A full-toe pantyhose and its knitting method

Abstract

This invention discloses a seamless pantyhose and its knitting method, relating to the field of pantyhose technology. It aims to solve the problem of ensuring the "any cut" invisibility of pantyhose and preventing edges from curling and slipping, while avoiding the decrease in comfort and breathability caused by the use of high-tension or chemical coatings. The key technical points are: it includes a pantyhose body and a stress-cushioning unit disposed at the waistband of the pantyhose body. The stress-cushioning unit includes two covering yarns disposed at the waistband of the pantyhose body. This invention ensures a straight and aesthetically pleasing waistband cut through the stress-cushioning unit, guarantees the structural stability of the cut through the microscopic adhesion points of low-melting-point hot-melt filaments, and provides longitudinal support through supporting ribs. The synergistic effect of these three elements ultimately achieves a seamless pantyhose that can be cut arbitrarily without fraying or curling, while maintaining a crisp and wrinkle-free fit.

Description

Technical Field

[0001] This invention relates to the field of pantyhose technology, and more specifically, to a completely seamless pantyhose and its weaving method. Background Technology

[0002] Pantyhose, also known as tights, are a type of stocking that tightly wraps around the body from the waist to the feet. They can help to shape the legs, provide sun protection, keep out the cold, and help improve varicose veins.

[0003] In the production technology of pantyhose, in order to achieve the ultimate invisibility effect, the "arbitrary cut" technique is usually used, which means directly cutting the fabric without binding and sewing. Currently, existing knitted fabrics are essentially made of loops. When the yarn is bent into a loop, it will accumulate elastic potential energy. In the traditional "arbitrary cut" process, once the edge of the fabric is cut off, the loops at the edge lose the mechanical constraints that originally existed above and below. The internal yarn torque will be released instantly, causing the edge to curl uncontrollably inward or outward.

[0004] To suppress this curling and prevent slippage, existing technologies typically employ methods such as "high-strength physical binding" or "chemical coating fixation," for example, significantly increasing the tension of the elastic fibers at the waist to generate greater radial contraction force, or coating the inside of the cut edge with silicone anti-slip strips. However, this passive approach, while solving the curling problem, sacrifices wearing comfort and breathability.

[0005] Therefore, a new solution is needed to address this problem. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a completely seamless pantyhose and its knitting method, which solves the problems of how to ensure the "any cut" invisibility of pantyhose and prevent the edges from curling and slipping, while avoiding the decrease in comfort and breathability caused by the use of high tension or chemical coatings.

[0007] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a completely seamless pantyhose, comprising a pantyhose body, and further comprising: A stress-absorbing unit is provided at the waistband of the pantyhose body. The stress-absorbing unit includes a first covering yarn and a second covering yarn at the waistband of the pantyhose body. The first covering yarn is made of S-twist yarn, and the second covering yarn is made of Z-twist yarn. The first covering yarn and the second covering yarn are arranged alternately. The first covering yarn and the second covering yarn can generate opposite rotational torques in the relaxed state of the pantyhose body, which cancel each other out at the macroscopic level, so that the resultant torque of the edge of the pantyhose body after any cut is zero, presenting an absolutely straight state. The first covering yarn and the second covering yarn include a core layer and a covering layer wrapped around the outside of the core layer. The core layer is made of a core-sheath structure, and the covering layer is a low-melting-point hot-melt filament. The melting point of the low-melting-point hot-melt filament is lower than that of the main yarn in the core-sheath structure composite yarn. It is used so that after heat setting, the low-melting-point hot-melt filament melts and forms microscopic adhesion points to prevent the coils from coming apart at any cut. Several support ribs are provided at the waistband of the pantyhose body. The support ribs are made of high-density coil columns formed by coiling process, which are used to provide longitudinal support to the pantyhose body and prevent the waistband from folding down under the action of gravity or body movement.

[0008] The invention is further configured such that the supporting ribs are spaced apart in the circumferential direction of the pantyhose body, and the tucking process specifically involves performing at least three tucking actions continuously at a specific needle selection position during the knitting process without unhooking, followed by one unhooking to form a loop, thereby creating a local thickness longitudinally at the waistband of the pantyhose body.

[0009] The present invention is further configured such that: the first covering yarn is an odd-numbered row of coils, and the second covering yarn is an even-numbered row of coils.

[0010] The present invention is further configured to include the following steps: S1. At the waist opening of the pantyhose body, a first yarn feeding nozzle and a second yarn feeding nozzle are provided to feed the first covering yarn made of S-twist yarn and the second covering yarn made of Z-twist yarn, respectively. S2. Control the knitting equipment to knit alternately, so that the first covered yarn forms an odd number of loops and the second covered yarn forms an even number of loops. The opposite rotational torques of the S twist and Z twist cancel each other out at the macro level in the weft direction, forming a stress buffer unit with zero edge torque. S3. Set several specific needle selection positions at intervals in the circumferential direction of the waistband of the pantyhose body; S4. Control the knitting needle to perform at least three consecutive loop-gathering actions at the specific needle selection position without slipping off the loop, and then perform one loop-slipping and loop-forming action. The loop-gathering process increases the local loop density and thickness, forming a support rib that provides longitudinal support. S5. Heat set the completed pantyhose body, controlling the setting temperature to be higher than the melting point of the low melting point hot melt filament in the covering layer and lower than the melting point of the main yarn in the core layer, so that the low melting point hot melt filament melts and forms microscopic adhesion points, preventing the coils at any cut from coming apart.

[0011] In summary, the present invention has the following beneficial effects: The stress-buffered unit ensures a straight and aesthetically pleasing waistband cut. The microscopic adhesion points of the low-melting-point hot-melt filaments ensure the structural stability of the cut. The longitudinal support of the support ribs, combined with the synergistic effect of these three elements, ultimately creates a seamless pantyhose that can be cut arbitrarily without fraying or curling, while maintaining a crisp and wrinkle-free fit. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure of the covering yarn; Figure 3 This is a schematic diagram of the structure of the second layer of covering yarn; Figure 4 This is a cross-sectional view of covering yarn one and covering yarn two.

[0013] In the diagram: 1. Covering yarn one; 2. Covering yarn two; 3. Supporting rib; 4. Core layer; 5. Covering layer. Detailed Implementation

[0014] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0015] In the description of this invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0016] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0017] A type of seamless pantyhose and its knitting method, such as Figures 1-4 As shown, it includes the pantyhose body and also includes: A stress-absorbing unit is located at the waistband of the pantyhose. The stress-absorbing unit includes two covering yarns, namely, a first covering yarn 1 and a second covering yarn 2, which are located at the waistband of the pantyhose. The first covering yarn 1 is made of S-twist yarn, and the second covering yarn 2 is made of Z-twist yarn. The first covering yarn 1 and the second covering yarn 2 are arranged alternately, with the first covering yarn 1 having an odd number of rows of loops and the second covering yarn 2 having an even number of rows of loops. This alternating arrangement of S-twist and Z-twist yarns is the key to achieving a seamless finish. The first covering yarn 1 and the second covering yarn 2 can generate opposite rotational torques in the relaxed state of the pantyhose, which cancel each other out at the macroscopic level. This ensures that the resultant torque at the edge of the pantyhose after any cut is zero, resulting in an absolutely straight state. This design ensures that the resultant torque at the edge of the pantyhose is zero after any cut (i.e., without overlocking or binding). Because the internal stress has reached a static equilibrium, the waist edge will not curl inward or outward due to torsional imbalance, thus presenting an absolutely straight shape; Furthermore, the covering yarn 1 and covering yarn 2 include a core layer 4 and a covering layer 5 wound around the outside of the core layer 4. The core layer 4 is made of a core-sheath structure, and the covering layer 5 is a low-melting-point thermoplastic filament. The melting point of the low-melting-point thermoplastic filament is lower than that of the main yarn in the core-sheath composite yarn. This allows the low-melting-point thermoplastic filament to melt and form microscopic bonding points after heat setting, preventing the coils from unraveling at any cut. After the pantyhose is knitted, a crucial heat setting process is required. At this time, the ambient temperature reaches the melting limit of the low-melting-point thermoplastic filament, causing it to melt. After heat setting, these microscopic bonding points solidify, "welding" all the coil nodes together. Even if the pantyhose is cut in any direction, the coils will not unravel due to the physical constraints at the nodes, achieving true free cutting.

[0018] Several support ribs 3 are located at the waistband of the pantyhose. These support ribs 3 are made of high-density loops formed using a tufting technique to provide longitudinal support to the pantyhose body, preventing the waistband from folding downwards under gravity or body movement. The support ribs 3 are spaced apart along the circumference of the pantyhose body. The tufting technique involves performing at least three consecutive tufting actions at a specific needle selection position during knitting without unwinding, followed by a single unwinding to form a loop. This creates a localized thickness longitudinally at the waistband of the pantyhose body. During knitting, at a pre-set specific needle selection position, the needle tip performs at least three consecutive tufting actions. During this period, the old loops do not unwind, allowing multiple layers of yarn to overlap and accumulate on the same needle. Finally, a single, uniform unwinding is performed to form a loop. The support ribs 3 are spaced apart along the circumference of the pantyhose body (e.g., one rib every certain number of stitches). This process creates localized high-density coil columns on the flat fabric surface of the waistband. Due to the localized thickness at the coiled area, the longitudinal bending modulus of this area is significantly increased. When the user wears pantyhose and performs activities such as walking or squatting, or when the waistband is pulled down by gravity, these support ribs 3 provide the necessary physical support, effectively preventing the waistband area from folding down or wrinkling, and ensuring that the waistband always fits snugly against the waist skin.

[0019] Compilation method: Includes the following steps: S1. At the waist opening of the pantyhose body, a first yarn feeding nozzle and a second yarn feeding nozzle are provided to feed the covering yarn 1 made of S-twist yarn and the covering yarn 2 made of Z-twist yarn, respectively. In some embodiments, before knitting the waistband area of ​​the pantyhose body, the knitting equipment (such as a fully computerized circular knitting machine or a seamless underwear machine) is first configured with a yarn feeding system. A first yarn feeding nozzle and a second yarn feeding nozzle are configured in the equipment. Covering yarn 1, which is made of S-twist yarn, is fed into the first yarn feeding nozzle; covering yarn 2, which is made of Z-twist yarn, is fed into the second yarn feeding nozzle. This ensures that the two yarns with opposite physical properties can be independently controlled, providing a material basis for the subsequent formation of a stress-relief structure. S2. Control the knitting equipment to knit alternately, so that the covered yarn 1 forms an odd number of loops and the covered yarn 2 forms an even number of loops. The opposite rotational torques of the S twist and Z twist cancel each other out at the macro level in the weft direction, forming a stress buffer unit with zero edge torque. In some embodiments, during the rotation of the needle cylinder, the covering yarn 1 is controlled to enter the knitting needle to form odd-numbered rows of the fabric, and the covering yarn 2 is controlled to enter the knitting needle to form even-numbered rows of the fabric. Through this alternating arrangement of odd and even rows, the clockwise internal stress generated by the covering yarn 1 and the counterclockwise internal stress generated by the covering yarn 2 are used to achieve mutual cancellation of rotational torque at the macroscopic level in the weft direction. This alternating stress structure ultimately forms a balanced stress buffer unit in the waist area, so that the resultant torque at the edge of the fabric is zero when it is not constrained by external forces, thus fundamentally eliminating the common curling phenomenon after seamless cutting.

[0020] S3. Set several specific needle selection positions at intervals in the circumferential direction of the waistband of the pantyhose body; In some embodiments, while the waistband area is being circumferentially knitted, the needles on the cylinder are functionally partitioned by a computer control system. Several specific needle selection positions are set in the circumferential direction (lateral circumference) of the waistband of the pantyhose body. These needle selection positions are spaced out (for example, a support point is set every 30-50 needles). These positions will serve as reference points for the subsequent generation of reinforcement structures.

[0021] S4. Control the knitting needle to perform at least three consecutive loop-gathering actions at a specific needle selection position without slipping off the loop, and then perform one loop-slipping action to increase the local loop density and thickness through the loop-gathering process, forming a support rib 3 that provides longitudinal support. In some embodiments, when the knitting needle moves to the aforementioned specific needle selection position, a special loop-forming procedure is performed to change the local weave structure. The needle at this position is controlled to continuously perform at least three loop-forming actions in subsequent knitting cycles without slipping off the loop. At this time, multiple yarns overlap and accumulate within the needle hook without forming new loops. After completing a preset number of loop-forming accumulations, the knitting needle is controlled to perform a unified loop-forming action. This loop-forming process significantly increases the loop density and thickness at this local location, macroscopically presenting as a strip-shaped, high-hardness area, i.e., forming the support rib 3. This support rib 3 provides the necessary longitudinal support for the waistband, keeping the waistband crisp and upright when worn.

[0022] S5. Heat set the completed pantyhose body, controlling the setting temperature to be higher than the melting point of the low melting point hot melt filament in the covering layer 5 and lower than the melting point of the main yarn in the core layer 4, so that the low melting point hot melt filament melts and forms microscopic adhesion points, preventing the coils at any cut from coming apart.

[0023] In some embodiments, the finished pantyhose body needs to be sent to a heat setting machine for final physicochemical stabilization treatment. The setting temperature of the heat setting machine is strictly controlled so that it is higher than the melting point of the low melting point fusible filaments in the covering layer 5, and lower than the melting point of the main yarn in the core layer 4. Within this precise temperature range, the low melting point fusible filaments in the covering layer 5 melt under heat and become viscous and fluid, while the main yarn in the core layer 4 maintains its structural integrity and elasticity. This microscopic adhesion forms a stable mesh locking system, ensuring that when the user makes any cuts at the waistband, the coils at the cut will not come undone or slip due to loss of traction.

[0024] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A completely seamless pantyhose, comprising a pantyhose body, characterized in that, Also includes: A stress-absorbing unit is disposed at the waistband of the pantyhose body. The stress-absorbing unit includes a first covering yarn (1) and a second covering yarn (2) disposed at the waistband of the pantyhose body. The first covering yarn (1) is made of S-twist yarn, and the second covering yarn (2) is made of Z-twist yarn. The first covering yarn (1) and the second covering yarn (2) are arranged alternately. By utilizing the first covering yarn (1) and the second covering yarn (2), opposite rotational torques can be generated in the relaxed state of the pantyhose body, which cancel each other out at the macroscopic level, so that... The pantyhose body has zero resultant torque at the edge after any cut, and is in an absolutely straight state. The first covering yarn (1) and the second covering yarn (2) include a core layer (4) and a covering layer (5) wrapped around the outside of the core layer (4). The core layer (4) is made of a core-sheath structure. The covering layer (5) is a low melting point hot melt filament. The melting point of the low melting point hot melt filament is lower than the melting point of the main yarn in the core-sheath structure composite yarn. After heat setting, the low melting point hot melt filament melts and forms microscopic adhesion points to prevent the coils at any cut from coming apart. Several support ribs (3) are provided at the waist opening of the pantyhose body. The support ribs (3) are made of high-density coil columns formed by coiling process, which are used to provide longitudinal support to the pantyhose body and prevent the waist opening from folding down under the action of gravity or body movement.

2. The seamless pantyhose according to claim 1, characterized in that: The supporting ribs (3) are spaced apart in the circumferential direction of the pantyhose body. The tucking process is specifically to perform at least three tucking actions at a specific needle selection position during the knitting process without unhooking, and then perform one unhooking to form a loop, thereby forming a local thickness longitudinally at the waist of the pantyhose body.

3. The seamless pantyhose according to claim 1, characterized in that: The first layer of the covering yarn (1) is an odd-numbered row of coils, and the second layer of the covering yarn (2) is an even-numbered row of coils.

4. A method for knitting seamless pantyhose, used to knit the seamless pantyhose as described in any one of claims 1-3, characterized in that, Includes the following steps: S1. At the waist opening of the pantyhose body, a first yarn feeding nozzle and a second yarn feeding nozzle are provided to feed the first (1) covering yarn made of S-twist yarn and the second (2) covering yarn made of Z-twist yarn, respectively. S2. Control the knitting equipment to knit alternately, so that the covering yarn one (1) forms an odd number of loops and the covering yarn two (2) forms an even number of loops. The opposite rotational torques of the S twist and Z twist cancel each other out at the macro level in the weft direction, forming a stress buffer unit with zero edge torque. S3. Set several specific needle selection positions at intervals in the circumferential direction of the waistband of the pantyhose body; S4. Control the knitting needle to perform at least three consecutive looping actions at the specific needle selection position without slipping off the loop, and then perform one loop slipping action to increase the local loop density and thickness through the looping process, forming a support rib that provides longitudinal support (3). S5. Heat set the completed pantyhose body, and control the setting temperature to be higher than the melting point of the low melting point hot melt filament in the covering layer (5) and lower than the melting point of the main yarn in the core layer (4), so that the low melting point hot melt filament melts and forms micro-adhesion points to prevent the coils at any cut from coming apart.

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