The pre-steaming bin and reaction chamber are among the key equipment. They are mainly used to control the pre-steaming or reaction period and temperature, saturate and soften the materials with water, and facilitate full reaction at a certain temperature, so as to make full preparation for the extrusion & dipping and refining in the following process.

The pre-steaming bin and reaction chamber mainly comprise the cone bin body on the top and multiple parallel discharge screw axes at the bottom. After being washed or dipped with chemicals in the impregnator, the wood chips (wood thread) fall into the bin from the feeding hole on the top of the bin (the pre-steaming bin shall reach a certain temperature via the introduction of steam), and then are output layer by layer by the discharge helix axes at the bottom of the bin after staying in the bin for a certain period of time. The helix axes with pitch-varying helix structure can ensure a constant pre-steaming and reaction time of the material in the bin, and a uniform and full reaction of the wood chip moisture and pulp.