B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 44/14 (2006.01) B29C 49/04 (2006.01)
Patent
CA 2377659
The invention relates to a method and device for producing plastic hollow bodies which are at least partially filled with foamed material (54). According to the invention, a blowing mold (22) is firstly used to expand a preform (12) by means of internal overpressure in order to form the hollow body which is then at least partially filled with plastic beads made of foamed plastic, and the plastic beads undergo an increase in volume inside the hollow body. To this end, the compressed plastic beads are subsequently introduced, while under a pressure that is greater than the pressure prevailing inside the hollow body, into the expanded hollow body still located inside the blowing mold. The plastic beads located inside the hollow body are relieved from pressure which leads to an increase in the volumes of the plastic beads, thus effecting a filling, which is as complete as possible, of at least one delimited partial volume of the hollow body with a plastic foam.
L'invention concerne un procédé et un dispositif permettant de produire des corps creux en matière plastique, qui sont remplis au moins en partie de mousse (54). Selon ce procédé, une ébauche (12) est d'abord élargie avec un moule de soufflage (22) par surpression intérieure, de manière à former le corps moulé qui est ensuite rempli au moins en partie de grains plastiques, ces derniers subissant une augmentation de volume à l'intérieur du corps creux. A cet effet, il est prévu d'introduire les grains plastiques comprimés, dans le corps creux élargi qui se trouve toujours dans le moule de soufflage, à une pression supérieure à celle régnant dans le corps creux. Les grains plastiques qui se trouvent dans le corps creux subissent une décompression qui induit une augmentation de leur volume entraînant un remplissage aussi complet que possible avec de la mousse plastique d'au moins un volume partiel délimité du corps creux.
Kautex Textron Gmbh & Co. Kg
Ridout & Maybee Llp
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