Intermittent pre-engine (also known as quantitative pre-generator or pressurized pre-hair machine), mainly used to support the full active packaging machine, after the supply of uniform density without the presence of caking EPS pre-release material to satisfaction Packaging of the finished product production process of the molding conditions. The intermittent pre – engine is divided into vacuum intermittent pre – engine and ordinary intermittent pre – engine. With the specifications of the case is usually more than a series of large volume, feeding, destruction, air-efficient equipment is also a better request.
The preheater barrel is set in front of the oscillation type of the degree of foam induction control, can accurately perceive the rise of the foam particles, so that the density of the pre-beads is more uniform, as long as ± 0.3kg / m3, which is intermittent The type of pre-engine is different from the main features of a series of pre-engine. When the beads are discharged, the internal temperature of the cylinder is changed to a small extent, and the agglomeration of the condensate and the agglomeration of the beads are removed. As a result, the moisture content of the material can be reduced and the thermal power can be reduced. This intermittent pre-engine in the operation from the feeding, heating, discharge, feeding to the air drying process selection of active procedures, conditioning is both convenient and accurate. The advance of the beads from the bottom up, when the arrival of a certain height, the photoelectric tube can be announced by the signal can be discharged, precise action, active, when the foam pressure stabilized, the density is simply consistent, the precise selection of forming conditions important.
Because the active control equipment gradually supporting the machine can be prepared to heat, heated to a certain temperature can be very convenient to enter the active pre-hair, such as problems, can take the initiative to show. Such equipment to participate in the number of beads is very accurate, the machine temperature at any time to show, evenly into the air, and equipped with air purge equipment; other, such equipment with air, damage feeding equipment, but also relatively simple control. Feeding equipment usually with a ventilation filter equipment, powder is not easy to enter the hair machine, less prone to block and agglomeration. On the low foaming agent (longer storage time) of the material beads and lighter pre-beads, but also to achieve a better effect, which is on the decline in capital and material adaptability has advantages. In particular, taking into account the request for environmental protection, some manufacturers have now promoted the use of low foaming agent content of the material (about 3 010), in this case the use of intermittent pre-hair machine, the production of high power.