JPS59212218A - Recovery facility for polluted polyolefin plastic material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recovery facility for contaminated polyolefin plastic materials, particularly plates and films, and provides significant advantages over known recovery facilities.

The equipment is preferably equipped with pre-grinding rolls for grinding the plastics material to be recovered, the grinding rolls being connected to a silo device with a metering device, the metering device being a supply of the crushed material. connected to the device.

Contaminated plastic boards and films processed in recovery facilities usually come from paper and scrap merchants, in particular from general plastics recovery companies, and are usually delivered in pressed packaging.

The material generally consists of polyethylene bags, which contain animal feed, fertilizers, salts and all kinds of chemicals and food products.

Each such bag or package contains one dirty board of previously palletized shrunken polyethylene bundles. Also, dirty boards or films used for greenhouse covers, bags of various sizes discarded after being used for packaging various products, as well as plastic containers and dirty plastics from household and industrial waste. , we also ship used polyolefins and other boards and films of all types, so those shipments include any remaining packaging or product, labels, paper, adhesives and/or strings they may have contained. and there is always some dirt, i.e. dirt, to be cleaned.

The known equipment has various drawbacks. This is because, on the one hand, the known equipment does not satisfactorily solve the cleaning problem, especially when the plates or films are substantially thin;
Also, on the other hand, it is not possible to separate polyolefins (especially polyethylene and polypropylene) from other Noris snacks such as polyvinyl chloride.

The purpose of the present invention is to overcome the above-mentioned drawbacks and, therefore, to provide equipment that can obtain only polyolefin plastics to the exclusion of other Norisnacks (including plate-shaped polyvinyl chloride), and furthermore, The plastic material recovered by the facility is free of contaminants and forms a homogeneous mass ready for industrial use.

This objective is achieved with installation I4, which consists of the equipment described below. That is, the first washing and density selection device consists of two containers communicating with each other, which are used to hold the washing liquid, and are equipped with a device at the bottom for removing municipal waste to the outside. , the first container is used to continuously contain the crushed plastic material and is divided into a plurality of successively arranged compartments, and forms a labyrinth passage for the recovered plastic material. separated from each other by groups of walls, an agitation device is disposed in the compartment and is used to generate a flow in the cleaning liquid and cause strong agitation to scrape the material submerged in the cleaning liquid; The last compartment has a lower communication passage with a second container used for the passage of plastic material, and the vane is installed in a continuous parallel transverse axis at the upper end of said second container and opposite the artificial end of the container. A longitudinal deflector is used to move the floating plastic material towards the end, with a longitudinal lateral baffle at the lower end of the container acting as a breakwater and having a passage in its middle communicating with the first container. It acts as a device used to create a fluid circuit and to collect the floating plastic material and convey it to a hopper communicating with a continuous ramp feeder, which feeds the plastic material into a used to lift the plastic material during discharge to a second washing and density selection device, said second device being quadruple walled in at least one first tank and partially submerged within said tank; The draining, drying and/or
Or, it is used to hold the cleaning liquid collected by the collection device for plastic material recovery which is connected to the molding equipment, and the bottom of the two tanks has a control tank for the liquid, contaminants and waste, respectively. There is a possible exit.

According to the invention, it is advantageous that in the first washing and density selection device, the agitation device of the first container is constituted by a shaft with blades forming a propeller and a tube in its trench. The tubes are adjustable in place and include adjustable internal fins. The device for discharging heavy waste to the outside consists of at least one conveyor worm for each container, with half of the conveyor worms of the second container having a right-hand twist, half a left-hand twist, and a conveyor worm in the middle. The lower receptacle has a section, each valve located at its inlet and outlet for collecting waste carried by each half of the worm and discharging those wastes without substantially discharging liquid from the container. The floating plastic material collection device, which is used for this purpose and is disposed in the second container, consists of a continuous packet elevator with perforated packets.

In a particularly advantageous embodiment of the invention, the second washing and density selection device is continuous with the first tank and consists of - or more tanks, each communicating with the previous one at its upper end; There is also a flotation tank, each equipped with a feeding device similar to that of the first tank, and connected to the last tank in series and communicating with the flotation tank, which is connected to each of said tanks. The selection tank is equipped with a series of vanes similar to those of the first cleaning and density selection device.

In the second washing and density selection device it is advantageous to
A continuous ramp feed device is in communication with the first device and has at least one adjustable additional liquid inlet and at least one adjustable liquid outlet at a lower level, and a continuous slope feed device is in communication with the first device and has at least one adjustable additional liquid inlet and at least one adjustable liquid outlet at a lower level, and has They are connected by two opposing tubes located on the same horizontal plane, which tubes extend separately from the end of one tank in relation to the immediately adjacent tank, and which passes around the exterior of the tank and extends into the two areas of said directly adjacent tanks, so that the liquid level in all tanks and in the flotation tank adjacent to the last tank. the lower outlet of the two tanks is in communication with a compressed air supply device used for blockage prevention and communicating with the evacuation device, and at least one adjustable The population of clean liquid is contained in the second purification and density selection device, and the collection device for plastic material recovery located in the floating 1"N tank does not move the liquid substantially. The inside of the conveyor consists of fi't.

In the present embodiment, the discharge device is used to receive the plastin material from the flotation tank through the pipe by vehicle power, and consists of a press mechanism, centrifugal mechanism, shaker and other 1N-cut discharge mechanism, and equipment used to convey the separated plastic side material to the storage silo, equipment used to convey the liquid from the discharge device to the first container in the first washing and density 1 storage location, and the equipment used to convey the plastic material from the silo. It includes at least one conveyor used for conveying to the drying equipment.

In yet another embodiment of the invention, the drying device comprises at least one rotatable inclined tube with internal fins, the lower end of which communicates with the hot air generator. , the upper end of which is connected to a suction device used to receive the plastic material to be dried and which communicates with the cyclone collector of the residue, the lower end forming an outlet path for the dried plastic material. and is equipped with a conveyor worm for conveying the paulownia wood to a conveyor device, a cyclone tanning device and a final storage silo for recovered plastic material.

In addition to the advantages already mentioned, the invention has the following advantages compared to known installations.

The raw material throughput is higher and the industrial volume is higher.

Less labor per unit weight of product obtained.

The recovered product is cleaner and of better quality and can be reused in film production.

Must be energy efficient.

Capable of processing very thin films.

The cost per unit weight of the final product is lower.

In order to facilitate the understanding of the foregoing description, and at the same time to disclose the benefits in detail, non-limiting embodiments will now be described with reference to the accompanying drawings.

Grinding equipment for preliminary grinding of the glass material to be recovered (
(not shown) is connected to a receiving silo from a flexible conveyor (e.g. air conveyor) for the use of crushed contaminated plastics, which is equipped with a weighing device, a vibrating device and a lower taper. An outlet is provided for discharging said crushed contaminated plastic material to a feeding device such as a conveyor worm 2.

The crushed plastic material is transferred to the first compartment 3' of the first container 3 of the first cleaning and density selection device by means of the conveyor worm along the flow direction of the product being processed.
Continuously discharged. Said first cleaning and density selection device consists of said container and a second container 9, both containers communicating with each other at their lower part 8 and middle part 11, at the bottom of which heavy soils and other wastes can be stored. Device for removing objects to the outside 4
It is equipped with ゜13.14.

The first container 3 is divided into a plurality of compartments 3', in the illustrated embodiment a large compartment, in a continuous arrangement (with respect to the process material passage) and separated from each other by at least one pair of walls or partitions, which walls Alternatively, the partitions may be opposed at different heights and may include labyrinths to allow circulation of the plastic material during processing.

Each compartment 3' has an agitation device 6, preferably vertically arranged, suitably driven (by means of a transmission and one or more electric motors and optionally equipped with a speed change meter) to produce a flow in the cleaning liquid.
The agitation device includes a shaft 6' and a plurality of superimposed spaced propeller blades and propellers forming a propeller σ' with adjustable height and, if required, a horizontal tube 7. The tubes are provided with internally inclined fins (not shown), for example, each tube is provided with three fins.

The rotation of the propeller 6'' causes a strong flow of liquid (which may also be water) in each compartment 8', causing a swirling of the liquid and forcing the liquid into the tube 7 and at the same time pushing the material along the tube. The impact of the plastic material against the internal walls and fins of the propeller and tube strongly agitates and rubs the material submerged in the liquid, extracting heavy non-suspended contaminants such as stones, soil and other particles7. It is deposited on the bottom of the container 3 and removed by the conveyor worm 4.

The terminal compartment 3'' is equipped with a passageway 8, which communicates at its lower end with a second container 9, through which the plastic paulownia wood being treated is contained. This plastic material has a lower density than water and therefore floats to the surface of the liquid in the container 9.The density selection is determined by the corresponding transmission. The tool 111 is lateral to a group of vanes 10 mounted on a continuous parallel transverse shaft 10' driven by at least one pump, a motive force and a speed change meter, so that the plastic material is advanced very slowly. Thus, the floating plastic material moves to the XM of the container 9 opposite the inlet end 1 and slowly moves opposite KT.
When the iill is reached, most of the heaviest foreign objects therein, or at least some of the plastic materials other than polyolefins, are gone.

In order to achieve the minimum disturbance and maximum tranquility of the final liquid necessary for a good density selection of the material being processed, the second container 9 forms a part of the iron grate that fits into the bottom passage and provides a breakwater. A deflector plate 12 that intersects vertically and horizontally is provided at the lower part (up to a height where the movement of the plastic material does not become a hindrance). A communication section 1 is provided between the containers 9 and 3 on the baffle plate.
1 to create a fluid circuit and ensure that the liquid continues to flow back into the first container 3.

Below the baffle plate 12, at the bottom of the container 9, a conveyor worm extends its entire length, one half to the right and the other half to the left. ν[', where both halves of the worm settle and a receiver located intermediately below the conveyor worm, driven by an electric motor and an optional speed change meter, carries the waste foreign matter so that it is removed towards section 14. Process. The receiving section 14 is equipped with two solenoid valve devices 15 and 16, the former at the inlet and the latter at the outlet, the pulp device being adjusted so that the former is placed on the conveyor worm +3VC as described above. The line-of-line lunin valve device 16, which opens for the purpose of evacuation of waste, becomes one step closed, and vice versa.

In this way, the waste is discharged to the outside without substantial loss of liquid within the container 9.

A timer, regulated by the amount of waste removed from the receiver, can be used to control the opening and closing times of the valve fittings #15 and 16.

At the end of the passage of plastic material floating in the container 9,
There is a circulating packet chain with perforated packets that collects and conveys the material to hopper 18 and discharges the conveying core material. The hopper 18 is in communication with a continuous operation feeding device which is inclined and becomes a hoisting device such as a conveyor worm 19 such that the plastic material is lifted from the hopper 18 and onto the top of a second washing and density selection device 20. Precisely, it is also continuously discharged into the upper end of the feed device 24, which is oriented vertically and downwards.

During incline travel, the plastic material is continuously discharged, the incline feeding device having at least one adjustable inlet for additional liquid (for cleaning) and at least one adjustable inlet on the lower side. Although there is a liquid outlet, both the input and output ports are not shown in the drawings.

? ! -m packet wheel 17 may be replaced by any other suitable device for collecting and conveying plastic material to the ramp continuous lift feeder.

The second cleaning and density selection device 20 is comprised of a first tank 21 and a second tank 22, the first tank having a substantially cylindrical shape with a reverse taper at the bottom; A feeding device 2 whose walls are continuously directed vertically downwards.
4, the feeding device being in this case a conveyor worm having an enclosing wall and partially submerged in said tank, the second tank communicating with said first tank at its top end. It has a similar shape and has the same feeding device 25 as the feeding device 24 in the same position. Both tanks are connected by two pipes 21' (located behind the tank from the viewer's point of view and shown in phantom in the figure), which are opposite each other and lie in the same plane. Located in
It extends away from the tank 22 and separates from the end 21' of the tank 21, surrounds the tank 21, and appears in three areas 22' of the tank 22, thereby automatically defining the liquid levels in both tanks and the flotation tank 23. . The second device 20 also consists of said flotation tank 23, which forms a body connected and in communication with the tank 22, for example extending as an extension of the tank 22, which flotation tank 23 is tank 21 and 22
a series of vanes 26 and 26' disposed at the surface of the liquid, such as a substantially liquid-unobstructed packet wheel with a perforated packet and a suitable drive device (not shown); The flotation plastic collection device 27 is relatively slow (epsilon can use a worm instead of a packet wheel), is located next to the end of the flotation tank away from the tank 22, and collects the plastic material by Discharge, dry, and exhale into forming equipment as required.

Tanks 21 and 22 are provided at their bottoms with control outlets 28 and 28', respectively, for liquid and sediment collected during processing. Overall, the water and liquids must be as clean as possible to obtain the highest quality final product, so it is imperative that they be continually refreshed, and that a suitable amount is removed from the bottom of the tank along with the accumulated silt. through lines 29 and 29' to a discharge device 30 on an inclined plate, which may be a fine wire mesh, perforated plate, or iron grate (mechanically operable if desired), where the liquid is discharged from foreign objects, plastics other than polyolefins, and It is separated from the silt, removed from the waste 30 and discharged through a filtered liquid sump L. The flow t of the discharged liquid is e.g.
Supplemented with an equivalent amount of cleaning liquid pumped through, other liquid inlets can be used if required. The discharged liquid can be completely removed or purified for recirculation within the facility. In order to prevent possible obstructions by foreign objects in the path of the dirty liquid through the pipes 29 and 19', each outlet 28 and 28' can be provided with periodic assistance (manual or automatic) to clean the pipes and avoid obstructions. There is a compressed air device 31.

The plastic material discharged by the conveyor worm 19 in the conveyor worm 24 of the tank 21 is lowered by the conveyor worm 24 towards the bottom of the tank in a reed where the material is slowly and freely discharged;
The liquid enters the tank 21 with little movement and then, because the material is even less dense, gradually rises on a free surface and from there is carried by the vanes 26 to the conveyor worm of the tank 22. Collected by 25, same 4
As the ψ operation is repeated, the plastic material descends to the lower part of the conveyor worm 25 and is discharged to the lower part of the tank 22, from where it rises on the free surface 1 of the liquid and is transferred to the flotation tank by means of vanes 26'. It is slowly washed away over the entire length of 23.

Conveyor worms 24 and 25 and tanks 21 and 22
During the sliding movement along the vanes 26 and 26', the plastic material releases denser foreign objects (including plastics other than polyolefins) that are suspended or stuck to the liquid. , the object descends to the bottom of tanks 21 and 22 and is removed like a target through outlets 2 and 28'.

The plastic material becomes increasingly clean as it passes through the tanks 21 and 22, and as the vanes 26' sweep it across the surface of the flotation tank 23 with little movement of the liquid, residues and other particulates are separated from the plastic material. and are sequentially deposited on the sloping bottom of the flotation tank.

When the plastic material reaches its final stage via the flotation tank 23, it is collected by the perforated bagut (for liquid drainage) of the circulating bagut wheel 27. The movement of this part of the equipment is gradual to facilitate density selection operations in the flotation bath and to allow the last particles to be deposited at the bottom of the flotation tank as the liquid moves.

The clean and selected plastic material is deposited in a funnel connected to the pipe 32' by the circulating bagut chain 27 of the ventilator, the material sliding along said pipe by gravity. We arrive at the ejection device, which in this embodiment is a press 32 (the ejection device can be a centrifuge or any other suitable ejection device).
The separated liquid is returned to the container 3 by a device not shown, and the container includes a weir to maintain a constant liquid level necessary for the first washing, and the liquid is supplied from the press 32. Single-wash and density selector fluids, which are relatively the most contaminated in the equipment, are kept clean. The liquid phase squeezed out by the press 32 can be recycled at the opening 30. After drainage, the plastic material is transported by a conveyor worm 33 to a storage dryer 34 and from there to a dryer by a conveyor 35, although in this embodiment (only the one closest to the viewer is shown in this figure). (as shown) a rotary tube 36 with an internal fin of about 1 m.
There are 1 shi. Hot air is generated by a hot air generator 39 driven by an electric fan 38 and blown into the outlet end of the tube 36 by means of the container tube 37 . The discharge end of the single fan is divided into two tubes 37. The upper or inlet end of the tube 36 is connected to a suction device 40 to remove moisture from the hot plastic material and prevent residues or residues of the crushed product from being deposited in the cyclone collector 41 .

The clean, selected, and dry plastic material is collected by a conveyor worm 42 at the outlet end of the tube 36 and further conveyed to a fan freeze or conveyor, from where it is
Conveyed via pipe 43 to a cyclone deposit, the recovered plastic material is fed on demand to a final storage silo device or to a forming or agglomeration device 45.

[Brief explanation of the drawing]

Figure 1a is a schematic elevational view of the equipment from the receiving side silo device to the discharge device; 2 is a schematic plan view of the cleaning and density selection device; FIG. 3 is a schematic sectional view of the device of FIG. 2; and FIG. 4 is a sectional view taken along line IV-TV in FIG. 3...First container 3'...Dividing room 3...Last compartment 4... Main waste removal device 5...
...Wall 6...Stirring device 6'...4Q! + 6・・・・・・・・・Propeller 7・・・・・・・・・Pipe 8・・・・・・Lower communication path 9・・・・・・Second container IO ...Blade 10'...Continuous parallel horizontal axis 11...1 City passage 12...Longitudinal lateral deflector plate 13,14...
...heavy waste removal device 15.16...valve 17...device for collecting floating plastic materials 18...hopper 19...continuous slope Supply device 20...Second cleaning and density selection device 21.22
...Tank 21...Pipe 23...Flotation tank 24...Continuous vertical supply device 25...
. . . Feeding device 26. 26 . . . Vane 27 . . . Collection device 28. 28 . . . Adjustable lower outlet of the tank 30 ......Discharge device 31...Compressed air supply device 32...
...Discharge device 32...Pipe 33...Discharge stick material transport device 34...Storage silo 35. ......Conveyor 36...Drying device 39...Hot air generator 40...Suction device 41... ...Cyclone collector 42...
...... Conveyor worm 44 ...... Cyclone tank 45 ...... Molding device

Claims (6)

[Claims] (1) Equipment for the recovery of contaminated polyolefin plastic materials, in particular plates and films, with a pre-grinding device for the plastic material to be recovered, consisting of two containers 3°9 in communication with each other for containing the cleaning liquid. At the bottom there are respective devices 4, 13 for removing heavy waste to the outside.
14 and a first container 3 for continuous storage of the pulverized plastic material is divided into a plurality of compartments 3', 3'' in a continuous arrangement for the plastic material to be recovered. Wall 5 forming a labyrinth passage
and that the partition chambers 3', 3 are separated from each other by
A stirring device 6 is disposed in the cleaning liquid to create a flow in the cleaning liquid and perform strong stirring to scrape the material submerged in the cleaning liquid, and the last partition 3'' is made of plastic material. having a lower communicating passage 8 with a second container 9 for passage and vanes 10 at the upper end of the second container 9 for the movement of floating plastic material towards the end opposite the inlet end of the container 9; It is installed on a continuous parallel horizontal axis 10', and there is a horizontal deflector plate 12 as a breakwater at the lower end of the container 9, and a communication path 11 with the first container 3 for creating a fluid circuit in the middle part is floating. There is a device 17 for collecting the plastic material and conveying it to a hopper 18 communicating with a continuous inclined feed device 19, which feed device discharges the plastic material to a second washing and density selection device 20 and a discharge field. during which the plastic material is being pulled up, and the second device has a continuous vertical feeding device 24 which is a wall surrounded by at least one first tank 21 and partially submerged within the tank. by means of a series of vanes 26 similar to the series of vanes of the first cleaning and density selection device located at the upper end of the tank, and by means of a discharge device 32.
, a wash/41G collected by a collecting device 27 for the recovery of plastics material, which is in communication with a drying device 36 and/or a forming device 45, two tanks 21, 22 respectively containing liquid and contaminants. and an adjustable outlet 28 for waste, 2t. (2) Said first washing and density selection device, in which the stirring device 6 of the first container 3 is equipped with blades forming a propeller 6''!1ml 6' and its 1゜long tube 7; the tubes are adjustable in place and have adjustable internal fins 111i, and a device for discharging heavy waste to the outside is provided for each container 3, 9 at least One competition't'17t-m4,
The conveyor Y worm 13 of the second container 9 is half right-handed and half is left-handed, and there is a lower receiver part 14 in the middle part, which is arranged at the inlet and outlet of the conveyor Y worm 13. Each valve 15 and 16 collects the waste carried by each half of the worm and drains the waste from the container. The device of the patent claim is characterized in that the device for collecting floating plastic material, which is discharged without discharging and which is disposed in the second container 9, is constituted by a continuous bagut elevator device 17 with a perforated baglad. Equipment for recovering contaminated polyolefin plastic materials according to scope 1. (3) The second cleaning and density selection device 2o is continuous with the first tank 21 and consists of one or more tanks 22, each of which communicates with the previous tank at its upper end. It is equipped with a feeding device 25 similar to the feeding device 24 of the first tank 21, and also has a flotation tank 23 connected to and in communication with the last tank in the series. Equipment for the recovery of contaminated polyolefin plastic material according to claim 1, characterized in that each flotation tank is equipped with a series of vanes 26, 26' similar to the vanes of the first cleaning and density selection device. . (4) said second washing and density selection device 2o, in which a continuous gradient feed device 19 is in communication with the first washing and density selection device and has at least one adjustable additional liquid inlet; at least one adjustable liquid outlet at one position, the two tanks being in communication with each other by two opposing tubes 21' located on the same horizontal plane, one limb being extending separately from the end of the tank 21 in relation to the immediately adjacent tank 22 and passing around the exterior of the tank 21 and extending into two areas of the immediately adjacent tank, so that all the tanks 21 .22 and the liquid level in the flotation tank 23 adjacent to the last tank is automatically set 5, and the two tanks have their adjustable lower outlets 28, 28' to prevent blockages. A compressed air supply device 3 that is used for and communicates with the discharge device 30
There is at least one adjustable cleaning liquid inlet in the second washing and density selection device 20 in communication with the flotation tank 23, in which a collection device 27 for plastic material recovery is installed. The present invention is characterized in that it constitutes a conveyor device that does not substantially move liquid.
A recovery facility for contaminated polyolefin plastic materials according to claim 1 or 3. (5) The discharge device 32 receives the plastic material from the flotation tank 23 through the pipe 32' by gravity, and constitutes a press mechanism, centrifugation mechanism or other suitable discharge mechanism, and stores the discharged plastic material in a storage silo. 34, a conveying device 33 for the liquid from the discharge mechanism to the first container 3 of the first washing and density selection device and at least one conveyor 35 for conveying the plastic material from the silo 34 to the drying device 36. An equipment for recovering contaminated polyolefin plastic materials according to claim 1, characterized in that the equipment comprises: (6) The drying device is composed of at least one rotatable inclined tube 36 having a fin-like part inside, and the lower end of the limb communicates with a hot air generating device 39 to receive the plastic material to be dried. The upper end of the limb is connected to a suction device 40 communicating with a cyclone collector 41 of the residue, said lower end forming an outlet for the dry plastic material, and a cyclone tank for conveying said material to a conveyor. 44. A facility for recovering contaminated polyolefin plastic material according to claim 1, characterized in that it is equipped with a molding device 45 and a final storage silo for the recovered plastic material.