Piston for plastic bag, has integrated spreader roll at outer wall e.g. protection pipe, where piston has different dimensions, made of different materials and pressurized at front and back side with pressure
摘要
<p>The piston has an integrated spreader roll at an outer wall e.g. protection pipe, where the piston has different dimensions and made of different materials. The piston is pressurized at front and back side with pressure.</p>
