CN101091883A - Equipment for manufacturing composite membrane filter of polytetrafluoroethylene - Google Patents

Abstract

The invention discloses a polytetrafluoroethylene-supported composite filter membrane manufacturing equipment, which includes a feeding and winding transmission device, a pressing device and a control device. The feeding and winding transmission device includes a polytetrafluoroethylene microporous filter membrane feeding roller, The supporting material feeding roller, the composite film winding roller, the polytetrafluoroethylene microporous filter membrane feeding driving roller, the supporting material feeding driving roller and the composite film winding driving roller are characterized in that the pressing device is equipped with a rotating speed The control device consists of a heating composite roller and a cooling composite roller, at least one of the shafts of the heating composite roller and the cooling composite roller is provided with a pressing pressure transmission device, the heating composite roller is provided with a heating device, and the cooling composite roller is equipped with a heating device. The rollers are provided with cooling devices, and are equipped with temperature measuring elements for measuring the surface temperature of the rollers. Using the supported composite filter membrane manufactured by the present invention can greatly improve the shrinkage and formability of the filter membrane material, and can also maintain the The original membrane shape and structure of vinyl fluoride microporous membrane.

Description

A kind of manufacturing equipment of polytetrafluoroethylene composite filter membrane

technical field

The invention relates to a filter membrane manufacturing equipment, in particular to a polytetrafluoroethylene supported composite filter membrane manufacturing equipment.

Background technique

Among polymer materials, polytetrafluoroethylene (PTFE) material has outstanding performance; high temperature resistance, acid and alkali resistance, organic solvent, non-toxic and biocompatibility. When the stretched polytetrafluoroethylene microporous membrane is used for gas or liquid filtration, it has a larger microporous membrane than other polymer materials (such as regenerated cellulose, nylon, polyvinylidene fluoride, polyethersulfone). Open porosity, better particle interception and durability and other comprehensive properties, are currently widely used filter materials in chemical, medical, food, electronics and other fields. However, before the filter membrane is actually applied in the form of a folded filter element, the filter membrane needs to be folded to increase the membrane area and increase the permeability, and the single polytetrafluoroethylene (PTFE) microporous filter membrane is thin, soft, and easily deformed. Not self-supporting. In this way, the filter membrane needs to be supported by one or more layers of other porous materials to be formed during processing. However, if the polytetrafluoroethylene microporous filter membrane is directly folded with the support material, it is not only difficult to fold and form, but also has a high reject rate. Membrane and supporting material are easy to separate, affecting the use effect and service cycle. Therefore, people consider compounding polytetrafluoroethylene microporous filter membranes and supporting materials, but the existing disclosed composite equipment mainly adopts glue-coated continuous composite textile surface accessories equipment, plastic ultrasonic welding equipment, and printing industry widely used in the textile industry. Applied hot press lamination equipment. However, the above equipment and methods have relatively large defects for polytetrafluoroethylene (PTFE) microporous membranes with high melting point and non-adhesive properties. General adhesives will block the micropores, greatly reducing the effective filtration area of the membrane and the products. Breathable performance, and the use of special adhesives or heat-fusible materials is very complicated in synthesis and processing. The support material and the surface of the PTFE microporous membrane are often not laminated firmly enough, which greatly reduces the service life, or the support material is melted to cause waste, etc., and the composite effect is difficult to meet the needs of high-end applications.

Contents of the invention

The technical problem to be solved by the present invention is to provide a manufacturing equipment for a polytetrafluoroethylene supported composite filter membrane in view of the above-mentioned current state of the art, and the support material can be effectively laminated to the polytetrafluoroethylene membrane through the special manufacturing equipment On the surface, not only the lamination is firm, but the yield of the product and the service life of the product are improved, and the air permeability of the polytetrafluoroethylene microporous filter membrane is not affected; the present invention overcomes that a single polytetrafluoroethylene microporous filter membrane cannot automatically Support, easy to deform, not conducive to folding and processing into the defects of commonly used pleated filter elements, and maintain the original membrane structure and membrane pore size, with little impact on air permeability, and greatly improve the shrinkage and molding of filter membrane materials sex.

The technical scheme adopted by the present invention to solve the above-mentioned technical problems is: a kind of manufacturing equipment of polytetrafluoroethylene supported composite filter membrane, comprising a feeding and winding transmission device, a pressing device and a control device, and the control device outputs a control signal to The described feeding and winding transmission device and the described pressing device, the described feeding and winding transmission device includes a polytetrafluoroethylene microporous filter membrane feeding roller, a supporting material feeding roller, a composite film winding roller, PTFE microporous membrane feeding drive rollers, support material feeding drive rollers and composite film winding drive rollers, the pressing device consists of at least one heating composite roller and the heating composite roller The opposite cooling composite roller is formed, the heating composite roller and the cooling composite roller are provided with a speed control device, and at least one of the heating composite roller and the cooling composite roller The shaft is provided with a pressing pressure transmission device, the heating composite roller is provided with a heating device, the cooling composite roller is provided with a cooling device, and the heating composite roller and the cooling composite roller are both A temperature-measuring element is provided for measuring the surface temperature of the roller, and the temperature-measuring element sends a measurement signal to the control device.

The heating device can be a plurality of halogen lamps arranged inside the heating composite roller and evenly distributed, or an electric heating tube or a heating element with oil, water, or gas as the medium, or gas, infrared, microwave, etc. Heating devices for heating by means of high frequency, radiation and steam. The heating device can be arranged outside the composite roller, also can be arranged inside the composite roller or both inside and outside.

The cooling device can be a plurality of fans arranged side by side along the axial direction of the cooling composite roller on one side of the cooling composite roller for forced air cooling, or it can be water-cooled or oil-cooled. . Under certain conditions, such as when the ambient temperature is relatively low, and suitable compounding process parameters make the surface temperature of the cooling compound roll stable in the temperature range required by the method without forced cooling, the cooling device may not be used.

The temperature measuring element can be a thermocouple for direct contact measurement, a thermal resistance for direct contact measurement, or a non-contact infrared temperature measuring element.

The surface of the heating composite roller is preferably coated with mirror-finished stainless steel, and the cooling composite roller can be coated with a rubber outer layer on the stainless steel inner layer.

The feeding and winding transmission device can also be provided with a tension and deviation correction control device, such as composed of a magnetic powder tension control mechanism, a torque motor and an automatic tension controller.

Compared with the prior art, the advantage of the present invention is that the surface temperature of the heating composite roller close to the polytetrafluoroethylene microporous filter membrane is higher than the melting point temperature of the supporting material by the heating device arranged in the heating composite roller, And make the surface temperature of the cooling composite roller close to the support material lower than the heat distortion temperature of the support material by the cooling device arranged below the cooling composite roller, so that the support bonded with the polytetrafluoroethylene microporous filter membrane can be Partial melting of the surface of the material can ensure that the polytetrafluoroethylene microporous filter membrane and the support material are effectively bonded and compounded into one, and will not completely melt the support material or cause the support material to be thermally deformed; The tetrafluoroethylene supported composite filter membrane overcomes the defect that a single PTFE microporous filter membrane cannot be self-supporting and easily deformed, which is not conducive to folding and processing into commonly used pleated filter elements, and greatly improves the shrinkage and molding of the filter membrane material The composite membrane also has excellent solvent resistance and high temperature sterilization properties. The composite equipment has a compact structure and adjustable composite parameters, which can meet the industrial production requirements of large-scale continuous composite of polytetrafluoroethylene microporous membranes; The halogen lamps with even heating are evenly distributed inside the roller, which can ensure a reasonable heating rate and temperature uniformity. According to the production requirements, the equipment of the present invention can be combined with the on-line compounding of the membrane and the support material after stretching and setting in the production process of the polytetrafluoroethylene microporous membrane and before winding, and can also independently complex.

Adopt equipment of the present invention, optimize composite process condition and carry out continuous production, the polytetrafluoroethylene (PTFE) that obtains supports composite filtration membrane performance is stable, the peeling strength of dry and wet state is high, and polytetrafluoroethylene (PTFE) before compounding ) microporous membrane, on the one hand, it maintains the original morphological structure and pore size of the membrane;

Description of drawings

FIG. 1 is a schematic structural view of Embodiment 1 of the present invention;

FIG. 2 is a schematic structural diagram of Embodiment 2 of the present invention;

Fig. 3 is a structural schematic diagram of the cooperation between the pressing device and the hydraulic transmission device of the present invention;

Fig. 4 is the structural representation of hydraulic transmission device of the present invention;

Fig. 5 is a structural schematic diagram of a pressing device, a temperature measuring element and a control device of the present invention;

Fig. 6 is a schematic structural diagram of a cooling device composed of a fan according to the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

Embodiment 1: The manufacturing equipment used by polytetrafluoroethylene support composite filter membrane, its structure includes feeding and winding transmission device 1, pressing device 2 and control device 3, and control device 3 outputs control signal to feeding and winding transmission device 1 and Pressing device 2, feeding and winding transmission device 1 includes PTFE microporous membrane feeding roller 11, support material feeding roller 12, composite film winding roller 13, PTFE microporous membrane feeding and driving Roller 14, supporting material feeding drive roller 15 and composite film winding drive roller 16, pressing device 2 consists of a heating composite roller 21 and a cooling composite roller 22 opposite to the heating composite roller 21 arranged up and down to form, The surface of the heating composite roller 21 is coated with mirror stainless steel, and the cooling composite roller 22 is coated with a rubber outer layer outside the stainless steel inner layer, and the heating composite roller 21 and the cooling composite roller 22 are driven by a speed regulating motor (not shown) Rotate, their rotational speed is controlled by the control signal that control device 3 outputs to speed-regulating motor, and the shaft of cooling compound roller 22 is provided with hydraulic pressure transmission device 23, as shown in the figure, hydraulic pressure transmission device 23 comprises two Symmetrically arranged vertical movement slider 231, pressure gauge 232, hydraulic pipeline system 233 and manual booster handle 234, heating composite roller 21 is provided with a heating device 24 composed of 18 evenly distributed halogen lamps, cooling Below the composite roller 22, five fans are arranged side by side along the axial direction of the cooling composite roller 22 to form a cooling device 25. The heating composite roller 21 and the cooling composite roller 22 are all provided with a temperature measuring element thermocouple 26 to measure the temperature of the composite roller 22. The temperature of the roller surface, the temperature measurement signal is sent to the control device 3, the feeding and winding transmission device 1 is provided with a tension and deviation correction control device (not shown) composed of a magnetic powder tension control mechanism, a torque motor and an automatic tension controller.

Embodiment two: the manufacturing equipment that polytetrafluoroethylene support composite filter membrane is used, basic structure is identical with embodiment one, and difference is that pressing device 2 is made of two heating composite rolls 21 and with heating composite roll 21 relative Two cooling composite rollers 22 are arranged up and down to form.

In the above embodiments, the heating device 24 has no special requirements, and it can be an electric heating tube with oil, water, or gas as the medium, or gas heating, infrared heating, microwave heating, high-frequency heating, radiation heating, steam heating, etc., to heat The device 24 can be arranged inside the heating composite roller 21, also can be arranged outside the heating composite roller 21, or both inside and outside.

There is no special requirement for the cooling device 25, and water cooling or oil cooling can also be used.

The temperature measuring element thermocouple 26 has no special requirements, and can also be replaced by a thermal resistance for direct contact measurement or a non-contact infrared temperature measuring element.

The control device 3 has no special requirements, and can be implemented by using general control elements (such as relays, timers, sensors, regulators, displays) that match the controlled process parameters in the existing industrial automatic control technology, and can also be further realized through data acquisition. Convert the control communication card to realize computer monitoring.

The following examples use the above-mentioned equipment, adjust the structural parameters of the equipment, and carry out the compounding process and application of the polytetrafluoroethylene microporous membrane.

Embodiment 3: It is manufactured by laminating a polytetrafluoroethylene microporous filter membrane with a layer of polypropylene screen, adjusting the parameters of the equipment, and compounding: ① Feed the polytetrafluoroethylene microporous filter membrane The polytetrafluoroethylene microporous filter membrane on the roller and the polypropylene screen set on the supporting material feeding roller are conveyed to the pressing device composed of heating composite rollers and cooling composite rollers arranged up and down through the transmission control system In the process, make the polytetrafluoroethylene microporous filter membrane close to the heating composite roller, and make the polypropylene screen mesh close to the cooling composite roller; ②Through the heating device composed of 18 halogen lamps evenly arranged in the heating composite roller Make the surface temperature of the heating composite roller be 300°C, and make the surface temperature of the cooling composite roller be 20°C by being arranged under the cooling composite roller along the cooling device composed of 5 fans arranged side by side in the axial direction of the cooling composite roller; ③Through the hydraulic pressure transmission device set on the shaft of the cooling composite roller, a pressing pressure of 3 MPa is provided between the heating composite roller and the cooling composite roller in the form of hydraulic transmission, and the polytetrafluoroethylene microporous filter membrane and polypropylene The screens are mechanically pressed together; ④ Control the composite linear speed of the membrane to 5 m/min by controlling the speed of the speed-regulating motor; Roll on a roll.

Embodiment 4: Adjusting the parameters of the equipment and compounding. The basic process is the same as in Example 3, except that the surface temperature of the heated composite roll is 180°C in step 2, the surface temperature of the cooled composite roll is 85°C, and the heated composite roll and cooled composite roll are in step 3. The pressing pressure between them is 20MPa, and the compound line speed in step ④ is 15 m/min.

Embodiment 5: Adjusting the parameters of the equipment and compounding. The basic process is the same as in Example 3, except that the surface temperature of the heated composite roll is 230°C in step ②, the surface temperature of the cooled composite roll is 40°C, and the heated composite roll and cooled composite roll are in step ③ The pressing pressure between them is 10MPa, and the compound line speed in step ④ is 30 m/min.

Embodiment 6: It is manufactured by laminating a polytetrafluoroethylene microporous filter membrane with a layer of polyester non-woven fabric, adjusting the parameters of the equipment, and compounding: ① place the polytetrafluoroethylene microporous filter membrane The polytetrafluoroethylene microporous filter membrane on the feeding roller and the polyester non-woven fabric set on the supporting material feeding roller are transported to the press composed of heating composite rollers and cooling composite rollers arranged up and down through the transmission control system. In the combined device, the polytetrafluoroethylene microporous filter membrane is brought close to the heating compound roller, and the polyester non-woven fabric is brought close to the cooling compound roller; The heating device makes the surface temperature of the heating composite roller be 270 ℃, and the cooling device composed of 4 fans arranged side by side along the axial direction of the cooling composite roller under the cooling composite roller makes the surface temperature of the cooling composite roller be 15°C; ③A pressing pressure of 5 MPa is provided between the heating composite roller and the cooling composite roller through the hydraulic pressure transmission device set on the cooling composite roller shaft, and the polytetrafluoroethylene microporous filter membrane Press together with polyester non-woven fabric mechanically; ④ Control the composite line speed of the membrane by controlling the speed of the speed-regulating motor to 5 m/min; ⑤ Wind the composite support composite filter membrane through the composite membrane winding roller To the composite film take-up roll.

Embodiment 7: Adjusting the parameters of the equipment and compounding. The basic process is the same as in Example 6, except that the surface temperature of the heated composite roll in step ② is 290°C, the surface temperature of the cooled composite roll is 60°C, and the heated composite roll and cooled composite roll in step ③ The pressing pressure between them is 17MPa, and the composite line speed in step ④ is 12 m/min.

Embodiment 8: Adjusting the parameters of the equipment and compounding. The basic process is the same as in Example 6, except that the surface temperature of the heated composite roll is 300°C in step ②, the surface temperature of the cooled composite roll is 40°C, and the heated composite roll and cooled composite roll are in step ③ The pressing pressure between them is 9MPa, and the composite line speed in step ④ is 28 m/min.

Embodiment 9: Manufactured by laminating a polytetrafluoroethylene microporous filter membrane with a layer of nylon screen, adjusting the parameters of the equipment, and compounding: ① put the polytetrafluoroethylene microporous filter membrane on the feeding roller The polytetrafluoroethylene microporous filter membrane on the shaft and the nylon screen set on the supporting material feeding roller are transported to the pressing device composed of heating composite rollers and cooling composite rollers arranged up and down through the transmission control system. Make the polytetrafluoroethylene microporous filter membrane close to the heating composite roller, and make the nylon screen mesh close to the cooling composite roller; The surface temperature of the roller is 300°C, and the cooling device composed of four fans arranged side by side along the axial direction of the cooling composite roller is arranged under the cooling composite roller to make the surface temperature of the cooling composite roller 10°C; ③ by setting The hydraulic pressure transmission device on the cooling composite roller shaft provides a pressing pressure of 5.0MPa between the heating composite roller and the cooling composite roller in a hydraulic transmission mode, and the polytetrafluoroethylene microporous filter membrane and the nylon screen are mechanically Press together; ④ Control the composite line speed of the membrane to 30 m/min by controlling the speed of the speed-regulating motor; ⑤ Wind the composite supporting composite filter membrane to the composite membrane winding roller through the composite membrane winding roller superior.

Embodiment 10: Adjusting the parameters of the equipment and compounding. The basic process is the same as in Example 9, except that the surface temperature of the heated composite roll is 250°C in step 2, the surface temperature of the cooled composite roll is 30°C, and the heated composite roll and cooled composite roll are in step ③ The pressing pressure between them is 20MPa, and the compound line speed in step ④ is 1 m/min.

Embodiment 11: Adjusting the parameters of the equipment and compounding. The basic process is the same as in Example 9, except that the surface temperature of the heated composite roll is 225°C in step ②, the surface temperature of the cooled composite roll is 40°C, and the heated composite roll and cooled composite roll are in step ③ The pressing pressure between them is 10MPa, and the compound line speed in step ④ is 10 m/min.

Adopt the equipment of the present invention, adjust the parameter of equipment, carry out composite continuous production, the performance of polytetrafluoroethylene (PTFE) supporting composite filtration membrane obtained is stable, the peeling strength of dry and wet state is high, and the polytetrafluoroethylene before compounding Compared with (PTFE) microporous membrane, on the one hand, it maintains the original morphology and pore size of the membrane, and on the other hand, the air permeability decreases less, and can maintain more than 85% of the original membrane air permeability.

Claims (6)

1, a kind of manufacturing equipment of polytetrafluoroethylene (PTFE) supported composite filtering film, comprise feeding rolling transmission device, press fit device and control device, described control device outputs a control signal to described feeding rolling transmission device and described press fit device, described feeding rolling transmission device comprises polytetrafluoroethylene (PTFE) miillpore filter feeding roller bearing, backing material feeding roller bearing, composite membrane rolling roller bearing, roller is rolled in polytetrafluoroethylene (PTFE) miillpore filter feeding transmission, roller is rolled in backing material feeding transmission and roller is rolled in composite membrane rolling transmission, it is characterized in that described press fit device is compoundly rolled roller and constitutes with the compound relative cooling combined roller that rolls of roller that rolls of described heating by at least one heating, described heating is compound rolls roller and the described cooling combined roller that rolls is provided with revolution speed control device, described heating is compound rolls roller and describedly cooling combinedly rolls that the axle of at least one is provided with the pressing Pressure Actuated Device in the roller, the compound roller that rolls of described heating is provided with heater, the described cooling combined roller that rolls is provided with cooling device, described heating is compound rolls roller and the described cooling combined roller that rolls is provided with and measures the temperature element that rolls roll surface temperature, and described temperature element is transported to described control device with measuring-signal.

2, the manufacturing equipment of a kind of polytetrafluoroethylene (PTFE) supported composite filtering film as claimed in claim 1 is characterized in that described heater is for being arranged at the compound inner and equally distributed many Halogen lamp LEDs of roller that roll of heating.

3, the manufacturing equipment of a kind of polytetrafluoroethylene (PTFE) supported composite filtering film as claimed in claim 1 is characterized in that described cooling device is along the described cooling combined a plurality of fans that axially are set up in parallel that roll roller in the described cooling combined side of roller of rolling.

4, the manufacturing equipment of a kind of polytetrafluoroethylene (PTFE) supported composite filtering film as claimed in claim 1 is characterized in that described temperature element is a thermocouple.

5, the manufacturing equipment of a kind of polytetrafluoroethylene (PTFE) supported composite filtering film as claimed in claim 1 is characterized in that the compound surface of rolling roller of described heating is coated with mirror face stainless steel, and the described cooling combined roller that rolls is to coat rubber outer outside the stainless steel internal layer.

6, the manufacturing equipment of a kind of polytetrafluoroethylene (PTFE) supported composite filtering film as claimed in claim 1 is characterized in that described feeding rolling transmission device is provided with tension force and the correction control device of being made up of magnetic tension control mechanism, torque motor and automatic tension controller.

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