Liquid bridge welding method for fiber structure

Abstract

The invention provides a liquid bridge welding method of a fiber structure, which comprises the following steps: preparing a first fiber layer and a second fiber layer to obtain a multi-fiber layer, mixing a first solvent and a second solvent according to a volume ratio of (20: 1)-(30: 1) to obtain a liquid bridge solution, heating the bottom of a container, evaporating the first solvent firstly, wetting and permeating the first solvent to the surface of the multi-fiber layer to obtain a protective layer, then, a second solvent is evaporated and attached to the outer portion of the protection layer, the protection layer is dissolved, then the first fiber layer and the second fiber layer are dissolved, the joint or the adjacent position of the first fiber layer and the second fiber layer is liquefied to form a liquid bridge, and the liquid bridge is solidified after being heated to be connected with the first fiber layer and the second fiber layer to obtain a liquid bridge welded multi-fiber layer; the preparation method of the liquid bridge welding method of the fiber structure is completed. Through liquid bridge welding, the characteristics of ventilation, heat dissipation, comfort and attractiveness are reserved, and meanwhile multiple layers of fiber structures can be evenly connected.

Description

Technical Field

[0001] The present invention relates to the technical field essential for human life, and particularly to a liquid bridge welding method for a fiber structure. Background Art

[0002] In the modern textile field, the design of multi-layer structures has become a key means to enhance the performance and functions of textiles. By skillfully combining different materials, fibers, and fabric structures, multi-layer textiles can meet diverse application requirements, from daily clothing to high-performance industrial fabrics.

[0003] Generally, multi-layer structures are compounded by gluing or hot pressing, but the porosity cannot be controlled, resulting in poor air permeability; increasing the fiber thickness will increase the textile difficulty and cannot solve the problem of large porosity; while using multi-layer textile technology can reduce the porosity and ensure uniform air permeability, but the fixing method between multi-layer fibers has become a difficult problem.

[0004] Therefore, a method for fixedly connecting woven multi-layer fibers is needed. Summary of the Invention

[0005] The present invention is to solve the problem of connection between multi-layer fibers, and provides a liquid bridge welding method for a fiber structure. Through "liquid bridge welding", while retaining the characteristics of air permeability, heat dissipation, comfort, and beauty, the multi-layer fiber structure can be uniformly connected.

[0006] The present invention provides a liquid bridge welding method for a fiber structure, including the following steps:

[0007] S1. Prepare a first fiber layer and a second fiber layer, and overlap or cross the first fiber layer and the second fiber layer to obtain a multi-fiber layer;

[0008] The materials of the first fiber layer and the second fiber layer are any one of the following: nylon, polyester, spandex, acrylic, polypropylene, polystyrene, polyvinyl alcohol, polyamide, cellulose nanofibers, and micro-nanofibers;

[0009] S2. Mix a first solvent and a second solvent according to a volume ratio of 20:1 to 30:1 to obtain a liquid bridge solution. The boiling point of the first solvent is lower than that of the second solvent, and the first solvent and the second solvent are mutually soluble;

[0010] Place the liquid bridge solution in a container at room temperature, and suspend the multi-fiber layer above the container;

[0011] S3. Heat the bottom of the container. The first solvent evaporates first and wets and penetrates the surface of the multi-fiber layer to obtain a protective layer. Subsequently, the second solvent evaporates and adheres to the outside of the protective layer, dissolves the protective layer and then dissolves the first fiber layer and the second fiber layer, causing the liquefaction of the junction or adjacent areas of the first fiber layer and the second fiber layer to form a liquid bridge. After the heating ends, the liquid bridge solidifies to connect the first fiber layer and the second fiber layer, and a multi-fiber layer after liquid bridge welding is obtained, thus completing a liquid bridge welding method for a fiber structure.

[0012] In the preparation method of the liquid bridge welding method for a fiber structure according to the present invention, as a preferred mode, the first solvent is dimethyl sulfoxide and the second solvent is m-cresol.

[0013] In step S3, during the heating to 210 °C, dimethyl sulfoxide evaporates first and adheres to the fibers of the first fiber layer and the second fiber layer without dissolving the fibers of the first fiber layer and the second fiber layer. Then m-cresol evaporates. After m-cresol is miscible with dimethyl sulfoxide, it dissolves the fibers of the first fiber layer and the second fiber layer and forms a liquid bridge at the junction of the first fiber layer and the second fiber layer. After the heating ends, the liquid bridge solidifies to obtain a multi-fiber layer after liquid bridge welding.

[0014] In the preparation method of the liquid bridge welding method for a fiber structure according to the present invention, as a preferred mode, the first fiber layer is a woven structure with pores, and the second fiber layer is interwoven in the first fiber layer, and the liquid bridge is formed at the intersection of the first fiber layer and the second fiber layer.

[0015] In the preparation method of the liquid bridge welding method for a fiber structure according to the present invention, as a preferred mode, the first fiber layer is a cylindrical structure, and the second fiber layer is cross-woven in the first fiber layer. In step S2, the multi-fiber layer is suspended and spread out and placed above the container.

[0016] In the preparation method of the liquid bridge welding method for a fiber structure according to the present invention, as a preferred mode, in step S1, the multi-fiber layer may include two or more fiber layers.

[0017] In the preparation method of the liquid bridge welding method for a fiber structure according to the present invention, as a preferred mode, in step S1, the first fiber layer and the second fiber layer may also be in a stacked state, and an external force that pulls and spreads around applied to the first fiber layer and the second fiber layer can make the first fiber layer and the second fiber layer contact evenly.

[0018] In the preparation method of the liquid bridge welding method for a fiber structure according to the present invention, as a preferred mode, the areas to be liquid bridge welded of the stacked first fiber layer and the second fiber layer are straightened to make the first fiber layer and the second fiber layer contact evenly.

[0019] The preparation method of a liquid bridge welding method for a fiber structure according to the present invention, as a preferred embodiment, further includes step S4 of washing the multi-fiber layer after liquid bridge welding multiple times to remove the remaining second solvent.

[0020] The preparation method of a liquid bridge welding method for a fiber structure according to the present invention, as a preferred embodiment, in step S1, the multi-fiber layer may include two or more fiber layers.

[0021] The present invention discloses a liquid bridge welding method for a fiber structure. The principle of liquid bridge welding is as follows:

[0022] Two mutually soluble good solvents and a bad solvent are mixed in a volume ratio range of 20:1 to 30:1 to prepare a new solution. At room temperature, the woven first fiber layer and second fiber layer are placed on top of the mixed solution, and then the mixed solution is heated. During the evaporation process of the mixed solution, the bad solvent evaporates first, protecting the woven structure. Subsequently, the good solvent evaporates, and the dissolved fiber components solidify after the heating ends, performing a "liquid bridge welding" function on the connection points between the yarns.

[0023] Steps of liquid bridge welding:

[0024] Step 1: Mix two mutually soluble good solvents and a bad solvent in a volume ratio range of 20:1 to 30:1 to prepare a new solution;

[0025] Step 2: Place the mixed solution in a container at room temperature, and spread and suspend the woven first fiber layer and second fiber layer above the container;

[0026] Step 3: Heat the bottom of the container. During the evaporation process of the mixed solution, the bad solvent evaporates first, protecting the woven structure. Subsequently, the good solvent evaporates, and the dissolved fiber components solidify after the heating ends, performing a "liquid bridge welding" function on the connection points between the yarns.

[0027] In the present invention, m-phenol solvent has the ability to dissolve synthetic fibers such as nylon. Its dissolution mechanism mainly stems from the strong polarity of m-phenol. It can interact with the polar groups in the fiber molecules and form hydrogen bonds, ionic bonds, or van der Waals forces and other interaction forces between the molecules. These interaction forces lead to changes in the molecular spacing and deformation of the molecular structure of synthetic fibers such as nylon, thereby achieving the dissolution effect. The solidified substance after dissolution can form a connection at the junction of nylon fibers and stocking fibers. On the other hand, dimethyl sulfoxide solvent, as a "universal solvent", can be miscible with m-phenol solvent but does not have solubility in fibers such as nylon (its protective effect lies in the insolubility of dimethyl sulfoxide solvent in nylon fibers, thus preventing the fibers from being over-dissolved by m-phenol solvent).

[0028] The present invention has the following advantages:

[0029] The present invention discloses a liquid bridge welding method for a fiber structure. The micro-nano braided structure of "liquid bridge welding" effectively retains the original air permeability, heat dissipation, comfort and beauty characteristics of the tubular braided structure, and performs firm bonding, so that multiple braided structures are firmly bonded together. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a flowchart of the preparation method of a liquid bridge welding method for a fiber structure. DETAILED DESCRIPTION OF THE INVENTION

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0032] Example 1

[0033] As Figure 1 shown, a liquid bridge welding method for a fiber structure combines a stocking body of spandex fiber and ultra-fine denier nylon fiber by using the "liquid bridge welding" method, and is specifically implemented according to the following steps:

[0034] Step 1: Use a jacquard stocking machine to prepare a stocking body (the first fiber layer) of 15D spandex fiber, use a micro-nano braiding machine to prepare a sock body of ultra-fine denier nylon fiber 2, and interweave and braid the second fiber layer along the coil direction in the stocking (more fiber layers can also be continuously braided) to obtain a multi-fiber layer with a density of 20 fibers / mm;

[0035] Step 2: Mix dimethyl sulfoxide solvent and m-cresol solvent in a volume ratio of 24:1 at room temperature to prepare a solution; place the mixed solution in a container at room temperature, and stretch and suspend the stocking woven according to Step 2 above the container;

[0036] Step 3: Heat the bottom of the container and gradually heat it to 210°C. During the evaporation process of the mixed solution, the poor solvent with a boiling point of 189°C evaporates first, which plays a protective role for the braided structure. Subsequently, the good solvent with a boiling point of 202°C evaporates, and the dissolved fiber components solidify to form a liquid bridge 3 after the heating is completed, which performs the "liquid bridge welding" function on the connection points between the yarns. The liquid bridge solidifies and connects the first fiber layer and the second fiber layer after the heating is completed to obtain a multi-fiber layer after liquid bridge welding. Wash the multi-fiber layer after liquid bridge welding multiple times to remove the remaining first solvent and second solvent, and a liquid bridge welding method for a fiber structure is completed.

[0037] Example 2

[0038] As Figure 1As shown, a liquid bridge welding method for a fiber structure is to prepare a stocking body made of spandex fiber and combine it with ultra-fine denier nylon fiber by using the "liquid bridge welding" method. The specific implementation steps are as follows:

[0039] S1. Prepare the first fiber layer. In the first fiber layer, stack the first fiber layer and the second fiber layer to obtain a multi-fiber layer;

[0040] The materials of the first fiber layer and the second fiber layer are any one of the following: nylon, polyester, spandex, acrylic, polypropylene, polystyrene, polyvinyl alcohol, polyamide, cellulose nanofiber, and micro-nanofiber;

[0041] S2. Mix the first solvent and the second solvent according to a volume ratio of 20:1 to 30:1 to obtain a liquid bridge solution. The boiling point of the first solvent is lower than that of the second solvent, and the first solvent is miscible with the second solvent;

[0042] Place the liquid bridge solution in a container at room temperature. Straighten the area to be liquid bridge welded of the multi-fiber layer so that the first fiber layer and the second fiber layer are in uniform contact, and suspend it above the container;

[0043] S3. Heat the bottom of the container. During the heating process to 210°C, dimethyl sulfoxide (the first solvent) first evaporates and adheres to the fibers of the first fiber layer and the second fiber layer without dissolving the fibers of the first fiber layer and the second fiber layer. Then, m-cresol (the second solvent) evaporates. After m-cresol is miscible with dimethyl sulfoxide, it dissolves the fibers of the first fiber layer and the second fiber layer and forms a liquid bridge at the junction of the first fiber layer and the second fiber layer. After the heating is completed, the liquid bridge solidifies to obtain a multi-fiber layer after liquid bridge welding;

[0044] S4. Wash the multi-fiber layer after liquid bridge welding multiple times to remove the residual second solvent. A liquid bridge welding method for a fiber structure is completed.

[0045] As mentioned above, only the specific preferred embodiments of the present invention are described, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A liquid bridge welding method for a fiber structure, characterized in that: It includes the following steps: S1. Prepare a first fiber layer and a second fiber layer, and overlap or cross the first fiber layer and the second fiber layer to obtain a multi-fiber layer; The materials of the first fiber layer and the second fiber layer are any one of the following: nylon, polyester, spandex, acrylic, polypropylene, polystyrene, polyvinyl alcohol, polyamide, cellulose nanofibers, and micro-nano fibers; S2. Mix a first solvent and a second solvent according to a volume ratio of 20:1 to 30:1 to obtain a liquid bridge solution. The boiling point of the first solvent is lower than that of the second solvent, and the first solvent is miscible with the second solvent; Place the liquid bridge solution in a container at room temperature, and suspend the multi-fiber layer above the container; S3. Heat the bottom of the container. The first solvent evaporates first and wets and penetrates the surface of the multi-fiber layer to obtain a protective layer. Subsequently, the second solvent evaporates and adheres to the outside of the protective layer, dissolves the protective layer, and then dissolves the first fiber layer and the second fiber layer, so that the joints or adjacent areas of the first fiber layer and the second fiber layer are liquefied to form a liquid bridge. After the heating ends, the liquid bridge solidifies to connect the first fiber layer and the second fiber layer to obtain a multi-fiber layer after liquid bridge welding, and a liquid bridge welding method for a fiber structure is completed.

2. The preparation method of the liquid bridge welding method of a fiber structure according to claim 1, characterized in that: The first solvent is dimethyl sulfoxide, and the second solvent is m-cresol; In step S3, during the heating to 210 °C, dimethyl sulfoxide evaporates first and adheres to the fibers of the first fiber layer and the second fiber layer without dissolving the fibers of the first fiber layer and the second fiber layer. Then m-cresol evaporates. After m-cresol is miscible with dimethyl sulfoxide, it dissolves the fibers of the first fiber layer and the second fiber layer and forms the liquid bridge at the joints of the first fiber layer and the second fiber layer. After the heating ends, the liquid bridge solidifies to obtain the multi-fiber layer after liquid bridge welding.

3. The preparation method of a liquid bridge welding method for a fiber structure according to claim 2, characterized in that: The first fiber layer is a woven structure with pores, the second fiber layer is interwoven in the first fiber layer, and the liquid bridge is formed at the intersection of the first fiber layer and the second fiber layer.

4. The preparation method of a liquid bridge welding method for a fiber structure according to claim 3, characterized in that: The first fiber layer is a cylindrical structure, the second fiber layer is cross-woven in the first fiber layer, and in step S2, the multi-fiber layer is suspended and stretched above the container.

5. The preparation method of a liquid bridge welding method for a fiber structure according to claim 2, characterized in that: In step S1, the first fiber layer and the second fiber layer are in a stacked state, and the first fiber layer and the second fiber layer are evenly contacted by applying an external force on the first fiber layer and the second fiber layer.

6. The preparation method of a liquid bridge welding method for a fiber structure according to claim 5, characterized in that: Straighten the areas to be liquid bridge welded of the stacked first fiber layer and the second fiber layer to make the first fiber layer and the second fiber layer evenly contact.

7. The preparation method of a liquid bridge welding method for a fiber structure according to claim 1, characterized in that: It further includes step S4, washing the multi-fiber layer after liquid bridge welding multiple times to remove the residual second solvent.

8. The preparation method of a liquid bridge welding method for a fiber structure according to any one of claims 1 to 7, characterized in that: In step S1, the multi-fiber layer may include two or more fiber layers.

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