RENATUS® PET is a molding material that has excellent flowability. One method of evaluating flowability is the flow length measurement test that uses an injection molding machine. Figure 3-1 shows an example of the dependence of the C3030FA bar flow length on the molding conditions.

RENATUS® PET is a crystalline plastic, and in the case of grades reinforced with glass fiber, the flow inside the cavity causes the glass fibers to be oriented in the direction of flow. As a result, with the direction of flow, the mold shrinkage rate is lower than the direction at a right angle to the flow, and anisotropy is seen in the shrinkage rate, so deformation of molded articles becomes a problem. The shape of the molded articles and design of the gate are important as countermeasures against deformation. Further, in general, the mold shrinkage rate is affected by molding conditions. Figure 3-2 shows an example of mold shrinkage rate.

Recycled materials are affected by their thermal history more than virgin materials, so their molecular weight is low, and mixing in a large amount of such materials is a cause of decreased strength. In particular,
be sure to avoid the reuse of molded articles and runners that have undergone hydrolysis or thermal decomposition.