RU116402U1 - DEVICE FOR PROCESSING THERMOPLASTES - Google Patents

Abstract

A device for the processing of thermoplastics, containing a technological chain in which a shredder, a washing and drying complex, a feed hopper, an extruder unit, a storage hopper and means for transferring the processed material between the mechanisms of the technological chain are sequentially installed, characterized in that it contains an additional technological chain, including a shredder, a washing and drying complex and a hopper-feeder, while the outputs of the hoppers-feeders of both technological chains are connected to the extruder through dispensers, in addition, the extruder is configured to input the finished raw material component by weight.

Description

The utility model relates to plants for the processing of polymeric materials and can be used for the processing of thermoplastic plastic waste by extrusion.

The processing of polymers will improve the ecological situation as a whole, since packaging made of synthetic polymers practically does not decompose under natural conditions, and when burned emits poisons such as dioxins and furans.

A device for processing thermoplastics is known, containing a grinder, washer, tank, hopper feeder, extruder, filter, perforated head, cutting mechanism, and storage hopper (see description of the waste recycling line for thermoplastics LPOT-2, manufactured by Plastmodern-Mach "Http: //www.equipnet/ru).

The disadvantage of this technical solution is the limited scope due to the impossibility of modifying foundry thermoplastics to give them physical and mechanical characteristics corresponding to extrusion thermoplastics.

As the closest analogue, a device has been adopted for processing thermoplastics containing a processing chain in which a grinder, a washing and drying complex, a feed hopper, an extruder assembly, a storage hopper and means for transferring the processed material between the mechanisms of the processing chain are installed (see RU patent No. 98971, IPC В29В 17/00, В29В 9/00, publication date 10.11.2010).

The disadvantages of the closest analogue can be specified in a limited scope, since it allows you to modify only foundry thermoplastics.

The objective of the utility model is to enable the modification of secondary low-pressure polyethylene of extrusion or injection grades.

The technical result achieved in solving the problem is expressed in expanding the scope due to the possibility of modifying secondary low-pressure polyethylene of extrusion or injection grades.

The problem is solved in that a device for processing thermoplastics containing a technological chain in which a grinder, a washing and drying complex, a feed hopper, an extruder assembly, a storage hopper and means for transferring the processed material between the mechanisms of the processing chain are installed, characterized in that contains an additional technological chain, including a chopper, a washing and drying complex and a hopper-feeder, while the outputs of the hoppers-feeders of both technological chains are connected to the extruder through dispensers, in addition, the extruder is configured to enter the finished raw material component by weight.

The claimed utility model is illustrated in the figure, where figure 1 shows a diagram of the device.

The drawing shows shredders 1, washing and drying complexes 2, hoppers-feeders 3 connected to the extruder assembly 4 through batchers 5, hopper-hopper 6 and means of transfer of the processed material (not shown).

As crushers 1 for extrusion grade polyethylene, rotary crushers of the Tornado S series of the corresponding capacity can be used for grinding lightweight plastic waste products: polystyrene foam, PET bottles, small and medium casting waste, films.

For processing recycled polyethylene of injection molded grades, one of the grinders 1 can be used with the 11-kW AV series tearing shredder for pre-processing and grinding of bulky waste from HDPE, LDPE, PP, ABS, as well as heavy extrusion and lithium waste.

As washing and drying complexes 2, you can use well-known water-washing plants (for example, economy-class washing and drying complexes MSC developed by the Nazarov-Systems Design Bureau) designed for washing and drying shredded highly contaminated (including landfill) wastes of any types of thermoplastics with a productivity of 300 or more up to 800 kg / hour. Also, as washing and drying complexes 2, you can use the well-known DRD dry-washing plants (manufactured by MAS Maschinen und Anlagenbau Schulz (Austria), with a productivity of 500 and 1000 kg / h. The parameters and time of the washing cycle depend on the material being processed and are adjusted by the operator depending on from the required cleanliness and performance. Dry washing occurs due to a combination of mechanical and thermal processing of the material.

The hopper feeder 3 is not structurally different from nodes of a similar functional purpose.

The extruder assembly 4 comprises an extruder, a filter, a perforated die and a cutting mechanism.

To obtain a homogeneous melt, a single-screw or twin-screw extruder is used, the productivity of which corresponds to the design capacity of the line. The cylinder and screw of the extruder take up the main load in the processing of polymer waste, for this reason they are made of alloyed wear-resistant steels (# 45, 38CrMoA1A) and are additionally processed by quenching, nitriding, hard chrome plating. Surfaces are polished.

The perforated head, the so-called strand head, provides filaments (strands) at the exit of the extruder, the destruction of which form granules.

The cutting mechanism can realize the principle of cutting granules directly at the exit of the extruder head with further pneumatic transportation to the storage hopper, or hot cutting with water cooling and transportation.

The claimed device operates as follows.

Raw materials in the form of primary and secondary polyethylene are simultaneously fed into the grinders 1, from where, after grinding to a predetermined size, by means of transfer means in the form of screw conveyors (not shown in the drawing) enter the washing and drying complexes 2. Then, the crushed and clean polymer raw materials enter the hoppers- feeders 3, from where it is fed through the batchers 5 to the extruder assembly 4, where it is melted and mixed in the extruder, forming a homogeneous melt, the temperature of which is close to the temperature of polymer destruction. From the extruder, the melt, purified from mechanical impurities on the filter, is squeezed out through a perforated head with the formation of threads (strands). These threads by means of a cutting mechanism are divided into granules.

The granules obtained in the processing process at the claimed plant are distinguished by good consumer properties - melt density and fluidity. Next, the granules from the storage hopper 6 are sent for packaging, where they are packaged in a known manner in appropriate containers (bags, soft containers, etc.).

Thus, the claimed device for processing thermoplastics allows you to expand the scope due to the possibility of modifying secondary low-pressure polyethylene extrusion grades.

Claims (1)

A device for processing thermoplastics containing a processing chain in which a chopper, a washing and drying complex, a hopper-feeder, an extruder assembly, a storage hopper and means for transferring the processed material between the mechanisms of the technological chain are installed, characterized in that it contains an additional technological chain, including chopper, washing-drying complex and hopper-feeder, while the outputs of the hopper-feeders of both process chains are connected to the extruder through d ozators, in addition, the extruder is configured to enter the finished raw material component by weight.