CN116988223A - Reinforced flushable fiber material and preparation method thereof - Google Patents
Reinforced flushable fiber material and preparation method thereof Download PDFInfo
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- CN116988223A CN116988223A CN202310823184.0A CN202310823184A CN116988223A CN 116988223 A CN116988223 A CN 116988223A CN 202310823184 A CN202310823184 A CN 202310823184A CN 116988223 A CN116988223 A CN 116988223A
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Classifications
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
- D04H1/46—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
- D04H1/492—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres by fluid jet
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
- D04H1/46—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
- D04H1/492—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres by fluid jet
- D04H1/495—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres by fluid jet for formation of patterns, e.g. drilling or rearrangement
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Nonwoven Fabrics (AREA)
Abstract
The invention relates to the field of non-woven materials, and discloses a reinforced flushable fiber material and a preparation method thereof. The flushable fibrous material comprises a fiber collection zone formed by randomly arranging and intertwining fibers; a plurality of fiber aggregation bodies are arranged in the fiber aggregation area; the fiber stacking density in the fiber aggregation body is greater than the average fiber stacking density in the fiber aggregation area; the thickness of the fiber aggregate is greater than the thickness of the non-fiber aggregate in the fiber aggregate region. The flushable fiber material has better flushability and wet breaking strength, and meanwhile, when the fiber materials are stacked, the contact area between two adjacent flushable fiber materials is smaller, so that the fiber materials can be easily extracted, and the fiber materials are endowed with plump and soft handfeel.
Description
Technical Field
The invention relates to the field of non-woven materials, in particular to a reinforced flushable fiber material and a preparation method thereof.
Background
The wet toilet paper is an emerging flushable wet toilet paper. Compared with the common traditional toilet paper, the cleanliness and the comfort of the toilet paper are gradually accepted by consumers, the revolutionary new product in the toilet paper industry becomes a consumption hot spot, the demand quantity is increased in an explosive manner, and the toilet paper becomes a necessary household sanitary article for pursuing quality of life families. At present, most of materials used for producing wet toilet paper are flushable fiber materials such as flushable spunlaced non-woven fabrics, and some products are glued dust-free paper and the like.
For the flushable fiber material, the flushable fiber material is required to have certain breaking strength in a wet state so as to meet the requirements of product processing and product use, and meanwhile, the product is required to be rapidly dispersed in water after use so as to prevent a drainage system from being blocked. Therefore, how to solve the contradiction between the flushability and breaking strength of the material is a technical key in the research and development of the product. The existing product still has the problems that the wet strength is low, the use of the product is affected, or the flushability is not up to the standard, and the sewer system is blocked.
In addition, as consumer demand has increased, consumers have placed new demands on the comfort, convenience and feel of the product. The cellulose fiber material used by the existing wet toilet paper is very strong in water absorption, and the problems that two adjacent pieces of wet toilet paper are tightly adhered together, so that the wet toilet paper is inconvenient to extract, breakage is easy to occur, a plurality of pieces of wet toilet paper are extracted simultaneously and the like often occur. And, because each piece of wet toilet paper is adhered to each other too tightly, the stacking density of finished fibers is overlarge and the thickness is lower. And for the material with the same specification, the higher thickness not only can make the material become plump and soft and improve the use comfort of the product, but also can improve the thickness of the wet toilet paper finished product, promote the 'selling phase' of the product and improve the market competitiveness of the product.
For example, patent CN201810116131.4 discloses a flushable nonwoven material and a preparation method thereof, wherein the flushable nonwoven material is prepared from 50-70 of wood pulp fibers, 30-50 of viscose fibers and an adhesive, and the preparation method comprises the steps of dispersing, beating, lapping, dewatering, drying and the like. The flushable nonwoven material provided by the proposal can be rapidly dispersed under the action of water impact and can be 100 percent biodegraded, but has lower wet breaking strength (69 g/m) 2 The transverse wet strength of the product is 7.32N/5cm, and two adjacent non-woven materials which can be scattered are easy to adhere to each other and are too tight.
Disclosure of Invention
The invention provides a reinforced flushable fiber material and a preparation method thereof, aiming at solving the technical problems that the conventional flushable fiber material is difficult to achieve flushability and wet breaking strength and two adjacent sheets are easy to adhere to each other and are too tight. The flushable fiber material has better flushability and wet breaking strength, and meanwhile, when the fiber materials are stacked, the contact area between two adjacent flushable fiber materials is smaller, so that the fiber materials can be easily extracted, and the fiber materials are endowed with plump and soft handfeel.
The specific technical scheme of the invention is as follows:
in a first aspect, the present invention provides a reinforced flushable fibrous material comprising a fiber collection region of randomly arranged fibers intertwined with one another; a plurality of fiber aggregation bodies are arranged in the fiber aggregation area; the fiber stacking density in the fiber aggregation body is greater than the average fiber stacking density in the fiber aggregation area; the thickness of the fiber aggregate is greater than the thickness of the non-fiber aggregate in the fiber aggregate region.
In the existing flushable fiber materials, the packing density and the material thickness of the common fibers are the same, so that the influence of the fiber structure on the breaking strength of the fiber structure is limited. The invention changes the internal structure of the prior flushable fiber material with uniform density and same thickness, and a plurality of fiber aggregation bodies with higher fiber stacking density and larger thickness are arranged in the flushable fiber material body at intervals. Because the fiber stacking density in the fiber aggregation body is higher than that in the outside of the fiber aggregation body, the probability of mutual entanglement and fixation between fibers in the fiber aggregation body is higher, the overall breaking strength of the material can be improved, and the problem that the wet breaking strength of the existing flushable fiber material is low is solved.
Because the thickness of the material in the fiber aggregation body is higher than that of the material outside the fiber aggregation body, the fiber aggregation body protrudes out of the surface of the material, and the arrangement is favorable for changing the fiber arrangement in the process of processing to form the fiber aggregation body, enhancing the aggregation of the fibers and improving the fiber stacking density, thereby improving the breaking strength of the flushable fiber material. Meanwhile, the fiber aggregation body protrudes out of the surface of the material, so that when the product is put into water after being used, the fiber aggregation body can be impacted greatly by water flow, and the whole product has good flushability.
In addition, when the multi-layer flushable fiber materials are stacked, as the surface of the materials is provided with the bulges (fiber aggregation bodies), the contact area of two adjacent layers of materials is correspondingly reduced, the probability of mutual adhesion of the materials is reduced, and the problems that the prior flushable fiber materials are difficult to extract, are easy to damage during extraction, are simultaneously extracted from a plurality of materials and the like are solved. Meanwhile, the arrangement of the fiber aggregation body increases the space between two adjacent layers of flushable fiber materials, and can reduce the average fiber stacking density of the materials on the whole, thereby improving the thickness of the materials, being beneficial to improving the softness of the materials, leading the products to become plump and improving the 'selling phase' of the products.
Preferably, the minimum projected area of the individual fiber aggregate is 0.7 to 20mm 2 。
In the invention, a plurality of fiber aggregation bodies with high fiber stacking density are arranged in the flushable fiber material to be the basis for improving the breaking strength of the material, and the structural size of the fiber aggregation bodies can influence the effect of improving the breaking strength of the material. Through research, the team of the invention finds that: under the condition that the unit area and the mass are the same, if the projection area of the fiber aggregation body is too large, the fiber is not easy to form aggregation effect in the material processing process, the average fiber stacking density of the material is not increased, but obviously reduced, and the uniformity of the cloth cover is poor due to unbalanced fiber distribution; in addition, under the condition of the same mass per unit area, if the projected area of the fiber aggregate is too large, the fiber distribution is uneven, so that the breaking strength (particularly wet strength) of the material is obviously reduced, and the use of the product is affected. If the projected area of the fiber aggregate is too small, the fiber aggregate space is limited, the fiber stacking density is low, the fiber entanglement efficiency is low, and the improvement of the breaking strength of the material is also not facilitated. Based on this, the present invention has determined the optimum range of the minimum projected area of the above-mentioned fiber aggregate, within which the breaking strength of the flushable fiber material can be improved to a greater extent by using the fiber aggregate.
Preferably, the sum of the projected areas of all of the fiber aggregates on the surface of the flushable fibrous material in the fiber aggregate region is 30 to 60% of the projected area of the fiber aggregate region on the surface of the flushable fibrous material.
Although increasing the sum of the projected areas of the fiber aggregates within a certain range is beneficial to improving the breaking strength of the material, the uniformity of the material and the feasibility of processing are considered at the same time, so that the research and development team determines the optimal range of the ratio of the sum of the projected areas of the fiber aggregates to the total projected area of the fiber aggregate area on the basis of intensive research.
Preferably, the projection of the individual fiber aggregates onto the surface of the flushable fibrous material is one or more of circular, arcuate and polygonal.
The projected shape of the fiber aggregate not only determines the appearance effect of the material, but also affects the entanglement efficiency of the fibers and the flushable property of the material. When the projection shape of the fiber aggregation body is polygonal, the product can generate larger resistance to water flow when being put into water after being used, thereby being beneficial to the dispersion of the product in water.
Further, all or a portion of the fiber aggregation body has a polygonal projected shape on the surface of the flushable fiber material.
Preferably, the fiber collecting area is also provided with a plurality of fiber leveling areas; the fiber stacking density in the fiber leveling area is smaller than the fiber stacking density in the fiber aggregation area and is larger than the fiber stacking density at the non-fiber aggregation position in the fiber aggregation area; the thickness of the fiber leveling zone is less than the thickness of the fiber aggregation body and greater than the thickness of the non-fiber aggregation body in the fiber aggregation zone.
Since the thickness of the fiber leveling zone is smaller than the fiber aggregation, a concave surface can be formed on the surface of the material; at the same time, the fiber finishing zone has a higher thickness and packing density than the non-fiber aggregate in the fiber aggregate zone, thus imparting a certain breaking strength to the material. Therefore, the arrangement of the fiber leveling area can ensure breaking strength of the flushable fiber materials, and simultaneously increase the pore space between the upper and lower adjacent two sheets of materials during stacking, so that the contact area of the two adjacent sheets of materials is reduced, mutual adhesion between the two adjacent sheets of materials is reduced, the problems that the flushable fiber materials are difficult to extract and easy to break and a plurality of materials are simultaneously extracted and the like can be better solved, and meanwhile, the average fiber stacking density of the materials is reduced on the whole, and the thickness of the materials is increased, so that the materials are plump and soft.
Further, each fiber leveling zone is surrounded by a plurality of fiber aggregation bodies.
Further, the projected area of the individual fiber organizer regions on the surface of the flushable fibrous material is greater than the projected area of the individual fiber aggregates on the surface of the flushable fibrous material.
Each fiber leveling area is formed by encircling a plurality of fiber aggregation bodies, and the projection area of each single fiber leveling area is larger than that of each single fiber aggregation body, so that the contact area of two adjacent pieces of flushable fiber materials is reduced to a greater extent, the fiber aggregation bodies are easier to extract, and the material feel is plump and soft.
Further, the ratio of the projected area of the individual fiber-leveling zone on the surface of the flushable fibrous material to the projected area of the individual fiber aggregate on the surface of the flushable fibrous material is (10 to 80):1.
Preferably, the average fiber packing density of the flushable fibrous material in the dry state is 0.08 to 0.11g/cm 3 。
Preferably, the strength ratio of the dry machine direction to the transverse direction of the flushable fibrous material is (1.4 to 2.5) to 1, and the strength ratio of the wet machine direction to the transverse direction is (1.1 to 1.8) to 1.
The invention uses the arrangement of the fiber aggregation body, can reduce the average fiber stacking density of the flushable fiber material, so that the fiber material has plump and soft hand feeling, and can reduce the longitudinal and transverse strength ratio of the material, so that the fiber aggregation body is more isotropic, and the material is extracted and broken in the using process.
Preferably, the flushable fibersThe mass per unit area of the material is 35-90 g/m 2 。
Preferably, the fibers in the fiber collection region are degradable fibers.
Further, the degradable fibers comprise cellulosic fibers.
Further, the cellulosic fibers comprise plant pulp fibers; the plant pulp fiber accounts for 50-85% of the total mass of the flushable fiber material.
Further, the degradable fiber comprises an ultra-short fiber with the length of 3-15 mm.
In a second aspect, the present invention provides a method for preparing the flushable fibrous material, comprising the steps of:
(1) Forming the fibers into a web;
(2) Feeding the fiber web into a reinforcing mechanism for preliminary consolidation;
(3) And (3) feeding the fiber web after preliminary consolidation into a gathering mechanism, placing the fiber web on a fiber gathering template, and impacting the fiber web by adopting mechanical force to enable part of fibers in the fiber web to move and gather to form a fiber gathering body.
The invention adopts a mode of applying mechanical force to form a fiber aggregation body, and during the process, part of fibers in the fiber web change the arrangement direction and are gathered together, thereby forming the fiber aggregation body. The formation of a plurality of fiber aggregates can lead the arrangement of fibers in the material to be more random, thereby reducing the difference of the longitudinal and transverse strength of the flushable fiber material and leading the material to be more isotropic, which is beneficial to reducing the extraction and breaking of the material in the use process and is more convenient for consumers to use.
Preferably, in step (1), the fibers are formed into a web by wet-laid.
Preferably, in the step (2), the primary consolidation mode is water jet consolidation.
Preferably, in step (2), the mechanical force is used to impact the web, so that part of the fibers in the web are moved and gathered to form a fiber aggregate, and a fiber leveling zone is formed.
Preferably, in step (2), the mechanical force is provided by a high pressure water stream.
Preferably, after step (3), the web after formation of the fiber assembly is dried.
Terms and definitions used in the present invention:
(1) "degradable" in the present invention means "biodegradable (biodegrading)". I.e. degradation caused by biological activity, in particular the action of enzymes, causes a significant change in the chemical structure of the material. As the material is gradually digested by microorganisms or certain organisms as a nutrient source, the quality and performance losses such as physical property degradation and the like are caused, and finally, the material is decomposed into compounds or simple substances with simpler components such as carbon dioxide (CO) 2 ) Or/and methane (CH) 4 ) Water (H) 2 O) and mineralized inorganic salts of the elements contained therein, and new biomass (GB/T20197-2006).
(2) The "flushability" in the invention means that the product can keep the smoothness of the toilet bowl and the drainage pipeline system under the expected use condition, is compatible with the existing sewage conveying, treating, recycling, disposing and other systems, and the waste becomes unidentifiable within a reasonable time, and has the properties of being dispersible and degradable (GB/T40181-2021).
(3) The invention relates to a flushable fiber material which meets the requirement of 5.1 flushable performance in flushable spunlaced non-woven material and products (GB/T41244-2022).
Compared with the prior art, the invention has the following advantages:
(1) In the flushable fiber material, the fiber aggregation body with higher fiber stacking density and larger thickness is arranged in comparison with other areas, so that the breaking strength of the material can be improved while the flushability of the material is ensured, and the problem that the wet strength of the existing flushable fiber material is low is solved; on this basis, by controlling the minimum projected area of the individual fiber aggregate, the breaking strength of the material can be improved to a greater extent.
(2) In the flushable fiber material, the fiber aggregation body is arranged, so that the contact area between the upper and lower adjacent materials during stacking can be reduced, the mutual adhesion probability of the upper and lower adjacent materials is reduced, the materials are more conveniently extracted, and the breakage of the materials during extraction is prevented; on the basis, by arranging the fiber leveling zone, the contact area between two adjacent sheets can be further reduced, so that the sheets are easy to extract.
(3) In the flushable fiber material, the contact area between two adjacent sheets of material during stacking is reduced by utilizing the fiber aggregation body and the fiber leveling zone, so that the average fiber stacking density of the material can be reduced on the whole, the thickness of the material is increased, and the material has softer and plump hand feeling and better use comfort and sales.
Drawings
FIG. 1 is a schematic front view of the reinforced flushable fibrous material of example 1;
FIG. 2 is a schematic front view of the reinforced flushable fibrous material of example 2;
FIG. 3 is a schematic front view of the reinforced flushable fibrous material of example 3;
FIG. 4 is a schematic side view of the reinforced flushable fibrous material of example 2.
The reference numerals are: a fiber collecting zone 1, a fiber collecting body 2 and a fiber leveling zone 3.
Detailed Description
The invention is further described below with reference to examples.
General examples
A reinforced flushable fibrous material, as shown in figures 1 to 4, comprising a fibre assembly zone 1 of randomly arranged fibres and intertwined with one another; a plurality of fiber aggregation bodies 2 are arranged in the fiber aggregation zone 1; the fiber stacking density in the fiber aggregation body 2 is greater than the average fiber stacking density in the fiber aggregation area 1; the thickness of the fiber aggregate 2 is greater than the thickness of the non-fiber aggregate in the fiber aggregate region 1.
As a specific embodiment, the minimum projection area of the individual fiber aggregation body 2 is 0.7-20 mm 2 The method comprises the steps of carrying out a first treatment on the surface of the Within the fiber collection zone 1, all of the fiber aggregation bodies 2 are availableThe sum of the projected areas on the surface of the flushable fibrous material is 30-60% of the projected area of the fiber collection zone 1 on the surface of the flushable fibrous material.
As a specific embodiment, in the same flushable fibrous material, the projection shapes of the fiber aggregates 2 on the surface of the flushable fibrous material may be identical or different from each other; the projected shape of the individual fiber aggregate 2 on the surface of the flushable fibrous material is one or more of a circle, an arc, and a polygon.
As a specific embodiment, a plurality of fiber leveling areas 3 are further arranged in the fiber collecting area 1; the fiber stacking density in the fiber leveling zone 3 is smaller than the fiber stacking density in the fiber aggregation body 2 and is larger than the fiber stacking density at the non-fiber aggregation body in the fiber aggregation zone 1; the thickness of the fiber leveling zone 3 is smaller than the thickness of the fiber aggregation body 2 and larger than the thickness of the non-fiber aggregation body in the fiber aggregation zone 1; each fiber leveling zone 3 is formed by encircling a plurality of fiber aggregation bodies 2; the projected area of the individual fiber arrangement regions 3 on the surface of the flushable fibrous material is greater than the projected area of the individual fiber aggregation bodies 2 on the surface of the flushable fibrous material.
As a specific embodiment, the ratio of the projected area of the individual fiber-leveling zone 3 on the surface of the flushable fibrous material to the projected area of the individual fiber aggregate 2 on the surface of the flushable fibrous material is (10 to 80):1.
As a specific embodiment, the average fiber packing density of the flushable fibrous material in the dry state is 0.08 to 0.11g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The dry state longitudinal and transverse fracture strength ratio of the flushable fiber material is (1.4-2.5) to 1, and the wet state longitudinal and transverse fracture strength ratio is (1.1-1.8) to 1; the mass per unit area of the flushable fiber material is 35-90 g/m 2 。
As a specific embodiment, the fibers in the fiber collection area 1 are degradable fibers; the degradable fibers comprise cellulosic fibers; the cellulose fibers comprise plant pulp fibers, wherein the plant pulp fibers account for 50-85% of the total mass of the flushable fiber material; the degradable fiber comprises an ultra-short fiber with the length of 3-15 mm.
A method of preparing the flushable fibrous material comprising the steps of:
(1) Forming the fibers into a web;
(2) Feeding the fiber web into a reinforcing mechanism for preliminary consolidation;
(3) And (3) feeding the fiber web after preliminary consolidation into a gathering mechanism, placing the fiber web on a fiber gathering template, and impacting the fiber web by adopting mechanical force to enable part of fibers in the fiber web to move and gather to form a fiber gathering body.
In a specific embodiment, in step (1), the fiber is formed into a fiber web by wet-forming.
In a specific embodiment, in the step (2), the primary consolidation mode is water jet consolidation.
In step (2), as a specific embodiment, mechanical force is used to impact the fiber web, so that part of fibers in the fiber web are moved and gathered to form a fiber aggregate, and a fiber leveling zone is formed.
As a specific embodiment, in step (2), the mechanical force is provided by a high pressure water flow.
In one embodiment, after step (3), the web after formation of the fiber assembly is dried.
Example 1
Reinforced flushable fiber material with mass per unit area of 35g/m 2 As shown in fig. 1, the fiber collecting zone 1 is composed of 50wt% of viscose ultrashort fibers and 50wt% of wood pulp fibers which are randomly arranged and intertwined; a plurality of fiber aggregation bodies 2 are arranged in the fiber aggregation zone 1; the fiber stacking density in the fiber aggregation body 2 is greater than the average fiber stacking density of the fiber aggregation area 1; the thickness of the fiber aggregate 2 is greater than the thickness of the non-fiber aggregate in the fiber aggregate region 1.
Wherein the minimum projected area of the individual fiber aggregate 2 is 0.7mm 2 The method comprises the steps of carrying out a first treatment on the surface of the The sum of the projected areas of the fiber aggregate 2 on the surface of the flushable fibrous material is the fiber aggregate30% of the projected area of zone 1 on the surface of the flushable fibrous material; the projection shape of each fiber aggregation body on the surface of the flushable fiber material is hexagonal; the fiber aggregate 2 had a distribution density of 330000 fibers/m in the fiber aggregate area 1 2 。
The average fiber packing density of the reinforced flushable fiber material in the dry state is 0.08g/cm 3 The ratio of the vertical and horizontal breaking strength in the dry state was 2.5:1, and the ratio of the vertical and horizontal breaking strength in the wet state was 1.8:1. The length of the viscose ultra-short fiber is 12mm.
A preparation method of a reinforced flushable fiber material comprises the following steps:
(1) Mixing the viscose ultrashort fibers and wood pulp fibers according to a ratio of 50/50, and preparing a fiber web by adopting a wet-laid mode;
(2) Feeding the wet fiber net into a hydroentangling machine for preliminary consolidation;
(3) The fiber web after preliminary hydroentangled consolidation is sent into a gathering mechanism, so that the fiber web is placed on a fiber gathering template, and the fiber web is impacted by high-pressure water flow, so that part of fibers in the fiber web are moved and gathered to form a fiber gathering body 2;
(4) Drying the web, and rolling to obtain a product of 35g/m 2 The reinforced type can be used for dispersing fiber materials.
Example 2
Reinforced flushable fiber material with unit area mass of 60g/m 2 As shown in fig. 2 and 4, the fiber collecting zone 1 is composed of 20wt% of tencel ultrashort fibers and 80wt% of wood pulp fibers which are randomly arranged and intertwined; a plurality of fiber aggregation bodies 2 are arranged in the fiber aggregation zone 1; the fiber stacking density in the fiber aggregation body 2 is greater than the average fiber stacking density of the fiber aggregation area 1; the thickness of the fiber aggregate 2 is greater than the thickness of the non-fiber aggregate in the fiber aggregate region 1.
A plurality of fiber leveling areas 3 are also arranged in the fiber collecting area 1, and each fiber leveling area 3 is formed by encircling 4 fiber collecting bodies 2; the fiber packing density in the fiber leveling zone 3 is smaller than the fiber packing density in the fiber aggregation body 2 and is larger than the fiber packing density in the fiber aggregation zone 1 at the non-fiber aggregation body; the thickness of the material in the fiber leveling zone 3 is smaller than that in the fiber aggregation body 2 and larger than that in the fiber aggregation zone 1 at the position of non-fiber aggregation body; the thickness of the material in each fiber leveling zone 3 is the same; the ratio of the projected area of the single fiber-straightening zone 3 on the surface of the flushable fibrous material to the projected area of the fiber aggregate 2 on the surface of the flushable fibrous material was 40:1.
Wherein the minimum projected area of the individual fiber aggregate 2 is 8mm 2 The method comprises the steps of carrying out a first treatment on the surface of the The sum of the projection areas of the fiber aggregation bodies 2 on the surface of the flushable fiber material is 50% of the projection area of the fiber aggregation zone 1 on the surface of the flushable fiber material; the projections of the fiber aggregation bodies 2 on the surface of the flushable fiber material are different from each other, the projections of the 4 fiber aggregation bodies 2 surrounding each fiber leveling zone 3 form a heart shape, and the projections of the rest fiber aggregation bodies 2 are all round. In the fiber collecting region 1, the distribution density of the fiber aggregates 2 was 28000 pieces/m in the region other than the fiber leveling region 3 and the 4 fiber aggregates 2 surrounding the fiber leveling region 2 The method comprises the steps of carrying out a first treatment on the surface of the In the fiber collecting zone 1, the distribution density of the fiber leveling zone 3 was 995/m 2 . The average fiber bulk density in the fiber aggregate 2 in the dry state was 0.099g/cm 3 Thickness is 0.665mm; the average fiber bulk density in the fiber leveling zone 3 in the dry state was 0.09g/cm 3 The thickness is 0.65mm; a mean fiber bulk density of 0.089g/cm in the dry state at the non-fiber aggregation and non-fiber leveling zone 3 The thickness was 0.642mm.
The average fiber packing density of the reinforced flushable fiber material in the dry state is 0.094g/cm 3 The ratio of the dry strength to the transverse strength at break was 1.8:1, and the ratio of the wet strength to the transverse strength at break was 1.43:1. The length of the tencel ultra-short fiber is 10mm.
A preparation method of a reinforced flushable fiber material comprises the following steps:
(1) Mixing 20% of tencel ultrashort fibers and 80% of wood pulp fibers according to a certain proportion, and preparing a fiber net by adopting a wet-method net forming mode; (2) Feeding the wet fiber net into a hydroentangling machine for preliminary consolidation;
(3) Feeding the fiber web after preliminary consolidation into a gathering mechanism, placing the fiber web on a fiber gathering template, impacting the fiber web by adopting high-pressure water flow, enabling part of fibers in the fiber web to move and gather to form a fiber gathering body 2, and forming a fiber leveling zone 3 in the fiber web at the same time;
(4) Drying the web, and rolling to obtain a product of 60g/m 2 The reinforced type can be used for dispersing fiber materials.
Example 3
Reinforced flushable fiber material with unit area mass of 90g/m 2 As shown in fig. 3, the fiber collecting zone 1 is composed of 30wt% of bamboo pulp ultrashort fibers and 70wt% of wood pulp fibers which are randomly arranged and intertwined; a plurality of fiber aggregation bodies 2 are arranged in the fiber aggregation zone 1; the fiber stacking density in the fiber aggregation body 2 is greater than the average fiber stacking density of the fiber aggregation area 1; the thickness of the fiber aggregate 2 is greater than the thickness of the non-fiber aggregate in the fiber aggregate region 1.
A plurality of fiber leveling areas 3 are also arranged in the fiber collecting area 1, and each fiber leveling area 3 is formed by encircling 5 fiber collecting bodies 2; the fiber packing density in the fiber leveling zone 3 is smaller than the fiber packing density in the fiber aggregation body 2 and is larger than the fiber packing density in the fiber aggregation zone 1 at the non-fiber aggregation body; the thickness of the material in the fiber leveling zone 3 is smaller than that in the fiber aggregation body 2 and larger than that in the fiber aggregation zone 1 at the position of non-fiber aggregation body; the thickness of the material in each fiber leveling zone 3 is the same; the ratio of the projected area of the single fiber-straightening zone 3 on the surface of the flushable fibrous material to the projected area of the fiber aggregate 2 on the surface of the flushable fibrous material was 10:1.
Wherein the minimum projected area of the individual fiber aggregate 2 is 20mm 2 The method comprises the steps of carrying out a first treatment on the surface of the The sum of the projection areas of the fiber aggregation bodies 2 on the surface of the flushable fiber material is 60 percent of the projection area of the fiber aggregation zone 1 on the surface of the flushable fiber material; the projections of the fiber aggregation bodies 2 on the surface of the flushable fiber material are mutually different, the projections of the 5 fiber aggregation bodies 2 surrounding each fiber leveling zone 3 form a flower shape, and the projections of the other fiber aggregation bodies 2 are all round. In the fiber collecting region 1, inThe distribution density of the fiber aggregate 2 in the region other than the fiber leveling zone 3 and the 5 fiber aggregates 2 surrounding the fiber aggregate is 13000 pieces/m 2 The method comprises the steps of carrying out a first treatment on the surface of the In the fiber collecting zone 1, the fiber leveling zone 3 had a distribution density of 1300 pieces/m 2 . The average fiber bulk density in the fiber aggregate 2 in the dry state was 0.113g/cm 3 The thickness is 0.924mm; the average fiber bulk density in the fiber leveling zone 3 in the dry state was 0.10g/cm 3 Thickness is 0.910mm; a mean fiber bulk density of 0.092g/cm in the dry state at the non-fiber aggregation and non-fiber leveling zone 3 The thickness was 0.895mm.
The average fiber packing density of the reinforced flushable fiber material in the dry state is 0.10g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The ratio of the vertical and horizontal fracture strength of the dry state is 1.4:1; the wet longitudinal and transverse fracture strength ratio of the reinforced flushable fiber material is 1.1:1; the length of the bamboo pulp ultrashort fiber is 12mm.
A preparation method of a reinforced flushable fiber material comprises the following steps:
(1) Mixing 30% of bamboo pulp ultrashort fibers and 70% of wood pulp fibers according to a certain proportion, and preparing a fiber net by adopting a wet-method net forming mode; (2) Feeding the wet fiber net into a hydroentangling machine for preliminary consolidation;
(3) Feeding the fiber web after preliminary consolidation into a gathering mechanism, placing the fiber web on a fiber gathering template, impacting the fiber web by adopting high-pressure water flow, enabling part of fibers in the fiber web to move and gather to form a fiber gathering body 2, and forming a fiber leveling zone 3 in the fiber web at the same time;
(4) Drying the web, and rolling to obtain a 90g/m product 2 The reinforced type can be used for dispersing fiber materials.
Example 4
The difference between this example and example 2 is that the minimum projected area of the individual fiber aggregate 2 is 0.3mm 2 。
Example 5
The difference between this example and example 2 is that the minimum projected area of the individual fiber aggregate 2 is 25mm 2 。
Comparative example 1
Water-jet nonwoven fabric capable of being punched and scattered, and the unit area mass is 60g/m 2 Is prepared from 20wt% of tencel ultrashort fibers (length of 10 mm) and 80wt% of wood pulp fibers through wet-laid and spun-laced reinforcement. The appearance of the material is a plain weave structure.
Comparative example 2
Water-jet nonwoven fabric capable of being punched and scattered, and the unit area mass is 60g/m 2 Is prepared from 20wt% of tencel ultrashort fibers (length of 10 mm) and 80wt% of wood pulp fibers through wet-laid and spun-laced reinforcement. The material appearance is plain weave pattern.
Test case test purpose: the materials of example 2, comparative example 1 and comparative example 2 were tested for unit area mass, thickness, liquid absorption, wet break strength, flushability index, respectively, and comparative analysis was performed.
The testing method comprises the following steps:
(1) Mass per unit area: according to GB/T24218.1 standard test of the textile nonwoven fabric test method part 1: determination of mass per unit area;
(2) Dry thickness: according to GB/T24218.2 Standard test of the method 2 part 2 of the test method for textile nonwoven fabrics;
(3) Liquid absorption amount: according to GB/T24218.6 part 6 of the test method for textile nonwoven fabrics: measurement of absorbency, standard test;
(4) Breaking strength: according to GBT/24218.3, method for testing textile nonwoven fabrics, part 3: determination of breaking Strength and elongation at break (bar sample method) Standard test;
(5) Flushability: according to GB/T40181-2021, the test is carried out in chapter 7 "shaking box decomposition test" in the test method and evaluation of the flushability of nonwoven Material for Disposable hygiene.
The test results are shown in Table 1.
TABLE 1
Analysis of test results:
(1) Dry thickness:
as can be seen from the above table, the mass per unit area (60 g/m 2 ) Since the "fiber aggregates" protruding "from the surface of the material were provided in example 2, the dry thickness of the material of example 2 was increased by 39.7% compared to the product of comparative example 1 and by 14.7% compared to the product of comparative example 2.
(2) Fiber density:
as can be seen from the above table, the mass per unit area (60 g/m 2 ) Since the dry thickness of example 2 is higher than that of comparative examples 1 and 2, the fiber density of example 2 is reduced by 27.1% compared to comparative example 1 and by 11.3% compared to comparative example 2.
In example 5, the projected area of the single "fiber aggregate" was too large (25 mm 2 ) Thus, the average fiber density of the material was reduced by 59.5% compared to example 2.
(3) Liquid absorption amount:
as can be seen from the above table, the mass per unit area (60 g/m 2 ) In the case of (a), the dry thickness of the material of example 2 was increased and the fiber density was decreased, so that the space for storing the liquid in the material was increased, and therefore, the liquid absorption amount of example 2 was increased by 2.8% and 8% as compared with comparative examples 1 and 2, respectively.
(4) Breaking strength:
as can be seen from the above table, the mass per unit area (60 g/m 2 ) In the case of (2), the wet breaking strength was higher than in both comparative examples 1 and 2. Wherein, in wet longitudinal breaking strength, example 2 was increased by 41.86% and 24.48% respectively compared to comparative example 1 and comparative example 2, and example 4 was decreased by 30.33% compared to example 2. In wet transverse rupture strength, example 2 was improved by 73.46% and 39.34% compared to comparative examples 1 and 2, respectively, while example 4 was reduced by 51.76% compared to example 2. The data fully show that the invention can greatly improve the breaking strength (especially wet breaking strength) of the broken fiber material compared with the prior art due to the special structural design of the product, and the characteristics have heavy popularization and application of the broken productMeaning.
In example 5, the projected area of the single "fiber aggregate" was too large (25 mm 2 ) The fiber distribution is uneven, so that the wet breaking strength of the material is greatly reduced compared with that of the embodiment 2. Wherein, the wet state longitudinal breaking strength of the material is reduced by 75.4 percent, and the wet state transverse breaking strength is reduced by 43.5 percent.
(5) Force ratio in the longitudinal and transverse directions:
as can be seen from the above table, the mass per unit area (60 g/m 2 ) In the case of (2), the aspect ratio was the smallest, and was 18.2% and 10.6% lower than those of comparative examples 1 and 2, respectively. However, in example 4, since the minimum projected area of the individual fiber aggregate 2 is too small, the wet longitudinal and transverse strength is too large, and the tear resistance of the material is lowered, so that breakage is likely to occur during use. The isotropy of the material is improved and the tearing property of the material is improved by reducing the strength ratio in the longitudinal and transverse directions, so that the problems of material damage and the like in the use of the conventional flushable wet tissues can be effectively solved.
(6) Flushability:
as can be seen from the table, the four products of the example 1, the example 4, the comparative example 1 and the comparative example 2 all meet the specified requirements in the "shaking box decomposition test" in chapter 7 in GB/T40181-2021 "test method for flushability of Disposable sanitary nonwoven Material and evaluation".
In summary, under the condition that the flushable performance is also achieved, the breaking strength of the product (in the embodiment 2) is greatly improved compared with that of the product (in the comparative examples 1 and 2), so that the technical scheme of the invention well solves the problem of contradiction between the flushable performance and the breaking strength index in the prior art, and has important significance for improving the quality of flushable materials.
The raw materials and equipment used in the invention are common raw materials and equipment in the field unless specified otherwise; the methods used in the present invention are conventional in the art unless otherwise specified.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any simple modification, variation and equivalent transformation of the above embodiment according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (10)
1. A reinforced flushable fibrous material, characterized by comprising a fibrous collecting zone (1) of randomly arranged fibers and intertwined with each other; a plurality of fiber aggregation bodies (2) are arranged in the fiber aggregation zone (1); the fiber stacking density in the fiber aggregation body (2) is greater than the average fiber stacking density in the fiber aggregation area (1); the thickness of the fiber aggregation body (2) is larger than that of the non-fiber aggregation body in the fiber aggregation zone (1).
2. A flushable fibrous material according to claim 1, characterized in that the minimum projected area of the individual fiber aggregate (2) is 0.7-20 mm 2 。
3. A flushable fibrous material according to claim 1 or 2, characterized in that the sum of the projected areas of all the fibre aggregation bodies (2) on the surface of the flushable fibrous material is 30-60% of the projected area of the fibre aggregation zone (1) on the surface of the flushable fibrous material.
4. A flushable fibrous material according to claim 1 or 2, characterized in that the projection of all or part of the fibre aggregation (2) onto the surface of the flushable fibrous material is polygonal.
5. The flushable fibrous material according to claim 1, wherein a number of fibre finishing zones (3) are further provided in the fibre collecting zone (1); the fiber stacking density in the fiber leveling area (3) is smaller than the fiber stacking density in the fiber aggregation body (2) and is larger than the fiber stacking density at the non-fiber aggregation body in the fiber aggregation area (1); the thickness of the fiber leveling zone (3) is smaller than the thickness of the fiber aggregation body (2) and larger than the thickness of the non-fiber aggregation body in the fiber aggregation zone (1).
6. A flushable fibrous material according to claim 5, wherein each of the fibre finishing zones (3) is surrounded by a number of fibre aggregates (2).
7. A flushable fibrous material according to claim 5 or 6, characterized in that the projected area of the individual fibre finishing zones (3) on the surface of the flushable fibrous material is larger than the projected area of the individual fibre aggregation bodies (2) on the surface of the flushable fibrous material.
8. The flushable fibrous material of claim 1 or 5, wherein the flushable fibrous material has an average fiber packing density in the dry state of from 0.08 to 0.11g/cm 3 。
9. The flushable fibrous material of claim 1 or claim 5, wherein the flushable fibrous material has a dry machine direction to transverse direction breaking strength ratio of (1.4 to 2.5) to 1 and a wet machine direction breaking strength ratio of (1.1 to 1.8) to 1.
10. A method of preparing a flushable fibrous material according to any one of claims 1 to 9, comprising the steps of:
(1) Forming the fibers into a web;
(2) Feeding the fiber web into a reinforcing mechanism for preliminary consolidation;
(3) And (3) feeding the fiber web after preliminary consolidation into a gathering mechanism, placing the fiber web on a fiber gathering template, and impacting the fiber web by adopting mechanical force to enable part of fibers in the fiber web to move and gather to form a fiber gathering body.
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