CN1096508C - Industrial yarn PA 6.6 with little cotton waste - Google Patents
Industrial yarn PA 6.6 with little cotton waste Download PDFInfo
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- CN1096508C CN1096508C CN97182384A CN97182384A CN1096508C CN 1096508 C CN1096508 C CN 1096508C CN 97182384 A CN97182384 A CN 97182384A CN 97182384 A CN97182384 A CN 97182384A CN 1096508 C CN1096508 C CN 1096508C
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- lousiness
- tex
- industrial yarn
- yarn
- moisture
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Abstract
The present invention relates to an industrial yarn PA 6.6 which comprises filament yarns of which the total fineness is at least 900 to 2100 d tex. The industrial yarn PA 6.6 is made of wet granulates PA 6.6 through a melt spinning process. The strength of the industrial yarn PA 6.6 is larger than 84 CN/tex, and the split filaments are less than 1.5 split filament/km. The industrial yarn PA 6.6 is preferably suitable for manufacturing cord fabrics in rubber use.
Description
The present invention relates to polyamide 66 (PA66) industrial yarn, it is that 900 to 2100dtex long filament is formed by total fiber number, is that the PA66 of particle relative viscosity RV＞75 makes winding speed V adding under the situation of entry by the melt spinning drawing-off
SPMust meet the following conditions:
V
SP＝(Ft
o/Ft
x)
3×V
SPo
Ft=intensity wherein, Ft
o=84CN/tex,
Ft
x=active strength is represented with CN/tex,
V
SPO＝2750m/min (1)
And the manufacture method that relates to the industrial yarn of low lousiness.
The lousiness level is also represented the important quality sign of industrial yarn except the monofilament method of testing.Winding speed during greater than 2750m/min the polyamide industrial yarn have too high lousiness level usually, its order of magnitude is greater than 1.5 lousiness/km.So far must lower spinning speed for reducing the lousiness number, but this causes again production capacity to reduce.Found once that strong the depending on except spinning and winding speed of lousiness level was transported to the moisture of the polyamide polymer of extruder.
As everyone knows, the PA66 polymer is humidification before extruder or in melt, its objective is to guarantee stable melt quality, humidification be to regulate or directly be metered into water by wet nitrogen, the melt pressure before this Spinning pumps can be used as the adjusting parameter.
From the fusible as can be known polyamide of EP-B-0092898 by adding the influence of moisture depolymerization to its physical property.Keep viscosity constant by adding water there.Its task is to make the polymer melt of stablizing physical property.
Task of the present invention is, the PA66 industrial yarn that provides intensity to be at least 84 CN/tex, and this yarn has minimum lousiness man-hour in fast as far as possible adding.
By this task of the present invention is such solution, and PA66 yarn strength＞84CN/tex is less than 1.5 lousiness/km with having.
Have particle relative viscosity RV＞90, in the variant of moisture＞0.06% and intensity Ft＞90 CN/tex, can be at spinning speed V
SPOGreater than the industry silk that obtains high fiber number and astonishing low lousiness number under the spinning speed that is calculated by formula (1), the lousiness number is corresponding to following formula:
Lousiness F1＜(Ft
x/ Ft
o)
3* Vspx/Vspo * Tt
x/ Tto (2)
Tt wherein
o=fiber number 940 and Tt
xIt is the fiber number when being illustrated in winding speed and being Vspx.
Its advantage is low lousiness level, and this is in the PA66 polymer beads that adopts, otherwise only just can reach at very low spinning draft speed.
Particularly advantageously be, at the water content of extruder prepolymer particle in 0.04 to 0.14% (weight), particularly in 0.06 to 0.12% (weight) scope.
The present invention further specifies by means of an example.
After-condensation adds the different water yields to the polyamide 66 polymer of relative viscosity (RV) about 93 before extruder, total moisture of the polymer that obtains like this changes between 0.16 and 0.02%.Winding speed is 2750m/min in all batches.Throughput is the constant 46kg/h that is.Intensity Ft is that 85CN/tex is constant equally.
The mensuration of the relative viscosity of particle is to be undertaken by ASTM-method D789-81 in 90% formic acid.
Lousiness test is that the Warpstop4050 with German Protechna company carries out, and each test is done 24 packages and estimated.
The result is illustrated in Fig. 1.Fig. 1 is that the lousiness number is to the water content mapping of PA66 polymer beads before fusion.Curve 1 expression fiber number is 940 dtex, particle relative viscosity RV be 93 and throughput be the dependence of lousiness number and moisture in the industrial yarn made of 46kg/h.Curve 2 expression fiber numbers are 1400dtex, and other condition is the lousiness curve of the same industrial yarn all, and the trend of its lousiness curve is the same.
As also seeing from Fig. 1, the lousiness level is at first along with the moisture of feeding polymer increases sharply minimizing.In the polymer aqueous amount of taking out from drying machine is 0.02%, and the lousiness number was 5 lousiness/km when winding speed was 2750m/min.Be about at 0.09% o'clock in moisture, lousiness reaches minimum of a value surprisingly, and when continuing to increase moisture, the lousiness amount increases again strongly.
Other example is set forth in the table 1
*Do not add water
| Nr | Fiber number [dtex] | Winding speed Vsp [m/min] | Intensity [CN/tex] | Lousiness number/km | H 2O [％] |
| 1 | 1880 | 2260 | 92.6 | 1.7 | 0.08 |
| 2 | 1400 | 2040 | 94.2 | 1.6 | 0.08 |
| 3 | 2100 | 2050 | 92.7 | 2.0 | 0.08 |
| 4 | 1400 | 2750 | 84 | 3.5 * | 0.02 |
| 5 | 1400 | 2750 | 84 | 0.7 | 0.07 |
The yarn of enumerating in example 1-3 is that the yarn that SHT-yarn (super high strength yarns) is enumerated in example 4 and 5 is HT-yarn (high strength yarns).All polymer spinning in all examples with the relative viscosity RV93 of particle.
This shows that the lousiness number is less than 1.5 lousiness/km and can reaches when moisture 0.04-0.14%, the lousiness number is less than 1 lousiness/km and can reaches during from 0.08-0.11% in moisture.Compare with state-of-the art by polyamide yarn of the present invention and to have only its half lousiness number.This yarn preferably is applicable to the manufacturing cord fabric thread, is used for rubber uses, for example is applicable to make conveyer belt V-belt and doughnut.
Claims (2)
1.PA66 the manufacture method of industrial yarn, this yarn is that 900 to 2100dtex long filament is formed by total fiber number, its intensity＞84CN/tex and lousiness are less than 1.5 lousiness/km, the polyamide 66 that is particle relative viscosity RV＞75 is undertaken by the melt spinning drawing-off adding under the regimen condition, it is characterized in that, the moisture of PA66 polymer is 0.04-0.14% (weight) add water before extruder after, and this method is at winding speed V
SPMust satisfy and implement under the following condition:
V
SP＝(Ft
o/Ft
x)
3×V
SPO，
Ft=intensity wherein, Ft
o=84CN/tex
Ft
x=active strength is represented with CN/tex
V
SPO＝2750m/min (1)
2. by the method for claim 1, it is characterized in that, particle relative viscosity RV＞90, the lousiness number is equivalent to following formula when moisture＞0.06% and intensity Ft＞90CN/tex:
Lousiness F1＜(Ft
x/ Ft
o)
3* V
SPX/ V
SPO* Tt
x/ Tt
o, (2)
Tt wherein
oBe fiber number 940dtex and Tt
xBe that winding speed is V
SPXThe time fiber number.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97182384A CN1096508C (en) | 1997-09-22 | 1997-09-22 | Industrial yarn PA 6.6 with little cotton waste |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97182384A CN1096508C (en) | 1997-09-22 | 1997-09-22 | Industrial yarn PA 6.6 with little cotton waste |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1276027A CN1276027A (en) | 2000-12-06 |
| CN1096508C true CN1096508C (en) | 2002-12-18 |
Family
ID=5178440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97182384A Expired - Fee Related CN1096508C (en) | 1997-09-22 | 1997-09-22 | Industrial yarn PA 6.6 with little cotton waste |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1096508C (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0092898A2 (en) * | 1982-04-28 | 1983-11-02 | E.I. Du Pont De Nemours And Company | Process for remelting polyamides |
| WO1993005097A1 (en) * | 1991-09-03 | 1993-03-18 | Allied-Signal Inc. | A process for controlling the melt viscosity of polyamides during melt processing |
-
1997
- 1997-09-22 CN CN97182384A patent/CN1096508C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0092898A2 (en) * | 1982-04-28 | 1983-11-02 | E.I. Du Pont De Nemours And Company | Process for remelting polyamides |
| WO1993005097A1 (en) * | 1991-09-03 | 1993-03-18 | Allied-Signal Inc. | A process for controlling the melt viscosity of polyamides during melt processing |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1276027A (en) | 2000-12-06 |
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|---|---|---|---|
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| C14 | Grant of patent or utility model | ||
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