Knitted fabric with flame retardance, preparation process thereof and vamp

Abstract

The invention relates to the technical field of knitted fabrics, in particular to a flame-retardant knitted fabric, a preparation process thereof and a vamp. The knitted fabric with the flame retardance comprises a bottom layer, a surface layer and opening weaves formed on different surfaces of the fabric in an active control mode, the bottom layer comprises first yarn and decomposable yarn, and the first yarn and the decomposable yarn are woven in a matched mode to form the bottom layer; a bottom layer weaving structure formed by weaving the decomposable yarns is decomposed by high temperature or a reagent to form a bottom layer opening structure, and the first yarns are polyester flame-retardant fibers; the surface layer comprises second yarn and decomposable yarn, on the basis of the bottom layer, the second yarn and the decomposable yarn are matched and woven to form the surface layer, and a surface layer woven structure woven by the decomposable yarn is decomposed through high temperature or a reagent to form a surface layer opening structure. The opening texture can be arranged in any area of the vamp, is high in flexibility and is not limited by knitting actions.

Description

Technical Field

[0001] The present invention relates to the technical field of knitted fabrics, and in particular to a knitted fabric with flame retardancy, its preparation process, and a shoe upper. Background Art

[0002] In the traditional fly-knit hole pattern organization, the shedding process woven by the knitting equipment includes complicated needle flipping and loop transfer actions. On the one hand, the knitting time is long. On the other hand, when knitting a similar shedding organization, the loops at the shedding edge are very easy to loop off and become loose, resulting in the scrapping of fabric defects. Even when knitting by the method of using latch needles, the knitting time is long and the production efficiency is low.

[0003] Nowadays, high-calorie or high-temperature environments are very likely to occur in summer and its surroundings, and flame-retardant fabrics are increasingly concerned by the public. Summary of the Invention

[0004] Other features and advantages of the present invention will be described in the following specification, and will be partially obvious from the specification, or understood by implementing the present invention. The objectives and other advantages of the present invention can be realized and obtained through the structures specifically pointed out in the specification and other specification drawings.

[0005] The objective of the present invention is to overcome the above deficiencies and provide a knitted fabric with flame retardancy, its preparation process, and a shoe upper.

[0006] To achieve the above objective, the technical solution of the present invention is:

[0007] In a first aspect, the present invention provides a knitted fabric with flame retardancy, including:

[0008] A bottom layer, which includes a first yarn and a decomposable yarn. The first yarn and the decomposable yarn are woven together to form the bottom layer. The bottom layer weaving structure woven by the decomposable yarn forms a bottom layer shedding organization through high temperature or reagent decomposition. The first yarn is a Yilun flame-retardant fiber;

[0009] A surface layer, which includes a second yarn and a decomposable yarn. On the basis of the bottom layer, the second yarn and the decomposable yarn are woven together to form the surface layer. The surface layer weaving structure woven by the decomposable yarn forms a surface layer shedding organization through high temperature or reagent decomposition. The second yarn is a pre-oxidized fiber;

[0010] The surface layer shedding organization and the bottom layer shedding organization correspond to the same position or different positions on the front and back sides of the knitted fabric.

[0011] In some embodiments, the surface layer weaving structure forms the surface layer shedding organization through high-temperature melting at 60°C - 170°C, and the bottom layer weaving structure forms the bottom layer shedding organization through high-temperature melting at 60°C - 170°C.

[0012] In some embodiments, the surface layer knitting structure is dissolved by an aqueous solution to form a surface layer open structure, and the bottom layer knitting structure is dissolved by an aqueous solution to form a bottom layer open structure.

[0013] In some embodiments, the decomposable yarn is a fusible yarn, and the fusible yarn is a modified thermoplastic polyurethane elastomer, which is formed by modifying a plurality of thermoplastic polyurethane elastomers with different melting points.

[0014] In some embodiments, the decomposable yarn is a water-soluble yarn.

[0015] In some embodiments, the knitted fabric is a single-layer structure or a multi-layer structure.

[0016] In some embodiments, the single-hole structure, multi-hole structure or hole-in-hole structure is formed after the decomposition of a single bottom layer open structure and a surface layer open structure.

[0017] In a second aspect, the present invention provides a shoe upper, which is made of the above-mentioned knitted fabric with flame retardancy, and an open structure is provided at any position of the shoe upper.

[0018] In a third aspect, the present invention provides a preparation process for a knitted fabric, including the following steps:

[0019] Material preparation step: Select knitting yarns according to the structure of the knitted fabric and the way of decomposing to form an open structure;

[0020] Knitting step: Import the corresponding knitting program into the knitting machine, input the corresponding parameters, first perform bottom knitting, then perform surface knitting, and finally knit out a knitted fabric with decomposable yarns;

[0021] High-temperature treatment step: Place the knitted fabric as a whole at a high temperature of 60°C - 170°C for treatment;

[0022] Among them, the knitting step includes bottom layer knitting and surface layer knitting. The bottom layer knitting is formed by using the first yarn and the decomposable yarn for surface knitting, and the surface layer knitting is formed by using the second yarn and the decomposable yarn for surface knitting. The decomposable yarn is knitted to form a corresponding open structure. The first yarn and the second yarn are Yilun flame retardant fibers and pre-oxidized fiber.

[0023] In some embodiments, after the high-temperature treatment step, a dissolution step is also required to dissolve the decomposable yarn in contact with a solvent.

[0024] By adopting the above technical solutions, the beneficial effects of the present invention are:

[0025] 1. For the knitted fabric in the present invention, the three-dimensionality of the open structure is good, and the formed hole patterns are more diverse.

[0026] 2. In the present invention, the holes formed by the open weave can provide the shoe upper with extremely strong air permeability and the functions of moisture discharge and sweat evaporation.

[0027] 3. The preparation process of the knitted fabric in the present invention has a short knitting time and high preparation efficiency. The open weave can be set in any area of the shoe upper, with strong flexibility and not limited by the knitting action.

[0028] 4. Yilun fiber is composed of aromatic main chain units, with a limiting oxygen index greater than 38%, belonging to non-combustible substances. Yilun has the characteristic of not melting, self-extinguishing when removed from the fire, extremely low smoke generation rate, and non-toxic. Yilun does not contain halogens and belongs to green environmental protection fiber.

[0029] 5. Pre-oxidized fiber is a high-performance flame-retardant fiber, which is light in weight, soft, and has good water absorption.

[0030] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure.

[0031] Undoubtedly, such objectives of the present invention and other objectives will become more apparent after the detailed description of the preferred embodiments described in the following with multiple drawings and illustrations.

[0032] To make the above and other objectives, features, and advantages of the present invention more obvious and understandable, one or several preferred embodiments are specifically given below, and in conjunction with the accompanying drawings shown, the detailed description is as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention.

[0034] In the drawings, the same components are denoted by the same reference numerals, and the drawings are schematic and not necessarily drawn to actual scale.

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only one or several embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on such drawings without creative efforts.

[0036] Figure 1 It is a schematic structural diagram of the knitted fabric without open weave in some embodiments of the present invention;

[0037] Figure 2 It is a schematic structural diagram of a flame-retardant knitted fabric in some embodiments of the present invention;

[0038] Figure 3 Weaving diagram of a flame-retardant knitted fabric according to some embodiments of the present invention.

[0039] Main reference numerals: 10, knitted fabric; 20, open weave; 30, fusible yarn. Specific embodiments

[0040] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0041] In addition, in the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0042] In the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. However, indicating a direct connection means that there is no connection relationship constructed through a transition structure between the two connected main bodies, and only a connection structure is used to connect them to form a whole. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0044] According to some embodiments of the present invention, with reference to Figures 1 - 3 , the present invention provides a knitted fabric with flame retardancy, comprising: a bottom layer, which includes a first yarn and a decomposable yarn, the first yarn and the decomposable yarn are woven together to form the bottom layer, and the bottom layer weaving structure woven by the decomposable yarn forms a bottom layer opening structure through decomposition by high temperature or a reagent. The first yarn is a Yilun flame retardant fiber;

[0045] a surface layer, which includes a second yarn and a decomposable yarn. On the basis of the bottom layer, the second yarn and the decomposable yarn are woven together to form the surface layer, and the surface layer weaving structure woven by the decomposable yarn forms a surface layer opening structure through decomposition by high temperature or a reagent. The second yarn is a pre-oxidized fiber;

[0046] The surface layer opening structure and the bottom layer opening structure correspond to the same position or different positions on the front and back sides of the knitted fabric.

[0047] In the present invention, the opening structure of the fly-knit upper refers to a "hole" effect formed after the woven fabric controls the active breakage of the yarn.

[0048] According to some embodiments of the present invention, optionally, the bottom layer weaving structure and the surface layer weaving structure woven by the decomposable yarn form the bottom layer opening structure and the surface layer opening structure through high temperature decomposition. The surface layer weaving structure forms the surface layer opening structure through high temperature melting at 60°C - 170°C, and the bottom layer weaving structure forms the bottom layer opening structure through high temperature melting at 60°C - 170°C. Here, the high temperature refers to the temperature value for melting the decomposable yarn.

[0049] According to some embodiments of the present invention, optionally, the bottom layer weaving structure and the surface layer weaving structure woven by the decomposable yarn form the bottom layer opening structure and the surface layer opening structure through reagent decomposition. The surface layer weaving structure forms the surface layer opening structure through dissolution in an aqueous solution, and the bottom layer weaving structure forms the bottom layer opening structure through dissolution in an aqueous solution.

[0050] According to some embodiments of the present invention, optionally, the decomposable yarn is a fusible yarn 30, and the fusible yarn 30 is a modified thermoplastic polyurethane elastomer, which is formed by modifying a variety of thermoplastic polyurethane elastomers with different melting points.

[0051] According to some embodiments of the present invention, optionally, the decomposable yarn is a water-soluble yarn.

[0052] According to some embodiments of the present invention, optionally, the knitted fabric is a single-layer structure or a multi-layer structure. In the present invention, the knitted fabric is set as a multi-layer fabric. For example, when set as two layers, an opening structure is formed through a process step, and a special effect of "hole in hole" can also be formed at the position where the openings of the first layer and the second layer overlap.

[0053] Optionally, according to some embodiments of the present invention, the single-hole structure, multi-hole structure, or hole-in-hole structure formed after the decomposition of the single bottom opening structure and the surface opening structure.

[0054] According to some embodiments of the present invention, the present invention provides a shoe upper, which is made of the above-mentioned flame-retardant knitted fabric. Opening structures are provided at any position of the shoe upper, and the outline and size of the opening structures are not limited and are set according to requirements. The opening structures on the shoe upper in the present invention are actively controllable. From the start of knitting to the end of knitting and then to the formation of the opening structures; compared with the traditional process, the shoe upper with holes is completed through actions such as needle flipping and needle shifting of the knitting equipment, and the preparation efficiency is high.

[0055] According to some embodiments of the present invention, the present invention provides a preparation process for a knitted fabric, including the following steps:

[0056] Material preparation step: Select knitting yarns according to the structure of the knitted fabric and the way of decomposing to form opening structures;

[0057] Knitting step: Import the corresponding knitting program into the knitting machine, input the corresponding parameters, first perform bottom knitting, then perform surface knitting, and finally knit out a knitted fabric with decomposable yarns;

[0058] High-temperature treatment step: Place the knitted fabric as a whole at a high temperature of 60°C - 170°C for treatment;

[0059] Among them, the knitting step includes bottom layer knitting and surface layer knitting. The bottom layer knitting is made by using the first yarn and the decomposable yarn for surface knitting, and the surface layer knitting is made by using the second yarn and the decomposable yarn for surface knitting. The decomposable yarns are knitted to form corresponding opening structures. The first yarn and the second yarn are Yilun flame-retardant fiber and pre-oxidized fiber respectively.

[0060] Optionally, according to some embodiments of the present invention, after the high-temperature treatment step, a dissolving step is also required to contact and dissolve the decomposable yarns with a solvent.

[0061] Example 1

[0062] Refer to Figure 1 、 Figure 2 , Figure 1 is a schematic structural diagram of the front of a flame-retardant knitted fabric according to some embodiments of the present invention; Figure 2 is a schematic structural diagram of the back of a flame-retardant knitted fabric according to some embodiments of the present invention.

[0063] This embodiment provides a knitted fabric with flame retardancy. The knitted fabric 10 includes: a bottom layer, a surface layer, and an opening structure 20 formed on different surfaces of the fabric by active control. The opening structure formed on the surface layer is called the surface layer opening structure, and the opening structure formed on the bottom layer is called the bottom layer opening structure.

[0064] Among them, the bottom layer includes a first yarn and a decomposable yarn. The first yarn and the decomposable yarn are woven together to form the bottom layer. The bottom layer weaving structure woven by the decomposable yarn forms the bottom layer opening structure through high temperature or reagent decomposition. The first yarn is a Yilun flame retardant fiber; the surface layer includes a second yarn and a decomposable yarn. On the basis of the bottom layer, the second yarn and the decomposable yarn are woven together to form the surface layer. The surface layer weaving structure woven by the decomposable yarn forms the surface layer opening structure through high temperature or reagent decomposition. The second yarn is a pre-oxidized fiber; the surface layer opening structure and the bottom layer opening structure correspond to the same position on the front and back of the knitted fabric.

[0065] The surface layer weaving structure forms the surface layer opening structure through high temperature melting at 60°C - 170°C, and the bottom layer weaving structure forms the bottom layer opening structure through high temperature melting at 60°C - 170°C. The decomposable yarn is a fusible yarn 30, and the fusible yarn 30 is a modified thermoplastic polyurethane elastomer, which is formed by modifying a variety of thermoplastic polyurethane elastomers with different melting points.

[0066] The knitted fabric is a single-layer structure or a multi-layer structure, and the single-hole structure, multi-hole structure or hole-in-hole structure is formed after the decomposition of a single bottom layer opening structure and a surface layer opening structure.

[0067] The shape, size, and position of the decomposable yarn set on the knitted fabric formed in the early stage determine the shape, size, and position of the opening structure formed on the knitted fabric in the later stage.

[0068] Embodiment 2

[0069] Refer to Figure 1 、 Figure 2 , Figure 1 which is a schematic structural diagram of the front of a knitted fabric with flame retardancy according to some embodiments of the present invention; Figure 2 which is a schematic structural diagram of the back of a knitted fabric with flame retardancy according to some embodiments of the present invention.

[0070] This embodiment provides a knitted fabric with flame retardancy. The knitted fabric 10 includes: a bottom layer, a surface layer, and an opening structure 20 formed on different surfaces of the fabric by active control. The opening structure formed on the surface layer is called the surface layer opening structure, and the opening structure formed on the bottom layer is called the bottom layer opening structure.

[0071] The bottom layer includes a first yarn and a decomposable yarn. The first yarn and the decomposable yarn are woven together to form the bottom layer. The bottom layer woven structure formed by the decomposable yarn is decomposed by high temperature or reagent to form a bottom layer opening structure. The first yarn is a Yilun flame retardant fiber;

[0072] The surface layer includes a second yarn and a decomposable yarn. On the basis of the bottom layer, the second yarn and the decomposable yarn are woven together to form the surface layer. The surface layer woven structure formed by the decomposable yarn is decomposed by high temperature or reagent to form a surface layer opening structure. The second yarn is a pre-oxidized fiber; The surface layer opening structure and the bottom layer opening structure correspond to the same position on the front and back of the knitted fabric.

[0073] The surface layer woven structure is dissolved by an aqueous solution to form a surface layer opening structure, and the bottom layer woven structure is dissolved by an aqueous solution to form a bottom layer opening structure. The decomposable yarn is a water-soluble yarn.

[0074] The knitted fabric is a single-layer structure or a multi-layer structure, and the single-hole structure, multi-hole structure or hole-in-hole structure formed after the decomposition of a single bottom layer opening structure and surface layer opening structure.

[0075] Example 3

[0076] This embodiment provides a shoe upper made of the flame-retardant knitted fabric in Example 1 or Example 2, and an opening structure is provided at any position of the shoe upper.

[0077] Example 4

[0078] This embodiment provides a preparation process of a knitted fabric, including the following steps:

[0079] Material preparation step, select the knitting yarn according to the structure of the knitted fabric and the way of decomposing to form the opening structure;

[0080] Knitting step, import the corresponding knitting program into the knitting machine, input the corresponding parameters, first perform bottom knitting, then perform surface knitting, and finally knit out the knitted fabric with decomposable yarn;

[0081] High temperature treatment step, place the knitted fabric as a whole at a high temperature of 60°C - 170°C for treatment; Optional temperature values include but are not limited to: 60°C, 70°C, 80°C, 90°C, 100°C, 110°C, 120°C, 130°C, 140°C, 150°C, 160°C, 170°C;

[0082] Among them, the knitting step includes bottom layer knitting and surface layer knitting. The bottom layer knitting is made by using the first yarn and the decomposable yarn for surface knitting, and the surface layer knitting is made by using the second yarn and the decomposable yarn for surface knitting. The decomposable yarn is knitted to form the corresponding opening structure. The first yarn and the second yarn are Yilun flame retardant fiber and pre-oxidized fiber respectively.

[0083] For the knitting fabric preparation process in Example 4, the knitting yarns selected are: flame-retardant fiber and heat-melt yarn. In the high-temperature treatment step, the high-temperature treatment causes the heat-melt filaments to melt and adhere inside the fabric, achieving a suitable fabric effect.

[0084] Example 5

[0085] This example provides a knitting fabric preparation process, including the following steps:

[0086] Material preparation step: Select the knitting yarns according to the structure of the knitting fabric and the way of decomposing to form an open structure.

[0087] Knitting step: Import the corresponding knitting program into the knitting machine, input the corresponding parameters, first perform bottom knitting, then perform surface knitting, and finally knit out a knitting fabric with decomposable yarns.

[0088] High-temperature treatment step: Place the knitted fabric as a whole at a high temperature of 60°C - 170°C for treatment; Optional temperature values include but are not limited to: 60°C, 70°C, 80°C, 90°C, 100°C, 110°C, 120°C, 130°C, 140°C, 150°C, 160°C, 170°C.

[0089] Dissolution step: Contact the decomposable yarns with a solvent to dissolve them.

[0090] Among them, the knitting step includes bottom-layer knitting and surface-layer knitting. The bottom-layer knitting is formed by using the first yarn and the decomposable yarn for surface knitting, and the surface-layer knitting is formed by using the second yarn and the decomposable yarn for surface knitting. The decomposable yarns are knitted to form the corresponding open structure. The first yarn and the second yarn are Yilun flame-retardant fiber and pre-oxidized fiber respectively.

[0091] For the knitting fabric preparation process in Example 5, the knitting yarns selected are: flame-retardant fiber and soluble yarn. In the high-temperature treatment step, the high-temperature treatment is to make the fabric shrink sufficiently when heated to achieve a suitable fabric effect. The dissolution step after the high-temperature treatment step is to remove the soluble yarn area through a solvent, thereby forming an open structure, that is, the holes on the surface of the knitting fabric.

[0092] The difference between the preparation processes of Example 4 and Example 5 is that in the preparation process of Example 4, the temperature is reasonably controlled to melt the heat-melt yarn to form an open structure; while in the preparation process of Example 5, a dissolution step is also required because the decomposable yarns in the knitting fabric of Example 5 need to be dissolved by a solvent rather than melted by high temperature.

[0093] Such as Figure 3As shown: Yarns A and B are flame-retardant fibers. Both the first yarn and the second yarn in the present invention are flame-retardant fibers. Specifically, yarn A can be Yilun flame-retardant fiber and yarn B can be pre-oxidized fiber. The first yarn and the second yarn described in the present invention are only to distinguish the yarns in the surface layer or the bottom layer; yarn C is fusible yarn 30 (one of the decomposable yarns).

[0094] The first knitting row is that yarn A makes empty needles and alternate knitting with surface knitting.

[0095] The second knitting row is that yarn B makes empty needles and alternate knitting with bottom knitting.

[0096] The third knitting row is that yarn A makes surface knitting and alternate knitting with empty needles.

[0097] The fourth knitting row is that yarn B makes surface knitting and alternate knitting with empty needles.

[0098] The knitting positions of the third and fourth knitting rows are offset by one needle position from the first and second knitting rows.

[0099] The fifth knitting row is that yarn A makes empty needles and alternate knitting with surface knitting.

[0100] The sixth knitting row is that yarn B makes bottom knitting.

[0101] The seventh knitting row is that yarn A makes surface knitting and alternate knitting with empty needles, and bottom knitting is done at some needle positions.

[0102] The eighth knitting row is that yarn B makes bottom knitting, and surface knitting is done at the positions corresponding to the bottom knitting needles in the seventh knitting row.

[0103] The ninth knitting row is that yarn C makes bottom knitting, and empty needle knitting is done at the positions corresponding to the surface knitting needles in the eighth knitting row; (at the bottom opening)

[0104] The tenth knitting row is that yarn A makes surface knitting and alternate knitting with empty needles, and bottom knitting is done at the positions corresponding to the empty needles in the ninth knitting row.

[0105] The eleventh knitting row is that yarn B makes bottom knitting, and surface knitting is done at the positions corresponding to the bottom knitting needles in the tenth knitting row.

[0106] The twelfth knitting row is that yarn A makes surface knitting and alternate knitting with empty needles.

[0107] The thirteenth knitting row is that yarn B makes bottom knitting.

[0108] Among them, for the first to the thirteenth knitting rows, the bottom opening structure is knitted.

[0109] The fourteenth knitting row is that yarn A makes empty needles and alternate knitting with surface knitting.

[0110] The fifteenth knitting row is that yarn B makes empty needles and alternate knitting with bottom knitting.

[0111] The sixteenth knitting row is that yarn A makes surface knitting and alternate knitting with empty needles.

[0112] The 17th knitting row is knitting with B yarn as the face and knitting with empty needles at every other needle;

[0113] The knitting positions of the 16th and 17th knitting rows are offset by 1 needle position from those of the 14th and 15th knitting rows;

[0114] The 18th knitting row is knitting with A yarn as the face;

[0115] The 19th knitting row is knitting with empty needles and bottom knitting at every other needle;

[0116] The 20th knitting row is knitting with A yarn as the face, and bottom knitting is done at some of the needle positions;

[0117] The 21st knitting row is bottom knitting with B yarn and knitting with empty needles at every other needle, and face knitting is done at the needle positions corresponding to the bottom knitting positions of the 20th knitting row;

[0118] The 22nd knitting row is knitting with C yarn as the face, and empty needle knitting is done at the needle positions corresponding to the face knitting positions of the 21st knitting row. (At the opening of the surface layer)

[0119] The 23rd knitting row is knitting with A yarn as the face, and bottom knitting is done at the needle positions corresponding to the empty needle positions of the 22nd knitting row;

[0120] The 24th knitting row is knitting with empty needles and bottom knitting with B yarn at every other needle, and face knitting is done at the needle positions corresponding to the bottom knitting positions of the 23rd knitting row;

[0121] The 25th knitting row is knitting with A yarn as the face;

[0122] The 26th knitting row is bottom knitting with B yarn and knitting with empty needles at every other needle;

[0123] Among them, for the 14th to 26th knitting rows, the opening structure of the surface layer is knitted.

[0124] The above-mentioned Yilun flame-retardant fiber can adopt the polyimide fiber developed by Gaoqi Company, and the pre-oxidized fiber can adopt the pre-oxidized fiber with a fiber fineness of 1.29 dtex produced by Jilin Carbon Valley Carbon Fiber Company.

[0125] It should be understood that the embodiments disclosed in the present invention are not limited to the specific processing steps or materials disclosed herein, but should extend to equivalent alternatives of such features understood by those of ordinary skill in the relevant art. It should also be understood that the terms used herein are only for the purpose of describing specific embodiments and do not mean limitation.

[0126] The "embodiments" mentioned in the specification mean that the specific features or characteristics described in connection with the embodiments are included in at least one embodiment of the present invention. Therefore, the phrases or "embodiments" that appear throughout the specification do not necessarily all refer to the same embodiment.

[0127] In addition, the described features or characteristics may be combined in any other suitable manner into one or more embodiments. In the above description, some specific details, such as thickness, quantity, etc., are provided to give a comprehensive understanding of the embodiments of the present invention. However, those skilled in the relevant art will understand that the present invention can be implemented without one or more of the above specific details or can also be implemented using other methods, components, materials, etc.

Claims

1. A knitted fabric with flame retardancy, characterized in that, it includes: A bottom layer, which includes a first yarn and a decomposable yarn. The first yarn and the decomposable yarn are woven together to form the bottom layer. The bottom layer woven structure formed by the decomposable yarn forms a bottom layer opening structure through high temperature or reagent decomposition. This first yarn is a Yilun flame retardant fiber; A surface layer, which includes a second yarn and a decomposable yarn. On the basis of the bottom layer, the second yarn and the decomposable yarn are woven together to form the surface layer. The surface layer woven structure formed by the decomposable yarn forms a surface layer opening structure through high temperature or reagent decomposition. This second yarn is a pre-oxidized fiber; The surface layer opening structure and the bottom layer opening structure correspond to the same position or different positions on the front and back sides of the knitted fabric.

2. The knitted fabric with flame retardancy according to claim 1, characterized in that, The surface layer woven structure forms a surface layer opening structure through high temperature melting at 60°C - 170°C, and the bottom layer woven structure forms a bottom layer opening structure through high temperature melting at 60°C - 170°C.

3. The knitted fabric with flame retardancy according to claim 1, characterized in that, The surface layer woven structure forms a surface layer opening structure through aqueous solution dissolution, and the bottom layer woven structure forms a bottom layer opening structure through aqueous solution dissolution.

4. The knitted fabric with flame retardancy according to claim 1, characterized in that, The decomposable yarn is a fusible yarn, and the fusible yarn is a modified thermoplastic polyurethane elastomer, which is formed by modifying a variety of thermoplastic polyurethane elastomers with different melting points.

5. The knitted fabric with flame retardancy according to claim 1, characterized in that, The decomposable yarn is a water-soluble yarn.

6. The knitted fabric with flame retardancy according to claim 1, characterized in that, The knitted fabric is a single-layer structure or a multi-layer structure.

7. The knitted fabric with flame retardancy according to claim 1, characterized in that, After decomposition, a single bottom layer opening structure and a surface layer opening structure form a single-hole structure, a multi-hole structure or a hole-in-hole structure.

8. An upper, characterized in that, It is processed from the knitted fabric with flame retardancy according to any one of claims 1 - 6, and an opening structure is provided at any position of the upper.

9. A preparation process of a knitted fabric, characterized in that, it includes the following steps: A material preparation step, selecting knitting yarns according to the structure of the knitted fabric and the way of forming an opening structure by decomposition; A knitting step, importing the corresponding knitting program into the knitting machine, inputting the corresponding parameters, first performing bottom knitting, then performing surface knitting, and finally knitting out a knitted fabric with a decomposable yarn; A high temperature treatment step, placing the knitted fabric as a whole at 60°C - 170°C for high temperature treatment; Among them, the knitting step includes bottom layer knitting and surface layer knitting. The bottom layer knitting is made by using the first yarn and the decomposable yarn for surface knitting, and the surface layer knitting is made by using the second yarn and the decomposable yarn for surface knitting. The decomposable yarn weaves to form the corresponding opening structure. The first yarn and the second yarn are Yilun fiber and pre-oxidized fiber respectively.

10. The preparation process of the knitted fabric according to claim 9, characterized in that, after the high-temperature treatment step, a dissolution step is further required to contact and dissolve the decomposable yarn with a solvent.

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