Abstract
We developed a pulp-molded insulation cup whose structure is made of multiple layers of enclosed foaming agent layer and high-density pulp layers outside. Typical futures of new developed cup are as follows.
1）Even for deep and steep cups with side wall angel of nearly 90 degree, it can be made up to a smoother surface by pressing and drying process of pulp which is molded by using elastic core.
2）Due to its exhaustion routes leads to inside of the core, an excellent surface without any vent holes remained can be obtained.
3）The insulation layer is formed by forming agent, and it facilitates the flexible formation of inner wall structure, such as stacking rib and so on.
Moreover, the improvement of tensile property of the pulp by controlling its water content resulted in the control of curling dimension, and we successfully obtained a pulp-molded cup with a curling opening portion for the first time.
