A type of rinseable dry wipe

Abstract

This invention discloses a flushable dry towel, relating to the technical field of dry towels. The invention uses superabsorbent short fibers and wood pulp short fibers as main raw materials. These main raw materials are applied to a water-soluble gel composition using a two-step method. The superabsorbent short fiber content is 13wt%-55wt%, the wood pulp short fiber content is 40wt%-85wt%, and the water-soluble gel content is 2wt%-11wt%. The water-soluble gel composition includes at least 4%-5% PVA, 3%-5% sodium sulfate, and 2%-3% borax. Implementing this method can effectively improve dry strength by more than 100% without affecting the flushability, and reduces lint shedding without affecting water absorption.

Description

Technical Field

[0001] This invention relates to the technical field of dry wipes, specifically a washable dry wipe. Background Technology

[0002] Dry wiping wipes, used for wiping in a dry state, have been replaced by lint-free wipes to reduce lint. Lint-free wipes are made from a large amount of thermoplastic fibers, which are bonded together using a thermal bonding method to achieve the purpose of not shedding lint. Although they do not shed lint, have a stiff feel, and are strong enough, they are not easily biodegradable and are not environmentally friendly.

[0003] In terms of raw material selection, flushable nonwoven materials mainly choose natural fibers and regenerated cellulose fibers, such as wood pulp fibers, cotton fibers, viscose fibers, and lyocell fibers. These fibers have good biodegradability and are considered environmentally friendly fibers. Furthermore, to achieve flushability, pulp fibers must account for at least 70%. Pulp fibers are brittle and, when used dry, produce a large amount of fiber debris, resulting in a feeling of incomplete cleaning and affecting aesthetics. Therefore, a flushable dry cleaning cloth is proposed. Summary of the Invention

[0004] To address the aforementioned problems, specifically those raised in the background section, this invention provides a washable dry towel, using superabsorbent short fibers and wood pulp short fibers as main raw materials. The main raw materials are applied to a water-soluble gel composition using a two-step process. The superabsorbent short fiber content is 13wt%-55wt%, the wood pulp short fiber content is 40wt%-85wt%, and the water-soluble gel content is 2wt%-11wt%. The water-soluble gel composition includes at least 4%-5% PVA, 3%-5% sodium sulfate, and 2%-3% borax.

[0005] A further feature of the present invention is that the superabsorbent short fiber is viscose fiber.

[0006] A further provision of the present invention is that the water-soluble gel composition further comprises no more than 3% carboxymethyl cellulose.

[0007] A further provision of the present invention is that the two-step method is as follows: first, after the main raw materials are wet-laid and hydroentangled, PVA or a mixed aqueous solution of PVA containing carboxymethyl cellulose is sprayed at a ratio of 1:1 with the weight of the nonwoven fabric, and then dried. Next, a mixed aqueous solution of sodium sulfate and borax is sprayed again at a ratio of 1:1 with the weight of the nonwoven fabric, and finally dried again.

[0008] The beneficial technical effects of this invention are as follows: the flushable dry wipe has a dry breaking strength increased by more than 100%, a thick and firm feel, does not shed lint, and has a water absorption of ≥800g / m2. The weight of the flushable dry wipe is 40-120g per square meter. Furthermore, it utilizes PVA, carboxymethyl cellulose, sodium sulfate, and borax. Although these substances are common, they must be used in a certain ratio to achieve the desired effect. This not only improves the dry strength and prevents the wipe from breaking when wiping small amounts of water-containing dirt, but also allows it to dissolve and disperse in large amounts of water when thrown into the toilet.

[0009] Using PVA / carboxymethyl cellulose alone on nonwoven fabrics can improve dry strength, but it is water-soluble and dissolves in water, so it will break when wiping wet substances and cannot be used.

[0010] However, PVA reacts with sodium sulfate and borax to form a gel, which hardens after drying. This gel retains its strength in small amounts of water and will not break when wiping small amounts of wet dirt. But when flushed down a toilet with a large amount of water, the gel dissolves, thus becoming flushable. Detailed Implementation

[0011] Preferred embodiments of the present invention will now be described. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0012] Example 1

[0013] Process flow: Material preparation - Wet web forming - Hydroentangling reinforcement - Spraying ① - Drying - Spraying ② - Drying - Finished product

[0014] Material ratio: viscose fiber 20wt%

[0015] 80wt% wood pulp fiber

[0016] Spraying ① The water-soluble gel is 5% PVA, sprayed at a ratio of 1:1 with the weight of the nonwoven fabric, and then dried;

[0017] Spraying ② The water-soluble gel composition is a mixed aqueous solution of 4% sodium sulfate and 3% borax. It is sprayed at a ratio of 1:1 with the weight of the nonwoven fabric to obtain a washable dry wiping cloth according to the process flow, and then dried again.

[0018] Example 2

[0019] Process flow: Material preparation - Wet web forming - Hydroentangling reinforcement - Spraying ① - Drying - Spraying ② - Drying - Finished product

[0020] Material ratio: viscose fiber 30wt%

[0021] 70wt% wood pulp fiber

[0022] Spraying ① The water-soluble gel is 4% PVA, sprayed at a ratio of 1:1 with the weight of the nonwoven fabric, and then dried;

[0023] Spraying ② The water-soluble gel composition is a mixed aqueous solution of 3% sodium sulfate and 2% borax. It is sprayed at a ratio of 1:1 with the weight of the nonwoven fabric to obtain a washable dry wiping cloth according to the process flow, and then dried again.

[0024] Example 3

[0025] Process flow: Material preparation - Wet web forming - Hydroentangling reinforcement - Spraying ① - Drying - Spraying ② - Drying - Finished product

[0026] Material ratio: viscose fiber 30wt%

[0027] 70wt% wood pulp fiber

[0028] Spraying ① The water-soluble gel is a mixed aqueous solution of 1% carboxymethyl cellulose and 3% PVA, sprayed at a ratio of 1:1 with the weight of the nonwoven fabric, and then dried;

[0029] Spraying ② The water-soluble gel composition is a mixed aqueous solution of 5% sodium sulfate and 2% borax. It is sprayed at a ratio of 1:1 with the weight of the nonwoven fabric. The dry wiping cloth can be prepared according to the process flow and then dried again.

[0030] The implementation sample was tested according to the national standard for washable nonwoven fabrics.

[0031] Table 1 Example Scheme Detection Data

[0032]

[0033] The blank sample is a nonwoven fabric that has not used this scheme.

[0034] The data comparison in the table above shows that implementing this solution can effectively improve dry strength by more than 100%, without affecting the washability or water absorption. Shedding is reduced to within 0.1 g / m². Thickness is increased by more than 5%.

[0035] The reason for using a two-step method is that PVA, carboxymethyl cellulose, sodium sulfate, and borax cannot be directly mixed and sprayed onto the nonwoven fabric. This is because PVA reacts directly with sodium sulfate and borax to form a gel, which is too viscous to spray and prevents the fibers from bonding. Furthermore, after the first step of spraying PVA, drying is necessary to allow the fibers to bond. If not dried, the second step of spraying will immediately form a gel upon contact with sodium sulfate and borax, and subsequent drying will also fail to achieve the desired fiber bonding. Therefore, only a two-step spraying and two-step drying process can achieve the desired effect. Moreover, PVA, sodium sulfate, and borax must all be present in this process to function effectively; none can be omitted.

[0036] Although the invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0037] In the description of this invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, articles, or apparatus / devices.

[0040] The technical solution of the present invention has been described in conjunction with preferred embodiments. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions resulting from these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A washable dry towel, made primarily of superabsorbent short fibers and wood pulp short fibers, characterized in that: The main raw materials are applied separately in a two-step process to form a water-soluble gel composition, wherein the content of superabsorbent short fibers is 13wt%-55wt%, the content of wood pulp short fibers is 40wt%-85wt%, and the content of water-soluble gel is 2wt%-11wt%; the water-soluble gel composition includes at least 4%-5% PVA, 3%-5% sodium sulfate, and 2%-3% borax. The two-step method involves first spraying PVA at a ratio of 1:1 with the weight of the nonwoven fabric after the main raw material has undergone wet web forming and hydroentangling reinforcement, then drying it, and finally spraying it again at a ratio of 1:1 with the weight of the nonwoven fabric with a mixed aqueous solution of sodium sulfate and borax, and finally drying it again.

2. The flushable dry towel according to claim 1, characterized in that: The superabsorbent short fiber is viscose fiber.

3. The washable dry towel according to claim 1, characterized in that: The water-soluble gel composition also includes no more than 3% carboxymethyl cellulose.

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