PLANT FOR MAKING FOAM PLASTIC FROM FOAM-FORMING AND PITCH COMPOSITION Russian patent published in 2013 - IPC B29C67/20 

FIELD: process engineering.

SUBSTANCE: invention relates to production of heat- and sound-isolation foam plastic. Proposed plant comprises two tanks, one filled with pitch composition, mixing chamber, foam generator communicated therewith, and compressed air source connected with foam generator and mixing chamber. Note here that mixing chamber is equipped with pitch composition sprayer connected with tank filled with pitch composition. Second tank is filled with foam generating agent with hardener and connected with foam generator. Compressor make a compressed air source. Tank with foam generating agent with hardener id equipped with plunger proportioning pump to feed components into foam generator. Tank for pitch composition is equipped with gear pump to feed composition into mixing chamber. Note here that all pumps share common drive for synchronous operation. Pitch composition sprayer is composed of nozzle connected with compressor to make pitch jet for injection of pitch composition into foam. Mixing chamber outlet is provided with hose to feed liquid foam plastic into forming tool. Note that all assembly units are mounted on automotive chassis. Note that ejection-type foam generator comprises cylindrical casing with flanges on ends. Nozzle to feed water solution of foam generator is fitted in one of said flanges. Air feed holes are made in casing side surface. Mixing chamber is arranged inside casing opposite said nozzle and attached to flange opposite the nozzle by its larger base. Nozzle is composed of conical shell with cone vertex directed opposite foam generator water solution feed flange. Ejector is arranged inside nozzle and made up of conical shell with cowl to make conical cavity with conical shell. Note that cowl is composed of 2^nd-order surface of revolution, for example, ball, ellipsoid, while ejector conical shell is aligned with nozzle conical shell. Annular variable-cross-section clearance is provided between conical shells of nozzle and ejector. Mind that said conical surfaces feature equal angles at cone vertices while ejector is secured to nozzle by, at least, three ejecting tubes with their one end located in cavity wile opposite end is located inside cylindrical casing. Note that cylindrical air duct is secured to ejector conical shell. Three radial air ducts are located near the edge on said air duct in plane perpendicular to casing axis and secured thereto by one end. Axes of said air ducts are arranged radially and regularly in said plane while free end of radial air ducts is located nearby the edge of horizontal air duct. Mixing chamber composed of confuser, cylindrical part and diffuser is arranged opposite and aligned with nozzle. Diffuser larger base is secured to flange.

EFFECT: increased foam ratio, decreased apparent density.

2 dwg