Ishikawajima-harima Jukogyo Kabushiki Kaisha

Kayaba Kogyoka K.k.

Ishikawajima-harima Ju-kogyo K.k.

Sadahiko Shinya

Hisahiko Fukase

Akihiro Nomura

Takayuki Iwasaki

Akira Iwawaki

Masahiro Kuchi

Masao Mikami

Kinshiro Kojima

Takashi Nishii

Riyuji Takahashi

Minoru Yoneda

Eiji Horiuchi

Katsuo Kodama

Kotaro Kawabata

Each of a pair of rolls has a barrel with different diameters axially of the barrel such that sum of the diameters of the barrels is substantially constant and that each of the rolls is bilaterally symmetrical. The rolls themselves have an ability to control workpiece profile and have at least one substantially parallel center portion.

Rolling mill with laterally different velocities

An extrusion head for use in blow molding machines for molding parison having a single layer or wall or a plurality of layers or walls, in which a plunger is slidably interposed between a head body and a core and the plastic material is successively accumulated in an accumulation chamber defined between the extruding end of the plunger, the head body and the core so that the faster the plastic material is introduced into the extrusion head, the faster it is extruded.

Extrusion head for use in blow molding machine

A parison length controller for molding parisons having a predetermined length and a uniform wall thickness distribution over the whole length. A parison lower edge detector is provided for generating the parison lower edge signal when a parison is extruded to a predetermined length, and a parison controller generates the extrusion end signal every time when an extrusion plunger reaches the end of the extrusion stroke. Depending upon whether the parison lower edge signal or the extrusion end signal occurs first, a positive or negative voltage signal of a predetermined magnitude is generated, and the positive and negative voltage signals are accumulated and stored and used as a wall thickness correction signal for forming a parison having a predetermined length.

Method and apparatus for controlling parison dimensions

Growing community of inventors

Yokohama, Japan

Sadahiko Shinya