Wood pulp non-woven fabrics in use for tobacco

Abstract

The present invention relates to a wood pulp nonwoven fabric for manufacturing filter tip of cigarette. Said invention uses wood pulp fiber and high-melting point synthetic fiber or/and artificial fiber as raw material and adopts air laying mode to make them into fiber web, then utilizes adhesive to make crosslinking reaction so as to obtain the invented nonwoven fabric for manufacturing filter tip of cigarette.

Description

technical field [0001] The invention relates to the technical field of cigarettes and non-woven fabrics, in particular to a tobacco wood pulp non-woven fabric used for manufacturing cigarette filter tips. Background technique [0002] The cigarette filter can effectively reduce the harm of cigarettes, absorb various harmful substances in the smoke of cigarettes after burning, and improve the smoking quality of cigarettes. At present, there are mainly two kinds of filter materials in domestic and foreign markets, diacetate fiber tow and polypropylene tow. Among them, cellulose diacetate tow is the most commonly used nozzle rod material. The global annual usage is about 650,000 tons. Its comprehensive performance is good, but its production process is complicated and has certain environmental pollution. The price is relatively expensive and the adsorption efficiency is limited. , especially as a modified plant fiber, it is difficult to be decomposed in nature, and it is easy ...

AI Technical Summary

Problems solved by technology

Whether it is diacetate fiber tow or polypropylene tow, after molding according to the current mature technology, the filter channels are mainly linear, and the filtration of flue gas is not sufficient

At the same time, because their molding process is very mature, it is not conducive to adding coke-reducing and harm-reducing functional substances that are increasingly valued by the industry. For example, adding activated carbon to the nozzle rod needs to be independent of the nozzle rod molding process. The external addition process, not only the process cost is expensive, but also the addition is uneven

[0003] The literature shows that some domestic enterprises use chemical fiber non-woven fabrics to make mouth sticks. From the analysis of the raw materials used, there is no essential difference from the raw materials used in the current commonly used acrylic fiber mouth sticks. Although it is beneficial to reduce cigarette manufacturing costs and improve the quality of mouth sticks Adsorption efficiency, but the shortcomings of chemical fiber itself, which are difficult to decompose and have limited adsorption capacity, cannot be overcome.

Because natural wood fiber has good adsorption performance, more and more attention has been paid to the mouth stick with wood fiber as raw material. For example, CN1048492 discloses a composite mouth stick, which uses pulp as raw material to suppress a kind of special paper, and the paper mouth made The rod is soft, because of the uneven distribution of fibers, it is difficult to meet the national quality standards for mouth rods

Another example is my country's invention patent "natural fiber filter stick" (ZL01255200), which uses natural fibers and additives, and adopts the foam molding process to make the mouth stick. Pores seriously affect the adsorption performance of the tip stick, and special equipment is required, which has not been used in actual production; there are also literature reports that some companies use wood pulp fiber paper as cigarette filter material, and paper made by wet-laid method , affected by its molding process, there is an obvious problem of fiber hardening, which is prominently manifested as uneven filtration channels after molding, a large proportion of large-aperture channels, insufficient filtration, and appearance problems after the nozzle rod is formed, and the cross-section has obvious It is difficult to meet the requirements of cigarette production, and there is no report on its use in industrial production.

my country's patent application "dry-laid paper cigarette filter rod and its preparation method" (application number 200510024998.X) uses commercially available dry-laid paper (also known as dust-free paper) with a certain bulkiness after special treatment in the mouth stick The filter tip is directly manufactured on the forming machine. The main problem of this invention is: there are many short fibers in the dry-laid paper that are not bonded, and there is obvious dust when the nozzle rod is cut, and the short fiber is likely to be sucked during suction. For example, in the lungs, there are obvious safety hazards. In addition, the pressure resistance of the paper is not enough. In fact, the hardness of the mouth stick is difficult to meet the national standard.

Exactly the above-mentioned problems exist, the same inventor has carried out amendment to this patent, has applied for "dry-laid paper cigarette filter stick and its preparation method" (application number 200510024267.X), although the technology after improvement solves dust However, in the improved technical scheme, synthetic low-melting hot-melt fibers are used as the main bonding material, such as PE / PP, PE / PET. Because the skin fiber PE of the composite fiber used is relatively soft, the cloth is also Soft, insufficient compression resistance, the hardness, weight, and suction resistance of the filter rod are difficult to meet the national quality requirements, and the melting point of PE is low, and the molded filter rod has obvious thermal collapse during smoking, which is difficult for cigarette companies. accept