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Method for preparing skin-core type composite polylactic acid tows for cigarettes by one-step method

A polylactic acid cigarette, skin-core technology, which is applied in the direction of conjugated synthetic polymer rayon, filament/thread forming, textile and papermaking, etc. and other problems, to achieve the effect of reducing the preparation cost, simplifying the equipment configuration, and improving the preparation efficiency

Inactive Publication Date: 2016-08-24
CHANGSHU GOLD SPRING CHEM FIBERS & KNITTINGS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And because the CN103074716B needs to drop the as-spun filaments produced by spinning into barrels and bundle them during the specific spinning process, the preparation process is lengthy and the equipment configuration is complicated, which not only affects the preparation efficiency, but also increases the preparation cost and is not conducive to saving energy. consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] First put the polylactic acid skin resin slices with an intrinsic viscosity of 1.38dl / g and a melting point of 131°C as component B into a vacuum drum dryer for pre-crystallization and drying to a moisture content of 150ppm to remove the polylactic acid skin resin slices To avoid the degradation of the polylactic acid skin resin chips during the melt extrusion process of the screw extruder, and to avoid the occurrence of ring blockage and pressure fluctuations during the extrusion process, the pre-crystallization is dried The polylactic acid skin resin slices with a moisture content of 150ppm are put into a single-screw extruder to be melted into a polylactic acid skin resin melt and extruded to a composite spinning box. The temperature control of each zone of the single screw extruder is: 150 °C in the first zone ℃, the second zone is 185°C, the third zone is 220°C, the fourth zone is 223°C, the fifth zone is 229°C, the temperature of the composite spinning box is 220°C...

Embodiment 2

[0022] First put the polylactic acid skin resin chip with an intrinsic viscosity of 1.2dl / g and a melting point of 135°C as component B into a continuous dryer for pre-crystallization and drying to a moisture content of 65ppm so as to remove the polylactic acid skin resin chips. Moisture, to avoid the degradation of the polylactic acid skin resin chip during the melt extrusion process of the screw extruder, and to avoid the occurrence of ring blockage and pressure fluctuations during the extrusion process, and dry the pre-crystallization until it contains moisture. Polylactic acid-coated resin slices with a rate of 65ppm are put into a single-screw extruder to melt into a polylactic acid-coated resin melt and extruded to a composite spinning box. The second zone is 200°C, the third zone is 220°C, the fourth zone is 230°C, the fifth zone is 235°C, and the temperature of the composite spinning box is 250°C; at the same time, polylactic acid with an intrinsic viscosity of 0.9dl / g ...

Embodiment 3

[0024] First put the polylactic acid skin resin slices with an intrinsic viscosity of 1.33dl / g and a melting point of 125°C as component B into a vacuum drum dryer for pre-crystallization and drying to a moisture content of 63ppm to remove the polylactic acid skin resin slices To avoid the degradation of the polylactic acid skin resin chips during the melt extrusion process of the screw extruder, and to avoid the occurrence of ring blockage and pressure fluctuations during the extrusion process, the pre-crystallization is dried The polylactic acid skin resin slices with a moisture content of 63ppm are put into a single-screw extruder to be melted into a polylactic acid skin resin melt and extruded to a composite spinning box. The temperature control of each zone of the single screw extruder is: 180 ℃, the second zone is 215°C, the third zone is 225°C, the fourth zone is 240°C, the fifth zone is 230°C, the temperature of the composite spinning box is 230°C; at the same time, the...

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Abstract

The invention provides a method for preparing skin-core type composite polylactic acid tows for cigarettes by a one-step method, and belongs to the technical field of preparation of cigarette filter tip materials. The method comprises the following steps: slicing polylactic acid skin layer resin and polylactic acid core layer resin and respectively feeding the slices into a pre-crystallization drying device for pre-crystallization drying at first; respectively feeding the polylactic acid skin layer resin slices and the polylactic acid core layer resin slices which are subjected to pre-crystallization drying into two screw extruders, melting into polylactic acid skin layer resin melt and polylactic acid core layer resin melt, and simultaneously extruding the polylactic acid skin layer resin melt and the polylactic acid core layer resin melt into a composite spinning box for spinning; spraying out in the form of filaments by using a spinneret; successively performing slow cooling, annular air blast cooling and curing, tow oiling, hot roller drafting, curling, loosing and shaping, filament swaying and packaging on the filaments to obtain the finished product, wherein the weight ratio of the polylactic acid skin layer resin slices to the polylactic acid core layer resin slices is 30-50:70-50, and a composite spinning assembly is provided with isolated flow paths. The method has the advantages that the preparation process is shortened, equipment layout is simplified, preparation efficiency is improved, preparation cost is reduced, and energy consumption is reduced.

Description

technical field [0001] The invention belongs to the technical field of cigarette filter material preparation, and in particular relates to a method for preparing skin-core composite polylactic acid tow in one step. Background technique [0002] The research history of polylactic acid fiber can be traced back to the 1930s, and its invention report can be traced back to the 1950s. Dubang Company first determined the molecular weight of polylactic acid ester. After the 1960s, scientific and technological workers from various countries After extensive research, Japan developed a new type of polylactic acid fiber using corn as a raw material. In the late 1990s, the United States developed polylactic acid fiber using corn as a raw material and took the lead in building a pilot plant, and then perfected the modern production of high-molecular polylactic acid. The advanced production process has played a leading role in the development of the polylactate industry. Subsequently, Jap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/34D01F8/14
CPCD01D5/34D01F8/14
Inventor 樊海彬杨新华李嘉薇
Owner CHANGSHU GOLD SPRING CHEM FIBERS & KNITTINGS
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