What is the molding method of profiled sponge?
Author：
Yuanyuan Xiaobian
Edit：
Yuanyuan Xiaobian
Source：
发布日期： 2020-3-2
浏览次数：597
Summary of information：
The molding methods of profiled sponge include extrusion, injection, molding, fusing or bonding, rot...
The molding methods of profiled sponge include extrusion, injection, molding, fusing or bonding, rotational molding, leaching and orientation. The extrusion method can be divided into chemical foaming and physical foaming. Extrusion chemical hairdressing can be divided into direct extrusion foaming and normal pressure heating foaming after extrusion. Injection method can be divided into high pressure method and low pressure method. Moqing's law can be divided into one-step method and two-step method.
In addition to the various molding methods mentioned above, crosslinking is an important aspect in the molding of profiled sponge. Therefore, in the foaming of polyethylene, there are cross-linked foaming and non crosslinking foaming.
There are two crosslinking methods of polyethylene, chemical crosslinking agent crosslinking and radiation crosslinking. There is no significant difference in physical and chemical properties between the two methods. Using chemical crosslinking agent Wenlian is to add organic peroxides to the ingredients and heat them to the high temperature above the melting point of the resin to decompose and cause cross-linking of the resin. This method is not only suitable for continuous production method of extrusion method, but also suitable for batch production method such as molding method, so it is widely used.
However, the reaction residue of crosslinking agent is easy to change color and smell. Radiation crosslinking is to use gamma ray or electron radiation to crosslink polyethylene. It is an important aspect in the industrial application of radiation chemistry.
This method requires a lot of equipment investment, but the surrounding power consumption is less than that of the chemical crosslinking method, and the crosslinking agent is not needed. Therefore, if the production volume is large, the economic value is no less than that of the chemical crosslinking method. Polyethylene can be crosslinked rapidly by a certain dose of radiation, thus simplifying the overall foaming process. However, the thickness of profiled sponge produced by radiation crosslinking is limited.
