Abstract: The distinguishing feature of the invention resides in the fact that each tine of the rake bar is configured in the cross-section as an isosceles triangle with a working edge defined by a vertex of an angle between the lateral sides in the direction of rotation of the reel, and in the zone of the vertex, the working edge of the tine is defined by the base of the isosceles triangle. A portion of each tine between its vertex a fastener member for attaching the tine to the bat blade is curvilinear and has a longitudinal slot.

Abstract: Injection molding apparatus is disclosed including a two cavity split-mold with a flow passage between the cavities. The sprue channel is heated as is the flow passage between the mold cavities. The apparatus has a rotatable core with a longitudinal recess. The flow passage has replaceable inserts for varying the size of the flow passage.

Abstract: An injection molding process is adaptable to various branches of industry for the production of high-strength textured articles from thermoplastic materials. The process consists of successively filling the intercommunicating cavities of a split mold with a polymer melt, holding the latter under pressure, and cooling the melt. As the hot melt is held under pressure and cooled, it is forced through the mold cavities at a temperature not exceeding the polymer melting or yield temperature by not more than 40.degree. to 50.degree. C., and under a pressure of 900 to 3,000 kgf/cm.sup.2. The mold surfaces are cooled within the temperature range starting from -20.degree. C. and ending with the polymer initial melting or yield temperature. Mounted in the split mold, having half-molds with a die and plunger, are conventional heaters arranged at the inlet and outlet openings in isolation from the remaining part of each half-mold.

Abstract: A method for extrusion of a highly viscous thermosetting or a thermoplastic material comprising extrusion of said material in the presence of substances diminishing external friction of the melt, at a ratio between internal and external friction values of the material melt within the range of from 1.5 to 4.0; the thermosetting material melt viscosity being ranged from 50.times.10.sup.6 to 300.times.10.sup.6 poises, while the thermoplastic material melt index being varied from 0.01 to 0.1 g/10 min.The ratio between internal and external friction values of the material melt is maintained within the above-specified range by way of incorporation, into the starting thermosetting or thermoplastic material, of certain compounds. For thermosetting materials, use is made of, e.g. zinc dialkyldithiophosphate, and for thermoplastic materials barium sulphonate is used as such a compound.