This paper is concerned with the development of multi-action die or multiple sliding die for the forming process of
serrated sheets. Serrated sheets is used as a toothed or serrated seal for securing together overlapping portions of steel or
plastic strapping ligature and have been produced conventionally in several methods such as rolling and indentation.
Recently, longitudinally oriented thermoplastic materials have been widely used in the strapping industry, while such
materials are quite slippery. Provided projections on a seal biting into the strap should overcome the slipperiness and also
the tooth configuration must be closely controlled to avoid too much transverse penetration of the strap which could result
in the shredding of the strap when it is placed under tension. The seal includes a central portion with a plurality of teeth
which bite into one strap portion and a pair of reversely bent legs with a plurality of teeth which bite into the other strap
portion. Forming processes applicable for serrated sheets have reviewed in qualitative sense to find possibility in terms of
applicability of one of existing processes to the serrated sheet forming process. Existing seal products have been analyzed
with enlarged picture of strap contacting surface of the seal by microscope. Based on the analyses of the existing forming
processes and seal products, a new forming process is proposed for serrated sheets. The proposed process requires a multislide
die which enables inclined indentation or cut-in into the seal material as well as scratching processes sequentially in
a single action press.