WO2015013991A1

WO2015013991A1 - Dispersible and fully-degradable spunlace nonwoven fabric, method for manufacture thereof and production line therefor

Info

Publication number: WO2015013991A1
Application number: PCT/CN2013/081121
Authority: WO
Inventors: 龚金瑞
Original assignee: 杭州诺邦无纺股份有限公司
Priority date: 2013-08-01
Filing date: 2013-08-08
Publication date: 2015-02-05
Also published as: US20160222560A1; CN103397474A; CN103397474B

Abstract

The present invention relates to a dispersible and fully-degradable spunlace nonwoven fabric being able to be quickly dispersed and fully degraded, a method for manufacture thereof and a production line therefor. The dispersible and fully-degradable spunlace nonwoven fabric is composed of 35-50% of zigzag flat viscose and 65-50% of wood pulp. Advantages: first, the dispersibility is good; second, the viscose of the dispersed nonwoven fabric is fully degraded, so that secondary pollution to the environment is avoided; and third, raw materials are pretreated, so that the characteristics of the materials themselves are greatly released, and therefore the forming strength of the nonwoven fabric under the dry state and the wet state is good.

Description

Fully degradable spunlace nonwoven fabric, production method and production line

Technical Field

The invention relates to a flushable and fully degradable spunlace non-woven fabric which can be quickly dissipated and fully degraded, and a production method and a production line thereof, and belongs to the field of manufacturing of a non-degradable non-woven fabric.

Background Art

US 2013004552 A1, entitled 'Water-Dispersible Nonwoven Fabric Material', this application provides a multi-layered nonwoven material comprising two outer layers of continuous filaments of water-soluble or water-dispersible polymer having an internal absorbent layer. The continuous filament composition of the nonwoven fabric material has a water content of less than about 10% by weight and is characterized by further comprising a dry material selected from the group consisting of household or personal care products, themed medical Substance and / Or microcapsules of one or more such substances, wherein the water-absorbing material comprises cellulose pulp fibers, characterized in that the nonwoven fabric material is impregnated with a hydrophobic substance, It is a derivative of a fatty acid in a solution of a non-aqueous organic solvent. It comprises an upper layer of a nonwoven layer of an inner layer of cellulose pulp fibers, said water soluble or water dispersible polymer and a lower layer of continuous filaments, said continuous filament being a water soluble Or a water-dispersible polymer. The length of the cellulose pulp fiber varies from less than about 2.5 Millimeter. The non-woven fabric material of the water-soluble or water-dispersible polymer is selected from the group consisting of polyvinyl alcohol (PVA), carboxymethyl cellulose, guar gum, alginate, starch, water dispersion. Sex copolyesters and mixtures thereof.

The continuous filaments have a nonwoven material having a diameter between 0.5 dtex and 6.7 dtex.

It is used in the manufacture of a nonwoven fabric material comprising the steps of: a) spunbonding filaments made of a first layer of a water-soluble or water-dispersible polymer; b) placing, on the layer of step a), a layer of water absorbing fibers, c) another layer of said spunbond filaments; d) a bonded monolayer and/or multilayer material, in a dry state, providing one or more joining processes, characterized in that said The one or more bonding steps are carried out in such a manner that the nonwoven fabric material thus obtained has a water content of less than about 10% by weight; e) the step d) of the impregnated nonwoven material is selected from the group consisting of: Household products, dry materials for personal care, medical applications for dry matter, and sustained release microcapsules of one or more of such substances; f) impregnation of solutions of fatty acid derivatives in non-aqueous organic solvents Non-woven material. It comprises one or more joining steps of one or more steps of the combined or continuous filaments and/or a single layer of pre-consolidation of the multilayer material. The production line of the spunbond filaments and the formation of the nonwoven fabric material, or in a separate production line, the single layer and / or multilayer nonwoven fabric material, combined or pre-consolidated is passed The layered material was passed through two roll compactors and embossed. The multiple layers of the bonded individual layers and/or steps comprise a dry laid process. The bonded individual layers and/or multilayer materials of the steps include methods of chemical bonding processes. The step of bonding the single layer and/or multilayer material comprises a method of a needling process. Included in a single layer and/or a nonwoven fabric material added in one or more steps, the one or more joining processes, selected from one or more of the following group: household items personal care products , themed medical preparations, superabsorbent fibers, superabsorbent polymer powders and additional substances.

Technical Problem

The shortcomings are: one is multi-layer non-woven fabric, which is not good for flushing; the other is material composition, which can not achieve full degradation, resulting in secondary pollution to the environment; third, because the raw materials are not pretreated, the material itself The characteristics are not released, so that the necessary dry and wet non-woven fabrics are weak in strength.

Technical Solution

Design purpose: to avoid the deficiencies in the background art, to design a flushable and fully degradable spunlace non-woven fabric which can quickly disperse the non-woven fabric and degrade all the non-woven fabrics and the manufacturing method thereof And equipment.

Design plan: In order to achieve the above design goals. 1. The design of the pretreatment of the serrated flat viscose fiber is one of the technical features of the present invention. The purpose of this is to: the technical indicators to be achieved by the flushable and fully degradable spunlace nonwoven fabric of the present application are: water flushing property ----- Sealed tubular rocking test 50 times dispersed into a complete fiber, weighing 30-100gsm, wet strength MD: 400G / IN. Above CD: 200G/IN. Above, that is, to achieve the ability to disperse water, but also to have the necessary strength under dry and wet conditions, so that the processing of raw materials can ensure that two contradictory technical indicators can be realized together. In this application, the serrated flat 5-20MM viscose fiber is laid flat on the feeding port, fed into the cutting machine by the conveying mechanism, and passed through the high-speed shearing action of the file in the chopper to smash on the surface or side of the fiber. Cut into a plurality of incision states to increase the surface area of the fiber, so that the cohesive force of the subsequently produced product is strengthened, so that the present application achieves the ability to meet the rapid realization of water flushing and the strength in the dry and wet state. demand. 2, the application of non-woven fabrics using 35- The design of 50% serrated flat viscose fiber and 65-50% wood pulp is the second technical feature of the present invention. The purpose of this is that since both the serrated flat viscose fiber and the wood pulp fiber of the present application are pretreated, the surface or side surface of the pretreated fiber is chopped into a plurality of slit state structures, and the slit-like structure is In the process of spunlace treatment, it is very easy to realize the intertwining between the fiber and the slit, which not only greatly improves the strength of the continuously formed sheet-like non-woven fabric, but also facilitates rapid dispersal under the action of water rushing. 3. The non-woven fabric of the present application does not require an adhesive, and the design of the all-natural degradable material is the third technical feature of the present invention. The purpose of this is that since the raw materials required for the nonwoven fabric of the present application are pretreated, the result of the pretreatment greatly increases the intertwined structure and the entangled surface between the fibers, so that no bonding is required. Under the premise of the material, the flushable and fully degradable spunlace non-woven fabric prepared by the present application can satisfy the strong demand for non-woven fabric in the dry and wet state under the premise of realizing rapid water flushing. . 4. The design of the method for producing a fully degradable spunlace nonwoven fabric which is indispensable for the present invention is a technical feature of the present invention. The purpose of this is to: because the non-woven fabric of the present application does not need the adhesive, it must satisfy the strength required for the non-woven fabric in the dry and wet state, and realize the rapid flushing of the non-woven fabric. At the same time, it is ensured that the non-woven fibers after the dispersion are fully degraded; and the five steps listed in the method for preparing the non-woven fabric of the present application are precisely to ensure that the fully degradable spunlace nonwoven fabric can achieve the above purpose. The lesser method, the five steps step by step, the step by step, the irreplaceable, is an inseparable complete technical solution. 5. The design of the device capable of dissipating the fully degradable spunlace nonwoven fabric is the fifth feature of the present invention. The purpose of this is to form a production line that can scatter the fully degradable spunlace nonwoven fabric of the present application, although the existing equipment exists, but the existing equipment is used to realize the production of the fully degradable spunlace non-woven fabric production line of the present application. Specifically designed for the purpose of designing, it is an indispensable device configuration that organically forms the functions in the existing device and the device of the present application according to the design purpose of the present application. 6. The design that the four corners of the clamping net are supported by the guide shaft to form a parallelogram structure is the sixth feature of the present invention. The purpose of this is to clamp the mesh sleeve around the periphery of the microneedle spunlace head, and to form a sandwich between the fiber mesh shape and the non-woven fabric net, and to ensure that the fiber does not produce a large amount under the action of the microneedle spunlace. Displacement creates a problem of uniformity and effectively reduces fiber loss. 7. The design of the microneedle spunlace water outlet diameter is 0.08 mm, which is the technical feature of the present invention. The purpose of this is to use micro-needle spunlace to promote the intertwining of the fibers, and to fully utilize the frictional force of the micro-incision on the viscose fiber surface after the chopping process, so that the cohesive force of the product plays a dual role. The product has been reinforced to ensure that the product is excellent in wet strength without the need to add any chemical binder or heat-soluble fibers.

Technical Solution 1: A flushable fully degradable spunlace nonwoven fabric comprising 35-50% serrated flat viscose fiber and 65-50% wood pulp.

Technical Solution 2: A method for preparing a flushable fully degradable spunlace nonwoven fabric, (1) 35-50% serrated flat 5-20 mm viscose fiber is spread on a feeding port and fed by a conveying mechanism. The cutting machine obtains the deformed viscose fiber after being cut into a plurality of slit states on the surface or side of the fiber by the high-speed shearing action of the file; (2) the deformed viscose fiber and the wood pulp are respectively sent into the condensation cotton through the feed port. After the condenser removes the air from the raw material conveying process, the rotating condenser freely falls the material to the mixer; (3) the mixer consists of three sets of equalizing rolls, and the intermediate isolation is divided into three sections. The material falling into the mixer under the action of the mixer forms a mixture of viscose fiber and wood pulp, and the water inlet installed at the upper end of the mixer injects water to make it located in the mixer. The material forms a working slurry which is sufficiently uniform; (4) a sufficiently uniform working slurry flows into the forming port, and the non-woven fabric forming net cooperates with the negative pressure generated by the suction box, the water is pumped away, and the fiber raw material remains in the support Net, thereby producing a formed sheet-like structure; (5) the web is driven by the net Into the microneedle spunlace area, through the microneedle spunlace head water needle, the fibers are intertwined and continuously form a sheet-like non-woven fabric.

Technical Solution 3: A production line capable of flushing and fully degrading spunlace nonwoven fabric, the end of the conveying mechanism is directly opposite to the feeding port of the cutting machine, the discharge port of the cutting machine is straight to the inlet of the condenser, and the cotton is sealed. The discharge port of the mixer is directly connected to the mixer inlet, and the outlet of the mixer is directly connected to the non-woven fabric forming tray, and the plurality of microneedle spunlace heads distributed on the non-woven forming tray are placed between the non-woven fabric forming tray and the non-woven fabric forming tray. There is a clamping net and the clamping net is sleeved on a plurality of microneedle spunlace heads, and a plurality of dewatering boxes are distributed under the non-woven forming web.

Advantageous Effects

Compared with the background art, the invention has good flushability; the second is to realize the complete degradation of the non-woven fabric fiber after the flushing, and avoid the secondary pollution to the environment; and the third is because the raw material is pretreated, the material thereof The characteristics of the body are greatly released, so that the strength of the non-woven fabric in the dry and wet state is good; the fourth is the use of micro-needle spunlace to promote the intertwining of the fibers, and the full utilization of the chopping process The friction of the micro-incision on the surface of the viscose fiber makes the cohesion of the product strengthened under the dual action, ensuring that the product is excellent in wet strength without adding any chemical binder or heat-soluble fiber. This product.

Description of Drawings

Fig. 1 is a schematic view showing the state of the state in which the viscose fiber in the fully degradable spunlace nonwoven fabric is pretreated (cut).

Fig. 2 is a schematic view showing the state of the untreated viscose fiber (not cut).

Figure 3 is a block diagram of a method for making a flushable fully degradable spunlace nonwoven.

Figure 4 is a partial structural schematic view of a flushable fully degradable spunlace nonwoven production line.

Figure 5 is a schematic view of the structure of the clamping net.

Mode for Invention

Embodiment 1: Reference is made to Figures 1 and 2. A flushable fully degradable spunlace nonwoven fabric consisting of 35-50% serrated flat viscose fiber 9, 65-50% wood pulp. The serrated flat viscose fiber 9 is a deformed viscose fiber 10 which has been subjected to a chopping treatment. The serrated flat viscose fiber (deformed viscose fiber 10) has a length of 5-20 mm. The 35- The 50% serrated flat viscose fiber (deformed viscose fiber 10) accounts for 20-30% of the fiber length of more than 10 mm and less than or equal to 20 mm, and the fiber length of 5 mm or more and less than or equal to 10 mm. The wood pulp fibers have a length of from 1 to 5 mm. The 65-50% of the wood pulp has a fiber length of greater than or equal to 1 mm and less than or equal to 3 mm of 20-30%, a fiber length of more than 3 mm and less than or equal to 5 mm of 80-70%. The technical indicators of the flushable fully degradable spunlace nonwoven fabric are as follows:

Water flushing-----sealed tubular rocking test 50 times dispersed into complete fiber; weight: 30-100gsm; wet strength MD: 400g/in. above CD: 200g/in.

The structure of the clamping net is made of polyester yarn weft and weft, the diameter is 0.20-0.30mm polyester yarn, and the mesh of the clamping net is 50-65 mesh, ( The number of polyester filaments is 29 lines/cm).

Example 1-1: On the basis of Example 1, a flushable fully degradable spunlace nonwoven fabric consisting of 35% serrated flat viscose fiber 9, 65% wood pulp. The serrated flat viscose fiber 9 is a deformed viscose fiber 10 after being chopped (see the tangent line in Fig. 1). The 35-50% sawtooth flattened viscose fiber has a fiber length of more than 10 mm and less than or equal to 20 mm, 70-80%, and a fiber length of 5 mm or more and less than or equal to 10 Mm accounts for 20-30%. The 65-50% wood pulp has a fiber length of greater than or equal to 1 mm and less than or equal to 3 mm of 20%, a fiber length of more than 3 mm and less than or equal to 5 mm of 80%.

Example 1-2: On the basis of Example 1, a flushable fully degradable spunlace nonwoven fabric consisting of 50% serrated flat viscose fiber 9, 50% wood pulp. The serrated flat viscose fiber 9 is a deformed viscose fiber 10 which has been subjected to a chopping treatment. The 35-50% sawtooth flattened viscose fiber accounts for 20-30% of the fiber length of more than 10 mm and less than or equal to 20 mm, 70-80% of the fiber length, and greater than or equal to 5 mm and less than or equal to 10 mm. 70-50% of the wood pulp has a fiber length of greater than or equal to 1 mm and less than or equal to 3 mm of 30%, a fiber length of more than 3 mm and less than or equal to 5 mm of 70%.

Example 1-3: On the basis of Example 1, a flushable fully degradable spunlace nonwoven fabric consisting of 40% serrated flat viscose fiber 9, 60% wood pulp. The serrated flat viscose fiber 9 is a deformed viscose fiber 10 which has been subjected to a chopping treatment. The 35-50% sawtooth flattened viscose fiber accounts for 20-30% of the fiber length of more than 10 mm and less than or equal to 20 mm, 70-80% of the fiber length, and greater than or equal to 5 mm and less than or equal to 10 mm. The 65-50% wood pulp has a fiber length of greater than or equal to 1 mm and less than or equal to 3 mm of 25%, a fiber length of greater than 3 mm and less than or equal to 5 mm of 75%.

Example 2: A flushable fully degradable spunlace nonwoven fabric consisting of 35-50% serrated flat viscose fiber 9, 65-50% wood pulp. The serrated flat viscose fiber has a length of 5-20 mm.

Example 2-1: On the basis of Example 1, a flushable fully degradable spunlace nonwoven fabric consisting of 35% serrated flat viscose fiber 9, 65% wood pulp. The serrated flat viscose fiber has a length of 20 mm.

Example 2-2: A flushable fully degradable spunlace nonwoven fabric consisting of 50% serrated flat viscose fiber 9, 50% wood pulp. The serrated flat viscose fiber has a length of 5 mm.

Example 2-3: A flushable fully degradable spunlace nonwoven fabric, 40% of a 40% serrated flat viscose fiber Wood pulp composition. The serrated flat viscose fiber has a length of 10 mm.

Example 3: Refer to Figures 3-5. A method for preparing a fully degradable spunlace nonwoven fabric, (1) 35-50% serrated flat 5-20 mm viscose fiber is laid flat at a feeding port, and the conveying mechanism 8 Feeding the chopping machine 1, through the high-speed shearing action of the file, the viscous viscose fiber is obtained after the surface or side of the fiber is cut into a plurality of slits; (2) the deformed viscose fiber and the wood pulp are respectively fed by the inlet After feeding into the condenser 2, the condenser 2 removes the air from the raw material conveying process, and the rotating condenser 2 freely falls the raw material to the mixer 3; (3) the mixer 3 is composed of three groups of materials. The composition of the roller is divided into three sections in the middle, and the material falling into the mixer is formed by the mixer, and the viscose fiber and the wood pulp mixture are formed by the mixer, and the water inlet is installed at the upper end of the mixer. Water, so that the material located in the mixer forms a fully uniform working slurry; (4) a sufficiently uniform working slurry flows into the forming port, and the nonwoven fabric is formed into the tray 4 and the suction box 7 The generated negative pressure works together, the water is pumped away, the fiber raw material remains on the pallet, thereby producing the formed web structure; (5) the web is driven by the tray to the microneedle spunlace zone, and the microneedle is passed through the microneedle. The spunlace head acts as a water needle, and the fibers are entangled with each other to form a sheet-like nonwoven fabric continuously. The microneedle spunlace head has a clamping net around the clamping net, and the clamping net forms a clamping shape between the webs under the action of the microneedle spunlace to ensure that the fiber web does not have a large displacement, and the fiber is ensured. Net uniformity reduces fiber loss.

Example 5: Refer to Figure 4. A production line capable of flushing and fully degrading spunlace non-woven fabric, the end of the conveying mechanism 8 is directly connected to the feeding port of the cutting machine 1, the discharging port of the cutting machine 1 is directly connected to the inlet of the condenser 2, and the cotton is sealed. The discharge port of the device 2 is directly connected to the inlet of the mixer 3, the outlet of the mixer 3 is directly connected to the non-woven fabric forming tray 4, and the plurality of microneedle spunlace heads 5 distributed on the non-woven forming tray 4 are non-woven. A clamping net 6 is placed between the cloth forming trays 4 and the clamping net 6 is placed over the plurality of microneedle spunlace heads 5, and a plurality of dewatering tanks 7 are distributed below the nonwoven fabric forming tray 4. The three groups of the mixers 3 are equally angularly distributed, and the mixing rolls are provided with stirring teeth. The mixer 3 is provided with a spray port 12 and a water inlet 13. The four corners of the clamping net 6 are supported by a guide shaft to form a parallelogram structure. The outlet diameter of the microneedle spunlace head 5 is 0.08 mm.

It should be understood that although the above embodiment has a relatively detailed text description of the design idea of the present invention, these text descriptions are merely a simple text description of the design idea of the present invention, and are not limited to the design idea of the present invention, and may not exceed any Combinations, additions or modifications of the inventive design are all within the scope of the invention.

Claims

A flushable fully degradable spunlace nonwoven fabric characterized by 35-50% serrated flat viscose fiber (9) and 65-50% wood pulp.
The flushable fully degradable spunlace nonwoven fabric according to claim 1, wherein the serrated flat viscose fiber (9) is a deformed viscose fiber (10) after being chopped.
The flushable fully degradable hydroentangled nonwoven fabric according to claim 2, wherein the deformed viscose fiber (10) has a length of 5-20 mm.
The flushable and fully degradable spunlace nonwoven fabric according to claim 1 or 3, wherein the 35-50% zigzag flat viscose fiber has a fiber length of more than 10 mm and less than or equal to 20 mm. 80%, fiber length greater than or equal to 5mm and less than or equal to 10mm accounted for 20-30%.
The flushable fully degradable hydroentangled nonwoven fabric according to claim 1, wherein the wood pulp fibers have a length of from 1 to 5 mm.
The flushable and fully degradable spunlace nonwoven fabric according to claim 1 or 5, wherein the fiber length of the 65-50% wood pulp is greater than or equal to 1 mm and less than or equal to 3 mm. 30%, fiber length greater than 3mm and less than or equal to 5mm accounted for 80-70%.
The flushable fully degradable spunlace nonwoven fabric according to claim 1, wherein the technical indexes of the flushable fully degradable spunlace nonwoven fabric are as follows:

Water flushing ----- Sealed tubular rocking test 50 times dispersed into completely fibrous;

Weight 30-100gsm;

Wet strength MD: 400 g/in. or more CD: 200 g/in. or more.
A method for preparing a fully degradable spunlace nonwoven fabric, characterized in that:

(1) 35-50% serrated flat 5-20mm viscose fiber is laid flat on the feeding port, fed by the conveying mechanism (8) into the cutting machine (1), and the high-speed shearing action on the fiber surface Or deformed viscose fiber after side cutting into a plurality of slit states;

(2) The deformed viscose fiber and the wood pulp are respectively fed into the condenser (2) from the inlet, and the condenser (2) removes the air from the raw material conveying process, and then rotates the condenser (2) Freely dropping the raw material to the mixer (3);

(3) The mixer (3) consists of three sets of equalizing rolls, the middle part is divided into three sections, and the free fall falling into the mixer forms viscose fiber and wood pulp under the action of the mixer. Mixing material, water is injected into the water inlet of the upper end of the mixer to make the material located in the mixer form a sufficiently uniform working slurry;

(4) The fully uniform working slurry flows into the forming port, and the non-woven fabric forming tray (4) cooperates with the negative pressure generated by the suction box (7), the water is pumped away, and the fiber raw material remains in the tray, thereby generating Formed web structure;

(5) The fiber web is input by the tray to the microneedle spunlace area, and the fibers are intertwined by the microneedle spunlace head water, and the sheet-like non-woven fabric is continuously formed.
The method for manufacturing a flushable and fully degradable spunlace nonwoven fabric according to claim 8, wherein the microneedle spunlace head is sleeved with a clamping net, and the clamping net is formed between the webs and the web. The clamping shape ensures that the fiber web does not have a large displacement under the action of the microneedle spunlace, ensuring the uniformity of the fiber web and reducing the loss of the fiber.
The utility model relates to a production line capable of flushing and fully degrading spunlace non-woven fabric, which is characterized in that: the end of the conveying mechanism (8) is directly opposite to the feeding port of the cutting machine (1), and the discharge port of the cutting machine (1) is straight Condenser (2) feed port, condenser (2) discharge port straight to the mixer (3) inlet, mixer (3) outlet straight to non-woven fabric forming tray (4), distributed in A clamping net (6) is placed between the plurality of microneedle spunlace heads (5) on the non-woven forming web (4) and the non-woven forming web (4) and the clamping net (6) is placed over On the plurality of microneedle spunlace heads (5), a plurality of dewatering tanks (7) are distributed below the nonwoven fabric forming tray (4).
The production line of the flushable and fully degradable spunlace nonwoven fabric according to claim 10, wherein the three mixer rolls of the mixer (3) are equiangularly distributed, and the stirring roller is disposed on the material roller.
The production line of the flushable and fully degradable spunlace nonwoven fabric according to claim 10, wherein the four corners of the clamping net (6) are supported by the guide shaft to form a parallelogram structure.
The production line of the flushable and fully degradable spunlace nonwoven fabric according to claim 10, wherein the microneedle spunlace head (5) has a water outlet diameter of 0.08mm.