CN102877355B - Polylactic acid forming paper and preparation method - Google Patents
Polylactic acid forming paper and preparation method Download PDFInfo
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- CN102877355B CN102877355B CN201210428363.6A CN201210428363A CN102877355B CN 102877355 B CN102877355 B CN 102877355B CN 201210428363 A CN201210428363 A CN 201210428363A CN 102877355 B CN102877355 B CN 102877355B
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Abstract
The invention provides polylactic acid forming paper adopting polylatic acid fibers as a raw material and a preparation method thereof so as to solve the vices of hair slip and powder drop of the conventional forming paper and reduce excessive consumption of production of the conventional forming paper on resources to a certain extent. The invention adopts the following technical means: the polylactic acid forming paper comprises the following components in parts by weight: 15-65 parts of polylactic acid fibers, 15-20 parts of hardwood fibers with whiteness of 80-85% and 10-15 parts of polyester fibers, wherein the polylactic fibers are 4-6 mm long, and the fineness is 1-5 D; the polyester fibers are 4-10 mm long and the fineness is 0.5-1.4 D; the ratio of the forming paper is 10-50 g and the air permeability is 500-50000 um/pa.s.
Description
Technical field
The application relates to the preparation field of Cigarette paper, specifically belongs to forming paper preparation field.
Background technology
Forming paper belongs to the extraordinary stationery of industrial thin, the auxiliary material of cigarette, be mainly used in tobacco business cigarette filter and wrap up tow, then by tipping paper by cigarette with filter stick is bonding namely becomes cigarette with filter tip, the Main Function of filter stick shaping paper is: coated tow, filtration dilute main flume, improve taste, reduces cigarette to the harm of human body.
Existing forming paper is the same with common paper industry, raw materials used mainly lumber fibre, larger to the consumption of the forest reserves, along with market is to the swift and violent increase of high-quality and high-grade demand for paper products, very fast to the demand growth of wood pulp, supply falls short of demand for internal sources, has to depend on import in a large number.In recent years; in Chinas paper industry raw material; although rise to some extent to this consumption ratio of wood pulp; but compared with the wood pulp mean consumption 94% of international developed country paper industry; still there is larger gap, its main cause is Chinese forest scarcity of resources, and timber resources flows to abroad continuously in recent years; not only constrain the sound development of Chinas paper industry, also increase the weight of the burden of environmental protection aspect simultaneously.The afforestation rate of current China is only equivalent to 61.3% of world average level, and it is of low quality, age-area structure is unreasonable, and paper-making industry is timber use rich and influential family, in the forest reserves that the world consumes every year, have 40% for papermaking, and China at present paper grade (stock) material only account for China consume 6.7% of the forest reserves, it is under-supply that this not only result in domestic wood pulp, and directly affects the adjustment of papermaking material structure and the raising of paper product quality.Though adopt waste paper to substitute log starch the present situation alleviating insufficient raw material as paper making raw material to a certain extent, but because waste paper reclaims the reasons such as site few, that unit take-back cost is too low and waste paper can produce economic benefit is not obvious, fundamentally can not solve the problem of paper pulp raw material deficiency, so a large amount of dependence on import of having to.
For solving these contradiction, under the prerequisite meeting the requirement of paper Special use, actively seeking safety, wide material sources, the rational forming paper feedstock alternative of cost ensure and one of important process promoting cigarette industry stable development.
Except there is the underlying issue of above-mentioned common paper industry, due to the particularity that it uses field, also there is following problem in existing forming paper.
Hair and powder dropping phenomenon, commonly to show as: to come off lower fiber fines, chip, filler grain and sizing agent etc. from paper or edge under the effect of mechanical force, this phenomenon will be produced when the surface tension of paper is less than external mechanical active force, that is, falling hair is that single fiber splits away off from paper; Dry linting is that paper is rubbing, bends, impacting or under vibration, fiber fines chip and filler grain etc. split away off from paper or edge.Along with the raising of filter stick formation motor speed in actual production, filter stick shaping paper hair and powder dropping phenomenon is more and more outstanding, and its reason mainly contains following:
1. raw-material impact: existing forming paper normally adopts the string of paper grade (stock) to prepare, in order to improve adhesion between paper fibre, make the tensile strength of paper and bursting strength better, long fiber that cell membrane is thinner can be selected as raw material, it is in making beating and to become in paper process that fiber is easily flat to collapse, thus between fiber and fiber, form larger contact surface, during paper page drying position, the bond strength of fiber is all right, this means that this fiber easily makes the surface area of fiber increase when pulling an oar, thus the bond strength of fiber also just increases, therefore, increase ratio of long fiber to be conducive to reducing hair and powder dropping phenomenon, but long fiber too much can affect again the flatness of paper, the pi of filter stick and bond properties is caused to reduce, how to carry out reasonable balance be always forming paper manufacture in a difficult problem.
2. the impact of filler: filler be produce filter stick shaping paper important auxiliary material it, its tensile strength to filter stick shaping paper, the surface property of paper, and the sticky mouth quality of rolled filter rod all has a significant impact, normally used filler is calcium carbonate, kaolin etc.Because fillers dispersed is between fiber, hinder the close to each other of fiber, decrease connection mutual between fiber, decrease interfibrous relative bonded area, cause the reduction of fibrous binding force, thus the physical strength of paper is declined, cause dry linting phenomenon.
3. the impact of bake out temperature: when l Water Paper page enters drying process, temperature is too high easily makes fibres fasten, destroys the surface strength of page, causes the wildness of paper, cause hair and powder dropping.
The main performance that forming paper is applied in cigarette is air permeability, this directly has influence on suction quality and the flue gas mouthfeel of cigarette, the change of air permeability directly can affect again anti-tensile and the tearing strength of forming paper, so, for ensureing that filter stick shaping paper can even running on high-energy-rate forming machine, air permeability or intensity index can not be pursued merely, and the uniformity of view picture should be focused on, prevent the coefficient of variation of intensity index excessive, when causing machine to run, appear at the problem of minimum of intensity place fracture.
Summary of the invention
For solving the defect of traditional forming paper hair and powder dropping, and alleviating traditional forming paper production consuming excessively resource to a certain extent, the object of the present invention is to provide a kind of acid fiber by polylactic that adopts as forming paper of raw material and preparation method thereof.
For achieving the above object, the present invention adopts following technological means: acid fiber by polylactic forming paper, it is characterized in that, calculate according to parts by weight, containing acid fiber by polylactic 15-65 part, whiteness is broad-leaved wood fiber 15-20 part of 80-85%, polyester fiber 10-15 part, the length of described acid fiber by polylactic is 4-6mm, and fiber number is 1-5D; The length of described polyester fiber is 4-10mm, and fiber number is 0.5-1.4D; The quantitative of described forming paper is 10-50g, and air permeability is 500-50000um/pas.
For improving air permeability and the retention function of forming paper, in described forming paper, add the guar gum of 0.05-0.15 part.
For improving the suppleness of forming paper, in described forming paper, add 0.05-0.10 part polyacrylamide.
The preparation method of acid fiber by polylactic forming paper, comprise material preparation technology, paper machine design technology, paper machine parameter adjusting process and field control, is characterized in that, the concrete steps of described material preparation technology are:
1. specification is selected to be: acid fiber by polylactic 15-65 part of 1-5D × 4-6mm, trough-style pulp beater is adopted to carry out free beating, beating consistency is 1-2%, gradation is pulled an oar, first after adopting the beating pressure making beating 5-10min of 5-7kg, pull an oar under changing beating pressure 2-3kg again into 50-60min, and beating degree is 9-12 ° of SR, weight in wet base 6-8g;
2. whiteness is 80-85%, fibre length is hardwood pulp 15-20 part of 0.8-2.0mm, and adopt shiny beating, beating degree is 40 ~ 50 ° of SR, weight in wet base 6-8g;
3. add polyester fiber 10-15 part by after above-mentioned acid fiber slurries and hardwood pulp mixing, mix and make suspension paper pulp;
4. oblique net paper machine is used to manufacture paper with pulp;
5. use vacuum furnace and pressure roller to squeeze, l Water Paper page out contains 80% moisture, and by regulating the speed difference of press section and wet end l Water Paper page at longitudinal stretching, make fiber be longitudinal arrangement, the hole between fiber, in longitudinally, improves air permeability;
6. use the cylinder group of single net single cylinder to carry out drying, start the temperature of two drying cylinders at 70-75 DEG C, detect paper web mass dryness fraction afterwards, mass dryness fraction more than 50% after, the temperature of follow-up drying cylinder is adjusted to 80-85 DEG C, until reach instructions for use.
For enhancing productivity, step 1. in adopt the beating pressure making beating 60-70min of 4-5kg when acid fiber by polylactic is pulled an oar, be 11 ° of SR to beating degree.
beneficial effect of the present invention is:
A, the present invention take full advantage of that acid fiber by polylactic compatibility is good, the good feature of the characteristic of safety non-toxic, nonirritant, ru nnability, with its main raw material as forming paper, replace existing forming paper and use wood pulp in a large number, the consumption to timber resources can be reduced, due to it, there is biological degradability simultaneously, the impact on environment can be reduced.
Between the paper fibre of b, forming paper of the present invention, adhesion is strong, tensile strength and the bursting strength of paper are better, bond strength between acid fiber by polylactic and polyester fiber is good, be conducive to reducing hair and powder dropping phenomenon, and with the addition of the short fiber string of proper ratio, for improving the flatness of paper, improve pi and the bond properties of filter stick.
When c, forming paper of the present invention carry out drying in preparation, by controlling the gradient of front middle and later periods dryer temperature, and carry out temperature adjustment according to the real-time testing result to paper mass dryness fraction, when can effectively prevent l Water Paper page from entering drying process, temperature is too high easily makes fibres fasten, destroy the surface strength of page, cause the wildness of paper, cause the problem of hair and powder dropping.
D, due to acid fiber by polylactic, in paper technology, not addition is The more the better, although acid fiber by polylactic increases, be conducive to the air permeability improving forming paper, but the tensile index of paper can be reduced, tear index and folding strength, so the addition of acid fiber by polylactic is controlled in certain limit in the present invention, make the air permeability of forming paper and requirement of strength comparatively even, ensure under the prerequisite meeting air permeability of cigarette energy, can even running on high-energy-rate forming machine, prevent the coefficient of variation of intensity index excessive, causing in actual production occurs rupturing waits the normal problem of producing of impact.
Detailed description of the invention
embodiment 1
Acid fiber by polylactic forming paper described in the present embodiment, calculate according to parts by weight, containing acid fiber by polylactic 15 parts, whiteness is the broad-leaved wood fiber 15 parts of 80%, 10 parts, polyester fiber, and the length of described acid fiber by polylactic is 4mm, and fiber number is 1D; The length of described polyester fiber is 4mm, and fiber number is 0.5D, and adds the guar gum of 0.05 part.Its preparation method comprises material preparation technology, paper machine design technology, paper machine parameter adjusting process and field control, and the concrete steps of described material preparation technology are:
1. select the acid fiber by polylactic 15 parts of above-mentioned specification, adopt trough-style pulp beater to carry out free beating, beating consistency is 1%, after first adopting the beating pressure making beating 10min of 5kg, then the 60min that pulls an oar under changing beating pressure 2kg into, beating degree is 9 ° of SR, weight in wet base 8g;
2. select the hardwood pulp 15 parts of above-mentioned specification, adopt shiny beating, beating degree is 40 ° of SR, weight in wet base 6g;
3. add 10 parts, polyester fiber by after above-mentioned acid fiber by polylactic slurries and hardwood pulp mixing, interpolation guar gum mixes makes suspension paper pulp;
4. oblique net paper machine is used to manufacture paper with pulp;
5. use vacuum furnace and pressure roller to squeeze, l Water Paper page out contains 80% moisture, and by regulating the speed difference of press section and wet end l Water Paper page at longitudinal stretching, make fiber be longitudinal arrangement, the hole between fiber, in longitudinally, improves air permeability;
6. use the cylinder group of single net single cylinder to carry out drying, start the temperature of two drying cylinders at 70 DEG C, detect paper web mass dryness fraction afterwards, mass dryness fraction more than 50% after, the temperature of follow-up drying cylinder is adjusted to 80 DEG C, until reach instructions for use.
The quantitative of described forming paper is 10g, and air permeability is 500um/pas.
embodiment 2
Acid fiber by polylactic forming paper described in the present embodiment, calculate according to parts by weight, containing acid fiber by polylactic 65 parts, whiteness is the broad-leaved wood fiber 20 parts of 85%, 15 parts, polyester fiber, and the length of described acid fiber by polylactic is 6mm, and fiber number is 5D; The length of described polyester fiber is 10mm, and fiber number is 1.4D, and adds 0.10 part of polyacrylamide.Its preparation method comprises material preparation technology, paper machine design technology, paper machine parameter adjusting process and field control, and the concrete steps of described material preparation technology are:
1. select the acid fiber by polylactic 65 parts of above-mentioned specification, adopt trough-style pulp beater to carry out free beating, using the making beating power making beating 70min of 4kg, is 11 ° of SR weight in wet base 8g to beating degree;
2. select the hardwood pulp 20 parts of above-mentioned specification, adopt shiny beating, beating degree is 50 ° of SR, weight in wet base 8g;
3. add 15 parts, polyester fiber by after above-mentioned acid fiber by polylactic slurries and hardwood pulp mixing, interpolation polyacrylamide mixes makes suspension paper pulp;
4. oblique net paper machine is used to manufacture paper with pulp;
5. use vacuum furnace and pressure roller to squeeze, l Water Paper page out contains 80% moisture, and by regulating the speed difference of press section and wet end l Water Paper page at longitudinal stretching, make fiber be longitudinal arrangement, the hole between fiber, in longitudinally, improves air permeability;
6. use the cylinder group of single net single cylinder to carry out drying, start the temperature of two drying cylinders at 75 DEG C, detect paper web mass dryness fraction afterwards, mass dryness fraction more than 50% after, the temperature of follow-up drying cylinder is adjusted to 85 DEG C, until reach instructions for use.
The quantitative of described forming paper is 50g, and air permeability is 50000um/pas.
embodiment 3
Acid fiber by polylactic forming paper described in the present embodiment, calculate according to parts by weight, containing acid fiber by polylactic 30 parts, whiteness is the broad-leaved wood fiber 18 parts of 85%, 13 parts, polyester fiber, and the length of described acid fiber by polylactic is 5mm, and fiber number is 3D; The length of described polyester fiber is 7mm, and fiber number is 1.0D, and adds the guar gum of 0.10 part of polyacrylamide and 0.10 part.Its preparation method comprises material preparation technology, paper machine design technology, paper machine parameter adjusting process and field control, and the concrete steps of described material preparation technology are:
1. select the acid fiber by polylactic 30 parts of above-mentioned specification, adopt trough-style pulp beater to carry out free beating, using the making beating power making beating 60min of 5kg, is 11 ° of SR weight in wet base 8g to beating degree;
2. select the hardwood pulp 18 parts of above-mentioned specification, adopt shiny beating, beating degree is 40 ° of SR, weight in wet base 8g;
3. by above-mentioned acid fiber slurries and hardwood pulp mixing after add 13 parts, polyester fiber, be added into polyacrylamide and guar gum, mix and make suspension paper pulp;
4. oblique net paper machine is used to manufacture paper with pulp;
5. use vacuum furnace and pressure roller to squeeze, l Water Paper page out contains 80% moisture, and by regulating the speed difference of press section and wet end l Water Paper page at longitudinal stretching, make fiber be longitudinal arrangement, the hole between fiber, in longitudinally, improves air permeability;
6. use the cylinder group of single net single cylinder to carry out drying, start the temperature of two drying cylinders at 75 DEG C, detect paper web mass dryness fraction afterwards, mass dryness fraction more than 50% after, the temperature of follow-up drying cylinder is adjusted to 85 DEG C, until reach instructions for use.
The quantitative of described forming paper is 30g, and air permeability is 8000um/pas.
Claims (4)
1. acid fiber by polylactic forming paper, is characterized in that, calculate according to parts by weight, containing acid fiber by polylactic 30-65 part, whiteness is broad-leaved wood fiber 15-20 part of 80-85%, polyester fiber 10-15 part; The length of described acid fiber by polylactic is 4-6mm, and fiber number is 1-5D; The length of described polyester fiber is 4-10mm, and fiber number is 0.5-1.4D; The quantitative of described forming paper is 10-50g, and air permeability is 500-50000um/pas;
Preparation method comprises material preparation technology, paper machine design technology, paper machine parameter adjusting process and field control, and the concrete steps of described material preparation technology are:
1. specification is selected to be: acid fiber by polylactic 30-65 part of 1-5D × 4-6mm, trough-style pulp beater is adopted to carry out free beating, beating consistency is 1-2%, first after adopting the beating pressure making beating 5-10min of 5-7kg, pull an oar under changing beating pressure 2-3kg again into 50-60min, beating degree is 9-12 ° of SR, weight in wet base 6-8g;
2. whiteness is 80-85%, fibre length is hardwood pulp 15-20 part of 0.8-2.0mm, and adopt shiny beating, beating degree is 40 ~ 50 ° of SR, weight in wet base 6-8g;
3. add polyester fiber 10-15 part by after above-mentioned acid fiber by polylactic slurries and hardwood pulp mixing, mix and make suspension paper pulp;
4. oblique net paper machine is used to manufacture paper with pulp;
5. use vacuum furnace and pressure roller to squeeze, l Water Paper page out contains 80% moisture, and by regulating the speed difference of press section and wet end l Water Paper page at longitudinal stretching, make fiber be longitudinal arrangement, the hole between fiber, in longitudinally, improves air permeability;
6. use the cylinder group of single net single cylinder to carry out drying, start the temperature of two drying cylinders at 70-75 DEG C, detect paper web mass dryness fraction afterwards, mass dryness fraction more than 50% after, the temperature of follow-up drying cylinder is adjusted to 80-85 DEG C, until reach instructions for use.
2. acid fiber by polylactic forming paper according to claim 1, is characterized in that, calculates, add the guar gum of 0.05-0.15 part in described forming paper according to parts by weight.
3. acid fiber by polylactic forming paper according to claim 1, is characterized in that, calculates, add 0.05-0.10 part polyacrylamide in described forming paper according to parts by weight.
4. the acid fiber by polylactic forming paper according to any one of claims 1 to 3, is characterized in that, above-mentioned steps 1. in adopt when acid fiber by polylactic is pulled an oar and once pull an oar, using the beating pressure making beating 60-70min of 4-5kg, is 11 ° of SR to beating degree.
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