Process and system for producing polyurethane molded articles having constant cross-sections - Patents.com

Abstract

A process and system for producing polyurethane products with a constant cross section, comprising the steps of arranging and fixing a number of injection molds (3) in which at least one force acts axially and optionally another force acts radially, preventing the molds from opening during polyurethane foaming, and injecting CO into the top during polyurethane foaming. 2 The process includes the steps of injecting polyurethane into one or more molds (3) that are placed inclined or vertical on a bench (4) to allow air bubbles to accumulate, waiting for the polyurethane to expand, and removing the molds (3) from the bench (4). The system comprises a polyurethane feeder (1), an in-line injection system or machine (2), at least one mold (3), and a bench (4) for positioning and fixing the fixed or movable, inclined or vertical molds (3).

Description

[Technical field]

[0001] Objects of the Invention As described in the title of this specification, the present invention relates to a process and system for producing polyurethane castable articles having a constant cross-section that serves a designed function, and has advantages and features that are disclosed in detail hereinafter.

[0002] The object of the invention relates to a process for manufacturing polyurethane products, i.e. injected polyurethane profiles with constant cross section for forming door and window frames, which is essentially based on the sequential injection of several metal moulds formed as two parts that fit together leaving a cavity with the shape of a tubular part or part thereof, on which at least an axial force acts, in the case of two parts another force acts in the radial direction to avoid openings during polyurethane foaming, the injection of polyurethane liquid resin is carried out at one of the ends of said moulds, which are elongated to form said frame and are placed either in a vertical or inclined position to facilitate the evacuation of air during expansion and to avoid aesthetic defects of the surface, e.g. holes and cavities along the entire moulded frame, which should require post-processing of the product obtained. A second feature of the invention is a system for carrying out said process, which comprises a bench for arranging and fastening the moulds, either fixed or moved, a mould in an inclined or vertical position and a mould closing means of at least axial pressure.

[0003] [Field of application of the present invention] The field of application of the present invention lies within the industrial sector involved in the manufacture of polyurethane products, but also in the range of door and window frames and closings. [Background technology]

[0004] As is well known, door and window closures are an essential part of proper insulation of a building.

[0005] Currently, most door and window frames are either plastic or wood or metal or a combination of the above materials.

[0006] The main problems with these materials are the high energy costs of production and poor thermal insulation, in addition to the increased production costs of the combined frames, which require a prior sorting process, preventing recycling.

[0007] A cheaper product, such as polyurethane, that is more efficient at insulating and easier to manufacture is desired.

[0008] However, to date, manufacturing procedures for polyurethane products have not been able to produce finishes suitable for use on door and window frames, and involve high post-processing costs.

[0009] One of the main problems is the fact that in the production of polyurethane products by injection in a mould, holes and cavities occur on the top surface of the product due to the generation of CO2 bubbles in the foaming process, so that in the case of profiles for frames, if they are positioned horizontally as they usually are, said holes and cavities occur along the entire top surface of the moulded frame, necessitating post-treatment of the product to remove them.

[0010] It is therefore desirable to avoid the defects typical of horizontal molds, since the upper surface is more accessible to air and CO2 bubbles generated during the foaming reaction, and therefore multiple air outlets are required to minimize the defects.

[0011] In FIG. 3, the horizontal filling of the mold and the subsequent formation of bubbles at the top surface of the polyurethane material within the mold can be seen, necessitating the presence of multiple exhaust outlets along with the material inlets.

[0012] Another manufacturing problem with this type of product is the high cost of the dies used, since they are machined parts of aluminum or other metals, so it is desirable to reduce the cost of said dies by using metal dies, preferably made from extruded parts of aluminum, with the intention of including automation techniques to handle multiple dies.

[0013] The object of the present invention is therefore to develop an improved manufacturing process for polyurethane products, essentially focusing on the manufacture of polyurethane frames for door and window closures made from said material, making it possible to provide thermal and sound insulation, cheaper prices and ease of recycling.

[0014] On the other hand, it should be pointed out that, in relation to the current state of the art, at least the Applicant is not aware of the existence of any other process or system for producing this type of cast product of polyurethane having technical, structural and compositional characteristics equivalent or similar to those of the process claimed in this specification. Summary of the Invention

[0015] The process and system for producing polyurethane moulded products with constant cross-section proposed by the present invention constitute an optimal solution to the above-mentioned objectives, the characteristic details which identify them being duly set out in the final claims attached hereto.

[0016] What the invention proposes, as mentioned above, is, on the one hand, a process for manufacturing polyurethane products, i.e. products consisting of injected polyurethane profiles for forming frames and leaves for doors and windows (hereinafter frames), essentially based on the successive injection of a metallic mould formed by two parts that fit together leaving a cavity with the shape of a tubular part or part, on which at least an axial force is applied and, in the case of two parts, another radial force is applied to avoid openings during polyurethane foaming, the injection of polyurethane liquid resin is carried out at one of the open ends of said mould, which is elongated to form said frame and positioned either in a vertical or inclined position, avoiding the formation of surface aesthetic defects such as holes and cavities caused by CO2 bubbles and which should require a post-processing of the product obtained. A second aspect of the invention is a system for carrying out said process.

[0017] More specifically, the object of the process of the invention for producing said polyurethane moulded products is a continuous moulding process, preferably by injection, which in any case essentially comprises the following steps: - placing and fastening the injection mould obtained by extrusion without further modifications or adaptations, preferably a series of elongated moulds, on a bench prepared for this purpose, in order to avoid the opening of the mould during polyurethane foaming, i.e. to close the mould at the bottom so as to prevent the product from escaping and, if the mould is formed by two parts, to avoid the mould detaching; - injecting polyurethane into one of the ends of one or more molds arranged inclined or vertically on the bench, so as to reduce the possibility of the formation of holes and cavities caused by CO2 bubbles during the polyurethane foaming process, only in the upper part of the mold; - waiting for the polyurethane to expand; - Steps for removing the mold from the bench and Includes.

[0018] Optionally, the process includes one or more additional steps, preferably consisting of the following steps: - allowing the mold to rest for the polyurethane to cure and ensure that the part is completely finished before continuing with processing; - opening the mould and withdrawing the product from the mould, taking care that each part follows a different path in the production line, on the one hand allowing the mould or its parts to be eventually reused, and on the other hand the product is obtained; - cleaning the mould to ensure that it can be reused in perfect condition, avoiding the presence of any residues that may accumulate on the inner surfaces of the mould; - closing the moulds before polyurethane injection and keeping the lower part closed to avoid the polyurethane exiting by gravity and, if fitted, keeping the two parts of each mould fitted together, preferably the moulds are extrusion moulds and may have a tubular shape or may be formed by two parts; - during the step in which the mould is on the bench, the process may include an intermediate step of carrying out a change in the inclination of the mould, thereby resulting in a complete hardening of the product by inducing the generation of possible CO2 bubbles, allowing the CO2 to accumulate only in the upper part of the mould; - finishing the product, which may include cutting off a part of the product to discard the top part where the holes and cavities formed by the CO2 bubbles are concentrated, and / or coating the obtained part with some coating. Further includes:

[0019] Furthermore, in the step of injecting polyurethane into one or more molds arranged at an angle or vertically, it is important to point out that in an embodiment aspect of this procedure, the injection of said product is carried out at the open top of the mold, which simultaneously functions as the inlet for the material and the outlet for the air.

[0020] Also, in an alternative embodiment of this procedure, the filling is carried out at the open lower end of the mold, in which case it is intended that there is an air outlet at the upper end of the mold, this option having the advantage that contamination and turbulence when dripping the polyurethane liquid resin are avoided.

[0021] Finally, it should be noted that in an aspect of the embodiment, at least the step of injecting polyurethane into one or more molds is carried out by a manual process with molds positioned inclined or vertically fixed directly on the bench.

[0022] Also, in another alternative embodiment, at least said step of injecting polyurethane into one or more moulds is carried out by an in-line, continuous or semi-continuous process, in which the bench is provided with moving means, e.g. a conveyor belt, and the moulds, placed in an inclined or vertical position, are positioned such that the injections are carried out multiple times and in series.

[0023] On the other hand, following the previously published process, the object of the present system for producing polyurethane products is essentially to provide a polyurethane product which is produced by: - at least an injection mould; - a polyurethane injection system or machine adapted to inject polyurethane into an injection mould; - a bench for clamping the injection mould under the injection system; Equipped with.

[0024] Further, optionally, the system for producing a polyurethane molded product also comprises: - a system for moving the injection mold towards the injection system and removing the mold after the polyurethane has been injected; - A system for placing the injection mould in a storage unit to cure the polyurethane after foaming; - a system for opening the mould and removing the part or product obtained therein; - a system for cleaning injection moulds; - a system for closing the injection mould and preparing it for a new use; Equipped with.

[0025] Preferably, the disclosed system is an automated system that synchronizes and manages all subsystems to execute a programmed and monitored continuous production process in an Industry 4.0 environment.

[0026] Preferably, the moulds are manufactured by extrusion without any kind of further modification or adaptation and are open at their two ends.

[0027] The bench is provided with means for closing one end of the injection mould and allowing the polyurethane to be injected at the other end. Closing the mold can be done on the bench, for example by some elements that hold the mold closed while the polyurethane is foaming and pressure is applied from the inside, or the mold can be pre-closed, for example by girths or clamps that hold the mold closed while the polyurethane is foaming and pressure is applied from the inside.

[0028] Furthermore, the bench can be fixed and incorporate a fixed style mold as well as a closing means and axial pressure, in the case of a mold formed by two parts, a closing means and radial pressure, and can perform the injection process manually, or in another embodiment, the bench can be equipped with moving means, for example a conveyor belt, and the mold clamped by the stabilizing guides moves under the product injection system or machine and clamped to an axial pressure closing means, and can perform an in-line injection process, either continuous or semi-continuous.

[0029] The advantages provided by the process and system objects of the present invention are thereby multiple, as will become apparent below.

[0030] As explained in the previous point, the reason why the mold for the polyurethane part or product to be produced is preferably placed in a vertical position and elongated to form the outline of the frame is to avoid surface aesthetic defects such as holes and cavities along the entire molded frame, which require post-processing. These defects are typical of horizontal molds because the air and CO2 bubbles generated during the foaming reaction have easy access to the top surface, and therefore multiple air outlets are required to minimize it. Instead, in a vertical mold configuration, the inlet acts as a giant vent at the top of the mold, efficiently venting the air and bubbles while concentrating all the defects after the part's curing reaction at the top. The top end can then be discarded after the part is pulled out, resulting in a defect-free frame without the need for post-processing.

[0031] Another main point of the continuous injection molding process of the present invention is the use of an aluminum mold consisting of one or two extruded parts instead of the usual machined parts. The use of molded parts of extruded material significantly reduces the manufacturing costs of the mold. A 3m CNC rolled aluminum mold has a value of 8,000 euros, while the same mold consisting of extruded parts has a value of 250 euros, which means a significant cost reduction. This allows the use of hundreds of molds in a continuous manufacturing process with higher productivity, but due to the large number of molds involved in this process, more automated techniques are required to manage the molds in an Industry 4.0 environment.

[0032] The significant cost savings achieved in the manufacture of molds by extrusion allows the development of reactive sequential injection molding processes using multiple molds and allows a wide range of mold designs to be used simultaneously for different types of products, i.e. door and window frame profiles. The objective of the process and system of the present invention is therefore to advantageously enable highly productive and versatile production on demand, saving energy, operating costs and unnecessary stock of molded frames, since less storage space is required.

[0033] Additionally, the multiple molds involved allow the part to remain in the mold for a longer period of time, which is an important factor for drawing polyurethane parts, as the longer this time, the more the resin cures, avoiding stresses during drawing that can cause the part to bow or distort.

[0034] On the other hand, the material is separated from the metal or glass by floating on water after the grinding process, so recycling is much less of a problem than for multilayer windows due to their single-material composition. The resulting ground polyurethane shavings can be easily ground to obtain a finely divided powder that is newly introduced as a reinforcing filler in the manufacturing process with up to 25% and has excellent mechanical and chemical compatibility with polyurethane liquid resins. [Brief description of the drawings]

[0035] In order to supplement the description given and to aid in the best understanding of the characteristics of the present invention, the following drawings, attached as an integral part hereof, are given by way of illustration and not by way of limitation:

[0036] [Figure 1] FIG. 1 shows a schematic diagram of an example of an embodiment of a system for producing polyurethane molded products having objects of constant cross section according to the present invention, in which the main parts and elements that the system comprises can be seen. [Figure 2-A] FIG. 1 shows in perspective view an example of two extrusion molded parts forming a first example of a two part mold for forming a polyurethane profile for a window frame, in this case for a window leaf and its respective polyurethane parts obtained with said mold and forming the profile of the frame and leaf. [Figure 2-B] FIG. 2 shows in perspective view an example of an extrusion molded part forming two parts of a second example of a mold for forming another polyurethane profile for a window frame, in this case for a window leaf and its respective polyurethane part obtained with said mold and forming the profile of the frame and the leaf. [Figure 2-C]FIG. 2 shows in perspective view an example of an extrusion molded part forming two parts of a second example of a mold for forming another polyurethane profile for a window frame, in this case for a window leaf and its respective polyurethane part obtained with said mold and forming the profile of the frame and the leaf. [Diagram 3] FIG. 1 shows a schematic side view of several molds in a filling step arranged horizontally according to the prior art. [Figure 4] 1A-1D show schematic side views of several molds in a vertical filling step with material injected from the top according to the present invention. [Diagram 5] 1A-1D show side views of several molds in a vertical filling step with material injected from the bottom according to the present invention. [Figure 6] 1 shows an elevational view of the end of a mold in an example with an axial pressure closure system with a movable piston-shaped device according to the system of the invention. [Figure 7] FIG. 2 shows a side view of an example of a bench with a mold and a closing system by axial pressure with a movable piston-shaped device. [Figure 8] 1 shows both a mold and a top perspective view of an example of a bench equipped with an axial pressure closure system with a movable piston mold device. [Figure 9] FIG. 2 shows an elevational view of the end of a mold in an example with an axial pressure closure system with fixed and replaceable strut-shaped devices according to the system of the invention. [Figure 10] FIG. 10 shows a side view of a bench with a mold closure system as shown in FIG. [Figure 11] 1 shows an elevational view of the end of a mold according to the system of the invention, in this case an example of a closure system by axial pressure with a fixed screw type device. [Figure 12] FIG. 12 shows a side view of a bench equipped with a mold closing system as shown in FIG. [Figure 13] 1 shows a schematic diagram of the main elements of a system for producing polyurethane molded products with objects of constant cross section according to the invention, in this case an example of in-line injection along a movable bench. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0037] Reference can be made to the disclosed drawings, and by their associated numerals, to non-limiting examples of embodiments of the system for producing polyurethane molded products having a constant cross-section of the present invention, including those disclosed in detail below.

[0038] Thus, as can be seen from said figures, the system for manufacturing polyurethane products, preferably products made up of elongated parts (9), such as profiles for forming door and window frames, essentially comprises the following elements: - a polyurethane product feeder (1); - an in-line injection system or machine (2) for injecting the product in liquid or fluid form into a mould (3); - at least a mould (3), preferably a series of moulds (3), having the shape of the part to be produced, at least open at its upper end; - a bench (4) for positioning and clamping the inclined or vertically positioned moulds (3); Equipped with.

[0039] Preferably, the system further comprises, in a preferred embodiment of the present invention: - a mould (3) provider (5) and extractor (6) system which first moves the mould (3) towards the injection system (2) and then extracts the mould (3) from the injection line (2) after the polyurethane has been injected, preferably formed by two robotic arms installed at either end of the bench (4), one being the provider (5) and the other being the extractor (6); It is an automated system comprising:

[0040] Preferably, the manufacturing system also comprises a storage unit (7) in which, after foaming of the polyurethane in the mould (3), the extractor system (6) places the mould (3) preferably in a horizontal position for curing the polyurethane.

[0041] Preferably, the manufacturing system also comprises a mould opening system (8) which, in the event the mould is formed in two parts (a, b), opens said two parts to remove the cured part (9) and separate the production line on one side of the mould (3) for reuse and the formed polyurethane part (9) for finishing on the other side.

[0042] Preferably, the manufacturing system comprises a mould (3) cleaning system (10) where the moulds (3) arrive from a previous opening system (8) for cleaning and reuse.

[0043] Preferably, the manufacturing system comprises at least a closure system (11) for closing the mould end (3), preferably the lower part, by applying axial pressure.

[0044] In one embodiment, the closing system (11) of the mold (3) that closes it at the bottom is integrated into the placing and fastening bench (4) itself by elements that hold the mold (3) closed when the polyurethane foams and pressure is applied from the inside. Thus, in addition to placing and fastening the injection mold (3), the bench (4) simultaneously closes one of the injection mold ends (3), preferably the bottom one, and allows the injection of polyurethane from the other end, the top end.

[0045] Furthermore, if the mould (3) is formed in two parts (a, b), the closure system (11) also comprises radial pressure closure means for holding the parts of the mould (3) together.

[0046] According to figures 6 to 12, three different options for said closure system (11) are shown, without excluding other options.

[0047] Specifically, in the first option, which can be seen in Figures 6, 7 and 8, the closing system (11) holding together the two parts (a, b) forming the mould (3) is an axial and radial pressure closing system equipped with a piston-shaped movable device (17).

[0048] According to FIG. 7 one can see a bench (4) on which several moulds (3) are mounted, which are closed at the lower end by a bottom cover (18) and closed at the upper end after being filled with gate-shaped axial pressure elements (19) and with them several radial pressure pistons (17).

[0049] In another option of the embodiment shown in figures 9 and 10, the closing system 11 of the two parts (a, b) of the mould (3) is a closing system by axial and radial pressure, with fixed strut-shaped exchangeable devices (20). According to figure 10 it can be seen how, in a bench (4) in which several moulds (3) are integrated, the moulds (3) are closed at the lower end by a bottom cover (18) and at the upper end after filling by a gate-shaped axial pressure element (19) and with them several radial pressure struts (20).

[0050] Also, in another option of the embodiment shown in figures 11 and 12, the closing system (11) of the two parts (a, b) of the mould (3) is a closing system by axial and radial pressure, with fixed screw-type devices (21). According to figure 12 it can be seen how, in a bench (4) in which several moulds (3) are assembled, the moulds (3) are closed at the lower end by a bottom cover (18) and at the upper end after the moulds (3) have been filled by gate-shaped axial elements (19) and together with them several radial pressure screws (21).

[0051] Alternatively, as in the example shown in FIG. 1, the closing system (11) is a module independent of the bench (4) and the mould (3) is pre-closed, for example by girths or clamps (3'), which hold the mould (3) closed when the polyurethane foams and pressure is applied from inside.

[0052] Preferably, the moulds (3) are manufactured by extrusion without any kind of further modification or adaptation and are open at both ends. They may be formed by a single tubular extruded part or by two extruded parts forming the respective parts (a, b) of the mould (3) fixed to each other in a closure system (11) that holds them in a vertical position.

[0053] In figures 2-A, 2-B and 2-C two examples of embodiments of said profiles forming the two parts (a, b) of the mould (3) can be seen.

[0054] Specifically, in FIG. 2-A, there is shown an example of two extrusion molded parts forming two parts (a, b) of a first example of a mold (3) for forming a polyurethane part (9) having an outer shape for a window frame, in FIG. 2-B, there is shown an example of two other extrusion molded parts forming two parts (a, b) of a second example of a mold (3) for forming a polyurethane part (9) having a different outer shape for a window leaf, and in FIG. 2-C, there are shown respective parts (9) of polyurethane obtained using said mold (3).

[0055] Optionally, the system comprises a system (12) for coating the obtained polyurethane parts (9), which proceeds to apply a coating or a finish coat to the parts (9) after they have been removed from the mould (3), likewise provided is a distribution system (13) for the parts (9) which transports the parts (9) from an exit belt (14) of the opening system (8) of the mould (3) to said coating system (12).

[0056] Although not shown, the coating system (12) may also include a cutting means for removing a disposable portion of the part, preferably its upper end, where holes and cavities formed by the CO2 bubbles remain accumulated.

[0057] According to figure 4, a schematic diagram of the arrangement of an inclined mould (3) according to the system of the invention can be seen, in one example, the top of the resulting polyurethane part (9) filled vertically at the top via the injection system (2), only part of the top has air bubbles, which can be discarded. In this option, the open end of the mould (3) for the material inlet then serves as the simultaneous air outlet (16), so that the mould (3) only needs to be open at its top.

[0058] On the side of Figure 5 one can see an alternative option where the injection of the material by the injection system (2) takes place at the bottom of the mould (3), in which case the presence of an air outlet (16) is envisaged at the top end of the mould (3). This option requires that both ends of the mould are open, but has the advantage of avoiding contamination and turbulence when dripping the polyurethane liquid resin.

[0059] According to FIG. 3, when the position of the mold (3) is horizontal, the difference can be seen that according to the prior art, air bubbles will be generated all over the top surface of the polyurethane material, and by using the material inlet (2), the presence of multiple exhaust ports (16) is required to minimize the air bubbles.

[0060] On the other hand, notwithstanding all the above, in an optional embodiment shown in FIG. 13, the bench (4) is provided with moving means, for example a conveyor belt (22) along which the moulds (3), preferably held by stabilising guides (23), move so as to pass in single file under the product injection system or machine (2).

[0061] Further options of this embodiment include at least an axial pressure closing system (11) which closes the upper end of the mold (3) and is preferably provided with an axial pressure element (19) formed by a roller integrated in an upper closure belt (24), allowing the mold (3) to be subjected to a continuous or semi-continuous in-line injection process.

[0062] Finally, it should be pointed out that preferably, the polyurethane product used to fully or partially feed the system feeder (1) comprises fully or partially polyurethane obtained from recycled parts (9') previously manufactured in the system itself, after a prior part grinding process in a pulverizer (15) provided in the system prior to the feeder (1).

[0063] Having fully disclosed the nature of the invention and the manner in which it may be practiced, it is believed that the description need not be extended any further in order for those skilled in the art to appreciate the scope of the invention and the advantages resulting therefrom.

Claims

Claim 1 A process for manufacturing a polyurethane molded product having a continuous cross-section, comprising: - Placing one or more injection molds (3) on a bench (4) and fastening them to avoid opening of the molds during polyurethane foaming, wherein the molds (3) are manufactured by extrusion without further modification or adaptation, and as a result, the molds (3) have a fixed cross-sectional shape with an open end; - Closing both ends of the mold (3) while enabling injection of polyurethane from one end of the mold (3); - Injecting polyurethane from one of the ends of the one or more molds (3) disposed inclined or vertically on the bench (4), and during the polyurethane foaming process, CO ２ Accumulating the possibility of forming holes and cavities caused by air bubbles only at the upper part of the mold (3); - Waiting for the polyurethane to expand; - Pulling the mold (3) out of the bench (4). A process characterized by the above. Claim 2 A process for manufacturing a polyurethane molded product having a continuous cross-section according to claim 1, including an intermediate step of changing the inclination of the mold (3) during the step where the mold is on the bench. Claim 3 In the step of injecting polyurethane into the one or more molds (3) arranged obliquely or vertically, the injection of the product is carried out at the upper end of the opening of the mold (3) that functions simultaneously as a material injection port and an air outlet (16). A process for manufacturing a polyurethane molded product having a continuous cross-section according to claim 1 or 2. Claim 4 In the step of injecting polyurethane into the one or more molds (3) arranged obliquely or vertically, when the presence of an air outlet (16) is intended at the upper end of the mold (3), the injection of the product is carried out at the open lower end of the mold (3). A process for manufacturing a polyurethane molded product having a continuous cross-section according to claim 1 or 2. Claim 5 The step of injecting polyurethane into the one or more molds (3) arranged obliquely or vertically is carried out by a manual process using the mold (3) directly fixed and placed on the bench (4). A process for manufacturing a polyurethane molded product having a continuous cross-section according to any one of claims 1 to 2. Claim 6 When the bench (4) comprises movable means for arranging the molds such that injection is performed a plurality of times in series, the step of injecting polyurethane into the one or more molds (3) arranged obliquely or vertically is carried out by a serial, continuous or semi - continuous process, a process for manufacturing a polyurethane molded product having a continuous cross - section according to any one of claims 1 to 2.

7. A system for manufacturing a molded product of polyurethane having a constant cross - section, comprising: - a feeder (1) for a polyurethane product; - a serial injection system or machine (2) for injecting the product in liquid or fluid form into the mold (3); - a mold (3) having at least an open upper end and having at least the shape of the part to be manufactured, wherein the mold (3) is further manufactured by extrusion without further modification or adaptation, and as a result, the mold (3) has a fixed cross - section shape with open ends; - a closing and joining system (11) for closing the end of the mold (3) and, when the mold (3) is manufactured by two parts (a, b), joining the two parts (a, b); - a bench (4) for arranging and fixing the mold (3) positioned obliquely or vertically; A system, characterized by comprising the above.

8. The closing and joining system (11) comprises a lower cover (18) for closing the lower end of the mold (3) and an axial pressure element (19) for closing the upper end of the mold (3), a system for manufacturing a molded product of polyurethane having a constant cross - section according to claim 7.

9. The axial pressure element (19) is formed by a roller integrated with an upper closing band (24), a system for manufacturing a molded product of polyurethane having a constant cross - section according to claim 8.

10. The closing and joining system (11) is an independent module of the bench (4), and further includes a girth or clamp (3') for joining the parts (a, b) of the mold when the polyurethane foam foams and pressure is applied from the inside, a system for manufacturing a molded product of polyurethane having a constant cross - section according to claim 8 or 9.

11. The bench (4) includes moving means such as a conveyor belt (22) over which the mold (3) moves so as to pass in a row under the injection system or machine (2) of the product, for a system for manufacturing a polyurethane molded product having a constant cross-section according to claim 8 or 9.

12. A system for manufacturing a polyurethane molded product having a constant cross-section according to claim 11, further comprising a stabilization guide (23) for fixing the mold (3).

13. A system for manufacturing a polyurethane molded product having a constant cross-section according to any one of claims 7 to 9, which is an automated system that synchronously manages all subsystems for performing automated continuous production.

14. The closing system (11) of the two parts (a, b) of the mold (3) is a closing system by axial and radial pressures provided with a fixed threaded mold device (21), for a system for manufacturing a polyurethane molded product having a constant cross-section according to any one of claims 7 to 9.

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