Plastic and nonmetallic article shaping or treating: processes – Treatment of material by vibrating – jarring – or agitating... – Continuously formed or indefinite length article
Patent
1988-10-03
1990-04-24
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Treatment of material by vibrating, jarring, or agitating...
Continuously formed or indefinite length article
2642092, 2642093, 2642102, 264280, 264340, 425343, 425363, 425365, 425392, 425394, 425406, 425409, B29C 7100
Patent
active
049198700
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a process and an installation for the extrusion of a product in the shape of a film, panel, tube, rod or filament.
BACKGROUND OF THE INVENTION
The object of the present invention is to provide means which permit continuously extruding and treating a product so as to subject each length of the product travelling through the installation to conditions of pressure, temperature and vibration frequency which modify the morphological structure and, hence, the physico-chemical properties of the product, by varying these conditions of pressure, temperature and frequency in accordance with a predetermined program so as to perform a continuous rheological treatment of the product.
It is to be noted that the morphological structure of the product is in particular defined by the degree of crystallinity, the texture, the type of crystals, the shape of the crystals, the size of the crystals, the elementary shape of the crystals, the interlamellar structure, the orientation determined by the nature of the bonds and the shape of the macromolecules and, in particular in the case of amorphous plastics, the "free volume", the total free volume and the structure of the free volume, these two factors determining the extent of internal strains existing in the product in the glassy state, and probably the ductility of the product.
The physico-chemical properties of the product are, in particular, its mechanical properties, that is to say its impact strength, ductility, modulus of elasticity, flow behavior and fatigue resistance.
The electrical properties are especially the breakdown voltage, the conductivity, the charge dissipation and the insulation resistance.
The thermal properties define are use temperature, the physical ageing resistance (if the material is heated) or its resistance to corrosion, oxidation and corrosive agents.
It is already known to modify the physico-chemical properties of a product by subjecting it to pressure, temperature and frequency variations in accordance with a program drawn up beforehand, which program depends on the variations to be achieved.
However, such operations are currently only carried out on samples of products and are not carried out continuously on a product in the shape of a tube, film or rod passing through an installation.
The object of the present invention is to provide means which make it possible to carry out such a treatment continuously.
SUMMARY OF THE INVENTION
To this effect, the invention relates to a process for the extrusion of a product of the above type, characterized in that the product is caused to pass through treatment zones in which conditions of pressure, temperature and frequency set up in accordance with a defined program prevail, so as to carry out a continuous rheological treatment on the product, so as to apply these conditions of pressure, temperature and frequency to the length present in the particular zone, the process being carried out in such a manner as to cause each length of the product to travel through all the zones.
The invention also relates to an installation for carrying out this process, which installation is characterized in that it comprises a set of successive stages through which the product to be treated passes and that each length of product is subjected to the particular conditions of pressure, temperature and frequency defined in that particular stage by the rheological treatment program, each stage through which the product passes being composed of an external part and/or an internal part through which the product passes.
According to another characteristic of the invention, the external part consists of a peripheral fixed ring constituting a guide surface and touching the external surface of the product, the temperature corresponding to this stage, and the internal part is composed of rotary equipment comprising rollers revolving against the internal surface of the length of tube undergoing treatment, these rollers being subjected to the pressure exerted by a pressure ch
REFERENCES:
patent: 3205289 (1965-09-01), Carpenter
patent: 3275730 (1966-09-01), Feild
patent: 3474652 (1969-10-01), Marcovitch
patent: 3643485 (1972-02-01), Marcovitch
patent: 3883631 (1975-05-01), Murray
patent: 4141953 (1979-02-01), Kepes et al.
patent: 4288398 (1981-09-01), Lemelson
patent: 4469649 (1984-09-01), Ibar
patent: 4711624 (1987-12-01), Watson
Tentoni Leo B.
Thurlow Jeffery
LandOfFree
Process of and apparatus for treating a shaped product does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process of and apparatus for treating a shaped product, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process of and apparatus for treating a shaped product will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-33234