6.PVC Profile Extrusion Line
As the name suggests, extrusion is the process by which molten plastic is forced through a die to form products such as piping, plastic sheeting and other building-products.
To maintain dimensional consistency, all extrusion lines rely on master extrusion controls to regulate the speed of downstream equipment - especially pullers, which gently grip and draw the stream of extrudate from the extruder through tooling, measuring and cooling equipment, then into cutting and hauling off machines.
Control System
The extrusion process can be complex. A variety with jwell 4 gallon bottles blow making machine of factors influence the extrusion process, including feedstock characteristics, processing parameters and machine design.
Variations in the screw revolution cause pressure fluctuations that can impact size & tolerance control. Battenfeld-Cincinnati has developed Steady flow, a system that continuously measures pressure at the screw tip and compensates for differences in pressure during one screw rotation.
The extrusion process also includes back pressure. This pressure is a component of the overall extrusion process, and it affects both profile integrity and physical properties.
Conical Twin Screw Extruder
A conical twin screw extruder is the most common extrusion machine used to produce PVC pipe and profiles. It is a very efficient machine that is capable of producing high-quality and sturdy plastic products such as jwell TPU sheet extruder.
It is also known for being easy to maintain and operate, making it a great choice for the production of PVC pipes and profiles.
A conical twin screw extruder has a number of different parts that work together to ensure that the line operates smoothly. These parts include:
Extrusion Die
Extrusion is a process that transforms a liquid compound (also called resin or plastic) into a solid, usually in the form of tubes, pipes, films, sheets, or overjackets. The resin is gravity fed from a hopper into the barrel of the extruder; additives may be added to improve performance or change properties such as UV absorption, energy reflection, or oxygen permeation resistance.
Once the molten polymer has left the die, it is generally cooled using a water bath. This is because compared to steel, plastic conducts its heat away 2,000 times slower.
Calibration Unit
One of the most critical components of any 6.PVC profile extrusion line is the calibration unit. It has to handle the heat, vacuum, and cooling required to make the complex plastic profiles we see on the market.
Calibrators are typically made up of multiple blocks that are designed to have cooling channels and vacuum. Sometimes they are even built to be slightly warmer than the rest of the tooling to impart a smoother surface to the part.
Haul-off Unit
The PVC profile extrusion line can be used for PVC pipe, plastic window profiles, steel-plastic composite profiles, and decorative profiles. This production line consists of control system, conical twin screw extruder or parallel twin-screw compounding extruder, die head, calibration unit, haul-off unit, cutter, film covering machine and stacker.
The haul-off unit is a key part of the PVC pipe extrusion production line. It can provide the necessary force to pull the pipe through cooling process without affecting the dimension of the pipe. This unit can also provide a constant pulling rate to maintain the proper wall thickness of the finished product.
Film Covering Machine
PVC profile extrusion line is a kind of high-quality production for jwell 160L barrel blow molding machines equipment. It can produce a wide range of plastic door and window profiles, rails, hollow board, decorative profile etc.
It consists of control system, conical twin screw extruder or parallel twin screw extruder, extrusion die, calibration unit, haul off unit, film covering machine and stacker. It has stable Plasticization, high output, low sheering force, long life service and other advantages.
It is equipped with alternating-current inverter (ABB or Eurotherm drive), imported temperature controller (RKC,Japan). The calibration unit's pump and haul off unit are famous brand products.
Stacker
A stacker is a large machine used in bulk material handling with jwell PVC High Speed window Profile Extrusion Line. It carries the raw materials to be piled on a stockpile or reclaimer.
PVC is a thermoplastic resin that is formulated with stabilizers, plasticizers, and colorants. It is then fluxed for a certain amount of time and temperature before it is extruded into a custom profile.
