CN103422252A - Dry paper capable of being degraded completely and preparing technology and application thereof - Google Patents
Dry paper capable of being degraded completely and preparing technology and application thereof Download PDFInfo
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- CN103422252A CN103422252A CN2013103238835A CN201310323883A CN103422252A CN 103422252 A CN103422252 A CN 103422252A CN 2013103238835 A CN2013103238835 A CN 2013103238835A CN 201310323883 A CN201310323883 A CN 201310323883A CN 103422252 A CN103422252 A CN 103422252A
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Abstract
The invention relates to dry paper capable of being degraded completely and the preparing technology and application of the dry paper. The dry paper capable of being degraded completely structurally comprises a first layer, a second layer and a third layer. The first layer is a first environment-friendly layer, and accounts for 15-50% of the total quantification of the dry paper. The second layer is a second environment-friendly layer, can be communicated with liquid in the first layer, and accounts for 10-40% of the total quantification of the dry paper. The third layer is a third environment-friendly layer, can be communicated with liquid in the second layer, and accounts for 20-45% of the total quantification of the dry paper. The total quantification is the total weight of the first layer, the second layer and the third layer. According to the dry paper capable of being degraded completely, a traditional bonding solidification material is replaced by PLA/PLA complex fiber, and the dry paper does not pollute the environment and is environment-friendly and novel dust-free paper. The PLA fiber has superior ultraviolet light resisting performance, so that the dry paper has good ultraviolet light resisting performance, and the service life of the dry paper is prolonged. The processing technology related to the dry paper plays a very good role in guiding and absorbing liquid of disposable household paper products.
Description
Technical field
The invention belongs to air lay Paper DryForming Technology field, be specifically related to a kind of new dry process paper of fully biodegradable.
Background technology
The air lay Paper DryForming Technology, also be called the air lay nonwoven techniques, is different from the wet papermaking technology, at technical process water not substantially, do not produce environmentally harmful waste water, and waste gas and waste residue etc., be a kind of production technology of comparatively environmental protection.Be that to take the wood pulp fibre of several millimeters long be main raw material by the dust-free paper (also have and be called expanded core) of this explained hereafter, produce 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.The air lay product is mainly used in disposable use and abandons the paper for daily use product, as the absorbed layer of paper diaper, women sanitary articles, adult-incontinence articles, guide layer etc. with wipe 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, and the water-absorbing materials such as fine hair oar fiber is together fixed, 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 have really improved people's living standard and have been widely used, but its maximum problem is non-renewable and is difficult to degradation treatment, more be difficult to natural degradation, the daily necessities discarded object that contains these difficult degradation materials enters in our environment, and environment has been brought to severe contamination and harm.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 the synthetic fiber of a kind of biology fully (or nature) degraded, to adopt the starch materials such as reproducible corn, cassava, through the fermentation obtain lactic acid, then aggregate into resin, then make fiber by spinning, therefore claim again zein fiber.The most outstanding characteristics of PLA fiber are exactly to have good biocompatibility and biological degradability, are degraded into gradually in vivo CO2 and H2O, nontoxic to human body; 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 by the plant photosynthesis and the PLA fiber does not produce noxious material when burning.Cellulose fibre is to come from natural timber, cotton, and numb and careless class etc., be natural Green Polymer and renewable raw materials.Continuous progress along with technology, people have developed the PLA/PLA composite fibre, be the skin-core structure composite fibre, sandwich layer is that the PLA fiber that fusing point is higher (is generally 170 ℃ of left and right, cortex is the PLA fiber that fusing point is lower (being generally 130 ℃ of left and right), and such composite fibre makes to replace in prior art commonly used PE/PP or the composite fibre binding agent such as PE/PET that can not natural degradation becomes possibility.The cortex of low melting point has played in the temperature range used in conventional dust-free paper technique other material of fusing bonding that (is generally 130～160 ℃), and the not fusing and play the skeleton supporting role of sandwich layer high-melting fibre, make product keep certain bulk.
Although what have in prior art has applied the PLA fiber, is applied to disposable use and abandons in the manufacture of amenities some problems that still exist.As patent 202426733U discloses a kind of natural complete biodegradable disposable infant nappy, because having added the material that other can not natural degradation, as binding agent or water-absorbing resin etc., therefore can not be called 100% full natural degradation.
Summary of the invention
The objective of the invention is to overcome the defect of prior art, a kind of new dry process paper of real fully biodegradable is provided.
But degradable dry-papermaking of the present invention is 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 total quantitative 15-50% of this dry-papermaking;
The second layer is the second environmental protection layer, can and comprise cellulose fiber peacekeeping PLA/PLA composite fibre with the 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 total quantitative 10-40% of this dry-papermaking;
The 3rd layer is the 3rd environmental protection layer, can and comprise cellulose fiber peacekeeping PLA/PLA composite fibre 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 total quantitative 20-45% of this dry-papermaking.
Described is quantitatively always the gross weight of three layers of ground floors to the.
Described cellulose fibre comes from the natural plant fibres such as wood material fully, can complete biodegradable, it can be selected from through processing or the fiber of untreated Time of Fluff Slurry, softwood pulp, hardwood pulp, straw pulp, chemical pulp, chemi-mechanical pulp, heat engine slurry and composition thereof, its length is approximately 2-5mm, and has variform.
The fiber that described PLA/PLA composite fibre can select the starch materials such as free corn or cassava manually to make, the about 4-6mm of length, fiber number is about the 1.5-6.7 dtex.
But degradable dry-papermaking of the present invention plays the effect of imbibition and water conservancy diversion etc. in health product, and the quantitative scope of dry-papermaking is 40g/m
2～600g/m
2.
This dry-papermaking product is by being arranged in order and some layers laminated together form, and each layer all contains the cellulose fiber peacekeeping PLA/PLA composite fibre of different proportion.By heating, each layer is solidified togather, makes the dust-free paper product of different size.But the material used because of this dust-free paper all comes from reproducible and raw material degradable, do not add other conventional dust-free paper raw material from petroleum chemicals 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.Because dust-free paper is used in the disposable paper for daily use product of disposable use in a large number, play the effect of imbibition and water conservancy diversion etc. in product, the application of the dust-free paper of natural degradation can reduce this class greatly with abandoning the pollution of product to environment fully.Simultaneously the PLA fiber has good UV resistant performance, and through scientific experiment, the PLA fiber after 500 hours, still keeps 90% brute force through Exposure to Sunlight, and the Exposure to Sunlight of PET fiber is after 200 hours, and brute force just is down to 60% left and right, and the PP fiber is UV resistant not also.Manufacture a large amount of composite fibres that use of dry-papermaking as binding agent and have now, widely used is PE/PP or PE/PET composite fibre, and the UV resistant performance is poor.And application PLA/PLA composite fibre replaces conventional composite fibre stick, can make product that UV resistant performance is preferably arranged, product is more anti-aging, and powerful retentivity in time is good, the useful life that can extend product.
But another object of the present invention is to provide technique and the method for manufacturing this degradable dry-papermaking.The method is characterized in that and adopt advanced air-laid process, disposable this composite that completes.
This dust-free paper can be realized on dry method air forming technical equipment.Concrete steps are as follows:
(1) PLA/PLA composite fibre and cellulose fibre are sent to evenly mixing in first moulded head, by air forming and vacuum draw effect, make this mixture through the first moulded head and evenly shakedown drop on a guipure for no reason, the selectable use pony press of the paper of moulding carries out certain precompressed to the initial stage composite;
(2) then this composite bed is delivered to second shaping area, PLA/PLA composite fibre and cellulose fibre are evenly mixed in second moulded head, fall on ground floor by air forming and vacuum draw paving;
(3) then enter the 3rd shaping area, PLA/PLA composite fibre, cellulose fibre evenly mix and drop on the second layer by air forming and vacuum draw effect paving in the 3rd horizontal screen mesh type moulded head;
(4) then by the composite of above-mentioned formation by hot-pressing roller with further rock-steady structure, after one group of hot-pressing roller of selectable use carries out the thickness adjustment, this composite is sent in drying box and is heated, baking and curing, continuation is carried out coiling by reel machine after compound dust-free paper product is cooling after the compound dust-free paper after solidifying is delivered to selectable another group hot-pressing roller carries out the thickness adjustment;
(5), by demand, cut into the product of desired different in width with cutting machine.
But the purposes in disposable sanitary articles that also relates to the degradable dry-papermaking of the present invention, 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.
But degradable dry-papermaking of the present invention has following beneficial effect:
(1) the degradable composite fibre that product of the present invention is selected reproducible string and produced by reproducible plant amylum, replaced traditional adhesive solidification material by the PLA/PLA composite fibre, the PLA fiber not only has certain sucting wet air permeability, its catabolite is carbon dioxide and water, can be absorbed by the plant photosynthesis, again form starch, not produce toxic gas during burning, environmentally safe is the new no-dust paper of environmental protection.
(2) utilize the PLA fiber to there is good UV resistant performance, make product that UV resistant performance preferably, the useful life that has extended product be arranged.
(3) adopt the production technology the present invention relates to, due to each uniform component distribution, interlayer engages complete, at sanitary napkin, and protection pad, wiper, the use such as imbibition pad abandon in the paper for daily use product effect of playing good water conservancy diversion and absorbing liquid.
The accompanying drawing explanation
But Fig. 1 is the structural representation of degradable dry-papermaking of the present invention.
But Fig. 2 is the production technology schematic diagram of degradable dry-papermaking of the present invention.
Wherein: a1 is the first environmental protection layer, and a2 is the second environmental protection layer, and a3 is the 3rd environmental protection layer; B1 is cellulose fibre, and b2 is the PLA/PLA fiber.
The specific embodiment
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 water conservancy diversion material of the present invention is as follows:
1. thickness (normative reference: EDANA 30.5-99)
Thickness: at two, measure between plate, the distance of measuring under certain pressure (0.5kPa), unit is mm.
Tester: digital display type Thickness measuring instrument.
Requirement according to different product is sampled, is cut sample, and on the edge of the specimen size of test and instrument, plate edge is not less than 5mm; Requirement is (23 ± 2 ℃ of constant temperature and humidities; Relative humidity 50% ± 5%), under condition, the balance sample is more than at least 4 hours.Balance can not be done in online detection in real time if, but should record temperature and humidity at that time when being measured, and compares for your guidance.
2. quantitative (normative reference: EDANA 40.3-90)
Quantitatively: 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), balance is provided with screen outward and prevents air-flow and the impact of other disturbing factors on balance.
Sample requires (23 ± 2 ℃ of constant temperature and humidities; Relative humidity 50% ± 5%), under condition, the balance sample is more than at least 4 hours.Online detection in real time, can not do balance, but should record temperature and humidity at that time when being measured if, compares for your guidance.
To measure sample and be placed on balance, after the stable reading of balance, record weight, mean with gram.
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: EDANA 20.2-89)
Tensile strength: the sample of given size is subject to constant speed and is stretched to tension force required while rupturing.
Determining instrument: Zwick 2.5-strength tester
Sample is cut into to the size of 200mmx25.4mm, requires (23 ± 2 ℃ of constant temperature and humidities; Relative humidity 50 ± 5%) under condition, the balance sample is more than at least 4 hours, and online detection in real time, can not do balance, but should write down temperature and humidity at that time when being measured if, compares for your guidance.
Set test program according to following test parameter:
Maximum measuring range: 100N
Test speed: 254mm/min
Folder distance: 51mm
Cramping: 5bar
4. liquid permeation rate (normative reference: EDANA 150.5-02)
Liquid permeation rate: when 0.9% sodium chloride solution of 5m1 permeates sample, by passing through the time of circuit electric conductivity recording liquid, unit is second.
Determining instrument: Lister Liquid Penetrant instrument
5. liquid absorption capacity (EDANA 10.4-02)
Liquid absorption capacity: after sample being soaked in liquid to 10 minutes certain hours, the percentage that gross weight increases is the absorbability of sample.
But the degradable dry-papermaking of the present embodiment always quantitatively be about 50g/m
2, thickness is about 1.0mm, and its concrete raw material is as follows: cellulose fibre is chosen Weyerhauser NB416, and fiber is about 2-5mm, or GP4822 processes oar; PLA/PLA composite fibre fiber number is 2.2dtex/6mm, and fibrocortex is about 130 ℃, and sandwich layer is about 160 ℃.
This compound dust-free paper structure comprises three layers, ground floor quantitatively to account for product total quantitative 35%, the second layer quantitatively account for total quantitative 35%, the three layer of product quantitatively account for product total quantitative 30%.Shown in the following list 1 of the distribution of each component in each layer.
But the degradable dry-papermaking of the present embodiment always quantitatively be about 80g/m
2, thickness is about 1.5mm, and its concrete raw material is as follows: cellulose fibre is chosen Weyerhauser NB416, and fiber is about 2-5mm, or GP4822 processes oar; PLA/PLA composite fibre fiber number is 2.2dtex/6mm, and fibrocortex is about 130 ℃, and sandwich layer is about 160 ℃.
This compound dust-free paper structure comprises three layers, ground floor quantitatively to account for product total quantitative 30%, the second layer quantitatively account for total quantitative 40%, the three layer of product quantitatively account for product total quantitative 30%.Shown in the following list 2 of the distribution of each component in each layer.
But the degradable dry-papermaking of the present embodiment always quantitatively be about 150g/m
2, thickness is about 2.0mm, and its concrete raw material is as follows: cellulose fibre is chosen Weyerhauser NB416, and fiber is about 2-5mm, or GP4822 processes oar; PLA/PLA composite fibre fiber number is 2.2dtex/6mm, and fibrocortex is about 130 ℃, and sandwich layer is about 160 ℃.
This compound dust-free paper structure comprises three layers, ground floor quantitatively to account for product total quantitative 40%, the second layer quantitatively account for total quantitative 35%, the three layer of product quantitatively account for product total quantitative 25%.Shown in the following list 3 of the distribution of each component in each layer.
But the preparation process of the degradable dry-papermaking in above embodiment is as follows:
This water conservancy diversion material is realized on horizontal screen mesh type forming technique equipment.
As Fig. 2, by the PLA/PLA composite fibre, cellulose fibre is sent in first moulded head 1 and evenly mixes, by air forming and vacuum draw effect, make this mixture through the first moulded head and evenly shakedown drop on a guipure for no reason, 2 pairs of initial stage composites of the selectable use pony press of the paper of moulding carry out certain precompressed; Then this composite bed is delivered to second shaping area, PLA/PLA composite fibre and cellulose fibre are evenly mixed in second moulded head 3, by air forming and vacuum draw paving, fall on ground floor, then enter the 3rd shaping area, the PLA/PLA composite fibre, cellulose fibre evenly mixes and drops on the second layer by air forming and vacuum draw effect paving in the 3rd horizontal screen mesh type moulded head 4; Then the composite of above-mentioned formation is passed through to hot-pressing roller 5 with further rock-steady structure, after one group of hot-pressing roller of selectable use 6 carries out the thickness adjustment, this composite is sent in drying box 7 and is heated, baking and curing, continuation is carried out coiling by reel machine 9 after compound dust-free paper product is cooling after the compound dust-free paper after solidifying is delivered to selectable another group hot-pressing roller 8 carries out the thickness adjustment.By demand, cut into the product of desired different in width with cutting machine.The performance parameter testing result of above each embodiment product is as shown in table 4:
Table 4
As can be seen from Table 4, in the embodiment of the present invention, the key property of each product has all reached the standard of the dust-free paper of prior art and manufacture of materials, has the effect of good water conservancy diversion and absorption liquid.Comprehensively relatively, it is excellent that degradable dry-papermaking of the present invention also has environmental-protecting performance, and UV resistant performance preferably, the useful life that has extended product are arranged
Above preferred embodiment of the present invention is had been described in detail, but described content is only preferred embodiment of the present invention, can not be considered to for limiting practical range of the present invention.All equalization variations of doing according to the present patent application scope and improvement etc., within all should still belonging to patent covering scope of the present invention.
Claims (9)
- But 1. 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 total quantitative 15-50% of this dry-papermaking;The second layer is the second environmental protection layer, can account for the total quantitative 10-40% of this dry-papermaking with this layer of ground floor fluid connection;The 3rd layer is the 3rd environmental protection layer, can account for the total quantitative 20-45% of this dry-papermaking with this layer of second layer fluid connection;Described is quantitatively always the gross weight of three layers of ground floors to the.
- 2. but a kind of degradable dry-papermaking according to claim 1, it is characterized in that: described the first environmental protection layer comprises cellulose fiber peacekeeping PLA/PLA composite fibre, the 60-85 quality % that wherein cellulose fiber content is this layer, the 15-40 quality % that PLA/PLA composite fibre content is this layer.
- 3. but a kind of degradable dry-papermaking according to claim 1, it is characterized in that: described the second environmental protection layer comprises cellulose fiber peacekeeping PLA/PLA composite fibre, the 60-85 quality % that wherein cellulose fiber content is this layer, the 15-40 quality % that PLA/PLA composite fibre content is this layer.
- 4. but a kind of degradable dry-papermaking according to claim 1, it is characterized in that: described the 3rd environmental protection layer comprises cellulose fiber peacekeeping PLA/PLA composite fibre, the 60-85 quality % that wherein cellulose fiber content is this layer, the 15-40 quality % that PLA/PLA composite fibre content is this layer.
- 5. but a kind of degradable dry-papermaking according to claim 1, it is characterized in that: described cellulose fibre comes from the natural plant fibres such as wood material fully, is selected from through processing or the fiber of untreated Time of Fluff Slurry, softwood pulp, hardwood pulp, straw pulp, chemical pulp, chemi-mechanical pulp, heat engine slurry and composition thereof.
- 6. but a kind of degradable dry-papermaking according to claim 1, is characterized in that: the fiber that described PLA/PLA composite fibre selects the starch materials such as free corn or cassava manually to make.
- 7. but a kind of degradable dry-papermaking according to claim 1 is characterized in that: but the quantitative scope of described degradable dry-papermaking is 40g/m 2～600g/m 2.
- 8. but the preparation technology of the described a kind of degradable dry-papermaking of claim 1-7 any one, is characterized in that, concrete steps are as follows:(1) PLA/PLA composite fibre and cellulose fibre are sent to evenly mixing in first moulded head, by air forming and vacuum draw effect, make this mixture through the first moulded head and evenly shakedown drop on a guipure for no reason, the selectable use pony press of the paper of moulding carries out certain precompressed to the initial stage composite;(2) then this composite bed is delivered to second shaping area, PLA/PLA composite fibre and cellulose fibre are evenly mixed in second moulded head, fall on ground floor by air forming and vacuum draw paving;(3) then enter the 3rd shaping area, PLA/PLA composite fibre, cellulose fibre evenly mix and drop on the second layer by air forming and vacuum draw effect paving in the 3rd horizontal screen mesh type moulded head;(4) then by the composite of above-mentioned formation by hot-pressing roller with further rock-steady structure, after one group of hot-pressing roller of selectable use carries out the thickness adjustment, this composite is sent in drying box and is heated, baking and curing, continuation is carried out coiling by reel machine after compound dust-free paper product is cooling after the compound dust-free paper after solidifying is delivered to selectable another group hot-pressing roller carries out the thickness adjustment;(5), by demand, cut into the product of desired different in width with cutting machine.
- 9. but the application of the described a kind of degradable dry-papermaking of claim 1-7 any one, is characterized in that, described degradable dry-papermaking aspect disposable sanitary articles and other liquid absorption in purposes.
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Cited By (5)
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| CN107215034A (en) * | 2017-04-26 | 2017-09-29 | 博爱（中国）膨化芯材有限公司 | A kind of compound speed of online heat oozes fluid conducting material |
| 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 |
| CN112900128A (en) * | 2021-02-09 | 2021-06-04 | 上海顶欣纸制品有限公司 | Production process of paper and tableware |
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| CN112900128A (en) * | 2021-02-09 | 2021-06-04 | 上海顶欣纸制品有限公司 | Production process of paper and tableware |
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| Publication number | Publication date |
|---|---|
| CN103422252B (en) | 2016-02-17 |
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