Smart Molding International 1-2020

technology 22 smart_molding interna ti onal 1/2020 Lightweight technologies The well-known foam injection moulding process is ideal for manufac- turing lightweight products. Yizumi de- veloped a new screw design to increase the process to higher recovery rates and be tt er performance for glass fi ber fi lled polymers. In addi ti on, the price of the equipment decreases significant. In Germany Yizumi is part of a standardi- sation team which is defining a new standard for the produc ti on based on foam injec ti on moulding. Meanwhile also the disadvantage of foam injec- ti on moulding – poor surface quality – is solved. Based on a thin ceramic layer in the cavity walls of the tool you get a perfect surface for a low amount of investment cost. Physical foam injection moulding related technologies like Water Injec- ti on Technology (WIT) or Gas Injec ti on Technology (GIT) are also developed and o ff ered to customers. In this spe- cial case we work close together with our network partner PME fl uidtec in Germany. Based on the WIT process for example, you produce in thick wall areas of plas ti c parts cavi ti es or hol- low spaces to lower the weight of the fi nal part. In addi ti on, you decrease the cooling ti me pre tt y much and prevent shrinkage. Lightweight design o ft en means to replace a part which is designed on a metal material base by a plas ti c part. Consequently, you have to choose for the final design of the part a poly- mer with high mechanical proper ti es: You have to process fi ber reinforced plastics. Together with our German network partner C4PP we developed the Direct Injection Moulding (DIM) process. The advantage of the DIM process is the signi fi cant reduc ti on of material cost down to 50% of the original mar- ket cost. An injection moulding ma- chine is equipped with a special mix- ing screw. In the area of the metering sec ti on of the plas ti fi ca ti on unit a fi ber cu tti ng and stu ffi ng device is connect- ed to the injec ti on moulding machine. The fi ber length can be varied by the cu tti ng device and the amount of fi bres can be changed by changing the speed of the unit and/or can be changed by the number of rovings which are fed into the device. As a result you do not need to pur- chase high priced fi ber fi lled plas ti cs anymore. You purchase cheap stan- dard resins and cheap fi ber roving and The pressure to reduce emissions and the wish of people concerning mobility leads to new concepts in automo ti ve. Talking about electric cars, e-scooter or other ways for urban transports, light weight design is one of the most important headlines. The look and feel of thereby used polymers have to have a perfect surface and high-quality design. From these statements the importance of the future topics are related for the plas ti cs machinery industry: lightweight design, combina ti on technology, plas ti cs Industry 4.0, 3D prin ti ng. These headlines have likewise strategic importance to the product development of Yizumi. Yizumi novelties based on trends in automotive and urban mobility