Foamed silicone tube main production technology

Basic understanding of the three main processes of foamed silicone tube:
1.conventional foaming process: can be unlimited length according to customer requirements sanctions cut length, the foam density is the most extensive, can be produced from 0.3 to 1.0, there are no special requirements, can also be customized according to customer requirements special foam silicone tube. For example: flame retardant, high temperature resistance, etc., but it also has disadvantages, that is, in the long production process of infinite length of time will have some impact on the inner diameter of the product, will be deformed, the inner hole is not round enough, the size will be deviated, such foaming process requires talc, and the bottom of the product is often less talc sticky, will fall in the baking path sulfur, resulting in a very slight belt mark at the bottom.

2.Oil foaming process: This process does not need to go through talcum powder, but directly filter a layer of oily substances after extrusion from the head, because there is no need for talcum powder, so naturally there will be no belt marks this situation, foam silicone tube out of the oily substance after filtering once, immediately into the baking channel sulfur, but this kind of process for product density requirements are higher, generally controlled above 0.5, The foaming density should not be too low, and such foaming process can meet the requirements of FDA food grade certification, and a variety of secondary processing processes can also be carried out, such as: Grinding, chamfering, screen printing, radium carving, etc., its disadvantage is that it can not produce infinite length, because there are oily substances in the inner tube after oil, and the temperature is higher in the baking channel sulfur, the oily substances will form water vapor bonding on the inner wall of the foam silicone tube can not volatilize (silicone is closed cell foam seal) and form high temperature fog. Therefore, generally in the production of 3 to 5 meters, you need to cut a section, so that its volatilization fog dispersed, so you can not do unlimited length, another is in the production of 3 to 5 meters, you need to cut a section, its scrap rate is very high, which leads to the price of the oil foaming process is relatively high (1. High density, 2. High scrap rate, 3. Secondary processing processes), the representative products are foam silicone sleeve, bicycle silicone sleeve, fitness equipment silicone sleeve and so on.

3.Mandlet foaming process: this is a more special foaming process, the surface is very smooth and round, but the application field is relatively fixed, and it is mostly used in the appearance of the machine roller, also known as silicone foam holster, this foaming process can not be infinite long, generally about 3 to 5 meters need to be cut. In other words, the general roller is long, so the use of this process of foam silicone tube naturally is not a problem, its advantage is that the foam silicone tube surface will form a layer (smooth), with good compression resistance and other foam silicone tube common features. Its main representative products are: printer silicone rubber foam roller, photocopier silicone rubber roller and so on.

After the production of these two kinds of conventional foamed silicone and oil furnace processes, there will be fine particles on the surface, especially in the black foam tube, the particles are particularly obvious, because the foamed silicone tube of the oil furnace process as a handle product has little impact on this particle, and many also need to be polished to skin the surface, so that you can't see the particles.