Method for the production of a plastic tank comprising an anti-slosh device
AssigneePlastic Omnium Advanced Innovation and Research
InventorsFranck Dhaussy, Wilfried Lemasson, Frederic Guignery
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Abstract
A process is disclosed for manufacturing at least one wall of a tank and comprises at least a first layer of thermoplastic and a second foam-based layer. The second foam-based layer forms at least part of an anti-slosh device, and the process is characterized in that the first layer and the second layer are molded in the same mold.
Claims12
A process for manufacturing at least one wall of a tank comprising at least a first layer of thermoplastic and a second foam-based layer, said second foam-based layer forming at least part of an anti-slosh device, the first layer and the second layer being molded in the same mold, comprising:
- a thermoplastic preform comprising at least the first layer and the second layer is inserted into said same open mold;
- said same mold is closed;
- and
- once said same mold is closed, the preform is blow-molded by means of a fluid under pressure to press the preform against said same mold,
- wherein said second layer is a layer formed from a blend of a thermoplastic polymer and of a chemical foaming agent, and in that, once said same mold is closed, a gas or a liquid containing a reagent is injected into the closed mold, so as to trigger a foaming reaction of the foaming agent of the second layer.
A process for manufacturing at least one wall of a tank comprising at least a first layer of thermoplastic and a second foam-based layer, said second foam-based layer forming at least part of an anti-slosh device, the first layer and the second layer being molded in the same mold, comprising:
- said same mold is placed in a first closing position so as to form a first injection-molding cavity;
- said first layer is injection-molded;
- said same mold is placed in a second closing position so as to form a second injection-molding cavity;
- said second layer is injection-molded;
- and
- a gas is injected into said same closed mold, so as to trigger a foam expansion reaction.
Dependencies are inferred from the claim text.