CN104015372B - The production technique of expanded polytetrafluoroethylplate plate and making equipment thereof - Google Patents

Abstract

The present invention discloses production technique and the making equipment thereof of a kind of expanded polytetrafluoroethylplate plate, its drip irrigation device is, first the polytetrafluoroethyldispersion dispersion resin of refrigeration is sieved, add auxiliary agent in proportion, mixing raw material carries out maturation, make blank, extrude and make bar, sheet film is made through double-roller calendering, degreaser drying stretches, then carries out longitudinal stretching and cross directional stretch, and the sheet film after two-way stretch passes through superimposion, and it being pressed into sheet material, final trimming completes the making of sheet material. The present invention obtains expanded polytetrafluoroethylplate plate, it it is the important breakthrough to original board making technique, key solves the problem of general sheet material creep and cold flow, the functions such as its incompressible degree, creep relaxation rate, rate of compression and rebound resilience are all significantly improved, the sealing such as aerospace, medical, food, petroleum pipe line can be widely used in, also there is fabulous use temperature in addition, ageing resistance, the performance such as nontoxic, pollution-free.

Description

The production technique of expanded polytetrafluoroethylplate plate and making equipment thereof

Technical field

The present invention relates to the production field of a kind of tetrafluoroethylene product, it is specifically related to production technique and the making equipment thereof of a kind of expanded polytetrafluoroethylplate plate.

Background technology

Tetrafluoroethylene is containing the macromolecular compound of fluorine atom in molecular backbone chain, in PTFE molecule F atom C-C key is hidden and also C-F key bond energy height stable especially, except alkali metals and fluorine element, it is not corroded by any pharmaceutical chemicals; In PTFE molecule, F atom is symmetrical, and in C-F, two kinds of element covalency combine, and does not have free electronics in molecule, and whole molecule, in neutral, makes PTFE have excellent dielectric properties; Owing to there being the fluorine-containing shell of one layer of inertia outside PTFE molecule, it is made to have outstanding non-adhesion behavior and low frictional coefficient.

Tetrafluoroethylene has outstanding excellent comprehensive performance, high temperature resistant, corrosion-resistant, sticky, self-lubricating, excellent dielectric properties, very low frictional coefficient; Adding any weighting agent that can bear PTFE sintering temperature in PTFE, its mechanical property can obtain to be improved greatly; Meanwhile, other premium properties of PTFE is kept; The kind filled has glass fibre, metal, metallization oxide compound, graphite, molybdenumdisulphide, carbon fibre, polyimide, EKONOL etc., and abrasion performance, limit PV value can improve 1000 times.

Taking tetrafluoroethylene (PTFE) as two big series products produced at present at home by the gasket seal of main raw, one is pure PTFE pad, two is modified ptfe pad, pure PTFE pad is by adopting suspension injecting tetrafluoroethylene to be raw material, mold pressing direct production and the mold pressing plate that becomes or cut out the turning plate cutting (turnery processing) and become by polyfluortetraethylene plate (rod): mold pressing plate Density inhomogeneity, flexibility is poor, turning plate density is relatively uniform, but the impact of its complete processing, material is curling type, and unfavorable ten install and use. Modified ptfe pad adds a certain proportion of functional materials in PTFE resin to improve the performance deficiency of pure PTFE, but this series products mostly is the little specification sealing element of some direct compression moldings.

Thus a kind of more excellent sealing material is sought, beyond doubt a current great technical problem, and expanded PTFE (ePTFE) this type of brand-new material just.

At medical field, expanded PTFE (ePTFE) is a kind of novel medical macromolecular materials, is made up of special working methods such as teflon resin drawns. White, high resilience and snappiness, have the reticulated structure that microfibre connects and formed, these microfibres form countless pore, and swollen body PTFE can be bent arbitrarily (crossing 360 ��), and blood compatibility is good, resistance to biological aging, for the manufacture of the medical product such as artificial blood vessel, cardiac patch. From medical angle, it is biological tissue's surrogate ideal at present, the biocompatibility good due to it and distinctive microvoid structure, nontoxic, without carcinogenic, without side effects such as sensitization, and human tissue cell and blood vessel can grow into its micropore, form tissue-welding, as autologous tissue.

In shaping field, the swollen body material being commonly called as be entirely named as expanded PTFE surgery soft-tissue patch, English name: expendedpolytetrafluoroethylene is called for short (e-PTFE) surgicalpatch. Its chemical structure is the carbon atom long-chain wrapped up by fluorine atom, due to the molecular structure that it is special, expanded PTFE is the artificial material that physico-chemical property is extremely stable, simultaneously, by reaching the clinical application of 40 years 6000000 examples, comprising the report of none routine clinical rejection after the implanting of various positions of artificial blood vessel, artificial endocranium, cardiac patch, this material of sufficient proof has good biocompatibility; Expanded PTFE becomes through special processing process by polytetrafluoroethyldispersion dispersion resin, has the ultrastructure of " knot and fiber ", can induce autologous tissue's cell ingrowth through control knot spacing; Therefore, it may also be useful to expanded PTFE as packing material and conventional material maximum be not both organization healing mode; Namely expanded PTFE is the organization healing mode that tissue is grown into, and traditional silicon rubber is then the organization healing mode of fibers encapsulation; Therefore, the Soft-tissue operation operation carrying out comprising augmentation rhinoplasty operation with this material has outward appearance nature true to nature, and prosthese is not shifted, sex change etc., the advantage of few intercurrent disease; Simultaneously cell tissue amount due to micropore of growing into is very limited again, therefore, if also can not be very difficult when needing to take out this material.

Industrially, expanded PTFE (ePTFE) adopts dispersed polytetrafluoroethylresin through special art breading, make it have many to the pure polytetrafluoroethylmaterial material of fiber and closed pore structure, its void content is between 40% one 97%, its aperture reaches 0.25��0.5 micron, not only maintain the chemical stability that tetrafluoroethylene is extremely good, extremely low coefficient of friction, wide use temperature, fabulous ageing-resistant performance, nontoxic, pollution-free premium properties such as grade, and its fine and closely woven softness, tough fiber also solves the common fault of PTFE stuffing materials--the problem of creep and cold flow, its high-density fiber is organized in after being pressed, fiber can tangle mutually, become organize tightr, evenly, airtight, waterproof, anti-leak is functional, and under the corrosive environment of harshness, also extremely good closed state is kept, solve some technical barriers that chemical industry and petroleum industry are impassable for many years in producing in the past.

But, the domestic ability producing in this block field of pure expanded polytetrafluoroethylplate plate is still very weak at present, the production technique that can produce expanded polytetrafluoroethylplate plate and the complete set production equipment also not having complete set, can not meet the demand of whole big industrial environment.

Summary of the invention

For the deficiency that prior art exists, the present invention provides production technique and the making equipment thereof of a kind of expanded polytetrafluoroethylplate plate, the production method of this complete set expanded polytetrafluoroethylplate plate and a whole set of production line equipment can be complete and produce high performance expanded polytetrafluoroethylplate plate efficiently, filled up the domestic blank producing in expanded polytetrafluoroethylplate plate technology.

For achieving the above object, the present invention provides following technical scheme:

A making method for expanded polytetrafluoroethylplate plate, it comprises following making step:

1) first being refrigerated by polytetrafluoroethyldispersion dispersion resin, the temperature of refrigeration is less than 18 DEG C, and the time of refrigeration is more than 12 hours, then sieves;

2) in the polytetrafluoroethyldispersion dispersion resin sieved, inject a certain proportion of auxiliary agent and carry out spice; Wherein the ratio of weight and number example of polytetrafluoroethyldispersion dispersion resin and auxiliary agent is: polytetrafluoroethyldispersion dispersion resin is 70��80, and auxiliary agent is 20��30;

3) mixing raw material through spice being carried out maturation, maturation temperature is 45 DEG C��75 DEG C, and the time of maturation is 12��72 hours;

4) mixing raw material after maturation being pressed into tubular blank, and tubular blank is carried out maturation, the maturation time is 5��10 hours;

5) the tubular blank after maturation is extruded into cylindrical bar;

6) cylindrical bar is rolled into sheet film;

7) by sheet film degreasing, drying, and being drawn into work in-process, temperature controls between 200 DEG C��280 DEG C;

8) work in-process sheet film being carried out longitudinal stretching, draft temperature controls between 200 DEG C��280 DEG C;

9) sheet film after longitudinal stretching carries out cross directional stretch;

10) multi-disc stretch after sheet film to carry out superimposion shaping;

11) trimming.

Described 4) pressing pressure of blank is 2.5��5MPa in step, pressurize 1��5 minute again after blank is shaping;

Described 5) extrusion pressure of cylindrical bar is 5��7MPa in step, its compression ratio is 100��150, and temperature controls at 45��75 DEG C;

Described 7) draw speed of sheet film is 10��12m/min in step, stretching ratio is 1.1��1.2 times.

Described 8) feeding speed when work in-process sheet film carries out longitudinal stretching in step is 1.5��2m/min, material recovering speed is 8��16m/min, and stretching ratio is 5��8 times.

Described 9) cross directional stretch is divided into preheating section, expansion segment and sizing section in step, wherein the temperature of preheating section is between 120��150 DEG C, the temperature of expansion segment is between 200��250 DEG C, the temperature of sizing section is between 300��380 DEG C, cross directional stretch speed is 12m/min��20m/min, and cross directional stretch multiplying power is identical with longitudinal stretching multiplying power.

Described 10) in step multi-disc stretch after sheet film first carry out superimposion; Again through preheating section preheating, preheating temperature is 200 DEG C��250 DEG C, and warm up time is 3��5 minutes; Then through exhaust section, exhaust temperature is 350 DEG C��380 DEG C, and the time is 15��25 minutes; And then it is cooled to 80 DEG C��100 DEG C at cooling section; Finally moving to sizing section sizing, temperature is 80 DEG C��100 DEG C, suppresses 1��2 minute.

Implement a making equipment for the making method of above expanded polytetrafluoroethylplate plate, comprise automatic spice machine, maturation case, blank machine, bar forcing machine, rolling press, degreaser drying stretcher, longitudinal stretching equipment, transverse stretching equipment, superimposion equipment and bead cutter respectively.

Described automatic spice machine comprises spice frame, spice bucket and gas-liquid flusher;

Being symmetrically arranged with deflector roll on described spice bucket, spice bucket is rotatably set up in spice frame by deflector roll,

Described spice frame is provided with motor, is connected with transmission rig between motor and deflector roll,

Described gas-liquid flusher includes the gauging tank that the nozzle being located in spice bucket is connected with nozzle, and described gauging tank is connected to auxiliary agent hold-up vessel and pump,

Described nozzle is connected with described pump;

The barrel that described blank machine comprises anchor, is located on anchor, the cavity volume accommodating for blank it is formed with in barrel, it is corresponding in barrel that blank both sides are movable is provided with briquetting, barrel two ends are respectively equipped with cylinder body, cylinder body is connected with the push rod that can promote briquetting, push rod is provided with magnet ring, and anchor is provided with the magnetic inductor that can coordinate with magnet ring;

Described bar forcing machine comprises forcing machine frame, be located in forcing machine frame insulated tank, the extruded tube being located in insulated tank, be provided with insulation oil in insulated tank,

Extruded tube corresponding ground side is provided with taper guiding mouth and mouth mould, and bar forcing machine also comprises the rotating disk that corresponding mouth mould is arranged,

In described extruded tube, another side of corresponding mouth mould is movable is provided with briquetting, and another side of the corresponding mouth mould of extruded tube is provided with cylinder body, and cylinder body is connected with the push rod that can promote briquetting;

Calendering discharging device, calendering roll shaft and calendering material collecting device that described rolling press comprises support, is set up on support, calendering roll shaft correspondence calendering discharging device position is provided with guide plate;

Described degreaser drying stretcher comprises degreasing discharge mechanism, degreasing baking oven, buffering dryer part, drawing oven and degreasing receiving mechanism, degreasing discharge mechanism, degreasing baking oven, buffering dryer part, drawing oven and degreasing receiving mechanism have included some roll shafts, and described degreasing baking oven is circumscribed with auxiliary agent retrieving arrangement.

Described longitudinal stretching equipment comprises longitudinal feeding mechanism, heated oven, buffering cooling body and longitudinal receiving mechanism, longitudinal feeding mechanism, buffering cooling body and longitudinal receiving mechanism have included some roll shafts, described heated oven comprises casing, be located in casing heating system and be set up in casing biconical curve roller, described biconical curve roller comprises roller and is symmetrically set in the roll shaft of roller both sides, and described roller is ellipsoid shape.

Described transverse stretching equipment comprises insulation casing, is divided into the horizontal feeding mechanism of insulation casing both sides and horizontal receiving mechanism, is provided with heating system and chain drive in described insulation casing;

Described chain drive is evenly equipped with the fixture that can clamp sheet film, described insulation casing corresponding horizontal feeding mechanism side be provided with can close fixture close clamp mechanism, the corresponding horizontal receiving mechanism side of insulation casing be provided with can opened clamping apparatus open clamp mechanism;

Described insulation casing comprises mutually heat insulation successively preheating section, expansion segment and sizing section, and described chain drive comprises the conveyer chain being symmetrically set in insulation casing,

In described preheating section, conveyer chain is set in parallel;

In described expansion segment, the spacing between conveyer chain is expanded to sizing section side gradually from preheating section side;

In described sizing section, the spacing between conveyer chain is drawn in horizontal receiving mechanism side gradually from expansion segment side.

Described superimposion equipment comprises worktable, movable fixture, the stone section being located on worktable respectively, exhaust profiled section and the sizing section being located on worktable;

Described stone section includes unreeling structure, the reciprocal laying mechanism can being laid on by sheet film continuously on fixture;

Described exhaust profiled section includes casing, be located in casing heating unit and the exhaust roll shaft that sheet film can be extruded;

Described sizing section includes can suppress and the pressing plate of expanded polytetrafluoroethylplate plate of shaping.

The a complete set of producing and manufacturing technique of this invention and production unit are designed voluntarily by our company, research and develop and installation and debugging, at present can be complete and produce pure expanded polytetrafluoroethylplate plate efficiently, and obtained expanded polytetrafluoroethylplate plate all reaches domestically leading standard in the every index of tensile strength, elongation at break, rate of compression, rebound degree, sealing leak rate etc., even catches up with and surpasses foreign standard; Expanded polytetrafluoroethylplate plate obtained in addition has self exclusive creep resistance and anti-cold flow characteristic, it is easy to cutting, it is convenient to install, the characteristic of long service life makes it can obtain practical application in nearly all sealing occasion, except few chemical substance, it can not react with other chemical substances, is thus applicable to any chemical seal occasion, and sealings all below 600 (315 DEG C) temperature needs all can be met.

Accompanying drawing explanation

Fig. 1 is the structural representation of the automatic spice machine of the present invention;

Fig. 2 is the structural representation of blank machine of the present invention;

Fig. 3 is the structural representation of bar forcing machine of the present invention;

Fig. 4 is the structural representation of rolling press of the present invention;

Fig. 5 is the structural representation of degreaser drying stretcher of the present invention;

Fig. 6 is the structural representation of longitudinal stretching equipment of the present invention;

Fig. 7 is the structural representation of transverse stretching equipment of the present invention;

Fig. 8 is the structural representation of superimposion equipment of the present invention;

Fig. 9 is the schematic flow sheet of the production technique of expanded polytetrafluoroethylplate plate of the present invention.

Reference numeral: 1, automatic spice machine; 11, spice frame; 111, transmission rig; 112, motor; 12, spice bucket; 121, deflector roll; 122, import and export; 13, gas-liquid flusher; 131, nozzle; 132, gauging tank; 133, auxiliary agent hold-up vessel; 134, pump; 135, conduit; 136, check valve; 2, blank machine; 21, anchor; 22, barrel; 23, briquetting; 24, cylinder body; 25, push rod; 26, magnet ring; 27, magnetic inductor; 3, bar forcing machine; 31, forcing machine frame; 32, insulated tank; 33, extruded tube; 34, taper guiding mouth; 35, mouth mould; 36, rotating disk; 37, briquetting; 38, push rod; 39, cylinder body; 4, rolling press; 41, support; 42, discharging device is rolled; 43, roll shaft is rolled; 44, guide plate; 45, material collecting device is rolled; 5, degreaser drying stretcher; 51, degreasing discharge mechanism; 52, degreasing baking oven; 53, dryer part is cushioned; 531, blower fan; 54, drawing oven; 55, degreasing receiving mechanism; 56, auxiliary agent retrieving arrangement; 57, heating unit; 6, longitudinal stretching equipment; 61, longitudinal feeding mechanism; 62, heated oven; 621, heating system; 622, biconical curve roller; 63, cooling body is cushioned; 64, longitudinal receiving mechanism; 7, transverse stretching equipment; 71, it is incubated casing; 72, horizontal feeding mechanism; 73, horizontal receiving mechanism; 74, chain drive; 741, conveyer chain; 75, fixture; 76, clamp mechanism is closed; 77, clamp mechanism is opened; 78, width adjustment device; 8, superimposion equipment; 81, worktable; 811, guide rail; 82, fixture; 83, unreeling structure; 84, mechanism is back and forth laid; 85, it is vented roll shaft; 86, pressing plate; 87, cylinder; 871, roll shaft is suppressed; 88, counter; 89, hydraulic stem.

Embodiment

Referring to figs. 1 through Fig. 9, the production technique of expanded polytetrafluoroethylplate plate of the present invention and making equipment embodiment thereof are described further.

A making method for expanded polytetrafluoroethylplate plate, it comprises following making step:

1) first being refrigerated by polytetrafluoroethyldispersion dispersion resin, the temperature of refrigeration is less than 18 DEG C, and the time of refrigeration is more than 12 hours, then sieves;

2) in the polytetrafluoroethyldispersion dispersion resin sieved, inject a certain proportion of auxiliary agent and carry out spice; Wherein the ratio of weight and number example of polytetrafluoroethyldispersion dispersion resin and auxiliary agent is: polytetrafluoroethyldispersion dispersion resin is 70��80, and auxiliary agent is 20��30;

3) mixing raw material through spice being carried out maturation, maturation temperature is 45 DEG C��75 DEG C, and the time of maturation is 12��72 hours;

4) mixing raw material after maturation being pressed into tubular blank, and tubular blank is carried out maturation, the maturation time is 5��10 hours;

5) the tubular blank after maturation is extruded into cylindrical bar;

6) cylindrical bar is rolled into sheet film;

7) by sheet film degreasing, drying, and being drawn into work in-process, temperature controls between 200 DEG C��280 DEG C;

8) work in-process sheet film being carried out longitudinal stretching, draft temperature controls between 200 DEG C��280 DEG C;

9) sheet film after longitudinal stretching carries out cross directional stretch;

10) multi-disc stretch after sheet film to carry out superimposion shaping;

11) trimming.

Described 4) pressing pressure of blank is 2.5��5MPa in step, pressurize 1��5 minute again after blank is shaping;

Described 5) extrusion pressure of cylindrical bar is 5��7MPa in step, its compression ratio is 100��150, and temperature controls at 45��75 DEG C;

Described 7) draw speed of sheet film is 10��12m/min in step, stretching ratio is 1.1��1.2 times.

Described 8) feeding speed when work in-process sheet film carries out longitudinal stretching in step is 1.5��2m/min, material recovering speed is 8��16m/min, and stretching ratio is 5��8 times.

Described 9) cross directional stretch is divided into preheating section, expansion segment and sizing section in step, wherein the temperature of preheating section is between 120��150 DEG C, the temperature of expansion segment is between 200��250 DEG C, the temperature of sizing section is between 300��380 DEG C, cross directional stretch speed is 12m/min��20m/min, and cross directional stretch multiplying power is identical with longitudinal stretching multiplying power.

Described 10) in step multi-disc stretch after sheet film first carry out superimposion; Again through preheating section preheating, preheating temperature is 200 DEG C��250 DEG C, and warm up time is 3��5 minutes; Then through exhaust section, exhaust temperature is 350 DEG C��380 DEG C, and the time is 15��25 minutes; And then it is cooled to 80 DEG C��100 DEG C at cooling section; Finally moving to sizing section sizing, temperature is 80 DEG C��100 DEG C, suppresses 1��2 minute.

Implement a making equipment for the making method of above expanded polytetrafluoroethylplate plate, comprise automatic spice machine 1, maturation case, blank machine 2, bar forcing machine 3, rolling press 4, degreaser drying stretcher 5, longitudinal stretching equipment 6, transverse stretching equipment 7, superimposion equipment 8 and bead cutter respectively.

Described automatic spice machine comprises spice frame 11, spice bucket 12 and gas-liquid flusher 13;

Being symmetrically arranged with deflector roll 121 on described spice bucket 12, spice bucket 12 is rotatably set up in spice frame 11 by deflector roll 121,

Described spice frame 11 is provided with motor 112, is connected with transmission rig 111 between motor 112 and deflector roll 121,

Described gas-liquid flusher 13 includes the gauging tank 132 that the nozzle 131 being located in spice bucket 12 is connected with nozzle 131, and described gauging tank 132 is connected to auxiliary agent hold-up vessel 133 and pump 134,

Described nozzle 131 is connected with described pump 134;

The barrel 22 that described blank machine 2 comprises anchor 21, is located on anchor 21, the cavity volume accommodating for blank it is formed with in barrel 22, it is corresponding in barrel 22 that blank both sides are movable is provided with briquetting 23, barrel 22 two ends are respectively equipped with cylinder body 24, cylinder body 24 is connected with the push rod 25 that can promote briquetting 23, push rod 25 is provided with magnet ring 26, and anchor 21 is provided with the magnetic inductor 27 that can coordinate with magnet ring 26;

Described bar forcing machine 3 comprises forcing machine frame 31, be located in forcing machine frame 31 insulated tank 32, the extruded tube 33 being located in insulated tank 32, be provided with insulation oil in insulated tank 32,

Extruded tube 33 corresponding ground side is provided with taper guiding mouth 34 and mouth mould 35, and bar forcing machine 3 also comprises the rotating disk 36 that corresponding mouth mould 35 is arranged,

In described extruded tube 33, another side of corresponding mouth mould 35 is movable is provided with briquetting 37, and another side of the corresponding mouthful mould 35 of extruded tube 33 is provided with cylinder body 39, and cylinder body 39 is connected with the push rod 38 that can promote briquetting 37;

Calendering discharging device 42, calendering roll shaft 43 and calendering material collecting device 45 that described rolling press 4 comprises support 41, is set up on support 41, calendering roll shaft 43 correspondence calendering discharging device 42 position is provided with guide plate 44;

Described degreaser drying stretcher 5 comprises degreasing discharge mechanism 51, degreasing baking oven 52, buffering dryer part 53, drawing oven 54 and degreasing receiving mechanism 55, degreasing discharge mechanism 51, degreasing baking oven 52, buffering dryer part 53, drawing oven 54 and degreasing receiving mechanism 55 have included some roll shafts, and described degreasing baking oven 52 is circumscribed with auxiliary agent retrieving arrangement 56.

Described longitudinal stretching equipment 6 comprises longitudinal feeding mechanism 61, heated oven 62, buffering cooling body 63 and longitudinal receiving mechanism 64, longitudinal feeding mechanism 61, buffering cooling body 63 and longitudinal receiving mechanism 64 have included some roll shafts, described heated oven 62 comprises casing, be located in casing heating system 621 and be set up in casing biconical curve roller 622, described biconical curve roller 622 comprises roller and is symmetrically set in the roll shaft of roller both sides, and described roller is ellipsoid shape.

Described transverse stretching equipment 7 comprises insulation casing 71, is divided into the horizontal feeding mechanism 72 of insulation casing 71 both sides and horizontal receiving mechanism 73, is provided with heating system and chain drive 74 in described insulation casing 71;

Described chain drive 74 is evenly equipped with the fixture 75 that can clamp sheet film, described insulation casing 71 corresponding horizontal feeding mechanism 72 side be provided with can close fixture 75 close clamp mechanism 76, corresponding horizontal receiving mechanism 73 side of insulation casing 71 be provided with can opened clamping apparatus 75 open clamp mechanism 77;

Described insulation casing 71 comprises mutually heat insulation successively preheating section, expansion segment and sizing section, and described chain drive 74 comprises the conveyer chain 741 being symmetrically set in insulation casing 71,

In described preheating section, conveyer chain 741 is set in parallel;

In described expansion segment, the spacing between conveyer chain 741 is expanded to sizing section side gradually from preheating section side;

In described sizing section, the spacing between conveyer chain 741 is drawn in horizontal receiving mechanism 73 side gradually from expansion segment side.

Described superimposion equipment 8 comprises worktable 81, movable fixture 82, the stone section being located on worktable 81 respectively, exhaust profiled section and the sizing section being located on worktable 81;

Described stone section includes unreeling structure 83, the reciprocal laying mechanism 84 can being laid on by sheet film continuously on fixture 82;

Described exhaust profiled section includes casing, be located in casing heating unit and the exhaust roll shaft 85 that sheet film can be extruded;

Described sizing section includes can suppress and the pressing plate 86 of expanded polytetrafluoroethylplate plate of shaping.

Embodiment:

1) first put polytetrafluoroethyldispersion dispersion resin into refrigerating chamber to refrigerate, as preferably, the temperature of refrigeration is less than 18 DEG C, and the time of refrigeration is more than 12 hours, then sieves, herein it is noted that screening must carry out at that same temperature;

2) polytetrafluoroethyldispersion dispersion resin sieved is weighed, pour in automatic spice machine 1, automatic spice machine 1 comprises spice frame 11, spice bucket 12 and gas-liquid flusher 13, spice bucket 12 is rotatably set up in spice frame 11 by deflector roll 121, as preferably, spice bucket 12 is arranged in biconical, and be made up of stainless steel cylinder, spice bucket 12 has been offered import and export 122, the polytetrafluoroethyldispersion dispersion resin sieved is poured in spice bucket 12 from import and export 122, in auxiliary agent hold-up vessel 133, inject a certain proportion of auxiliary agent again (it should be noted that herein, this auxiliary agent can be kerosene, ether, solvent oil, sherwood oil, or the one or more than one mixing in paraffin oil), wherein the ratio of weight and number example of polytetrafluoroethyldispersion dispersion resin and auxiliary agent is: polytetrafluoroethyldispersion dispersion resin is 70��80, auxiliary agent is 20��30, now can carry out spice, spice bucket 12 rotates under the driving of motor 112 and transmission rig 111, its rotating speed rotated is 5��10 revs/min, now, auxiliary agent in auxiliary agent hold-up vessel 133 flows in gauging tank 132, as preferably, auxiliary agent hold-up vessel 133 is positioned at the top of gauging tank 132, auxiliary agent flows in gauging tank 132 under gravity automatically, and auxiliary agent is pushed to nozzle 131 place by gauging tank 132 under the pressure of pump 134 promotes, meanwhile, pump 134 is directly connected with nozzle 131, gas is sprayed from nozzle 131, auxiliary agent is directly sprayed onto polytetrafluoroethyldispersion dispersion resin surface with mist, make the blended absorbent more uniform and complete of its feed particles and auxiliary agent, you need to add is that, pump 134, gauging tank 132, connection between auxiliary agent hold-up vessel 133 and nozzle 131 is all realized by conduit 135, and conduit 135 can be arranged in the deflector roll 121 on spice bucket 12, as preferably, between auxiliary agent hold-up vessel 133 and gauging tank 132, between gauging tank 132 and nozzle 131, between pump 134 and gauging tank 132, check valve 136 it is equipped with between pump 134 and nozzle 131, the control to whole flow process can be realized.

3) pour in special insulated tank stirring after the mixing raw material after evenly is weighed, and it is positioned in maturation case and carries out maturation, as preferably, maturation temperature is 45 DEG C��75 DEG C, and the time of maturation is 12��72 hours.

4) mixing raw material of polytetrafluoroethyldispersion dispersion resin after maturation and auxiliary agent makes tubular blank, as preferably, blank machine 2 adopts two-way hydraulic cylinder to drive push rod 25 to promote briquetting 23, and is suppressed the tubular blank of equal altitudes, isodensity by magneticinduction control, and its specific operation process is as follows:

A certain amount of mixing raw material is poured in the cavity volume of barrel 22, as preferably, by cylinder body 24, namely the pressure adjusting of hydro-cylinder is to 2.5��5MPa, being positioned at the cylinder body 24 above barrel 22 promotes push rod 25 to walk to briquetting 23 place fast and transfer propelling movement briquetting 23 at a slow speed to, stop when magnet ring 26 moves to magnetic inductor 27 setting height, and then it is positioned at the cylinder body 24 below barrel 22 and promotes push rod 25, briquetting 23 is pushed at a slow speed, stop when magnet ring 26 moves to magnetic inductor 27 setting height, now blank compression moulding, as preferably, keep pressure again 1��5 minute, base completes (to it should be noted that herein, as the best preferred version of the present invention, the surrounding of barrel 22 is distributed with the venting hole of some amount, when blank is suppressed, by the air in the abundant emptying particulate state of venting hole or powdery mixing raw material, ensure the density uniformity of blank), now it is positioned at the cylinder body 24 go back tos positions above barrel 22, it is positioned at the cylinder body 24 below barrel 22 and blank is ejected cavity volume, finally blank is put into maturation case and carries out maturation, as preferably, the maturation time is 5��10 hours.

5) blank after maturation is pushed away in extruded tube 33, it is extruded into the cylindrical bar of certain diameter, and cylindrical bar rolling on rotating disk 36, as preferably, extrusion pressure is 5��7MPa, extrusion temperature is 45��75 DEG C, employing turning oil heats, making extruded tube 33 barrel temperature more even, make cylindrical bar soft durometer, density and the uniformity coefficient conformance with standard more extruded, its specific operation process is as follows:

Extruded tube 33 is positioned at insulated tank 32, heated oil is filled in insulated tank 32, as preferably, adopt external turning oil heating system that the heated oil in insulated tank 32 is carried out constant temperature, blank after maturation is pushed away in extruded tube 33, open cylinder body 39, as preferably selecting liquid pump as power, and it is adjusted to predetermined pressure, cylinder body 39 promotes push rod 38 to move to briquetting 37 place fast, and be converted to and push at a slow speed briquetting 37, until going back to position after being all extruded by the blank in extruded tube 33, cylindrical bar while extruding by rolling in rotating disk 36, you need to add is that herein, extruded tube 33 corresponding ground side is provided with taper guiding mouth 34 and mouth mould 35, wherein as preferred, the tapering of bevel angle is 15��20 degree, and the compression ratio of cylindrical bar is 100��150.

6) the cylindrical bar extruded and rotating disk are removed to calendering discharging device 42 place, start calendering, first calendering roll shaft 43 is preheated to 60��80 DEG C during calendering, type of heating can be oil heating, electrically heated or steam heating etc., then cylindrical bar is pushed away in guide plate 44, as preferably, adopt two calendering roll shafts 43, the sheet film that cylindrical bar is rolled into certain thickness and width by double-roller (it should be noted that herein, the thickness of sheet film and width can be decided according to the actual requirements, range of product can be determined) according to the thickness of different size millipore filtration compacting and width, then by calendering material collecting device 45, the sheet film after calendering is carried out rolling.

7) sheet film after calendering is delivered to degreasing discharge mechanism 51 place, it is delivered in degreasing baking oven 52 by roll shaft, as preferably, heating unit 57 it is provided with in degreasing baking oven 52, the temperature in degreasing baking oven 52 is made to control between 200��280 DEG C, sheet film carries out degreasing work in this stage, it is delivered to buffering dryer part 53 by sheet film out in degreasing baking oven 52 by roll shaft to be dried, preferably, buffering dryer part 53 is also provided with blower fan 531, it is convenient to the drying of sheet film, then sheet film is transported in drawing oven 54, preferably, heating unit 57 it is provided with in drawing oven 54, the temperature in drawing oven 54 is made to control between 200��280 DEG C, sheet film is stretched under certain temperature and speed by roll shaft, as the best preferred version of the present invention, the speed that appeal stretches is 10��12m/min, stretch ratio is 1.1��1.2 times, finally by degreasing receiving mechanism 55, the sheet film after stretching is carried out rolling work, as preferably, degreasing baking oven 52 is also circumscribed with auxiliary agent retrieving arrangement 56, realize the recycling of auxiliary agent, greatly reduce production cost, protection of the environment simultaneously, decreasing pollution.

8) work in-process sheet film is delivered to place of longitudinal feeding mechanism 61, by roll shaft, work in-process sheet film is delivered in heated oven 62, as the best preferred version of the present invention, this roll shaft is biconical curve roller 622, its roller is ellipsoid shape, and in heated oven 62, it is provided with heating system 621, temperature in heated oven 62 is controlled between 200��280 DEG C, work in-process sheet film carries out longitudinal stretching by biconical curve roller 622 in heated oven 62, then the sheet film after stretching in heated oven 62 is sent on buffering cooling body 63 and cools, finally by longitudinal receiving mechanism 64, the sheet film after longitudinal stretching is carried out rolling, as the best preferred version of the present invention, feeding speed during longitudinal stretching is set to 1.5��2m/min, material recovering speed is 8��16m/min, the multiplying power stretched is 5��8 times.

9) sheet film after longitudinal stretching carries out cross directional stretch, cross directional stretch is divided into preheating section, expansion segment and sizing section, wherein the temperature of preheating section is between 120��150 DEG C, the temperature of expansion segment is between 200��250 DEG C, the temperature of sizing section is between 300��380 DEG C, and cross directional stretch speed is 12m/min��20m/min, as the best preferred version of the present invention, cross directional stretch multiplying power is identical with longitudinal stretching multiplying power, and its concrete operating process is as follows:

Chain drive 74 is evenly equipped with the fixture 75 that can clamp sheet film, chain drive 74 comprises the conveyer chain 741 being symmetrically set in insulation casing 71, namely fixture 75 is distributed on two conveyer chains 741, insulation casing 71 corresponding horizontal feeding mechanism 72 side be provided with can close fixture 75 close clamp mechanism 76, corresponding horizontal receiving mechanism 73 side of insulation casing 71 be provided with can opened clamping apparatus 75 open clamp mechanism 77, sheet film after longitudinal stretching delivers to place of horizontal feeding mechanism 72, by chain drive 74, sheet film is delivered in insulation casing 71, now sheet film is firmly clamped by the fixture 75 on chain drive 74 under the effect closing clamp mechanism 76, and in insulation casing 71, two conveyer chains 741 at preheating section place are set in parallel, sheet film preheats herein, in expansion segment, spacing between conveyer chain 741 is expanded to sizing section side gradually from preheating section side, while between conveyer chain 741, spacing is expanded, sheet film is firmly clamped by fixture 75, sheet film is laterally expanded stretching herein, due to the continuous rising of temperature, sheet film at high temperature shrinks to be gathered, in order to avoid film to rupture, therefore in sizing section, spacing between conveyer chain 741 is drawn in horizontal receiving mechanism 73 side gradually from expansion segment side, and sheet film completes cross directional stretch work in this stage, when sheet film is sent by the section of sizing, fixture 75 is opened under the effect opening clamp mechanism 77, sheet film is unclamped, sheet film is by horizontal receiving mechanism 73 rolling, as preferably, a breeze way also it is provided with between expansion segment and sizing section, it should be noted that herein, the heating system that insulation casing 71 can be carried out heated constant temperature it is provided with in insulation casing 71, and at preheating section, expansion segment, heating system and control temperature sensor it is provided with all separately in breeze way and sizing section, and the spacing of control temperature sensor and sheet film controls at 5��7cm, and in insulation casing 71, preheating section, expansion segment, breeze way and sizing section, between each section all heat insulation by casing baffle plate, it is independent of each other each other, and at preheating section in sizing section, gradual temperature in insulation casing 71 raises, make temperature from being low to moderate height, not only can not affect technical process, and realize the Appropriate application of the energy, as the preferred version of the present invention, transverse stretching equipment 7 is also provided with the width adjustment device 78 of spacing between adjustable two conveyer chains 741, the spacing adjustment carrying out between conveyer chain 741 can be needed according to practical application.

10) when stone section, sheet film after two-way stretch is placed on unreeling structure 83, as preferably, cylinder 87 and compacting roll shaft 871 also it is provided with between mechanism 84 at unreeling structure 83 and reciprocal laying, driving by cylinder 87 makes sheet film carry by certain direction and speed, and back and forth lay mechanism 84 can be can move back and forth and can the movable roll shaft of two-way clamping sheet film, in movable roll shaft commute moves, by horizontal for sheet film superimposion on fixture 82, as preferably, cylinder 87 side is provided with length counter 88, volume length is put by what length counter 88 controlled sheet film, by compacting certain thickness, the sheet material of density has set different counting steps,

As preferably, being also provided with preheating section between stone section and exhaust profiled section, after completing horizontal superimposion, multilayer chip film is fixed on fixture 82, then fixture 82 being delivered to preheating section, the temperature in preheating section casing is 200��250 DEG C, and warm up time is 3��5 minutes;

After preheating section thermal pretreatment, fixture 82 is moved to being vented profiled section, temperature in exhaust profiled section casing is 350��380 DEG C, time is 15��25 minutes, as preferably, the hydraulic stem 89 that can promote exhaust roll shaft 85 also it is provided with at exhaust profiled section, the exhaust roll shaft 85 being divided into fixture about 82 both sides is promoted by hydraulic stem 89, extrude the sheet film after superimposion simultaneously, owing to preheating section compares principle according to material pyrocondensation, every layer film is made to even up homogenizing at a certain temperature, during to exhaust profiled section, along with the rising of temperature, air between every layer film also expanded by heating thereupon, make can not fully bond between film, entirety can not be formed, it is exhausted to multilayer chip film by exhaust roll shaft 85 direct pressing on hydraulic stem 89, multilayer chip film after row's phosgene forms entirety, multilayer chip film is made fully to bond and form overall sheet material,

As preferably, being provided with cooling section between exhaust profiled section and sizing section, have the fixture 82 of sheet material to deliver to cooling section on exhaust profiled section folder out, sheet forming is cooled to 80��100 DEG C;

Finally move to the section of sizing, as preferably, the oven temperature of sizing section is 80��100 DEG C, pressing plate 86 is divided into the both sides of sheet material, and under the promotion of hydraulic stem 89 pressed sheet 1��2 minute, be pressed into the sheet material of certain thickness and density, sizing after sheet material through being cooled to normal temperature.

As the best preferred version of the present invention, the worktable 81 of superimposion equipment 8 is equipped with guide rail 811, fixture 82 is located on worktable 81 by guide rail 811 slip, and is provided with the driving chain of linkage fixture 82 on guide rail 811, it is achieved the conveying of fixture 82.

11) sheet material is pulled down from fixture also trimming, complete the making of expanded polytetrafluoroethylplate plate.

As another embodiment of the invention, while multilayer chip film carries out superimposion, can filler metal silk screen, Special Metal sheet material, glasscloth, high carbon cloth, graphite, molybdenumdisulphide, polyimide, EKONOL etc. as bed course, the mechanical property of the expanded polytetrafluoroethylplate plate obtained is much improved, other premium properties of PTFE can be kept simultaneously.

The a complete set of producing and manufacturing technique of this invention and production unit are designed voluntarily by our company, research and develop and installation and debugging, at present can be complete and produce pure expanded polytetrafluoroethylplate plate efficiently, and obtained expanded polytetrafluoroethylplate plate all reaches domestically leading standard in the every index of tensile strength, elongation at break, rate of compression, rebound degree, sealing leak rate etc., even catches up with and surpasses foreign standard; Expanded polytetrafluoroethylplate plate obtained in addition has self exclusive creep resistance and anti-cold flow characteristic, it is easy to cutting, it is convenient to install, the characteristic of long service life makes it can obtain practical application in nearly all sealing occasion, except few chemical substance, it can not react with other chemical substances, is thus applicable to any chemical seal occasion, and sealings all below 600 (315 DEG C) temperature needs all can be met.

This kind of big area, soft polyfluortetraethylene plate by mechanical stamping or are hand-maked shaping, and any cutting method, all can not have an impact to its stopping property performance, regardless of flange face shape, it may also be useful to it all can make its installation work become very easy; And by its obtained tabular pad, there is uniqueness and comply with forming ability, thus just can produce good sealing effect on coarse or impaired flange face without the need to increasing how many snap-in forces, substantially prolongs the work-ing life of flange; As the final substitute of asbestos gasket, tabular gasket seal is except whole advantages with tetrafluoroethylene, also possess self exclusive creep resistance and anti-cold flow characteristic, and these characteristics sealing prod is indispensable just, it is easy to cutting in addition, it is convenient to install, it may also be useful to the characteristic of life-span length makes it can obtain practical application in nearly all sealing occasion.

The above is only the preferred embodiment of the present invention, and protection scope of the present invention is also not only confined to above-described embodiment, and all technical schemes belonged under thinking of the present invention all belong to protection scope of the present invention. It is noted that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (4)

1. the making equipment of an expanded polytetrafluoroethylplate plate, it is characterized in that: comprise automatic spice machine, maturation case, blank machine, bar forcing machine, rolling press, degreaser drying stretcher, longitudinal stretching equipment, transverse stretching equipment, superimposion equipment and bead cutter respectively, described automatic spice machine comprises spice frame, spice bucket and gas-liquid flusher;

Being symmetrically arranged with deflector roll on described spice bucket, spice bucket is rotatably set up in spice frame by deflector roll,

Described spice frame is provided with motor, is connected with transmission rig between motor and deflector roll,

Described gas-liquid flusher includes the gauging tank that the nozzle being located in spice bucket is connected with nozzle, and described gauging tank is connected to auxiliary agent hold-up vessel and pump,

Described nozzle is connected with described pump;

The barrel that described blank machine comprises anchor, is located on anchor, the cavity volume accommodating for blank it is formed with in barrel, it is corresponding in barrel that blank both sides are movable is provided with briquetting, barrel two ends are respectively equipped with cylinder body, cylinder body is connected with the push rod that can promote briquetting, push rod is provided with magnet ring, and anchor is provided with the magnetic inductor that can coordinate with magnet ring;

Described bar forcing machine comprises forcing machine frame, be located in forcing machine frame insulated tank, the extruded tube being located in insulated tank, be provided with insulation oil in insulated tank,

Extruded tube corresponding ground side is provided with taper guiding mouth and mouth mould, and bar forcing machine also comprises the rotating disk that corresponding mouth mould is arranged,

In described extruded tube, another side of corresponding mouth mould is movable is provided with briquetting, and another side of the corresponding mouth mould of extruded tube is provided with cylinder body, and cylinder body is connected with the push rod that can promote briquetting;

Calendering discharging device, calendering roll shaft and calendering material collecting device that described rolling press comprises support, is set up on support, calendering roll shaft correspondence calendering discharging device position is provided with guide plate;

Described degreaser drying stretcher comprises degreasing discharge mechanism, degreasing baking oven, buffering dryer part, drawing oven and degreasing receiving mechanism, degreasing discharge mechanism, degreasing baking oven, buffering dryer part, drawing oven and degreasing receiving mechanism have included some roll shafts, and described degreasing baking oven is circumscribed with auxiliary agent retrieving arrangement.

2. making equipment according to claim 1, it is characterized in that: described longitudinal stretching equipment comprises longitudinal feeding mechanism, heated oven, buffering cooling body and longitudinal receiving mechanism, longitudinal feeding mechanism, buffering cooling body and longitudinal receiving mechanism have included some roll shafts, described heated oven comprises casing, be located in casing heating system and be set up in casing biconical curve roller, described biconical curve roller comprises roller and is symmetrically set in the roll shaft of roller both sides, and described roller is ellipsoid shape.

3. making equipment according to claim 1, it is characterized in that: described transverse stretching equipment comprises insulation casing, is divided into the horizontal feeding mechanism of insulation casing both sides and horizontal receiving mechanism, is provided with heating system and chain drive in described insulation casing;

Described chain drive is evenly equipped with the fixture that can clamp sheet film, described insulation casing corresponding horizontal feeding mechanism side be provided with can close fixture close clamp mechanism, the corresponding horizontal receiving mechanism side of insulation casing be provided with can opened clamping apparatus open clamp mechanism;

Described insulation casing comprises mutually heat insulation successively preheating section, expansion segment and sizing section, and described chain drive comprises the conveyer chain being symmetrically set in insulation casing,

In described preheating section, conveyer chain is set in parallel;

In described expansion segment, the spacing between conveyer chain is expanded to sizing section side gradually from preheating section side;

In described sizing section, the spacing between conveyer chain is drawn in horizontal receiving mechanism side gradually from expansion segment side.

4. making equipment according to claim 1, it is characterised in that: described superimposion equipment comprises worktable, movable fixture, the stone section being located on worktable respectively, exhaust profiled section and the sizing section being located on worktable;

Described stone section includes unreeling structure, the reciprocal laying mechanism can being laid on by sheet film continuously on fixture;

Described exhaust profiled section includes casing, be located in casing heating unit and the exhaust roll shaft that sheet film can be extruded;

Described sizing section includes can suppress and the pressing plate of expanded polytetrafluoroethylplate plate of shaping.