3results about How to "Reduce tar" patented technology

The patent relates to the technical field of tobacco, and particularly relates to a conveying system for a paper-process sheet drying oven and the paper-process sheet drying oven. The conveying system comprises a conveying device, a first deviation rectifying device and a second deviation rectifying device. The first deviation rectifying device and the second deviation rectifying device are both used to provide displacement in a deviation rectifying direction to the conveying belt, the deviation rectifying direction is perpendicular to the length direction of the conveying belt, the distance between the first deviation rectifying device and the end driving roller is not greater than 10%, 20% or 25% of the length direction size of the transmission assembly, and the second deviation rectifying device is arranged substantially symmetrically to the middle line of the transmission assembly in the length direction of the first deviation rectifying device. The patent can better solve the deviation problem of the conveying belt, save labor cost, improve production efficiency and reduce the labor intensity of the operator. The deviation rectifying frequency of the first deviation rectifying device and the second deviation rectifying device is lower during the working process, and the first deviation rectifying device and the second deviation rectifying device are more suitable for deviation rectifying of long-distance belt conveying systems and have a longer service life.

The invention discloses surface-modified porous reconstructed tobacco particles, a preparation method thereof and a low-harm cigarette. The tobacco particles are prepared from the following raw materials in parts by weight through granulation and curing: 40-70 parts of tobacco raw materials, 20-55 parts of a filling agent, 1-8 parts of a humectant, 0.5-2.5 parts of a combustion improver, 0.05-1.5 parts of an essence material, 1-8 parts of a water-based coating material and 0.2-2 parts of nano metal oxide. The preparation process of the tobacco particles comprises the following steps: uniformly mixing the raw materials, granulating, spraying a modified mixed solution consisting of a water-based coating material and a nano metal oxide on the surfaces of the particles, and drying to obtain the tobacco particles. A low-harm cigarette formed by rolling a full-particle cigarette rod formed by curing the reconstructed tobacco particles and a cigarette filter paper rod is based on a three-dimensional honeycomb net structure of the reconstructed tobacco particles and catalytic degradation of harmful substances, and the technical problem that in the prior art, the harmful substances are reduced along with the evacuation feeling is effectively solved; and tar and other harmful components in the smoke are effectively reduced while the mellow and normal flavor of the smoke is ensured.

This invention relates to a method for reducing tar during carbon fiber production, a method for preparing carbon fiber, and the resulting carbon fiber. The method for reducing tar during production includes drying and pre-oxidizing the precursor fiber to obtain pre-oxidized fiber, and then subjecting the pre-oxidized fiber to low-temperature carbonization. In these steps, the fiber tension is controlled based on the product of the tow number and fineness to reduce the amount of tar generated during carbon fiber preparation. After low-temperature carbonization, high-temperature carbonization is performed to obtain carbon fiber. This method for preparing carbon fiber with reduced tar during production not only effectively reduces the amount of tar generated during the production of large-tow carbon fiber, and effectively solves the problems of excessive tar and easy blockage of the low-temperature carbonization furnace exhaust outlet in existing processes for preparing large-tow carbon fiber, but also improves carbon yield and the mechanical properties of carbon fiber.