72 results about "Paper filter" patented technology

The invention discloses a gasoline filter element assembly machine and a using method thereof, and belongs to the technical field of gasoline filter element assembly.The gasoline filter element assembly machine comprises a workbench, a plurality of filter material positioning mechanisms are linearly arranged on the side wall of the workbench at equal intervals, and paper filter materials to be glued are arranged on the filter material positioning mechanisms; a downward pressing mechanism is arranged at each circular opening in the upper surface of the workbench, an end cover is arranged at the output end of each downward pressing mechanism, the filter material positioning mechanism comprises a cylinder, a cover body and a chassis, a limiting plate is arranged on the side wall of the cylinder, the front edge of the limiting plate can make contact with a crease of a paper filter material, and a gluing mechanism is arranged above the cylinder. The folding marks of the paper filter material are limited, deformation, deviation and adhesion of the folding marks during gluing are avoided, the design can be adjusted to adapt to filter materials with different folding mark numbers, universality is improved, glue brushing is guided, glue consumption is reduced, overflowing and hole blocking are prevented, the filter area is guaranteed, the process is simplified through integrated design, the rejection rate is reduced, and the filter performance and efficiency are both considered.

The invention discloses a paper composite filter material for reducing hydrocyanic acid and crotonaldehyde and a preparation method and application thereof, and the preparation method comprises the following steps: adding a gelator into a solvent to form a gelator solution; transferring the gelator solution into a liquid storage tank of an intaglio printing device, and printing and coating the gelator solution in the liquid storage tank onto a paper base material by using an anilox roller; the coated paper base material is conveyed to a low-temperature tunnel, so that nanofibers of a three-dimensional network structure are formed inside and on the surface of the paper base material in a self-assembly mode; and transferring the paper base material subjected to low-temperature treatment to a drying cylinder, and drying to obtain the paper composite filter material. According to the prepared paper composite filter material, the specific surface area in contact with smoke can be increased, the paper composite filter material can make full contact with the smoke in the process that the smoke passes through a filter stick, the interception capacity of the paper filter stick on hydrocyanic acid and crotonaldehyde in mainstream smoke of cigarettes is improved through amino and carboxyl groups on the surfaces of the nanofibers, and the sensory quality of the cigarettes with the paper filter stick is improved.

A filter portion 30 for a flavor inhalation article, the filter portion 30 comprising: a paper filter filled with a sheet member such that voids are formed in a longitudinal direction; and a hollow member 33 provided in the paper filter in the longitudinal direction of the filter portion 30 and having a filtration rate lower than that of the paper filter, in which at least one end of the hollow member 33 is provided at a position within a predetermined distance from an end of the filter portion 30 in the longitudinal direction.

An unheated-type aerosol-generating article comprises a tobacco medium filled in at least one of a cellulose acetate filter and a paper filter, wherein the tobacco medium comprises: granules including tobacco powder; and an aqueous PH-adjusting solution including a pH adjusting agent and moisture, and the tobacco medium may contain 8-9 wt% of moisture with respect to the dry weight of the tobacco medium.

The utility model belongs to the technical field of cigarette filter stick production, and particularly relates to a ternary composite filter tip for improving the comfort level of an ultra-low tar cigarette, which consists of a paper filter stick section, a quality-improving and aroma-enhancing section, a special-shaped hollow core section and molding paper, and the paper filter stick section, the quality-improving and aroma-enhancing section and the special-shaped hollow core section are sequentially arranged from a tobacco shred end to an inlet end and are wrapped and fixed by the molding paper. The ternary composite filter tip has the functions of reducing tar, guaranteeing the physiological satisfaction of smoking, improving the comfort level and fragrance quality of smoke and improving the state of the smoke, the hollow core structure can be designed into various shapes, and the purpose of novel and unique appearance is achieved.

The utility model belongs to the field of diesel engine detection, and particularly relates to a combustible gas detection device. Comprising a manual three-way valve, two ports of the manual three-way valve are respectively used for sampling, a fuel gas purification device is connected behind the manual three-way valve, a float-type flowmeter used for testing combustible gas flow is connected behind the fuel gas purification device, and the float-type flowmeter is located between the fuel gas purification device and a paper filter. A pumping type leakage detector is connected behind the paper filter; and the fuel gas purification device, the float type flowmeter, the paper filter and the pumping type leakage detector are connected in series on the same branch. The manual three-way valve comprises a port A and a port B, and the port A is connected to the crankcase ventilation sampling port through a hose; and the port B is used for gas sampling calibration. The fuel gas purification device comprises a primary filter and a secondary filter, and the secondary filter is connected to the rear side of the primary filter in series. The combustible gas explosion limit detection device can detect the combustible gas explosion limit and improve the safety.

This invention relates to a paper filter material, its preparation method, and its application. The preparation method of the paper filter material includes the following steps: S1. Preparing flash-dried pulp, mercerized pulp, cylinder-dried pulp, and water into a slurry; S2. Applying internal sizing to the slurry obtained in step S1, followed by molding, dewatering, and drying to obtain a base paper; S3. Applying surface sizing to the base paper obtained in step S2 using starch, followed by drying to obtain the paper filter material. The paper filter material obtained by this preparation method maintains good air permeability and high bulk. When used as a filter element, it forms a paper filter rod with low suction resistance and good suction resistance stability, which can replace current cellulose acetate filter rods, balancing production cost, environmental protection, and suction experience.

The utility model discloses a quick-cleaning dry cleaning machine with a filter structure, which relates to the technical field of dry cleaning equipment and comprises a dry cleaning machine body, a side mounting box is mounted on one side of the dry cleaning machine body, a filter box is mounted in the side mounting box, a return pipe is fixedly mounted at the return end of the dry cleaning machine body, and the filter box is mounted in the return pipe. One end of the return pipe extends into the filter box, a filter screen is installed in the filter box, and a paper filter plate is installed in the filter box and located on one side of the filter screen. The filter device has the advantages that quadruple filtration is adopted, the filter screen can filter large fibers, threads and wool on clothes, the paper filter plate can filter small fibers, and the filter screen can filter the threads and the wool on the clothes; the activated carbon filter plate can absorb color faded during oil cleaning, and the carclazyte filter plate performs reverse osmosis for dilution, so that an effective filtering effect can be achieved, the oil can be recovered to an original state, the cleaning oil can be recycled, the cleaning effect is improved, and the condition of mixed dyeing is avoided.

The invention belongs to the technical field of tobacco processing, and provides an aroma-enhanced paper filter stick based on bioelectric fermentation and a preparation method thereof.The aroma-enhanced paper filter stick comprises modified high-permeability forming paper and effective aroma components fixed to the modified high-permeability forming paper through a loading and drying process and derived from a tobacco concentrated solution, the surface of the modified high-permeability forming paper is coated with an adsorption enhancer prepared by mixing polyvinyl alcohol and nano silicon dioxide as raw materials; the tobacco concentrated solution is prepared from waste tobacco as a raw material through bioelectric fermentation in a weak electric field. The aroma characteristic of the tobacco concentrated solution is directionally optimized through the bioelectric fermentation technology, the brand-new aroma-enhanced paper filter stick is prepared in cooperation with the modified high-permeability forming paper preparation technology, and the problems that a traditional filter stick is poor in aroma enhancement effect, insufficient in aroma coordination, high in production energy consumption and poor in environmental protection property can be solved.

This disclosure provides a paper filter rod comprising: a filling material and an inner filter rod forming paper surrounding the filling material, wherein the average area of ​​the pores formed in a cross-section perpendicular to the long axis is less than 0.15 mm. 2 The hardness in the direction perpendicular to the long axis, as defined in formula (1), is greater than 75% and satisfies formula (2). Hardness (%) in the direction perpendicular to the long axis = (Dd / Ds) × 100 (1) Pressure drop per 1 mm length in the long axis direction / filling density of the filler material < 22 mmH2O × mm 2 / mg (2)

The invention discloses a cigarette filter rod made of reconstituted tobacco and a preparation method thereof. The preparation method comprises the following steps: performing enzymolysis extraction on tobacco stems and tobacco powder; the extraction residues and wood pulp are mixed and ground into pulp, and the pulp is manufactured into a three-layer composite substrate with the middle layer being activated carbon powder through a twin-wire forming machine; concentrating the tobacco powder extracting solution under reduced pressure, coating the concentrated tobacco powder extracting solution on a three-layer composite substrate, and drying and rolling; and cutting the reconstituted tobacco roll into strips with the width of 5-15cm, twisting the strips into a rope, and coating a layer of cigarette paper to obtain the cigarette filter tip rod. According to the invention, the sandwich-net-shaped three-layer composite substrate with the activated carbon as the middle layer is adopted, so that the filter capacity is enhanced, the falling of activated carbon powder can be reduced, and the quality stability of the filter stick is improved; the process of combining tunnel type airflow drying and microwave drying is adopted, so that the problem of fiber shrinkage and collapse can be relieved, and the suction resistance of the paper filter stick is reduced; by adopting the process of twisting the reconstituted tobacco into the rope to manufacture the filter stick, the compression resistance and the tension resistance of the filter stick can be improved, and the thermal collapse problem of the filter stick is relieved.

A method for making a pre-packaged single-use on-demand beauty care product comprises providing a beverage filter cartridge containing a dry ingredient mixture, inserting it into a single serve beverage brewer, introducing water, brewing to produce a liquid beauty care product, and dispensing into a collection container. The dry ingredient mixture may include natural ingredients like rice, herbs, and botanicals. The beverage filter cartridge has a higher micron filter than standard paper filters. The brewer may be a Keurig or Nespresso machine, with cartridges compatible with various pod systems. The method allows for convenient production of fresh, preservative-free beauty formulations using existing beverage brewing equipment. Benefits include customization, quality control, and on-demand preparation. The liquid product can be applied to hair and scalp for cleansing, nourishing and moisturizing effects. Overall, the invention provides a novel approach to natural beauty care combining convenience and effectiveness.

The utility model discloses an unprocessed grain drying tower with a waste gas settling and collecting mechanism, and relates to the technical field of agricultural mechanical equipment, the unprocessed grain drying tower comprises a grain drying tower, the left side of the grain drying tower is fixedly connected with two groups of hot air pipes, and the unprocessed grain drying tower with the waste gas settling and collecting mechanism is provided with a cyclone separator and a paper filter plate. When the grain drying tower is used, the sucking pump can be started to suck waste gas in the grain drying tower into the cyclone separator for sedimentation, after the waste gas enters the cyclone separator, linear motion of airflow is changed into circular motion, particles move towards the conical wall of the barrel under the action of centrifugal force, and large particles are spirally thrown downwards into the storage box to be collected. Light-weight air is sucked into the air sucking pump through the air outlet, is firstly primarily filtered by the paper filter plate, then is secondarily filtered by the molecular sieve filter plate, and finally is finally filtered by the activated carbon filter plate, so that the waste gas is deodorized, and the problem that the device cannot settle and collect the waste gas is solved.

The utility model relates to the technical field of beauty and health maintenance, and discloses a paper core filter suitable for an SPA nozzle, which comprises a tube body, the top end of the tube body is fixedly connected with an observation tube, the inner wall of the observation tube is fixedly connected with an indicator board, the inner wall of the indicator board is communicated with a hollow tube, the left side and the right side of the top of the indicator board are respectively provided with a digging groove, and the left side and the right side of the top of the indicator board are communicated with the hollow tube. A sliding column is slidably connected to the inner wall of the hollow pipe, a limiting block is fixedly connected to the outer wall of the sliding column, a second spring is fixedly connected to the top of the limiting block, and a baffle is fixedly connected to the bottom end of the sliding column. According to the utility model, the baffle plate is upwards extruded through water pressure so as to extrude the spring II, so that the sliding column moves in the hollow pipe, and after the baffle plate is lifted, the connecting rod is also lifted to drive the identification rod to be lifted upwards and slide in the digging groove, thereby achieving the purpose of reminding a user to replace the filter element and improving the use experience; and the influence on the use experience of the user is avoided.

The invention relates to the technical field of cigarette filter stick paper, in particular to paper filter stick paper for cigarettes and a preparation method thereof, and the paper filter stick paper comprises the following raw materials in parts by weight: 250-300 parts of water, 35-40 parts of a first base material, 30-35 parts of a second base material, 6-8 parts of glycerol, 2-3 parts of triethyl citrate, 8-12 parts of aluminum hydroxide, 2-4 parts of citric acid and 8-12 parts of an additive. According to the invention, the corn starch selectively oxidized by sodium periodate is used as a first base material, and the bamboo pulp fiber subjected to fine treatment is used as a second base material, so that the traditional cellulose acetate is completely replaced, the biodegradation rate of the filter stick in the environment is obviously accelerated, and the pollution problem caused by material inertia is fundamentally solved.

This utility model provides a filtration device for a laminator, relating to the field of laminator filtration technology. It aims to solve the problems of poor filtration efficiency in existing vacuum pumps that use conventional paper filter elements to filter the gas generated during vacuuming. This allows impurities such as welding slag and iron filings to penetrate the filter element and enter the vacuum pump cavity, affecting normal operation. Furthermore, the accumulation of impurities and dust necessitates frequent inspection, maintenance, and upkeep of the vacuum pump and filter, increasing maintenance costs. The proposed device includes a vacuum pump system with a laminator vacuum valve installed on its left side. A filter tank system is installed between the vacuum pump system and the laminator vacuum valve. The tank serves as a pre-vacuum tank to pre-vacuum the cavity. A bypass design is used; after pre-vacuuming, the filter tank's function is disabled, and the pump directly evacuates the cavity, reducing pump load, effectively improving equipment evacuation efficiency, reducing vacuum pump filter consumption, and minimizing pump maintenance.

A hollow composite filter stick with variable draw resistance relates to the technical field of cigarettes and comprises a filter element and a wrapping layer (1), the filter element comprises a plurality of cylindrical first filter element sections (2) and a plurality of cylindrical second filter element sections (3), the first filter element sections (2) are formed by spirally curling crepe paper from inside to outside, and the second filter element sections (3) are formed by spirally curling crepe paper from inside to outside. A cavity section (4) is arranged between the first filter element section (2) and the second filter element section (3) at an interval, the first filter element section (2), the cavity section (4) and the second filter element section (3) are arranged in sequence, and after the first filter element section (2), the cavity section (4) and the second filter element section (3) are cut into the filter tip, each section of the filter tip comprises one section of the first filter element section (2), one section of the cavity section (4) and one section of the second filter element section (3). The contact area between smoke and the surface of crepe paper can be reduced by pushing the paper filter stick at the near lip end inwards, and the suction resistance of the filter stick is reduced. And on the premise of ensuring tar adsorption, the smoking experience feeling is improved.

The utility model discloses a cigarette paper core filter stick and a cigarette, and the cigarette paper core filter stick comprises a filter stick core which comprises a strip-shaped filter structure made of a paper material; the fixing layer comprises an annular structure formed by acetate fiber tows, and the annular structure wraps the filter rod core. The paper core filter stick for the cigarette is good in shape stability, not prone to being affected with damp and good in heat insulation effect after a filter tip is formed.

The invention discloses an auxiliary feeding device for paper filter sticks, and belongs to the technical field of filter stick production feeding. The device comprises a bearing mechanism which comprises a bearing frame and a support installed on the bearing frame, and an inclined high-pressure nozzle is installed on the support; the carding part is installed on the support and located above the high-pressure nozzle, the carding part is located on the inclined axis of the high-pressure nozzle, and the paper tape penetrates through the high-pressure nozzle to be wound on the carding part so as to be sorted and preliminarily gathered. A plurality of paper tapes can be gathered after passing through the carding part, the paper tapes can be prevented from floating, swinging, high-frequency shaking and even wrinkling under the influence of airflow, the feeding stability of the paper tapes is improved, the plurality of paper tapes can be gradually gathered together in the continuous moving process in the gathering mechanism, and therefore after the subsequent paper tapes enter a cigarette gun, the paper tapes can be separated from the cigarette gun. And the problems that the density of the formed paper tape is not uniform and the compactness is not enough can be well avoided.

The utility model relates to the technical field of samplers, in particular to an industrial sewage sampler with a filtering function. The industrial sewage sampler with the filtering function comprises a sampling barrel, a connecting pipe, a piston block, a connecting rod and a compression spring, the bottom of the sampling barrel is connected and communicated with the connecting pipe, the piston block is connected to the lower side in the sampling barrel in a sealing and sliding mode, the connecting rod is connected to the top of the piston block, and the upper end of the connecting rod penetrates out of the top of the sampling barrel. A compression spring is connected between the lower end of the connecting rod and the top in the sampling barrel. Large impurities in sewage are primarily intercepted through the outer wall of the filter cartridge, then first-stage deep filtration (adsorption of organic pollutants, peculiar smell and the like) is realized through the activated carbon filter element, finally second-stage fine filtration (removal of tiny suspended particles) is completed through the paper filter element, and the purity of a sampling solution is greatly improved through the synergistic effect of third-stage filtration. The requirement of subsequent detection on the cleanliness of the sample is met.

The present disclosure provides a filter portion (30) for a flavor inhalation article (1), the filter portion comprising a paper filter and an object (33) disposed within the paper filter, where the object (33) is harder than a location of the paper filter where the object (33) is not disposed.

The utility model discloses an elevator lubrication station frequency conversion speed regulation flow control device which comprises a lubrication station, the lubrication station is connected with a speed reducer through a lubricating oil pipeline, the lubrication station comprises an oil tank, and a gear oil pump, a safety valve, a motor, a one-way valve, an electric contact thermometer, an electric heater, a gate valve and a liquid level meter are installed on the oil tank. A return oil filter is installed in the oil tank, an air filter located above the return oil filter is installed on the oil tank, the safety valve extends into the oil tank through a lubricating oil pipeline, the oil tank is connected with the electric contact pressure gauge through the lubricating oil pipeline, and a gear oil pump penetrating out of the oil tank is installed on the motor. The gear oil pump is connected with a paper oil filter through a one-way valve, the oil tank is connected with the cooler through a lubricating oil pipeline, the motor is electrically connected with a variable-frequency speed regulation device with a flow closed loop, the variable-frequency speed regulation device is electrically connected with a PLC, and the PLC is electrically connected with an intelligent control instrument. Flow closed-loop regulation is achieved, and safe operation of the speed reducer is ensured.

The application discloses a hanging ear labeling machine and belongs to the technical field of hanging ear coffee manufacturing equipment. The hanging ear labeling machine comprises a box body, an ear piece film frame assembly, a waste material collecting assembly, a cutter die assembly, a film and ear piece feeding assembly, a sealing assembly, a cutting assembly, a film placing and collecting assembly and a film pulling assembly are arranged on the box body. A label paper roll is arranged on the ear piece film frame assembly. The cutter die assembly cuts the label paper into hanging ear-shaped label paper and continuous waste label paper. The film placing and collecting assembly is used for feeding the un-labeled paper filter roll into the film and ear piece feeding assembly and for winding the labeled paper filter roll onto a material collecting roll. The film and ear piece feeding assembly is used for feeding the un-labeled paper filter roll and the label paper into the sealing assembly. The sealing assembly extrudes and adheres the hanging ear-shaped label paper to the surface of the un-labeled paper filter roll after heating to form a labeled paper filter roll, which is convenient for subsequent sealing to form a pocket with a hanging ear, and finally, coffee powder is filled into the pocket to form a hanging ear coffee.

The invention relates to the technical field of industrial waste resourceful treatment, in particular to a waste aluminum electrolytic capacitor recycling method which comprises the steps that waste A is obtained through a crusher, the waste A is conveyed to a cyclone dust collector to recycle crushed dust, and waste B is conveyed to a first-stage air separation machine; the waste material B is separated through a first-stage air separation machine to obtain electrolytic paper and a waste material C, the electrolytic paper is fed into a hydraulic crusher through a conveying belt to be crushed, a waste material D at a discharging opening of the hydraulic crusher is washed through a 6S shaking table to obtain a solid-liquid mixture, the solid-liquid mixture is fed into a filter press to obtain an electrolytic paper filter cake and press filtrate, and the press filtrate is subjected to chemical treatment; aluminum foil and waste E are separated from the waste C through a second-stage air separation machine; a guide pin and a waste material F are separated from the waste material E through a magnetic separator; aluminum sheets and rubber plugs are separated from the waste material F through a color sorter. According to the waste aluminum electrolytic capacitor recycling method, the waste aluminum electrolytic capacitor is harmlessly treated in a physical and chemical combined treatment mode, and the good separation and recycling effect is achieved.

A flavor inhalation article 1 comprising: a base material portion 10 comprising an aerosol source 11; and a nozzle portion (50) through which aerosol generated in the base material portion (10) passes, in which the nozzle portion (50) has a filter (31) which is a paper filter obtained by filling a sheet member such that a gap is formed in the longitudinal direction of the nozzle portion (50), and a low-filtration member (33) which is provided between the filter (31) and the low-filtration member (33). The low filtration member is provided in the filter 31 and has a filtration rate lower than that of the filter 31.

The invention discloses a paper filter stick forming device and a manufacturing method of a paper filter stick, relates to the field of tobacco production, and solves the problems of positioning deviation, untight fitting and the like in the process of producing a paper filter stick through a forming machine, so that the working procedure efficiency and the qualified rate of products are very low. The invention relates to a paper filter stick forming device, which comprises a nozzle, a paper filter stick forming device and a paper filter stick forming device, the winding part comprises a supporting seat, a rotating wheel and a paper disc, a conveying through hole is formed in the supporting seat, the nozzle faces the conveying through hole, so that a paper material strip output by the nozzle can penetrate through the conveying through hole to be conveyed, the rotating wheel is arranged on the supporting seat, the paper disc is fixed to the rotating wheel, and forming paper is arranged on the paper disc; the rotating wheel is used for driving the paper disc to rotate around the conveying through hole on the supporting base, so that the forming paper on the rotating wheel is spirally wound around the paper material strip. The main purpose is to improve the production efficiency of the paper material filter stick by improving the hardness and roundness of the paper material filter stick.

A non-heating aerosol generating article includes a tobacco medium filling at least one of a cellulose acetate filter or a paper filter, the tobacco medium includes granules including tobacco powder, and a pH adjusting aqueous solution including a pH adjuster and moisture, and the tobacco medium includes 8 wt % to 9 wt % of moisture with respect to a dry weight of the tobacco medium.

A beverage cap with a pressure activated valve for use with a press filter having a hollow cylinder and a removable piston, liquid being forced through the cylinder and beverage cap into an open container when the piston is pressed. Such a press filter is particularly suitable for coffee beverages, in particular espresso coffee. The beverage cap includes a plurality of protrusions distributed discontinuously to improve filter support and more uniformly distribute pressure throughout the cavity and along the filter, allowing thin paper filters to be used and avoiding tear or rupture. The beverage cap may include a removable valve insert that includes a valve body that supports the movable valve and a support member that supports the filter in a central valve region that further reinforces the filter to avoid breakage of the paper filter. The beverage cap may include a gasket to enhance a hermetic seal with the cylinder, and may include a plurality of valves for use with an oversized press filter.

The utility model relates to the field of filter element assembly, in particular to a paper element feeding device of paper filter element assembly equipment. Comprising a support frame; the feeding conveying belt mechanism is fixedly connected to the supporting frame and comprises a first conveying belt and a second conveying belt, the conveying directions of the second conveying belt and the first conveying belt are opposite, and connecting platforms are arranged between the two ends of the first conveying belt and the two ends of the second conveying belt; each jig frame comprises a moving table and a paper core groove, and the jig frames are placed on the conveying belt; the reversing mechanisms are arranged on the two sides of the two ends of the feeding conveying belt mechanism and comprise reversing push rods used for pushing the jig frame to the conveying belt on the far side; the reversing optical fiber probe is used for detecting whether a jig frame is arranged in front of the reversing push rod or not and controlling the reversing push rod to work; the jig frames can be recycled, and the number of the jig frames can be increased according to needs.

The utility model provides a waterwheel type negative pressure dust collecting and filtering device which comprises a water collecting box, a paper filtering box, a waterwheel type wheel set, a filtering water box and a dust collecting hopper, the paper filtering box communicated with the water collecting box is arranged on one side above the water collecting box, and the waterwheel type wheel set is arranged above the paper filtering box and comprises an outer box and waterwheel wheels arranged in the outer box. An air inlet and a first liquid inlet are further formed in the outer portion of the outer box, the air inlet is connected with the dust collecting hopper, the waterwheel wheel is driven by a waterwheel motor to rotate, the waterwheel wheel rotates to generate negative pressure to suck dust and steam in the area where the dust collecting hopper is located into the outer box, and the dust and steam are mixed with cutting fluid entering the outer box from the first liquid inlet and then discharged into the filter paper box from the bottom of the outer box; the filter paper box is used for primarily filtering the cutting fluid mixed liquid, and the filter water tank is fixed above the water collecting tank through a support and used for secondarily filtering the cutting fluid. According to the utility model, not only can the cutting fluid of the grinding equipment be filtered and recycled, but also dust and steam in the grinding process can be sucked into the cutting fluid to be filtered.