Seed tapes contg. accurately spaced seeds

摘要

Seed tapes are made by placing single seeds (19) by means of a dosing arrangement (4) into locally delimited regions (21) on a base layer (50) and covering the base layer (50) with a covering layer (3). Also claimed is equipment for carrying out the process in a continuous conveying plane (T) and forwarding (24) the covered tape to a second zone where the layers are mechanically bonded. Pref. tapes are made of biodegradable material, esp. needle punched non-woven of a 50/50 mixt. of flax/cotton or hemp/cotton or blends including viscose. A spacing layer (2) with accurate perforations (21) is placed on a base layer (50). Single seeds are deposited by a swinging dosing device (4) which draws in seeds pneumatically and puts them into the pockets with a reciprocating plunger (23). The cover layer (3) is compacted by pressure bands (24) and needle punched (5) in the spaces between the seeds to the other layers (1,2). The tape is then cut longitudinally (9) and transversely (11) as required. The draw-off rollers (6,12) have grooves to avoid crushing the seeds.