50 results about "Membrane stretch" patented technology

A spill resistant container (e.g., a sippy cup) including a flow control element including a membrane defining multiple pinholes for controlling the flow of liquid through a drinking spout. The flow control element is mounted on a cover that screws onto a cup-shaped body such that the membrane is positioned between liquid stored in the cup-shaped body and the drinking spout, which is formed on the cap. The flow control element is formed from a suitable elastomeric material (e.g., soft rubber, thermoplastic elastomer, or silicone) such that the membrane stretches when subjected to a differential pressure. The pinholes are formed by puncturing the membrane using one or more pins having a substantially circular cross-section and sized such that each pinhole is closed by the surrounding elastomeric material when the pins are removed.

A flat loudspeaker having a back plate, a driver responsive to an electrical signal, an enhancer having a neck and a mouth, the neck attached to the driver and movable in accordance with the movement of the driver, a thin film membrane, the membrane attached to the enhancer, the membrane stretched over the frame, a frame for supporting the membrane and maintaining it in a taut state, and a rubber type adhesive for dampening the membrane resonances and for adhering the membrane to the frame. Clarity of sound can be further improved by including a plurality of sound breathers in the back plate of the speaker. For improved sound radiation capability, the size and the shape of the enhancer can be modified in various ways, including a frustoconical, parabolic, or bell-shaped enhancer. Dampening material may be provided in the space below or affixed to the membrane to improve sound quality.

A loudspeaker having a back plate, a driver attached to the back plate, the driver being responsive to an electrical signal, an enhancer having a neck and a mouth, the neck attached to the driver and movable in accordance with the movement of the driver, a thin film membrane, the membrane attached to the enhancer, the membrane stretched over the frame, a frame for supporting the membrane and maintaining it in a taut state, and a rubber type adhesive for dampening the membrane resonances and for adhering the membrane to the frame. Clarity of sound can be further improved by including a plurality of sound breathers in the back plate of the speaker. For improved sound radiation capability, the size and the shape of the enhancer can be modified in various ways, including a frustoconical, parabolic, or bell-shaped enhancer.

An improved device for reflecting, radiating, or receiving electromagnetic radiation, acoustic waves, or other energy forms through the use of a membrane stretched across a lightweight, round, frame structure. A near perfectly round and flat semi-rigid backplane surface (1) and a near perfectly round ring or stack of rings (2) are mutually reinforced, forming a raised circumferential planar surface, and a cavity within. A membrane (3) is attached to the top of the rings, forming one wall of a sealed chamber. A source of sub-ambient pressure (4) is applied to the chamber, causing a primary uniform deformation in the membrane for the purpose of manipulating electromagnetic radiation, acoustic waves, or other energy. The backplane surface also deforms uniformly, increasing the strength of the structure. A flat, rigid floating batten (5) prevents waves or wrinkles from forming in the membrane material. A circumferential heating element (6) and insulation (7) provides tensioning of the membrane by slightly controlling the circumference of the device.

An apparatus for determining intraocular pressure includes a transducer assembly containing an applanation tonometer for the determination of a cornea applanation pressure and an ultrasonic pachymeter to determine the thickness of the cornea at the site of applanation. The assembly has a tip end which includes an applanation surface and an ultrasonic coupler surface, and an end cap membrane holder is adapted to fit over the tip end of the transducer assembly and hold a thin film membrane stretched over the applanation and ultrasonic coupler surfaces. The transducer assembly also has a detector for detecting the presence or absence of the end cap membrane holder, the detector may generate a signal to disable movement of the transducer assembly if the end cap is not detected.

The invention provides a temperature-control high-speed large-strain membrane two-way stretching device and an experimental method thereof. A servo motor drives four #-shaped guide rails to move, and a membrane sample is stretched through a scissors mechanism. A high-pressure pneumatic clamp quickly clamps the sample and can realize pressure compensation. Two independent temperature control furnaces are respectively used for preheating the device and stretching the sample. A hot air circulating system can be adopted to realize rapid temperature rise of the control furnaces and also can ensure the temperature uniformity of cavities. Tension sensors are respectively mounted in two stretch directions and used for collecting stress-strain information in the membrane stretching process. The servo motor drives a ball screw so as to enable a stretch part to be switched among different stations. The temperature-control high-speed large-strain membrane two-way stretching device can realize two-way synchronous stretching, two-way asynchronous stretching, limited one-way stretching and unlimited one-way stretching, thus being a good device for simulating industrial membrane stretching processing and establishing the relationship between processing parameters and the membrane structure performance.

A loudspeaker having a back plate, a driver attached to the back plate, the driver being responsive to an electrical signal, an enhancer having a neck and a mouth, the neck attached to the driver and movable in accordance with the movement of the driver, a thin film membrane, the membrane attached to the enhancer, the membrane stretched over the frame, a frame for supporting the membrane and maintaining it in a taut state, and a rubber type adhesive for dampening the membrane resonances and for adhering the membrane to the frame. Clarity of sound can be further improved by including a plurality of sound breathers in the back plate of the speaker. For improved sound radiation capability, the size and the shape of the enhancer can be modified in various ways, including a frustoconical, parabolic, or bell-shaped enhancer.

A baby bottle assembly including a nipple having a substantially flat membrane defining multiple pinholes for controlling the flow of liquid. The nipple is mounted on a cap that screws onto the bottle body. The nipple is formed from a suitable elastomeric material (e.g., soft rubber, thermoplastic elastomer, or silicone) such that the membrane stretches when subjected to a differential pressure. The pinholes are formed by puncturing the membrane while subjecting the membrane to radial tension, and using one or more pins having a substantially circular cross-section and sized such that each pinhole is closed by the surrounding elastomeric material when the pins are removed.

A device for transmitting radio waves comprises an item of transmitting equipment for a telecommunications antenna, a membrane for thermally protecting the reflector, and means for attaching the thermal protection membrane to the item of equipment. The thermal protection membrane is furnished with a plurality of elastic tensioners designed to keep the thermal protection membrane stretched between a first active face of the item of transmitting equipment and space, irrespective of the thermal expansions of the membrane. The item of transmitting equipment occurs in a predetermined temperature range when the attachment means attach the membrane to the item of transmitting equipment.

A microphone shield system captures sound in adverse conditions. The system includes a microphone positioned within an enclosure. A membrane stretched across a portion of the enclosure passes signals within a selected frequency range. The membrane may block or attenuate signals above and / or below the frequency range to pass a desired sound with little surrounding interference.

The invention discloses a sulfonated polyaryl ether ketone (SFPAEK) ion exchange membrane preparation method and application thereof in an all-vanadium redox flow battery, and relates to the field of ion exchange membrane materials. An SFPAEK ion exchange membrane can be prepared from a sulfonic acid polymer and a reinforcing material in a blending and compounding manner; in a membrane preparation process through the processes, such as a flow casting wet method, a hot-pressing dry method, an extrusion dry method, an extrusion and blow moulding dry method and a membrane stretching orientation method, inorganic nanosheets are uniformly dispersed in the basal body of cation exchange resin; a vanadium ion barrier layer is formed; the vanadium ion shuttle effect accompanying in the charging and discharging process of the all-vanadium redox flow battery can be effectively inhibited; the method is simple in process, green, environment-friendly and low in cost; in the implementation process, damage on the membrane itself does not exist; the formed membrane has better mechanical strength; and both the electrical conductivity and the swelling degree of the membrane are ensured.

The present invention provides a door system for a temporary, movable structure having a plurality of spaced apart frame members and a membrane stretched between adjacent frame members. The door system has multiple modules movable between open and closed positions. Each module has its own membrane, separate from the membranes of the structure, which is stretched taught over the surface of the module. In the open position, the modules do not obstruct the opening in the structure, and the membranes of the modules and the structure do not go slack. The membranes of both the structure and the modules are always under tension, thus being less susceptible to damage.

The invention provides a polyethylene composition and a film thereof. The polyethylene composition contains linear low density polyethylene obtained by ethene-alpha olefin copolymerization. The polyethylene composition has weight-average molecular weight Mw of 100000-180000g / mol, a ratio of Mw / Mn is in a range of 4.0-8.5 and a ratio of Mz / Mw is in a range of 4.5-12.5. In polyethylene film preparation based on a flat membrane stretching method, the polyethylene composition has good stretching multiplying power, a high film forming rate and a good film forming ability.

A microphone shield system captures sound in adverse conditions. The system includes a microphone positioned within an enclosure. A membrane stretched across a portion of the enclosure passes signals within a selected frequency range. The membrane may block or attenuate signals above and / or below the frequency range to pass a desired sound with little surrounding interference.

The present invention provides a door system for a temporary, movable structure having a plurality of spaced apart frame members and a membrane stretched between adjacent frame members. The door system has multiple modules movable between open and closed positions. Each module has its own membrane, separate from the membranes of the structure, which is stretched taught over the surface of the module. In the open position, the modules do not obstruct the opening in the structure, and the membranes of the modules and the structure do not go slack. The membranes of both the structure and the modules are always under tension, thus being less susceptible to damage.

An improved device for reflecting, radiating, or receiving electromagnetic radiation, acoustic waves, or other energy forms through the use of a membrane stretched across a lightweight, round, frame structure. A near perfectly round and flat semi-rigid backplane surface (1) and a near perfectly round ring or stack of rings (2) are mutually reinforced, forming a raised circumferential planar surface, and a cavity within. A membrane (3) is attached to the top of the rings, forming one wall of a sealed chamber. A source of sub-ambient pressure (4) is applied to the chamber, causing a primary uniform deformation in the membrane for the purpose of manipulating electromagnetic radiation, acoustic waves, or other energy. The backplane surface also deforms uniformly, increasing the strength of the structure. A flat, rigid floating batten (5) prevents waves or wrinkles from forming in the membrane material. A circumferential heating element (6) and insulation (7) provides tensioning of the membrane by slightly controlling the circumference of the device.

The invention provides an underground polyethylene geomembrane connector and a construction method thereof. The underground polyethylene geomembrane connector comprises a connector body. Grouting grooves are formed in the two sides of the connector body correspondingly. A fixing connecting part is arranged in each grouting groove, wherein the grouting groove and the fixing connecting part extend to the middle portion of the connector body from the side end of the connector body. The two side ends of the connector body are provided with openings leading to the grouting grooves, and accordinglyan impermeable membrane or a permeable membrane stretches into the openings. The fixing connecting parts fix the impermeable membrane or the permeable membrane in a winding manner, a water encountering expansion body is arranged between the inner wall of each grouting groove and the corresponding fixing connecting part, and the impermeable membrane or the permeable membrane is jacked through the water encountering expansion bodies. The underground polyethylene geomembrane connector and the construction method thereof solve the problem about how to apply a polyethylene geomembrane to underground anti-seepage treatment construction, the construction quality and efficiency are further improved, and pollution possibly caused by construction is reduced.

The invention provides a polyethylene composition and a film thereof. The polyethylene composition contains linear low density polyethylene obtained by ethene-alpha olefin copolymerization. The polyethylene composition has weight-average molecular weight Mw of 100000-180000g / mol, a ratio of Mw / Mn is in a range of 4.0-8.0, a ratio of Mz / Mw is in a range of 4.0-6.0 and a ratio of Mz+1 / Mw is in a range of 4.5-12.5. In polyethylene film preparation based on a flat membrane stretching method, the polyethylene composition has good stretching multiplying power, a high film forming rate and a good film forming ability.

A device and method for treating nocturia that transmits a vibratory signal into the lumbar region of a subject. The vibratory signal couples into the subject from a flexible medium, such as a visco-elastic foam, so that the vibratory signal has a dominant frequency. The flexible medium can be a bed mattress, a chair, a recliner, as well as a seat in a vehicle. A vibratory signal source is used to generate the vibratory signal, and can be an oscillating motor. The motor can mount on a membrane stretched across a surface of the flexible medium, or can be supported and held in contact with the flexible medium while on a stand.

An educational system for visualizing sound by a student in a laboratory. The system includes a speaker powered by an audio amplifier. A function generator or a microphone controls the amplitude and frequency of pressure waves originating from the speaker. A model of the ear canal is suspended over the speaker, the model having a plastic pipe with two open ends and a membrane stretched taut over one of the open ends with constant tension. A mirror is affixed to the membrane, creating a mass-loaded membrane. A laser pointer emits light directed toward the mirror. A screen receives a light reflection pattern created by the light reflected from the minor, with the model ear canal, speaker, membrane, and mirror placed equidistant between the screen and the laser pointer. The system is adapted to demonstrate hearing sensitivity to a deaf or hearing-impaired person in an educational setting.

The invention relates to a production line and a preparation method of required elastic and breathable arc-shaped folded type composite non-woven fabric or folded type anti-lateral-leakage non-woven fabric, and surface non-woven fabric and bottom non-woven fabric or non-woven fabric strips can be composited on two surfaces or two sides of an elastic and breathable membrane in a stretching state without application of hot melt glue or stretching of the non-woven fabric and the non-woven fabric strips and the required elastic and breathable arc-shaped folded type composite non-woven fabric or the folded type anti-lateral-leakage non-woven fabric can be formed along with springback reset of the elastic and breathable membrane. The production line comprises a PLC (programmable logic controller), elastic and breathable casting die forming roller groups are arranged below an elastic polymer resin casting die head, multiple pairs of longitudinal elastic and breathable membrane stretching roller groups are horizontally distributed on one side of the elastic and breathable casting die forming roller groups in sequence, composite forming roller groups are horizontally located on one side of the elastic and breathable membrane stretching roller groups at the tail end in the multiple pairs of longitudinal elastic and breathable membrane stretching roller groups, and the roller surfaces of the composite forming roller groups are covered with round grooves and bulge points in concave-convex-point matching.

The invention relates to a waterproof breathable membrane stretching device which comprises a drying oven, an air heater and at least four sets of solid stretching rollers, a membrane inlet and a membrane outlet are formed in the two ends of the drying oven respectively, a hot air opening is formed in each side face of the drying oven, and an air suction opening is formed in the top of the dryingoven; an air inlet of the air heater is in fluid communication with the air suction opening, and an air outlet of the air heater is in fluid communication with the hot air opening; the stretching rollers are arranged in the middle of the same horizontal plane in the drying oven and are separated at equal interval, and the rotating speeds of the stretching rollers are sequentially increased along the advancing direction of a membrane. The membrane is stretched for multiple steps, the stretching rate of each step is small, the membrane can be fully and evenly stretched, the air permeability is even, the width is reduced little, and the product yield is increased; and the membrane is uniformly heated in the drying oven by adopting heated air, so that the heating temperature of the surface ofthe membrane is more uniform compared with an existing conduction oil heating mode, and the stretching is more uniform.

An externally supported foil with reversible camber and variable chord length is described that allows a thin foil of efficient deformed shape to generate lift equally on opposite angles of attack to a fluid flow. The foil is supported at the leading and trailing edges to ribs that are in turn connected to spanwise spars forming an external structure attachable to a body. The foil is held by leading edge hinge(s) and trailing edge elastic membrane(s) along the span or at the ribs. Membrane pretension keeps the foil taut while generating no lift when parallel to a flow. When rotated by an external mechanism to generate an angle of attack, the membrane stretches due to the differential pressures generated on the foil surface; thereby, passively increasing the chord length and camber. Rib cutouts dictate the deformed aerodynamic or hydrodynamic foil shape that then generates lift.

The invention discloses a diffusion film feed mechanism which comprises a machine frame, a diffusion film winding device, a base material, a protective film winding device, a film peeling device and a membrane conveying device. The film peeling device comprises a film peeling upper plate and a film peeling lower plate. The bottom plane of the film peeling upper plate and the top plane of the film peeling lower plate are parallel and spaced by a certain distance. The membrane conveying device is located beside the film peeling device. The height of a conveying belt of the membrane conveying device is slightly smaller than that of the top plane of the film peeling lower plate. During operation, the free end of diffusion film penetrates through the space between the film peeling upper plate and the film peeling lower plate, an operator separates a membrane at the free end of the diffusion film from the base material and protective film, the membrane stretches across the film peeling lower plate and the conveying belt of the membrane conveying device, and the base material and the protective film are wound around a base material winding device and the protective film winding device in an inclined-downwards direction and an inclined-upwards direction respectively through a gap between the film peeling lower plate and the membrane conveying device.

The invention provides a polyethylene composition and an antistatic film. The polyethylene composition contains a conductive filling material, a component A, a component B and a component C; the component A is ethane / alpha alkene copolymerized linear low density polyethylene, the fusion index MIA is 0.01-2 g / 10 min under temperature of 190 DEG C and loading of 2.16 kg, density RhoA is 0.880-0.936 g / cm<3>; the component B is ethane / alpha alkene copolymerized linear low density polyethylene, the fusion index MIB is 2.1-14.9 g / 10 min under temperature of 190 DEG C and loading of 2.16 kg, density RhoB is 0.910-0.930 g / cm<3>; the component C is ethane / alpha alkene copolymerized linear low density polyethylene, the fusion index MIC is 15-150 g / 10 min under temperature of 190 DEG C and loading of 2.16 kg, and density RhoC is 0.880-0.930 g / cm<3>. The polyethylene composition employs a flat membrane stretching method for preparing a polyethylene film, the stretching ratio is large, film forming rate is high, and the obtained film has good antistatic property.

The invention provides a combined angle regulator for a suspension membrane hollow glass membrane stretching frame. The angle regulator is formed by combining a spring frame pin device, a dry frame corner key and a corner connector which correspond to a spring frame, a dry frame and a partition bar in the stretching frame and made of three different profiles. The spring frame pin device comprises three different pins corresponding to different channels, a dry frame pin corresponds to an inner cavity of the dry frame, a trapezoid inner cavity is formed in the pin, the root portion intersection of the pin device is provided with a boat-shaped pipe, oval holes are formed in a square tube, round holes are formed in the two side walls of the square tube, insertion arms in butt joint with the middle partition bar profile are arranged on the two sides of the connector, connected with a flange of the dry frame and in planar butt joint with the spring frame, the connection root portions of the insertion arms are vertical ribbed plates, the upper section and the lower section are connected to clamping grooves of the two pin device root portions, an oval short pipe is arranged on a transverse ribbed plate extending to the inside of the waist portion, and the two ends of the short pipe are inserted into the oval holes in the square tube, so that the three profiles obliquely cut by 45 degrees are assembled as a whole at an end corner.

The invention discloses a test device and a test method for detecting the impermeability of a waterproof coiled material in a stretched state. The test device for detecting the impermeability of a waterproof coiled material in a stretched state includes a simple material stretching device and a fixed and fixed waterproof coiled material. Indenter device, the test method of the test device for testing the impermeability of waterproof membranes under tension. The specific steps are to use a tape measure to measure the parallel distance between two groups of angle steels, and simultaneously screw the nuts on the two groups of screw rods outwards synchronously until The stretching of the waterproof membrane reaches 100%; fill the pressure head with water, and pressurize the pressure head with a manual hydraulic pump, so that the waterproof membrane can be stretched 100% and kept under a certain water pressure for 120 minutes. Observe whether the filter paper has discoloration and whether the waterproof membrane has water seepage, and make a judgment. The test device of the present invention has the advantages of simple structure, convenient installation and low manufacturing cost, and at the same time, the test method process of the test device for detecting the impermeability of waterproof coiled materials in a stretched state is simple and easy to operate.

The invention relates to a method for controlling electrolytic efficiency of a solid electrolyte (SPE) water-electrolysis hydrogen production plant. A solid electrolyte membrane stretching device is added on the basis of the original SPE water electrolysis device to implement the controllable water electrolysis efficiency. The traditional SPE water electrolysis device comprises a frame, pole plates, a seal ring, a membrane-electrode (MEA) component and the like. The membrane stretching device mainly comprises a bracket, a rotating shaft set and a stretching quantity measuring part. The method can change the electrolytic efficiency according to needs: after one SPE electrolysis process is completed, the SPE electrolysis bath is taken down, the membrane electrode is quantitatively stretched, and the electrolysis bath is fastened again to perform the water electrolysis at a certain stretching rate. The method is simple to operate, and is convenient and feasible.