Injection moulding thermoplastics articles of non-uniform hardness - in which temp. during at least half of the moulding is above, and in remainder below, vitrifying point

摘要

Pref. the difference between the two temps. is at least 30 degrees C. Pref. the temp. during half of moulding is 20 degrees above and in the remainder 10 degrees below vitrifying point. Pref. thermoplastics are polyesters, polyamides and terephthalic acid polyesters.