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An apparatus for continuously forming a continuous element made of expanded plastic material comprises: a loading section of a mass of granules made of expandable plastic material; a sintering section of the continuous element made of expanded plastic material extending downstream of the loading sec

An apparatus for continuously forming a continuous element made of expanded plastic material comprises: a loading section of a mass of granules made of expandable plastic material; a sintering section of the continuous element made of expanded plastic material extending downstream of the loading section; a stabilizing section of the continuous element made of expanded plastic material extending downstream of the sintering section; a forming tunnel extending along the sintering and stabilizing sections and defined between a pair of lateral walls and a pair of gas permeable conveyor belts, supported by respective supporting tracks. Further, at least one of the supporting tracks of the gas permeable conveyor belts comprises at least one portion extending in the sintering section and angularly tiltable with respect to a transversal centerline plane (π) of the forming tunnel for varying the height of the tunnel in a longitudinal direction.

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1. An Apparatus for continuously forming a continuous element made of expanded plastic material comprising: a) a loading section of a mass of granules made of expandable plastic material;b) a sintering section of said continuous element made of expanded plastic material, extending downstream of said

1. An Apparatus for continuously forming a continuous element made of expanded plastic material comprising: a) a loading section of a mass of granules made of expandable plastic material;b) a sintering section of said continuous element made of expanded plastic material, extending downstream of said loading section;c) a stabilizing section of said continuous element made of expanded plastic material, extending downstream of said sintering section;d) a forming tunnel extending along said sintering and stabilizing sections and defined between a pair of lateral walls and a pair of gas permeable conveyor belts, respectively lower and upper, said belts being supported by respective lower and upper supporting tracks;wherein at least one of the supporting tracks of the gas permeable conveyor belts comprises at least two angularly tiltable portions of at least two box-shaped elements in the sintering section, each box-shaped element being structurally independent and angularly tiltable with respect to a transversal centerline plane of the forming tunnel for varying a height of the forming tunnel in the longitudinal direction;wherein each of the lower and upper supporting tracks of the gas permeable conveyor belts comprises a respective displacing group for each of the lower conveyor belt and the upper conveyor belt, wherein each displacing group being arranged at the sintering section; andwherein each of said respective displacing groups of the lower and upper gas permeable conveyor belts comprises a supporting and displacing belt forming a movable and gas permeable wall cooperating with a respective lower and upper gas permeable conveyor belt, said supporting and displacing belts of the displacing groups being substantially translationally integral with the respective lower and upper gas permeable conveyor belt. 2. The apparatus according to claim 1, wherein said at least two box-shaped elements of the sintering section are angularly tiltable and said tiltable portions of said at least two box-shaped element are constituted by a wall of said at least two box-shaped elements cooperating with one of said gas permeable conveyor belts. 3. The apparatus according to claim 1, further comprising a delivering element for delivering a hot fluid for expanding the granules made of expandable plastic material arranged at the sintering section. 4. The apparatus according to claim 1, wherein said at least two box-shaped elements are at least two structurally independent box-shaped elements arranged in said sintering section and aligned along said forming tunnel, each of said box-shaped elements being angularly tiltable with respect to the transversal centerline plane of said tunnel for varying the height of the tunnel in the longitudinal direction. 5. The apparatus according to claim 1, wherein each of said lower and upper supporting tracks of the gas permeable conveyor belts comprises at least a pair of structurally independent box-shaped elements arranged in the sintering section and aligned along the forming tunnel. 6. The apparatus according to claim 5, wherein at least two box-shaped elements of the lower supporting track and at least two box-shaped elements of the upper supporting track are angularly tiltable with respect to the transversal centerline plane of the forming tunnel for varying the height of the tunnel in the longitudinal direction. 7. The apparatus according to claim 5, wherein the box-shaped elements of the lower and upper supporting tracks of the gas permeable conveyor belts arranged in the sintering section are symmetrically arranged with respect to the transversal centerline plane of the forming tunnel. 8. The apparatus according to claim 5, wherein the box-shaped elements arranged in the sintering section comprise a sliding block for supporting each of the respective gas permeable conveyor belt arranged at at least one longitudinal end of said at least two box-shaped elements. 9. The apparatus according to claim 2, wherein said at least two box-shaped elements are angularly tiltable with respect to the transversal centerline plane of the forming tunnel by means of an angular adjusting device cooperating with a longitudinal end of said at least one box-shaped element. 10. The apparatus according to claim 9, wherein said angular adjusting device is provided with a sensor adapted to detect thrust forces generated in the sintering section upon expansion of the granules made of expandable plastic material and to drive in a vertical direction a displacing device of longitudinal end of said at least two box-shaped elements. 11. The apparatus according to claim 1, wherein at least one of said gas permeable conveyor belts is constituted by a gas permeable flexible element. 12. The apparatus according to claim 11, wherein said gas permeable flexible element has a perforated area comprised between 8% and 20% of its total area. 13. The apparatus according to claim 1, wherein each of said supporting and displacing belt is substantially a track type. 14. The apparatus for continuously forming said continuous element according to claim 1, further comprising: a plant having a section for feeding a mass of granules made of expandable plastic material. 15. The apparatus for continuously forming a continuous element made of expanded plastic material according to claim 1, further comprising: a plant having a feeding section disposed to feed a mass of granules made of expandable plastic material, said feeding section being upstream of said forming apparatus; anda cutting section disposed to cut said continuous element made of expanded plastic material, said cutting section being arranged downstream of said apparatus. 16. The apparatus according to claim 13, wherein each of said supporting and displacing belt is operated by a respective motor group with an interposition of a kinematic motion transmission. 17. The apparatus according to claim 13, wherein each of said supporting and displacing belt comprises a plurality of rectangular segments hooked to each other and defining therebetween a plurality of spaces adapted to allow a passage of fluid. 18. The apparatus according to claim 11, wherein said at least one of said gas permeable conveyor belts is constituted by a net of synthetic material or a woven fabric. 19. The apparatus according to claim 18, wherein said at least one of said gas permeable conveyor belts is constituted by a flexible fabric made of a polyester fabric modified in weft and yarn and highly resistant to hydrolysis. 20. The apparatus according to claim 18, wherein said at least one of said gas permeable conveyor belts has a perforated area distributed in a homogeneous manner throughout an entire surface extension thereof and is configured to form a jointless closed loop.