Method for preparing environment-friendly cigarette tows

Abstract

The invention relates to a method for preparing environment-friendly cigarette tows, which comprises the following steps of: drying and crystallizing, melting spinning, drafting and tension-finalizing, crimping, drying and thermal finalizing, wherein the drafting and tension-finalizing step employs a roller built-in heating way. The cigarette tows prepared by the method disclosed by the invention are higher in temperature of the crimping and the drying and thermal finalizing process steps in the preparation of the tows, shorter in production period, and improved in quality. And meanwhile, control of moisture can facilitate hot processing de-polymerization and hydrolysis degrees of polylactic acid, as a result, the spinning performance of the modified polylactic acid and the performance of tow products are improved.

Description

technical field [0001] The invention relates to the field of cigarettes, in particular to a method for preparing environmental-friendly tobacco tow. Background technique [0002] The development of filter tip is the product of cigarette development to a certain stage. When the filter first appeared, it was mainly used as a mouth-shaped part of the cigarette for decoration. With the development of cigarette technology and people's pursuit of low-harm cigarettes, the filter has gradually changed from a dispensable position to an indispensable part of cigarettes, and has assumed the function of reducing tar and harm. [0003] At present, the filter materials used commercially in the domestic market are mainly cellulose acetate fiber and polypropylene fiber, with a total amount of nearly 300,000 tons, of which cellulose acetate fiber accounts for more than 80%, but cellulose acetate fiber and polypropylene fiber Fiber has the following disadvantages: [0004] Cellulose acetat...

AI Technical Summary

Problems solved by technology

[0004] Cellulose acetate filter has the following disadvantages: 1) It is derived from wood (the growth cycle is generally greater than 5 years), and a large amount of use will destroy the ecological environment; 2) Although cellulose acetate is degradable, the degradation cycle is usually more than 4 years, so the filter rod Discarding will cause certain environmental pollution; 3) The solution spinning method is used for spinning, the production process is complicated, and there are environmental problems such as solvent acetone volatilization and recovery; 4) Processes, equipment, related technologies and some finished tows mainly rely on imports

[0005] There are many deficiencies in polypropylene filters: 1) polypropylene is derived from non-renewable resource petroleum, which does not meet global sustainable development and domestic conditions; 2) polypropylene is a non-polar material with poor adsorption performance, and the obtained filter rod Poor filtering performance, which is not conducive to human health; 3) Due to the non-polarity and high crystallinity of polypropylene fiber, the bonding performance is poor, and the process of bonding the tow into a filter rod is complicated

[0010] 1) The drying is insufficient, resulting in the water content of the finished tow exceeding 10%wt, which is higher than the water content standard of the existing acetate fiber tow and acrylic fiber tow, and the tow appears after a period of time in packaging due to the high moisture content Mildew;

[0011] 2) The water content of the tow produced in the crimping process section is higher than 15%wt. If the content of the dextrorotatory D component in the polylactic acid segment is greater than 3%wt, the tow will appear sticking and hardening at 50-60°C , resulting in unqualified tow;

[0012] 3) Insufficient shaping leads to poor dimensional stability of the tow, and the free shrinkage rate exceeds 2.5% at 50°C. The filter rod prepared from the tow has obvious problems such as head shrinkage, thermal collapse, and poor crimp resilience.

D-lactic acid (or D-lactide, a cyclic dimer of D-lactic acid) is involved in the patent raw material, and the patent has the following disadvantages: 1) Insufficient raw material production capacity (currently only the Dutch PURAC company and Japan's Musashino The company has pilot-scale products for sale); 2) High cost: the current price of D-lactic acid is 30,000-50,000 yuan / ton, while the price of L-lactic acid and D, L-lactic acid is 7,000-12,000 yuan / ton ;Drawing preheating also uses a water bath, and the drying step requires a large amount of energy

This patent has defects such as limited production capacity and high cost in practical application

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