CN1177022A

CN1177022A - Method for mfg. multiple hellow shaped spinning plate

Info

Publication number: CN1177022A
Application number: CN 96116638
Authority: CN
Inventors: 王永亮; 陈凯年; 倪建华; 潘湘庆; 王依民
Original assignee: CHINESE TEXTILE UNIV; DUQUAN CHEMICAL FIBER EQUIPMENT FACTORY SHANGHAI
Current assignee: CHINESE TEXTILE UNIV; DUQUAN CHEMICAL FIBER EQUIPMENT FACTORY SHANGHAI
Priority date: 1996-12-26
Filing date: 1996-12-26
Publication date: 1998-03-25
Anticipated expiration: 2016-12-26
Also published as: CN1065928C

Abstract

The present invention relates to mfg. multiple hollow profiled spinning jet which is composed of 9 holes, more than 9 holes arc slit or 3 sets, more than 3 sets (each set is a overlapping arranged two circular slits each posseses of two gaps) overlapped circular slits. The above mentioned arc slits or overlapped sircular slits are arranged around a central symmetrically distributed multiple hollow profiled spinning jet. The fused polymer (PET, PP, PA etc.) is extruded out through the smaller and larger guide holes and slits of the spining jet, the 9 holes, more than 9 holes multiple hollow profiled fibre is formed through melt bulking, and cooling etc. By using said kind of spinning jet, multiple hollow filament or three dimensional curl shont staple with different hole shape can be spun out.

Description

The manufacturing of many hollow profiles spinnerets

The invention relates to the manufacturing of many hollow profiles spinnerets, be applicable to that multiple condensate (PET, PP, PA etc.) molten spinning prepares 9 holes, above many hollow profiles long filament or the staple fibre in 9 holes, the porous fibre that makes thus has fluffy, softness, advantage such as resilience is good.

It is the I-shaped slit that adopts two intersections (spinneretss of Fig. 1-a) that JP 79-112242 prepares four doughnuts, melt is earlier expanded after above-mentioned slit is extruded, shrink afterwards and cause intersecting the mutual adhesion of opening part melt of I-shaped slit and form hollow, thereby make four doughnuts (Fig. 1-b).Because the I-shaped slit that intersects constitutes foursquare spatial domain and intersects the effect of I-shaped slit melt cooling stress, causes forming hollow trend rectangle, and four holes are connected to each other, and cause the bulkiness and the elastic deficiency of this doughnut thus.

For improving above-mentioned defective, JP 94-67122 improves the hole shape of spinnerets, has adopted a leading hole to connect several guide holes, and inferior guide hole is connected with slit again, and melt flows into the spinneret orifice slit through leading hole, inferior guide hole, and (Fig. 2-a) also extrudes.Melt is extruded after-contraction from the slit mouth, causes the two ends of slit inter-adhesive, and closed loop forms hollow, melt is under the side-blown wind action, because ventilating surface and lee face cool off the different of degree, make it to produce the multidirectional opposite sex, finally become many doughnuts (Fig. 2-b) of three-dimensional crimp.Four holes that this spinnerets hole shape has solved previous many doughnut existence are connected as a single entity and non-circularization of pore-forming problem, but the distributed quantity of this kind narrow annular channel is subjected to the restriction of locus, the doughnut of multiform shape is that very big difficulty is arranged to preparing more, simultaneously its complicated slit not only difficulty but also valency height on its electrode is made.

The present invention is for design, makes the novel form of slits that 9 holes, many hollow profiles spinnerets more than 9 holes adopts and arrange.Can prepare many hollow profiled fibres (can be circular, also can be trilobal, five-pointed star shape, hexagon etc.) of different hole counts, different hole shapes according to the different purposes of fiber thus.

The key that the present invention solves has been to adopt unique shape of slit, has solved the melt closed loop, makes many hollow profiled fibres, makes the shape of slit simplify the accuracy of manufacture that has reduced manufacturing cost and improved slit greatly again.

According to the needs of fiber, to preparing 9 holes, admissible two class citation forms of many hollow profiled fibres more than 9 holes to hollow:

(1) fiber hollow hole count has adopted arcuate slots about 9 holes, and this arcuate slots is symmetrically distributed around a center.Can be distributed on the circumference, also can be distributed on several circumference (Fig. 3-a).

When above-mentioned arcuate slots was distributed on the circumference, the opening of arcuate slots was arranged along the clockwise or counterclockwise direction of circumference, and promptly the opening of arcuate slots is mutually adjacent with adjacent arc bow face, considers the closed loop of sticking body, and its spacing should be less than 0.3mm; The shape of arcuate slots can design the different arcuate slots and the distribution of slit respectively according to the requirement of fiber to the state size of abnormity and hole shape, and its shape of slit can be circle, ellipse or arbitrary curve.Consider that hole shape is good with the mechanical property of circle and easily manufactured, the reason such as cost is low of machined electrode, so arcuate slots should adopt circle.The width of arcuate slots can be selected according to the height of fiber Denier.Be the hole shape that guarantees hollow and melt closed loop successfully, dead break in the unlikely generation, slit width should be between 0.04mm--0.20mm; To preparing low dawn doughnut, slit width is more suitable between 0.04mm--0.075mm.

Above-mentioned slit links to each other with little guide hole, several little guide holes link to each other with leading hole again, the condensate of fusion is extruded through big guide hole, little guide hole and slit, melt is in the expanded after-contraction in the two ends of slit, make it to finish closed loop, forming 9 holes, many hollow profiled fibres (Fig. 3-b) more than 9 holes under the cooling of lateral blowing with the melt adhesion of adjacent arcuate slots bow face.

The shape of above-mentioned arcuate slots and arrange and to solve the difficulty that slit arrangement faced in the past, and overcome the too small spinnerets mechanical strength that causes in many hollow closed loop, the middle dead break that is prone to when being shaped or the gap between the narrow annular channel and descend; Excessively cause middle dead break.Owing to the arcuate slots simple shape, arrange regularly, simplified the manufacturing technique of spinnerets thus greatly and reduced production cost.

(2) fiber hollow hole count needs more for a long time, and spinnerets can adopt three groups, the shape slit of three groups above (every group is two narrow annular channels with two gaps, and arrangement overlaps each other), and above-mentioned three groups, more than three groups Many hollow profiles spinnerets that the shape slit constitutes around center symmetrical distribution (Fig. 4-a).

One of this plate features is that the abnormity of fiber is decided by The group number of shape slit, three groups of slits make Y shape 9 hole fibers, four groups

Slit makes four stars shape 12 hole fibers; Five groups of shape slits make five-pointed star shape 16 hole fibers; Six groups

Slit makes six stars, 19 hole fibers.

For reaching the good ring closure of melt,

Four gaps of the annular of shape slit are in always on the line, and this straight line is

The shape slit is around the ray at center, and its reason is can make cold air promptly reach the center to play good cooling effect, forms many doughnuts (Fig. 4-b).The size in gap directly influences pore-forming and closed loop again, thus should hang down many doughnuts of dawn in preparation less than 0.3mm, more suitable less than 0.25mm; According to the different requirements of fiber to hollow form and degree of hollowness, select different narrow annular channels, they can be circle, ellipse or arbitrary curve.Consider that four gap cooling velocities are different and cause and the difference of contraction cause the variation of pore-forming, for circular or near the requirement of circular doughnut, its slit annular should adopt ellipse; For the hole shape that makes the mesopore after the shaping keeps evenly, the lap area of two narrow annular channels of shape slit is equal to or slightly greater than non-overlapped part area.In order to make several groups The smooth closed loop of centre bore that slit centers on, minimum range between group should strictly be controlled, should be less than 0.06mm, and the width of narrow annular channel is decided on the dawn number of many doughnuts, generally be controlled between the 0.04mm-0.20mm, the width of more desirable slit is 0.06mm-0.10mm.

The present invention has adopted unique form of slits and slit arrangement, has solved to prepare the spinnerets processing difficulties that many doughnuts are faced more than 9 holes, 9 holes, and the hollow rate of fiber reaches 25-38%.The hollow forming of fiber is good, and fault remains on 40-60mg/100g, and the rebound degree of fiber can reach 88-92.5%.

Fig. 1. 4 hollow spray filament plates and doughnut schematic cross-section

1-a 4 hollow spray filament plates;

1-b 4 doughnut schematic cross-section Fig. 2. 5 hollow spray filament plates and doughnut schematic cross-section

2-a 5 hollow spray filament plates;

2-b 5 doughnut schematic cross-section Fig. 3. 9 hollow spray filament plates and doughnut cross-section photograph

3-a 9 hollow spray filament plates;

3-b 9 doughnut cross-section photograph Fig. 4. 16,19 hole spinneretss and doughnut cross-section photograph

4-a 16,19 hole spinneretss;

4-b 16,19 hole doughnut cross-section photograph Fig. 5. 4 hollow spray filament plates and doughnut cross-section photograph

5-a 4 hole spinneretss;

5-b 4 doughnut cross-section photograph

Example one

With viscosity is that (with phenol-tetrachloroethanes is solvent for 0.65 PET, under 25 ℃ of temperature, measure), adopt single screw rod (φ=80mm, L/D=25) and nozzle aperture shown in Figure 3 (spinnerets diameter phi 160mm, spinneret orifice is counted 90f, arcuate slots is circular, and slit width is 0.18mm) under 275-285 ℃, carry out melt spinning; Under spinnerets 8cm to sentence 16 ℃ of wind speed be 0.6m/s around, making monofilament was 7 dawn, total denier is the boundling silk at 650,000 dawn.In oil bath be 65 ℃ ring blowings with superheated vapor to melt spinning cool off thereafter; Rolling up with 600m/min speed is to carry out 4 times of stretchings under 120 ℃ of conditions, and relaxation processes is carried out in dry back under 110-120 ℃ steam, and (Fig. 3-b) is seen in the cross section for details to cut into the staple fibre of 51-65mm afterwards.It is empty good that the fiber of gained becomes, and hollow rate is 32.5%, and the rebound degree of fiber is 91.4%.Fault only is 30mg/100g, and the intensity of staple fibre is 4.1cN/dtex.Example two

(the spinnerets diameter is φ 90mm, and the spinneret orifice number is 60f, is two narrow annular channels with two gaps by 4 groups and 5 groups every group respectively, the arrangement that overlaps each other to adopt example one identical PET, single screw rod and 16 holes, 19 hole spinneretss shown in Figure 4 The shape slit, narrow annular channel is shaped as ellipse, slit width is 0.16mm), making 16 holes, the 19 hole staple fibres (cross section is seen Fig. 4-b1,4-b2 for details) that length is 51mm with identical spinning, stretching, drying condition, it is empty good that the gained fiber becomes, and do not see out the sky situation.

16, the hollow rate in 19 holes is respectively 34.2%, 36.7%, and the fiber resilience is respectively 92.4%, 94.2%; Fault is respectively 45mg/100g, 64mg/100g intensity is respectively 3.9cN/dtex, 3.89cN/dtex.Reference examples

(the spinnerets diameter is φ 180mm to adopt example one identical PET, single screw rod and 4 hole spinneretss shown in Figure 5, spinneret orifice is counted 210f, slit width is 0.18mm) with spinning, stretching and the drying process of same instance one, (cross section sees that Fig. 5-b), its hollow rate is 29.8% for details to make length and be the 4 hole staple fibres of 51mm; Fiber rebound degree 84%, fault are 41.2mg/100g, and staple fibre intensity is 4.2cN/dtex.

Claims

1. one by being provided with many hollow spray filament plate that gap, discontinuous arrangement form closed annular between several slits, it is characterized in that: by 9, arcuate slots more than 9 or three groups, more than three groups (every group is two narrow annular channels with two gaps, and arrangement overlaps each other)

Arcuate slots, above-mentioned arcuate slots with Many hollow profiles spinnerets that the shape slit is symmetrically distributed and constitutes around a center.

2. by described 9 holes of claim 1, the above arcuate slots in 9 holes, it is characterized in that: arc is circle, ellipse or arbitrary curve; More desirable shape is circular.

3. by described 9 holes of claim 1, the above arcuate slots in 9 holes, it is characterized in that: the breach of arc is mutually adjacent with adjacent arc bow face, and its spacing should be less than 0.25mm.

4. by described 9 holes of claim 1, the above arcuate slots in 9 holes, it is characterized in that: the slit width of arc is 0.04mm--0.2mm, and more desirable slit width is 0.06mm--0.10mm.

5. by described three groups, three groups of claims 1 above (every group is two narrow annular channels with two gaps, and arrangement overlaps each other) The shape slit is characterized in that: annular is circle, ellipse or arbitrary curve; More desirable form is oval.

6. by claim 1,5 described three groups, three groups above (every group is two narrow annular channels with two gaps, and arrangement overlaps each other)

The shape slit is characterized in that: two annular lap areas should be equal to or greater than its non-overlapped part area.

7. by claim 1,5 described three groups, three groups above (every group is two narrow annular channels with two gaps, and arrangement overlaps each other) The shape slit is characterized in that: four gaps of two annulars be distributed in by On the ray at shape center that slit centers on; The gap of narrow annular channel is less than 0.3mm, and more desirable gap is less than 0.25mm.

8. by claim 1,5 described three groups, three groups above (every group is two narrow annular channels with two gaps, and arrangement overlaps each other) The shape slit is symmetrically distributed around the center, and it is characterized in that: the minimum range between group is less than 0.06mm.

9. by claim 1,5 described three groups, three groups above (every group is two narrow annular channels with two gaps, and arrangement overlaps each other) The shape slit is characterized in that: slit width is 0.04mm-0.2mm, and more desirable slit width is 0.06mm-0.10mm.