Nippon Steel Corporation

Kaneka Corporation

Takasago Thermal Engineering Co., Ltd.

Fuji Electric Co., Ltd.

Kawasaki Jukogyo Kabushiki Kaisha

Toru Yoshida

Yuziro Ueda

Kameo Hosoi

Yujiro Ueda

Hiroshi Fujiwara

Fuminobu Hirose

Michiyasu Honda

Keizi Arima

Youichi Oohara

Shintaro Miura

Takeshi Sato

Kazuyuki Shimizu

Koithiro Nakagawa

Tokuzo Yoshida

Koji Hashimoto

Yasunobu Miyazaki

Yukihisa Kuriyama

Kentaro Yoshida

Jun Fukuzawa

Hiroshi Tsuneishi

Kiyoshi Mori

Kiyotaka Nakayama

Michitaka Kanemoto

Toyo-o Murata

Shinobu Ochikoshi

Hiroshi Narita

Shin-ichi Sanuki

Shigeharu Kawai

Keishi Sato

Katsuyuki Isogami

Tomoaki Kume

Kosaburo Ikenouchi

Masakazu Nakauji

Seiji Hirai

Takamasa Imai

Yuki Hayase

Noriaki Suga

Kyosuke Murakami

Nobuhiro Sakanashi

Katsumi Hachiga

Takehisa Tanaka

A method of producing a polypropylene resin in-mold expanded product, includes: placing polypropylene resin particles obtained from a base material resin having a melting point of 140&#xb0; C. to 150&#xb0; C., the base material resin comprising: a polypropylene resin A comprising 3 weight % to 15 weight % of 1-butene and having a melting point of 130&#xb0; C. to 140&#xb0; C.; and a polypropylene resin B having a melting point of 145&#xb0; C. to 165&#xb0; C., water, and an inorganic gas foaming agent in a pressure-resistant container, forming a mixture, dispersing the polypropylene resin particles while stirring the mixture, obtaining a dispersion liquid, increasing a temperature and a pressure in the pressure-resistant container, releasing the dispersion liquid from the pressure-resistant container into a region having a pressure lower than the pressure in the pressure-resistant container, producing expanded polypropylene resin particles; and filling a mold with the expanded polypropylene resin particles, and then heating the expanded polypropylene resin particles.

Polypropylene resin foamed particles, in-mold foam molded body of polypropylene resin, and method for manufacturing same

A bulk-density measuring device includes a first vessel in which contracted pre-expanded particles are swollen and recovered from contraction in a pressure-reduced state where a vessel internal pressure is lower than atmospheric pressure; a second vessel filled with the pre-expanded particles after being swollen in the first vessel in the pressure-reduced state where a vessel internal pressure is lower than the atmospheric pressure, and into which the pre-expanded particles of a constant volume are collected fractionally; a pressure-reducing unit that adjusts the vessel internal pressures of the first vessel and the second vessel to be lower than the atmospheric pressure; and a scale that measures a weight of the pre-expanded particles filled in the second vessel.

Bulk-density measuring device for pre-expanded particles and method for manufacturing pre-expanded particles

Expanded polypropylene resin particles include a polypropylene resin as a base material resin, wherein the polypropylene resin has a flexural modulus of 750 MPa to 1100 MPa. The flexural modulus and a melting point of the expanded polypropylene resin particles satisfy Expression (1): [Flexural modulus (MPa)]&#x3c;31.19&#xd7;[Melting point (&#xb0; C.)]&#x2212;3500, wherein the melting point of the expanded polypropylene resin particles is a melting point of 141.5&#xb0; C. to 150.0&#xb0; C. in a second differential scanning calorimetry (DSC) curve of a second temperature increase, the second DSC curve being obtained when the expanded polypropylene resin particles are heated from 40&#xb0; C. to 220&#xb0; C. at a temperature increase rate of 10&#xb0; C./min in a first temperature increase, then cooled from 220&#xb0; C. to 40&#xb0; C. at a temperature decrease rate of 10&#xb0; C./min, and heated again from 40&#xb0; C. to 220&#xb0; C. at a temperature increase rate of 10&#xb0; C./min in the second temperature increase.

Polypropylene resin foamed particles and method for producing same

An in-mold foaming molded product having a thin wall part of the present invention contains expanded polypropylene resin particles. The expanded polypropylene resin particles include a polypropylene resin composition that contains an aliphatic diethanolamine fatty acid ester and an aliphatic diethanolamine in a total amount of not less than 0.1 part by weight but not greater than 5 parts by weight with respect to 100 parts by weight of polypropylene resin.

In-mold foam molded body comprising polypropylene resin foam particles and method for producing same

Polypropylene resin foamed particles containing a polypropylene random copolymer having a ratio of a Z-average molecular weight Mz to a number average molecular weight Mn, Mz/Mn, of 20 or more and 300 or less, a melt-flow rate of 5 g/10 minutes or more and 20 g/10 minutes or less, a melt strength of 2.5 cN or less, and a flexural modulus of 600 MPa or more and 1600 MPa or less, and preferably having at least two heat quantity areas of fusion can provide an in-mold foam molded article such as a returnable box having a short molding cycle at in-mold foam molding and beautiful surface properties; and are excellent in moldability even if an inner pressure more than the atmospheric pressure is not provided to the particles or the particles are filled in a mold without compressing them with a gas during the in-mold foam molding.

Polypropylene resin foamed particles, polypropylene resin in-mold foam molded article, and method for producing same

Provided are (i) polyethylene resin foamed particles which are obtained by foaming polyethylene resin particles to be foamed having good productivity and a high expansion ratio and which are suppressed in reduction of cell diameters, and (ii) a polyethylene resin in-mold foam molded article obtained from the polyethylene resin foamed particles which has good surface smoothness while being reduced in surface yellowing. The polyethylene resin foamed particles (i) contain, as a base resin, a polyethylene resin composition containing, in an amount of not less than 1000 ppm to not more than 4000 ppm in total, one or more compounds selected from the group consisting of antioxidants, metal stearates, and inorganic substances and (ii) have Z-average molecular weight of not less than 40&#xd7;10to not more than 70&#xd7;10, an average cell diameter of not less than 180 &#x3bc;m to not more than 450 &#x3bc;m, and an open-cell ratio of not more than 12%.

Polyethylene resin foamed particles, polyethylene resin in-mold foam molded article, and method for producing polyethylene resin foamed particles

A process for producing expanded polyolefin resin particles with use as a foaming agent of water contained in an aqueous dispersion medium. The process includes dispersing polyolefin resin particles together with the aqueous dispersion medium into a closed vessel; heating the polyolefin resin particles up to or above a softening temperature of the polyolefin resin particles and pressurizing the polyolefin resin particles; and releasing the polyolefin resin particles into a zone whose pressure is lower than an internal pressure of the closed vessel. The polyolefin resin particles are composed of a polyolefin resin composition including polyolefin resin, a water-absorbing substance, and a foam nucleating agent.

Process for producing expanded polyolefin resin particles and expanded polyolefin resin particles

A polyethylene resin expanded particle has an expansion ratio of not less than 10 times and not more than 50 times, and in a DSC curve obtained by differential scanning calorimetry (DSC), the polyethylene resin expanded particle (i) shows two melting peaks, the two melting peaks being a low-temperature side melting peak and a high-temperature side melting peak, and (ii) further has a shoulder in a region not less than 100&#xb0; C. and not more than the low-temperature side melting peak temperature, the shoulder having a shoulder ratio which is not less than 0.2% and not more than 3%. This makes it possible to obtain a polyethylene resin expanded particle for producing a polyethylene resin in-mold expansion molded article in which especially an end (edge part) of the polyethylene resin in-mold expansion molded article is excellent in fusion bond level and appearance and which has neither a wrinkle nor a void on a surface thereof, is excellent in surface property (has a beautiful surface), and has a high expansion ratio.

Expanded particle of polyethylene-based resin and in-mold expansion molded article of polyethylene-based resin

Provided are polypropylene resin pre-foamed particles including, as base resin, polypropylene resin that satisfies the following requirements (a) through (c): (a) in cross fractionation chromatography, an amount of components eluted at a temperature of not more than 40&#xb0; C. is not more than 2.0% by weight; (b) a melting point is not less than 100&#xb0; C. but not more than 160&#xb0; C.; and (c) propylene monomer units are present in an amount of not less than 90 mol % but not more than 100 mol %, and olefin units each having a carbon number of 2 or 4 or more are present in an amount of not less than 0 mol % but not more than 10 mol %. The polypropylene resin pre-foamed particles can be molded by in-mold foaming molding at a not high molding heating steam pressure, and a polypropylene resin in-mold foaming molded product excellent in dimensional stability at high temperatures can be prepared from the polypropylene resin pre-foamed particles.

Polypropylene resin pre-foamed particle and method for producing same, and polypropylene resin in-mold foaming molded article

There is provided a tailored blank article for press forming, the article having an excellent formability and comprising multiple different plates of different thickness, which can evade a break of a low strength plate (or low-thickness plate) due to strength rate-determining is provided in press forming. The tailored blank article for press forming, having an excellent formability and comprising two or more kinds of raw plates, continuously welded together, each having a different tensile strength, is characterized in that a ratio (n/n) of a work hardening property value (n) of a higher tensile strength plate and a work hardening property value (n) of a lower tensile strength plate is set to be 0.75 or more and 3.8 or less.

Press-forming tailored blank material excellent in formability and production method therefor

An extruded styrene resin foam obtained by extrusion-foaming of a styrene resin and excellent in environmental compatibility and excellent in flame retardant property and thermal insulating property, characterized in that it contains, as a blowing agent, 100 to 10% by weight of at least one of saturated hydrocarbons having 3 to 5 carbons and 0 to 90% by weight of other blowing agent, based on the total amount of the blowing agent, and contains (A) a halogenated flame retardant and (B) at least one compound selected from the group consisting of phosphorus type flame retardants containing nitrogen atom in a molecule, tetrazole compounds, cyanuric acid and derivatives thereof, isocyanuric acid and derivatives thereof, metal borates, and boron oxides.

Extruded styrene resin foams and methods for producing the same

Extruded styrene resin foam and process for producing the same

A converter pressure control device for use in a converter waste gas disposing device wherein a calculator determines the difference between the pressure in a converter and atmospheric pressure and sets an operating parameter according to the detected difference. A pressure controller generates a control signal in accordance with the operating parameter and the difference in converter pressure and a predetermined value. The control signal is used to operate a damper to control the flow of waste gas through the converter.

Convertor pressure control device in a convertor waste gas disposing

A method and apparatus for directly observing the slag-foaming conditions in a vessel interior. A device for observing the vessel interior light is disposed in a throughhole extending through the side wall of a top-blowing or top- and bottom-blowing converter to reach the vessel interior. The converter operation can be carried out at a high accuracy on the basis of this observation.

Method and apparatus for measuring slag-foam conditions within a

The exhaust-gas treatment system of a sealed-type steel converter is operated at the time of an emergency during blowing by a method which comprises stopping the blowing of oxygen, opening an emergency air suction device connected to the hood while, at the same time, maintaining a converter controlling damper at its degree of opening at the time of stopping of the blowing, disconnecting the skirt of the hood from the converter mouth, and opening the damper to a specific degree of opening. By this simple method, sudden and great pressure drops within the converter are prevented, whereby CO gas of high purity can be efficiently recovered without the occurrence of damage to parts of the system due to abrupt pressure difference and explosion of CO gas.

Method of operation of exhaust-gas treatment system of sealed-type

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Osaka, Japan

Toru Yoshida