Abstract: A polyethylene terephthalate purification apparatus comprises at least a reactor (4) which houses the plastic material to be purified, an opening connected to a vacuum pump, stirrers (16) to ensure the stirring of the plastic material inside of the reactor (4) and a heating mechanism comprising a microwave heating device to promote the excitation of the polar molecules.

Abstract: Foamed polyester extrusion equipment has two co-rotating screws defining with an internal walls of an insulated frame, first degassing zone between a feeding zone at a feeding inlet for polyester and a first tight zone, a second degassing zone downstream of the first degassing zone, foaming agent inlet zone downstream of the second degassing zone and a pumping end zone for melted material downstream of the foaming agent zone. The first degassing zone carries out forced atmospheric degassing at lower temperature and has a first vent stack adjacent the first tight zone. The second degassing zone carries out vacuum degassing at a temperature equal to or greater than the melting point of the treated polyester material. The first degassing zone has, upstream of the first vent stack, a nozzle for inlet of preheated nitrogen gas to entrain vapours.

Abstract: A foamed polyester extrusion process and equipment can be used in plants for producing sheets, boards or tubes of foamed polyester, preferably of the type operating continuously which has a thermoregulated frame provided with a feeding inlet of pure and/or recycled polyester material inside the frame. Two co-rotating screws are arranged inside the frame, the co-rotating screws defining, with the internal walls of the frame, a first degassing zone interposed between a feeding zone placed at the feeding inlet and a first tight zone. A second degassing zone is placed downstream from the first degassing zone and is separated from the latter through the first tight zone. A foaming agent inlet zone is placed downstream from the second degassing zone and is separated from the latter through a second tight zone and a pumping end zone of the melted material is placed downstream from the foaming agent inlet zone.

Abstract: A photovoltaic panel made by direct co-extrusion of a plurality of superimposed polymeric layers and a plant for carrying out such a process.

Abstract: A high-stability composable case of the type comprising a thermoformed element made of plastic material consisting of a central panel (12) having a quadrilateral shape, the sides of which are connected, by means of fold-inviting lines (17, 18), to four sides of side panels (13, 14, 15, 16), which may be folded, in a box-like manner, on the central panel (12), there being provided corner elements for forming and blocking (25) between the central panel and the side panels, where the side panels are equipped with flap-like edges (20, 21) which protrude outwards with respect to the side panels (13, 14, 15, 16) and which can be set alongside one another in a closed box-like position of the case to be inserted two by two within a slit (37) of each corner element for forming and blocking (25), in which the flap-like edges (20, 21) provide longitudinal and transverse elements for engagement and connection (23, 27; 29, 30; 31, 32) designed to bring about a stable reciprocal positioning between the flap-like edges (20,

Abstract: Equipment for extruding an expanded polymer sheet or plate comprising an apparatus for the gravimetric loading (11) of a certain number of component polymers and/or mineral fillers, an extruding apparatus (17) consisting of a thermally controlled co-rotating twin-screw extruder (20) with a length ratio of at least 1/34 diameters, a loading pump (38) downstream of the extrusion apparatus, a static group (41) for the mixing and thermal conditioning of the mixture pumped, inserted in a thermo-regulated cartridge (42), a stratifier (44, 45) and a flat head (43), wherein, in at least one portion of the extrusion apparatus (17), there is an injection zone (29, 32) into which gas, such as CO2, coming from a container tank (30, 34), is introduced.

Abstract: Polyethyleneterephthalate extrusion equipment of material in granule form, still humid, coming from both ground recovered products and also virgin material, comprising a chassis (29), containing a co-rotating, oil-thermoregulated extruder with two screws (31, 32), which comprises a first zone (A), equipped with an opening (34) where there is an aspiration hood (35) for a first “open top” degassing, a second zone (C) where there is at least one stack (37, 38) for a further degassing, between the two zones (A, C), there being a tight zone (B), and a carrying and loading zone (E) activated by the screws (31, 32).

Abstract: A compact extruder with multiple parallel screws having a variable pitch arrangement, includes an outer casing which has at least two chambers that contain at least two screws which allow material to flow from one chamber to the other chamber through a passage, and that present a feed inlet for the material to be treated and an outlet for the material; each chamber has at least one pair of housings for the corresponding pair of screws which engage with one another, each screw presenting a long-pitch portion and a short-pitch portion.

Abstract: A sectional box with corner forming and locking elements comprising a thermoformed plastics sheet element having a central panel element of quadrilateral shape the sides of which are connected via preferential bending lines to four sides of lateral panel elements which can be bent over box-like on the central panel, in which on those sides extending from the corners of the central panel element, the lateral panel elements are provided with flanges which project outwards from the lateral panel elements and are in total mutually facing contact when the box is in its formed state.