HOME > Naigai Rubber Industry Technology Naigai Rubber Technology TECHNIQUE Naigai Rubber Industry, which celebrated its 100th anniversary in 2013, has solved various difficult problems with its excellent technology and has developed new products. Our continuous research and development cultivated over many years and the pursuit of quality through an advanced management system have attracted tremendous support from many customers. Transition of sponge manufacturing technology Immediately before the end of the war, the original sponge rubber was sucking water, but Ikuta, the chief engineer of our company at that time, was requested by the military to make the same rubber used for American bombers. Over the years, he invented and developed "closed cell sponge rubber," a rubber that does not absorb water. Light, elastic and vibration-proof. It is now the core technology of our products such as daily necessities and industrial products. Technological development of softball baseball (hollow ball) The production of softball baseball started in 1947 (Showa 22) shortly after the war. A for general use, B for junior high school students, C for elementary school students, and D for lower grades of elementary school were sent out in sequence. The semi-rigid baseball ball "Top Ball" released in 1949 was immediately certified as an official ball of the All Japan University Softball Baseball Championship and continues to this day. In 1993 (Heisei 5), we developed a special ball for the new sport "Teeball", which was born as a batting game that can be enjoyed safely. Furthermore, in 2006 (18th year of the same year), under the supervision of the Japan Professional Baseball Players Association, the catch ball exclusive ball "Yu Ball" was jointly developed and released. Soft, seamed balls have been well received for teaching children how to hold them properly. Softball technology development 19世紀後半にアメリカで生まれ、1921（大正10）年に日本で初めて紹介されたソフトボール競技。当社では47（昭和22）年の軟式野球ボールに続き、競技人口の増加を見据えて、50（同25）年にソフトボールの生産を始めた。　当初、芯の製作は外部に発注しており、コルク粒のバインダーにはエマルジョン系の接着剤を使用していた。しかし、84（同59）年に内作化プロジェクトが発足し、社内生産に切り替えるに当たり、より強度で変形しない芯に改良することに成功した。国内シェアは50％以上。検定球（1〜3号）のほか、ヘビーウェイト仕様トレーニングボール、やわらかタイプ、学校体育ソフトボールもあります。 EVA 樹脂による漁業用浮子（エフロート）の開発 1953（昭和28）年に開発した硬質スポンジを使って漁網用浮子の生産を開始。従来の木製やガラス球製と比べ、浮力が大きく、耐久年数も長いことから、合成繊維魚網の必需品として国内はもとより、世界各国へ輸出された。　79（同54）年には、住友化学工業㈱と共同で業界初のエチレン− 酢酸ビニル共重合樹脂「E V A（Ethylene-Vinyl Acetate」を素材にした「エフロート」を開発。EVAはポリエチレンよりも軟らかく弾力があり、低温下でも硬くなりにくいのが特徴だ。エフロートは鮭鱒流し網にはじまり、まき網・定置網用、海苔・平型などバリエーションを展開し、EVA製浮子のパイオニアとして安定して市場へ製品を供給しています。 ゴム膜の技術開発 It is a dish-shaped rubber film used inside the gas meter, and is known as the "gas film" within the company and with business partners. Since ultra-thin (thickness 0.15 mm or more), high precision, and high durability are required, considerable technical capabilities are required for manufacturing. Originally it was a quadrangle, but the tension was concentrated on the corners and the strength could not be maintained, so it gradually changed to a round shape from the latter half of 1970 (Showa 45). Initially, the depth of the dishes became uneven, and it took 10 years for the quality to stabilize. Currently, it is widely used in measuring instruments such as city gas and propane gas meters nationwide. Development of accelerometer Since the Great Hanshin-Awaji Earthquake of 1995 (Heisei 7) was a direct earthquake and caused vertical shaking, the seismic detector installed in the household gas meter that detects the horizontal shaking did not operate immediately. Based on this lesson, the "3-axis capacitive accelerometer" was developed in 1997 based on the technology of Wako Co., Ltd. The acceleration in the three-dimensional space represented by the X-axis, Y-axis, and Z-axis is detected by separating it into the acceleration components of each axis. The seismic detector using this sensor automatically operates when it detects a seismic motion (P wave <pitching> or S wave <rolling>) above the set acceleration (gal) and turns on the electric circuit. When combined with a control circuit such as an elevator, it is possible to automatically control operation stoppages and alarms when an earthquake occurs. In 2008 (20), the installation of earthquake detectors in elevators was obligatory, and the number of units sold increased sharply, surpassing 100,000 at the end of March 2013. In particular, P-wave seismic detectors boast a domestic market share of approximately 70%. A site dedicated to sports equipment of Naigai Rubber Industry that supports the sports scene Headquarters factory 〒674-0084 2050 Nishioka, Uozumi-cho, Akashi-shi TEL (078) 944-0650 FAX (078) 942-0284 Sales Department (Kobe) 〒650-0023 4-1-10 Sakaemachidori, Chuo-ku, Kobe Shinwa Building 7th floor TEL (078) 360-1361 FAX (078) 360-1371 Sales Department (Fukuoka) 〒812-0016 4-9-7 Hakataekiminami, Hakata-ku, Fukuoka Chateau Izumi 1st floor TEL (092) 472-3885 FAX (092) 472-3862 Sales Department (Tokyo) 〒105-0004 4-5-15 Shinbashi, Minato-ku, Tokyo Shimbashi Shinwa Building 4th floor TEL (03) 3459-6868 FAX (03) 3459-6869 * For inquiries regarding sensors, please contact Tokyo. Sales Department (Nagoya) 〒453-0056 1-40-1 Sunada-cho, Nakamura-ku, Nagoya TEL (052) 412-3218 FAX (052) 412-3473 * For inquiries regarding industrial supplies and footwear, please contact Kobe and Tokyo. Overseas base Nan'an Inner and Foreigner Co., Ltd. Nan'an City, Fujian Province TEL (0595) 86905070 FAX (0595) 86906070 Naigai Rubber Philippines Co., Ltd. Lot4-B First Philipin Industrial Park-SEPZ Brgy. Anastacia, Sto . Tomas Batangas Philippine TEL (043) 405-5378 FAX (043) 405-5378 site map Environmental policy privacy policy Copyright (C) Naigai Rubber Industry Co., Ltd. All Rights Reserved.