| 摘要 |
<p>A ring member (10) of reinforced plastic construction for a wrapping machine, said ring member comprising a box-like portion (15) having a plurality of reinforcing fibre layers so arranged that the fibre directions are varied so as to achieve a sufficient strength and flexural rigidity, and a core part (17) of cellular plastic. The walls (14) of the box-like portion may deviate from a vertical or horizontal plane, and the wall may be provided with one or more flanges (16) oriented in a direction outward from the ring member or toward the centre of the ring member. The box-like portion is preferably made of carbon fibre and epoxy resin, and the core part inside the box-like portion is of foamed polyurethane plastic. Inside the reinforcing plastic layers of the box-like portion it is also possible to laminate a steel reinforcement (18), to which a wrapping film feed apparatus (20) and possibly support rollers are fastened. The ring member (10) is manufactured by laminating a box-like portion consisting of a plurality of reinforcing fibre layers upon a core part of cellular plastic.</p> |
