Extrusion molding is a process in which a stack of powders is pushed into a die to assume another form or other final product under pressure. This process is also known as plastification extruding, and is used to manufacture pipes, hoses, drinking straws, curtain racks, rods, edgebands, and fibers.
In order to create a long, "tube-like" structure, the granules melt into a liquid and are pushed through a die. The tube's shape is determined by the die's shape. After cooling, the extrusion takes on a solid shape. The tube can be sliced at equal intervals and printed on. The components can either be packed together or rolled up for storage. The optical fiber cable is among extrusion molding's most well-known products. We may say extrusion molding is comparable to injection molding, with the exception that a long continuous shape is produced, to make it simpler to understand.
Extrusion molding is done at low temperatures, typically between 40 and 200 ºC, the cold extruding process is used to remove the green body from mixes of metal powders and organic binders. Preparing the material, preprocessing, extruding, cutting, and reforming are some of the steps.
The characteristics of a material are significantly influenced by plasticizers. As a result, they must meet a number of criteria, including the necessity to be removable, sticky, and to have a high capacity for pore formation during sintering without reacting with porous materials. Olefin, amylum, and polythene alcohol are the most frequently used plasticizers. In addition to the usual compression caused by the extrusion shaft, powders will also experience pressure from the side wall, friction between the powder and the wall, or friction between the extrusion shaft and the wall.
The types of powders, the shape and size of the particle, the type and content of the plasticizer, the accuracy of the mold, the pressure from extrusion, the speed of extrusion, and the preheating temperatures are the main variables impacting the properties of extrusion molding. Depending on the best plastic to use with the chosen plasticizer at the chosen temperature, the preheating temperature is chosen. Experimental analysis can be used to gauge the extrusion speed. Additionally, it has a close connection to the plasticizer, fluidity, extrusion ratio, fluid particle size, and shape. The final piece could crack at faster extrusion molding rates.
