Heat plate unit and double facer for fabricating double-faced corrugated fiberboard

Abstract

A double facer that fabricates a corrugated fiberboard and that includes heat plate units having thin walls aims at improving the heat conductive efficiency to fiberboard sheets in order to enhance responsibility to the setting temperature and concurrently avoiding thermal deformation of the heat plates due to a difference in temperature between the top surface and the bottom surface. The heat plate unit for fabricating a double-faced corrugated fiberboard included in a double facer that fabricates a double-faced corrugated fiberboards by gluing a single-faced corrugated fiberboard in a swath form and a linerboard together, the heat plate, being horizontally disposed and having a top surface on which the single-faced corrugated fiberboard in a swath form and the linerboard overlapping and being glued together travels, includes: a rib, disposed on a bottom surface of a heat plate, extending in a width direction of the heat plate, being coupled to the heat plateto form an integrated body, and being capable of thermal expansion; and temperature controlling means that controls a temperature of the heat plateand a temperature of the ribindependently of each other.