the invention relates to a storage head for a blow moulding machine for discontinuous manufacture of multi - layer co - extruded and blow - moulded hollow bodies made of thermoplastic . to improve the product quality and to increase the throughput , each distributor element is designed as a spiral channel distributor which distributes the individual molten plastic streams uniformly at the periphery . the ejector consists of at least two concentric tubular pieces and the peripherally distributed plastic streams issue from the front face of the ejector and unite to form a single multi - layer flexible plastic tube in the storage space in the storage head housing below the ejector .