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 flows from the ejector through an annular gap into the storage space in the storage head housing below the ejector .