hans and martha had a daughter, lotte, on august 6, 1923, whom would later run the company in future generations together with her husband, otto buchner. additional doll models were created under her artistic influence. it was during the end of the 1950s that lotte led the company into plastic manufacturing, the old puppets were redesigned in hard plastic in a blow-moulding process. the völk factory was also installed with a rotational moulding technique, something that made the company a modern polymer processor.