CN102587042A - One-step polylactic acid spun-laid spunlace non-woven fabric and manufacturing method of non-woven fabric - Google Patents
One-step polylactic acid spun-laid spunlace non-woven fabric and manufacturing method of non-woven fabric Download PDFInfo
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Abstract
The invention relates to a one-step polylactic acid spun-laid spunlace non-woven fabric and a manufacturing method of the non-woven fabric. The non-woven fabric is prepared from polylactic acid filaments, and the fiber number is in a range of 1-4dtex; the component of the non-woven fabric is crystalline polylactic acid, which has a molecular weight of above 150,000, a melting point of 160-180 DEG C and a glass transition temperature of about 60 DEG C, and is prepared by polymerizing maize starch. The manufacturing method of the non-woven fabric comprises the following steps of: 1, preparing a polylactic acid spun melt, namely, fermenting the maize starch to prepare the polylactic acid, preparing a polylactic acid prepolymer by controlling polymerization conditions with polylactic acid, and preparing the polylactic acid spun melt with a molecular weight of above 150,000 through continuous melt polycondensation by utilizing a double screw; and 2, preparing a polylactic acid spun-bonded spunlace non-woven fabric, namely, spinning the spun melt by a spinning assembly, cooling and drafting by air current, separating and laying, fixing nets by utilizing the spunlace technology, and drying to obtain the polylactic acid spun-laid spunlace non-woven fabric. The polylactic acid spun-laid spunlace non-woven fabric is high in intensity and has the characteristics of good softness, skin affinity, moisture permeability and biodegradability.
Description
Technical field
The present invention relates to a kind of non-weaving cloth manufacturing technology; It is high to be specially a kind of intensity; And PLA filature fleece formation hydro-entangled non-woven fabric and manufacturing approach thereof with improved flexibility, skin compatibility, sucting wet air permeability and biological degradability, international Patent classificating number are intended and are Int.Cl D01F1/09 (2006.01).
Background technology
PLA (PLA) is an initial raw material with the starch in some plants such as corn, wheat, cassava, decomposes through enzyme to obtain glucose, becomes lactic acid through behind the lactobacillus-fermented again, obtains the high-purity PLA through chemical synthesis then.With this renewable resource is that the non-weaving cloth of the PLA preparation of raw material is a kind of new material, do not rely on the natural stone resource fully, so its development does not receive the restriction of the exhausted day by day crisis of world oil, coal.Simultaneously, also reduce indirectly petrochemical industry to the pollution of atmosphere and discarded object thereof to environment damage.
Polylactic acid article is discarded the back in soil or water, can thoroughly resolve into CO under field conditions (factors) in 30 days
2And H
2O can not produce environment and pollute, thereby be a kind of Biodegradable material of complete Natural Circulation type.Along with the preserve our planet reinforcement day by day of environmental consciousness of the mankind, the research and development of green technology, environment-friendly products more to be paid close attention to, biodegradable polylactic acid non-weaving cloth is used will have application prospect more and more widely.
Though the raw material sources of acid fiber by polylactic are abundant and cheap; But the needed costs of process such as its polymerization spinning process are higher; And the degree of polymerization of acid fiber by polylactic awaits further raising, thereby makes the nonwoven products large-scale industrial production of PLA receive certain restriction with being widely used.But the biodegradation character of PLA itself makes it have nondegradable nonwoven product now in replacement, promote aspect the environmental protection enormous function is arranged as environment-friendly materials, will become a kind of nonwoven product of giving priority to from now on.
In recent years, polylactic acid non-weaving cloth is carried out developmental research both at home and abroad, and formed some patents.KR20080106609 has introduced a kind of polylactic acid short-fiber carding technology of water thorn reinforcing preparation PLA hydro-entangled non-woven fabric again of utilizing; Owing to adopt staple card to become the mode of net; Therefore the intensity of product is relatively low, and this has just limited its Application Areas.USP5833787 has introduced a kind of polylactic acid slice one-step method of utilizing and has prepared PLA spun-bonded non-woven and technology of preparing thereof, its fixed network process using be that heat bonding is reinforced.USP5910368 has introduced another kind of hydrophily PLA spun-bond process non-weaving cloth technology of preparing; With becoming net through spunbond technology after the polylactic acid slice drying; Through sprinkling or foam impregnation method the hydrophilic surfactant active is handled fibre web then, utilize the hot calendering bonding fixed network again.Japan You Nijika company has also successfully manufactured experimently the PLA spun-bonded non-woven with the one-step method spunbond process.Because these technology all adopt the hot rolling method to reinforce, and make that the feel of product is harder.Germany's Saxony textile research is studied PLA spun-bonded spunlace non-weaving cloth; Research through section drying process, spinning technique and water thorn reinforcement process; The result shows; Suitable biodegradable spun-bonded non-woven can be processed with the suction air principle, but for the reliability of technology, the more research of still needing is supported.
The Shanghai Synthetic Fibre Inst is the domestic unit that carries out the technical research of PLA spun-bond process the earliest; Carrying out on the basis of serial lab scale and expanding test; Born the supporting plan project " PLA spun-bond process non-weaving cloth equipment and technology research and development " of the Ministry of Science and Technology; After original bi-component composite spunbonding process production line being carried out the part transformation, formed a fabric width 3.2m, produced the production line of 1000t per year, and passed through the project acceptance inspection and technical appraisement.
But; In these present polylactic acid non-weaving cloth technologies of preparing; Generally all be that water thorn or polylactic acid slice spun-bonded hot rolling form again through the polylactic acid short-fiber carding; Aspect the intensity of product and feel, exist not enough, thereby the performance of PLA can not be brought into play well, restricted the Application Areas of product.In addition, adopt section as raw material, drying process is extremely important, because the existence of moisture has very big influence to the spinnability of PLA and the performance of final non-weaving cloth in the spinning process.Directly carry out filature fleece formation, water thorn and reinforce the technology that one-step method prepares PLA filature fleece formation hydro-entangled non-woven fabric and do not see that also report is arranged and adopt cornstarch fermentation polymerization to process polylactic acid melt.
Summary of the invention
The deficiency of and properties of product strict to section drying process in the existing polylactic acid slice filature fleece formation method; The technical problem that quasi-solution of the present invention is determined is; Provide one-step method to prepare PLA filature fleece formation hydro-entangled non-woven fabric and manufacturing approach thereof; This PLA filature fleece formation hydro-entangled non-woven fabric adopts cornstarch fermentation polymerization to process polylactic acid melt, directly carries out filature fleece formation, the water thorn is reinforced one-step method and prepared PLA filature fleece formation hydro-entangled non-woven fabric, has saved operations such as granulating polymer melts, chip drying; Technological process is short, cost is low, is applicable to suitability for industrialized production; Product strength is high; And have good flexibility, skin compatibility, sucting wet air permeability and biological degradability; Can be used for operating coat, operation drape, mouth mask, baby diaper, sanltary towel, adult's incontinence articles, isolate medical and hygiene article aspects such as clothes, disposable breathing mask, gloves; Exploitation prospect is wide, has practical extending application value.
The technical scheme that the present invention solves said non-weaving cloth technical problem is: design a kind of one-step method PLA filature fleece formation hydro-entangled non-woven fabric, this non-weaving cloth prepares the PLA spinning melt by cornstarch through twin-screw, and this molecular melt amount reaches more than 150,000; Utilize this polylactic acid melt filature fleece formation, water thorn to reinforce one-step method again and process PLA filature fleece formation method hydro-entangled non-woven fabric, the denier range of fiber is 1-4dtex in this non-weaving cloth, for quantitatively greater than 80g/m
2This non-weaving cloth, its longitudinal fracture intensity is higher than 110N/5cm intensity, cross-breaking strength is higher than 90N/5cm.
The technical scheme that the present invention solves said non-weaving cloth manufacturing approach technical problem is: design a kind of one-step method PLA filature fleece formation hydro-entangled non-woven fabric manufacturing approach; This manufacturing approach is a raw material with cornstarch of the present invention, and adopts following processing step:
1. prepare the PLA spinning melt: 1. amylofermentation prepares the lactic acid performed polymer: cornstarch is processed the glucose of refining in the end under the hydrolysis of acid, enzyme, fermenting process of preparing becomes lactic acid again, controls polymerizing condition again and is prepared into the lactic acid performed polymer; 2. the preparation of melt PLA: utilize double screw extruder to prepare molecular weight through the continuous fusion polycondensation as catalyst, screw speed under for the condition of 50-100r/min for 140-160 ℃, the stannous octoate of 0.3-0.5% and be higher than 150,000 melt PLA, supply follow-up spinning to use in reaction temperature;
2. PLA spun-bonded spunlace non-weaving cloth preparation: 1. spinning lapping: the polylactic acid melt of above-mentioned preparation is carried out spinning in the input filament spinning component at 190-240 ℃ behind fondant filter and measuring pump; Air drawing speed with 4000-7000m/min in the tubular type extension apparatus is carried out drawing-off, and divides the silk lapping through pendulum formula pendulum silk device; 2. water stings fixed network: with the fibre web input water thorn zone that put the shop, and fixed fibre web under the hydraulic pressure of 2-15MPa, and, process said PLA filature fleece formation hydro-entangled non-woven fabric in 110-130 ℃ of oven dry.
Compare with existing polylactic acid non-weaving cloth product; The present invention utilizes twin-screw to prepare molecular weight through the continuous fusion polycondensation to be higher than 150,000 melt PLA and to be spinning melt; Resulting polylactic acid molecule amount is high, degree of crystallinity decreases, and this is highly profitable to the big fragility of improving poly-lactic acid material and in use showing; Become net polylactic acid non-weaving cloth product with respect to staple card, intensity is greatly improved, for quantitatively greater than 80g/m
2This non-weaving cloth, its longitudinal fracture intensity is higher than 110N/5cm intensity, cross-breaking strength is higher than 90N/5cm; Utilize water thorn technology to reinforce, the flexibility of product, skin compatibility, moisture permeability are better.Therefore, can be used for operating coat, operation drape, mouth mask, baby diaper, sanltary towel, adult's incontinence articles, isolate medical and hygiene article aspects such as clothes, disposable breathing mask, gloves, exploitation prospect is wide.
Polylactic acid molecule amount that the present invention explained adopts viscosimetry to measure, and test process carries out with reference to GB GB/T14190-2008, is the dissolution with solvents polylactic acid melt with the chloroform and measures with Ubbelohde viscometer; The vertical transverse strength of non-weaving cloth adopts YG065 series electronic fabric strength machine to test, and test process reference standard FZ/T60005-91 carries out.
Compare with existing polylactic acid non-weaving cloth technology of preparing; This technology of preparing adopts double screw extruder; Prepare polylactic acid melt through the continuous fusion polycondensation and directly carry out filature fleece formation, water thorn and reinforce one-step method and prepare PLA filature fleece formation hydro-entangled non-woven fabric, saved operations such as granulating polymer melts, chip drying, technological process is short, cost is low; Be applicable to suitability for industrialized production, have practical extending application value.
Description of drawings
Fig. 1 is the microtomy PLA filature fleece formation non-weaving cloth manufacturing approach craft schematic flow sheet of prior art.
Fig. 2 is an one-step method PLA filature fleece formation hydro-entangled non-woven fabric manufacturing approach craft schematic flow sheet of the present invention.
The specific embodiment
Further narrate the present invention below in conjunction with embodiment.
A kind of one-step method PLA filature fleece formation hydro-entangled non-woven fabric of the present invention's design, this non-weaving cloth is processed by the PLA long filament, and the denier range of fiber is 1-4dtex; Its component is a crystalline polylactic acid, and molecular weight is more than 150,000, and fusing point 160-180 ℃, about 60 ℃ of vitrification point is fermented, is polymerized by cornstarch.
Existing PLA filature fleece formation hydro-entangled non-woven fabric, major part are to be reinforced through hot rolling, acupuncture or water thorn through carding by staple fibre to form again, so the intensity of product is lower, and are difficult to be processed into slim product; Microtomy filature fleece formation method polylactic acid non-weaving cloth is then reinforced and is formed through melt spinning, hot rolling by polylactic acid slice; Drying process to section requires very strict; The feel of product was harder after hot rolling was reinforced in addition; Influence pliability, skin compatibility and the moisture permeability of product, thereby made the Application Areas of product receive certain restriction.
One-step method PLA filature fleece formation hydro-entangled non-woven fabric of the present invention (hereinafter to be referred as non-weaving cloth); The employing cornstarch is raw material, utilizes double screw extruder to prepare PLA spinning melt direct fabrics through the continuous fusion polycondensating process; Save operations such as polylactic acid melt granulation, chip drying, overcome the difficult deficiency of drying process control in the slice spinning process; Utilize spunbond technology to carry out single step spining and become net, fiber is put by the long filament shop and is formed in the fibre web, has overcome staple card and has become the low deficiency of net product strength; Utilize the water thorn to reinforce the final non-weaving cloth of preparation, overcome the deficiency of hot-rolled product Boardy Feeling, sucting wet air permeability difference.Experiment shows, for being 80g/m quantitatively
2Non-weaving cloth, longitudinal strength can reach 110N/5cm, transverse strength can reach 90N/5cm, sucting wet air permeability and flexibility are far above other polylactic acid non-weaving cloth products.
The present invention has designed the manufacturing approach of one-step method PLA filature fleece formation hydro-entangled non-woven fabric simultaneously, and it adopts cornstarch is raw material and following processing step:
(1) preparation PLA spinning melt: 1. amylofermentation prepares the lactic acid performed polymer: cornstarch is processed the glucose of refining in the end under the hydrolysis of acid, enzyme, fermenting process of preparing becomes lactic acid again, controls polymerizing condition again and is prepared into the lactic acid performed polymer; 2. the preparation of melt PLA: utilize double screw extruder to prepare molecular weight through the continuous fusion polycondensation as catalyst, screw speed under for the condition of 50-100r/min for 140-160 ℃, the stannous octoate of 0.3-0.5% and be higher than 150,000 melt PLA, supply follow-up spinning to use in reaction temperature;
(2) PLA spun-bonded spunlace non-weaving cloth preparation: 1. spinning lapping: the polylactic acid melt of above-mentioned preparation is carried out spinning in the input filament spinning component at 190-240 ℃ behind fondant filter and measuring pump; Air drawing speed with 4000-7000m/min in the tubular type extension apparatus is carried out drawing-off, and divides the silk lapping through pendulum formula pendulum silk device; 2. water stings fixed network: with the fibre web input water thorn zone that put the shop, and fixed fibre web under the hydraulic pressure of 2-15MPa, and, process said PLA filature fleece formation hydro-entangled non-woven fabric in 110-130 ℃ of oven dry.
The technological process of production of existing microtomy PLA filature fleece formation hydro-entangled non-woven fabric is (referring to Fig. 1): earlier with cornstarch by fermentation, prepare PLA after the polymerization; The casting grain is processed polylactic acid slice then; Non-weaving cloth producer is dried to moisture content at a certain temperature with the polylactic acid slice of buying and reaches below the 50ppm; Feed the screw extruder fusion then; After fondant filter filtration, measuring pump metering, get into the filament spinning component spinning, the hot rolling reinforcing forms after air drawing, the lapping of branch silk.Because the spinning temperature narrow range of PLA itself, the existence of moisture is very big to spinning technology parameter and fibre property influence, and is therefore very strict to the control of drying process.Simultaneously, adopt the hot rolling method to reinforce, the flexibility of product is relatively poor, and moisture permeability also is affected because of thermal bond points.
The manufacturing approach technological process of production of non-weaving cloth of the present invention is (referring to Fig. 2): cornstarch is processed the glucose of refining in the end under the hydrolysis of acid, enzyme, fermenting process of preparing becomes lactic acid again, controls polymerizing condition again and is prepared into the lactic acid performed polymer; Utilize double screw extruder to prepare molecular weight through the continuous fusion polycondensation and be higher than 150,000 melt PLA, after fondant filter filtration, measuring pump metering, get into the filament spinning component spinning then, water stings to reinforce and forms after air drawing, the lapping of branch silk.
The present invention designs and adopts the polycondensation of cornstarch continuous fusion to prepare polylactic acid melt spinning solution direct fabrics; Resulting polylactic acid molecule amount is high, degree of crystallinity decreases, and this is highly profitable to the big fragility of improving follow-up polylactic acid non-weaving cloth and in use showing; Through control attenuating blast speed; Can obtain the acid fiber by polylactic that fiber number is 1-4dtex; Can obtain after water thorn is reinforced that non-weaving cloth intensity than prior art for preparing is high, soft, sucting wet air permeability and the better product of skin compatibility, enlarge its range of application.In the known scope of applicant, non-weaving cloth of the present invention and manufacturing approach thereof are not also seen the concrete report that the document that is closely related is arranged.
The present invention does not address part and is applicable to prior art.
Below provide specific embodiment of the present invention.The present invention does not receive the restriction of specific embodiment.
Embodiment 1
Cornstarch is processed glucose through hydrolysis, uses the Bacillus acidi lactici anaerobic fermentation again, sweat with in the liquid caustic soda with generate lactic acid, zymotic fluid is used electrodialysis process after purifying, process purity and reach 99.5% L-lactic acid; The L-lactic acid of gained is prepared lactic acid oligomers through decompression dehydration, is that 150 ℃, stannous octoate catalyst consumption are 0.3%, to make viscosity average molecular weigh through the twin-screw reaction when screw speed is 60r/min be 15.8 ten thousand polylactic acid melt in reaction temperature; With melt through filter filter, after the measuring pump metering 225 ℃ of spinning, drawing-off and lapping are carried out in the cooling back in the air-flow of 5000m/min, sting after 115 ℃ of oven dry make above-mentioned non-weaving cloth at 2MPa, 8MPa, 12MPa, 10MPa, 10MPa five road water.
This nonwoven product quantitatively is 80g/m
2, average fibre number is 3.2dtex in the fibre web, non-weaving cloth surfacing, soft, and vertical transverse strength is respectively 112N/5cm and 93N/5cm.
Embodiment 2
Cornstarch is processed glucose through hydrolysis, uses the Bacillus acidi lactici anaerobic fermentation again, sweat with in the liquid caustic soda with generate lactic acid, zymotic fluid is used electrodialysis process after purifying, process purity and reach 99.5% L-lactic acid; The L-lactic acid of gained is prepared lactic acid oligomers through decompression dehydration, is that 150 ℃, stannous octoate catalyst consumption are 0.4%, to make viscosity average molecular weigh through the twin-screw reaction when screw speed is 75r/min be 18.2 ten thousand polylactic acid melt in reaction temperature; With melt through filter filter, after the measuring pump metering 230 ℃ of spinning, drawing-off and lapping are carried out in the cooling back in the air-flow of 5500m/min, sting after 115 ℃ of oven dry make above-mentioned non-weaving cloth at 2MPa, 8MPa, 14MPa, 10MPa, 12MPa five road water.
This nonwoven product quantitatively is 80g/m
2, average fibre number is 3.0dtex in the fibre web, non-weaving cloth surfacing, soft, and vertical transverse strength is respectively 116N/5cm and 94N/5cm.
Embodiment 3
Cornstarch is processed glucose through hydrolysis, uses the Bacillus acidi lactici anaerobic fermentation again, sweat with in the liquid caustic soda with generate lactic acid, zymotic fluid is used electrodialysis process after purifying, process purity and reach 99.5% L-lactic acid; The L-lactic acid of gained is prepared lactic acid oligomers through decompression dehydration, is that 150 ℃, stannous octoate catalyst consumption are 0.5%, to make viscosity average molecular weigh through the twin-screw reaction when screw speed is 75r/min be 19.8 ten thousand polylactic acid melt in reaction temperature; With melt through filter filter, after the measuring pump metering 230 ℃ of spinning, drawing-off and lapping are carried out in the cooling back in the air-flow of 6000m/min, sting after 115 ℃ of oven dry make above-mentioned non-weaving cloth at 2MPa, 8MPa, 14MPa, 10MPa, 12MPa five road water.
This nonwoven product quantitatively is 80g/m
2, average fibre number is 3.0dtex in the fibre web, non-weaving cloth surfacing, soft, and vertical transverse strength is respectively 117N/5cm and 98N/5cm.
Embodiment 4
Cornstarch is processed glucose through hydrolysis, uses the Bacillus acidi lactici anaerobic fermentation again, sweat with in the liquid caustic soda with generate lactic acid, zymotic fluid is used electrodialysis process after purifying, process purity and reach 99.5% L-lactic acid; The L-lactic acid of gained is prepared lactic acid oligomers through decompression dehydration, is that 155 ℃, stannous octoate catalyst consumption are 0.5%, to make viscosity average molecular weigh through the twin-screw reaction when screw speed is 75r/min be 21.6 ten thousand polylactic acid melt in reaction temperature; With melt through filter filter, after the measuring pump dosage 230 ℃ of spinning, drawing-off and lapping are carried out in the cooling back in the air-flow of 7000m/min, sting after 120 ℃ of oven dry make above-mentioned non-weaving cloth at 3MPa, 9MPa, 15MPa, 12MPa, 13MPa five road water.
This nonwoven product quantitatively is 100g/m
2, average fibre number is 2.8dtex in the fibre web, non-weaving cloth surfacing, soft, and vertical transverse strength is respectively 132N/5cm and 114N/5cm.
Embodiment 5
Cornstarch is processed glucose through hydrolysis, uses the Bacillus acidi lactici anaerobic fermentation again, sweat with in the liquid caustic soda with generate lactic acid, zymotic fluid is used electrodialysis process after purifying, process purity and reach 99.5% L-lactic acid; The L-lactic acid of gained is prepared lactic acid oligomers through decompression dehydration, is that 160 ℃, stannous octoate catalyst consumption are 0.5%, to make viscosity average molecular weigh through the twin-screw reaction when screw speed is 80r/min be 25.6 ten thousand polylactic acid melt in reaction temperature; With melt through filter filter, after the measuring pump dosage 235 ℃ of spinning, drawing-off and lapping are carried out in the cooling back in the air-flow of 7000m/min, sting after 120 ℃ of oven dry make above-mentioned non-weaving cloth at 3MPa, 9MPa, 15MPa, 12MPa, 13MPa five road water.
This nonwoven product quantitatively is 100g/m
2, average fibre number is 2.6dtex in the fibre web, non-weaving cloth surfacing, soft, and vertical transverse strength is respectively 135N/5cm and 118N/5cm.
Embodiment 6
Cornstarch is processed glucose through hydrolysis, uses the Bacillus acidi lactici anaerobic fermentation again, sweat with in the liquid caustic soda with generate lactic acid, zymotic fluid is used electrodialysis process after purifying, process purity and reach 99.5% L-lactic acid; The L-lactic acid of gained is prepared lactic acid oligomers through decompression dehydration, is that 160 ℃, stannous octoate catalyst consumption are 0.5%, to make viscosity average molecular weigh through the twin-screw reaction when screw speed is 90r/min be 27.8 ten thousand polylactic acid melt in reaction temperature; With melt through filter filter, after the measuring pump dosage 235 ℃ of spinning, drawing-off and lapping are carried out in the cooling back in the air-flow of 7000m/min, sting after 120 ℃ of oven dry make above-mentioned non-weaving cloth at 3MPa, 9MPa, 15MPa, 12MPa, 12MPa five road water.
This nonwoven product quantitatively is 100g/m
2, average fibre number is 2.6dtex in the fibre web, non-weaving cloth surfacing, soft, and vertical transverse strength is respectively 138N/5cm and 116N/5cm.
Claims (5)
1. polylactic acid melt that is used to prepare the filature fleece formation hydro-entangled non-woven fabric; It is characterized in that: the molecular weight of this melt is greater than 150,000; Described polylactic acid melt is processed lactic acid by the cornstarch fermentation; Prepare the lactic acid performed polymer by lactic acid control polymerizing condition again, utilize double screw extruder to be prepared from through the continuous fusion polycondensation.
2. PLA filature fleece formation hydro-entangled non-woven fabric, it is characterized in that: the long filament by 1-4dtex is formed, for quantitatively greater than 80g/m
2This non-weaving cloth, its longitudinal fracture intensity is higher than 110N/5cm intensity, cross-breaking strength is higher than 90N/5cm.
3. non-weaving cloth as claimed in claim 2 is characterized in that: by the described polylactic acid melt of claim 1 is that feedstock production forms.
4. like claim 2 or 3 described non-weaving cloths, be raw material, be prepared from through the following step again by the described polylactic acid melt of claim 1:
(1) spinning lapping: polylactic acid melt is carried out spinning in the input filament spinning component at 190-240 ℃ behind fondant filter and measuring pump; Air drawing speed with 4000-7000m/min in the tubular type extension apparatus is carried out drawing-off, and divides the silk lapping through pendulum formula pendulum silk device;
(2) water thorn fixed network: with the fibre web input water thorn zone that put the shop, fixed fibre web under the hydraulic pressure of 8-15MPa, and, process said PLA filature fleece formation hydro-entangled non-woven fabric in 110-130 ℃ of oven dry.
5. the manufacturing approach of an one-step method PLA filature fleece formation hydro-entangled non-woven fabric, its used raw material is the described polylactic acid melt of claim 1, said method comprises the steps:
(1) spinning lapping: polylactic acid melt is carried out spinning in the input filament spinning component at 190-240 ℃ behind fondant filter and measuring pump; Air drawing speed with 4000-7000m/min in the tubular type extension apparatus is carried out drawing-off, and divides the silk lapping through pendulum formula pendulum silk device;
(2) water thorn fixed network: with the fibre web input water thorn zone that put the shop, fixed fibre web under the hydraulic pressure of 8-15MPa, and, process said PLA filature fleece formation hydro-entangled non-woven fabric in 110-130 ℃ of oven dry.
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| CN104153129A (en) * | 2014-08-29 | 2014-11-19 | 井孝安 | Non-woven melt direct spinning one-step method continuous production device and technology |
| CN104356365A (en) * | 2014-10-13 | 2015-02-18 | 张家港市安顺科技发展有限公司 | Polylactic acid fiber production method |
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| CN108468154B (en) * | 2018-03-14 | 2020-12-18 | 天津工业大学 | Polylactic acid non-woven material with porous structure and preparation method thereof |
| CN110791113A (en) * | 2019-10-23 | 2020-02-14 | 江苏医药职业学院 | Degradable material, tableware and preparation method thereof |
| CN111074374A (en) * | 2019-12-31 | 2020-04-28 | 吉林中粮生化有限公司 | Method for preparing high-quality polylactic acid fiber by continuous polymerization melt direct spinning |
| CN112760742A (en) * | 2020-12-30 | 2021-05-07 | 广州市中诚新型材料科技有限公司 | Traditional Chinese medicine composite antiviral multifunctional degradable polylactic acid fiber and preparation method thereof |
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