CN1065928C

CN1065928C - Method for mfg. multiple hellow shaped spinning plate

Info

Publication number: CN1065928C
Application number: CN96116638A
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: 2001-05-16
Anticipated expiration: 2016-12-26
Also published as: CN1177022A

Abstract

本发明是多中空异形喷丝板，属纤维制造类。它是由(1)9个、9个以上的弧形狭缝；(2)三组、三组以上每组为二个各具有二个间隙的环形狭缝，彼此重叠排列的形狭缝。组成单一喷丝孔形。由上述二种喷丝孔形对称分布在喷丝板上构成了多中空异形喷丝板(见附图3-a)，熔融聚合体(PET，PP等)经喷丝孔挤出，经熔体膨化，闭环和冷却形成9孔、9孔以上的多中空异形纤维。采用该类喷丝板可纺制多种孔形的多中空长丝或三维卷曲短纤维。The invention relates to a multi-hollow special-shaped spinneret, which belongs to the category of fiber manufacturing. It is composed of (1) 9 or more arc-shaped slits; (2) three groups or more than three groups, each of which is two annular slits with two gaps, -shaped slits arranged overlapping each other . Form a single spinneret hole shape. The above-mentioned two kinds of spinneret holes are symmetrically distributed on the spinneret to form a multi-hollow special-shaped spinneret (see Figure 3-a). The molten polymer (PET, PP, etc.) is extruded through the spinneret holes, and melted Body puffing, closed loop and cooling to form multi-hollow special-shaped fibers with 9 or more holes. This type of spinneret can be used to spin multi-hollow filaments with various hole shapes or three-dimensional crimped short fibers.

Description

Many hollow profiles spinnerets

The invention relates to many hollow profiles spinnerets.Be applicable to that multiple condensate (PET, PP, PA etc.) melt-spun prepares 9 holes, 9 holes above many hollow profiles long filament or staple fibre, it is fluffy that the porous fibre that makes thus has, softness, advantage such as resilience is good.

It is the I-shaped that adopts two intersections (spinneretss of Fig. 1-a) that JP79-112242 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 with each other, and cause the bulkiness and the elastic deficiency of this doughnut thus.

For improving above-mentioned defective, JP94-67122 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 back expanded after-contraction earlier 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 it is different that ventilating surface and lee face cool off degree, makes it to produce the heterogeneous opposite sex, finally become many doughnuts (Fig. 2-b) of three-dimensional crimp.The four company holes that this spinnerets shape has solved previous many doughnut existence are one 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) during fiber hollow hole count 9 holes, adopted arcuate slots, 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 0.25mm; 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 0.06-0.10mm.Above-mentioned every group

Slit links to each other with little guide hole, and several little guide holes link to each other with leading hole again, form many hollow profiles spinnerets.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 the too small spinnerets mechanical strength that causes of middle dead break or the gap between the narrow annular channel that is prone to when having overcome many hollow closed loop, moulding descends; 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, more than three groups, and every group is two narrow annular channels with two gaps, the narrow annular channel that overlaps each other and arrange, and above-mentioned three groups, three groups are above

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 Slit makes 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 shape slit are in always on the line, and this straight line is

Shape slit 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 circle table doughnut, its slit annular should adopt oval: for the hole shape maintenance that makes the mesopore after the shaping even, 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, the minimum range between group should strictly be controlled, should be less than 0.06mm.The width of narrow annular channel is decided on the dawn number of many doughnuts, generally is controlled between the 0.04mm-0.20mm, and 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 40-60/100g, and the rebound degree of fiber can reach 88-92.5%.

Fig. 1 .4 hollow spray filament plate spinneret orifice and gained doughnut schematic cross-section (JP79-112243)

1-a 4 hollow spray silk hole shapes

1-b 4 doughnut schematic cross-sections

1-c 4 doughnut photos

Fig. 2 .5 hollow spray filament plate spinneret orifice shape and gained doughnut schematic cross-section (JP94-67122)

2-a 5 hollow spray silk hole shapes;

2-b 5 doughnut schematic cross-sections

Fig. 3 .9 hollow spray filament plate spinneret orifice shape and gained doughnut cross-section photograph ()

3-a 9 hollow spray silk hole shapes

3-b 9 doughnut cross-section photograph

Fig. 4. many hollow spray filament plate spinneret orifice shape and gained doughnut cross-section photograph ()

4-a1 16 hole spinneret orifice shapes

4-a2 gained 16 hole doughnut cross-section photograph

4-b1 19 hole spinneret orifice shapes

4-b2 gained 19 hole 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 of phi 160mm, spinneret orifice is counted 90f, arcuate slots is circular, and a spray silk 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, make 7 dawn of monofilament, total denier is 650,000 dawn boundling silks.In the ring blowing of oil bath 65 ℃ and superheated vapor melt spinning cooled 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, hollow rate 32.5%, and the rebound degree of fiber is 91.4%.Fault only is 30mg/100g, and the intensity of staple fibre is 4.1 cN/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, arranges 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, and slit width is 0.16mm), make 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, and intensity is respectively 3.9 cN/dtex, 3.89 cN/dtex.

Reference examples

(the spinnerets diameter is Φ 180mm to adopt 4 hole spinneretss shown in example one identical PET, single screw rod and Fig. 1-a, 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. 1-c), 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 4.2 cN/dtex.

Claims

1. A multi-hollow spinneret with gaps between several slits arranged discontinuously to form a closed ring, characterized in that: (1) 9 or more arc-shaped slits surround the center of the spinneret It consists of a single multi-hollow special-shaped spinneret hole formed by symmetrical distribution; (2) It consists of three groups or more than three groups (each group is two arc-shaped slits with two gaps, which are arranged overlapping each other)

The arc-shaped slits are symmetrically distributed around the center of the spinneret hole and form a single multi-hollow special-shaped spinneret hole shape. The above two kinds of hole shapes are symmetrically and evenly distributed on the surface of the circular or rectangular spinneret, thereby forming a multi-hollow special-shaped spinneret.

2. According to claim 1, a multi-hollow spinneret with gaps between several slits arranged non-continuously to form a closed ring is characterized in that: it is surrounded by 9 or more arc-shaped slits A single multi-hollow special-shaped spinneret hole composed of a symmetrical distribution of the center of the spinneret, the shape of the arc slit is a circle, an ellipse or an arbitrary curve, and a more preferable shape is a circle.

3. According to claim 1 or 2, a multi-hollow spinneret with gaps between several slits arranged discontinuously to form a closed ring is characterized in that: there are 9 or more arc-shaped slits The slots are symmetrically distributed around the center of the spinneret to form a single multi-hollow special-shaped spinneret hole. The arc-shaped gap is close to the adjacent arc-shaped arch surface, and the distance should be less than 0.25mm.

4. According to claim 1 or 2, a multi-hollow spinneret with gaps between several slits arranged discontinuously to form a closed ring is characterized in that: there are 9 or more arc-shaped slits A single multi-hollow special-shaped spinneret hole composed of slits symmetrically distributed around the center of the spinneret. The width of the arc-shaped slit is 0.04-0.2mm, and the more preferable slit width is 0.06-0.10mm.

5. According to claim 1, a multi-hollow spinneret with gaps between several slits arranged non-continuously to form a closed ring is characterized in that: each group consists of three groups, and each group is two or more. Curved slits with two gaps arranged on top of each other The arc-shaped slit is a single multi-hollow special-shaped spinneret formed by symmetrical distribution around the center of the spinneret hole. The shape of the circular slit is a circle, an ellipse or an arbitrary curve, and the more preferable shape is an ellipse.

6. According to claim 1 or 5, a multi-hollow spinneret with gaps between several slits arranged non-continuously to form a closed ring is characterized in that: there are three groups, and each group is two arc-shaped slits with two gaps each, arranged overlapping each other The arc-shaped slits are symmetrically distributed around the center of the spinneret hole and are composed of a single multi-hollow special-shaped spinneret hole, and the overlapping area of the two annular slits is equal to or greater than the area of the non-overlapping portion.

7. According to claim 1 or 5, a multi-hollow spinneret with gaps between several slits arranged non-continuously to form a closed ring is characterized in that: there are three groups, and each group is two arc-shaped slits with two gaps each, arranged overlapping each other A single multi-hollow special-shaped spinneret composed of arc-shaped slits symmetrically distributed around the center of the spinneret hole, each group is two annular rings with two gaps each The 9 gaps in the slits are distributed on the ray centered on the center of the spinneret hole, and the gaps of the annular slits are less than 0.3mm, and more preferably, the gaps are less than 0.25mm.

8. According to claim 1 or 5, a multi-hollow spinneret with gaps between several slits arranged non-continuously to form a closed ring is characterized in that: there are three groups, and each group is two arc-shaped slits with two gaps each, arranged overlapping each other

The arc-shaped slits are symmetrically distributed around the center of the spinneret hole and form a single multi-hollow special-shaped spinneret hole, and the minimum distance between the groups is less than 0.06mm.

9. According to claim 1 or 5, a multi-hollow spinneret with gaps between several slits arranged non-continuously to form a closed ring is characterized in that: there are three groups, and each group is two arc-shaped slits with two gaps each, arranged overlapping each other A single multi-hollow special-shaped spinneret hole composed of arc-shaped slits symmetrically distributed around the center of the spinneret hole. 0.10mm.