Polylactic acid self-curled and self-bonded composite cigarette tow and preparation method thereof

Abstract

The invention discloses a polylactic acid self-curled and self-bonded composite cigarette tow and a preparation method thereof. The preparation method comprises the following steps: drying polylacticresin; adding a spinning assistant for the polylactic resin into conventional polylactic resin, adding the spinning assistant to polylactic resin containing a plasticizer, and performing melting plasticization to obtain a polylactic resin melt; spraying the melt from a spinneret hole to form single composite fibers; cooling a polylactic acid two-component cigarette tow; oiling the two-component tow, and carrying out drafting and tension heat setting to obtain the polylactic acid self-curled and self-bonded composite cigarette tow. The single fibers in the tow is one of a side-by-side, orange-slice, sheath-core and sea-island composite structures, one of the components of the side-by-side type or the orange-slice type structure is the polylactic resin containing the plasticizer, and the remaining component is the conventional polylactic resin and a composition thereof. The preparation method has the advantages of simplification of the production process, avoiding of mechanical and thermal damages, increase of the rod yield of the polylactic fiber tow, and reduction of the production cost; and the polylactic acid self-curled and self-bonded composite cigarette tow has a good biodegradability.

Description

technical field [0001] The invention belongs to the technical field of tobacco tow and its preparation, in particular to a polylactic acid self-crimping and self-adhesive composite tobacco tow, and also relates to a preparation method thereof. Background technique [0002] Cigarette tow is an important part of cigarette filter rods. Through direct interception, inertial compaction and diffusion and precipitation, it can effectively reduce the smoke, tar and suspended particles produced during smoking, improve the taste and improve the quality of cigarettes. . At present, the tobacco tow materials on the market are mainly cellulose acetate tow, and a small amount of polypropylene fiber tow is used. The filter rod produced by cellulose acetate tow has excellent comprehensive performance and is mainly used for middle and high-end cigarettes. However, cellulose acetate tow is made of high-quality wood, and it undergoes a series of processes such as pulping, activation, acetylat...

AI Technical Summary

Problems solved by technology

However, polylactic acid fibers have the following problems in the tobacco tow processing technology and filter rod forming process: polylactic acid fibers lack safe and effective binders such as glycerol triacetate, so in order to meet the filter rod suction resistance, hardness and appearance and other requirements, more tows must be filled, resulting in a low yield of polylactic acid fiber tows. At the same time, compared with cellulose acetate and polypropylene fibers, the specificity of polylactic acid fibers is large, which will also cause a significant increase in cost.

However, it is necessary to increase the content of dextrorotary units in the cortex resin or use lactide and glycolide or caprolactone copolymerization, thereby reducing the crystallinity of the cortex resin, and at the same time, strictly control the content of polylactic acid dextrorotary units in the core resin or Adding a crystallization accelerator to improve the crystallinity of the core resin, therefore, this patent has higher requirements on raw materials and stricter production process

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