CN104480642A - Preparation technology of non-woven fabrics - Google Patents
Preparation technology of non-woven fabrics Download PDFInfo
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- CN104480642A CN104480642A CN201410731215.0A CN201410731215A CN104480642A CN 104480642 A CN104480642 A CN 104480642A CN 201410731215 A CN201410731215 A CN 201410731215A CN 104480642 A CN104480642 A CN 104480642A
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
- D04H3/14—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic yarns or filaments produced by welding
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/005—Synthetic yarns or filaments
- D04H3/007—Addition polymers
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Nonwoven Fabrics (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
Abstract
The invention discloses a preparation technology of non-woven fabrics. The preparation technology includes delivering drying PP raw material cuttings into a screw extruder, forming nascent fibers by jetting from a spinneret hole after melted extrusion, filtering, measurement and even distribution of a die head, drafting the nascent fibers after air cooling, evenly placing on a web curtain of a web former via a diffuse wind tunnel, forming filament fabrics, and forming non-woven fabrics after hot rolling, coiling and slitting. The preparation technology of non-woven fabrics resolves problems of poor firmness, complicated preparation technology, large amount of labor force, and the like in the prior art, and the preparation technology of non-woven fabrics has the advantages of good firmness, easy preparation technology and small manual labor.
Description
Technical field
The present invention relates to weaving technology field, particularly, relate to a kind of preparation technology of nonwoven fabric.
Background technology
The high speed development of auto industry, has driven the fast development of large quantities of related industries, comprising nonwoven industrial.In order to adapt to the demand of Domestic Automotive Industry development, Non-Woven Fabric Industry has played positive effect, and especially spun-bonded non-woven about comes more in the purposes of auto industry, and its application quantity is also increasing.
Spun-bonded non-woven is as a kind of novel auto industry product, although the time is not very long, its purposes and application quantity are considerable.Spun-bonded non-woven extensive use is in the automotive industry determined by its design feature and basic nature the subject of knowledge and the object of knowledge completely.
Spun-bonded non-woven utilizes synthetic fiber spinning principle, makes the laid one-tenth net of continuous filament yarn in polymer spinning process, and filament web is reinforced through needle point method, water acupuncture manipulation, chemical adhesion method, calendar bonding process or hot blast adhesion method and forms non-weaving cloth.Spun-bond process production technology can adapt to different types of high polymer, technological process is short, and versatile and flexible, technology maturation, high in technological content, automaticity is high, and spinning speed is doubled and redoubled, fiber strength improves greatly, and fiber is more and more thinner, become net spee more and more faster, become net uniformity also to become better and better.60%-70% of its output Yi Zhan world non-weaving cloth total output, range of application is also more and more wider.Its fibre web of spun-bonded non-woven is made up of continuous filament yarn, so have good TENSILE STRENGTH; The filament linear density of composition non-weaving cloth is changeable, alterable wider range; Fibre web can adopt multiple method to reinforce, thus gives product with good application performance, enhances competitiveness.Due to spun-bonded non-woven netted by the laid one-tenth of continuous filament yarn after directly become cloth, fiber utilization coefficient is high, and unit are coverage rate is large, and covering property is good, so the non-weaving cloth of areal density can be processed into, this be other various non-weaving cloths incomparable.All things considered, spun-bonded non-woven comprehensive strength level is high, and smooth surface lint is little, soft, folding is wear-resisting, and lightproof ventilated performance is good, has good water suction lipophile, simultaneously heat-resisting, acidproof, alkaline-resisting, anti-mould and anti-moth, good stability of the dimension, is easy to processing, is convenient to recycle.
Simple just because of spun-bonded non-woven production technology, technological process is short, and product cost is low, and structure is unique, and technical performance is superior, so be widely used in auto industry, its use amount is far longer than other various non-weaving cloths by area.Spun-bonded non-woven not only can as the various inner decoration materials of automobile, and can as the waterproof sealing material of automobile, also can as the enhancing framework material of automobile, can also as the various packaging protective materialss of automobile, simultaneously or desirable auto industry filtering material.
In PP cellular production process, fracture of wire often has a strong impact on normally carrying out of production.Main manifestations is: drip, drawing-off fracture of wire.
Realizing in process of the present invention, inventor finds at least there is the defects such as fastness difference, complicated process of preparation and manual labor amount are large in prior art.
Summary of the invention
The object of the invention is to, for the problems referred to above, propose a kind of preparation technology of nonwoven fabric, to realize the advantage that fastness is good, preparation technology is simple and manual labor amount is little.
For achieving the above object, the technical solution used in the present invention is: a kind of preparation technology of nonwoven fabric, comprising:
Send into screw extruder after being dried by PP feed stock chip, after melt extruded, filtration, metering, form as-spun fibre through die head uniform distribution from spinneret orifice ejection again;
As-spun fibre, after air-flow cooling drawing-off, is placed on lapper lace curtaining by diffusor duct uniform spreading, the filament web of formation, through hot rolling, winding, becomes nonwoven fabric after cutting.
Further, described PP raw material, comprises polypropylene and feed back.
Further, described operation of being dried by PP feed stock chip, specifically comprises:
Dry run: the first stage is the pre-crystallized stage, hot air temperature 120-150 DEG C; Second stage is drying stage, hot air temperature 160-180 DEG C;
Drying plant: vacuum drum drying equipment gets rid of air and moisture in drum in time, and can prevent thermal oxidative degradation of cutting into slices, dry mass is high.
Further, the operation of described melt extruded, specifically comprises:
After section enters screw rod, be first transferred and preheating in screw feed section, then also melt gradually through the compacting of screw compression section, exhaust, then mixed plasticizing further in screw metering section, and reach default temperature, be delivered to later process with the pressure preset.
The preparation technology of the nonwoven fabric of various embodiments of the present invention, owing to comprising: send into screw extruder after being dried by PP feed stock chip, forms as-spun fibre through die head uniform distribution from spinneret orifice ejection again after melt extruded, filtration, metering; As-spun fibre, after air-flow cooling drawing-off, is placed on lapper lace curtaining by diffusor duct uniform spreading, the filament web of formation, through hot rolling, winding, becomes nonwoven fabric after cutting; Thus can overcome that fastness in prior art is poor, complicated process of preparation and the large defect of manual labor amount, to realize the advantage that fastness is good, preparation technology is simple and manual labor amount is little.
Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from description, or understand by implementing the present invention.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for description, together with embodiments of the present invention for explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the production principle schematic diagram of spun-bonded non-woven fabrics in the present invention;
Fig. 2 is the structural representation of vacuum drum drying equipment in the present invention;
Fig. 3 is the principle schematic of Screw Extrusion in the present invention;
Fig. 4 is the structural representation of screw extruder in the present invention;
Fig. 5 is the screw diameter structural representation of screw rod in the present invention;
Fig. 6 is the screw slenderness ratio structural representation of screw rod in the present invention;
Fig. 7 is the pitch structural representation of screw rod in the present invention;
Fig. 8 is the spiral groove depth structural representation of screw rod in the present invention;
Fig. 9 is the compression ratio structured schematic diagram of screw rod in the present invention;
Figure 10 is the assembly structure schematic diagram of screw rod and sleeve in the present invention;
Figure 11 is the structural representation of spinnerets in the present invention;
Figure 12 is the structural representation of spinneret orifice in the present invention;
Figure 13 is the structural representation of entrance lead angle α in the present invention;
Figure 14 is the assembly structure photo of girth member and finished product in the present invention;
Figure 15 is the photo of finished product in the present invention.
By reference to the accompanying drawings 1, in the embodiment of the present invention, Reference numeral is as follows:
1-hopper; 2-measuring pump; 3-manifold; 4-screw extruder; 5-cooling air; 6-drafting system; 7-reinforces spheroid; 8-sub-wire; 9-web forming device.
By reference to the accompanying drawings 2, in the embodiment of the present invention, Reference numeral is as follows:
1-vacuum draw part; 2-cuts into slices import and export; 3-swivel coupling; 4-passes into the interlayer of steam or conduction oil; 5-overhauls import and export.
By reference to the accompanying drawings 4, in the embodiment of the present invention, Reference numeral is as follows:
1-flange; 2-screw rod; 3-sleeve; 4-heating; 5-cast aluminium heating jacket; 6-cooling water pipe; 7-feed pipe; 8-hermetic unit; 9-transmission and gear.
Detailed description of the invention
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
According to the embodiment of the present invention, as shown in Fig. 1-Figure 15, provide a kind of preparation technology of nonwoven fabric.
To solve in PP cellular production process, technical scheme of the present invention mainly occurs that the technical problem of drip, drawing-off fracture of wire is for research purpose.By improvement of production process, solve drip, drawing-off fracture of wire technical problem, enhance productivity and product quality.Project implementation, coordinates removal vehicle seat cover production line, will bring for 200,000 cover high-quality removal vehicle seat cover/years for Liuzhou auto industry.
the overall goal of technical solution of the present invention, main contents and performance assessment criteria
Overall goal
Solve the drip, the drawing-off fracture of wire technical problem that occur in PP cellular production process, ensure that PP spunbonded nonwovens production line normally runs, and enhance productivity and product quality, make the annual production of wall scroll 1.6M polypropylene spunbonded nonwoven production line reach 1500 tons of nonwoven fabric, realize two production lines and produce 3000 tons of nonwoven fabric altogether per year; Coordinate enterprise's removal vehicle seat cover production line, form the production capacity produced removal vehicle seat cover 200,000 per year and overlap, realize the output value 3,600 ten thousand yuan.
main contents
PP section (raw material) sends into screw extruder, after melt extruded, filtration, metering, form as-spun fibre again through die head uniform distribution from spinneret orifice ejection; As-spun fibre, after air-flow cooling drawing-off, is placed on lapper lace curtaining by diffusor duct uniform spreading, the filament web formed thus, through hot rolling, winding, becomes nonwoven fabric after cutting.
---large spiral shell stalk high-temperature fusion is extruded, and------------------lace curtaining becomes net, and---------------packaging of weighing---finished product warehouse-in cut by the cloth that falls to winding to upper lower compression roller (reinforcing) to measuring pump (quantitatively carrying) to filter in milling train hot rolling (reinforcing) in air-flow traction in cooling in spinning (suction of spinning entrance up-down stretch) in spun-bonded non-woven fabrics technological process: polymer (polypropylene+feed back).See Fig. 1.
In FIG, comprise hopper 1, measuring pump 2, manifold 3, screw extruder 4, cooling air 5, drafting system 6, reinforce spheroid 7, sub-wire 8 and web forming device 9.
1, section is dried:
Object: remove moisture
Moisture section, especially can be hydrolyzed during PET melting, make molecular weight and molecular weight, affect into yarn quality.Water is at high temperature vaporized, and easily causes spinning break or lousiness.Improve degree of crystallinity and softening point, moisture PET section is impalpable structure, and softening point is low, and easily cause bonding resistance material phenomenon at the feeding section of screw rod, impact is normally produced.Impalpable structure section at a certain temperature can crystallization, and softening temperature improves.
Dry run:
First stage is the pre-crystallized stage, hot air temperature 120-150 DEG C; Second stage is drying stage, hot air temperature 160-180 DEG C.
Drying plant:
Vacuum drum drying equipment gets rid of air and moisture in drum in time, and can prevent thermal oxidative degradation of cutting into slices, dry mass is high.See Fig. 2.
In fig. 2, vacuum draw part 1, section import and export 2, swivel coupling 3, the interlayer 4 passing into steam or conduction oil and maintenance import and export 5 are comprised.
2, melt extruded: capital equipment is screw extruder.
Effect
Conveying: solid and melt are pushed ahead by the rotation of screw rod
Melting: section is melted by the heating element heater outside sleeve
Mixing, homogenizing: temperature, composition are evenly distributed
Screw rod divides three sections: feed zone, compression section (melt zone), metering section.
After section enters screw rod, be first transferred and preheating in screw feed section, then also melt gradually through the compacting of screw compression section, exhaust, then mixed plasticizing further in screw metering section, and reach certain temperature, be delivered to later process with certain pressure.
Screw Extrusion, see Fig. 3.
The feature of screw extruder is mainly reflected on screw-rod structure, has the equidistant dark screw rod such as not, constant depth variable pitch screw and not constant depth variable pitch screw.The equidistant dark screw rod such as or not main application in actual production, it has again four kinds of forms: long district gradation type screw rod, short district gradation type screw rod, saltant type screw rod and metering type screw.The architectural feature of screw rod, as screw diameter, draw ratio, screw rod segmentation and section length, compression ratio, pitch and spiral groove depth etc., determines the operating characteristic of screw extruder.See Fig. 4.
In the diagram, flange 1, screw rod 2, sleeve 3, heating 4, cast aluminium heating jacket 5, cooling water pipe 6, feed pipe 7, hermetic unit 8 and transmission and gear 9 is comprised.
The basic parameter of screw rod:
1), screw diameter
Be often referred to the external diameter of screw rod, have conclusive impact, enlarged diameter on extruder, extruder output increases, but heating and driving energy consumption all increase.See Fig. 5.
2), screw slenderness ratio L/D
L/D: the ratio of active length (not comprising torpedo head and annex) and external diameter.
L/D ↑: fusing time increases, and screw speed and production capacity can improve.
L/D is excessive, thermosensitive polymer meeting excessive degradation; Screw rod deadweight increases, and cantilever degree is large, and driving power is large.
Polypropylene spun bonding L/D >=30:1, polyamide and polyester L/D >=24:1.See Fig. 6.
3), pitch S
Screw diameter one timing, pitch (S) determines the helical angle of screw rod, affects the propulsive force of screw thread.See Fig. 7.
4), spiral groove depth H
For conventional three sections of screw rods:
Feeding section screw channel is dark, and H is constant;
Compression section screw channel volume is gradually little, is generally uniform pitch, and H is gradually little;
Metering section also claims homogenizing zone, and screw channel is shallow, and H is constant.
Screw channel is dark, and output is large; Screw channel is shallow, and output is little, but plastication is good, and extrusion capacity is stablized.See Fig. 8.
5), compression ratio
Refer to the ratio of charging aperture place last screw channel volume and metering section first screw channel volume.
The physical compression ratio of compression ratio and material (volume ratio after loose solid-state volume and melting) will adapt.ε is larger, and the squeezing action that polymer is subject to is larger, and usual ε is at 2.5-3.5.See Fig. 9.
6) gap, between screw rod and sleeve
Leakage current amount is directly proportional to the cube in gap, under guarantee screw rod and sleeve do not produce the condition of scraped finish, should adopt less gap as far as possible.See Figure 10.Double screw extruder can economize energy improve the quality of product.
3, spinning
Section is placed in hopper, enters Spinning pumps, then extrude from spinnerets and be cooled to silk after screw extruding fusing.Suitable master batch can be added in hopper as colored product or functional product (as antistatic, fire-retardant etc.) will be produced simultaneously.
Important spinning components:
1) measuring pump
Accurate measurement polymer, continus convergence melt, guarantees that melt can be extruded from spinning head.Measuring pump is external gear intermeshing gear pump.
Be out of gear place for feed zone, and melt to circle output along the inwall in " 8 " font hole under the drive of gear, and namely gears meshing place is discharge zone.
2) nozzle block
Be made up of filter, distribution plate and spinnerets etc.Remove the impurity in melt and melt is evenly spread in each aperture of spinneret orifice and go to form melt stream.
Filter: impurity screening, prevents from blocking spinneret orifice.
Spinnerets: steel plate is beaten several hole is core component.
1. the spinneret pore structure of spinnerets
Spinneret orifice is primarily of guide hole and micropore composition.
Guide hole: guide melt continuously and smoothly to enter micropore, avoids at generation dead angle, porch and occurs circinate melt.
Micropore: aperture is determined according to the fineness etc. of melt flow, viscosity and silk.See Figure 11.
2. the hole count of spinneret orifice
Determine according to type of polymer and filament linear density.Quenching difficulty as PP, spinneret orifice should be less; Filament linear density is large, and hole is few.
The average spinneret orifice number of spun-bond process must be greater than 1000 holes/m, and hole count increases, and is conducive to into all even output increased of net.
Melt is extruded from spinneret orifice, and experience becomes a mandarin, micropore flowing, go out stream, distortion and stable Rheologic.See Figure 12.
Become a mandarin: melt clamp-ons less hole from the space that diameter is larger, and flowing velocity sharply increases, kinetic energy increases, and stores certain elastic deformation energy, is called " entry-end effect ".When the deformation stored exceedes certain limit, the steady flow of melt will be affected.α is less for entrance lead angle, and the flowing of melt is more stable.See Figure 13.
Micropore flows: little near hole wall flow velocity, and hole central speed is large, there is radial velocity gradient.Radial velocity gradient makes high elastic deformation increase, and the little velocity gradient in aperture is large.The larger spinning of micropore is more stable.Micro-pore diameter general 0.3-0.5mm when spinning PP.
Go out stream: melt extrudes rear generation " expanded swell " phenomenon from micropore, and its reason is the rapid recovery of high elastic deformation.Melt fracture when expanding serious.Increase the draw ratio (L/d is 1.5 ~ 10) of micropore, raise spinning temperature, expanded phenomenon can be reduced.
Distortion is with stable: when melt leaves outlet area, have mobility, deformed in tension; Air flow effect, melt viscosity increases, and thread solidifies fibroblast gradually.Cooling condition has conclusive impact to the fineness of fiber, elongation and uniformity.
Stretch
Object: make large molecule along fiber axially-aligned, namely improve the degree of orientation, thus the tensile property, the ABRASION RESISTANCE that improve fiber, reach required fineness.
Drafting system: air drawing--utilize high velocity air to carry out drawing-off to the friction of strand.Adopt malleation drawing-off: air-flow forms stretching air-flow from top winding-up, and have nozzle drawing-off and narrow slit drawing-off, air velocity reaches 3000-4000m/min or higher in form.
Sub-wire
Adhesion or entanglement mutually between fiber during for preventing into net, tow need scatter, and during drawing-off, tow is through high-voltage electrostatic field or frictional electrification, and silk repels mutually because of band like charges, reaches the object of sub-wire.
Lapping
By the turbulent flow that stretching air-flow is formed in drawing passageway exit, long filament image planes yarn is equally fallen on solidifying lace curtaining.
Inhale net
Long filament uniform adsorption high speed fallen, on lace curtaining, rebounds after preventing long filament and a part of airflow strikes to lace curtaining, destroys the uniformity of fibre web.
7) reinforce
Hot calendering bonding: utilize the steel rider of a pair heat (a colored roller, a smooth roll) to carry out heating pressurization to fibre web, cause part fibers melt in fibre web and produce bonding and become non-weaving cloth.Bounding point place is fiber melting to be bonded surrounding annulus, and non-bonding place keeps the original form of fiber and performance.Therefore, product is a line shape, has good flexibility, gas permeability and elasticity.See Figure 14 and Figure 15.
4, quasi-solution is determined key technical problem
Affect factor and the effect of slit air drawing
The as-spun fibre brute force extruding postforming from spinneret orifice is low, extends large, structure extremely unstable.The object of air drawing allows the platelet of the molecule long-chain and crystalline high polymer that form fiber along fiber axial orientation, improves the tensile property of fiber, ABRASION RESISTANCE and required fibre fineness.Air drawing mainly completes between spinnerets and slit, and the attenuating drawing-down of strand mainly occurs between spinnerets wire vent face and solidification point, is therefore formed in the drawing process of macromolecular orientation also mainly between spinnerets wire vent face and solidification point.Theoretical according to spun orientation, spinning tension is the key of fiber-wall-element model, and following factors can affect the size of its drawing-off active force and orientation:
4.1 air velocity
Improve air-cooler speed, air velocity increases, and strand speed under the effect of frictional force also can increase, the corresponding increase of spinline tension; When air-cooler speed is constant, reduce the speed that slit width also can improve air-flow, thus improve drawing-off effect; Otherwise then can reduce drawing-off effect.In addition, under slit width and the constant condition of fan pressure head, increase the speed that suction air quantity will improve attenuating blast significantly, drawing-off effect improves.But it should be noted that the large young pathbreaker mending air quantity directly affects pressure and the flow of attenuating blast in air channel, therefore should coordinate with suction air quantity and regulate.
The density of 4.2 attenuating blasts
In the technique that we are early stage, have employed negative pressure drawing-off, attenuating blast density is lower, is also the factor causing its drawing-off effect insufficient.In malleation drawing-off mode, in air channel, the density of air-flow is relevant to the blast of side-blown bellows, improve drawing-off effect, the brute force improving fiber just must improve the performance of air-cooler, and the blower fan selecting supporting air quantity and pressure head is with it the key reaching air drawing effect.Air-cooler pressure is brought up to 9000Pa by original 5000Pa in my company's improved equipment, fabric quality has had and has significantly improved, therefore visible, adopts malleation drawing-off, will be conducive to raising drawing-off effect, and improve brute force and the elongation characteristics of fiber.
The specific area of 4.3 fibers
Improve the specific area of fiber, be also conducive to improving drawing-off usefulness.Owing to considering the factor of cost, spinneret orifice used on General Production Lines is all circular, according to special-shaped spinneret orifice, as star or Y shape etc., greatly can improve the specific area of strand, improve drawing-off usefulness under same Denier.Adopt special-shaped spinneret orifice also can improve the elasticity, gloss, anti-pilling, ABRASION RESISTANCE etc. of fiber.So adopt special-shaped spinneret orifice to improve the effective way of fiber and non-weaving cloth performance beyond doubt in spunbond process.
Except raising spinning tension, melt extrusion speed and cooldown rate also can affect the formation of orientation in strand, also have material impact to the final performance of fiber.In lateral blowing cold wind air quantity and cold wind pressure one timing, extruded velocity improves, and can reduce strand drawing-off effect; And cool too quickly, equally also can reduce the drawing-off effect to strand, so attenuating blast speed should match with melt extrusion speed and cooling air temperature with the selection of slit width, just can obtain good drawing-off effect.Both ensured not produce too much fracture of wire, and ensured that again strand obtains abundant drawing-off, obtain the higher degree of orientation, thus improved the product quality of strand and nonwoven fabric.
In 4.4 productions, drip can cause following harm
Drip causes irregular, blocked, the non-woven cloth cover of lapping curtain in lapping local to have hole or seriously irregular; Cause suction air irregular, thus cause strand fineness-unevenness and wire side irregular; There is impact to hot-rolling mill, the decorative pattern on colored roller can be damaged.
5, innovative point
(1) adopt lost foam casting process casting spinning spinneret, can make that spinnerets meter accuracy is high, face is bright and clean, internal flaw greatly reduces, cast structure is fine and close, improve the quality of spinneret orifice, reduce and occur that drip phenomenon appears in spinneret orifice blocking.
(2) adopt special-shaped spinneret orifice, as star or Y shape etc., greatly can improve the specific area of strand under same Denier, improve drawing-off usefulness.Adopt special-shaped spinneret orifice also can improve the elasticity, gloss, anti-pilling, ABRASION RESISTANCE etc. of fiber.
(3) change the feeding mode of waste material, reduce entering and passing through to increase the rotating speed of driving screw of gas, the method for discharging gas in melt in screw extruder improves fracture of wire phenomenon.
(4) in PP section, be mixed into about 2.4% antistatic master granule, nonwoven fabric can be made to have good antistatic effect, spun-bonded non-woven brute force can be made to decline, and extension at break first increases and then decreases.
Last it is noted that the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment to invention has been detailed description, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. a preparation technology for nonwoven fabric, is characterized in that, comprising:
Send into screw extruder after being dried by PP feed stock chip, after melt extruded, filtration, metering, form as-spun fibre through die head uniform distribution from spinneret orifice ejection again;
As-spun fibre, after air-flow cooling drawing-off, is placed on lapper lace curtaining by diffusor duct uniform spreading, the filament web of formation, through hot rolling, winding, becomes nonwoven fabric after cutting.
2. the preparation technology of nonwoven fabric according to claim 1, is characterized in that, described PP raw material, comprises polypropylene and feed back.
3. the preparation technology of nonwoven fabric according to claim 1 and 2, is characterized in that, described operation of being dried by PP feed stock chip, specifically comprises:
Dry run: the first stage is the pre-crystallized stage, hot air temperature 120-150 DEG C; Second stage is drying stage, hot air temperature 160-180 DEG C;
Drying plant: vacuum drum drying equipment gets rid of air and moisture in drum in time, and can prevent thermal oxidative degradation of cutting into slices, dry mass is high.
4. the preparation technology of nonwoven fabric according to claim 1 and 2, is characterized in that, the operation of described melt extruded, specifically comprises:
After section enters screw rod, be first transferred and preheating in screw feed section, then also melt gradually through the compacting of screw compression section, exhaust, then mixed plasticizing further in screw metering section, and reach default temperature, be delivered to later process with the pressure preset.
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| CN107053700A (en) * | 2017-05-04 | 2017-08-18 | 北京化工大学 | The preparation method and device of a kind of continuous fiber reinforced thermoplastic resin |
| CN107128051A (en) * | 2017-06-21 | 2017-09-05 | 深圳市三上高分子环保新材料股份有限公司 | Pre-coating film and its manufacture method and device systems with pile effects |
| CN107245811A (en) * | 2017-06-16 | 2017-10-13 | 山东康洁非织造布有限公司 | A kind of Spunbonded Nonwovens production technology |
| CN108166160A (en) * | 2017-12-25 | 2018-06-15 | 崇义县威骏高分子功能材料科技有限公司 | A kind of preparation process of agriculture and garden ecological, environmental protective polypropylene non-woven fabric |
| CN108265392A (en) * | 2017-12-22 | 2018-07-10 | 五邑大学 | A kind of preparation method of bloom oxidative stability reinforced polypropylene non-woven fabrics |
| CN108517620A (en) * | 2018-03-06 | 2018-09-11 | 吴德武 | A kind of non-woven fabrics and its manufacturing method |
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| CN111996670A (en) * | 2020-08-21 | 2020-11-27 | 北自所(常州)科技发展有限公司 | Production process for forming non-woven fabric |
| CN114262988A (en) * | 2021-12-30 | 2022-04-01 | 宜宾丝丽雅集团有限公司 | Preparation process of spunbonded fabric |
| WO2022104644A1 (en) * | 2020-11-19 | 2022-05-27 | 蔡欣航 | Method for manufacturing composite fiber article |
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| CN111850838A (en) * | 2019-04-03 | 2020-10-30 | 浙江天润无纺布有限公司 | Non-woven fabric production process |
| CN110592808A (en) * | 2019-09-02 | 2019-12-20 | 中科纺织研究院（青岛）有限公司 | Alga modified PP spunbonded non-woven fabric |
| CN110670367A (en) * | 2019-10-08 | 2020-01-10 | 江阴市东立新材料科技有限公司 | Production process of PE/PP composite material suitable for coating non-transfer glue |
| CN110670367B (en) * | 2019-10-08 | 2022-05-27 | 江阴市东立新材料科技有限公司 | Production process of PE/PP composite material suitable for coating non-transfer glue |
| CN111996670A (en) * | 2020-08-21 | 2020-11-27 | 北自所(常州)科技发展有限公司 | Production process for forming non-woven fabric |
| WO2022104644A1 (en) * | 2020-11-19 | 2022-05-27 | 蔡欣航 | Method for manufacturing composite fiber article |
| CN114262988A (en) * | 2021-12-30 | 2022-04-01 | 宜宾丝丽雅集团有限公司 | Preparation process of spunbonded fabric |
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