CN113957550A - Stroke sectional type hydraulic plunger wire extruding method - Google Patents
Stroke sectional type hydraulic plunger wire extruding method Download PDFInfo
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- CN113957550A CN113957550A CN202111054621.4A CN202111054621A CN113957550A CN 113957550 A CN113957550 A CN 113957550A CN 202111054621 A CN202111054621 A CN 202111054621A CN 113957550 A CN113957550 A CN 113957550A
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- plunger
- pushing
- stroke
- ptfe
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/08—Melt spinning methods
Abstract
The invention relates to the technical field of polytetrafluoroethylene processing, and discloses a stroke sectional type hydraulic plunger wire extruding method, which comprises the following steps: s1, feeding the PTFE blank into a plunger cavity of a plunger extrusion device which is divided into a plurality of stroke stages; s2, presetting parameters of plunger pressure and pushing speed at each stroke stage according to design values, and programming and controlling by adopting a PLC module; s3, extruding and molding the PTFE raw filament by plunger type pushing and pressing, and then degreasing, sintering and hot stretching the extruded PTFE raw filament to obtain the molded PTFE monofilament with the monofilament breakage rate less than 10%. According to the invention, the PTFE blank is pushed and pressed through the plunger cavity of the plunger extrusion device, so that the PTFE blank is not sheared and scraped, and linear molecules are prevented from being blocked by the large profiled fiberization particles in the fiber forming process in the monofilament knotting process, thereby well avoiding the occurrence of broken ends in the hot drawing of the monofilament in the subsequent process and improving the monofilament production rate.
Description
Technical Field
The invention relates to the technical field of polytetrafluoroethylene processing, in particular to a stroke sectional type hydraulic plunger wire extruding method.
Background
The Polytetrafluoroethylene (PTFE) material is called as 'plastics king' because of excellent chemical resistance, corrosion resistance and temperature resistance, and various fiber materials of the PTFE can be produced in recent years under the pull of the rapid development of the fluorine chemical industry in China and the urgent requirements of the environmental protection application field, and the production and manufacturing technology is rapidly developed; the development situation that the polytetrafluoroethylene filament fiber is used as a preferable material for producing base cloth (framework material) of environment-friendly filtering needling and spunlace filtering materials, weaving liquid filtering screen meshes and producing high-temperature-resistant filtering bag sewing threads completely breaks through the blockade of production technologies abroad in recent years and the autonomous manufacturing technology is mature day by day makes various filament products widely applied to various industrial applications in China, particularly in the field of environment-friendly filtering, and the product technology is developed into a pattern at the top of the global similar product manufacturing technology and capacity scale, so that the international speaking right status of the products in the market is formed.
The theoretical melting point of the polytetrafluoroethylene material is 327 ℃, but the material has the characteristics of high viscosity and no liquid fluidity in a molten state, so that the polytetrafluoroethylene material is limited in that the traditional melt-blown spinning process of large chemical fibers cannot be used for producing fiber products; at present, two kinds of polytetrafluoroethylene monofilament production processes which are allowed and popular in our environment are basically available, one is that a paste compact is formed by mixing an extrusion aid (light white oil) and a polytetrafluoroethylene dispersing material according to a certain proportion, then a blank is rolled into a film belt, then the film belt is cut into filaments, and the filaments are made into monofilaments by thermoplastic forming processes such as degreasing (removing the extrusion aid), sintering and stretching; the other is that after the oily monofilament is extruded by paste, the monofilament is prepared by the hot plastic forming processes of degreasing, sintering, stretching and the like; the former is known in the industry as "membrane shredding", also known as flat filament; the latter are called "extruded filaments", also called round filaments; flat filaments are basically used as base cloth material for woven needle punched filter media; the round silk can be used for multiple purposes such as plying production of polytetrafluoroethylene filter bag sewing threads, weaving spunlace base cloth or liquid filter screen cloth and the like; because the polytetrafluoroethylene sewing thread produced by using the circular yarn stranding has the characteristics of good temperature resistance, excellent chemical resistance, full thread diameter, high wear resistance, high friction coefficient, good appearance characteristics and physical and mechanical properties such as good needle hole plugging performance after the filter bag is sewn, and the like, the polytetrafluoroethylene sewing thread is widely applied to the sewing of the high-temperature resistant filter bag; the spunlace filter material base cloth woven by using the round filaments can bear high-strength shearing force of water needle punching and keep the strength of more than 85%, and compared with the flat filaments, the strength of the flat filaments can only be kept about 30%, so that the round filament base cloth has obvious performance advantages in the spunlace high-end filter material; the liquid filtering screen cloth woven by the round filaments also has the advantages of stiff cloth cover, uniform filtering aperture, easy ash (mud) removal and the like; therefore, in the field of environmental-friendly filtration, the round monofilaments in the polytetrafluoroethylene filaments are a high-performance fiber material favored by filter material designers.
Chinese patent discloses a method for producing polytetrafluoroethylene long fiber (patent No. CN101074499A), which uses screw extrusion equipment to produce PTFE slit long fiber, and the obtained polytetrafluoroethylene long fiber can be made into monofilament long fiber and multi-strand long fiber, namely, can be woven into the base cloth of the cloth bag filter material of a bag type dust collector, and can also be made into a high-strength industrial sewing thread for sewing polytetrafluoroethylene cloth bag, so that the filter bag has a better service life, but the produced monofilament is easy to break in hot stretching, and the monofilament has larger deviation of thread density.
Disclosure of Invention
The invention aims to provide a stroke sectional type hydraulic plunger wire extruding method to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a stroke sectional type hydraulic plunger wire extruding method comprises the following steps:
s1, dividing the pushing stroke of the plunger extrusion device into a plurality of stages according to the length of the pre-pressed PTFE blank, and then sending the PTFE blank into a plunger cavity of the plunger extrusion device, wherein the plunger extrusion device uses a hydraulic system as pushing power, and the pushing mode adopts the pushing of the plunger in the cavity;
s2, presetting parameters of plunger pressure and pushing speed of each stroke stage according to design values, and adopting a PLC module to program and control the initial plunger pressure for pushing to be 5-8 Mpa and the corresponding pushing speed to be 50-70 mm/min; the pressure of the tail end plunger is 13-15 Mpa, and the corresponding pushing speed is 80-100 mm/min;
s3, extruding and forming the PTFE raw filament by plunger type pushing to obtain the polytetrafluoroethylene raw filament with the filament outlet speed controlled at 30-80 mm/min, the extrusion linear diameter controlled at 0.55-2.2 mm and the linear density controlled at 1000-5000 tex, and deoiling, sintering and hot stretching the extruded polytetrafluoroethylene raw filament to obtain the formed polytetrafluoroethylene monofilament with the monofilament breakage rate less than 10%.
As a still further scheme of the invention: the PTFE blank is set with different pressures and speeds at different extrusion stages, the ratio of the pressure to the speed is gradually decreased, and the parameter values of the pressures and the speeds are preset according to the gradual change principle of increasing pressure and decreasing speed so as to keep the filament outlet speed stable and the filament density uniform.
As a still further scheme of the invention: the hydraulic system comprises servo motor, oil pump, pressure sensor, oil tank, servo controller jointly, and the oil tank volume is 50 ~ 100L, and the oil pump is 3 ~ 8cc crescent gear pump, and pressure sensor measuring range is 0 ~ 25MPa, and servo motor is 2.5 ~ 5KW alternating current servo motor, and hydraulic pressure bulldozes pressure and is 5 ~ 5 Mpa.
As a still further scheme of the invention: the control mode of the plunger pushing stroke can adopt two modes of equal-quantity segmentation and unequal-quantity segmentation, wherein the equal-quantity segmentation is L/N, and the unequal-quantity segmentation is L1 and L2 … … Ln.
As a still further scheme of the invention: the plunger in the cavity can be pushed vertically by the cavity or horizontally by the cavity.
As a still further scheme of the invention: the inner diameter of a cavity of the plunger extrusion device is 10-50 mm, and the depth of the cavity is 200-600 mm; the diameter of the plunger is 9.9-49.9 mm; the caliber of the spinning nozzle is 0.5-2 mm, and the included angle of the cone flow guide of the combined part of the spinning nozzle and the cavity is 30-60 degrees.
As a still further scheme of the invention: the PTFE blank is paste prepared by mixing polytetrafluoroethylene fiber-grade dispersion resin and light white oil, and is extruded into a blank through a die, the length of the PTFE blank is 190-590 mm, and the density of the polytetrafluoroethylene fiber-grade dispersion resin is 2.18-2.19 g/cm3The flash point of the light white oil is 70-100 ℃.
Compared with the prior art, the invention has the beneficial effects that:
1. the PTFE blank is pushed and pressed through the plunger cavity of the plunger extrusion device, so that the PTFE blank is not sheared and scraped, linear molecules are prevented from being blocked by the large profiled fiberization particles in the fiber forming process in the monofilament knotting process, the broken ends of the monofilaments in the hot stretching in the subsequent process are well avoided, and the monofilament production rate is improved.
2. The PTFE blank is extruded in a plurality of stages through a plunger pushing stroke, the uniformity of the filament discharging speed is taken as a constant, the pressure and the speed are taken as variables, so that the uniformity of the mass density of the extruded monofilament is ensured, the linear density deviation of the monofilament is reduced, and meanwhile, the production rate of the later-stage stretching of the monofilament can also be reduced.
3. Carry out automatic control through the PLC module, avoided artifical manual operation's error, alleviate workman intensity of labour, when guaranteeing product quality stability, can effectively practice thrift the labour cost.
Detailed Description
In the embodiment of the invention, the stroke sectional type hydraulic plunger wire extruding method comprises the following steps:
s1, dividing the pushing stroke of the plunger extrusion device into a plurality of stages according to the length of the pre-pressed PTFE blank, and then sending the PTFE blank into a plunger cavity of the plunger extrusion device, wherein the plunger extrusion device uses a hydraulic system as pushing power, and the pushing mode adopts the pushing of the plunger in the cavity;
s2, presetting parameters of plunger pressure and pushing speed of each stroke stage according to design values, and adopting a PLC module to program and control the initial plunger pressure for pushing to be 5-8 Mpa and the corresponding pushing speed to be 50-70 mm/min; the pressure of the tail end plunger is 13-15 Mpa, and the corresponding pushing speed is 80-100 mm/min;
s3, extruding and forming the PTFE raw filament by plunger type pushing to obtain the polytetrafluoroethylene raw filament with the filament outlet speed controlled at 30-80 mm/min, the extrusion linear diameter controlled at 0.55-2.2 mm and the linear density controlled at 1000-5000 tex, and deoiling, sintering and hot stretching the extruded polytetrafluoroethylene raw filament to obtain the formed polytetrafluoroethylene monofilament with the monofilament breakage rate less than 10%.
Preferably, different pressures and speeds are set for the PTFE billet in different extrusion stages, the ratio of the pressure to the speed is gradually decreased, and the parameter values of the pressures and the speeds are preset according to the gradient principle of increasing the pressure and decreasing the speed so as to keep the filament discharging speed stable and the density of the filaments uniform.
Preferably, the hydraulic system is composed of a servo motor, an oil pump, a pressure sensor, an oil tank and a servo controller, the volume of the oil tank is 50-100L, the oil pump is a 3-8 cc internal gear pump, the measuring range of the pressure sensor is 0-25 MPa, the servo motor is a 2.5-5 KW alternating current servo motor, and the hydraulic pushing pressure is 5-5 MPa.
Preferably, the control mode of the plunger pressing stroke may adopt two modes of equal-amount segmentation and unequal-amount segmentation, wherein the equal-amount segmentation is L/N, and the unequal-amount segmentation is L1 and L2 … … Ln.
Preferably, the plunger pushing in the cavity can adopt vertical cavity pushing or horizontal cavity pushing.
Preferably, the inner diameter of a cavity of the plunger extrusion device is 10-50 mm, and the depth of the cavity is 200-600 mm; the diameter of the plunger is 9.9-49.9 mm; the caliber of the spinning nozzle is 0.5-2 mm, and the included angle of the cone flow guide of the combined part of the spinning nozzle and the cavity is 30-60 degrees.
Preferably, the PTFE blank is a paste prepared by mixing polytetrafluoroethylene fiber fraction dispersion resin and light white oilExtruding the mixture into a blank through a die, wherein the length of the PTFE blank is 190-590 mm, and the density of the polytetrafluoroethylene fiber-grade dispersion resin is 2.18-2.19 g/cm3The flash point of the light white oil is 70-100 ℃.
To better illustrate the technical effects of the present invention, the following examples are given:
s11: the plunger extrusion device is a hydraulic plunger filament extruding machine with a vertical pushing structure, wherein the plunger extrusion device is a hydraulic power circulation system consisting of a cavity with the inner diameter of 35mm, the length of 62cm, the diameter of 35mm, the effective stroke of a plunger of 600cm, the diameter of a filament outlet of 1.2mm and a diversion centrum included angle of 45 degrees, and a hydraulic system is a 2.5kw alternating-current servo motor, an internal gear pump and a pressure sensor;
s12: the domestic 203-brand dispersing resin with the density of 2.18 is preferred; the domestic light white oil D80 of a certain brand is used as an extrusion aid, the two are mixed according to the proportion of 100:15, and the mixture is stored in a heat preservation box at 50 ℃ for 3-7 days;
s13: the paste obtained by mixing the resin obtained in the step S12 with the extrusion aid is placed in a circular mold with a diameter of 34.5mm and mechanically pressed to form a preform with a diameter of 34.8mm and a length of 60 mm;
s14: and (3) putting the blank prepared in the step S13 into a wire extrusion cavity, keeping the self-heat of the cavity at 50-70 ℃, after the plunger rod is pushed and reset, presetting the stroke to 6 sections through a PLC (programmable logic controller) module, and setting corresponding pressure and speed parameters as shown in the following table 1:
TABLE 1
| Position of | Electronic scale | Interval(s) | Preset pressure (Bar) | Speed preset (mm/min) |
| H0 | 0000mm | |||
| H1 | 0200mm | H0-H1 | 65 | 100 |
| H2 | 0300mm | H1-H2 | 85 | 90 |
| H3 | 0380mm | H2-H3 | 90 | 85 |
| H4 | 0450mm | H3-H4 | 95 | 80 |
| H5 | 0510mm | H4-H5 | 100 | 75 |
| H6 | 0560mm | H5-H6 | 105 | 70 |
S15: after all data are preset in the step S14, the PLC module enters into a self-control mode and is started, the spinning speed of a spinning outlet is 60-80 mm/min, and the diameter of raw silk is 1.3-1.4 mm; the raw silk thread density was measured 16000D.
The 16000D polytetrafluoroethylene raw silk prepared by the steps can be processed by procedures of oil removal, sintering, drafting and the like to prepare 300-800D semitransparent polytetrafluoroethylene stretched raw silk; the section of the material is circular, the breaking strength is more than 3cN/den, the linear density deviation is less than 5%, and the breaking elongation is 4-8%; the monofilament is further twisted, re-drawn, set and other treated to produce PTFE sewing thread, which is superior to PTFE filament, and has the features of plump thread diameter, wear resistance, homogeneous linear density, dry, smooth and stiff thread, easy weaving, etc.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention are equivalent to or changed within the technical scope of the present invention.
Claims (7)
1. A stroke sectional type hydraulic plunger wire extruding method is characterized by comprising the following steps:
s1, dividing the pushing stroke of the plunger extrusion device into a plurality of stages according to the length of the pre-pressed PTFE blank, and then sending the PTFE blank into a plunger cavity of the plunger extrusion device, wherein the plunger extrusion device uses a hydraulic system as pushing power, and the pushing mode adopts the pushing of the plunger in the cavity;
s2, presetting parameters of plunger pressure and pushing speed of each stroke stage according to design values, and adopting a PLC module to program and control, wherein the initial plunger pressure for pushing is 5-8 Mpa, and the corresponding pushing speed is 50-70 mm/min; the pressure of the tail end plunger is 13-15 Mpa, and the corresponding pushing speed is 80-100 mm/min;
s3, extruding and forming the PTFE raw filament by plunger type pushing to obtain the polytetrafluoroethylene raw filament with the filament outlet speed controlled at 30-80 mm/min, the extrusion linear diameter controlled at 0.55-2.2 mm and the linear density controlled at 1000-5000 tex, and deoiling, sintering and hot stretching the extruded polytetrafluoroethylene raw filament to obtain the formed polytetrafluoroethylene monofilament with the monofilament breakage rate less than 10%.
2. The stroke-segmented hydraulic plunger thread extrusion method as claimed in claim 1, wherein the PTFE billet is set with different pressures and speeds in different extrusion stages, the ratio of the pressure to the speed is gradually decreased, and the parameter values of the pressures and the speeds are preset according to the gradual change principle of the pressure increase and the speed decrease so as to keep the thread output speed stable and the density of the knotted threads uniform.
3. The stroke-segmented hydraulic plunger wire extrusion method as claimed in claim 1, wherein the hydraulic system is composed of a servo motor, an oil pump, a pressure sensor, an oil tank and a servo controller, the oil tank has a volume of 50-100L, the oil pump is a 3-8 cc internal gear pump, the pressure sensor has a measurement range of 0-25 MPa, the servo motor is a 2.5-5 KW alternating current servo motor, and the hydraulic pushing pressure is 5-5 MPa.
4. The stroke-segmented hydraulic ram threading method of claim 1 wherein the control mode of the ram pressing stroke can be two modes of equal-segment and unequal-segment, wherein the equal-segment is L/N and the unequal-segment is L1, L2 … … Ln.
5. The stroke-segmented hydraulic plunger threading method according to claim 1, wherein the plunger pushing in the cavity can adopt cavity vertical pushing or cavity horizontal parallel pushing.
6. The stroke-segmented hydraulic plunger wire extrusion method as claimed in claim 1, wherein the inner diameter of the cavity of the plunger extrusion device is 10-50 mm, and the depth is 200-600 mm; the diameter of the plunger is 9.9-49.9 mm; the caliber of the spinning nozzle is 0.5-2 mm, and the included angle of the cone flow guide of the combined part of the spinning nozzle and the cavity is 30-60 degrees.
7. The stroke-segmented hydraulic plunger wire extrusion method as claimed in claim 1, wherein the PTFE blank is a paste prepared by mixing polytetrafluoroethylene fiber-grade dispersion resin and light white oil, and is extruded into a blank through a die, and the length of the PTFE blank is 190-590 mm, wherein the density of the polytetrafluoroethylene fiber-grade dispersion resin is 2.18-2.19 g/cm3The flash point of the light white oil is 70-100 ℃.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1015352A (en) * | 1960-12-19 | 1965-12-31 | Federico Scurati | Ram extrusion machines |
| US4350653A (en) * | 1981-01-23 | 1982-09-21 | The Dow Chemical Company | Method for the extrusion of tetrafluoroethylene polymer tubes |
| JPH05301267A (en) * | 1992-04-27 | 1993-11-16 | Asahi Glass Co Ltd | Continuous extrusion molding of polytetrafluoroethylene |
| US5562987A (en) * | 1994-05-31 | 1996-10-08 | Hitachi Cable, Ltd. | High strength fiber of polytetrafluoroethylene and a method for manufacturing the same |
| JPH11241218A (en) * | 1998-02-24 | 1999-09-07 | Hitachi Cable Ltd | Production of high strength polytetrafluoroethylene resin fiber |
| CN103213270A (en) * | 2013-04-09 | 2013-07-24 | 天津市天塑科技集团有限公司技术中心 | Automatic production method of polytetrafluoroethylene (PTFE) dispersion resin |
| CN104589562A (en) * | 2014-11-26 | 2015-05-06 | 广东新志密封技术有限公司 | Polytetrafluoroethylene thick product automatic molding method and device |
-
2021
- 2021-09-09 CN CN202111054621.4A patent/CN113957550B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1015352A (en) * | 1960-12-19 | 1965-12-31 | Federico Scurati | Ram extrusion machines |
| US4350653A (en) * | 1981-01-23 | 1982-09-21 | The Dow Chemical Company | Method for the extrusion of tetrafluoroethylene polymer tubes |
| JPH05301267A (en) * | 1992-04-27 | 1993-11-16 | Asahi Glass Co Ltd | Continuous extrusion molding of polytetrafluoroethylene |
| US5562987A (en) * | 1994-05-31 | 1996-10-08 | Hitachi Cable, Ltd. | High strength fiber of polytetrafluoroethylene and a method for manufacturing the same |
| JPH11241218A (en) * | 1998-02-24 | 1999-09-07 | Hitachi Cable Ltd | Production of high strength polytetrafluoroethylene resin fiber |
| CN103213270A (en) * | 2013-04-09 | 2013-07-24 | 天津市天塑科技集团有限公司技术中心 | Automatic production method of polytetrafluoroethylene (PTFE) dispersion resin |
| CN104589562A (en) * | 2014-11-26 | 2015-05-06 | 广东新志密封技术有限公司 | Polytetrafluoroethylene thick product automatic molding method and device |
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