摘要:
A packaging polyester material comprising a polyethylene terephthalate component and a component of polyethylene isophthalate copolymerized with 5 to 60 mole % of an aliphatic hydroxycarboxylic acid having up to 8 carbon atoms. This packaging material is excellent in the resistance to the permeation of gases.
摘要:
A material for forming a hollow-molded body, which comprises a polyamide comprising hexamethylene isophthalamide units as the main recurring units. A hollow-molded body having an excellent gas barrier property can be obtained by using this polyamide molding material alone or in combination with polyethylene terephthalate.
摘要:
With a rack-and-pinion mechanism, an impact force is absorbed and reduction in assembling performance is suppressed. An annular fitting groove (51) that extends in the circumferential direction of a rack guide (41) is formed in an outer peripheral face (41a) of the rack guide (41), and an O-ring (52) is fitted in the fitting groove (51) in a state in which the axial movement of the O-ring (52) is restricted. A communication groove (61) that provides communication between an internal space (55), defined by the fitting groove (51) and the O-ring (52), and the outside of the rack guide (41) is formed in the rack guide (41).
摘要:
A method of manufacturing a rack guide base body wherein a cavity (40) is formed which has a pair of semicylindrical convex surfaces (44a and 44b) and a pair of flat surfaces (45) each located between the semicylindrical convex surfaces (44a and 44b), and has a recessed surface (41) located on one axial end portion side inwardly of the semicylindrical convex surfaces (44a and 44b) and the flat surfaces (45) and a cylindrical surface (42) located on the other axial end portion side inwardly of the semicylindrical convex surfaces (44a and 44b) and the flat surfaces (45); a hollow portion (9c) is formed for allowing the cavity (40) to communicate with a hollow portion (10c) at one flat surface (45) and with a hollow portion (8c) at the other flat surface (45); a rack guide base body (50) is die cast by forcing molten metal of aluminum from the hollow portion (10c) into the cavity (40); and runners (56) integrally joined to flat surfaces (55) of the rack guide base body (50) formed by the respective flat surfaces (45) are cut off.
摘要:
Prior to engaging a male screw formed on the outer circumference of a second member with a female screw formed on the inner circumference of a hole in a first member, protruding parts which protrude outward in the radial direction and are positioned at one end side of the male screw in the axial direction are formed in a plurality of regions which are separated from each other in the circumferential direction on the outer circumference of the second member on which the male screw is formed. The male screw is then engaged with the female screw from the other end side of the male screw in the axial direction. The torque required to rotate the male screw engaged with the female screw in the loosening direction is set so as to be greater in a state where the protruding parts are interposed between the male screw and the female screw than in a state where the protruding parts are not so interposed.
摘要:
This invention provides a composite reverse osmosis membrane having a polyamide type skin layer whose average surface roughness is at least 55 nm, and the polyamide type skin layer comprises the reaction product of a compound having amino groups and polyfunctional acid halide compound having acid halide groups. The composite reverse osmosis membrane of this invention is superior in salt rejection and water permeability. A polymer film is formed on a supporting film by contacting a solution containing e.g., m-phenylenediamine with a porous polysulfone supporting film so as to form a layer of the solution on the supporting film, then contacting the film with a solution of trimesic acid chloride and holding the film in a hot air dryer so that a polymer film is formed on the supporting film. The surface of the polyamide type skin layer can also be treated with quaternary ammonium salt and coated with a crosslinked layer of an organic polymer having positively-charged groups. Raw liquid is transmitted from a raw liquid tank to a membrane module for the first stage through a first transmission pump, and the first stage of reverse osmosis treatment is carried out. The composite reverse osmosis membrane coated with the crosslinked layer is used when another reverse osmosis treatment is carried out by using another membrane module for the second stage.
摘要:
Disclosed is a method for producing a composite reverse osmosis membrane comprising the steps of coating a porous support with (A) a solution containing a compound having at least two reactive amino groups per molecule and bringing (B) a solution containing a polyfunctional acid halide into contact with the solution (A) to induce crosslinking to form a crosslinked polyamide skin layer, in which the crosslinking is carried out in the presence of a substance having a solubility parameter of 8 to 14 (cal/cm.sup.3).sup.1/2. The resulting composite reverse osmosis membrane exhibits high salt rejection and high water permeability.
摘要翻译:公开了一种复合反渗透膜的制造方法,其特征在于,包括以下步骤:(A)含有每分子具有至少2个反应性氨基的化合物的溶液,使(B)含有多官能酰卤的溶液 与溶液(A)接触以诱导交联以形成交联的聚酰胺表层,其中交联在溶解度参数为8-14(cal / cm 3)+ E的物质的存在下进行, 2 + EE。 所得到的复合反渗透膜具有高的耐盐析和高透水性。
摘要:
This invention provides a composite reverse osmosis membrane having a polyamide type skin layer whose average surface roughness is at least 55 nm, and the polyamide type skin layer comprises the reaction product of a compound having amino groups and polyfunctional acid halide compound having acid halide groups. The composite reverse osmosis membrane of this invention is superior in salt rejection and water permeability. A polymer film is formed on a supporting film by contacting a solution containing e.g., m-phenylenediamine with a porous polysulfone supporting film so as to form a layer of the solution on the supporting film, then contacting the film with a solution of trimesic acid chloride and holding the film in a hot air dryer so that a polymer film is formed on the supporting film. The surface of the polyamide type skin layer can also be treated with quaternary ammonium salt and coated with a crosslinked layer of an organic polymer having positively-charged groups. Raw liquid is transmitted from a raw liquid tank to a membrane module for the first stage through a first transmission pump, and the first stage of reverse osmosis treatment is carried out. The composite reverse osmosis membrane coated with the crosslinked layer is used when another reverse osmosis treatment is carried out by using another membrane module for the second stage.
摘要:
Disclosed is an apparatus for treating the surface of a material in a gas plasma generated by microwave discharge. The apparatus comprises a microwave generator, a waveguide for transmitting the microwave generated from the microwave generator, a closed vessel housing a material to be treated, means for introducing a gas into the closed vessel, means for withdrawing the gas from the closed vessel, an antenna means inserted at least partially into the closed vessel, said antenna means serving to pick up the microwave from the waveguide and to deliver said microwave into the closed vessel for producing a gas plasma, and a cylindrical body formed of a microwave-transmitting material, mounted to the closed vessel in an air-tight fashion, and surrounding the antenna means at the portion inserted into the closed vessel.
摘要:
The invention relates to an optical-electrical wiring board (2) and an optical module (1). The optical-electrical wiring board (2) includes a substrate (8), a dielectric layer (11), first conductive layers (16a) and second conductive layers (16b). The dielectric layer (11) includes a first region (B) and a second region (C). The first region (B) constitutes a plurality of light transmission portions (11B). The second region (C) has a plurality of pairs of conductive layers each having an overlap portion (10) in which one of the plurality of second conductive layers (16b) and one of the plurality of first conductive layers (16a) overlap each other when seen through in a laminated direction (a) of the dielectric layer (11) and the substrate (8).