| 摘要 |
<p>The invention relates to an impervious closure for powdered products, comprising a strip of felt fabric which is approximately 12mm thick. According to the invention, pressure is exerted on the fabric by a support bar which, in turn, is pushed by plate springs against a steel rotor. The aforementioned plate springs are fixed using a locknut and a regulating nut and said nuts can be used be used to adjust the pressure on the rotor and to obtain a suitable pressure.</p> |
