6results about How to "Reduce mist" patented technology

This invention discloses a respiratory protective face shield, comprising a helmet and a face shield that allows visible light to pass through. The face shield is located on the front of the helmet and is movably connected to the helmet, allowing it to cover the wearer's face. A transparent electrically heated film is provided in the transparent area of ​​the face shield that allows visible light to pass through. The helmet is equipped with a power supply component for providing electrical power. The electrodes of the electrically heated film are electrically connected to the power supply component. An air inlet is located on the rear of the helmet for connecting to an air supply device. An air passage is provided inside the helmet, with one end connected to the air inlet and the other end extending to the front of the helmet and communicating with the space between the face shield and the wearer's face. This invention provides a respiratory protective face shield that can reduce water vapor on the inner surface of the face shield during wear, ensuring a clear field of vision for the wearer.

The application discloses a preparation process of reconstituted tobacco leaf, which comprises the following steps: subjecting tobacco leaf raw materials to fresh air hot air treatment, and storing the tobacco leaf raw materials to obtain primary tobacco leaves with a water content of 15-25%; subjecting the primary tobacco leaves to hot air drying to obtain secondary tobacco leaves, wherein the hot air drying time is 10-20 min; and crushing the secondary tobacco leaves and preparing reconstituted tobacco leaves through a thick slurry method. The preparation process of the reconstituted tobacco leaf can reduce peculiar smell and irritancy, improve tobacco baking original aroma, improve sensory comfort, and improve sensory quality through the steps of multi-stage fresh air hot air drying, high-intensity drying and storage to ensure the water content.

The invention discloses a composite biological inoculant for promoting alcoholization of crude tobacco, which is prepared by the following steps: by taking bacillus licheniformis CICC 10037, candida utilis CICC 1769 and thermolysis thermophila ATCC 27730 as core functional strains, respectively activating and enlarging culture, then carrying out thallus resuspension by using a stable protective agent solution consisting of trehalose, sodium glutamate and sodium carboxymethyl cellulose, and finally, carrying out fermentation, so as to obtain the composite biological inoculant for promoting alcoholization of crude tobacco. The three strains are mixed according to a specific volume ratio to prepare a compound bacterium suspension, and finally the compound bacterium suspension is uniformly adsorbed to a sterilized homologous tobacco powder carrier, so that macromolecular substances such as starch, protein and cellulose in tobacco leaves can be efficiently degraded through the synergistic effect of the three strains, and the variety and content of aroma components are remarkably increased; the method effectively reduces irritant substances such as ammonia and acetaldehyde and harmful ingredients such as nitrosamine specific to tobacco, reduces offensive odor and irritation, improves taste, ensures uniformity and stability of the alcoholization effect, and achieves multiple purposes of quality improvement, aroma enhancement, harm reduction and efficiency improvement in the crude tobacco alcoholization process.

The invention belongs to the technical field of tobacco flavor preparation, and discloses a method for preparing tobacco flavor based on polysaccharide Maillard reaction and application of the tobacco flavor. The method comprises the following steps: dissolving amino acid and polysaccharide in a solvent according to a certain molar ratio to obtain a reaction material; putting the reaction materials into a reaction kettle, and carrying out Maillard reaction under a closed condition; and after the reaction is finished, rapidly cooling the reaction kettle to room temperature to obtain a Maillard reaction product. In the reaction process, polysaccharide is cracked into various reducing sugars step by step and is subjected to Maillard reaction with amino acid, so that the problems that monosaccharide participates in the Maillard reaction, the aroma is single, and the reaction is violent and difficult to control are effectively solved. When the tobacco flavor is applied to cigarettes, the irritation of smoke can be remarkably reduced, offensive odor can be covered, meanwhile, the smoke is softened, the aftertaste is improved, the smoke concentration is increased, and the baking fragrance and the sweet aftertaste are increased. The method is low in cost, simple in equipment and convenient to operate, can be put into production without modifying existing production equipment, and has a good industrial application prospect.

The invention relates to the technical field of gene engineering and enzyme engineering, and discloses an alpha-galactosidase mutant and a preparation method and application thereof, the amino acid sequence of the mutant is a wild type alpha-galactosidase amino acid sequence shown as SEQ ID NO.1, and the amino acid sequence of the mutant is a wild type alpha-galactosidase amino acid sequence shown as SEQ ID NO.2. The mutant is obtained by mutation of amino acid residues of one or more of the following sites: the 74th site, the 145th site, the 432th site, the 560th site and the 615th site; wherein the serial number of the amino acid site corresponds to a sequence as shown in SEQ ID NO. 1. The enzyme is extracted from bacillus megatherium, enzyme modification is carried out by adopting single-point mutation and saturated mutation technologies and through a free energy virtual screening coupling internal topological cavity engineering modification strategy, two-point mutants K74R and L432V with significantly improved enzyme activity are obtained, the mutants can rapidly degrade anti-nutritional oligosaccharides and polysaccharides in plant raw materials, and the anti-nutritional oligosaccharides and polysaccharides in the plant raw materials can be rapidly degraded. The compound can be used as an aroma enhancing enzyme to efficiently hydrolyze glucosidic bonds and release precursor aroma substances, and is applied to tobacco processing, plant extraction and essence and perfume industries.

This invention provides a centrifugal system and method for concentrating and removing impurities from tobacco alcohol extracts obtained through papermaking. The system includes a first feeding tank, a separator, and a second concentrated liquid feeding tank. The first feeding tank is equipped with a vertical stirrer, and has a concentrated liquid inlet, a reflux port, and a clean water inlet at the top, and an outlet at the bottom. The separator has an inlet and an outlet at the top. The second concentrated liquid feeding tank has a concentrated liquid inlet, a reflux port, and a clean water inlet at the top, and an outlet at the bottom. A concentrated liquid feeding pipeline is connected to the concentrated liquid inlet of the first feeding tank. The outlet of the first feeding tank is connected to both the reflux port of the first feeding tank and the inlet of the separator. The outlet of the separator is connected to the concentrated liquid inlet of the second concentrated liquid feeding tank. The outlet of the second concentrated liquid feeding tank is connected to both the reflux port of the second concentrated liquid feeding tank and a concentrator / evaporator. This system can effectively reduce the content of large-molecule insoluble matter in tobacco alcohol extracts and improve the quality of the extracts.