CN110528335B

CN110528335B - Method for manufacturing filter tip paper by PLA fiber wet process

Info

Publication number: CN110528335B
Application number: CN201910799135.1A
Authority: CN
Inventors: 何兆秋; 周再利; 张成龙; 纪军; 潘立国; 鲍漫秋
Original assignee: Mudanjiang Hengfeng Paper Co ltd
Current assignee: Mudanjiang Hengfeng Paper Co ltd
Priority date: 2019-08-28
Filing date: 2019-08-28
Publication date: 2021-11-30
Anticipated expiration: 2039-08-28
Also published as: CN110528335A

Abstract

The invention provides a method for making filter tip paper by using PLA fiber wet process, which comprises the following steps: (1) pulping the fiber raw material containing polylactic acid; (2) diluting the mixed slurry, adding an auxiliary agent, and then carrying out net-feeding forming treatment; then, carrying out net part, squeezing dehydration and drying treatment to obtain a dry paper sheet; (3) and sequentially coiling and cutting the dry paper to obtain the paper. The filter tip paper of the invention is easy to process and form, has uniform indexes, good quality stability and good cooling effect. The fiber raw materials adopted in the method can be degraded, are green and environment-friendly, and have low vitrification temperature and good cooling effect; the technical process is simple and easy to implement, the cost is low, the production efficiency is high, and the filter tip paper with excellent performance and good smoking experience can be obtained.

Description

Method for manufacturing filter tip paper by PLA fiber wet process

Technical Field

The invention belongs to the technical field of filter tip paper preparation, and particularly relates to a method for manufacturing filter tip paper by using a PLA fiber wet method.

Background

With the improvement of living standard, more and more people pay attention to the smoking health problem. Heating without combustion is currently a globally accepted means of healthy smoking. The heat not burn technology enables the cigarette to be heated just enough to emit the flavor without lighting the cigarette. Under the common condition, when the common cigarette is ignited for smoking, a high temperature of 500-900 ℃ can generate a plurality of harmful substances, the heating non-combustion technology can control the temperature, the harmful substances can be greatly reduced, and the individual requirements of young people can be met. However, the tobacco shreds for the cigarette which are not combusted by heating are different from common cigarettes, do not participate in combustion, have lower heating temperature, have insufficient cracking of tobacco substances, obviously reduce the release amount of aroma components in smoke compared with the traditional cigarette, and have poorer mouthfeel if the smoke interception efficiency of the filter rod is high, so the filter rod does not need to have overhigh filtering effect, otherwise, the sensory requirements of smokers cannot be met. However, since the cigarette is not combusted by heating, the tobacco shreds are heated by a special heat source (about 300 ℃), the generated smoke has higher temperature, the temperature of the smoke needs to be reduced to 35-70 ℃, and the high temperature can cause obvious hot burning and spicy stimulation to smokers, particularly causes discomfort in oral cavity, throat and lung. .

At present, various tobacco companies at home and abroad aim at the technical problem to carry out different forms of technical innovation, and various big tobacco companies including Feimeo international re-carry out cigarette design aiming at the defects of over-burning of smoke and the like and adopt different solutions. For example, the heated non-burning cigarette iQOS matched with Marlboro HeatSticks proposed by Felmo International uses embossing gathered PLA film cooling material in a composite filter tip; glo of Yingmei tobacco is a surrounding heating product, and a perforated hard paper hollow nozzle rod is used in the superfine Kent cigarette to reduce the smoke temperature; the finished cigarette is manufactured by heating a product with a center pin, which is a lil product from KT & G, Korea corporation, and the finished cigarette is cooled by using a woven bundle of PLA fibers.

Related research work is also carried out by various domestic cigarette companies, and the tobacco products are applied to the tobacco products. The width of the Sichuan Zhongyan is reduced by adopting embossed gathered aluminum foil composite paper, and the length of the reduced temperature section is 18 mm; the MOK cigarette in Hubei uses embossing gathering PLA cooling section with length of 20 mm; the 'MC' cigarette in Yunnan province uses 10mm of embossing gathered PLA film; the MU cigarette in Guangdong uses a starch hollow pipe with the diameter of 23mm as a cooling section; the Nantong acetic acid technology center develops cooling type acetate fiber particles and the like. The cigarette which is not heated and combusted in the prior art has certain cooling effect on smoke, but has different defects, such as poor cooling effect, difficult processing, large equipment investment, high cost, restricted raw materials and the like.

The material of the temperature reduction section of the QOS heating non-combustible cigarette filter stick proposed by Felmo is mainly PLA thin sheets which are folded, pleated, gathered and folded, but the PLA material in the form also has the problems of low temperature reduction efficiency and high smoke temperature, and the price of the PLA thin sheet is higher than 60 yuan/kg. The width of the cigarette in Sichuan is reduced by adopting the embossed gathered aluminum foil composite paper, and the cigarette has large consumption, heavy rod weight and nondegradable property. A23 mm starch hollow pipe is used as a cooling section of the MU cigarette in Guangdong, the starch hollow pipe is easy to absorb moisture and is greatly influenced by the environment, and the stability is restricted. The cooling type acetate fiber particles developed by the technical center of Nantong acetic acid have higher raw material processing cost.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a method for making filter tip paper by using a PLA fiber wet method, the method is easy to process filter tips, has lower cost than PLA sheets, is soft in paper quality, can adjust the adding proportion according to requirements, has stronger adaptability, and can further improve and promote the smoking experience of cigarette products. The technical scheme of the invention is as follows:

in a first aspect, the present invention provides a method for making filter plug paper by using PLA fiber wet process, comprising the following steps:

(1) pulping the fiber raw material containing polylactic acid;

(2) diluting the mixed slurry, adding an auxiliary agent, and then carrying out net-feeding forming treatment; then, carrying out net part, squeezing dehydration and drying treatment to obtain a dry paper sheet;

(3) and sequentially coiling and cutting the dry paper to obtain the paper.

Further, the fiber raw material containing polylactic acid comprises, by weight, 0-50 parts of bleached softwood pulp, 0-30 parts of unbleached softwood pulp, 0-40 parts of hemp pulp, 10-85 parts of polylactic acid (PLA) fiber, 0-30 parts of polyethylene terephthalate (PET) and 0-5 parts of polyvinyl alcohol (PVA).

Further, the length of the polylactic acid fiber is 3-6 mm, and the thickness is 1.1-1.7 dt.

Further, the length of the polyethylene terephthalate is 3-6 mm, and the thickness is 1.1-1.7 dt.

Furthermore, the length of the polyvinyl alcohol is 3-6 mm, and the thickness of the polyvinyl alcohol is 1.1-1.7 dt.

Further, the control parameters of the pulping treatment are as follows: the pulping concentration of the wood pulp and the hemp pulp is 2.0-5.0%, and the pulping degree is 10-45 DEG SR.

Further, the auxiliary agent comprises one or more of polyacrylamide, polyethylene oxide, reinforcing agent, defoaming agent and foam inhibitor.

Further, the control parameters of the net surfing forming processing are as follows: the concentration of the upper net is 0.02-0.08%, and the water content of the paper outlet part is 80-90%.

Furthermore, the water content of the pressed paper sheet after the pressing dehydration treatment is 65-75%.

Further, the temperature of the drying treatment is 70-130 ℃.

In a second aspect, the present invention provides a filter plug wrap, made by the above method.

The polylactic acid (PLA) is prepared by using crops such as corn, cassava and the like as raw materials, fermenting and extracting the raw materials by microorganisms to prepare lactic acid, refining, dehydrating, oligomerizing, cracking at high temperature and polymerizing. It has excellent biodegradability, and can be completely degraded by microorganisms in soil to generate CO in one year after being discarded₂And water, and no pollution is caused to the environment. Fig. 1 shows a schematic structural diagram of PLA fiber staple, and PLA itself is aliphatic polyester, has basic characteristics of general polymer materials, good machining performance, low shrinkage, and wide application in packaging materials, clothing, coated paper, etc. The present inventors have for the first time attempted to combine PLA fibres with a wet papermaking process to produce a plugwrap, with the aim of improving the performance of the plugwrap and enhancing the smoking experience.

Compared with the prior art, the invention has the beneficial effects that:

1) the filter tip paper of the invention is easy to process and form, has uniform indexes, good quality stability and good cooling effect.

2) The fiber raw materials adopted in the method can be degraded, are green and environment-friendly, and have low vitrification temperature and good cooling effect; the technical process is simple and easy to implement, the cost is low, the production efficiency is high, and the filter tip paper with excellent performance and good smoking experience can be obtained.

Drawings

FIG. 1 is a schematic structural view of a PLA fiber staple used in an example of the present invention.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as specifically described herein, and thus the scope of the present invention is not limited by the specific embodiments disclosed below.

Example 1

The embodiment provides a method for manufacturing filter tip paper by using PLA fiber through a wet process, which comprises the following steps: the selected fiber raw materials are as follows: bleached softwood pulp 20%, PLA fibres 75% (1.5 dt × 6 mm), PVA fibres 5% (1.1 dt × 3 mm).

Adopting a cylinder paper machine for papermaking: the vehicle speed is 50m/min, and the pulping process comprises the following steps: bleaching softwood pulp, the concentration is 3.5%, the power is 100KW, the time is 50min, and the beating degree is 20 DEG SR; PLA fiber slurry with the concentration of 1.0 percent and the power of 90KW, and the fluffing time of 30 min; then evenly stirring the pulped bleached softwood pulp, the defibered PLA fiber pulp and the PVA fiber in a mixed pulp bin, diluting the mixed pulp to the concentration of 0.8%, and adding an auxiliary agent, wherein the auxiliary agent is as follows: the addition amount of polyethylene oxide PEO is 0.8 percent (absolute dry pulp amount), and the concentration is 0.05 percent; defoaming agent 3.0 kg/ton paper; 5.0kg of foam inhibitor per ton of paper; then, carrying out net-feeding forming treatment, and then carrying out net-feeding part, squeezing dehydration and drying treatment, wherein the net-feeding concentration: 0.02 percent; the moisture of a paper sheet outlet part is 90 percent, the water of a paper sheet outlet part is 70 percent, and the temperature of a drying cylinder is 80-125 ℃, so that a dry paper sheet is obtained; and sequentially coiling and cutting the dry paper to obtain the paper.

Forming a product index: quantitative determination of 40g/m²The quantitative difference of the banner is 0.7 g/m²Tightness 0.30g/cm³Tensile strength 1.23 kN/m, air permeability 15000CU, moisture 6%, liquid absorption height 65mm/10 min. The smoke passing temperature of the detection filter tip is 33 ℃.

Example 2

The embodiment provides a method for manufacturing filter tip paper by using PLA fiber through a wet process, which comprises the following steps: the selected fiber raw materials are as follows: unbleached softwood pulp 20%, PLA fiber 75% (1.5 dt × 6 mm), PVA fiber 5% (1.1 dt × 3 mm).

Manufacturing on an inclined wire paper machine: the vehicle speed is 100m/min, and the pulping process comprises the following steps: unbleached softwood pulp, the concentration is 3.5%, the power is 100KW, the time is 30min, and the beating degree is 40 DEG SR; PLA fiber slurry with the concentration of 1.0 percent and the power of 90KW, and the fluffing time of 30 min; then uniformly stirring the unbleached softwood pulp after pulping, the defibered PLA fiber pulp and the PVA fiber in a mixed pulp bin, and adding an auxiliary agent: the addition amount of polyethylene oxide PEO is 0.8 percent (absolute dry pulp amount), the concentration is 0.05 percent, and the defoaming agent is 3.0 kg/ton of paper; 5.0kg of foam inhibitor per ton of paper; then, carrying out net-feeding forming treatment, and then carrying out net-feeding part, squeezing dehydration and drying treatment, wherein the net-feeding concentration: 0.03 percent; the moisture of the paper outlet part is 90 percent, the water of the paper outlet part is 75 percent, and the temperature of a drying cylinder is 70-110 ℃, so that dry paper is obtained; and sequentially coiling and cutting the dry paper to obtain the paper.

Forming a product index: quantitative determination of 41.5 g/m²The quantitative difference of the banner is 0.90 g/m²Tightness 0.38g/cm³Tensile strength 1.01 kN/m, air permeability 10200 CU, water content 4%, liquid absorption height 60mm/10 min. The smoke passing temperature of the detection filter rod is 38 ℃.

Example 3

The embodiment provides a method for manufacturing filter tip paper by using PLA fiber through a wet process, which comprises the following steps: the selected fiber raw materials are as follows: hemp pulp 20%, PLA fibres 75% (1.5 dt × 6 mm), PVA fibres 5% (1.1 dt × 3 mm).

Manufacturing on an inclined wire paper machine: the vehicle speed is 100m/min, and the pulping process comprises the following steps: pulping with the concentration of 3.0 percent and the power of 100KW, the time of 40min and the pulping degree of 30 DEG SR; PLA fiber slurry with the concentration of 1.0 percent and the power of 90KW, and the fluffing time of 30 min; then uniformly stirring the beaten hemp pulp, the defibered PLA fiber pulp and the PVA fiber in a mixed pulp bin, diluting the mixed pulp to the concentration of 0.8%, and adding an auxiliary agent, wherein the auxiliary agent is as follows: the addition amount of polyethylene oxide PEO is 0.8 percent (absolute dry pulp amount), and the concentration is 0.05 percent; reinforcing agent: 1.0% (absolute dry pulp); defoaming agent 3.0 kg/ton paper; 5.0kg of foam inhibitor per ton of paper; then, carrying out net-feeding forming treatment, and then carrying out net-feeding part, squeezing dehydration and drying treatment, wherein the net-feeding concentration: 0.02 percent; the moisture of a paper sheet outlet part is 90 percent, the water of a paper sheet outlet part is 75 percent, and the temperature of a drying cylinder is 70-110 ℃, so that a dry paper sheet is obtained; and sequentially coiling and cutting the dry paper to obtain the paper.

Forming a product index: quantitative determination of 40g/m²The quantitative difference of the banner is 0.8 g/m²Tightness 0.32 g/cm³Tensile strength of 1.2kN/m, air permeability of 12500 CU, moisture of 6.5% and liquid absorption height of 63mm/10 min. The smoke passing temperature of the detection filter tip is 35 ℃.

Example 4

The embodiment provides a method for manufacturing filter tip paper by using PLA fiber through a wet process, which comprises the following steps: the selected fiber raw materials are as follows: hemp pulp 20%, PLA fibres 55% (1.5 dt × 6 mm), PET fibres 20% (1.7 dt × 4 mm), PVA fibres 5% (1.1 dt × 3 mm).

Adopting a cylinder paper machine for papermaking: the vehicle speed is 60m/min, and the pulping process comprises the following steps: pulping with the concentration of 3.0 percent and the power of 100KW, the time of 40min and the pulping degree of 35 DEG SR; mixing PLA fibers and PET fibers, defibering with the concentration of 1.0 percent and the power of 90KW for 30 min; polyvinyl alcohol (PVA) fiber is added into the mixed pulp bin and is uniformly stirred, and the auxiliary agent is added: the adding amount of polyacrylamide APAM is 0.8 percent (absolute dry pulp amount), and the concentration is 0.05 percent; defoaming agent 3.0 kg/ton paper; 5.0kg of foam inhibitor per ton of paper; then, carrying out net-feeding forming treatment, and then carrying out net-feeding part, squeezing dehydration and drying treatment, wherein the net-feeding concentration: 0.02 percent; the moisture of the paper sheet outlet part is 90 percent, the water of the paper sheet outlet part is 75 percent, and the temperature of a drying cylinder is 70-115 ℃ to obtain dry paper sheets; and sequentially coiling and cutting the dry paper to obtain the paper.

Forming a product index: quantitative determination of 41 g/m²The quantitative difference of the banner is 0.9 g/m²Tightness 0.35 g/cm³Tensile strength of 1.0 kN/m, air permeability of 10800 CU, moisture of 6 percent, liquid absorption height of 60mm/10min, and smoke passing temperature of a detection filter rod of 37 ℃.

Comparative example 1

The comparative example provides a method for manufacturing filter tip paper by using PLA fiber wet process, which comprises the following steps: the selected fiber raw materials are as follows: bleached softwood pulp 20%, PET fibers 75% (1.7 dt x 4 mm), PVA fibers 5% (1.1 dt x 3 mm).

Making by a cylinder paper machine: the vehicle speed is 50m/min, and the pulping process comprises the following steps: bleaching softwood pulp, the concentration is 3.5%, the power is 100KW, the time is 50min, and the beating degree is 20 DEG SR; PLA fibre is defibered, and thick liquids concentration is 1.0%, power 90KW, and defibering time 30min, then the bleached softwood pulp that will beat the thick liquid, the PLA fibre thick liquids that defiber and PVA fibre stir in mixing the thick liquid storehouse evenly, and it is 1.0% to dilute the concentration with mixed thick liquids, adds the auxiliary agent, and the auxiliary agent is: the addition amount of polyethylene oxide PEO is 0.7 percent (absolute dry pulp amount), and the concentration is 0.05 percent; 3.0kg of defoaming agent per ton of paper; 6.0kg of foam inhibitor per ton of paper; then, carrying out net-feeding forming treatment, and then carrying out net-feeding part, squeezing dehydration and drying treatment, wherein the net-feeding concentration: 0.02 percent; the moisture of a paper sheet outlet part is 87 percent, the water of a paper sheet outlet part is 72 percent, and the temperature of a drying cylinder is 80-115 ℃ to obtain a dry paper sheet; and sequentially coiling and cutting the dry paper to obtain the paper.

Forming a product index: quantitative determination of 41 g/m²The quantitative difference of the banner is 1.2 g/m²Tightness 0.39 g/cm³Tensile strength of 0.65 kN/m, air permeability of 10900CU, moisture of 5.5 percent and liquid absorption height of 50mm/10 min. The smoke passing temperature of the detection filter tip is 45 ℃.

Comparative example 2

The comparative example is a process for producing filter tip paper by adopting the prior art, and comprises the following steps: the selected fiber raw materials are as follows: 50% of bleached softwood pulp and 50% of hemp pulp.

Manufacturing on an inclined wire paper machine: the vehicle speed is 100m/min, and the pulping process comprises the following steps: bleaching softwood pulp, the concentration is 3.5%, the power is 100KW, the time is 30min, and the beating degree is 20 DEG SR; the pulping process comprises the following steps of (1) diluting mixed pulp to the concentration of 0.8% by using a pulping degree SR of 25 degrees, wherein the pulping concentration is 3.0%, the power is 100KW, the time is 30min, and the auxiliary agent is added: the addition amount of polyethylene oxide PEO is 0.8 percent (absolute dry pulp amount), the concentration is 0.05 percent, and the defoaming agent is 1.0 kg/ton of paper; 2.0kg of foam inhibitor per ton of paper; then, carrying out net-feeding forming treatment, and then carrying out net-feeding part, squeezing dehydration and drying treatment, wherein the net-feeding concentration: 0.02 percent; and (3) the moisture of the paper sheet at the net outlet part is 90 percent, the squeezed moisture is 75 percent, the temperature of a drying cylinder is 70-105 ℃, and the dried paper sheet is obtained after winding and cutting treatment in sequence. .

Forming a product index: quantitative determination of 42 g/m²The quantitative difference of the banner is 1.3 g/m²Tightness 0.40 g/cm³Tensile strength of 0.72 kN/m, air permeability of 2000 CU, moisture content of 6% and liquid absorption height of 38mm/10 min. The smoke passing temperature of the filter rod is 48 ℃.

Comparative example 3

The comparative example provides a method for manufacturing filter tip paper by using PLA fiber wet process, which is different from the method in example 1 in that: the selected fiber raw materials are as follows: bleached softwood pulp 20%, PLA fiber 75% (1.5 dt × 8 mm), PVA fiber 5% (1.1 dt × 3 mm), other conditions were the same as in example 1.

Forming a product index: quantitative determination of 40.5 g/m²The quantitative difference of the banner is 1.2 g/m²Tightness 0.41 g/cm³Tensile strength of 0.70kN/m, air permeability of 11200 CU, moisture of 6.3 percent and liquid absorption height of 50mm/10 min. The smoke passing temperature of the filter tip is 42 ℃.

The data for all examples and comparative examples are summarized in table 1.

TABLE 1

Each test was conducted on the above 5 examples

1) The total number of colonies was measured as shown in Table 2.

TABLE 2 Total colony count test results

Examples	Total number of colonies CFU/g
		1	<10
2	<10
		3	<10
4	<10
		5	<10

Note: the test method is referred to GB 4789.2-2016.

2) Heavy metals and volatile species were detected as shown in table 3.

TABLE 3 heavy metal and volatile substance assay results

Detecting items

Unit of

Example 1

Example 2

Example 3

Example 4

Example 5

Arsenic (As)

mg/kg

0.10

Not detected out

0.04

Not detected out

0.10

Lead (II)

mg/kg

0.08

Not detected out

0.06

0.05

Cadmium (Cd)

mg/kg

Not detected out

Chromium (III)

mg/kg

0.46

0.21

0.48

0.32

0.46

Nickel (II)

mg/kg

0.39

0.28

0.58

0.36

0.37

Mercury

mg/kg

Not detected out

Benzene and its derivatives

mg/m2

Not detected out

Toluene

mg/m2

Not detected out

Ethylbenzene production

mg/m2

Not detected out

Acetic acid n-butyl ester

mg/m2

Not detected out

Xylene

mg/m²

Not detected out

Note: the heavy metal test method refers to YC/T316-2014; volatile material testing methods were referenced YC/T207-.

3) Chloroform extract detection, test method: reference is made to US FDA 21 CFR 176.170, as shown in table 4.

TABLE 4 chloroform extract test results

Common simulation liquid	Time	Temperature of	Maximum allowable limit value	Chloroform-soluble extracts of 10 samples of examples 1 to 11
					Distilled water	24.00hr（s）	120°F	0.5mg/inch²	Are all made of<0.1mg/inch²
N-heptane	0.50hr（s）	70°F	0.5mg/inch²	Are all made of<0.1mg/inch²
					8% ethanol	24.00hr（s）	120°F	0.5mg/inch²	Are all made of<0.1mg/inch²
50% ethanol	24.00hr（s）	120°F	0.5mg/inch²	Are all made of<0.1mg/inch²

4) The fluorescent substance, formaldehyde, total migration and potassium permanganate consumption were measured as shown in table 5.

TABLE 5 results of detection of fluorescent substances, formaldehyde, total migration and potassium permanganate consumption

Note: reference to GB 31604.47-2016 for fluorescent substance test methods; according to the formaldehyde test method, GB 31604.48-2016 is referred, the limit value is '1.0', the report limit is '0.06', and ND is 'undetected'; the method for measuring the total migration amount is described in table 6 with reference to GB 31604.8-2016; the method for testing the potassium permanganate consumption is as shown in table 7 with reference to GB 4806.8-2016.

TABLE 6 Total migration test method

Simulated liquid	Time	Temperature of	Limit value	Reporting limits
					Distilled water	240.0hr（s）	40℃	10	3.0
10% ethanol	40.0hr（s）	240℃	10	3.0

TABLE 7 potassium permanganate consumption testing method

Simulated liquid	Time	Temperature of	Limit value	Reporting limits
					Distilled water	2.0hr（s）	60℃	40	1.0

5) The test method of the acute oral toxicity test refers to the test method of the acute oral toxicity of GB/T21603-.

The test system comprises: ICR mice, SPF grade;

100 males, 20-23 g; 100 females, 20-24 g (10 females/males used in each example).

Breeding unit: beijing Huafukang Biotechnology GmbH (SCXK (Jing) 2014-.

Animal certification number: 11401300089815.

a breeding environment: the temperature is 21.2-24.4 ℃, and the average daily temperature difference is less than or equal to 3.2 ℃; the relative humidity is 36.7-61.9%.

The types of the feed are as follows: cobalt⁶⁰Radiation sterilization rat complete pellet feed.

The feed source is as follows: beijing Huafukang Biotechnology GmbH (SCXK (Jing) 2014-.

Certificate number: 1103221800001799.

the test method comprises the following steps:

sample preparation: soaking in pure water at 60 deg.C for 2 hr. The ratio of the surface area of the leaching medium to the surface area of the test object is 1cm²The area was immersed in 2mL of the immersion solution. The extraction stock solution is used as a sample and pure water is used as a solvent to prepare a sample solution with the concentration of 250 mg/mL. The test sample is placed at normal temperature in the sample feeding process, and the sample feeding process does not exceed half a day.

And (3) experimental design:

using the limit test method, 20 ICR mice were used per sample, each half of which was female and male, and a 5000mg/kg · bw dose group was set. Animals were given test samples by oral gavage after overnight fasting, closely observed for 4 hours, and observed for toxicity performance in mice 14 days after sample administration. CO for surviving animals at the end of the experiment₂Sacrifice, and gross anatomy and visual observation of pathological changes of tissues and organs.

Sample administration route and method: a syringe with a gavage needle is used for oral gavage sample feeding (0.2 mL/10g · bw), and the sample feeding time is in the morning.

And (3) clinical observation: the observation was performed 1 time a day for 14 days.

And (3) measuring the body weight: the observation period was measured 1 time per week.

And (3) pathological examination: all test animals were subjected to gross necropsy.

And (3) test results:

clinical signs: after administration, both males and females were observed to have significant signs of toxicity associated with administration, and no mortality occurred during the observation period.

A change in body weight; the body weights of the animals in each group were not significantly abnormal on day 0, 7 and 14 of infection.

Gross pathology examination results: at the end of the observation period of 14 days, the surviving animals were generally not significantly abnormal by necropsy.

And (4) test conclusion:

in 10 samples in the examples 1-10, under the test condition, the ICR mice are gavaged to test sample paper mouth stick base paper at the dose of 5000mg/kg body weight, and male and female mice do not die and have obvious toxicity. The test substance is used for acute oral administration of half Lethal Dose (LD) of ICR mice₅₀) Both female and male>5000mg/kg body weight.

In conclusion, the filter tip paper is made by using PLA fibers through a wet method, the adopted fiber raw materials are degradable, the environment is protected, the vitrification temperature is low, and the cooling effect is good; the process is simple and easy to implement, the cost is low, the production efficiency is high, the obtained filter tip paper is easy to process and form, all indexes are uniform, the quality stability is good, and the good cooling effect is achieved.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for manufacturing filter tip paper by using PLA fiber wet process is characterized in that: the method comprises the following steps:

(1) pulping the fiber raw material containing polylactic acid; the fiber raw material containing polylactic acid comprises the following components in parts by weight: 0-50 parts of bleached softwood pulp, 0-30 parts of unbleached softwood pulp, 0-40 parts of hemp pulp, 10-85 parts of polylactic acid fiber, 0-30 parts of polyethylene terephthalate and 0-5 parts of polyvinyl alcohol; the raw materials contain at least one of bleached softwood pulp, unbleached softwood pulp and hemp pulp, and at least one of polyethylene terephthalate and polyvinyl alcohol; the length of the polylactic acid fiber is 3-6 mm, and the thickness is 1.1-1.7 dt; the control parameters of the pulping treatment are as follows: the pulping concentration of the wood pulp and the hemp pulp is 2.0-5.0%, and the pulping degree is 10-45 DEG SR;

(3) and sequentially coiling and cutting the dry paper to obtain the paper.

2. The method for making the filter plug paper by using the PLA fiber wet process according to the claim 1, which is characterized in that: the length of the polyethylene terephthalate is 3-6 mm, and the thickness is 1.1-1.7 dt.

3. The method for making the filter plug paper by using the PLA fiber wet process according to the claim 1, which is characterized in that: the polyvinyl alcohol has a length of 3-6 mm and a thickness of 1.1-1.7 dt.

4. The method for making the filter plug paper by using the PLA fiber wet process according to the claim 1, which is characterized in that: the auxiliary agent comprises one or more of polyacrylamide, polyethylene oxide, reinforcing agent, defoaming agent and foam inhibitor.

5. The method for making the filter plug paper by using the PLA fiber wet process according to the claim 1, which is characterized in that: the control parameters of the online forming processing are as follows: the concentration of the upper net is 0.02-0.08%, and the water content of the paper outlet part is 80-90%.

6. The method for making the filter plug paper by using the PLA fiber wet process according to the claim 1, which is characterized in that: the temperature of the drying treatment is 70-130 ℃.

7. A filter tip paper, its characterized in that: the filter tip paper is manufactured by the method for manufacturing the filter tip paper by the paper of any one of claims 1 to 6.