2results about How to "Uniform rate" patented technology

This invention provides a device and method for separating tobacco scraps and recovering tobacco shreds in the cigarette manufacturing process. The tobacco scraps are fed into a primary vibrating screen via an elevator. "Hard, piercing" scraps are captured by an orthogonal curved screen plate and cylindrical screening holes with alternating dot matrix, separating tobacco dust and scraps with a diameter less than d1. The remaining material is fed into a secondary vibrating screen, where curved guide strips, a size-controlled screen plate, screening holes, separation holes, and a separation surface control the separation of hard scraps with a length greater than d2 and poor plasticity. Flexible tobacco shreds pass sequentially through the screening holes, separation holes, and separation surface, and are finally fed into a tobacco collection box. This invention provides high loosening force, screening efficiency, and low breakage rate for tobacco scraps, and accurately separates scraps from tobacco scraps, improving the recovery rate and quality of tobacco shreds.

The present application relates to the technical field of waterborne polyurethane materials, and particularly relates to a low VOC waterborne PU foam pad and a preparation method thereof. The foam pad is formed by foaming and curing of a waterborne polyurethane dispersion, and two types of aldehyde-trapping sites are simultaneously introduced into the same porous framework, i.e. an amidoxime group formed by post-conversion of a nitrile group precursor by hydroxylamine, and an aminooxy group obtained by coupling and deprotection of T-BOC-aminooxy-diglycol-amino through a carboxyl anchoring site under an EDC and NHS activation system; and a water-dispersible blocked polyisocyanate crosslinking agent is used to form a crosslinking network by pyrolytic deblocking, so as to achieve rapid capture and durable retention of aldehydes such as formaldehyde and acetaldehyde under water washing and humid heat conditions, and simultaneously help to reduce VOC emission of the material.