Polyurethane sponge is a kind of low-density polyurethane with a foam density less than 18kg/m3. It is usually made with more than 4.5% of water (100 parts of polyol), more than 55% of TDI and vacuum foaming. During the foaming process, the foam cell has to withstand the atmospheric pressure,Konjac sponge company the weight of the foam, and the gas expansion force. Under the condition of 4.3 parts of water (per 100 parts of polyether polyol), it is possible to produce a propriety foam with a density of about 24 kg/m ~ 3 .

When the external pressure is reduced to 0.05 MPa, the same 4.3 parts of water can make a bulk bubble with a density of 16 kg\\u002Fm3. It is worth noting that the rise and solidification time of the foam must be adjusted appropriately, i.e., the rise time should be extended and the solidification time should be delayed in order to ensure that the foam has sufficient foaming opportunity under negative pressure. For continuous flat-top block sponge, the equipment investment of "negative pressure foaming" is large, which is difficult for small and medium-sized enterprises to bear,karesponge but the investment cost of "box foaming" is not too large. Suggestions: build a cylindrical vacuum chamber, looks like a "vacuum drying box", plus a large pumping capacity of the vacuum pump to ensure that within 30 seconds can reach the required vacuum.

In operation, this teaching method is feasible. As long as by controlling the foaming time is not more than 30min, the large piece of foam will be moved into the forced cooling room, so that the foam economy continues to mature, can be realized to achieve the purpose of the design. The technology is very suitable for China's domestic development of large and medium-sized enterprises, investment in environmental transformation costs less costly,bulk sponges for cheap fast on the horse, but the polyether production equipment manufacturers to cooperate with the management of the work, to develop a special varieties in line with the high volume of water and low density PU soft foam.

Liquid CO2 foaming technology liquid CO2 (LCD) foaming technology, in the "big foam" foaming device to make appropriate adjustments and modifications, the production of a flat-top continuous foam (foam width of 2.2 m, foam height of 1.2 m) and foam density of about 14kg / m ~ 3 molded foam. The aerobic foam has a softer feel, higher open-cell structure and better elasticity than the larger foam.

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