小野産業株式会社

Excellent mold transcription

Excellent mold transcription Injection molding is a molding method where molten resin is pressed onto the inner surface of the mold cavity thus the cavity configuration is transcribed into the molded plastics. Conventional injection molding had a limitation where the resin starts being solidified as soon as it is filled into the cavity, resulting in incomplete transcription and poor appearance of the plastic surface. The patented technology of RHCM controls surface temperature of the mold cavity to be maintained above the resin heat distortion temperature just in time to the point where its filling process is completed, resulting in superior finish of the plastic surface.

Reduction of filling pressure

In conventional injection molding, resin starts being solidified as soon as it touches the mold surface, and accordingly, the filling channel for the resin becomes narrower and narrower, causing necessity for higher and higher filling pressure. In the patented technology of RHCM, solid layer of the resin does not start developping until its filling is completed. Thus, its filling pressure becomes lower.

Relaxation of polymer orientation

When a polymer alloy or a co-polymer containing elastomer (such as ABS resin or TPO compound) is injection molded, the elastomer phase elongates during its filling process. In conventional injection molding, the elastomer phase orients towards flow direction while cooling and solidifing take place at its stretched structure. When the molds are opened and the pressure drops, the elongated elastomer phase trys to return to its genuin structure (relaxation) by shrinking, resulting in an uneven surface of the molded plastics. In the patented technology of RHCM, its filling process allows the elongated elastomer phase to return to its genuine structure (relaxation) within the press before the molds are opened. Accordingly, an even and superior plastic surface is produced.