Method for the production of a plastic tank comprising an anti-slosh device

Patent metadata

Field	Value
Publication number	US-2018071963-A1
Application number	US-201615554484-A
Country	US
Kind code	A1
Filing date	Apr 1, 2016
Priority date	Apr 3, 2015
Publication date	Mar 15, 2018
Grant date	—

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.

First claim

1 - 14 . (canceled)

15 . 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 it 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, for example based on nitrogen or carbon dioxide, is injected into the closed mold, so as to trigger a foaming reaction of the foaming agent of the second layer.

16 . The process according to claim 15 , wherein, to obtain the thermoplastic preform comprising at least the first layer and the second layer, the first layer and the second layer are simultaneously extruded.

17 . The process according to claim 15 , wherein the preform also comprises an intermediate layer comprising at least one adhesive.

18 . The process according to claim 15 , wherein the preform also comprises a barrier layer against hydrocarbons and/or a layer comprising recycled plastic, which is (are) located between said first layer and said second layer.

19 . The process according to claim 15 , wherein the chemical foaming agent is azodicarbonamide.

20 . 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 in that a gas, for example nitrogen, is injected into said same closed mold, so as to trigger a foam expansion reaction.

21 . The process according to claim 20 , wherein said first injection-molded layer comprises at least one attachment cavity into which said second layer can penetrate during its injection into the second injection-molding cavity.

22 . The process according to claim 20 wherein said same mold comprises several points for injecting said second layer.

23 . The process according to claim 20 , wherein said second layer is a layer of polyurethane foam.

24 . The process according to claim 20 , wherein said second layer is a layer of polymer foam.

Assignees

• Plastic Omnium Advanced Innovation & Res

Inventors

• Dhaussy Franck
• Lemasson Wilfried
• Guignery Frederic

Classifications

• B29C44/1271 Primary

  the preformed parts being partially covered · CPC title

• B60K15/077

  with means modifying or controlling distribution or motion of fuel, e.g. to prevent noise, surge, splash or fuel starvation · CPC title

• B29K2075/00

  Use of {PU, i.e.} polyureas or polyurethanes {or derivatives thereof}, as moulding material · CPC title

• B29C49/22

  using multilayered preforms or parisons · CPC title

• B29C2049/0057

  Operations & Transport · mapped topic