Plastic and nonmetallic article shaping or treating: processes – Forming articles by uniting randomly associated particles – With subsequent cutting – grooving – breaking – or comminuting
Patent
1995-11-06
1996-12-24
Theisen, Mary Lynn
Plastic and nonmetallic article shaping or treating: processes
Forming articles by uniting randomly associated particles
With subsequent cutting, grooving, breaking, or comminuting
264122, B29C 3502
Patent
active
055871208
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method for shaping an elementary block of stable shape and size from a polymer mixture which is compressed and constrained under a load into a defined volume of a hydraulic press, a dead volume of which is provided with spikes heated to a temperature above the softening point of at least one of the polymers of the aforementioned mixture, so as to form a block transpierced by the said spikes.
It finds its main application in civil engineering, in particular in earth works, soil lightening, insulation, drainage, earthquake protection, underground protection in mines and galleries, protection against surface cave-in, acoustic panels, cladding, movable civil-engineering structures (road bridges for passing over marshes).
It makes it possible to produce solid bodies having a bearing capacity and a structure which are appreciably better than those of a soil, exhibiting properties of continuity, flexibility, deformability and tensile strength. Practical examples of application are the playing grounds development of parking lots, sports areas, parks and sports terrains.
A method of reinforcing in-fill soil using a reinforcing structure composed of raw reused plastic textile waste, as a mixture without any conversion, is disclosed in Document EP-A-371,898.
The waste, which has a density very much less than that of soil, is highly compacted and then tied up in order to form parallelepipedal blocks of approximately 1 m.sup.3 and of density from 0.3 to 0.6 depending on the envisaged use. The method finds its main application in the construction of lightweight in-filling on compressible soils. However, the material is viscoelastic, sensitive to creep and also highly deformable immediately after releasing the hydraulic stress on expansion.
Document DE-U-9,208,143 describes a hydraulic press intended to compress fragments of a polymer mixture which is brought to the melting point by partial heating by means of heating spikes attached to a fixed platen forming the end wall of the hydraulic press. During compression, the objects not yet melted tend to push back the heating rods, deflect them and permanently deform them.
Likewise document DE-A-4,117,797 describes a similar hydraulic press in which the heating spikes are attached to the moving platen. While they are being inserted, the spikes encounter obstacles which oppose them with an increasing resistance and tend to be deflected from their straight path and to be deformed.
The present invention aims to overcome the aforementioned drawbacks. It provides, with a view to achieving internal cohesion of the fragments of the polymer mixture by transpiercing the block using spikes raised to a temperature above the softening point of at least one of the polymers of the aforementioned mixture, a method as described in the preamble of the herein-attached claim 1.
According to the invention, spikes (8), carried by a second moving platen (9) arranged with respect to the first moving platen (3), on the other side of the fixed platen (2) forming the end wall of the press (1), are made to penetrate, via orifices provided through the fixed platen (2) forming the end wall of the press, into the bale of polymers previously compacted in the dead volume of the press, during or after compression.
As raw material, the method uses recovery and/or scrap material, more particularly material scrap resulting from industrial processes and/or residual matter, sorted or unsorted, originating from the consumer market.
These raw materials are gathered and/or preconditioned according to well-known standards and are conveyed into a chamber where they may possibly be taken to a temperature of between -40.degree. C. to +1000.degree. C., thus transforming their rheological characteristics.
These raw materials are gathered and/or preconditioned according to well-known standards and are conveyed into an enclosure where they may possibly be taken to a temperature of between -40.degree. C. and +1000.degree. C., thus transforming their theological characteristics.
These raw ma
REFERENCES:
patent: 5482665 (1996-01-01), Gill
Poswick Pierre G.
Vieslet Bernard P.
Vieslet Jean-Paul B.
LandOfFree
Method for shaping a polymer mixture into a block with a stable does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for shaping a polymer mixture into a block with a stable , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for shaping a polymer mixture into a block with a stable will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1176893