C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
C08J 9/18 (2006.01) B29C 44/34 (2006.01)
Patent
CA 2107157
The subject invention pertains to a continuous process for expanding thermoplastic minipellets, particularly polypropylene. The minipellets are continuously expanded by continuously charging and mixing water and minipellets in a slurry tank to form a slurry which is subsequently pressurized. A blowing agent such as butane is entrained into the pressurized slurry flow, which said slurry is then heated by a heating means, such as a shell and tube heat exchanger, to the softening point of the minipellets. The heated minipellets are given the time necessary for impregnation by permitting them to flow through one or more impregnation vessels. The impregnated minipellets are released through an orifice into an expansion vessel where the blowing agent flashes off, thereby expanding the minipellets.
La présente invention a trait à un procédé continu d'expansion de minibilles thermoplastiques, en particulier de polypropylène. Dans ce procédé, les minibilles sont chargées de façon continue dans une cuve et mélangées avec de l'eau pour former un coulis mis ensuite sous pression. Un agent d'expansion, par exemple du butane, est entraîné dans le flux de coulis sous pression, lequel coulis est ensuite chauffé au moyen d'un élément chauffant, par exemple un échangeur thermique à calandre, jusqu'au point de ramollissement des minibilles. Les minibilles chauffées ont ensuite le temps nécessaire pour s'imprégner en passant dans un ou plusieurs imprégnateurs. Les minibilles imprégnées passent ensuite dans une cuve où un agent d'expansion agit sur les minibilles.
Hall Thomas N. III
Trivedi Yogesh C.
Basf Corporation
Robic
LandOfFree
Continuous process for expanding thermoplastic minipellets does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Continuous process for expanding thermoplastic minipellets, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Continuous process for expanding thermoplastic minipellets will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1721889