CN103422252B - One can degradable dry-papermaking and preparation technology thereof and application - Google Patents
One can degradable dry-papermaking and preparation technology thereof and application Download PDFInfo
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Abstract
The present invention relates to one can degradable dry-papermaking and preparation technology thereof and application, this can degradable dry-papermaking structure composed as follows: ground floor is the first environmental protection layer, and this layer accounts for the always quantitative 15-50% of dry-papermaking; The second layer is the second environmental protection layer, can with ground floor fluid connection, this layer accounts for the always quantitative 10-40% of this dry-papermaking; Third layer is the 3rd environmental protection layer, can with second layer fluid connection, this layer accounts for the always quantitative 20-45% of this dry-papermaking; Described is quantitatively always the gross weight of ground floor to third layer.Product of the present invention instead of traditional adhesive solidification material by PLA/PLA composite fibre, environmentally safe, is the new no-dust paper of environmental protection; Utilize PLA fiber to have excellent UV resistant performance, make product have good UV resistant performance, extend the useful life of product; Adopt the production technology that the present invention relates to, with namely abandoning the effect playing good water conservancy diversion and absorbing fluid in paper for daily use product.
Description
Technical field
The invention belongs to airlaid dry pulp technology for making paper, be specifically related to a kind of new dry process paper of fully biodegradable.
Background technology
Airlaid dry paper technology, is also called airlaid nonwoven technology, is different from wet papermaking technology, in technical process substantially without water, does not produce environmentally harmful waste water, waste gas and waste residue etc., is a kind of production technology of comparatively environmental protection.Be with the wood pulp fibre of a few millimeters long for main raw material by the dust-free paper (also have and be called expanded core) of this explained hereafter, produced by air lay and different consolidation method.Utilize this technology, by the selection of raw material, the selection of proportioning and process route, can produce various different-thickness, different pliability, different hygroscopic material.Airlaid products is mainly used in disposable use and namely abandons paper for daily use product, as the absorbed layer of paper diaper, women sanitary articles, adult-incontinence articles, and guide layer etc. and wiping trial product etc.
According to the difference of bonding mode in production technology, dust-free paper can be divided into heat bonding, gummed and comprehensive Paper DryForming Technology, by water-absorbing material consolidations such as fine hair oar fibers together, obtains the product of different performance and purposes.Cementing material used is thermoplastic bicomponent fibers, polyethylene powders or water-soluble emulsion etc.But the high molecular polymer that these adhesive material go out by production and processing in petroleum chemicals, these petrochemicals really improve the living standard of people and are widely used, but its maximum problem is non-renewable and is difficult to degradation treatment, more be difficult to natural degradation, daily necessities discarded object containing these difficult degradation materials enters in our environment, brings severe contamination and harm to environment.In order to reduce the destruction to environment, break away from the dependence to day by day exhausted petroleum resources, exploitation sustainable use, environmental friendliness, degradable material have become current important topic and task.
The beginning of this century, people have developed acid fiber by polylactic (being called for short PLA), it is that one can completely biological (or nature) synthetic fiber of degrading, adopt the starch materials such as reproducible corn, cassava, through fermentation extracting lactic acid, then aggregate into resin, then make fiber by spinning, therefore also known as zein fiber.The most outstanding feature of PLA fiber is exactly have good biocompatibility and biological degradability, is degraded into CO2 and H2O gradually in vivo, to human non-toxic; Its discarded object is degraded into lactic acid, carbon dioxide and water automatically at occurring in nature, free from environmental pollution, and product can be generated starch and PLA fiber by plant photosynthesis does not produce noxious material when burning.Cellulose fibre comes from natural timber, cotton, and numb and careless class etc. are natural Green Polymer and renewable raw materials.Along with the continuous progress of technology, people have developed PLA/PLA composite fibre, be skin-core structure composite fibre, sandwich layer is that the PLA fiber that fusing point is higher (is generally about 170 DEG C, cortex is the PLA fiber (being generally about 130 DEG C) that fusing point is lower, and such composite fibre to make in replacement prior art conventional the composite fibre binding agent such as PE/PP or PE/PET of natural degradation to become possibility.The cortex of low melting point serves other material of fusing bonding that (is generally 130 ~ 160 DEG C) in the temperature range that conventional dust-free paper technique is used, and the not fusing and play skeletal support effect of sandwich layer high-melting fibre, makes the bulk that product keeps certain.
Although what have in prior art applies PLA fiber, be applied to disposable use and namely abandon in the manufacture of amenities and still there are some problems.As patent 202426733U discloses a kind of natural complete biodegradable disposable infant nappy, can not the material of natural degradation because adding other, as binding agent or water-absorbing resin etc., therefore the full natural degradation of 100% can not be called.
Summary of the invention
The object of the invention is the defect overcoming prior art, a kind of new dry process paper of real fully biodegradable is provided.
Of the present invention can degradable dry-papermaking be layer structure, and concrete structure is composed as follows:
Ground floor is the first environmental protection layer, comprise cellulose fiber peacekeeping PLA/PLA composite fibre, wherein cellulose fiber content is about the 60-85 quality % of this layer, and PLA/PLA composite fibre content is about the 15-40 quality % of this layer, and this layer accounts for the always quantitative 15-50% of this dry-papermaking;
The second layer is the second environmental protection layer, cellulose fiber peacekeeping PLA/PLA composite fibre can be comprised with ground floor fluid connection, wherein cellulose fiber content is about the 60-85 quality % of this layer, PLA/PLA composite fibre content is about the 15-40 quality % of this layer, and this layer accounts for the always quantitative 10-40% of this dry-papermaking;
Third layer is the 3rd environmental protection layer, cellulose fiber peacekeeping PLA/PLA composite fibre can be comprised with second layer fluid connection, wherein cellulose fiber content is about the 60-85 quality % of this layer, PLA/PLA composite fibre content is about the 15-40 quality % of this layer, and this layer accounts for the always quantitative 20-45% of this dry-papermaking.
Described is quantitatively always the gross weight of ground floor to third layer.
Described cellulose fibre comes from the natural plant fibres such as wood material completely, can complete biodegradable, it can be selected from the fiber and composition thereof through process or untreated Time of Fluff Slurry, softwood pulp, hardwood pulp, straw pulp, chemical pulp, chemi-mechanical pulp, heat engine slurry, its length is approximately 2-5mm, and has variform.
Described PLA/PLA composite fibre can be selected from the fiber be manually made up of the starch material such as corn or cassava, and length is about 4-6mm, and fiber number is about 1.5-6.7 dtex.
Of the present inventionly can play the effect etc. of imbibition and water conservancy diversion by degradable dry-papermaking in health product, the quantification range of dry-papermaking is 40g/m
2~ 600g/m
2.
This dry-papermaking product is by be arranged in order and some layers laminated together are formed, the cellulose fiber peacekeeping PLA/PLA composite fibre of each layer all containing different proportion.By heating, each layer is solidified togather, makes the dust-free paper product of different size.The material used because of this dust-free paper all comes from reproducible and can the raw material of degradable, do not add the raw material from petroleum chemicals that other conventional dust-free paper is used, so this dust-free paper can be degradable in natural environment, burning also can not produce noxious material, is a kind of real Green Product.Disposablely play the effect etc. of imbibition and water conservancy diversion in the product with in disposable paper for daily use product because dust-free paper is used in a large number, can completely the application of the dust-free paper of natural degradation greatly can reduce this kind of use and namely abandon the pollution of product to environment.Simultaneously PLA fiber has excellent UV resistant performance, and through scientific experiment, PLA fiber after 500 hours, still keep the brute force of 90%, and PET Exposure to Sunlight is after 200 hours through Exposure to Sunlight, and brute force is just down to about 60%, PP fiber also not UV resistant.And the composite fibre that existing manufacture dry-papermaking uses in a large number is as binding agent, widely used is PE/PP or PE/PET composite fibre, and UV resistant performance is poor.And apply the conventional composite fibre stick of PLA/PLA composite fibre replacement, product can be made to have good UV resistant performance, and product is more anti-aging, and namely powerful retentivity is in time good, can extend the useful life of product.
Another object of the present invention be to provide manufacture this can the technological process control of degradable dry-papermaking.The method is characterized in that and adopt advanced air-laid process, disposablely complete this composite.
This dust-free paper can dry method air forming technical equipment realize.Concrete steps are as follows:
(1) PLA/PLA composite fibre and cellulose fibre are sent to Homogeneous phase mixing in first moulded head, by air forming and vacuum draw effect, even shakedown drops on a guipure for no reason through the first moulded head to make this mixture, and shaping paper selectable use pony press carries out certain precompressed to initial stage composite;
(2) then this composite bed is delivered to second shaping area, by PLA/PLA composite fibre and cellulose fibre by Homogeneous phase mixing in second moulded head, falls on ground floor by air forming and vacuum draw paving;
(3) then enter the 3rd shaping area, PLA/PLA composite fibre, cellulose fibre by Homogeneous phase mixing in the 3rd horizontal screen mesh type moulded head and by air forming and vacuum draw effect paving fall on the second layer;
(4) then by the composite of above-mentioned formation by hot-pressing roller with further rock-steady structure, after selectable use one group of hot-pressing roller carries out thickness adjustment, this composite is sent in drying box and heats, baking and curing, continue after the compound dust-free paper after by solidification is delivered to another group selectable hot-pressing roller carries out thickness adjustment, to be undertaken wound into a roll by reel machine after the cooling of compound dust-free paper product;
(5) by demand, the product of required different in width is cut into cutting machine.
Of the present invention also relating to, can the purposes in disposable sanitary articles of degradable dry-papermaking, also can be used for other liquid absorption aspect, as adult-incontinence articles and baby paper diaper, wet tissue, cloth for wiping or dusting, food pad (fish pad, meat pad etc.), moisturizing (as facial mask) pet pads and filtering material etc.
Of the present invention can have following beneficial effect by degradable dry-papermaking:
(1) the product of the present invention degradable composite fibre selecting reproducible string and produced by reproducible plant amylum, traditional adhesive solidification material is instead of by PLA/PLA composite fibre, PLA fiber not only has certain sucting wet air permeability, its catabolite is carbon dioxide and water, can absorb by plant photosynthesis, again form starch, during burning, do not produce toxic gas, environmentally safe is the new no-dust paper of environmental protection.
(2) utilize PLA fiber to have excellent UV resistant performance, make product have good UV resistant performance, extend the useful life of product.
(3) adopt the production technology that the present invention relates to, due to each uniform component distribution, interlayer engages complete, and at sanitary napkin, protection pad, wiper, imbibition pad etc. are with namely abandoning the effect playing good water conservancy diversion and absorbing fluid in paper for daily use product.
Accompanying drawing explanation
Fig. 1 be of the present invention can the structural representation of degradable dry-papermaking.
Fig. 2 be of the present invention can the production technology schematic diagram of degradable dry-papermaking.
Wherein: a1 is the first environmental protection layer, a2 is the second environmental protection layer, and a3 is the 3rd environmental protection layer; B1 is cellulose fibre, and b2 is PLA/PLA fiber.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further described, but do not limit protection scope of the present invention.
The method of testing of fluid conducting material of the present invention is as follows:
1. thickness (normative reference: EDANA30.5-99)
Thickness: measure between plate at two, the distance measured under certain pressure (0.5kPa), unit is mm.
Tester: digital display type Thickness measuring instrument.
Carry out sampling, cutting sample according to the requirement of different product, on the edge of the specimen size of test and instrument, plate edge is not less than 5mm; Require constant temperature and humidity (23 ± 2 DEG C; Relative humidity 50% ± 5%) condition under, balance sample more than at least 4 hours.If for on-line real-time measuremen can not balance, but the temperature should recorded while carrying out measuring at that time and humidity, comparison for reference.
2. quantitatively (normative reference: EDANA40.3-90)
Quantitative: the quality of unit are is quantitative (grammes per square metre) of sample, and unit is g/m2.
Determining instrument: electronic balance (being accurate to 0.001 gram), is provided with screen and prevents air-flow and other disturbing factors on the impact of balance outside balance.
Sample requires constant temperature and humidity (23 ± 2 DEG C; Relative humidity 50% ± 5%) condition under, balance sample more than at least 4 hours.If be on-line real-time measuremen, can not balance, but the temperature should recorded while carrying out measuring at that time and humidity, comparison for reference.
Be placed on balance by mensuration sample, after the stable reading of balance, record weight, gram to represent.
Quantitatively (GSM)==A/B
Wherein: quantitative (grammes per square metre) of GSM-sample;
The weight of A-sample;
The area of B-sample.
3. tensile strength (normative reference: EDANA20.2-89)
Tensile strength: the sample of given size is subject to constant rate of extension to tension force required during fracture.
Determining instrument: Zwick2.5-strength tester
Sample is cut into the size of 200mmx25.4mm, requires constant temperature and humidity (23 ± 2 DEG C; Relative humidity 50 ± 5%) condition under, balance sample more than at least 4 hours, if be on-line real-time measuremen, can not to balance, but the temperature should write down while carrying out measuring at that time and humidity, comparison for reference.
According to following test parameter setting test program:
Maximum measuring range: 100N
Test speed: 254mm/min
Folder distance: 51mm
Clamp: 5bar
4. liquid permeation rate (normative reference: EDANA150.5-02)
Liquid permeation rate: when the 0.9% sodium chloride solution infiltration sample of 5m1, by circuit conductive recording liquid by the time, unit is second.
Determining instrument: Lister Liquid Penetrant instrument
5. liquid absorption capacity (EDANA10.4-02)
Liquid absorption capacity: after sample being soaked in a liquid 10 minutes certain hours, the percentage that gross weight increases is the absorbability of sample.
Embodiment 1
The present embodiment the total of degradable dry-papermaking quantitatively can be about 50g/m
2, thickness is about 1.0mm, and its concrete raw material is as follows: cellulose fibre chooses WeyerhauserNB416, and fiber is about 2-5mm, or GP4822 process oar; PLA/PLA composite fibre fiber number is 2.2dtex/6mm, and fibrocortex is about 130 DEG C, and sandwich layer is about 160 DEG C.
This compound dust-free paper structure comprises three layers, ground floor quantitatively account for product always quantitative 35%, the second layer quantitatively account for product always quantitative 35%, third layer quantitatively account for product always quantitative 30%.Shown in the following list 1 of each component distribution in layers.
Embodiment 2
The present embodiment the total of degradable dry-papermaking quantitatively can be about 80g/m
2, thickness is about 1.5mm, and its concrete raw material is as follows: cellulose fibre chooses WeyerhauserNB416, and fiber is about 2-5mm, or GP4822 process oar; PLA/PLA composite fibre fiber number is 2.2dtex/6mm, and fibrocortex is about 130 DEG C, and sandwich layer is about 160 DEG C.
This compound dust-free paper structure comprises three layers, ground floor quantitatively account for product always quantitative 30%, the second layer quantitatively account for product always quantitative 40%, third layer quantitatively account for product always quantitative 30%.Shown in the following list 2 of each component distribution in layers.
Embodiment 3
The present embodiment the total of degradable dry-papermaking quantitatively can be about 150g/m
2, thickness is about 2.0mm, and its concrete raw material is as follows: cellulose fibre chooses WeyerhauserNB416, and fiber is about 2-5mm, or GP4822 process oar; PLA/PLA composite fibre fiber number is 2.2dtex/6mm, and fibrocortex is about 130 DEG C, and sandwich layer is about 160 DEG C.
This compound dust-free paper structure comprises three layers, ground floor quantitatively account for product always quantitative 40%, the second layer quantitatively account for product always quantitative 35%, third layer quantitatively account for product always quantitative 25%.Shown in the following list 3 of each component distribution in layers.
In above embodiment can the preparation process of degradable dry-papermaking as follows:
This fluid conducting material realizes on horizontal screen mesh type forming technique equipment.
As Fig. 2, by PLA/PLA composite fibre, cellulose fibre is sent to Homogeneous phase mixing in first moulded head 1, by air forming and vacuum draw effect, even shakedown drops on a guipure for no reason through the first moulded head to make this mixture, and shaping paper selectable use pony press 2 pairs of initial stage composites carry out certain precompressed; Then this composite bed is delivered to second shaping area, by PLA/PLA composite fibre and cellulose fibre by Homogeneous phase mixing in second moulded head 3, fall on ground floor by air forming and vacuum draw paving, then the 3rd shaping area is entered, PLA/PLA composite fibre, cellulose fibre by Homogeneous phase mixing in the 3rd horizontal screen mesh type moulded head 4 and by air forming and vacuum draw effect paving fall on the second layer; Then the composite of above-mentioned formation is passed through hot-pressing roller 5 with further rock-steady structure, after selectable use one group of hot-pressing roller 6 carries out thickness adjustment, this composite is sent in drying box 7 and heats, baking and curing, continue after the compound dust-free paper after by solidification is delivered to another group selectable hot-pressing roller 8 carries out thickness adjustment, to be undertaken wound into a roll by reel machine 9 after the cooling of compound dust-free paper product.By demand, cut into the product of required different in width with cutting machine.The performance parameter testing result of each embodiment product is as shown in table 4 above:
Table 4
As can be seen from Table 4, in the embodiment of the present invention, the key property of each product all reaches the standard of the dust-free paper of prior art and manufacture of materials, has the effect of good water conservancy diversion and absorbing fluid.Integrated comparative, it is excellent that degradable dry-papermaking of the present invention also has environmental-protecting performance, and have good UV resistant performance, extends the useful life of product
Above preferred embodiment of the present invention has been described in detail, but described content being only preferred embodiment of the present invention, can not being considered to for limiting practical range of the present invention.All equalizations done according to the present patent application scope change and improve, and all should still belong within patent covering scope of the present invention.
Claims (6)
1. can a degradable dry-papermaking, it is characterized in that: its structure is composed as follows:
Ground floor is the first environmental protection layer, and this layer accounts for the always quantitative 15-50% of this dry-papermaking;
The second layer is the second environmental protection layer, can with ground floor fluid connection, this layer accounts for the always quantitative 10-40% of this dry-papermaking;
Third layer is the 3rd environmental protection layer, can with second layer fluid connection, this layer accounts for the always quantitative 20-45% of this dry-papermaking;
Described is quantitatively always the gross weight of ground floor to third layer;
Described first environmental protection layer comprises cellulose fiber peacekeeping PLA/PLA composite fibre, and wherein cellulose fiber content is the 60-85 quality % of this layer, and PLA/PLA composite fibre content is the 15-40 quality % of this layer;
Described second environmental protection layer comprises cellulose fiber peacekeeping PLA/PLA composite fibre, and wherein cellulose fiber content is the 60-85 quality % of this layer, and PLA/PLA composite fibre content is the 15-40 quality % of this layer;
Described 3rd environmental protection layer comprises cellulose fiber peacekeeping PLA/PLA composite fibre, and wherein cellulose fiber content is the 60-85 quality % of this layer, and PLA/PLA composite fibre content is the 15-40 quality % of this layer.
2. one according to claim 1 can degradable dry-papermaking, it is characterized in that: described cellulose fibre comes from wood material natural plant fibre completely, be selected from the fiber through process or untreated Time of Fluff Slurry, softwood pulp, hardwood pulp, straw pulp, chemical pulp, chemi-mechanical pulp, heat engine slurry or its mixture.
3. one according to claim 1 can degradable dry-papermaking, it is characterized in that: described PLA/PLA composite fibre is selected from the fiber be manually made up of corn or tapioca raw material.
4. one according to claim 1 can degradable dry-papermaking, it is characterized in that: can total quantification range of degradable dry-papermaking be 40g/m
2~ 600g/m
2.
5. a kind of described in any one of claim 1-4 can the preparation technology of degradable dry-papermaking, and it is characterized in that, concrete steps are as follows:
(1) PLA/PLA composite fibre and cellulose fibre are sent to Homogeneous phase mixing in first moulded head, by air forming and vacuum draw effect, even shakedown drops on a guipure for no reason through the first moulded head to make this mixture, and shaping paper uses pony press to carry out certain precompressed to initial stage composite;
(2) then the composite that step (1) is formed is delivered to second shaping area, by PLA/PLA composite fibre and cellulose fibre by Homogeneous phase mixing in second moulded head, falls on ground floor by air forming and vacuum draw paving;
(3) then enter the 3rd shaping area, PLA/PLA composite fibre, cellulose fibre by Homogeneous phase mixing in the 3rd horizontal screen mesh type moulded head and by air forming and vacuum draw effect paving fall on the second layer;
(4) composite then step (3) formed by hot-pressing roller with further rock-steady structure, after using one group of hot-pressing roller to carry out thickness adjustment, this composite is sent in drying box and heats, baking and curing, continue after the composite after by solidification is delivered to another group selectable hot-pressing roller carries out thickness adjustment, to be undertaken wound into a roll by reel machine after the cooling of compound dust-free paper product;
(5) by demand, the product of required different in width is cut into cutting machine.
6. a kind of described in any one of claim 1-4 can the application of degradable dry-papermaking, it is characterized in that, described degradable dry-papermaking in disposable sanitary articles and other liquid absorption in purposes.
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| CN114161783A (en) * | 2017-04-26 | 2022-03-11 | 博爱（中国）膨化芯材有限公司 | Thermal composite rapid-infiltration flow guide material and application thereof |
| CN109229960A (en) * | 2018-09-06 | 2019-01-18 | 金旭环保制品（深圳）有限公司 | A kind of new material wet tissue |
| CN111267454A (en) * | 2020-04-22 | 2020-06-12 | 南通烟滤嘴有限责任公司 | Hot-pressing composite non-woven paper and filter element for cigarettes |
| CN111441192A (en) * | 2020-04-22 | 2020-07-24 | 南通烟滤嘴有限责任公司 | Degradable composite non-woven paper and paper product for cigarettes |
| CN112900128B (en) * | 2021-02-09 | 2023-07-04 | 马兆旭 | Production process of paper and tableware |
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