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...

Examples

Embodiment 1

[0043] Embodiment 1: Process investigation of polylactic acid

[0044] First of all, it needs to be explained that the raw material polylactic acid of the present invention can be commercially available, preferably polylactic acid (wherein the dextrorotatory D component weight percentage is 0-3%), or polylactic acid (wherein the dextrorotatory D component weight percent 0-3% content) and other materials blends or copolymers (wherein the proportion of polylactic acid is higher than 70%wt).

[0045] In order to better design the polylactic acid tow preparation process, the characteristics of polylactic acid have been deeply studied.

[0046] 1. The relationship between the physical properties of polylactic acid and the content of dextrorotatory D component

[0047] The synthetic raw material of polylactic acid, lactic acid or intermediate lactide, has stereoisomerism, so polylactic acid should be a homopolymer of the same optically active monomer or a copolymer of different opt...

Embodiment 2

[0058] Embodiment 2: the preparation method of modified polylactic acid tow

[0059] 1. The raw material chips are polylactic acid (component D content is 1%wt), intrinsic viscosity is 1.53dl / g, melt index is 23.5g / 10min (210°C, 2160g), glass transition temperature is 62°C, and melting temperature is 170°C.

[0060] 2. The preparation process of tow is:

[0061] 1) Carry out stepwise heating and drying crystallization in the range of 70-110°C (heating rate 5°C / h, the temperature remains unchanged when the temperature reaches 110°C), the time is 12 hours, and the water content in the polymer is 70ppm;

[0062] 2) Melt spinning, the number of holes in the spinneret is 12000, the spinneret holes are trilobal, the temperature of the spinning screw is controlled at 235±1°C, the temperature of the box is 230±1°C, and the spinning speed is 65m / min , the roller is oiled, the roller speed is 16m / min, the oil concentration is 1%; the cooling air adopts inner ring radiation cooling, the...

Embodiment 3

[0067] Embodiment 3: the preparation method of polylactic acid tow

[0068] 1. The raw material slices are commercially available polylactic acid from Natureworks Company, the brand name is 6400D.

[0069] 2. The preparation process of tow is:

[0070] 1) Carry out stepwise heating and drying crystallization in the range of 50-90°C (heating rate 5°C / h, the temperature remains unchanged when the temperature reaches 90°C), the time is 18 hours, and the water content in the polymer is 85ppm;

[0071] 2) Melt spinning, the number of holes in the spinneret is 12000, the spinneret holes are trilobal, the temperature of the spinning screw is controlled at 225±1°C, the temperature of the box is 220±1°C, and the spinning speed is 65m / min , the roller is oiled, the roller speed is 16m / min, the oil concentration is 1%; the cooling air adopts inner ring radiation cooling, the cooling temperature is 18±1℃, and the wind pressure is 700Pa;

[0072] 3) Five rolls with drafting preheating at...

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...

Examples

Embodiment 1

[0043] Embodiment 1: Process investigation of polylactic acid

[0044] First of all, it needs to be explained that the raw material polylactic acid of the present invention can be commercially available, preferably polylactic acid (wherein the dextrorotatory D component weight percentage is 0-3%), or polylactic acid (wherein the dextrorotatory D component weight percent 0-3% content) and other materials blends or copolymers (wherein the proportion of polylactic acid is higher than 70%wt).

[0045] In order to better design the polylactic acid tow preparation process, the characteristics of polylactic acid have been deeply studied.

[0046] 1. The relationship between the physical properties of polylactic acid and the content of dextrorotatory D component

[0047] The synthetic raw material of polylactic acid, lactic acid or intermediate lactide, has stereoisomerism, so polylactic acid should be a homopolymer of the same optically active monomer or a copolymer of different opt...

Embodiment 2

[0058] Embodiment 2: the preparation method of modified polylactic acid tow

[0059] 1. The raw material chips are polylactic acid (component D content is 1%wt), intrinsic viscosity is 1.53dl / g, melt index is 23.5g / 10min (210°C, 2160g), glass transition temperature is 62°C, and melting temperature is 170°C.

[0060] 2. The preparation process of tow is:

[0061] 1) Carry out stepwise heating and drying crystallization in the range of 70-110°C (heating rate 5°C / h, the temperature remains unchanged when the temperature reaches 110°C), the time is 12 hours, and the water content in the polymer is 70ppm;

[0062] 2) Melt spinning, the number of holes in the spinneret is 12000, the spinneret holes are trilobal, the temperature of the spinning screw is controlled at 235±1°C, the temperature of the box is 230±1°C, and the spinning speed is 65m / min , the roller is oiled, the roller speed is 16m / min, the oil concentration is 1%; the cooling air adopts inner ring radiation cooling, the...

Embodiment 3

[0067] Embodiment 3: the preparation method of polylactic acid tow

[0068] 1. The raw material slices are commercially available polylactic acid from Natureworks Company, the brand name is 6400D.

[0069] 2. The preparation process of tow is:

[0070] 1) Carry out stepwise heating and drying crystallization in the range of 50-90°C (heating rate 5°C / h, the temperature remains unchanged when the temperature reaches 90°C), the time is 18 hours, and the water content in the polymer is 85ppm;

[0071] 2) Melt spinning, the number of holes in the spinneret is 12000, the spinneret holes are trilobal, the temperature of the spinning screw is controlled at 225±1°C, the temperature of the box is 220±1°C, and the spinning speed is 65m / min , the roller is oiled, the roller speed is 16m / min, the oil concentration is 1%; the cooling air adopts inner ring radiation cooling, the cooling temperature is 18±1℃, and the wind pressure is 700Pa;

[0072] 3) Five rolls with drafting preheating at...

Images