44results about How to "Uniform air permeability" patented technology

Provided are an electromagnetic wave absorbing sheet which is a thin film and a low cost and has an excellent electromagnetic wave absorbing rate, a method of manufacturing the same, and an electronic device using the same. The electromagnetic wave absorbing sheet includes: at least one layer thin-film magnetic sheet which is separated into a plurality of fine pieces; a protective film that is adhered on one surface of the thin-film magnetic sheet; and a double-sided tape that is adhered on the other surface of the thin-film magnetic sheet.

The purpose of the invention of the present application is to provide a composite membrane support formed by dry thermoplastic long fiber non-woven fabric, and a high-performance composite membrane and composite membrane element using it. The composite membrane support has the ability to be formed on Extremely high uniformity of the porous layer without defects such as offset and pinholes during film formation, no defects in the skin layer when forming the skin layer, and excellent mechanical strength and dimensional stability at high temperatures. The composite film support of the invention of the present application is characterized in that it is a laminated dry thermoplastic long fiber of more than three layers comprising at least a melt-blown fiber layer in the middle layer and a spunbond fiber layer on both sides of the middle layer. For non-woven fabrics, the average value of the air resistance is 2.0 to 30.0 kPa·s / m, and the ratio of the average value to the standard deviation of the air resistance is 0.6 or less.

A method for forming a patterned noble metal coating on a gas diffusion medium substantially free of ionomeric components comprising subjecting an electrically conductive web with a patterned mask overlaid thereto to a first ion beam having an energy not higher than 500 eV, and to a second beam having an energy of at least 500 eV, containing the ions of at least one noble metal and a gas diffusion electrode.

The invention provides polylactic acid forming paper adopting polylatic acid fibers as a raw material and a preparation method thereof so as to solve the vices of hair slip and powder drop of the conventional forming paper and reduce excessive consumption of production of the conventional forming paper on resources to a certain extent. The invention adopts the following technical means: the polylactic acid forming paper comprises the following components in parts by weight: 15-65 parts of polylactic acid fibers, 15-20 parts of hardwood fibers with whiteness of 80-85% and 10-15 parts of polyester fibers, wherein the polylactic fibers are 4-6 mm long, and the fineness is 1-5 D; the polyester fibers are 4-10 mm long and the fineness is 0.5-1.4 D; the ratio of the forming paper is 10-50 g and the air permeability is 500-50000 um / pa.s.

The invention discloses an anti-drilling velvet gray fabric, which comprises interwoven warp yarns and weft yarns, the warp yarns include cationic dyeable modified polyester staple fibers and cotton fibers dyed with reactive dyes, and the weft yarns include cationic dyeable modified polyester fibers. permanent polyester filaments and polyester filaments dyed with disperse dyes; the warp and weft are treated with cationic windproof softener for anti-drilling finishing. The present invention introduces anion dye bases into the cationic modified fiber molecular structure chain, and through the adsorption of anions and cations, the cationic windproof softener is evenly distributed on the surface of the fabric, and the air permeability of the finished product is uniform, the anti-drilling performance is stable, and the hand feels soft; the fabric is matched with cations Modified fiber can not only produce gray effect, but also ensure the appropriate reduction of warp and weft yarn density of the fabric under the same anti-drilling performance, and the utilization of cationic windproof softener is high, thereby reducing the cost of fabric, and can be widely used in actual production .

The invention relates to cigarette paper conveying equipment capable of conveying double-layered cigarette paper. The equipment comprises two paper retreating machines, namely a left paper retreating machine (1) bearing internal layer cigarette paper bobbin, and a right paper retreating machine (2) bearing external layer cigarette paper bobbin; the left and right paper retreating machines are respectively controlled by a left paper retreating machine control device (1) and a right paper retreating paper control device (8); the equipment further comprises a double-layered cigarette paper neck (3) arranged on the downstreams of the left paper retreating machine (1) and the right paper retreating machine (2); the double-layered cigarette neck is formed by an internal layer cigarette paper neck (11) and an external layer cigarette paper neck (12) and a horizontal position adjusting rotary button (13); and the cigarette paper conveying equipment also comprises a rotating shaft, namely a plurality of conveying path devices arranged along internal layer cigarette paper (9) and external cigarette paper (10). Simple combination between internal and external cigarette paper is smartly utilized in the cigarette paper conveying equipment, so cigarette with double-layered cigarette paper and without bonding parts between the double layers is provided; and cigarette smoking quality can be enhanced.

The present invention relates to a method for producing a resin for a polyolefin gas permeable membrane. Specifically, the present invention discloses a method for manufacturing a resin for a polyolefin breathable film, wherein the resin contains 5% of low density polyethylene, 8-10% of linear low-density polyethylene, and 23-30% of metallocene linear Low-density polyethylene, 30-40% calcium carbonate and other components; first knead calcium carbonate and antioxidants, mix with other components, and then carry out banburying, rolling, pulverization, extrusion, and granulation in turn, so as to obtain the obtained product. The described resin particles for the polyolefin breathable film. The resin prepared by this method has excellent flow properties and can be used for manufacturing disposable heating sheets.

The invention discloses a tape casting machine, and a method for producing ventilating waterproofing membrane using the same. The tape casting machine comprises a feeding device, a screw-screw cylinder extrusion device, a heating device, a driving device for the screw, a die head, a melt pressure control device, a melt density control device, and a membrane-lip gap control device, wherein the melt pressure control device controls the heating device and the driving device according to the detected melt pressure signals to maintain the melt pressure stable; the melt density control device controls the feeding device according to the detected melt density signals to maintain the melt density stable; and the membrane-lip gap control device controls a membrane-lip gap regulating device according to the detected membrane-lip gap signals to maintain the membrane-lip gap stable. Combining the stable melt pressure, melt density and membrane-lip gap, thin membrane with even thickness extruded by the tape casting machine is ensured.

A fabric, in particular for a paper making machine, includes a plurality of helically wound coil members arranged side by side with respect to each other in an intermeshing manner, such that connecting channels are formed by adjacent intermeshing coil members, a hinge member being introduced into and extending along each connecting channel for interconnecting adjacent coil members, a stuffer channel being formed within each coil member extending along and between two connecting channels associated to a respective coil member, at least a part of the stuffer channels being filled with stuffer members extending longitudinally within the stuffer channels, a stuffer material being provided at least in regions of the fabric for filling spaces formed within the fabric between the coil members, the hinge members and the stuffer members.

The invention discloses a swinging hopper which can segmented adjust the height of sluiceway, reduce edge effect, improve sinter quality and sinter efficiency, with simple structure, small volume, and low cost, for laying bottom material in sinter machine. The invention comprises a body, a rotary sluiceway, and a sluiceway adjuster, wherein the rotary sluiceway is mounted at the middle of the body, the sluiceway adjuster is mounted at the front of the body, and the height of the sluiceway is reduced from middle to two sides.

The invention discloses a preparation method of a PBO composite ultra-high temperature filter material, which comprises the following steps that: a plain blanket is formed through an acupuncture and spunlaced composite process, and then soaked in chemical solvent to prepare the ultra-high temperature filter material, the dust facing surface in the prepared filter material comprises PBO and basaltfibers which are blended, wherein the weight proportion of the PBO fibers is 10 to 15 percent; base cloth comprises PBO long filaments and basalt filaments which are interwoven; and a bottom layer adopts 100 percent basalt fibers. The preparation method of the PBO composite ultra-high temperature filter material effectively reduces the damage of the fibers, improves the strong force of the filtermaterial, meets the need of ultra high temperature flue gas treatment, and is applicable to a bag-type dust collector for ultra high temperature flue gas treatment at above 500DEG C.