What does the Waterproof vent do?

Vent is an application in membrane separation, a new separation method to separate and filter mixtures under the action of external driving force by using a specially manufactured membrane with selective permeability. This membrane has the property of allowing some substances to pass through and some substances to not pass through. Since the 1960s, membrane separation technology has risen rapidly. At present, there are mainly PTFE, Nylon, PES, PVDF, PP, NC, MCE, PETE and other filtration membranes. Among them, PTFE is used for its superior chemical stability and natural hydrophobicity. in the field of ventilation.

Waterproof vent is mainly embodied in waterproof ventilation, dustproof ventilation and bacterial ventilation prevention, and is widely used in automobile, medical, environmental monitoring, packaging, electronic sensor protection and other fields. Waterproof vent is mainly used for waterproof and breathable clothing. It is called "breathable material" in foreign countries.

Vent mainly uses microfiltration membranes with pore sizes between 0.1-10μm. For vent, there are two very important values of water inlet pressure and air permeability. Under normal circumstances, the two are in a competitive relationship, and high air permeability means low water inlet pressure. vent mainly uses hydrophobic and oleophobic membranes, and in most cases, oleophobic membranes are used. Although ePTFE has natural hydrophobic and oleophobic properties, it will be wetted and penetrated when encountering some liquids such as alcohols, cleaning agents, and lubricants with low surface energy. The oleophobic film has a lower surface energy and can resist the infiltration of these liquids.

Since many devices and applications require a relatively closed environment, they cannot be affected by external dust, water, and bacteria. If it is designed to be particularly closed, under the objective conditions of ambient temperature and latitude changes, it will cause pressure changes. Usually, such pressure changes will have agglomeration effect, which will cause damage to the shell and the sensitive parts inside. The use of ePTFE vent can continuously balance the pressure difference, reduce the cost of component design, and ensure the reliability and reliability of the product.

At present, ePTFE vent is mainly used in: automotive ventilation, medical ventilation, electronic sensor ventilation, packaging ventilation, and packaging ventilation includes household packaging, agricultural packaging and industrial packaging and other fields.