Process for fastening an accessory in a blow molded plastic tank

摘要

It is proposed a process for fastening an accessory to the interior of a blow-molded tank, the tank having a plastic wall produced from a parison, the accessory comprising a body having at least one attaching portion projecting radially from the body. The process comprises the steps of:
a) introducing the accessory and the parison in a molten state into a mold so that the accessory is surrounded by the parison, the mold comprising cavities, at least one cavity being equipped with at least one movable insert configured to fold locally some of the molten parison on the attaching portion;b) contacting the parison with the attaching portion;c) moving forward the insert and folding locally some of the molten parison on the attaching portion;d) closing the mold by moving the mold cavities to a final closing position and inflating the parison to form the blow-molded tank;e) moving backwards the insert; andf) opening the mold.

主权项

1. A process for fastening an accessory to an interior of a blow-molded tank, said tank having a plastic wall produced from a parison, the accessory comprising a body having at least one attaching portion projecting radially from said body, the process comprising:
introducing the accessory and the parison in a molten state into a mould so that the accessory is surrounded by the parison, said mould comprising mould cavities, at least one of the mould cavities being equipped with at least one movable insert configured to fold locally some of the molten parison on said attaching portion; moving the mould cavities to an intermediate closing position at which the mould cavities are not pressed against one another and at which the parison contacts with said attaching portion; moving forward the insert and folding locally some of the molten parison on said attaching portion such that said attaching portion is partially or totally surrounded by molten parison; closing the mould by moving the mould cavities to a final closing position at which the mould cavities are pressed against one another, and inflating the parison to form said blow-molded tank; moving backwards the insert; and opening the mould.