Bidirectional stretching machine for ultra-high molecular weight polyethylene film

Abstract

The utility model belongs to the technical field of polyethylene film processing, and particularly relates to a two-way stretching machine for an ultra-high molecular weight polyethylene film, which comprises a stretching shell and a heating shell, the heating shell is fixedly connected above the stretching shell, a stretching mechanism is mounted on the inner side of the stretching shell, the stretching mechanism comprises a stretching unit and a heating unit, and the heating unit is connected with the stretching unit. The stretching unit is installed on the inner side of the stretching shell, and the heating unit is installed on the inner side of the stretching shell. According to the two-way stretching machine for the ultra-high molecular weight polyethylene film, after a heating unit is installed and then the polyethylene film is wound, when the film needs to be stretched, an electric heating bent pipe is started, and hot air generated on the surface of the electric heating bent pipe is further blown to the surface of the film through an air blowing electric fan, so that the film is conveniently stretched; the thin film is located at the top of the stretching roller, the thin film is further heated by further starting the electric heating coil, and meanwhile, a follow-up stretching unit is assisted to stretch the thin film.

Description

Technical Field

[0001] This utility model relates to the field of polyethylene film processing technology, specifically to a biaxial stretching machine for ultra-high molecular weight polyethylene film. Background Technology

[0002] Ultra-high molecular weight polyethylene (UHMWPE) film, with its superior physicochemical properties, has become an important component in the field of high-performance materials. Based on its ultra-long molecular chain structure, this material exhibits high strength (tensile strength up to 3-3.5 GPa) and high modulus (elastic modulus exceeding 100 GPa), while also possessing excellent wear resistance (coefficient of friction as low as 0.05-0.1) and chemical stability, maintaining structural integrity even in strong acids, strong alkalis, and various organic solvents. Its unique properties make it suitable for manufacturing lightweight, high-strength composite components in the aerospace field; for producing bulletproof vests and armor protection materials in the defense industry; for highly biocompatible devices such as artificial joints and medical catheters in the medical field; and for sports equipment such as skis and fishing lines, where extremely high strength and wear resistance are required, demonstrating enormous industrial application potential and strategic value.

[0003] Currently available biaxial stretching equipment and processes are mostly designed for low-viscosity plastic films such as ordinary polyethylene and polypropylene. Their heating methods, tensile stress control, and cooling mechanisms are ill-suited to the unique rheological properties of ultra-high molecular weight polyethylene (UHMWPE) melt. Due to the severe molecular chain entanglement and poor melt flowability of UHMWPE, traditional equipment easily encounters three major technical bottlenecks during stretching: first, localized stress concentration leads to a film breakage rate as high as 15%-20%; second, the imbalance between the temperature field and the stretching rate causes film thickness deviations exceeding ±10μm; and third, insufficient molecular chain orientation induction efficiency results in longitudinal and transverse mechanical property differences exceeding 30%. The limitations of existing technology have become a core obstacle restricting the large-scale application of UHMWPE films in high-end fields such as aerospace and defense. Therefore, there is an urgent need to develop specialized biaxial stretching equipment and supporting processes that combine precise temperature control, gradient stretching, and dynamic cooling. Utility Model Content

[0004] The purpose of this invention is to provide a biaxial stretching machine for ultra-high molecular weight polyethylene film to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a biaxial stretching machine for ultra-high molecular weight polyethylene film, comprising a stretching shell and a heating shell, wherein the heating shell is fixedly connected to the top of the stretching shell, and a stretching mechanism is installed on the inner side of the stretching shell, wherein the stretching mechanism comprises a stretching unit and a heating unit, wherein the stretching unit is installed on the inner side of the stretching shell, and the heating unit is installed on the inner side of the stretching shell.

[0006] The heating unit includes a blower fan installed inside the heating housing. An energy component is fixedly connected to the bottom of the heating housing. An electric heating bend is connected to the outside of the energy component. A heating groove is provided inside the stretching housing. A stretching roller is provided inside the stretching housing. A heating cavity is provided inside the stretching roller. An electric heating coil is provided inside the heating cavity.

[0007] Preferably, an auxiliary rod is provided on the inner side of the stretching shell.

[0008] Preferably, the outer surface of the stretching roller is a smooth surface, and the material of the stretching roller is a thermally conductive material.

[0009] Preferably, the stretching unit includes a central shaft, which is installed inside the stretching housing. A rotating plate is movably connected to the outer surface of the central shaft. A connecting shaft one is movably connected to the inner side of the rotating plate. An electric telescopic rod is connected to the outer surface of the connecting shaft one. A connecting shaft two is connected to the end of the rotating plate away from the connecting shaft one. A condensate storage tank assembly is provided on the outer side of the stretching housing. A transfer pipe is connected to the condensate storage tank assembly. A cooling roller is connected to the other end of the transfer pipe. A cooling cavity is formed on the inner side of the cooling roller. A moving groove is formed on the inner side of the stretching housing.

[0010] Preferably, the outer surface of the connecting shaft is connected to the stretching roller.

[0011] Preferably, the second connecting shaft moves inside the moving groove.

[0012] Preferably, a transport pump is provided inside the condensate storage tank assembly.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. This biaxial stretching machine for ultra-high molecular weight polyethylene film, after installing a heating unit to wind the polyethylene film, further stretches the film by activating an electric heating bend tube and blowing hot air generated on the surface of the electric heating bend tube onto the film surface through a blower fan, thereby facilitating film stretching. The film is then positioned on top of the stretching roller, and the film is further heated by activating an electric heating coil, which assists the subsequent stretching unit in stretching the film.

[0015] 1. This biaxial stretching machine for ultra-high molecular weight polyethylene film adopts a combination structure of a rotating plate and an electric telescopic rod in the stretching unit, which can achieve precise stretching of the film and effectively control the thickness and orientation of the film. At the same time, the setting of cooling roller and condensate circulation system can quickly cool and shape the stretched film, reduce film shrinkage and deformation, and improve the dimensional stability of the film. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the bottom structure of this utility model;

[0018] Figure 3 This is a cross-sectional view of the internal structure of the tensile shell of this utility model;

[0019] Figure 4 This is a cross-sectional view of the tensile unit structure of this utility model.

[0020] In the diagram: 1. Stretching shell; 2. Heating shell; 3. Electric fan; 4. Energy component; 5. Electric heating bend; 6. Heating tank; 7. Auxiliary roller; 8. Stretching roller; 9. Heating chamber; 10. Electric heating coil; 11. Connecting shaft one; 12. Electric telescopic rod; 13. Rotating plate; 14. Central shaft; 15. Connecting shaft two; 16. Condensate storage tank assembly; 17. Transfer pipe; 18. Moving tank; 19. Cooling roller; 20. Cooling chamber. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figures 1-4This utility model provides a technical solution: a biaxial stretching machine for ultra-high molecular weight polyethylene film, including a stretching shell 1 and a heating shell 2. The heating shell 2 is fixedly connected to the top of the stretching shell 1. A stretching mechanism is installed on the inner side of the stretching shell 1. The stretching mechanism includes a stretching unit and a heating unit. The stretching unit is installed on the inner side of the stretching shell 1, and the heating unit is installed on the inner side of the stretching shell 1.

[0023] The heating unit includes a blower fan 3, which is installed inside the heating housing 2. An energy component 4 is fixedly connected to the bottom of the heating housing 2, and an electric heating bend tube 5 is connected to the outside of the energy component 4. A heating groove 6 is opened on the inner side of the stretching housing 1, and a stretching roller 8 is provided on the inner side of the stretching housing 1. A heating chamber 9 is opened inside the stretching roller 8, and an electric heating coil 10 is provided inside the heating chamber 9. By installing the heating unit and then winding the polyethylene film, when it is necessary to stretch the film, the electric heating bend tube 5 is activated, and the blower fan 3 blows the hot air generated on the surface of the electric heating bend tube 5 to the surface of the film, which facilitates the stretching of the film. The film is then positioned on top of the stretching roller 8, and the electric heating coil 10 is activated to further heat the film, while also assisting the subsequent stretching unit in stretching the film.

[0024] An auxiliary roller 7 is provided on the inner side of the stretching housing 1, so that the film is brought into contact with the outer surface of the auxiliary roller 7 and then further wound around the outer surface of the stretching roller 8, thereby facilitating the stretching of the film.

[0025] The outer surface of the stretching roller 8 is smooth, and the material of the stretching roller 8 is a thermally conductive material, which facilitates the subsequent heating of the film.

[0026] The stretching unit includes a central shaft 14, which is installed inside the stretching housing 1. A rotating plate 13 is movably connected to the outer surface of the central shaft 14, and a connecting shaft 11 is movably connected to the inner side of the rotating plate 13. An electric telescopic rod 12 is connected to the outer surface of the connecting shaft 11. A connecting shaft 15 is connected to the end of the rotating plate 13 away from the connecting shaft 11. A condensate storage tank assembly 16 is provided on the outer side of the stretching housing 1. A transfer pipe 17 is connected to the condensate storage tank assembly 16. The other end of the transfer pipe 17 is connected to a cooling roller 19. A cooling chamber 20 is formed on the inner side of the cooling roller 19. A movable groove 18 is provided so that when the film is wound around the outer surface of the stretching roller 8 by installing the stretching unit, the electric telescopic rod 12 is activated, which drives the connecting shaft 11, thereby causing the rotating plate 13 to rotate around the central axis 14, thereby further stretching the film. The stretched film is then wound around the outer surface of the cooling roller 19, and the condensate inside the condensate storage tank assembly 16 is transferred to the interior of the cooling roller 19 through the transfer pipe 17, thereby reaching the interior of the cooling chamber 20, and then cooling the stretched film to ensure the quality of the film.

[0027] The outer surface of the connecting shaft 11 is connected to the stretching roller 8.

[0028] The connecting shaft 15 moves inside the moving groove 18.

[0029] A transport pump is installed inside the condensate storage tank assembly 16, thereby transferring the condensate inside the condensate storage tank assembly 16 to the inside of the transport pipe 17 via the transport pump.

[0030] Working Principle: The film is wound around the outer surface of the stretching roller 8 by the auxiliary roller 7. The stretching roller 8 is made of a thermally conductive material and has a smooth outer surface. When the heating unit is started, the electric heating bend 5 generates heat, and the blower fan 3 blows the hot air onto the film surface. At the same time, the electric heating coil 10 in the heating chamber 9 inside the stretching roller 8 further heats the film, facilitating subsequent stretching. The electric telescopic rod 12 of the stretching unit drives the connecting shaft 11, causing the rotating plate 13 to rotate around the central axis 14, thereby stretching the film. The stretched film is wound onto the outer surface of the cooling roller 19. The condensate in the condensate storage tank assembly 16 enters the cooling chamber 20 of the cooling roller 19 through the transfer pump and transfer pipe 17 to cool the film and ensure film quality. Throughout the process, the connecting shaft 15 moves within the moving groove 18, assisting in completing the stretching action.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A biaxial stretching machine for ultra-high molecular weight polyethylene film, comprising a stretching shell (1) and a heating shell (2), characterized in that: The heating shell (2) is fixedly connected to the top of the stretching shell (1). A stretching mechanism is installed on the inner side of the stretching shell (1). The stretching mechanism includes a stretching unit and a heating unit. The stretching unit is installed on the inner side of the stretching shell (1). The heating unit includes a blower fan (3), which is installed inside the heating housing (2). An energy component (4) is fixedly connected to the bottom of the heating housing (2). An electric heating bend (5) is connected to the outside of the energy component (4). A heating groove (6) is opened on the inside of the stretching housing (1). A stretching roller (8) is provided on the inside of the stretching housing (1). A heating cavity (9) is opened inside the stretching roller (8). An electric heating coil (10) is provided inside the heating cavity (9).

2. The biaxial stretching machine for ultra-high molecular weight polyethylene film according to claim 1, characterized in that: An auxiliary rod (7) is provided on the inner side of the stretching shell (1).

3. The biaxial stretching machine for ultra-high molecular weight polyethylene film according to claim 1, characterized in that: The outer surface of the stretching roller (8) is a smooth surface, and the material of the stretching roller (8) is a thermally conductive material.

4. The biaxial stretching machine for ultra-high molecular weight polyethylene film according to claim 1, characterized in that: The stretching unit includes a central shaft (14), which is installed on the inner side of the stretching housing (1). A rotating plate (13) is movably connected to the outer surface of the central shaft (14). A connecting shaft one (11) is movably connected to the inner side of the rotating plate (13). An electric telescopic rod (12) is connected to the outer surface of the connecting shaft one (11). A connecting shaft two (15) is connected to one end of the rotating plate (13) away from the connecting shaft one (11). A condensate storage tank assembly (16) is provided on the outer side of the stretching housing (1). A transfer pipe (17) is connected to the condensate storage tank assembly (16). A cooling roller (19) is connected to the other end of the transfer pipe (17). A cooling cavity (20) is opened on the inner side of the cooling roller (19). A moving groove (18) is opened on the inner side of the stretching housing (1).

5. A biaxial stretching machine for ultra-high molecular weight polyethylene film according to claim 4, characterized in that: The outer surface of the connecting shaft (11) is connected to the stretching roller (8).

6. A biaxial stretching machine for ultra-high molecular weight polyethylene film according to claim 4, characterized in that: The connecting shaft 2 (15) moves inside the moving groove (18).

7. A biaxial stretching machine for ultra-high molecular weight polyethylene film according to claim 4, characterized in that: A transport pump is provided inside the condensate storage tank assembly (16).

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