A cover pre-treatment system for jacquard threads

Abstract

The utility model discloses a kind of coating pretreatment systems of jacquard thread belongs to jacquard thread production equipment technical field.The system includes the guide yarn leading-in mechanism, heat treatment mechanism and vacuumizing mechanism sequentially arranged along guide yarn conveying direction.The guide yarn leading-in mechanism is used to tension and horizontally lead-in after twisting guide yarn;The heat treatment mechanism includes a multilayer composite heating pipe, for the high-temperature treatment to guide yarn to remove surface grease;The vacuumizing mechanism is located between heat treatment mechanism and coating device, for removing grease volatiles and forming negative pressure environment before guide yarn enters coating device.The system efficiently removes process grease on the surface of polyester jacquard thread by physical method, can significantly improve the bonding force of subsequent coating layer and thread body, thereby enhancing the wear resistance and service life of jacquard thread, and process environmental protection, easy to continuous production.

Description

Technical Field

[0001] This utility model relates to the technical field of jacquard yarn production equipment, and more specifically to a pre-treatment system for coating jacquard yarn. Background Technology

[0002] Jacquard yarn (also known as threaded yarn) is one of the main components of the shedding device in a jacquard loom. During the high-speed operation of the jacquard loom, the jacquard yarn undergoes a high-speed up-and-down pulling motion. In this reciprocating motion, the jacquard yarn is under tension due to the force, which generates friction between it and the jacquard stencil and the base plate above it. This rapid friction generates a large amount of heat between the jacquard yarn and the jacquard stencil and the base plate above it. This accelerates the deterioration of the jacquard yarn's performance and affects its service life on the loom.

[0003] After twisting polyester filaments, coating their surface with a coating can improve the abrasion resistance of polyester jacquard yarn. However, during the spinning process, the surface of the polyester filaments contains high-molecular-weight greases that act as lubricants. The presence of these greases can affect the subsequent coating process, reducing the adhesion between the coating and the polyester jacquard yarn and thus affecting its service life.

[0004] Therefore, it is necessary to perform effective pretreatment on the jacquard yarn (through yarn) before the coating process to remove the grease on its surface, improve the adhesion of the subsequent coating, and thus enhance the wear resistance and service life of the product. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a pretreatment system for jacquard yarn coating. By adding heat treatment and vacuuming processes before the polyester yarn coating process, the grease on the surface of the polyester yarn is removed, and the adhesion between the polyester yarn and the coating is improved, thereby greatly improving the wear resistance and service life of the jacquard yarn.

[0006] The technical solution adopted by this utility model to solve the technical problem is: a pretreatment system for covering jacquard yarn, the treatment system including a yarn guiding mechanism, a heat treatment mechanism and a vacuuming mechanism arranged sequentially along the yarn conveying direction; the yarn guiding mechanism is used to transport the twisted yarn to the heat treatment mechanism; the heat treatment mechanism is used to perform high-temperature treatment on the twisted yarn to remove grease from the yarn surface; the vacuuming mechanism is located between the heat treatment mechanism and the covering device.

[0007] Furthermore, the yarn guiding mechanism includes several guide wheels and tension wheels; the guide wheels are used to horizontally convey the twisted yarn; the tension wheels are used to straighten the twisted yarn.

[0008] Furthermore, the heat treatment mechanism includes a heating tube and a controller; the controller is used to control and display the heating temperature inside the heating tube; the heating tube has a multi-layer composite structure, and the heating tube includes a heating layer, a heat insulation layer and a metal outer layer from the inside to the outside, and heating wires are evenly distributed on the heating layer.

[0009] Furthermore, the heating tube has a hollow long cylindrical structure; the length of the heating tube ranges from 1 to 1.5 m.

[0010] Furthermore, the vacuuming mechanism includes a three-way connector, a sealing cap, and a vacuum pump; the first port of the three-way connector is connected to the sealing cap, the second port of the three-way connector is connected to the covering device, and the third port of the three-way connector is connected to the vacuum pump through a pipe.

[0011] Furthermore, one end of the sealing cap is detachably connected to the first port of the three-way connector, and the other end of the sealing cap has a through hole for the through wire to pass through.

[0012] The beneficial effects of this utility model are as follows: Compared with the prior art, the jacquard thread pretreatment system provided by this utility model has the following advantages: 1) A heat treatment mechanism is set up to perform controlled high-temperature treatment on the twisted jacquard yarn, which can directly and effectively evaporate or decompose the residual process grease on its surface by heat, fundamentally eliminating the key obstacle affecting coating adhesion. The physical bonding and chemical affinity between the jacquard yarn and the subsequent coating material are greatly improved after this pretreatment.

[0013] 2) A vacuum system is installed after the heat treatment unit and before the coating unit to create a negative pressure transition environment. This design can quickly extract and discharge the volatile oils generated during the heat treatment process, ensuring the durability and stability of the pretreatment effect; on the other hand, it can also prevent air from entering and affecting the subsequent coating process.

[0014] 3) The wire guiding mechanism ensures smooth and straight wire transmission; the multi-layer composite heating tube provides excellent insulation, uniform temperature, and precise control; the vacuuming mechanism features a clever connection method and excellent sealing. The entire processing system can be continuously integrated with upstream and downstream processes online, achieving automated continuous production and improving overall production efficiency and process stability. Attached Figure Description

[0015] Figure 1 A simplified structural diagram of the pretreatment system provided by this utility model.

[0016] Figure 2 This is a schematic diagram of the cross-sectional structure of the heating tube in this utility model.

[0017] Figure 3 This is a simplified structural diagram of the tee connector and sealing cap in this utility model.

[0018] Among them, 1-wire guiding mechanism; 11-guide wheel; 12-tensioning wheel; 2-wire guiding; 3-heat treatment mechanism; 31-heating tube; 313-heating layer; 312-insulation layer; 311-metal outer layer; 32-controller; 4-vacuuming mechanism; 41-tee connector; 42-sealing cover; 421-through hole; 43-vacuum pump; 5-coating device. Detailed Implementation

[0019] To facilitate understanding of this utility model, a more comprehensive description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0020] like Figures 1 to 3 As shown, this embodiment provides a pre-treatment system for jacquard yarn coating, mainly used to effectively remove residual grease from the surface of the jacquard yarn (i.e., the through yarn) before it enters the coating device 5 for surface coating, so as to ensure that the subsequent coating has excellent adhesion and durability. It should be noted that since the coating device 5 is not the main protected subject of this utility model, it has been simplified in the drawings. The coating device in actual production can be a compounding extrusion device.

[0021] The entire system is arranged sequentially along the wire conveying direction, mainly including the wire guiding mechanism 1, the heat treatment mechanism 3, and the vacuuming mechanism 4.

[0022] Jacquard yarn guiding mechanism 1: Located at the front end of the system, this mechanism is responsible for smoothly and tautly guiding the jacquard yarn twisted in the upstream process into the subsequent processing unit. It typically includes multiple guide rollers 11 and at least one tensioning roller 12. The guide rollers 11 are arranged in a specific layout to transform the jacquard yarn 2 from an inclined or vertical feeding direction into a stable horizontal conveying path. The tensioning roller 12 applies appropriate tension to the jacquard yarn 2, keeping it straight during conveying, preventing slack or knotting, and ensuring it passes straight through the subsequent heat treatment mechanism 3.

[0023] Heat treatment mechanism 3: The heat treatment mechanism 3 is the core unit for removing grease from the surface of the wire 2. Its main body is a horizontally positioned hollow cylindrical heating tube 31, with a length of 1 to 1.5 meters. In this embodiment, a length of 1.2 meters is selected to ensure sufficient heating time for the wire 2. The heating tube 31 adopts a multi-layer composite structure, consisting of, from the inside out: a heating layer 313, an insulation layer 312, and a metal outer layer 311. Electric heating wires are uniformly wound or arranged on the inner wall or inside of the heating layer 313 as a heat source. The insulation layer 312 wraps around the heating layer 313 to reduce heat loss, improve thermal efficiency, and maintain a stable temperature inside the tube; the insulation layer 312 can be filled with asbestos. The outermost metal outer layer 311 provides protection and support; in this embodiment, a stainless steel shell is used. Furthermore, the heat treatment mechanism 3 is equipped with an independent controller 32, which is used to precisely set, adjust, and display the temperature inside the heating tube 31 in real time. When the taut and straightened wire 2 passes horizontally through the high-temperature heating tube 31, the polymer oils adhering to its surface evaporate or decompose due to the heat, thus being effectively removed.

[0024] Vacuum pumping mechanism 4: The vacuum pumping mechanism 4 is located at the junction after the heat treatment mechanism 3 and before the coating device 5. It mainly includes a three-way connector 41, a sealing cap 42, and a vacuum pump 43. The second port of the three-way connector 41 is connected to the subsequent coating device 5 via a pipeline. Its first port is detachably connected to one end of the sealing cap 42 (e.g., via a thread or flange). The other end of the sealing cap 42 has a small through hole 421 at its center for the heat-treated wire 2 to pass through. A dynamic sealing structure can be used between the through hole 421 and the wire 2 to reduce air leakage. The third port of the three-way connector 41 is connected to the vacuum pump 43 via a pipeline. After the vacuum pump 43 is started, it will generate negative pressure (vacuum or low-pressure environment) in the chamber formed by the sealing cap 42, the three-way connector 41, and the inlet of the coating device 5. This design has a dual function: firstly, it can promptly remove the volatile oils generated during the heat treatment process, preventing them from re-condensing on the surface of the wire 2 or contaminating the equipment, and preventing air from entering the subsequent coating device 5 during the conveying process; secondly, before the wire 2 enters the coating device 5, its surface is in a clean and highly active state, and the negative pressure environment helps the subsequent coating materials (such as coating slurry or melt) to better wet and adhere to the surface of the wire 2.

[0025] The workflow of the pretreatment system provided by this utility model is as follows: The twisted jacquard yarn is first guided and tensioned by the yarn guide mechanism 1 to form a stable and straight conveying state. Subsequently, the yarn 2 is fed into the heating tube 31 of the heat treatment mechanism 3 and passes through at a set high temperature (precisely controlled by the controller), where the surface grease is thermally decomposed or evaporated. After leaving the heating tube 31, the yarn 2 immediately enters the negative pressure transition area created by the vacuum mechanism 4, where the volatiles are removed, and the surface of the yarn 2 is cleaned and activated. Finally, the treated clean yarn is directly fed into the downstream coating device 5 through the three-way connector 41 for surface coating.

[0026] This invention utilizes a physical pretreatment method combining heat treatment and vacuuming to efficiently and environmentally remove grease from the surface of jacquard yarn without the use of chemical solvents. This significantly improves the bonding strength between the coating and the yarn substrate, thereby ultimately enhancing the wear resistance and overall service life of the jacquard yarn.

[0027] The above embodiments are only used to illustrate the present utility model and are not intended to limit the present utility model. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present utility model. Therefore, all equivalent technical solutions also fall within the scope of the present utility model. The patent protection scope of the present utility model should be defined by the claims.

Claims

1. A pretreatment system for covering jacquard yarn, characterized in that: The processing system includes a wire guiding mechanism, a heat treatment mechanism, and a vacuuming mechanism arranged sequentially along the wire conveying direction; the wire guiding mechanism is used to transport the twisted wire to the heat treatment mechanism; the heat treatment mechanism is used to perform high-temperature treatment on the twisted wire to remove grease from the wire surface; the vacuuming mechanism is located between the heat treatment mechanism and the coating device.

2. The jacquard thread pretreatment system as described in claim 1, characterized in that: The yarn guiding mechanism includes several guide wheels and tension wheels; the guide wheels are used to horizontally transport the twisted yarn; the tension wheels are used to straighten the twisted yarn.

3. The jacquard thread pretreatment system as described in claim 1, characterized in that: The heat treatment mechanism includes a heating tube and a controller; the controller is used to control and display the heating temperature inside the heating tube; the heating tube has a multi-layer composite structure, and the heating tube includes a heating layer, a heat insulation layer and a metal outer layer from the inside to the outside, and heating wires are evenly distributed on the heating layer.

4. The jacquard thread pretreatment system as described in claim 3, characterized in that: The heating tube has a hollow, long cylindrical structure; the length of the heating tube ranges from 1 to 1.5 m.

5. The pretreatment system for covering jacquard thread as described in claim 1, characterized in that: The vacuuming mechanism includes a three-way connector, a sealing cap, and a vacuum pump; the first port of the three-way connector is connected to the sealing cap, the second port of the three-way connector is connected to the covering device, and the third port of the three-way connector is connected to the vacuum pump through a pipe.

6. The jacquard thread pretreatment system as described in claim 5, characterized in that: One end of the sealing cap is detachably connected to the first port of the three-way connector, and the other end of the sealing cap has a through hole for the through wire to pass through.

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