摘要:
Disclosed is a method and apparatus for producing a flexible tube of a thermoplastic resin having poor melt flowability, the tube having an intrinsic viscosity of at least 3.5 dl/g, a tensile strength at break of 150 kg/cm.sup.2, a breaking time at hot internal pressure creep of at least 200 hours, an outer diameter of 50 mm.phi. or less, and a ratio of the outer diameter to the wall thickness of 40 or less.This tube can be prepared from a thermoplastic resin having poor melt flowability by melting the thermoplastic resin having poor melt flowability in a screw extruder, and melt-extruding the molten thermoplastic resin from a tube die having an L/D of at least 5 provided at a mandrel rotatable with the rotation of the screw.
摘要:
An extruded stretched filament of ultra-high-molecular-weight polyethylene has an intrinsic viscosity [.eta.] of at least 3.5 dl/g, a tensile strength at break of 10 kg/mm.sup.2, a draw ratio of at least 3, a C axis orientation degree of at least 0.9, an outer diameter of 0.1 to 10 mm.phi., and a substantially indefinite length, and a method and apparatus for producing the same.
摘要翻译:超高分子量聚乙烯的挤出拉伸丝的特性粘度η至少为3.5dl / g,断裂拉伸强度为10kg / mm 2,拉伸比至少为3,C轴 取向度至少为0.9,外径为0.1〜10mmφ,并且基本上不定长度,以及其制造方法和装置。
摘要:
A method of manufacture of an ultra-high molecular weight polyethylene thin-wall pipe which is uniform in thickness and free from a folded mark. The ultra-high molecular weight polyethylene thin-wall pipe is manufactured by supplying ultra-high molecular weight polyethylene into and melting and kneading, continuously extruding the molten substance of the ultra-high molecular weight polyethylene from a die connected to a screw of the screw extruder to form a cylindrical roughly shaped article, and diametrically expanding the cylindrical roughly extruded article by means of a tapered core and taking up.
摘要:
An apparatus for melting metals comprises a hearth for melting a metal raw material, a mold for forming an ingot by cooling the molten metal therein, the mold having a bottom, and a base unit for pulling down the ingot and provided at the bottom of the mold. The base unit has a surface provided with a concave portion at an optional location, and the surface of the base unit surrounding the concave portion is inclined toward the concave portion.
摘要:
The present invention provides an electron-beam furnace and a melting method that, in producing an ingot by melting a metal with an electron beam, can suppress the contamination of new impurities in the ingot production, are less likely to again result in inclusion of once evaporated impurities from a molten metal pool within a hearth or a mold, and can be improved in utilization rate. The electron-beam furnace for melting a refractory metal includes a feeder unit for raw materials, a melting unit for raw materials, which is connected to the feeder unit for raw materials and, at the same time, is defined by a furnace wall and a ceiling wall, and includes at least a hearth, a water-cooled mold, and an electron gun, and an evacuation unit for exhaust gas connected to the melting unit for raw materials. In this electron beam furnace, at least one of the furnace wall and the ceiling wall is lined with titanium or stainless steel, and in addition, plural fin-shaped members formed of titanium or stainless steel are provided at the ceiling wall. A lining, which can be attached and detached, is provided on the inner face of the electron beam furnace.
摘要:
A method of producing an inflation film which includes the steps of melting an ultra-high-molecular-weight polyolefin in an extruder, extruding the molten polyolefin from a screw die, and blowing a gas into a molten tubular film formed by extrusion. An apparatus for producing an inflation film which includes an extruder provided with a first screw, and a screw die having an L/D of at least 5 and is provided at the end of the extruder, wherein the screw die includes a second screw which rotates independently of the first screw, a mandrel coupled to the end of the second screw and rotates together with the second screw, an outer tube die in which the mandrel is inserted, and a gas passage extending in the second screw and in the mandrel. An inflation film is composed of an ultra-high-molecular-weight polyolefin having a tensile strength at break of greater than 1660 kg/cm.sup.2 in a machine direction and greater than 1600 kg/cm.sup.2 in a transverse direction, an impact strength of greater than 9500 kg.multidot.cm/cm, a thickness of from 10 to 1000 .mu.m, an R-value of not larger than 10 .mu.m and an intrinsic viscosity (.eta.) of at least 7 dl/g.
摘要翻译:一种膨胀膜的制造方法,其包括在挤出机中熔融超高分子量聚烯烃的步骤,从螺杆模头挤出熔融聚烯烃,并将气体吹入通过挤出形成的熔融管状膜中。 一种吹塑薄膜的制造装置,其特征在于,具备设置有第一螺杆的挤出机和L / D为5以上的螺杆,设在所述挤出机的端部,所述螺杆具有旋转的第二螺杆 独立于第一螺杆,与第二螺杆的端部相连的心轴与第二螺杆一起旋转,插入心轴的外管模,以及在第二螺钉和心轴中延伸的气体通道。 膨胀膜由机械方向的断裂强度大于1660kg / cm 2,横向大于1600kg / cm 2的超高分子量聚烯烃构成,冲击强度大于 9500kgxcm / cm,厚度为10〜1000μm,R值为10μm以下,特性粘度(η)为7dl / g以上。
摘要:
A titanium slab is appropriate for hot rolling, is produced by electron beam melting furnace, has superior linearity so that it can be fed into a hot rolling machine without performing breaking down process or other subsequent correcting process after production, and has good structure having no cracks at the corner parts. A process for production thereof is also provided. The titanium slab is directly produced by a mold of an electron beam melting furnace, and has the deformation of not more than 5 mm for the thickness direction versus the longitudinal direction and deformation of not more than 2.5 mm for the width direction versus the longitudinal direction, both per a length of 1000 mm of the slab. The process for production of this titanium slab for hot rolling has a step of using an electron beam melting furnace in which its rectangular mold has mold walls of a long side and mold walls of a short side, and a step of pouring molten metal from one of the mold walls of a short side. Furthermore, a mold having chamfered parts at the corner parts can be used in the process.
摘要:
A titanium slab is appropriate for hot rolling, is produced by electron beam melting furnace, has superior linearity so that it can be fed into a hot rolling machine without performing breaking down process or other subsequent correcting process after production, and has good structure having no cracks at the corner parts. A process for production thereof is also provided. The titanium slab is directly produced by a mold of an electron beam melting furnace, and has the deformation of not more than 5 mm for the thickness direction versus the longitudinal direction and deformation of not more than 2.5 mm for the width direction versus the longitudinal direction, both per a length of 1000 mm of the slab. The process for production of this titanium slab for hot rolling has a step of using an electron beam melting furnace in which its rectangular mold has mold walls of a long side and mold walls of a short side, and a step of pouring molten metal from one of the mold walls of a short side. Furthermore, a mold having chamfered parts at the corner parts can be used in the process.
摘要:
The present invention provides an electron-beam furnace and a melting method that, in producing an ingot by melting a metal with an electron beam, can suppress the contamination of new impurities in the ingot production, are less likely to again result in inclusion of once evaporated impurities from a molten metal pool within a hearth or a mold, and can be improved in utilization rate. The electron-beam furnace for melting a refractory metal includes a feeder unit for raw materials, a melting unit for raw materials, which is connected to the feeder unit for raw materials and, at the same time, is defined by a furnace wall and a ceiling wall, and includes at least a hearth, a water-cooled mold, and an electron gun, and an evacuation unit for exhaust gas connected to the melting unit for raw materials. In this electron beam furnace, at least one of the furnace wall and the ceiling wall is lined with titanium or stainless steel, and in addition, plural fin-shaped members formed of titanium or stainless steel are provided at the ceiling wall. A lining, which can be attached and detached, is provided on the inner face of the electron beam furnace.
摘要:
A process for producing a titanium material with excellent corrosion resistance, which comprises first applying a degree of cold working of 10% or more of the total working reduction while causing an oil to exist on the surface of the titanium material during cold working thereof and then subjecting the titanium material to in-situ heat treatment at a temperature of 300.degree. C. or higher, thereby forming a layer with excellent corrosion resistance containing at least one of Ti.sub.2 N, TiC and Ti(CN) on the titanium material surface.