power of 140 kW, supplied with a 380 V/50 Herz current, with a cosinus phi value of 0.85. After a time of rotation of the rotor in the order of three minutes, one notes a steep increase, immediately followed by a stabilization, of the power consumption by the mass subjected to the agitation and stirring, which shows a peak in the intensity of the current supplied to the motor, reaching a maximum value in the order of 270 to 280 A at the top of the peak. The duration of the rise of the intensity of the current between the initial value and the top of the peak as well as that of the subsequent fall of the intensity (to a stabilized value which is above the initial value) are both of about 5 seconds. The time of rotation of the rotor is extended during about 10 to 20 seconds after the stabilization of the intensity of the current supplied to the drive motor of the rotor, then the rotor is stopped and the homogeneous gel-like pasty mass resulting from the treatment of the mixture of polymers is immediately recovered.
This mass is subjected either immediately after its recovery from the treatment chamber or after its solidification by cooling, to a granulation treatment through extrusion in a machine of a known type, with filtration by means of a sieve of wire meshing. Granules of thermoplastic material of a size of about 3 mm are thus obtained, of a perfectly homogeneous appearance, even when examinations are carried out with a magnifying glass. These granules are perfectly adapted for use in an industrial injection moulding machine, in the same manner as granules of pure thermoplastic ABS resin, making it possible to obtain moulded parts of excellent quality which exhibit a perfect isotropy of the mechanical and physical properties.
Example 2 : The procedure is the same as in example 1, except that a mixture of thermoplastic polymers is used as raw material having the following average composition (in percent weight) : Polyethylene (a mixture of equal parts of high-density and low- density polyethylene) : 45 Polystyrene 20 Polyvinyl chloride 20 Mixture of two equal parts of polyester and of polyamide : 12 Polymethylmethacrylate (PMMA) 3 One notes, after a time of rotation of the rotor of about 90 seconds, a peak in the intensity of the current supplied to the motor, reaching a maximum value in the order of 230 A. The time of rotation is extended as in Example 1 during about 10 to 20 seconds after this peak, before recovering the homogeneous gel-like pasty mass of a pseudoplastic consistency, resulting from the treatment Granulation is then carried out through extrusion, with filtration of the paste, as in Example 1.
Homogeneous granules of thermoplastic material are thus obtained, which are suited for use in an industrial injection moulding machine, in a manner similar to the use of granules of pure highdensity polyethylene resin.
It should be noted that the process which has just been described, is perfectly adapted for obtaining a thermoplastic material having predetermined properties, intermediate between those of the various initial polymers and copolymers and that it is possible to keep constant the properties of the final product, even in case of fluctuations of the average composition of the mixtures used as raw material.
In actual fact, and as it will be obvious to those skilled in the art, one only needs to analyze the starting materials and the final product to determine the amounts of thermoplastic polymers or copolymers of one or several types to be added to the starting mixtures to achieve the corrections necessary for obtaining a final product having the desired properties and to maintain these properties in case of variation of the composition of the raw materials.
Obviously, one can add to the mixtures of thermoplastic polymers or copolymers in a manner known per se, any substance or mixtures of substances capable of improving the properties of the final thermoplastic material, for example plastifiers, stabilizing agents, colorants, fillers, etc... and it is clear that owing to the nature itself of the operations of the process, which comprise a stirring and an agitation which are particularly efficient, a perfectly homogeneous distribution of these substances is achieved in the final product.
Claims (7)
1. A process of treatment of plastic materials comprising at least two different thermoplastic polymers or copolymers according to which said polymers or copolymers are subjected, in a divided state, to a treatment of agitation and stirring by agitation and stirring means, characterised in that the agitation and stirring is effected with an energy and for a duration such that a sharp increase of the energy consumed by the agitator and the stirring means occurs, and in that the treatment is stopped after occurrence of a sharp increase in the energy consumption.
2. A process according to claim 1 characterised in that the treatment is stopped when a substantially constant value of the energy consumption is achieved after said increase of energy consumption.
3. A process according to any one of the preceding claims for the treatment of a raw material containing at least two different thermoplastic polymers or copolymers in a divided state, and at least one solid material which is not miscible with said thermoplastic polymers or copolymers, characterised in that at least one filtering step of the obtained product is carried out, so as to separate therefrom the particles of material different from said homogeneous thermoplastic material which are dispersed therein.
4. A process according to anyone of the preceding claims, characterised in that the product is subjected to a granulation treatment.
5. The application of the process according to claim 1 for the obtention of parts of plastic material, characterised in that the product is put in the form of parts shaped by injection moulding.
6. A process according to any one of claims 1 to 4 substantially as described herein with reference to the Examples and/or substantially as described and/or illustrated with 5 reference to the accompanying drawings.
7. A product whenever produced by a process according to any one of claims 1 to 4 or
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT91TO288 IT1245070B (en) | 1991-04-16 | 1991-04-16 | PROCEDURE AND DEVICE FOR THE HOMOGENIZATION OF WASTE OF PLASTIC MATERIAL OF A DIFFERENT NATURE FOR THE PURPOSE OF A REUSE OF THE SAME SIZES |
Publications (2)
Publication Number | Publication Date |
---|---|
IE921207A1 IE921207A1 (en) | 1992-10-21 |
IE81027B1 true IE81027B1 (en) | 1999-10-20 |
Family
ID=11409252
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IE921207A IE81027B1 (en) | 1991-04-16 | 1992-04-15 | A process for transforming a starting material containing at least two different thermoplastic materials into a new homogeneous thermoplastic material |
Country Status (41)
Country | Link |
---|---|
EP (1) | EP0539534B2 (en) |
JP (1) | JPH05508122A (en) |
KR (1) | KR100216084B1 (en) |
CN (2) | CN1063700C (en) |
AT (1) | ATE171101T1 (en) |
AU (2) | AU653011B2 (en) |
BE (1) | BE1005779A4 (en) |
BG (1) | BG61833B1 (en) |
BR (1) | BR9205235A (en) |
CA (1) | CA2085236C (en) |
CH (1) | CH688276A5 (en) |
DE (2) | DE4291173T1 (en) |
DK (2) | DK0539534T3 (en) |
DZ (1) | DZ1571A1 (en) |
EG (1) | EG19667A (en) |
ES (2) | ES2085201B1 (en) |
FI (1) | FI925446A (en) |
FR (1) | FR2675422B1 (en) |
GB (1) | GB2260329B (en) |
GR (1) | GR1001132B (en) |
HR (1) | HRP920449B1 (en) |
HU (1) | HU215792B (en) |
IE (1) | IE81027B1 (en) |
IL (2) | IL101563A (en) |
IT (1) | IT1245070B (en) |
LU (1) | LU88199A1 (en) |
MX (1) | MX9201792A (en) |
NL (1) | NL9220001A (en) |
NO (1) | NO310281B1 (en) |
NZ (1) | NZ242352A (en) |
OA (1) | OA09799A (en) |
PL (1) | PL169931B1 (en) |
PT (1) | PT100385B (en) |
RO (1) | RO110133B1 (en) |
RU (1) | RU2118931C1 (en) |
SE (1) | SE508021C2 (en) |
TN (1) | TNSN92031A1 (en) |
UY (1) | UY23401A1 (en) |
WO (2) | WO1992018310A1 (en) |
YU (1) | YU48287B (en) |
ZA (1) | ZA922833B (en) |
Families Citing this family (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4301066A1 (en) * | 1993-01-16 | 1994-07-21 | Igu Umweltschutzanlagen | Method and device for processing plastic waste |
AUPM621894A0 (en) * | 1994-06-10 | 1994-07-07 | Ri-Industries | Plastic recycler |
US5503788A (en) * | 1994-07-12 | 1996-04-02 | Lazareck; Jack | Automobile shredder residue-synthetic plastic material composite, and method for preparing the same |
DE19500174C1 (en) * | 1995-01-05 | 1996-07-18 | Ermafa Kunststofftechnik Chemn | Process for producing agglomerate from plastic waste |
US5674033A (en) * | 1995-05-05 | 1997-10-07 | Ruegg; Thomas Arthur | Vehicle tie-down system for container |
US5801205A (en) * | 1995-06-19 | 1998-09-01 | Ein Engineering Co., Ltd. | Reprocessed resin formed of thermoset resin formed material, method for reprocessing thermoset resin foamed material and method for molding molded article formed of the reprocessed resin |
GB2339783A (en) * | 1998-07-21 | 2000-02-09 | Plasalloy Limited | Recovery and re-use of material from post-consumer waste |
JP2002292628A (en) * | 2001-03-28 | 2002-10-09 | Sony Corp | Method for reuse of used resin |
DK1404403T4 (en) | 2001-06-29 | 2017-01-30 | Coloplast As | catheter assembly |
US7682353B2 (en) | 2001-06-29 | 2010-03-23 | Coloplast A/S | Catheter device |
US7311698B2 (en) | 2001-09-24 | 2007-12-25 | Coloplast A/S | Urinary catheter assembly allowing for non-contaminated insertion of the catheter into a urinary canal |
JP2005053120A (en) * | 2003-08-05 | 2005-03-03 | Koohan:Kk | Method for molding synthetic resin product using synthetic resin waste material |
EP1595671A1 (en) * | 2004-05-10 | 2005-11-16 | New Generation Holding | Apparatus and process for recycling plastic materials |
JPWO2006035820A1 (en) * | 2004-09-28 | 2008-05-15 | リファインバース株式会社 | Method for producing regenerated modified resin compound and regenerated modified resin compound |
CN102062522B (en) * | 2010-11-24 | 2012-07-04 | 鑫海绳网制造有限公司 | Method and device for drying regenerated material granules |
CN102294767B (en) * | 2011-08-11 | 2014-10-29 | 南昌大学 | Method for recovering and granulating waste plastic |
BR112014003044B1 (en) | 2011-08-29 | 2020-10-13 | Coloplast A/S. | catheter kit |
CN105408078B (en) * | 2013-05-24 | 2018-08-10 | 波利维斯特知识产权代理有限责任公司 | The plastic products processed the system and method for plastics and thus processed |
AT517337B1 (en) | 2015-07-03 | 2017-01-15 | Sonderhoff Engineering Gmbh | mixing device |
CN105965714B (en) * | 2016-06-17 | 2024-06-28 | 东莞市昶丰机械科技有限公司 | Novel continuous mixing mill structure |
CN109382929B (en) * | 2017-08-10 | 2021-09-21 | 潍坊云鼎新材料科技有限公司 | Non-heating type high-speed melt blending machine |
CN107599202B (en) * | 2017-10-12 | 2019-09-17 | 青岛中嘉建设集团有限公司 | Building construction plastic granule agitator |
CN111645214A (en) * | 2020-06-12 | 2020-09-11 | 浙江富全塑业有限公司 | Plastic material mixing equipment for packaging container and operation method thereof |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1118959B (en) * | 1955-07-12 | 1961-12-07 | Draiswerke Ges Mit Beschraenkt | Method and device for the preparation of thermoplastics or thermosets |
FR1262631A (en) * | 1960-04-19 | 1961-06-05 | Lampe Norma Soc Auto Lampe | Further training in headlight adjustment devices and in particular for motor vehicles |
BE593873A (en) * | 1960-04-20 | |||
FR1263631A (en) * | 1960-04-20 | 1961-06-09 | Draiswerke Gmbh | Improvements to processes and devices for preparing plasticized masses of plastics |
AU508463B2 (en) * | 1975-07-03 | 1980-03-20 | Bayer Aktiengesellschaft and C-unter Papenmeier KG | Pulverulent rubber mixture |
AT368737B (en) * | 1980-07-31 | 1982-11-10 | Oesterr Schiffswerften | DEVICE FOR PROCESSING THERMOPLASTIC PLASTIC MATERIAL |
SU1087344A1 (en) * | 1981-02-27 | 1984-04-23 | Предприятие П/Я Г-6594 | Method of producing granulated polyvinylchloride plastic |
DE3475283D1 (en) * | 1983-10-17 | 1988-12-29 | Renato Fornasero | Process for recovery of heterogeneous waste plastic materials, and apparatus usable in carrying out the same |
GB2190006B (en) * | 1986-04-26 | 1990-01-04 | Farrel Bridge Ltd | Control for batch mixers |
-
1991
- 1991-04-16 IT IT91TO288 patent/IT1245070B/en active IP Right Grant
-
1992
- 1992-04-07 FR FR9204244A patent/FR2675422B1/en not_active Expired - Fee Related
- 1992-04-07 GR GR920100136A patent/GR1001132B/en not_active IP Right Cessation
- 1992-04-08 PL PL92297188A patent/PL169931B1/en unknown
- 1992-04-08 DK DK92907183T patent/DK0539534T3/en active
- 1992-04-08 JP JP92506802A patent/JPH05508122A/en active Pending
- 1992-04-08 KR KR1019920702946A patent/KR100216084B1/en not_active IP Right Cessation
- 1992-04-08 AT AT92907183T patent/ATE171101T1/en not_active IP Right Cessation
- 1992-04-08 DE DE19924291173 patent/DE4291173T1/en not_active Withdrawn
- 1992-04-08 HU HU9203620A patent/HU215792B/en not_active IP Right Cessation
- 1992-04-08 EP EP19920907183 patent/EP0539534B2/en not_active Expired - Lifetime
- 1992-04-08 RU RU92016612A patent/RU2118931C1/en active
- 1992-04-08 RO RO92-01553A patent/RO110133B1/en unknown
- 1992-04-08 BR BR9205235A patent/BR9205235A/en not_active IP Right Cessation
- 1992-04-08 ES ES9250050A patent/ES2085201B1/en not_active Expired - Fee Related
- 1992-04-08 CH CH03880/92A patent/CH688276A5/en not_active IP Right Cessation
- 1992-04-08 GB GB9224822A patent/GB2260329B/en not_active Expired - Fee Related
- 1992-04-08 ES ES92907183T patent/ES2124254T5/en not_active Expired - Lifetime
- 1992-04-08 AU AU14348/92A patent/AU653011B2/en not_active Ceased
- 1992-04-08 DE DE69227004T patent/DE69227004T2/en not_active Expired - Fee Related
- 1992-04-08 NL NL9220001A patent/NL9220001A/en not_active Application Discontinuation
- 1992-04-08 WO PCT/CH1992/000064 patent/WO1992018310A1/en not_active IP Right Cessation
- 1992-04-08 CA CA 2085236 patent/CA2085236C/en not_active Expired - Lifetime
- 1992-04-10 IL IL10156392A patent/IL101563A/en not_active IP Right Cessation
- 1992-04-10 UY UY23401A patent/UY23401A1/en not_active IP Right Cessation
- 1992-04-13 DZ DZ920037A patent/DZ1571A1/en active
- 1992-04-14 NZ NZ242352A patent/NZ242352A/en unknown
- 1992-04-14 BE BE9200334A patent/BE1005779A4/en active
- 1992-04-14 PT PT100385A patent/PT100385B/en active IP Right Grant
- 1992-04-15 MX MX9201792A patent/MX9201792A/en unknown
- 1992-04-15 AU AU16572/92A patent/AU1657292A/en not_active Abandoned
- 1992-04-15 IE IE921207A patent/IE81027B1/en not_active IP Right Cessation
- 1992-04-15 WO PCT/IT1992/000044 patent/WO1992018312A1/en active Application Filing
- 1992-04-15 EG EG20092A patent/EG19667A/en active
- 1992-04-15 TN TNSN92031 patent/TNSN92031A1/en unknown
- 1992-04-16 CN CN92102678A patent/CN1063700C/en not_active Expired - Fee Related
- 1992-04-16 IL IL101621A patent/IL101621A0/en unknown
- 1992-04-16 CN CN92103688A patent/CN1067844A/en active Pending
- 1992-04-16 YU YU39792A patent/YU48287B/en unknown
- 1992-04-16 ZA ZA922833A patent/ZA922833B/en unknown
- 1992-09-24 HR HRP920449 patent/HRP920449B1/en not_active IP Right Cessation
- 1992-11-27 SE SE9203578A patent/SE508021C2/en not_active IP Right Cessation
- 1992-11-30 FI FI925446A patent/FI925446A/en unknown
- 1992-12-01 NO NO19924633A patent/NO310281B1/en not_active IP Right Cessation
- 1992-12-09 LU LU88199A patent/LU88199A1/en unknown
- 1992-12-14 BG BG97167A patent/BG61833B1/en unknown
- 1992-12-16 DK DK199201504A patent/DK173548B1/en not_active IP Right Cessation
- 1992-12-16 OA OA60317A patent/OA09799A/en unknown
Also Published As
Similar Documents
Publication | Publication Date | Title |
---|---|---|
IE81027B1 (en) | A process for transforming a starting material containing at least two different thermoplastic materials into a new homogeneous thermoplastic material | |
US5945479A (en) | Process for transforming a starting material containing at least two different thermoplastic materials into a homogeneous thermoplastic material | |
US7842221B2 (en) | Process and apparatus for the production of filled thermoplastic polymers | |
US4222728A (en) | Apparatus for processing synthetic thermoplastic material | |
CA2715048C (en) | Method and device for injection molding plastic material | |
EP0140846A2 (en) | Process for recovery of heterogeneous waste plastic materials, and apparatus usable in carrying out the same | |
WO2014123432A1 (en) | Small-scale thermoplastic recycling apparatus and method for producing fiber strands for insulation | |
US4003136A (en) | Method for the drying and recovery of polyethylene waste material | |
EP0897783A3 (en) | Recycling process of a cross-linked polymeric material, in particular from electric cable coating materials | |
KR20040091590A (en) | Process and device for the production of elastomer-modified thermoplastics | |
JP4133257B2 (en) | Waste plastic granulation method and granulation apparatus | |
EP0720898B1 (en) | Improvement in the recycling method for the re-use of solid household and similar wastes | |
CA2194811A1 (en) | High intensity mixer | |
JP2005280242A (en) | Waste plastic processing method | |
HU199529B (en) | Method of processing waste plastics, particularly waste of foil type |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
MM4A | Patent lapsed |