A mask base cloth and a preparation method and application thereof

Abstract

The application provides a mask base cloth and a preparation method and application thereof, and the preparation method comprises the following steps: a first mixed fiber comprises a combination of fine denier viscose fibers and modal fibers, which is subjected to opening, double-carding and laying, to obtain a skin-felt fiber web layer; a second mixed fiber comprises a combination of vinylon fibers and seaweed fibers, which is subjected to opening, double-carding and laying, to obtain a micro-elastic web layer; the skin-felt fiber web layer and the micro-elastic web layer are stacked and then subjected to water jet entanglement, and the obtained semi-finished product is dried to obtain the mask base cloth. Through the design of fiber types and the compounding of the fiber types with a double carding machine, a specific double-layer structure is obtained, and the water jet process is combined, so that the mask base cloth has a specific microporous structure, cavitation effect and energy loss are avoided, the mask base cloth has excellent skin feeling, high air permeability, excellent liquid absorption and retention capacity, mechanical properties and acoustic properties, can be highly matched with ultrasonic beauty equipment, and can play a lifting and tightening effect.

Description

Technical Field

[0001] This invention belongs to the field of nonwoven fabric technology, specifically relating to a mask base fabric, its preparation method, and its application. Background Technology

[0002] With the continuous improvement of living standards, beauty and skincare have become basic necessities for people. Facial masks are an indispensable product in the beauty and skincare industry, and their market is constantly expanding. Currently, they have become the fourth largest category after skincare, makeup, and hair care, and the market growth rate of facial masks is still increasing. As a skincare product, facial masks can simultaneously address multiple effects such as moisturizing, whitening, oil control, repair, anti-wrinkle, and soothing, which is the main reason for their rapid development. The main structure of a facial mask includes the mask sheet and the essence absorbed on it. Most facial mask sheets are currently made from non-woven fabrics. The fibers used in non-woven fabrics include viscose fiber, Tencel fiber, cupro fiber, polyester fiber, and bio-cellulose, and the manufacturing processes include spunlace, hot rolling, and meltblown processes. Since the main function of the mask sheet is to serve as a carrier of the essence and it is applied to the face during use, the basic performance requirements for mask sheets include a good skin feel, a lightweight texture, and a high liquid capacity.

[0003] In recent years, ultrasound has been widely used in physiotherapy and beauty equipment. Ultrasonic beauty equipment utilizes the strong penetrating power of ultrasound waves, which can penetrate 4-6mm into the subcutaneous layer, to perform physiotherapy on the body and face, achieving effects such as improving skin texture, enhancing metabolism, and regulating the body. Taking the currently popular ultrasound cannon as an example, it uses ultrasound energy to precisely focus and heat the subcutaneous SMAS fascia layer, causing the fascia layer to tighten, quickly firming the skin, and solving problems such as sagging, wrinkles, and other signs of skin aging.

[0004] Ultrasonic beauty devices are typically used in conjunction with facial masks. The mask is applied to the face, and the ultrasonic waves emitted by the device act on the skin through the mask. When the ultrasonic waves act on the liquid carried by the mask, they generate numerous tiny bubbles, a phenomenon known as the "cavitation effect." These bubbles affect the focusing point of the ultrasonic waves, thus weakening their effect on the skin. Furthermore, existing mask fabrics can, to some extent, affect the energy output of the ultrasonic beauty device, leading to energy loss. Therefore, currently used mask fabrics are not sufficiently compatible with ultrasonic beauty devices. Developing mask fabrics that avoid cavitation effects and energy loss, and that better complement ultrasonic beauty devices, is a pressing issue that needs to be addressed in this field. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a mask base fabric, its preparation method, and its application. The preparation method uses a specific type of fiber to form a double-layer structure, combined with a double carding machine and hydroentangling process, to give the resulting mask base fabric a microporous structure that can effectively suppress cavitation effect and energy loss. At the same time, the mask base fabric has excellent skin feel, high breathability, excellent liquid absorption and retention capacity, mechanical properties, and acoustic properties, and can be highly compatible with ultrasonic beauty equipment.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a method for preparing a mask base fabric, the method comprising the following steps:

[0008] A first blended fiber is provided, the first blended fiber comprising a combination of fine denier viscose fiber and modal fiber;

[0009] A second blended fiber is provided, the second blended fiber comprising a combination of vinylon fiber and seaweed fiber;

[0010] The first mixed fiber is opened, carded by a double carding machine and laid into a web to obtain a skin-feel fiber web layer;

[0011] The second mixed fiber is opened, carded by a double carding machine, and laid into a web to obtain a micro-elastic web layer;

[0012] The skin-feel fiber mesh layer and the micro-elastic mesh layer are stacked and then hydroentangled to obtain a semi-finished product;

[0013] The semi-finished product is dried to obtain the mask base fabric.

[0014] In the preparation method provided by this invention, the first mixed fiber, composed of fine denier viscose fiber and modal fiber, has excellent skin feel, and the second mixed fiber, composed of vinylon fiber and seaweed fiber, has excellent micro-elasticity and liquid absorption and retention capabilities. Specific fibers are opened, carded using a double carding machine, and laid into a web to prepare a skin-feel fiber web layer and a micro-elastic web layer, respectively. The skin-feel fiber web layer and the micro-elastic web layer are organically combined through a hydroentangling process, forming a specific microporous structure in the prepared mask base fabric. Simultaneously, the mask base fabric formed by the double-layer weaving method has excellent and delicate skin feel, high breathability, excellent liquid absorption and retention capabilities, mechanical properties, and acoustic properties, enabling it to exert an elastic and firming effect. When soaked in mask essence, it can produce a bidirectional wet elastic effect, tightly adhering to and well wrapping the face, fixing the application position, and preventing the mask from shifting.

[0015] This invention, through research, has discovered that when an ultrasonic beauty device is used in conjunction with a facial mask, the ultrasonic waves acting on the liquid carried by the mask generate a large number of microbubbles. One reason for this is that localized tensile stress within the liquid creates negative pressure. This pressure reduction causes the gas originally dissolved in the liquid to become supersaturated and escape from the liquid as microbubbles, affecting the focusing position of the ultrasonic waves and resulting in a cavitation effect, which is detrimental to the effectiveness of the ultrasonic waves on the skin. The preparation method provided by this invention, through the design of fiber types and their combination with a double carding machine, obtains a specific double-layer structure. Further combined with hydroentangling technology, the prepared mask base fabric has a specific microporous structure, which effectively avoids cavitation effects and energy loss, allowing the ultrasonic waves to be precisely focused and act on the skin. Moreover, the mask base fabric has excellent skin feel, high breathability, excellent liquid absorption and retention capacity, mechanical properties, and acoustic properties, making it highly compatible with ultrasonic beauty equipment and providing excellent lifting and firming effects.

[0016] The following are preferred technical solutions of the present invention, but are not intended to limit the technical solutions provided by the present invention. The purpose and beneficial effects of the present invention can be better achieved and realized through the following preferred technical solutions.

[0017] Preferably, the fineness of the fine denier viscose fiber is ≤1.0 dtex, for example, it can be 0.3 dtex, 0.4 dtex, 0.5 dtex, 0.6 dtex, 0.7 dtex, 0.8 dtex or 0.9 dtex, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range, but 0.4-0.8 dtex is further preferred.

[0018] Preferably, the length of the fine denier viscose fiber is 30-55mm, for example, it can be 32mm, 35mm, 38mm, 40mm, 42mm, 45mm, 48mm, 50mm, 52mm or 54mm, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0019] Preferably, the fineness of the modal fiber is 1.0-3.0 dtex, for example, it can be 1.2 dtex, 1.5 dtex, 1.8 dtex, 2.0 dtex, 2.2 dtex, 2.5 dtex or 2.8 dtex, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0020] Preferably, the length of the modal fiber is 20-50mm, for example, it can be 22mm, 25mm, 28mm, 30mm, 32mm, 35mm, 38mm, 40mm, 42mm, 45mm or 48mm, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0021] Preferably, the mass ratio of fine denier viscose fiber to modal fiber in the first mixed fiber is 1:(1-4), for example, it can be 1:1.2, 1:1.5, 1:1.8, 1:2, 1:2.2, 1:2.5, 1:2.8, 1:3, 1:3.2, 1:3.5 or 1:3.8, etc., and more preferably 1:(1.5-4).

[0022] Preferably, the fineness of the vinylon fiber is 1.0-3.0 dtex, for example, it can be 1.2 dtex, 1.5 dtex, 1.8 dtex, 2.0 dtex, 2.2 dtex, 2.5 dtex or 2.8 dtex, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0023] Preferably, the length of the vinylon fiber is 30-60mm, for example, it can be 32mm, 35mm, 38mm, 40mm, 42mm, 45mm, 48mm, 50mm, 52mm, 55mm or 58mm, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0024] Preferably, the fineness of the seaweed fiber is 1.0-3.5 dtex, for example, it can be 1.2 dtex, 1.5 dtex, 1.8 dtex, 2.0 dtex, 2.2 dtex, 2.5 dtex, 2.8 dtex, 3.0 dtex, 3.2 dtex or 3.4 dtex, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0025] Preferably, the length of the seaweed fiber is 20-50mm, for example, it can be 22mm, 25mm, 28mm, 30mm, 32mm, 35mm, 38mm, 40mm, 42mm, 45mm or 48mm, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0026] Preferably, the mass ratio of vinylon fiber to seaweed fiber in the second mixed fiber is (2-5):1, for example, it can be 2.2:1, 2.5:1, 2.8:1, 3:1, 3.2:1, 3.5:1, 3.8:1, 4:1, 4.2:1, 4.5:1 or 4.8:1, and specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0027] As a preferred embodiment of the present invention, the mass ratio of fine denier viscose fiber to modal fiber in the first mixed fiber is 1:(1.5-4), and the mass ratio of vinylon fiber to seaweed fiber in the second mixed fiber is (2-5):1. Four fiber sizes are designed, and multiple fibers are blended in specific proportions. Combined with a double carding machine and hydroentangling technology, the resulting mask base fabric possesses excellent mechanical properties, acoustic properties, and softness, resulting in a delicate skin feel, good breathability, high liquid absorption, and good liquid retention capacity, making it highly compatible with ultrasonic beauty equipment. If the fiber mass ratio exceeds the preferred range of the present invention, it will affect one or more of the following aspects of the mask fabric: skin feel, breathability, liquid absorption and retention capacity, mechanical properties, acoustic properties, and softness, leading to a decrease in the overall performance of the mask fabric.

[0028] Preferably, the seaweed fiber is obtained by modifying alginate fiber, the modification method comprising: soaking alginate fiber in a polyvinyl alcohol aqueous solution, taking it out and alternating between freezing and thawing to obtain pre-made fiber; soaking the pre-made fiber in a sodium salt solution and then drying it to obtain the seaweed fiber.

[0029] As a preferred embodiment of the present invention, the seaweed fiber is obtained by modifying alginate fiber: first, the alginate fiber is soaked in an aqueous solution of polyvinyl alcohol (PVA), and PVA is adsorbed on the surface of the alginate fiber through the interaction of hydrophilic groups; then, alternating freezing and thawing is performed to form stronger hydrogen bond interactions within the PVA and between the PVA and the alginate fiber; next, it is soaked in a sodium salt solution, and the introduction of sodium salt enhances the intramolecular forces between PVA chains and between the PVA and the alginate fiber, and sodium metal ions and... The PVA fibers coordinate with each other, forming a multi-linked structure that creates a stable cross-linked coating modification layer on the surface of the alginate fiber. This gives the alginate fiber excellent water absorption and retention properties, mechanical properties, and acoustic properties. Furthermore, the outer coating modification layer has better affinity with vinylon fiber (polyvinyl acetal fiber). The resulting microelastic mesh layer and the mask base fabric formed by hydroentanglement with the skin-feel fiber mesh layer have suitable microporous structure, excellent air permeability, mechanical properties, acoustic properties, high water absorption / liquid absorption capacity, and excellent water / liquid retention capacity.

[0030] Preferably, the polyvinyl alcohol content in the aqueous polyvinyl alcohol solution is 20-50% by mass, for example, it can be 22%, 25%, 28%, 30%, 32%, 35%, 38%, 40%, 42%, 45% or 48%, and specific values ​​between the above points. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0031] Preferably, the degree of polymerization of the polyvinyl alcohol is 500-2000, for example, it can be 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800 or 1900, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0032] Preferably, the alginate fiber is soaked in a polyvinyl alcohol aqueous solution for 10-120 minutes, for example, 20 minutes, 30 minutes, 40 minutes, 50 minutes, 60 minutes, 70 minutes, 80 minutes, 90 minutes, 100 minutes or 110 minutes, and specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0033] Preferably, the freezing temperature is ≤-10℃, for example, it can be -80℃, -75℃, -70℃, -65℃, -60℃, -55℃, -50℃, -45℃, -40℃, -35℃, -30℃, -25℃, -20℃, -18℃, -15℃, -12℃, and specific values ​​between the above points. Due to space limitations and for the sake of brevity, this invention will not exhaustively list the specific values ​​included in the range, but it is further preferred to be -80℃ to -10℃.

[0034] Preferably, the freezing time is ≥2h, for example, it can be 3h, 4h, 5h, 6h, 7h, 8h, 9h, 10h, 11h, 12h, 13h, 14h, 15h, 18h, 20h, 22h, 24h, 26h, 28h, 30h, 32h or 36h, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, this invention will not exhaustively list the specific values ​​included in the range.

[0035] Preferably, the thawing temperature is 15-40℃, for example, it can be 18℃, 20℃, 22℃, 25℃, 28℃, 30℃, 32℃, 35℃ or 38℃, and specific values ​​between the above points. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range, and room temperature / normal temperature is further preferred.

[0036] Preferably, the number of cycles of alternating freezing and thawing is ≥3, for example, it can be 4, 5, 6, 7, 8, 9, 10, 12, 15, 18, 20, 22 or 25, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific point values ​​included in the range.

[0037] Preferably, the sodium salt in the sodium salt solution includes any one or a combination of at least two of sodium chloride, sodium lactate, sodium bicarbonate, sodium carbonate, and sodium nitrate.

[0038] Preferably, the sodium salt content in the sodium salt solution is 1-10% by mass, for example, it can be 2%, 3%, 4%, 5%, 6%, 7%, 8% or 9%, and specific values ​​between the above points. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0039] Preferably, the pre-fabricated fiber is soaked in the sodium salt solution for 1-10 hours, for example, 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, 7 hours, 8 hours or 9 hours, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0040] In this invention, the opening process is carried out using conventional opening technology (opening machine) in the art, which is a process of breaking down large fiber blocks and fiber clusters into smaller fiber bundles.

[0041] In this invention, the double carding machine is a double carding machine known in the art, which is the process of carding the opened fiber bundle into a single fiber.

[0042] In this invention, the web laying process involves spreading the combed fibers evenly onto the web forming curtain using a web laying machine, achieving the specified number of layers and weight of the mask base fabric.

[0043] It should be noted that the preparation of both the skin-feel fiber web layer and the microelastic web layer adopts the process route of opening, double carding machine carding and web laying. The specific process parameters for forming the two web layers may be the same or different. Those skilled in the art can make routine adjustments according to the actual situation of the fiber and the instrument.

[0044] Preferably, the weight ratio of the skin-feel fiber mesh layer to the weight ratio of the microelastic mesh layer is 1:(0.8-1.5), for example, it can be 1:0.9, 1:1, 1:1.1, 1:1.2, 1:1.3 or 1:1.4, etc., and more preferably 1:(1-1.2).

[0045] In this invention, the hydroentanglement process involves using a high-pressure water jet to pierce the fiber web from both above and below, causing the fibers to become entangled and bound together, thereby giving the fiber web a certain strength and obtaining the mask base fabric. Simultaneously, different mesh sleeves can be used to create jacquard patterns or meshes of different shapes and densities on the fiber web surface.

[0046] Optionally, in the preparation method of the present invention, a double carding machine is used to prepare a skin-feel fiber mesh layer and a micro-elastic mesh layer respectively. At the same time, a special microporous support mesh curtain is used to design the micropores of the membrane fabric, so that the mask base fabric can effectively eliminate small air bubbles generated by ultrasonic cavitation effect and avoid cavitation effect.

[0047] Preferably, the hydroentanglement pressure is 10-50 bar, for example, 12 bar, 15 bar, 18 bar, 20 bar, 22 bar, 25 bar, 28 bar, 30 bar, 32 bar, 35 bar, 38 bar, 40 bar, 42 bar, 45 bar or 48 bar, and specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range, but 15-30 bar is further preferred.

[0048] It should be noted that during the hydroentanglement process, multiple hydroentanglement heads perform upward and downward punctures, and the hydroentanglement pressure of each hydroentanglement head can be the same or different, each independently ranging from 10 to 50 bar.

[0049] Preferably, the drying process includes sequential suction dehydration and drying.

[0050] Preferably, the drying temperature is 120-160℃, for example, it can be 125℃, 130℃, 135℃, 140℃, 145℃, 150℃ or 155℃, and specific values ​​between the above points. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0051] Preferably, the drying process further includes an inspection step, namely, online detection of the prepared membrane fabric for basis weight, width, foreign matter, and defects.

[0052] Preferably, the drying process further includes an optional step of inspecting and slitting the product into rolls.

[0053] Preferably, the slitting and rolling is carried out using a slitting and rolling machine, and the obtained film cloth is rolled and packaged according to the specified width and length.

[0054] Preferably, the preparation method includes the following steps:

[0055] A first blended fiber is provided, comprising a combination of fine denier viscose fiber and modal fiber in a mass ratio of 1:(1-4); the fine denier viscose fiber has a fineness of 0.4-0.8 dtex and a length of 30-55 mm; the modal fiber has a fineness of 1.0-3.0 dtex and a length of 20-50 mm.

[0056] A second blended fiber is provided, comprising a combination of vinylon fiber and seaweed fiber in a mass ratio of (2-5):1; wherein the vinylon fiber has a fineness of 1.0-3.0 dtex and a length of 30-60 mm; and the seaweed fiber has a fineness of 1.0-3.5 dtex and a length of 20-50 mm.

[0057] The seaweed fiber is obtained by modifying alginate fiber. The modification method includes: soaking the alginate fiber in a polyvinyl alcohol aqueous solution for 10-120 min, taking it out and alternating between freezing and thawing, with each freezing temperature independently ≤-10℃ and each freezing time independently ≥2 h, and repeating the cycle at least 3 times to obtain pre-made fiber; soaking the pre-made fiber in a sodium salt solution for 1-10 h and then drying it to obtain the seaweed fiber.

[0058] The first mixed fiber is opened, carded by a double carding machine and laid into a web to obtain a skin-feel fiber web layer;

[0059] The second mixed fiber is opened, carded by a double carding machine, and laid into a web to obtain a micro-elastic web layer;

[0060] The weight ratio of the skin-feel fiber mesh layer to the microelastic mesh layer is 1:(0.8-1.5);

[0061] The skin-feel fiber mesh layer and the micro-elastic mesh layer are stacked and then hydroentangled. The pressure of the hydroentanglement on both sides is 10-50 bar, and a semi-finished product is obtained.

[0062] The semi-finished product is dehydrated by suction and then dried at 120-160℃ to obtain the mask base fabric.

[0063] In a second aspect, the present invention provides a mask base fabric, which is prepared by the preparation method described in the first aspect.

[0064] Preferably, the basis weight of the mask base fabric is 30-50 g / m². 2 For example, it can be 32g / m 2 35g / m 2 38g / m 2 40g / m 2 42g / m 2 45g / m 2 Or 48g / m2 As well as the specific point values ​​between the above point values, due to space limitations and for the sake of brevity, this invention will not exhaustively list the specific point values ​​included in the range.

[0065] Preferably, the thickness of the mask base fabric is 0.30-0.55mm, for example, it can be 0.32mm, 0.35mm, 0.38mm, 0.40mm, 0.42mm, 0.45mm, 0.48mm, 0.50mm, 0.52mm or 0.54mm, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0066] Preferably, the air permeability of the mask base fabric is ≥2200mm / s, more preferably ≥2450mm / s, and can be 2450-2570mm / s.

[0067] Preferably, the tensile breaking strength of the mask base fabric is 40-52 N / 5 cm, more preferably 47-52 N / 5 cm.

[0068] Preferably, the elongation at break of the mask base fabric is ≥80%, more preferably ≥90%, and can be 90-98%.

[0069] Preferably, the water retention rate of the mask base fabric is ≥1100%, more preferably ≥1300%, and can be 1300-1325%.

[0070] Thirdly, the present invention provides a mask fabric, the mask fabric comprising the mask base fabric as described in the second aspect.

[0071] Preferably, the mask fabric includes a mask base fabric and an ink printing layer disposed on one side of the mask base fabric.

[0072] As a preferred technical solution of the present invention, one side of the mask cloth can be formed with an ink printing layer by screen printing technology. Within the range of the ultrasonic beauty equipment, the drawback of conventional printed mask cloth being too stiff is solved, making the mask cloth with the printing layer fit the face better during use.

[0073] Preferably, the ink printing layer is a thermochromic ink layer.

[0074] As a preferred embodiment of the present invention, the mask fabric is provided with a temperature-sensitive color-changing ink layer, which changes color upon temperature change to provide an indication function. Because the energy of ultrasonic beauty devices is precisely focused, repeated application of ultrasound to the same location in a short period can raise the temperature and easily cause skin damage. Therefore, printing a temperature-sensitive color-changing ink layer on the mask fabric allows it to change color upon heating, indicating to the user that ultrasound has been applied to the corresponding area, thus avoiding skin damage caused by repeated ultrasound applications.

[0075] Compared with the prior art, the present invention has the following beneficial effects:

[0076] (1) In the preparation method provided by the present invention, a specific double-layer structure is obtained by designing the fiber type and combining it with a double carding machine. This is further combined with the hydroentangling process to make the prepared mask base fabric have a specific microporous structure, which can effectively avoid cavitation effect and energy loss, so that the ultrasound can be accurately focused and act on the skin. Moreover, the mask base fabric has excellent skin feel, high breathability, excellent liquid absorption and retention capacity, mechanical properties and acoustic properties, which can be highly compatible with ultrasound beauty equipment and exert excellent lifting and firming effects.

[0077] (2) By optimizing the type, size and ratio of fibers and combining them with the process, the present invention enables the formation of a specific microporous structure in the mask base fabric, with an air permeability ≥2450mm / s, a tensile breaking strength of 47-52N / 5cm, a breaking elongation ≥90%, and a water retention rate ≥1300%. It has excellent mechanical properties, acoustic properties and softness, a delicate skin feel, good air permeability, large liquid absorption and good liquid retention capacity, and is a mask fabric with excellent comprehensive performance. Detailed Implementation

[0078] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0079] The terms “comprising,” “including,” “having,” “containing,” or any other variations thereof, as used herein, are intended to cover non-exclusive inclusion. For example, a composition, step, method, article, or apparatus that includes the listed elements is not limited to those elements and may also include other elements not expressly listed or elements inherent to such composition, step, method, article, or apparatus.

[0080] In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0081] "Optionally", "maybe", "any one" means that the matter or event described thereafter may or may not occur, and the description includes both the possibility that the event may occur and the possibility that the event may not occur.

[0082] In the following specific embodiments of the present invention, the fibers used are all commercially available products, for example, purchased from Sanjiang Enterprise, and the fineness and length of the fibers are as follows:

[0083] (1) Fine denier viscose fiber: 0.6 dtex × 40 mm;

[0084] (2) Modal fiber: 1.0 dtex × 38 mm;

[0085] (3) Vinylon fiber: 1.67 dtex × 38 mm;

[0086] (4) Alginate fiber: 1.8dtex×38mm.

[0087] Preparation Example 1

[0088] Seaweed fiber F1 is obtained by modifying alginate fiber, and the preparation method is as follows:

[0089] (1) Polyvinyl alcohol (PVA, commercially available, degree of polymerization 1200) powder was added to hot water and heated and stirred at 90°C to dissolve it completely, resulting in a PVA aqueous solution with a PVA concentration of 30%; Alginate fiber was soaked in the PVA aqueous solution for 1 hour, and then subjected to alternating freezing and thawing. Each freezing temperature was -20°C and the time was 5 hours; each thawing was carried out at room temperature and thawed to room temperature; the cycle was repeated 8 times to obtain pre-made fiber;

[0090] (2) The pre-made fiber was soaked in sodium chloride aqueous solution (NaCl concentration of 8%) for 2 hours, and then dried at 60°C to obtain the seaweed fiber F1.

[0091] Preparation Example 2

[0092] Seaweed fiber F2 is obtained by modifying seaweed fiber with alginate. The preparation method is as follows:

[0093] (1) PVA powder (degree of polymerization 1200) was added to hot water and heated and stirred at 90°C to dissolve it completely, so as to obtain a PVA aqueous solution with a PVA concentration of 25%; alginate fiber was soaked in the PVA aqueous solution for 2 hours, and then it was taken out and alternately frozen and thawed. The freezing temperature was -15°C and the time was 3 hours each time; each thawing was carried out at room temperature and thawed to room temperature; the cycle was repeated 10 times to obtain the pre-made fiber;

[0094] (2) The pre-made fiber was soaked in sodium lactate aqueous solution (sodium lactate concentration of 8%) for 5 hours, and then dried at 60°C to obtain the seaweed fiber F2.

[0095] Preparation Example 3

[0096] Seaweed fiber F3 is obtained by modifying seaweed fiber with alginate. The preparation method is as follows:

[0097] (1) PVA powder (degree of polymerization 1200) was added to hot water and heated and stirred at 90°C to dissolve it completely, so as to obtain a PVA aqueous solution with a PVA concentration of 40%; alginate fiber was soaked in the PVA aqueous solution for 1 hour, and then it was taken out and alternately frozen and thawed. The freezing temperature was -15°C and the time was 6 hours each time; each thawing was carried out at room temperature and thawed to room temperature; the cycle was repeated 4 times to obtain the pre-made fiber;

[0098] (2) The pre-made fiber was soaked in sodium chloride aqueous solution (NaCl concentration of 8%) for 3 hours, and then dried at 60°C to obtain the seaweed fiber F3.

[0099] Preparation Example 4

[0100] Seaweed fiber F4 is obtained by modifying seaweed fiber with alginate. The preparation method is as follows:

[0101] (1) PVA powder (degree of polymerization of 1200) was added to hot water and heated and stirred at 90°C to dissolve it completely, so as to obtain a PVA aqueous solution with a PVA concentration of 30%; alginate fiber was soaked in the PVA aqueous solution for 1 hour, and then dried at 60°C to obtain pre-made fiber;

[0102] (2) The pre-made fiber was soaked in sodium chloride aqueous solution (NaCl concentration of 8%) for 2 hours, and then dried at 60°C to obtain the seaweed fiber F4.

[0103] Preparation Example 5

[0104] Seaweed fiber F5 is obtained by modifying alginate fiber, and the preparation method is as follows:

[0105] PVA powder (degree of polymerization 1200) was added to hot water and heated and stirred at 90°C to dissolve it completely, resulting in a PVA aqueous solution with a PVA concentration of 30%. Alginate fiber was soaked in the PVA aqueous solution for 1 hour, and then subjected to alternating freezing and thawing. Each freezing was carried out at -20°C for 5 hours. Each thawing was carried out at room temperature. The cycle was repeated 8 times to obtain the alginate fiber F5.

[0106] Example 1

[0107] A mask base fabric and its preparation method, the preparation method comprising the following steps:

[0108] Preparation of skin-feel fiber web: Fine denier viscose fiber and modal fiber are mixed at a mass ratio of 1:3 to obtain a first mixed fiber; the first mixed fiber is opened, carded by a double carding machine and laid into a web to obtain a skin-feel fiber web;

[0109] Preparation of the microelastic web layer: Vinylon fiber and seaweed fiber F1 are mixed at a mass ratio of 4:1 to obtain a second mixed fiber; the second mixed fiber is opened, carded by a double carding machine and laid into a web to obtain a microelastic web layer;

[0110] Hydroentanglement: The skin-feel fiber mesh layer and the micro-elastic mesh layer are stacked, with a basis weight ratio of 1:1.2 between the skin-feel fiber mesh layer and the micro-elastic mesh layer; the stacked double-layer structure is hydroentangled using a hydroentanglement machine, with a hydroentanglement pressure of 25 bar on the front side and 20 bar on the back side, to obtain a semi-finished product;

[0111] Drying: The semi-finished product obtained by hydroentanglement is first dehydrated by suction, and then dried in an oven at 140°C. It is then cut into rolls and packaged to obtain the mask base fabric.

[0112] The basis weight of the mask base fabric provided in Example 1 was tested according to the method in standard FZ / T 60003-1991 and was 39.9 g / m². 2 The thickness of the mask base fabric provided in Example 1 was tested using a fabric thickness gauge according to the method in standard FZ / T 01006-2008. The average value of the test was 0.48 mm.

[0113] Example 2-12

[0114] A mask base fabric and its preparation method are disclosed, differing from Example 1 only in the composition of the first and second mixed fibers, as shown in Table 1. In Table 1, seaweed fibers F1-F5 are from Preparation Examples 1-5, and F6 is unmodified alginate fiber. "Fine denier viscose:modal" indicates the mass ratio of fine denier viscose fiber to modal fiber in the first mixed fiber; "vinylon:seaweed" indicates the mass ratio of vinylon fiber to seaweed fiber in the second mixed fiber. The components not shown in Table 1, the preparation processes and parameters of each mask base fabric, and the methods for testing basis weight and thickness are all the same as in Example 1.

[0115] Table 1

[0116]

[0117] Comparative Example 1

[0118] A mask base fabric and its preparation method are disclosed, differing from Example 1 only in that the fine denier viscose fibers are replaced with an equal mass of modal fibers, meaning the entire skin-feel fiber web layer is made of modal fibers; other components and preparation processes are the same as in Example 1, yielding a basis weight of 40.1 g / m². 2 The mask base fabric has a thickness of 0.51mm.

[0119] Comparative Example 2

[0120] A mask base fabric and its preparation method are disclosed, differing from Example 1 only in that seaweed fibers are replaced with an equal mass of vinylon fibers, i.e., the entire microelastic layer is made of vinylon fibers; other components and preparation processes are the same as in Example 1, yielding a basis weight of 40.0 g / m². 2 The mask base fabric has a thickness of 0.49mm.

[0121] Comparative Example 3

[0122] It uses commercially available Tencel mask fabric with a weight of 39.8g / m². 2 The thickness is 0.48mm.

[0123] The performance of the aforementioned mask base fabric was tested using the following methods:

[0124] (1) Air permeability: The air permeability rate was tested using a fully automatic air permeability tester according to the method in standard GB / T 5453-1997. The test pressure was 100Pa. Eight data points were tested for each sample, and the average value was taken.

[0125] (2) Tensile properties: The tensile strength and elongation at break (MD) were tested using a universal testing machine according to the method in standard GB / T 24218.3-2010.

[0126] (3) Liquid absorption and retention performance: The liquid absorption capacity of the mask base fabric was tested according to the method in standard GB / T 24218.6-2010. The test mask fabric was soaked in water for 30 minutes and then left in the air for about 2 minutes until the water absorbed on the surface of the mask fabric did not drip off. The weight was then measured. The rate of change in mass before and after water absorption is the water retention rate. Five data points were measured for each sample and the average value was taken.

[0127] The test results are shown in Table 2:

[0128] Table 2

[0129]

[0130]

[0131] According to the test data in Table 2, compared with the commercially available Tencel mask fabric of Comparative Example 3, this invention uses a blend of fine denier viscose fiber and modal fiber to prepare a skin-feeling fiber mesh layer, and a blend of vinylon fiber and seaweed fiber to prepare a micro-elastic mesh layer. The two-layer structure is combined through a hydroentangling process, resulting in a mask base fabric with a specific microporous structure. This avoids cavitation effects and energy loss, resulting in an excellent, delicate skin feel, higher breathability, superior liquid absorption and retention capacity, mechanical properties, and acoustic properties. Through the design of seaweed fiber and the optimization of fiber ratio, a specific microporous structure is formed in the mask base fabrics prepared in Examples 1-5. Its air permeability is 2450-2570 mm / s, tensile breaking strength is 47-52 N / 5 cm, elongation at break is 90-98%, and water retention rate is 1300-1325%. It possesses excellent mechanical properties, acoustic properties, and softness, with a delicate skin feel, good breathability, high liquid absorption, and good liquid retention capacity.

[0132] Furthermore, a comparison of Examples 1 and 6-8 reveals that the seaweed fiber of this invention is preferably obtained through modification of alginate fiber. Through PVA adsorption, multiple freeze-thaw cycles, and sodium salt reinforcement, a stable cross-linked coating modification layer is formed on the surface of the alginate fiber. The resulting microelastic mesh layer and the mask base fabric formed by the hydroentanglement of the skin-feel fiber mesh layer possess suitable microporous structure, excellent breathability, mechanical properties, acoustic properties, and liquid absorption / retention capacity. If unmodified alginate fiber is used (Example 8), multiple freeze-thaw cycles are not performed during modification (Example 6), or sodium salt reinforcement is not used (Example 7), the formation of the porous structure in the mask base fabric will be affected, leading to a decrease in breathability and liquid absorption / retention capacity.

[0133] A comparison of Examples 1 and 9-12 shows that the optimized design of the first mixed fiber, in which the mass ratio of fine denier viscose fiber to modal fiber is 1:(1.5-4), and the mass ratio of vinylon fiber to seaweed fiber in the second mixed fiber is (2-5):1, enables the mask base fabric to achieve excellent comprehensive effects in terms of mechanical properties, acoustic properties, softness, breathability, skin feel, and liquid absorption and retention capacity. In Examples 9-12, the mass ratio of fibers exceeds the preferred range, resulting in varying degrees of decline in the skin feel, breathability, liquid absorption and retention capacity, mechanical properties, and acoustic properties of the mask fabric.

[0134] The membrane fabrics in Comparative Examples 1-2 did not use the fiber types specified in this invention, resulting in poor skin feel and softness, decreased mechanical and acoustic properties, insufficient air permeability and liquid absorption and retention capacity, and inability to effectively avoid cavitation effect and energy loss.

[0135] The applicant declares that this invention illustrates the mask base fabric, its preparation method, and its application through the above embodiments. However, this invention is not limited to the above embodiments, meaning that this invention does not necessarily rely on the above embodiments for implementation. Those skilled in the art should understand that any improvements to this invention, equivalent substitutions of the raw materials in the product, addition of auxiliary components, and selection of specific methods, all fall within the protection and disclosure scope of this invention.

Claims

1. A method for preparing a mask base fabric, characterized in that, The preparation method includes the following steps: A first blended fiber is provided, the first blended fiber comprising a combination of fine denier viscose fiber and modal fiber; A second blended fiber is provided, the second blended fiber comprising a combination of vinylon fiber and seaweed fiber; The first mixed fiber is opened, carded by a double carding machine and laid into a web to obtain a skin-feel fiber web layer; The second mixed fiber is opened, carded by a double carding machine, and laid into a web to obtain a micro-elastic web layer; The skin-feel fiber mesh layer and the micro-elastic mesh layer are stacked and then hydroentangled to obtain a semi-finished product; The semi-finished product is dried to obtain the mask base fabric; The mass ratio of fine denier viscose fiber to modal fiber in the first mixed fiber is 1:(1.5-4); The mass ratio of vinylon fiber to seaweed fiber in the second mixed fiber is (2-5):1; The fine denier viscose fiber has a fineness of 0.4-0.8 dtex; The modal fibers have a fineness of 1.0-3.0 dtex; The fineness of the vinylon fiber is 1.0-3.0 dtex; The fineness of the seaweed fibers is 1.0-3.5 dtex; The seaweed fiber is obtained by modifying seaweed fiber with alginate. The modification method includes: soaking seaweed fiber in a polyvinyl alcohol aqueous solution, taking it out and alternating between freezing and thawing to obtain pre-made fiber. The pre-made fibers are soaked in a sodium salt solution and then dried to obtain the seaweed fibers.

2. The preparation method according to claim 1, characterized in that, The length of the fine denier viscose fiber is 30-55 mm.

3. The preparation method according to claim 1, characterized in that, The modal fibers are 20-50 mm in length.

4. The preparation method according to claim 1, characterized in that, The length of the vinylon fiber is 30-60 mm.

5. The preparation method according to claim 1, characterized in that, The seaweed fibers are 20-50 mm in length.

6. The preparation method according to claim 1, characterized in that, The polyvinyl alcohol aqueous solution contains 20-50% polyvinyl alcohol by mass.

7. The preparation method according to claim 1, characterized in that, The alginate fiber is soaked in a polyvinyl alcohol aqueous solution for 10-120 minutes.

8. The preparation method according to claim 1, characterized in that, The freezing temperature is ≤-10℃.

9. The preparation method according to claim 1, characterized in that, The freezing time is ≥2 h.

10. The preparation method according to claim 1, characterized in that, The thawing temperature is 15-40℃.

11. The preparation method according to claim 1, characterized in that, The number of alternating freezing and thawing cycles is ≥3.

12. The preparation method according to claim 1, characterized in that, The sodium salt in the sodium salt solution includes any one or a combination of at least two of sodium chloride, sodium lactate, sodium bicarbonate, sodium carbonate, and sodium nitrate.

13. The preparation method according to claim 1, characterized in that, The sodium salt solution contains 1-10% sodium salt by mass.

14. The preparation method according to claim 1, characterized in that, The pre-fabricated fibers are soaked in sodium salt solution for 1-10 hours.

15. The preparation method according to claim 1, characterized in that, The weight ratio of the skin-feel fiber mesh layer to the weight ratio of the microelastic mesh layer is 1:(0.8-1.5).

16. The preparation method according to claim 15, characterized in that, The weight ratio of the skin-feel fiber mesh layer to the weight ratio of the microelastic mesh layer is 1:(1-1.2).

17. The preparation method according to claim 1, characterized in that, The hydroentanglement pressure is 10-50 bar.

18. The preparation method according to claim 1, characterized in that, The hydroentanglement pressure is 15-30 bar.

19. The preparation method according to claim 1, characterized in that, The drying process includes sequential suction dehydration and drying.

20. The preparation method according to claim 19, characterized in that, The drying temperature is 120-160℃.

21. The preparation method according to claim 1, characterized in that, The preparation method includes the following steps: A first blended fiber is provided, comprising a combination of fine denier viscose fiber and modal fiber in a mass ratio of 1:(1.5-4); the fine denier viscose fiber has a fineness of 0.4-0.8 dtex and a length of 30-55 mm; the modal fiber has a fineness of 1.0-3.0 dtex and a length of 20-50 mm. A second blended fiber is provided, comprising a combination of vinylon fiber and seaweed fiber in a mass ratio of (2-5):1; the vinylon fiber has a fineness of 1.0-3.0 dtex and a length of 30-60 mm; the seaweed fiber has a fineness of 1.0-3.5 dtex and a length of 20-50 mm. The seaweed fiber is obtained by modifying alginate fiber. The modification method includes: soaking the alginate fiber in a polyvinyl alcohol aqueous solution for 10-120 min, taking it out and alternating between freezing and thawing, with each freezing temperature independently ≤-10℃ and each freezing time independently ≥2 h, and repeating the cycle at least 3 times to obtain pre-made fiber; soaking the pre-made fiber in a sodium salt solution for 1-10 h and then drying it to obtain the seaweed fiber. The first mixed fiber is opened, carded by a double carding machine and laid into a web to obtain a skin-feel fiber web layer; The second mixed fiber is opened, carded by a double carding machine, and laid into a web to obtain a micro-elastic web layer; The weight ratio of the skin-feel fiber mesh layer to the microelastic mesh layer is 1:(0.8-1.5); The skin-feel fiber mesh layer and the micro-elastic mesh layer are stacked and then hydroentangled. The pressure of the hydroentanglement on both sides is 10-50 bar, and a semi-finished product is obtained. The semi-finished product is dehydrated by suction and then dried at 120-160℃ to obtain the mask base fabric.

22. A mask base fabric, characterized in that, The mask base fabric is prepared by the preparation method according to any one of claims 1-21.

23. The mask base fabric according to claim 22, characterized in that, The base fabric of the mask has a basis weight of 30-50 g / m². 2 .

24. The mask base fabric according to claim 22, characterized in that, The thickness of the mask base fabric is 0.30-0.55mm.

25. The mask base fabric according to claim 22, characterized in that, The air permeability of the mask base fabric is ≥2200 mm / s.

26. The mask base fabric according to claim 22, characterized in that, The tensile breaking strength of the mask base fabric is 40-52 N / 5 cm.

27. The mask base fabric according to claim 22, characterized in that, The elongation at break of the mask base fabric is ≥80%.

28. The mask base fabric according to claim 22, characterized in that, The water retention rate of the mask base fabric is ≥1100%.

29. A facial mask sheet, characterized in that, The mask fabric includes the mask base fabric as described in any one of claims 22-28.

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