48 results about "Polyamide fibers" patented technology

This utility model discloses a moisture-wicking and breathable knitted sweater, comprising: a body and sleeves, which are connected by sewing; both the body and sleeves are made of moisture-wicking and breathable knitted fabric; the moisture-wicking and breathable knitted fabric is a loop-stitched structure woven from ground yarn and face yarn; the ground yarn includes moisture-wicking yarn and cooling yarn; the moisture-wicking yarn is U-shaped cross-section polyester filament; the face yarn is cationic dyeable UV-resistant polyamide 6 fiber yarn. Based on this utility model of moisture-wicking and breathable knitted sweater, the moisture-wicking and breathable knitted fabric used in the body and sleeves is a single-layer knitted fabric, which has better breathability compared to composite fabrics. Combined with the loop-stitched structure, the front of the sweater showcases the color and performance characteristics of the cationic dyeable UV-resistant polyamide 6 fiber yarn, while the reverse side exhibits moisture-wicking and cooling effects. When worn, the reverse side is close to the skin, which helps to quickly wick away sweat and adds a cooling sensation to the skin.

This utility model relates to the field of shoe upper technology and discloses a shoe upper with a 3D pattern, including a shoe upper body. The outer walls of the shoe upper body are distributed with a patterned layered structure. The patterned layered structure includes a polyamide fiber woven layer, and stitching lines are distributed around the edges of the polyamide fiber woven layer. A linen layer is attached to one side of the polyamide fiber woven layer, and inner stitching lines are threaded through the perimeter of the linen layer. A fleece inner layer is attached to one side of the linen layer. This utility model is composed of a polyamide fiber woven layer, stitched fiber woven segments, and a surface patterned layer. The fiber woven segments are stitched to the surface of the polyamide fiber woven layer in a distributed manner, and the patterned layer is also composed in a distributed manner. When the shoe upper is subjected to pressure or deformed during wear, it will not be affected by the deformation of the polyamide fiber woven layer surface, thus preventing cracks from appearing after long-term use.

This utility model discloses a knitted fabric made of polyamide fiber material with a small spring molecular structure, specifically relating to the field of knitted fabric technology. It includes multiple knitted structures woven from first and second fiber yarns. The first and second fiber yarns are woven with a double-sided variation structure. Both the first and second fiber yarns are spirally coiled into small spring molecular shapes. Each knitted structure uses a six-way repeat, where the six ways include a first, second, third, fourth, fifth, and sixth way. The first, second, fourth, and fifth ways are all woven from the first fiber yarn, while the third and sixth ways are woven from the second fiber yarn. This utility model uses 50D / 48F high-fill modified polyamide yarn to produce the fabric on a weft-knitted circular knitting machine. The fabric is lightweight, fluffy, soft and smooth to the touch, elastic, and resistant to pilling, meeting the comfort requirements for lightweight outerwear such as T-shirts and polo shirts.

This invention relates to a renewable polyamide 56 fiber, its preparation method, and its application. The raw materials for its production include at least a tackifying renewable polyamide 56 resin. The relative viscosity of the tackifying renewable polyamide 56 resin is 2.4-2.9, and its crystallization temperature is 180-210℃. This invention uses a tackifying renewable polyamide 56 resin obtained by tackifying a recycled polyamide 56 resin produced from recycled polyamide waste fibers and waste fabrics as a raw material. This not only enables the production of fibers with mechanical and dyeing properties comparable to conventional polyamide 56 fibers but also achieves the goal of recycling polyamide waste.

This invention provides a highly durable and functional recycled all-aromatic polyamide fiber, and a method for producing the same. [Solution] A recovered fiber structure containing meta-type all-aromatic polyamide fibers, para-type all-aromatic polyamide fibers, and conductive fibers is dissolved in an amide-based solvent. In this solution, 10 to 25% by mass of meta-type all-aromatic polyamide polymer is dissolved to produce an all-aromatic polyamide dope. This dope is then used for spinning to obtain regenerated all-aromatic polyamide fibers.

A process of separating a polymer-monomer mixture into a solid fraction comprising the polymeric components and a gaseous fraction comprising the gaseous components containing monomers; the process comprising the step of: introducing the polymer-monomer mixture into a separation vessel comprising at least a filter bag, a first outlet for the gaseous fraction and second outlet for the solid fraction, which is on an opposite side of the filter bag with respect to the first outlet; applying a depression inside the filter bag so that the gaseous fraction passes through the filter bag and goes out of the vessel through the first outlet; and discharging the solid fraction through the second outlet; the filter bag comprises a filtering layer 9, which is comprises aramid fibers superficially coated with at least one perfluorocarbon.

The present application relates to the field of textile printing and dyeing technology, and more particularly to an environmentally-friendly dyeing process for nylon fibers, comprising the following steps: S1, pretreatment; S2, ultrasonic-assisted low-temperature dyeing; S3, integrated treatment of phased temperature control and color fixing; S4, post-treatment; S5, drying and setting. The present application adopts the combination of ultrasonic-assisted dispersion, composite levelling agent synergy and phased temperature control, solves the long-standing problems of color mottle and color difference in nylon low-temperature dyeing, increases the one-time success rate of dyeing, almost eliminates the need for rework, and greatly improves the production efficiency. At the same time, the core dyeing temperature is reduced from the traditional high-temperature process of 95-100 DEG C to 65-75 DEG C, with a cooling range of 20-30 DEG C, which reduces the comprehensive energy consumption, greatly reduces the steam and power consumption, and fully meets the development of the textile industry.

The application provides a low-melting-point polyamide fiber and a preparation method thereof. The fiber is prepared by melt blending, spinning and forming of polyamide chip, 1-5wt% of a metal ion compound, 0.5-2wt% of nanoparticles and a stabilizer; the metal ion coordinates with the polyamide amide group to destroy the hydrogen bond network, the nanoparticles regulate the crystallization behavior, and the synergistic effect reduces the melting point of the fiber to 160-180 DEG C, while the strength is greater than 4 cN / dtex. The polyamide fiber has stable performance, low melting point and excellent mechanical properties, the process is simple and controllable, the problems of high melting point of traditional polyamide fiber, mechanical property reduction of existing modification method or complex process are solved, and the polyamide fiber is suitable for low-temperature processing scenes such as textiles, clothes and medical supplies, and has industrial application value.

This invention discloses a polyamide 6 highly conductive fabric for textile-based electronic products and its preparation method, comprising the following steps: (1) mixing a certain amount of precursor with a complexing agent to obtain a mixture; (2) adding a certain amount of solvent to the mixture to obtain an ink mixture; (3) filtering to obtain conductive ink, and storing it in the dark; (4) preparing a modifier; (5) using a rolling mill to uniformly roll the modifier onto the polyamide 6 fabric; (6) drying, sealing and storing to obtain a modified polyamide 6 fabric; (7) uniformly brushing conductive ink onto the surface of the modified polyamide 6 fabric 2-4 times; (8) vacuum sintering treatment. This invention eliminates the reducing agent and other additives in the ink, avoiding the influence of many chemicals in the ink on the conductivity of the nano-silver layer. At the same time, by modifying the surface of the polyamide 6 fiber, the spreading and penetration of the ink on the fiber surface is controlled, thus realizing the preparation of a highly conductive silver layer.

The utility model belongs to the technical field of polyamide fiber processing, and particularly relates to a drying device for polyamide fiber processing, which comprises a drying device shell, a feed port and a discharge port, the feed port is arranged on one side of the drying device shell, the discharge port is arranged on one side of the drying device shell, and the discharge port is arranged at the bottom of the feed port. A drying auxiliary mechanism is arranged in the drying device shell; the drying auxiliary mechanism comprises hot air blowers fixedly installed on the two sides of the drying device shell, a first drying plate is fixedly connected to the inner wall of the drying device shell, and a second drying plate and a third drying plate are arranged at the bottom of the first drying plate and are perpendicularly, downwards and evenly distributed. According to the drying device for polyamide fiber processing, materials can be dried in a flowing mode, heating is carried out in the mode that hot airflow passes through a material layer, contact between heat and the materials is more sufficient and even, and drying efficiency is improved.

The application discloses a preparation method of superfine denier electromagnetic shielding functional chinlon and a product thereof. The chinlon is prepared by mixing 2-7% electromagnetic shielding functional chinlon master batch containing Fe3O4 nanoparticles and 93-98% pure chinlon chips, and then performing drying, melt extrusion, spinning cooling, oiling treatment, drafting setting and winding silk collection. In the preparation process, key parameters such as spinning temperature, filter mesh size, cooling parameter and drafting multiple are optimized, so that the problems of superfine denier fiber spinning breakage, product adhesion and uneven dispersion under high master batch content are solved. The chinlon monofilament fineness obtained by the application is 0.2-0.5 dtex, the breaking strength is greater than or equal to 3.0 cN / dtex, the electromagnetic shielding effectiveness reaches 40 dB in a frequency range of 2000 MHz, the thermal stability is better than that of pure chinlon, and the application is suitable for high-end application scenes such as high-grade clothes, home textiles, electronic protection and filtering materials.

The utility model discloses a kind of knitted fabrics, it is related to textile field, and its technical scheme main point is: including base layer, base layer is by first yarn and second yarn warp knitting, first yarn includes first warp plain organization and second warp plain organization, the needle spacing that second warp plain organization spans in horizontal direction is greater than the needle spacing that first warp plain organization spans in horizontal direction, second yarn includes lack pad organization, second yarn full wear.The utility model forms the obvious mesh structure between first warp plain organization, adjacent lack pad organization is independent in horizontal direction, ensure the air permeability of mesh structure, the needle spacing that second warp plain organization spans in horizontal direction is larger and different second yarn is connected each other, cooperate full wear second yarn in horizontal direction higher density, strengthen the strength of base layer in horizontal direction, lack pad organization ensures the strength of base layer in longitudinal direction, ensure the service life of fabric, polyamide fiber silk has better strength, further ensure the service life of fabric.

The disclosure relates to a method for forming nanofiber-assembled filaments in which an aromatic polyamide nanofiber suspension is first formed into wet nanofiber-assembled filaments via wet-spinning and protonation in a coagulation medium including at least one proton donor along with a non-solvent for the aromatic polyamide. The wet nanofiber-assembled filaments are then drawn to reduce / remove voids in the nanofiber-assembled filaments and improve the mechanical properties of the assembled filaments. The method can be used as a recycling method for used aromatic polyamide fiber / filament materials in which the recycled filaments have high / good mechanical properties relative to virgin filament materials.

The application provides a cool polyamide fiber and a preparation method thereof, and relates to the technical field of fiber materials. The preparation method of the cool polyamide fiber is as follows: 96-100 parts of polyamide 56 chips, 2-3 parts of surface-treated jade powder and 5-6 parts of a phosphine sapphyrin silicon-containing flame retardant are mixed at high speed, extruded and granulated to prepare polyamide master batches; the polyamide master batches are melt-spun to prepare polyamide fibers; the polyamide fibers are sequentially finished with an aqueous formaldehyde solution and proto-catechuic acid, and then washed, dried and cooled to prepare the cool polyamide fiber. The cool polyamide fiber provided in the application has the functions of coolness, bacteriostasis and flame retardation.

This invention discloses a lightweight, high-strength linen-like textile fabric. The fabric has a single-layer interwoven structure, composed of warp and weft yarns. The warp yarns are modified polyester filaments, and the weft yarns are a blend of bamboo charcoal-modified viscose fiber and polyamide fiber. A preparation process for this lightweight, high-strength linen-like textile fabric includes the following steps: raw material preparation and pretreatment, fabric weaving, alkali reduction treatment, linen-like finishing, dyeing and finishing, and post-finishing. The lightweight, high-strength linen-like textile fabric prepared by this invention significantly reduces the fabric weight while maintaining the realism of the linen-like style, and substantially improves breaking strength, Martindale abrasion resistance, and air permeability. It exhibits excellent linen-like style retention after washing, more stable dimensional change after washing, and outstanding overall performance advantages. The innovation and superiority of this invention in raw material matching and preparation process effectively solve the technical problem of existing linen-like fabrics being unable to simultaneously achieve lightweight, high strength, and a linen-like style.

This invention provides an anti-UV, antibacterial, and deodorizing polyamide cooling masterbatch, its preparation method, and its application, belonging to the field of polyamide fiber masterbatch technology. The anti-UV, antibacterial, and deodorizing polyamide cooling masterbatch of this invention is made from the following raw materials in parts by weight: 20-70 parts polyamide resin, 10-35 parts modified titanium dioxide micropowder, 10-35 parts modified cooling functional agent, 1-5 parts modified inorganic / organic compound antibacterial and deodorizing agent, 1-2 parts plasticizer, 0.2-1 part antioxidant, and 0.5-1 part stabilizer. This invention modifies the titanium dioxide micropowder, cooling functional agent, and inorganic / organic compound antibacterial and deodorizing agent, improving the interfacial compatibility and dispersibility between TiO2 micropowder, cooling functional agent, and inorganic / organic compound antibacterial and deodorizing agent and polyamide resin. It integrates the three functions of UV protection, contact cooling, and long-lasting antibacterial properties into a single masterbatch through interfacial bonding technology, solving the problems of easy peeling and poor durability of traditional surface coatings.

The utility model discloses a kind of polyamide fibre high orientation silk dope colouring uniform mixing device, including fixed frame, the inside installation of fixed frame is mixed jar, the inside installation of mixed jar is stirring mechanism, the bottom of mixed jar is equipped with discharge mechanism, the upper surface of mixed jar is installed temperature sensor, the front of fixed frame is equipped with controller, the front of controller is equipped with display screen, the upper surface of mixed jar is equipped with two transparent observation board, the stirring mechanism includes through-hole, the upper surface of mixed jar is installed driving motor, the output of driving motor is installed with rotating shaft, the outer surface of rotating shaft is equipped with helical blade. The device can monitor the temperature inside the mixed jar by temperature sensor, using the cooperation of stirring crank and helical blade, the dope can be fully stirred, the color master batch dispersion is more sufficient, using heating wire can heat the dope.

The application relates to the technical field of polyolefin materials, and particularly discloses a ceramization polyolefin composite material and a preparation method thereof. The ceramization polyolefin composite material comprises the following raw materials in parts by weight: 20-50 parts of a polyolefin elastomer; 10-40 parts of a flame-retardant filler; 10-40 parts of a ceramic filler; 5-20 parts of a plasticizer; 5-20 parts of a reinforcing filler; 1-10 parts of an organic synthetic short fiber; 0.1-5 parts of other additives; the ceramic filler is composed of a porcelain-forming filler and a fluxing agent; the melting point of the porcelain-forming filler is greater than 800 DEG C; the melting point of the fluxing agent is 400-700 DEG C; the usage ratio of the porcelain-forming filler to the fluxing agent is 1:(0.5-2); the organic synthetic short fiber comprises one or a mixture of several of polyester fiber, polyamide fiber, polyacrylonitrile fiber and poly-p-phenyleneterephthalamide fiber; and the length of the organic synthetic short fiber is 0.5-6 mm. The ceramization polyolefin composite material has excellent compactness, integrity, mechanical strength and flame-retardant and heat-insulating performance.

The application relates to the technical field of fabrics, and discloses a moisture-absorbing, sweat-releasing and antibacterial titanium fiber fabric and a preparation method thereof. The 2,4-bis(N,N-dihydroxyethylamino)-6-[N-(3-aminopropyl)methyl acrylamide]-1,3,5-homotriazine is used to graft modify the polyamide fiber fabric, the hydrophilic amide bond, imino and a large number of hydroxyl groups are grafted to the fabric surface, the hydrophilicity and the moisture regain of the fabric are significantly improved, and the moisture-absorbing and sweat-releasing performance of the fabric is improved. Meanwhile, the limiting oxygen index and the flame-retardant performance are improved. A large number of hydroxyl groups on the surface of the polyamide fabric can interact with the hydroxyl groups on the surface of the titanium dioxide precursor generated by hydrolysis of tetrabutyl titanate, the generated nanometer titanium dioxide can be uniformly loaded on the fabric surface, more photocatalytic antibacterial sites are exposed, and the antibacterial performance of the fabric is significantly improved.

This invention discloses a polyamide 12-based shaped cross-section fiber and its preparation method. The fiber uses polyamide 12 as the substrate and has a symmetrical multi-leaf cross-section. The multi-leaf shape consists of at least three leaves evenly arranged radially along the circumference, with each leaf having the same size and continuous moisture-wicking grooves between adjacent leaves. The preparation method includes processes such as high-efficiency vacuum fluidized bed drying, melt extrusion, spinning with a shaped spinneret, side-blowing cooling, double-sided oiling, multi-stage drafting and setting, and high-speed winding. This invention employs a multi-leaf cross-section design, significantly improving the moisture wicking, luster softness, and cohesion of polyamide 12 fibers, while maintaining the inherent advantages of high strength, low moisture absorption, and high weather resistance. It can be widely used in high-end sportswear, intimate apparel, specialty textiles, and industrial applications.

The utility model belongs to wastewater treatment technical field, concretely relates to a kind of polyamide fibre production wastewater treatment device, including box, box is hollow structure, water inlet pipe is fixedly connected on box upside, water inlet pipe extends to box interior, first arc filter cover is fixedly connected in box, first arc filter cover is linked with water inlet pipe, rotatable adjusting group is installed in box, U-shaped support is fixedly connected in rotatable adjusting group both sides, second arc filter cover is rotatably connected in two U-shaped supports.The utility model carries out preliminary filtration to wastewater by second arc filter cover, reduces the blockage of filter screen, when second arc filter cover needs to be replaced, by rotating rotatable adjusting group to drive second arc filter cover to rotate, make one of second arc filter cover and first arc filter cover downside complete docking, to further realize the quick replacement of second arc filter cover, to further reduce the difficulty of replacing second arc filter cover, ensure the continuity of equipment wastewater treatment work.

The present invention provides a V-belt for power transmission that offers excellent tension retention and reduces the need for tension checks and readjustments during use. [Solution] In a power transmission V-belt having a rubber layer with embedded core wires, the core wires are formed from a twisted cord containing aliphatic polyamide fibers, and the difference in the POC change rate shown below is adjusted to 0.3% or more in the power transmission V-belt. POC change rate: This refers to the change rate of POC when tension is applied to a belt by separating the flat pulleys, when the total length of the belt, which is wrapped around a pair of flat pulleys with the inner and outer circumferences reversed, is defined as the POC. However, the initial length of the POC used as the basis for the change rate is the POC when a tension of 15N is applied.

The application relates to an antibacterial and anti-mite DTY chinlon elastic filament and a preparation method thereof, and belongs to the technical field of functional polyamide fiber materials. The DTY chinlon elastic filament comprises synergistically modified chinlon-6, 9,9-bis(4-hydroxyphenyl) fluorene, nano zinc oxide, titanium dioxide, antioxidant 1010 and zinc stearate. The synergistically modified chinlon-6 is constructed with a dynamic borate bond structure, a silane polycondensation grafting structure and a molecular chain end hydrogen bond reconstruction structure in a melt blending process, so as to form a modified polyamide matrix with a dynamic topological entanglement and an interface chemical anchoring double network structure; meanwhile, 9,9-bis(4-hydroxyphenyl) fluorene with a rigid aromatic skeleton structure is introduced to perform molecular scale synergistic regulation. The DTY elastic filament is prepared through a melt spinning, drafting and setting and false twist texturing process. The application realizes long-term stability and washing resistance of antibacterial and anti-mite properties, meanwhile, excellent elastic recovery performance is ensured, and the application has good processing adaptability and application prospect.

The utility model discloses anti -skidding wear -resisting dacron fabric relates to textile technical field, and its technical scheme main points are: the one side of base layer is equipped with a plurality of elastic strips, and the one side of elastic strip is integrally formed with a plurality of supporting blocks, and the both sides of elastic strip are equipped with anti -skid layer one and anti -skid layer two respectively, and anti -skid layer one and a plurality of supporting blocks and elastic strip form a plurality of ventilation space, and the base layer is penetrated and is equipped with a plurality of through -groove, and ventilation space and through -groove intercommunication, and the region of anti -skid layer one and supporting block is opposite and passes through the through -groove along the direction of away from elastic strip, and the elasticity of elastic strip is greater than the elasticity of base layer. The base layer made of flax fiber and polyamide fiber blend can absorb sweat produced by skin in time and remove quickly, can keep the dryness of skin and fabric, and a plurality of elastic strips can form greater resilience after stretching, thereby driving the base layer to be close to the contour of hand, increasing the friction between fabric and skin, thereby improving the anti -skid effect of glove.

This invention relates to a wiping cloth, which is constructed from a fibrous structure using ultrafine polyamide fibers. The fineness of the single yarn of the ultrafine polyamide fibers is 0.7 dtex or less, the content of ultrafine polyamide fibers in the wiping cloth as a whole is 40% by mass or more, and the average number of airborne particles with a diameter of 0.1 μm or more is 10 particles / cm² or less. This invention also relates to a wiping strip, which, when immersed in pure water for 12 hours in a Class 100 environment, has a particle count of 0.2 μm or more in the liquid of 5 particles / ml / cm² or less. Furthermore, this invention relates to a method for manufacturing a wiping strip, characterized by: thermally cutting the fabric for the wiping strip in a cleanroom, and immediately after thermal cutting, using a suction nozzle to remove the fumes generated during thermal cutting. none

The application discloses a cargo hoisting woven belt and a preparation method thereof, and relates to a woven belt, which has the technical scheme as follows: a belt body is provided with a glue part, a plurality of inclined hooks are arranged on the glue part and can be magnetically attracted, the hook comprises a large end part arranged towards the belt body and a small end part arranged away from the belt body and exposed on the surface of the glue part, and the weight of the large end part is greater than that of the small end part. The hook is used to penetrate into a wooden box with light and soft materials such as Korean pine, white pine and Paulownia or the fabric packaging of goods, so that the anti-skid effect is achieved, the hoisting woven belt is prevented from slipping, and the safety during hoisting is improved. The belt body is knitted by using polyamide fibers, the wear resistance of the polyamide fibers is higher than that of all other fibers, the belt body is more wear-resistant, and the service life of the hoisting woven belt is prolonged.

A tire is provided to improve dynamic stability, durability and overall performance, comprising a tread section forming a contact area and a carcass section extending radially inwards from the tread section, wherein the tread section is formed from a tread rubber composition containing styrene-butadiene rubber in a rubber component, a carcass cord forming the carcass section, a hybrid cord containing at least one aromatic polyamide fiber and at least one polyester fiber, and a product of a content A (parts by mass) of styrene-butadiene rubber in 100 parts by mass of the rubber component of the tread rubber composition, a thickness B (mm) of the tread section and a tensile strength C (N) of the hybrid cord greater than 10,000.

Provided are a poly(arylene sulfide) (PAS) molded article having excellent balance of mechanical strength and sliding properties, and high durability; a PAS resin composition capable of providing the molded article; and production methods therefor. More specifically, provided are a PAS resin composition obtained by mixing a PAS resin (A), polyamide fibers (B), and a solid lubricant (C), in which the PAS resin (A) has a melt viscosity (V6) of 50 to 2,000 Pa·s, the polyamide fibers (B) are mixed in an amount of 5 to 35 parts by mass and the solid lubricant (C) is mixed in an amount of 5 to 30 parts by mass, relative to 100 parts by mass of the PAS resin (A), and a molded article has a tensile strength of a weld part of 40 MPa or more in ISO 527-1 and 2; a molded article; and production methods therefor.

The application discloses a kind of hydrophilic wear-resistant fibers and preparation process, and the application relates to the technical field of fiber preparation.The hydrophilic wear-resistant fibers and preparation process include: fiber base material, and the functional modification layer that is compounded on the surface of the fiber base material;The fiber base material is one or more of polyamide fiber, polyester fiber, polypropylene fiber or polyacrylonitrile fiber;The functional modification layer is compounded by hydrophilic component, wear-resistant component and binder, wherein the hydrophilic component accounts for 30%-50% of the total mass of functional modification layer, the wear-resistant component accounts for 20%-40% of the total mass of functional modification layer, and the binder accounts for 10%-30% of the total mass of functional modification layer;The hydrophilic wear-resistant fibers and preparation process, by constructing the functional modification layer compounded by hydrophilic component, wear-resistant component and binder on the surface of fiber base material, hydrophilic component can improve the hydrophilicity of fiber surface, enhance the moisture absorption, moisture conductivity and permeability of fiber, and improve the comfort or work efficiency during use.

Waterproof covers for prosthetics. The waterproof cover may be used with a prosthetic hand or other prosthetics or orthotics. The waterproof cover protects the interior components of the prosthetic. The cover may be flame-resistant. The cover may include two layers. An example cover may have an external layer of fabric knitted from aromatic polyamide (meta-aramid) fiber such as NOMEX® yarn and an interior polyurethane or silicone layer. Another example cover may have a single layer, made of woven aromatic polyamide fiber such as NOMEX or Kevlar® with a silicone coating on one or both sides. For a prosthetic hand, the cover may extend between a thumb and a palm.