PVC co-extrusion integrated window sash and manufacturing process thereof

Abstract

The application discloses a PVC co-extrusion integrally-formed window sash and a manufacturing process thereof, and belongs to the technical field of building doors and windows. The PVC co-extrusion integrally-formed window sash comprises a window sash body and metal connecting pieces arranged on both sides and four corners of the window sash body. The window sash body is a double-layer co-extrusion structure PVC rectangular frame body which is integrally formed through a co-extrusion process. The metal connecting pieces are pre-embedded on both sides and four corner positions of the window sash body. Symmetrical embedding blocks are arranged on both sides of the metal connecting pieces, and a plurality of barb-shaped protrusions are fixed on the embedding blocks. The window sash body can be integrated with a sealing rubber strip, a multi-chamber structure filled with thermal insulation material, a mounting groove provided with anti-skid protrusions and a shock-absorbing pad and an eagle beak water guide edge. The PVC co-extrusion integrally-formed window sash and the manufacturing process thereof solve the problems of traditional corner assembly, cracking of a welding seam of a window sash, damage of a structure of a rear-mounted connecting piece and easy loosening, and the overall strength of the window sash is effectively improved.

Description

Technical Field

[0001] This invention belongs to the field of building door and window technology, specifically relating to PVC co-extruded integral molded window sashes and their manufacturing process. Background Technology

[0002] PVC plastic doors and windows, with their significant advantages such as light weight, corrosion resistance, excellent thermal insulation performance, low production cost, and convenient installation, have become the most widely used type of doors and windows in my country's civil buildings, playing a dominant role in areas such as affordable housing construction, energy-saving renovation of old residential areas, and commercial housing development. Currently, the mainstream manufacturing process for PVC window sashes in the industry still adopts the traditional process of "profile extrusion, fixed-length cutting of four materials, hot-melt welding of four corners, and accessory assembly".

[0003] Traditional PVC window sash corner connections rely on hot-melt welding. During welding, the PVC material at the contact surfaces of the profiles melts and then cools to bond. The molecular chains in the weld area are not fully rearranged, resulting in numerous micropores and stress concentration points, leading to insufficient strength at the weld joint. In actual use, the window sash is subjected to natural wind pressure, thermal expansion and contraction stress caused by temperature changes, and repeated impacts from opening and closing the window. Microcracks will first appear in the weld area. These microcracks will continue to expand over time, eventually leading to corner cracking, overall window sash deformation, and ultimately causing problems such as air leakage, water leakage, and difficulty in opening and closing. To compensate for insufficient welding strength, the industry generally adopts the remedial measure of adding metal corner brackets or connectors at the corners after welding. However, this post-installation method requires drilling and grooving in the PVC profile, which not only destroys the integrity of the multi-chamber structure of the profile and reduces the thermal insulation performance of the window sash, but also the post-installed connectors and PVC profiles only have rigid contact without an effective mechanical interlocking structure. After long-term use, screws are prone to loosening, connectors may shift or even fall off, further aggravating the risk of corner connection failure. This is especially true for large-size window sashes in high-rise residential buildings, where wind pressure loads can reach hundreds of Newtons, making the safety hazards of traditional connection methods particularly prominent. Summary of the Invention

[0004] The purpose of this invention is to provide a PVC co-extruded integral molded window sash to solve the problems mentioned in the background art, where the corner connection of traditional PVC window sashes relies on hot melt welding process, resulting in insufficient strength at the weld joint. In addition, the remedial measures of adding metal corner brackets or connectors later destroy the integrity of the multi-chamber structure of the profile, reduce the thermal insulation performance of the window sash, and after long-term use, screws are prone to loosening, connectors may shift or even fall off, further aggravating the problem of corner connection failure.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a window sash body and metal connectors disposed on both sides and four corners of the window sash body. The window sash body has a double-layer co-extruded structure, with a surface layer of dense, non-foamed, high-hardness PVC and a core layer of closed-cell foamed PVC. The cross-section clearly shows the separation of the solid outer layer and the foamed core. It is integrally formed into a rectangular frame through a co-extrusion process. The metal connectors can be pre-embedded on both sides and four corners of the window sash body, including L-shaped galvanized steel plate connectors pre-embedded at the four corners and aluminum alloy strip connectors pre-embedded on both sides. The metal connectors are used to connect to the window frame via screws. Embedded blocks can be symmetrically arranged on both sides of the metal connectors, and multiple barbed protrusions are fixed on the embedded blocks. Both the barbed protrusions and the embedded blocks are completely embedded inside the PVC material of the window sash body. The metal connectors have multiple through-hole threaded holes, and the axis of the threaded holes is perpendicular to the connection surface between the window sash body and the window frame.

[0006] In a further embodiment, the outer edge of the window sash body is integrally formed with a fixing groove, and a sealing strip is fixed in the fixing groove. The interior of the window sash body may have multiple independent heat insulation cavities, and the heat insulation cavities may be filled with a heat insulation layer.

[0007] In a further embodiment, an installation groove may be provided on the inner side of the window sash body, and a shock-absorbing pad is fixed on the inner wall of the installation groove. Multiple anti-slip protrusions are integrally formed on the inner wall of the shock-absorbing pad.

[0008] In a further embodiment, the bottom of the window sash body is machined into a beak-shaped water-guiding edge using a cutting process.

[0009] In a further embodiment, the metal connector is made of aluminum alloy strips placed on both sides of the window sash, or is made of galvanized steel sheet stamped into an L-shaped structure, with the two sides of the L-shape pre-embedded in the two adjacent frame frames of the window sash body.

[0010] In a further embodiment, the barbed protrusion forms an angle of 30-45° with the metal connector and is inclined away from the threaded hole.

[0011] In a further embodiment, the sealing strip is made of EPDM rubber, has a multi-chamber cross-section, and the lip of the sealing strip has an anti-slip texture on the contact surface with the window frame.

[0012] In a further embodiment, the insulation layer can be made of polyurethane foam or polystyrene foam, which is filled into the insulation cavity by high-pressure injection, or it can be sealed at both ends to achieve air insulation.

[0013] The manufacturing process of PVC co-extruded integral molded window sash includes the following steps: S1 mold and material preparation: The surface layer and core layer raw materials are separately hot-mixed at high speed (80-100℃), and the formulas are independent and not mixed; two or more extruders are used for individual temperature control, with the core PVC controlled at 170-185℃ and the surface high-hardness PVC controlled at 190-210℃. The four L-shaped galvanized steel sheet metal connectors, or the aluminum alloy strips on both sides, are precisely fixed in the corresponding cavities of the integrated rectangular frame co-extrusion mold using special positioning fixtures, with a positional deviation of ≤±0.5mm. S2 Multi-Material Synchronous Co-extrusion Molding: Multiple twin-screw extruders are used to separately convey molten rigid PVC window sash body material and rigid PVC strip material, and EPDM rubber sealing strip material can also be conveyed simultaneously. The two or three materials are extruded simultaneously through the flow channel of the co-extrusion die. The temperature and speed of each extruder are controlled to match, so that the PVC material completely wraps the metal connector's insert block and the barbed protrusions on both sides. Different melts are seamlessly heat-fused and bonded in the die, and extrusion molding is completed in one step. S3 Cooling and Shaping: The co-extruded window sash blank is cooled to room temperature through a vacuum sizing box and a three-stage water cooling tank. It is then cooled and shaped by a shaping mold to ensure flatness and dimensional accuracy, ensuring stable frame dimensions, no deformation, and strong bonding between the interfaces of various materials. S4 Corner Cutting: Using a CNC precision saw blade, make a cut at each of the four corners of the window sash at the preset process allowance position to remove excess burrs and process allowance, and obtain a complete window sash frame with the required dimensional accuracy. S5 functional component integration: The insulation layer can be filled into the insulation cavity of the window sash body through high-pressure injection process, butyl rubber shock-absorbing pads are composited in the glass mounting groove, and the beak-shaped water guide edge is formed in the drainage hole through cutting process. S6 Hardware Installation: Hinges, handles, and locking hardware accessories are directly fixed to the pre-made threaded holes of the pre-embedded metal connectors using stainless steel self-tapping screws; S7 Finished Product Inspection: After the assembled window sash and frame are assembled as a whole, flatness, air tightness, water tightness, wind pressure resistance and micro-ventilation volume are tested. After passing the test, the finished product is put into the warehouse.

[0014] The technical effects and advantages of this invention are as follows: This PVC co-extruded integrated window sash adopts a structure where pre-embedded L-shaped galvanized steel plate connectors are co-extruded and integrally formed with PVC. The barbed protrusions and embedded blocks fully combine with the molten PVC material during the co-extrusion process, forming a strong mechanical interlocking structure after cooling. This significantly improves the bonding force between the metal connectors and the PVC body compared to traditional post-installed corner brackets. Screws are directly screwed into the pre-drilled threaded holes on the metal connectors, avoiding drilling holes in the PVC profile. The connection strength is effectively improved, fully meeting the safety requirements of high-rise residential buildings and large-size window sashes. It fundamentally solves the safety hazards of traditional window sash weld cracking, screw loosening, and window sash detachment. The window sash body is formed in one piece through co-extrusion process without any welding seams, eliminating the weak point of strength and sealing of the weld seam, avoiding performance degradation caused by weld seam cracking, and the multi-chamber insulation structure is intact and undamaged, without thermal bridge effect caused by drilling and grooving, and the thermal insulation performance is effectively improved compared with traditional welded window sashes. The sealing strip fits the window frame better, making the window sash more water-tight and air-tight. The shock-absorbing pad with anti-slip protrusions can effectively absorb the impact energy of opening and closing the window, preventing the glass from breaking and shifting. The eagle-beak shaped one-way drain valve has a fast drainage speed and a good anti-backflow effect, while also blocking dust and insects from entering, significantly improving the comfort and service life of the window sash. This process eliminates the cumbersome steps of traditional fixed-length cutting, corner welding, weld grinding, and post-installation corner brackets, simplifying the production process to three core steps: co-extrusion molding, edge trimming, and hardware installation. The production efficiency of a single production line is significantly improved compared to traditional processes. This technology can seamlessly connect with fully automated production line equipment, achieving unmanned continuous production from raw material input to finished product output. It effectively solves the industry pain point of excessively high labor costs in the door and window industry, and significantly reduces labor costs. This PVC co-extruded one-piece molded window sash solves the problems of weld cracking and post-installation connectors damaging the structure and easily loosening in traditional welded window sashes, effectively improving the overall strength of the window sash. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a partial structural diagram of the window sash body of the present invention; Figure 3 This is a schematic diagram of the structure of the metal connector of the present invention; Figure 4 This is a schematic diagram of the window sash body of the present invention in a cut-out state; Figure 5 This is a schematic diagram of the structure of the window sash body and the one-way drain valve of the present invention; Figure 6 This is a schematic diagram of the structure of the shock-absorbing pad of the present invention in a cut-out state.

[0017] In the picture: 1. Window sash body; 2. Metal connector; 3. Embedded block; 4. Barbed protrusion; 5. Sealing strip; 6. Insulation layer; 7. Shock-absorbing pad; 8. Anti-slip protrusion; 9. Beak-shaped water guide edge. Detailed Implementation

[0018] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid obscuring the invention.

[0019] Unless otherwise defined, the directions mentioned herein, such as up, down, left, right, front, back, inside, and outside, are based on the directions shown in the figures of this invention, and are explained here together.

[0020] This invention provides, for example Figure 1-6 The PVC co-extruded one-piece molded window sash shown includes a window sash body 1 and metal connectors 2 disposed on both sides and four corners of the window sash body 1. The window sash body 1 has a double-layer co-extruded structure. The surface layer is a dense, non-foamed, high-hardness PVC, which is dense, smooth, scratch-resistant, waterproof, and moisture-proof. The core layer is a closed-cell foamed PVC, which is lightweight, sound-insulating, heat-insulating, and has excellent nail-holding power. The cross-section clearly shows the separation of the solid skin and the foamed core. It is integrally molded into a rectangular frame structure through a twin-screw co-extrusion process. Metal connectors 2 are pre-embedded on both sides and four corners of the window sash body 1, including L-shaped galvanized steel plate connectors pre-embedded at the four corners and aluminum alloy strip connectors pre-embedded on both sides. The galvanized steel plate connectors can effectively prevent rust from affecting the connection strength during long-term use. The overall structure is L-shaped, and the width matches the internal width of the window sash body 1 frame, ensuring that it can be accurately placed in the preset position of the co-extrusion mold. The two sides of the L-shape are pre-embedded in the two adjacent frames of the window sash body 1 to ensure sufficient connection length and bearing area. The aluminum alloy strip connectors are set along the entire length of the two side frames of the window sash to further enhance the firmness of the side hardware installation. The metal connector 2 has multiple through threaded holes, and the axis of the threaded holes is strictly perpendicular to the connection surface between the window sash body 1 and the window frame. This ensures that the screw is subjected to pure tensile force, preventing shear breakage. The metal connector 2 is used to connect to the window frame using stainless steel self-tapping screws. Embedded blocks 3 are symmetrically arranged on both sides of the metal connector 2. The embedded blocks 3 and the metal connector 2 are integrally stamped. The thickness of the embedded blocks 3 is the same as that of the metal connector 2, and the length matches the side length of the metal connector 2. Each embedded block 3 has multiple barbed protrusions 4 fixed on it. The barbed protrusions 4 are also integrally stamped, and the angle between them and the metal connector 2 is 30°. The 45° angle, tilted away from the threaded hole, is designed to generate maximum interlocking force when the PVC material cools and shrinks, while avoiding obstruction of PVC material flow during co-extrusion. The barbed protrusions 4 and the insert block 3 are fully embedded in the PVC material of the window sash body 1. During co-extrusion, the molten PVC material will fully fill all the gaps between the barbed protrusions 4. After cooling and shrinking, a tight three-dimensional mechanical interlocking structure is formed, making the bonding force between the metal connector 2 and the window sash body 1 much higher than that of traditional post-installed metal corner brackets. The edge of the threaded hole is chamfered to facilitate screw insertion and avoid stress concentration. The outer edge of the window sash body 1 is integrally formed with a dovetail-shaped fixing groove. A sealing strip 5 is snapped and fixed in the fixing groove. The sealing strip 5 is made of weather-resistant EPDM rubber. The cross-section of the sealing strip 5 has a three-chamber structure, which can absorb the assembly error between the window frame and the window sash and the thermal expansion and contraction caused by temperature changes through the elastic deformation of the chamber. The contact surface between the lip and the window frame is provided with fine diamond anti-slip texture, which can evenly distribute the sealing pressure across the entire contact surface, while increasing friction and preventing the sealing strip from shifting during the opening and closing of the window. The interior of the window sash body 1 is equipped with multiple independent insulation cavities. The cavities are separated by PVC partitions, which can effectively block the thermal bridge effect and air convection. The insulation cavities are filled with insulation layer 6. The insulation layer 6 can be made of polyurethane foam material or extruded polystyrene foam material with a closed-cell rate of not less than 90%. It is filled into the insulation cavity by high pressure injection, with a filling rate of not less than 95%. Alternatively, it can be sealed at both ends to achieve air insulation and avoid the decrease in insulation performance caused by air convection in the cavity. The inner side of the window sash body 1 is provided with an installation groove. The size of the installation groove can be set according to actual use needs and can be adapted to various specifications of insulated glass and laminated glass. The inner wall of the installation groove is fixed with a shock-absorbing pad 7 by means of environmentally friendly neutral silicone structural adhesive. The adhesive area is not less than 90% of the total area of ​​the shock-absorbing pad to ensure a firm bond. The shock-absorbing pad 7 is made of butyl rubber, which has good shock absorption and buffering performance and can absorb most of the impact energy of opening and closing the window. Multiple hemispherical anti-slip protrusions 8 are integrally formed on the inner wall of the shock-absorbing pad 7. The anti-slip protrusions 8 can increase the friction coefficient with the glass surface, prevent the glass from shifting in the horizontal direction, and at the same time evenly transfer the weight of the glass to the window sash body to avoid local stress concentration that could cause the glass to break. Multiple drainage holes are provided at the bottom of the window sash body 1. The drainage holes are evenly distributed along the width of the window sash, and the lowest position of the drainage hole is 2mm lower than the bottom of the mounting groove to ensure that the water in the groove can be completely drained without any water residue. The edge of the drainage hole is processed by cutting process to form a beak-shaped water-draining edge 9, which can only drain water outward, effectively preventing outdoor rainwater from flowing back in and dust and mosquitoes from entering the room.

[0021] The specific implementation steps of the production process are as follows: Mold and material preparation: A high-precision CNC-machined integrated co-extrusion mold is used, which integrates the window sash body cavity 1, the rigid PVC strip cavity, the sealing strip co-extrusion channel 5, and the metal connector positioning fixtures. The surface layer and core layer raw materials are separately hot-mixed at high speed (80-100℃), and the formulas are independent and not mixed. Two or more extruders are used for individual temperature control, with the core PVC controlled at 170-185℃ and the surface high-hardness PVC controlled at 190-210℃. The aluminum alloy strip is placed on the corresponding cavities on both sides of the window sash, or 4 L-shaped galvanized steel sheet metal connectors 2 are precisely fixed to the four corners of the mold by positioning pins, with a positional deviation of ≤±0.5mm, to ensure that no displacement occurs during the co-extrusion process. Multi-material synchronous co-extrusion molding: Multiple twin-screw extruders are used to separately convey molten rigid PVC window sash body material and rigid PVC strip material, and can also simultaneously convey EPDM rubber sealing strip material. The simultaneous extrusion of two or three materials is achieved through the diversion channel of the co-extrusion die. The temperature and speed of each extruder are controlled to match, so that the PVC material completely wraps the embedded block 3 of the metal connector 2 and the barbed protrusions 4 on both sides. Different melts are seamlessly hot-melted and bonded in the die, and extrusion molding is completed in one step. Cooling and shaping: The co-extruded window sash blank is cooled to room temperature through a vacuum sizing box and a three-stage water cooling tank. It is then cooled and shaped by a shaping mold to ensure flatness and dimensional accuracy, ensuring that the frame dimensions are stable and free from deformation, and that the interfaces of each material are firmly bonded. Corner trimming: Use a CNC precision saw to make a cut at each of the four corners of the window sash at the preset process allowance position to remove excess burrs. The trimming accuracy is controlled within ±0.5mm, and no weld grinding is required. Functional component integration: Polyurethane foam material can be injected into the insulation cavity using a high-pressure foaming machine to ensure full filling, or air insulation can be achieved by sealing both ends. In the glass mounting groove, online co-extrusion composite butyl rubber shock-absorbing pads 7 are used, and the edge of the drainage hole is processed by CNC cutting to form the beak-shaped water guide edge 9. Hardware installation: Use an automatic screwdriver to screw stainless steel self-tapping screws into the pre-made threaded holes of the pre-embedded metal connector 2, and install hardware accessories such as hinges, handles, and locking points. The screw torque should be controlled at 3-5 N·m to avoid stripping the threads. Finished product inspection: Flatness, air tightness, water tightness, and wind pressure resistance are tested according to national standards. At the same time, micro-ventilation volume and hardware connection strength are tested. The assembled window sash and window frame are inspected as a whole. After all indicators pass, they are labeled and put into storage.

[0022] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts and rivets that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0023] In the description of this invention, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0024] Working principle: This PVC co-extruded integrated window sash adopts an integrated structure of pre-embedded metal connectors 2 and PVC co-extruded integral molding. The barbed protrusions 4 and the embedded blocks 3 are fully combined with the molten PVC material during the co-extrusion process. After cooling, they form a strong mechanical interlocking structure, which greatly improves the bonding strength between the metal connectors 2 and the PVC body compared with the traditional post-installed metal corner brackets. The screws are directly screwed into the pre-made threaded holes on the metal connectors 2, avoiding drilling holes in the PVC profile. The connection strength is effectively improved, which fully meets the safety requirements of high-rise residential buildings and large-size window sashes. It fundamentally solves the safety hazards of traditional window sash weld cracking, screw loosening, and window sash falling off. The window sash body 1 is formed in one piece through a double-layer co-extrusion process without any welding seams, eliminating the weak point of strength and sealing of the weld seam and avoiding performance degradation caused by weld seam cracking. The high-hardness PVC surface layer improves the scratch resistance, wear resistance and waterproof performance of the window sash. The closed-cell foam core layer further optimizes the thermal insulation and sound insulation effect. The multi-chamber thermal insulation structure is intact and undamaged, without the thermal bridge effect caused by drilling and grooving. The thermal insulation performance is effectively improved compared with traditional welded window sashes. It abandons the traditional cumbersome processes such as fixed-length cutting, corner welding, weld grinding, and post-installation of corner brackets, and simplifies the production process to three core steps: co-extrusion molding, edge and corner cutting, and hardware installation. The production efficiency of a single production line is greatly improved compared with the traditional process. This process can be seamlessly connected to fully automated production line equipment to realize unmanned continuous production from raw material input to finished product output. It effectively solves the industry pain point of excessive labor in the door and window industry and greatly reduces labor costs. During the co-extrusion process, the window sash body 1 simultaneously forms the outer dovetail-shaped sealing strip 5 fixing groove, the internal multi-chamber insulation structure, and the inner mounting groove. After cooling and shaping, the frame processing can be completed by cutting the four corners, without the need for corner welding and grinding. Subsequently, high-pressure injection process is used to fill each independent insulation cavity with polyurethane foam or polystyrene foam insulation material with a high closed-cell rate, or directly seal both ends to form an air insulation layer, effectively blocking heat transfer. The EPDM sealing strip 5 with a multi-chamber structure is inserted into the dovetail-shaped fixing groove. The anti-slip texture on the lip of the sealing strip 5 can increase the contact friction with the window frame, so that the sealing pressure is evenly distributed and the overall sealing effect is improved. A butyl rubber shock-absorbing pad 7 is pasted on the inner wall of the installation groove. The hemispherical anti-slip protrusions 8 on the shock-absorbing pad 7 can increase the friction coefficient with the glass, prevent the glass from shifting horizontally during the opening and closing of the window, and absorb the impact energy generated by opening and closing the window through its own elastic deformation, protecting the glass from damage. An eagle beak water guide edge 9 is processed on the edge of the drainage hole at the bottom of the window sash to achieve one-way drainage by gravity, preventing rainwater backflow and mosquitoes from entering. During installation, the stainless steel self-tapping screws are directly screwed into the threaded holes on the metal connector 2 through the pre-drilled holes on the window frame. Since the axis of the threaded hole is strictly perpendicular to the connection surface, the screws only bear pure tensile force, and the stress state is reasonable, which can achieve a firm and reliable connection between the window sash and the window frame.

[0025] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A PVC co-extruded integrally molded window sash, comprising a window sash body (1) and metal connectors (2) disposed on both sides and four corners of the window sash body (1), characterized in that: The window sash body (1) is a double-layer co-extruded structure. The surface layer is a dense, non-foamed, high-hardness PVC, and the core layer is a closed-cell foamed PVC. The cross-section shows obvious separation between the solid skin and the foamed core. It is integrally formed into a rectangular frame through a co-extrusion process. The metal connector (2) includes L-shaped galvanized steel plate connectors embedded in the four corners and aluminum alloy strip connectors embedded in both sides. Both types of connectors are embedded in the corresponding positions of the window sash body (1) for connection with the window frame by screws. Embedded blocks (3) are symmetrically arranged on both sides of the metal connector (2), and multiple barbed protrusions (4) are fixed on the embedded blocks (3). The barbed protrusions (4) and the embedded blocks (3) are completely embedded in the PVC material of the window sash body (1). Multiple through threaded holes are opened on the metal connector (2), and the axis of the threaded holes is perpendicular to the connection surface between the window sash body (1) and the window frame.

2. The PVC co-extruded integrally molded window sash according to claim 1, characterized in that: The outer edge of the window sash body (1) is integrally formed with a fixing groove, and a sealing strip (5) is fixed in the fixing groove. The interior of the window sash body (1) can be provided with multiple independent heat preservation cavities, and the heat preservation cavities can be filled with heat preservation material (6).

3. A PVC co-extruded integrally molded window sash according to claim 2, characterized in that: The inner side of the window sash body (1) may be provided with an installation groove, and a shock-absorbing pad (7) is fixed on the inner wall of the installation groove. Multiple anti-slip protrusions (8) are integrally formed on the inner wall of the shock-absorbing pad (7).

4. A PVC co-extruded integrally molded window sash according to claim 3, characterized in that: The bottom of the window sash body (1) is provided with an eagle beak-shaped water inlet edge (9).

5. A PVC co-extruded integrally molded window sash according to claim 1, characterized in that: The angle between the barbed protrusion (4) and the metal connector (2) is 30-45°, and it is inclined in the direction away from the threaded hole.

6. A PVC co-extruded integrally molded window sash according to claim 2, characterized in that: The sealing strip (5) is made of EPDM rubber, with a multi-chamber structure in cross section, and the lip of the sealing strip (5) has anti-slip texture on the contact surface with the window frame.

7. A PVC co-extruded integrally molded window sash according to claim 2, characterized in that: The insulation layer (6) is made of polyurethane foam or polystyrene foam and is filled into the insulation cavity by high pressure injection. It can also be sealed at both ends to achieve air insulation.

8. A PVC co-extruded integrally molded window sash according to claim 4, characterized in that: The eagle beak water intake edge (9) is made using a cutting process and can only draw water outwards.

9. A manufacturing process for a PVC co-extruded integrally molded window sash as described in any one of claims 1-8, characterized in that, Includes the following steps: S1 mold and material preparation: The surface layer and core layer raw materials are separately hot-mixed at high speed (80-100℃), and the formulas are independent and not mixed; two or more extruders are used for individual temperature control, with the core PVC controlled at 170-185℃ and the surface high-hardness PVC controlled at 190-210℃. Four L-shaped galvanized steel sheet metal connectors (2) formed by stamping, or aluminum alloy strips on both sides, are precisely fixed in the corresponding cavity of the integrated rectangular frame co-extrusion mold by special positioning fixtures, with a positional deviation of ≤ ±0.5mm; S2 Multi-material Synchronous Co-extrusion Molding: Multiple twin-screw extruders are used to transport molten rigid PVC window sash body material and rigid PVC strip material respectively. EPDM rubber sealing strip (5) material can also be transported simultaneously. The two or three materials are extruded simultaneously through the diversion channel of the co-extrusion mold. The temperature and speed of each extruder are controlled to match, so that the PVC material completely wraps the metal connector (2) embedding block (3) and the barbed protrusions (4) on both sides. Different melts are seamlessly heat-fused and bonded in the mold, and extruded in one step. S3 Cooling and Shaping: The co-extruded window sash blank is cooled to room temperature through a vacuum sizing box and a three-stage water cooling tank. It is then cooled and shaped by a shaping mold to ensure flatness and dimensional accuracy, ensuring stable frame dimensions, no deformation, and strong bonding between the interfaces of various materials. S4 Corner Cutting: Using a CNC precision saw blade, make a cut at each of the four corners of the window sash at the preset process allowance position to remove excess burrs and process allowance, and obtain a complete window sash frame with the required dimensional accuracy. S5 Functional Component Integration: The insulation layer (6) can be filled into the insulation cavity of the window sash body (1) through high pressure injection process, the butyl rubber shock-absorbing pad (7) is composited in the glass mounting groove, and the beak-shaped water-guiding edge (9) is formed in the drainage hole through cutting process. S6 Hardware Installation: Hinges, handles, and locking hardware accessories are directly fixed to the pre-made threaded holes of the pre-embedded metal connector (2) using stainless steel self-tapping screws; S7 Finished Product Inspection: After the assembled window sash and frame are assembled as a whole, flatness, air tightness, water tightness, wind pressure resistance and micro-ventilation volume are tested. After passing the test, the finished product is put into the warehouse.

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