Environment-friendly degradable disposable clean socks

Abstract

The invention discloses an environment-friendly degradable disposable clean sock which is characterized in that for particles with the particle size larger than or equal to 0.5 micrometer, the dust generation amount of the disposable clean sock in air does not exceed 300 counts per sock; the disposable clean socks are formed by weaving polylactic acid filaments. The disposable clean socks provided by the invention are made of the polylactic acid filaments, so that the production investment of new materials can be reduced, the consumption of petroleum energy is reduced, and energy conservation and environmental protection are realized. Compared with a traditional polyester and PLA biodegradable agent, the influence on the environment after treatment is smaller, accumulation of plastic garbage and damage to an ecological system can be reduced, circulation in the nature can be achieved, and the PLA biodegradable material is an ideal and preferable green high polymer material. And in the aspect of material selection, the production process of the filaments is continuous, the long filaments are directly produced from a spinning machine, and compared with short fibers, the filaments are smooth in surface, less in hairiness and less in dust generation amount because the fibers are continuous, less in breakage or falling and high in breaking strength.

Description

Technical Field

[0001] The invention belongs to the technical field of socks, and in particular relates to environmentally friendly and degradable disposable clean socks. Background Art

[0002] In August 2022, the new GMP (Good Manufacturing Practice) regulations were introduced to further regulate the production environment and product quality to ensure higher hygiene standards and product safety. Clean socks are a new concept and new application product born with the new GMP regulations. The purpose is to prevent the contamination of the environment and products by blocking the flow of contaminants from the feet of people entering the dust-free clean area.

[0003] Clean socks are a product with a new concept and new application field. Ordinary civilian sock manufacturers are unaware of this regulation and this application field, and do not have the relevant conditions such as production technology, qualifications, environment and facilities for clean socks. They are unable to produce such products and have no corresponding sales channels.

[0004] The socks currently sold on the market are basically woven with polyester staple fibers, cotton staple fibers or spandex staple fibers, which have lower costs and better comfort levels on the market. However, such socks made of staple fibers often have a lot of hair on the surface, generate a lot of dust, and have low cleanliness. They cannot meet the use requirements of clean and dust-free areas such as GMP clean room workshops, clean rooms, and laboratories. Summary of the invention

[0005] The purpose of the present invention is to solve the above-mentioned technical problems and provide an environmentally friendly and degradable disposable clean socks.

[0006] In order to solve the above problems, the present invention is implemented according to the following technical solutions:

[0007] The invention provides an environmentally friendly and degradable disposable clean socks. For particles with a particle diameter of ≥0.5 micron, the dust amount of the disposable clean socks in the air does not exceed 300 counts / piece; the disposable clean socks are woven from polylactic acid filaments.

[0008] Preferably, the fabric structure of the disposable clean socks is a plain weave structure.

[0009] Preferably, the fabric structure of the disposable clean socks is a single-layer plain weave structure with a plain needle of 164G-380G.

[0010] Preferably, the disposable clean socks are woven from polylactic acid filaments of 75D / 36F specifications.

[0011] Preferably, the disposable clean socks are prepared by the following method:

[0012] Weaving socks: using polylactic acid filaments to weave in a plain weave structure to obtain semi-finished socks;

[0013] Cleaning: The semi-finished socks are cleaned several times with deionized EDI ultrapure water;

[0014] Drying: Dry the semi-finished socks after multiple washings;

[0015] Shaping: Use a thermal shaping machine to shape the semi-finished socks to obtain disposable clean socks;

[0016] Among them, all the above processes are completed in a dust-free clean room that meets ISO 4-7 standards. The temperature of the dust-free clean room is 22℃±2℃ and the humidity is 55%±15%. For particles with a particle size ≥0.5 microns, the environmental cleanliness value of the dust-free clean room is APC≤100Counts / 2.83L.

[0017] Preferably, in the cleaning step, the resistivity of the deionized EDI ultrapure water is 17.6 MΩ±0.6 MΩ, LPC<20 counts / mL, IC<0.01 ug / mL, and NVR DIW<5.0 ug / mL.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The invention provides an environmentally friendly and degradable disposable clean socks. For particles with a particle diameter of ≥0.5 micron, the dust amount of the disposable clean socks in the air does not exceed 300 counts / piece; the disposable clean socks are woven from polylactic acid filaments.

[0020] The disposable clean socks provided by the present invention are made of polylactic acid filaments, which can reduce the production input of new materials, reduce the consumption of petroleum energy, and achieve energy saving and environmental protection. PLA It is a polymer compound formed by the polymerization reaction of lactic acid molecules, and its production process is pollution-free. PLA has good biodegradability and can be decomposed by microorganisms in the natural environment, and finally converted into carbon dioxide and water. Compared with traditional polyester fibers, PLA biodegradable agents have less impact on the environment after treatment, can reduce the accumulation of plastic waste and damage to the ecosystem, and can be recycled in nature. It is an ideal and preferred green polymer material. In terms of material selection, the production process of filaments is continuous, and long filaments are produced directly from the spinning machine. Compared with staple fibers, filaments have a smooth surface, less hairiness, and less dust, because the fibers are continuous, less broken or falling, and have a high breaking strength.

[0021] On the other hand, for particles with a diameter of ≥0.5 microns, the amount of dust generated in the air by disposable clean socks does not exceed 300 counts / piece. It is an environmentally friendly, degradable, low-dust, high-cleanliness, smooth and hairless disposable clean socks. This product is designed for one-time use to ensure cleanliness during use, and is particularly suitable for dust-free clean workshops that require high cleanliness. One-time use avoids the problem of cleaning and reusing the socks used by workshop employees, ensuring cleanliness every time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings, wherein:

[0023] Figure 1 It is a structural schematic diagram of the environmentally friendly and degradable disposable clean socks of the present invention;

[0024] Figure 2 is a schematic diagram of the plain weft knitted structure of the present invention;

[0025] Figure 3 This is a biodegradation experiment of the fabric of the environmentally friendly and degradable disposable clean socks of the present invention;

[0026] In the figure:

[0027] 10-sock body, 11-sock tube, 12-sock heel, 13-sock body, 14-sock toe. DETAILED DESCRIPTION

[0028] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0029] like Figure 1-2 As shown, the preferred structure of the environmentally friendly and degradable disposable clean socks of the present invention.

[0030] Embodiment 1

[0031] like Figure 1 As shown, the environmentally friendly and degradable disposable clean socks include a sock body 10, which is woven from polylactic acid filaments. In the present invention, the sock body at least includes a sock head 14, a sock body 13, a sock heel 12 and a sock tube 11.

[0032] In another embodiment, the sock body at least includes a sock head, a sock body, a sock heel, a sock tube and a sock opening, that is, the entire sock is made of the same chemical fiber filament.

[0033] In the present invention, polylactic acid is referred to as PLA. PLA is a polymer compound formed by polymerization of lactic acid molecules, and its production process is pollution-free. PLA can be extracted from plants such as corn starch and sugar cane, so polylactic acid is considered to be a biodegradable plastic. PLA has good biodegradability and can be decomposed by microorganisms in the natural environment and eventually converted into carbon dioxide and water. Compared with traditional polyester fibers, PLA biodegradable agents have less impact on the environment after treatment, can reduce the accumulation of plastic waste and damage to the ecosystem, can be circulated in nature, and are ideal and preferred green polymer materials. This material plays the same function as ordinary polyester materials when used, and has the same material properties as ordinary polyester materials. After use and disposal, it can be fully degraded by microorganisms in nature after 45 weeks of landfill through composting mode, and finally decomposed into carbon dioxide and water, without polluting the environment, which is very beneficial to protecting the environment and is a recognized environmentally friendly material. In terms of material selection, the production process of polylactic acid filaments is continuous, and long filaments are produced directly from the spinning machine. Compared with staple fibers, the filaments have a smoother surface, less hairiness, and less dust. Because the fibers are continuous, they are less likely to break or fall off, and have greater breaking strength.

[0034] The entire sock body is made of polylactic acid filaments, which are environmentally friendly and biodegradable, have low dust generation, high cleanliness, and a smooth surface without hairiness. This product is designed for one-time use to ensure cleanliness, and is particularly suitable for dust-free clean workshops that require high cleanliness. One-time use avoids the problem of washing and reusing socks for workshop employees, ensuring cleanliness every time.

[0035] In summary, the environmentally friendly and degradable disposable clean socks of the present invention have high cleanliness in a disposable manner, low dust generation, smooth surface and no hairiness, high tensile strength, and can provide a comfortable wearing experience. The design is simple and practical, and is particularly suitable for workplaces that require high cleanliness.

[0036] In a specific implementation, the disposable clean socks are woven from polylactic acid filaments of 75D / 36F specifications.

[0037] It should be noted that for 75D / 36F polylactic acid filament, 75D means the thickness of the yarn is 75 denier, D is denier, which is the weight of 9000 meters of yarn at the standard moisture regain, which can be used to quantify the thickness of the yarn; "36F" means that each strand of yarn is composed of 36 polylactic acid fibers.

[0038] Preferably, the disposable clean socks are woven from yarns twisted from double-ply 75D / 36F polylactic acid filaments.

[0039] It should be noted that the double-twisted yarn is specifically made by plying two strands of polyester filament yarn. In the specific production and weaving process, polylactic acid filaments are woven by plying (two yarns are put together and put into a knitting needle hole for weaving), and the two strands of polylactic acid filaments are continuously entangled with each other and woven synchronously, and the yarn feeding is driven by the mechanical operation of the equipment. Then the high-speed hosiery machine flat needle 144~400G process is used for knitting and weaving. The process has high weaving efficiency and moderate fabric density.

[0040] Specifically, the woven sock-shaped structure can be short socks, middle socks or long socks, which can effectively prevent pollutants from flowing out of people's feet and causing pollution to the clean workshop.

[0041] Preferably, the sock body adopts a single-layer plain weave structure with plain needles of 164G-380G.

[0042] It should be noted that plain stitch is a basic stitch for knitwear, usually also called single-sided knitting or single-sided plain stitch. Its characteristics are that the front side of the fabric is smooth, while the back side has raised small circles. Plain knitted fabrics have good stretchability and comfort.

[0043] Specifically, the parameter is 164G-380G, where "G" represents the needle density of the knitting machine, also known as "needle length" or "needle count". 164G means that the number of needles in one horizontal circle of the socks is 164. This parameter determines the density and fineness of the fabric. The higher the value, the denser the fabric, the finer the surface of the fabric will be, and it will usually be softer and smoother. The present invention adopts the plain needle 164G-380G, which can obtain a sock fabric with a higher density and a fine surface.

[0044] In a preferred embodiment, the sock body adopts a single-layer plain weft knitted structure with plain needles 164G-380G.

[0045] It should be noted that if Figure 2 As shown, the plain weft knitted structure is a basic structure of knitted fabrics. It has become an important structure in knitted fabrics due to its simple weaving process, good elasticity and comfortable wearing experience.

[0046] In a specific implementation, the present invention also provides a method for preparing recycled and environmentally friendly disposable clean socks, the method comprising:

[0047] Knitting socks: Weaving polylactic acid filaments with a plain weave structure to obtain semi-finished socks. The sock body of the semi-finished socks adopts a single-layer plain weft knitting structure with a plain needle of 164G-380G. Disposable clean socks are woven with yarns twisted from double-strand 75D / 36F polylactic acid filaments.

[0048] Cleaning: The semi-finished socks were cleaned multiple times with deionized EDI ultrapure water; during the cleaning step, the resistivity of the deionized EDI ultrapure water was 17.6 MΩ ± 0.6 MΩ, LPC < 20 counts / mL, IC < 0.01 ug / mL, and NVR DIW < 5.0 ug / mL.

[0049] Drying: Dry the semi-finished socks after multiple washings;

[0050] Shaping: Use a thermal shaping machine to shape the semi-finished socks to obtain disposable clean socks;

[0051] Among them, all the above processes are completed in a dust-free clean room that meets ISO 4-7 standards. The temperature of the dust-free clean room is 22℃±2℃ and the humidity is 55%±15%. For particles with a particle size ≥0.5 microns, the environmental cleanliness value of the dust-free clean room is APC≤100Counts / 2.83L.

[0052] In a specific implementation, the present invention also provides a specific implementation scheme for preparing disposable clean socks as follows, and the preparation method comprises:

[0053] Base material: The preferred high-cleanliness polymer compostable biodegradable polyester chemical fiber filament is used, with specifications of 75D\36F. The chemical fiber filament has high cleanliness, high strength (each monofilament fiber is continuous and uninterrupted), good wear resistance, smooth surface and not easy to produce hairiness, so it can produce clean socks with high cleanliness, low dust generation, smooth surface, no hairiness and high tensile strength. Polylactic acid is referred to as PLA. PLA is a polymer compound formed by polymerization of lactic acid molecules, and its production process is pollution-free. PLA can be extracted from plants such as corn starch and sugarcane, so polylactic acid is considered to be a biodegradable plastic. PLA has good biodegradability and can be decomposed by microorganisms in the natural environment and eventually converted into carbon dioxide and water. Compared with traditional polyester plastics, PLA biodegradable agents have less impact on the environment after treatment, can reduce the accumulation of plastic waste and damage to the ecosystem, and can be recycled in nature. It is an ideal and preferred green polymer material. This material has the same functions and properties as ordinary polyester materials when used. After it is discarded, it can be completely degraded by microorganisms in nature after 45 weeks of landfill through composting mode, and finally decomposed into carbon dioxide and water. It does not pollute the environment and is very beneficial to environmental protection. It is a recognized environmentally friendly material. Its degradation mechanism is as follows Figure 3 shown.

[0054] Sock weaving process / structure: high-speed plain needle 164G-380G single-layer plain knitting is used, with high weaving efficiency and moderate fabric density. The socks shaped structure woven out is short socks, mid-tube socks or long socks, which can effectively block the outflow of pollutants from people's feet and cause pollution to the clean workshop.

[0055] Production environment: All manufacturing processes are completed in a strictly controlled clean room area ISO 4-7 (10-10000 grade). The clean room area ISO 4-7 (10-10000 grade) controls the temperature at 22℃±2℃, the humidity at 55%±15%, and the environmental cleanliness value APC≥0.5μm is required to be controlled at ≤100Counts / 2.83L. The clothing, materials, and environment in the clean room area are strictly controlled in accordance with ISO 14644-1:2015 standards. Therefore, the socks produced in such a controlled environment have ultra-high cleanliness and ultra-low dust generation.

[0056] Washing and drying process: in a strictly controlled dust-free clean room area ISO 4-7 (10-10000 grade), use deionized EDI ultrapure water, the water quality requirements of which are resistivity (25℃) 17.6MΩ±0.6MΩ, LPC (≥0.5um) <20counts / mL, IC <0.01ug / mL, NVR DIW <5.0ug / mL. Use this high-cleanliness, low-ion deionized EDI ultrapure water to wash the socks multiple times and then dry them. The drying time is 40 minutes, the drying temperature is 90℃, and the cooling time is 20 minutes, so that semi-finished socks with ultra-high cleanliness and ultra-low dust generation are obtained.

[0057] Shaping process: In a strictly controlled dust-free clean room area ISO 4-7 (10-10000 grade), an ultra-clean thermal shaping machine is used to shape the socks to obtain finished socks with ultra-high cleanliness and ultra-low dust generation.

[0058] Packaging / quality inspection: In a strictly controlled dust-free clean room area ISO 4-7 (10-10000 grade), the socks are fully inspected for appearance quality and physical specifications. In a laboratory in a strictly controlled clean area certified by ISO / IEC 17025:2017, the cleanliness (APC) test and analysis are carried out before packaging. The result is an environmentally friendly, biodegradable, disposable clean socks with guaranteed quality and performance.

[0059] The environmentally friendly and degradable disposable clean socks of the present invention have the following advantages:

[0060] Serial number project Environmentally friendly biodegradable clean socks 2 Degradation performance Compostable Rapidly biodegradable 3 Degradation cycle <1 year (45 weeks) 4 Disposal methods Composting and landfill, natural biodegradation 5 Environmental compliance Environmental friendly 6 Cleanliness (APC) ≥ 0.5 μm ≤300counts\pcs 7 Socks surface effect Smooth surface without hairiness 8 tensile strength 280N 9 Wear-resistant More than 500 times

[0061] Through the above scheme, an environmentally friendly, degradable, low dust emission, high cleanliness, high strength, high wear resistance, smooth surface and no hairiness can be obtained. The environmentally friendly, degradable, disposable clean socks are disposable, and their main material is made of polylactic acid biodegradable material. After use and disposal, they can be completely degraded by microorganisms in nature after 45 weeks of landfill in the composting mode, and finally decompose carbon dioxide and water, without polluting the environment. It is very beneficial to environmental protection and is a recognized environmentally friendly material. It truly realizes environmental protection. The ultra-low dust emission and ultra-high cleanliness can effectively protect the dust-free clean workshop environment from pollution. It can be widely used to meet the use requirements of various clean and dust-free areas such as clean workshops, clean rooms, and laboratories.

[0062] Embodiment 2

[0063] The second embodiment provides an environmentally friendly and degradable disposable clean socks, the materials used and the product principle of which are exactly the same as those of the first embodiment. Specifically, the sock body of the second embodiment includes a sock head, a sock body, a sock heel and a sock tube, that is, the sock head, the sock body, the sock heel and the sock tube are all made of polylactic acid filaments. The sock opening of the sock is realized by another material + woven structure, and the sock opening is connected to the sock tube of the sock body.

[0064] It should be noted that the sock opening refers to the upper edge of the environmentally friendly and degradable disposable clean socks, which is connected to the sock tube part of the sock body.

[0065] In order to ensure the reliability of socks, and avoid the problems of socks being unreliable and loose due to the low elasticity of the sock opening, the sock opening of the present technology is woven from polylactic acid filaments and polycaprolactone yarns.

[0066] Through the above design, the addition of polycaprolactone yarn increases the elasticity and fit of the sock opening, making the socks more comfortable and better fitting the shape of the legs without being too tight or too loose. It prevents the sock opening from deforming or loosening, ensuring long-term wear and ensuring the use needs of clean rooms.

[0067] Preferably, the sock opening adopts a padded tissue structure.

[0068] It should be noted that the padding structure is a kind of knitted fabric pattern structure, in which one or more padding yarns are placed on the coil at a certain interval to form hanging arcs, and are connected by floating yarns on the reverse side of the fabric. Polycaprolactone yarn is used as the padding yarn, and the padding structure is to insert polycaprolactone yarn into the ordinary forward and reverse needles.

[0069] It should be noted that polycaprolactone (PCL for short) is a semi-crystalline polymer with good biodegradability and biocompatibility. It is a chemically synthesized biodegradable polymer material that can be prepared by ring-opening polymerization of ε-caprolactone monomer under the action of a catalyst. PCL has a low melting point (59-64°C) and high flexibility. It is a hydrophobic polymer that can be decomposed by microorganisms or enzymes, and the final products are carbon dioxide and water. PCL yarn, as a degradable and highly elastic fiber material, has a good application in the present invention.

[0070] Embodiment 3

[0071] The third embodiment provides an environmentally friendly and degradable disposable clean socks, the materials used and the product principle of which are exactly the same as those of the second embodiment. Specifically, the third embodiment is an optimization and improvement of the polylactic acid filament.

[0072] Specifically, the polylactic acid filament is a wrapped yarn of PLA yarn and PLA / PHBV filament. One PLA / PHBV filament wraps two PLA rovings, and the PLA / PHBV filament wraps the two PLA yarns under the action of twist (Z twist), wherein the linear density of the wrapped yarn is 18.5tex.

[0073] In one specific implementation, the PLA / PHBV filaments used have a linear density of 3.33 tex, a breaking strength of 104.9 cN, a breaking tenacity of 34.2 cN / dtex, and a breaking elongation of 33.25%.

[0074] It should be noted that PHBV is an aliphatic polyester synthesized by microorganisms, which is biodegradable and has good biocompatibility. It is produced by bacteria and can be digested by bacteria. It is completely decomposed into carbon dioxide, water and biomass under soil or composting conditions, and will not cause pollution to the environment. PLA / PHBV filament is a blended filament formed by PLA filament and PHBV filament, with a blending ratio of 80:20.

[0075] After testing, the actual twist of the wrapped yarn is 79.12 twists / 10cm, the breaking strength is 301.51cN, and the breaking elongation is 12.5%.

[0076] According to GB / T20944.3-2008 "Evaluation of antibacterial properties of yarns Part 3: Oscillation method", the antibacterial properties of the spun wrapped yarn are tested. If the antibacterial rate of the yarn against the bacteria is ≥70%, the yarn is considered to have antibacterial properties.

[0077] The test results show that the antibacterial rate of the wrapped yarn against Escherichia coli is 97.21%, the antibacterial rate against Staphylococcus aureus is 98.32%, and the antibacterial rate against Candida albicans is 98.11%.

[0078] In a preferred embodiment, the wrapped yarn is modified by using chitosan to modify the PLA yarn and PLA / PHBV filaments in the wrapped yarn. The specific method is as follows:

[0079] The twisted wrapped yarn was immersed in 80°C hot water for 1 hour for heat setting.

[0080] Weigh chitosan, put it into a soaking container, add 1% glacial acetic acid by mass, stir until chitosan is completely dissolved, and prepare a modified solution. The ratio of chitosan to glacial acetic acid is 200g chitosan per 1L glacial acetic acid. Then, 2% glutaraldehyde by mass is added dropwise to the modified solution, and the addition ratio of glutaraldehyde is 0.2L glutaraldehyde per 1L glacial acetic acid.

[0081] The heat-set wrapped yarn was immersed in the modified solution for 1 hour, then taken out and 2% by mass glutaraldehyde was evenly dripped on the wrapped yarn, and then placed in a fume hood for drying.

[0082] The invention adopts chitosan and appropriately cross-links it with glutaraldehyde to modify the polylactic acid filaments in the wrapping yarn. The high crystallinity of the polylactic acid fiber makes it have morphological stability and heat setting ability. After heat setting, the surface of the polylactic acid filament is smoother, the hairiness is reduced, the surface friction coefficient is greatly reduced, and the wrapping yarn after heat setting is more compact.

[0083] The test found that after the above modification treatment, the surface morphology of PLA yarn is better and smoother, which can improve the comfort of wearing and reduce discomfort. The elongation at break and elongation at break of the wrapped yarn are significantly increased, and the mechanical properties are better than those of the unmodified yarn. This makes the mechanical properties of the socks better and more comfortable to wear.

[0084] For other structures of the environmentally friendly and degradable disposable clean socks described in this embodiment, refer to the prior art.

[0085] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Therefore, any modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. An environmentally friendly and degradable disposable clean socks, characterized by: For particles with a diameter of ≥0.5 microns, the amount of dust generated in the air by disposable clean socks shall not exceed 300 counts / pair; Disposable clean socks are made of polylactic acid filaments.

2. The environmentally friendly and degradable disposable clean socks according to claim 1, characterized in that: The fabric structure of disposable clean socks is a plain weave structure.

3. The environmentally friendly and degradable disposable clean socks according to claim 2, characterized in that: The fabric structure of disposable clean socks is a single-layer plain weave structure with a plain needle of 164G-380G.

4. The environmentally friendly and degradable disposable clean socks according to claim 1, characterized in that: Disposable clean socks are made of 75D / 36F polylactic acid filaments.

5. The environmentally friendly and degradable disposable clean socks according to any one of claims 1 to 4, characterized in that: The disposable clean socks are prepared by the following method: Weaving socks: using polylactic acid filaments to weave in a plain weave structure to obtain semi-finished socks; Cleaning: The semi-finished socks are cleaned several times with deionized EDI ultrapure water; Drying: Dry the semi-finished socks after multiple washings; Shaping: Use a thermal shaping machine to shape the semi-finished socks to obtain disposable clean socks; All the above processes are completed in a clean room that meets ISO 4-7 standards. The temperature of the clean room is 22℃±2℃ and the humidity is 55%±15%. For particles with a diameter of ≥0.5 microns, the environmental cleanliness value of the clean room is APC≤ 100Counts / 2.83L.

6. The environmentally friendly and degradable disposable clean socks according to claim 5, characterized in that: During the cleaning step, the resistivity of deionized EDI ultrapure water was 17.6 MΩ ± 0.6 MΩ, LPC < 20 counts / mL, IC < 0.01 ug / mL, and NVR DIW < 5.0 ug / mL.

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