| 摘要 |
<p>1,123,830. Comminuting apparatus. ONDERZOEKINGSINSTITUUT RESEARCH, N.V. 16 Nov., 1965 [25 Nov., 1964], No. 48645/65. Heading B2A. [Also in Division B5] A strip 7 to be cut into chips is fed at an acute angle to a bed knife 10 having an undulating cutting edge which meshes with the undulating cutting edges of knives 2 carried by a rotor 1, the strip being displaced between successive cuts such that the components of the displacement along, and transverse to, the main direction of the cutting edges are equal to half the length of an undulation and less than the depth of an undulation respectively. The angle of feed of the strip is between 25‹ and 35‹, preferably 30‹. The transverse component of the displacement of the strip between successive cuts is preferably 55% to 58% of the depth of an undulation. The undulations preferably each have straight sides together forming an angle of 60‹. The extreme parts of the undulations that are nearest to the feed path of the strip have a larger radius of curvature than the extreme parts that are furthest away therefrom, the ratio between the radii of curvature preferably being 2.5 to 1. The strip may be of synthetic thermoplastic polymerisation or polycondensation product.</p> |
