Puffing Machine Processing Quality And Process Equipment Control Points
Crushing particle size control principles: die aperture requirements sieve aperture less than one-third of the die aperture, and the maximum aperture of the sieve does not exceed 1.2mm; product appearance requirements extrusion puffing process material crushing granularity of the finer, the better the appearance of the product; in addition, need to be based on the breeding varieties, economically rational control of the fineness of the material crushed to reduce the unnecessary cost of crushing.
Semi-finished powder screening and debris removal: for the extrusion die hole in 2.0mm or less, the powder shall be screened through 18 to 24 mesh screening and debris removal; when the extrusion die hole in 2.0mm or more, the powder shall be screened through 12 to 16 mesh screening and debris removal. When the die aperture diameter of 2.0mm or less, if the formula contains a larger proportion of fur and cotton husk raw materials, even after 24 mesh screening, the stability of extrusion production is still poor.
Die hole structure effective pressure distance: in the design of pressure distance parameters, when the hole diameter is less than 1.5mm pressure distance should be 1.2 ~ 1.5 times the hole diameter, when the hole diameter is greater than 2.0mm, the pressure distance for the aperture diameter of 0.8 ~ 2.0 times. The relationship between the pressure distance and the appearance of the product is shown as follows: the pressure distance of the mold hole is short, the surface of the product is porous, and the shape is spherical; the pressure distance of the mold hole is long, the surface of the product is smooth, and the shape is cylindrical.
Drying process equipment selection: when the product specifications and shapes of a variety of times, should choose the bed conveyor dryer, with self-cleaning and hot air circulation; when the product specifications and shapes of a single and large production batch, we should consider the requirements of the product moisture uniformity, fabric and discharge structure of the scientific and stable, the requirements to maintain the integrity of the particles and to prevent the process of cross-pollution.
