，题目是：The Structure of Extruded Products
Extruded products are found in levels, tubes, and hollow shapes that are all produced by shaping molten or plasticized material, such as rubber or plastic, under high pressure. In cylinder form, extruded products can be manufactured, and then cross-sectionally cut to the desired shape. The extrusion process involves the exertion of a quantity of material over a heated die in order to create a continuous cross-section, it takes place when a plastic material is forced through a die, which is normally in the shape of a nozzle, using pressure.
When presented in cylindrical form, extruded products can be machined in order to produce any desired shape. This is done using a combination of hand tools and machines. These tools can be used to create varieties of surface finishes and edges, for example a Milling machine can provide a surface finish which is more precise and easier to produce than that of a hand tool.
The extrusion process is suited to produce items in various sizes and lengths, and the finishes generated can include a range of impacts. These impacts include, hardness, strength, surface texture and durability.
The structure of extruded products is dependent on the material used, and the specific needs of the client. Some of the more common materials used in the extrusion process are rubbers and plastics, and generally the client will have specific requirements for their product.
The pressure used in the extrusion process is a very significant factor in the products structure. The increased pressure will result in increased densification, meaning that larger extruded products will be denser. Generally, the pressure used in profession-specific extrusion processes ranges from 40 to 600 MPa.
The type of extrusion process used will also affect the structure of the product. Cold extrusion operates at room temperature and results in a finished product with a low internal surface area, while Hot extrusion operates under higher pressure and temperatures, resulting in a product with a wide internal surface area.
The extrusion process is complex, and has many different attributes that can be manipulated to create the desired structure. This includes changes in pressure, temperature, speed, and die design.
Although the majority of extrusion processes involve a single, continuous piece of material, there are multiple occasions where multiple pieces of material are often combined. For example, the extrusion of a multi-layer mat can be used to create final product, the Internal structure of the mat itself is dependent on layering different materials, for example rubber and fiber array, with controlled parameters.
In summary, the structure of extruded products are very much dependent on the materials used and the specific requirements of the client. The pressure, temperature, speed, and die design of the extrusion process all result in differences in the density and structure of the final product. Additionally, in some circumstances, a combination of different materials may be used in order to produce a multi-layer extruded product with a complex internal structure.
