HOMENunobiki Manufacturing’s RootsScreens for Sugar Production Established Nunobiki Manufacturing

Screens for Sugar Production Established Nunobiki Manufacturing

Proprietary P-0 high-speed automatic punching press

The next big, unexpected turning point came in 1953.

A sugar-refining company approached Nunobiki Manufacturing about wide perforated screens for sugar-refining centrifuges. These screens were all imported, because no Japanese company at the time had the know-how to process them. So Nunobiki Manufacturing poured its efforts into devising and designing presses to produce the screens. Assembly and adjustment was conducted within the company. A leveler was also produced to reduce the warps, and Nunobiki Manufacturing began processing wide perforated screens to meet the client’s needs.


Nunobiki Manufacturing’s efforts and achievement in producing these screens were recognized, and orders for brass perforated screens for centrifuges, which are used in sugar refining, began fluttering in from a large trading firm for export to Taiwan and other countries in South-east Asia.

At the time, Japan had little foreign exchange and few resources, so these high, value-added perforated screens contributed to economic growth.


Perforated screen
 Hole: 0.5mm, pitch: 1.1mm
 (Stainless steel, brass, brass)

The joint of a screen for sugar refining, which uses centrifugal force

The perforated screens for sugar refining have hardly changed since those times. Using the conventional methods at the time, align-and-press punching could not produce high-density screens (0.5mm in size with a pitch of 1.1mm), so it became standard to perforate a one-meter-wide screen in one punch with high precision and send it through. Foremost and upmost, the new process required advanced die making technology, and with it Nunobiki Manufacturing was able to develop and produce all their detailed dies themselves.

The salesmen would lug these perforated sheets onto the trains when making their sales calls. They began by approaching refineries in Nagoya, Kobe, and Kyushu. Eventually all the domestically manufactured perforated screens used at refineries around the country were produced by Nunobiki Manufacturing, and it took as long as three months to fill orders. These screens currently hold more than 80 percent of the domestic market share of perforated screens for sugar refining, sustaining lasting customer loyalty.