Degradable and printed composite spunlace non-woven fabric

Abstract

The utility model discloses a degradable and printed composite spunlace non-woven fabric which comprises a regenerated cellulose fiber spunlace non-woven fabric base layer, a degradable high polymer material lamination layer and a kraft paper layer, and the degradable high polymer material lamination layer is arranged between the non-woven fabric base layer and the kraft paper layer. The composite spunlace non-woven fabric is of a three-layer structure, the base layer is a full-regenerated cellulose fiber spunlace non-woven fabric and is provided with a fiber cavity structure, the cavity structure is combined with a degradable high polymer material melt, and the tightness degree of combination between the base layer and a lamination layer is increased; the middle layer is a film spraying layer made of a degradable high polymer material; the upper layer is a kraft paper layer with a smooth front surface and a rough back surface, and the rough back surface is combined with the degradable high polymer material melt, so that the tightness degree of combination between the kraft paper layer and the lamination layer is increased; and the smooth front surface is arranged on the outer side, so that a prepared packaging bag can be conveniently used for pattern printing, and the composite spunlace non-woven fabric is compact, not easy to layer, high in degradation degree and the like after being compounded.

Description

Technical Field

[0001] The utility model relates to a composite non-woven fabric, in particular to a degradable and printable composite spunlace non-woven fabric, belonging to the technical field of composite non-woven fabrics. Background Art

[0002] Composite spunlace nonwoven fabrics are made of at least two materials. Generally, in order to ensure their excellent performance, suitable materials need to be selected. Commonly selected materials include cellulose, polypropylene, polyester, etc. These materials have good mechanical properties, chemical stability and anti-aging properties, which can meet the needs of composite spunlace nonwoven fabrics. However, in order to ensure the functionality of composite spunlace nonwoven fabrics, it is easy to cause composite spunlace nonwoven fabrics to be delaminated, with a narrow scope of application and low degree of degradation.

[0003] Prior art CN104149413A provides a coated paper with bright color, various patterns, no fading, waterproof and wear-resistant and its preparation method, wherein the coated paper is based on kraft paper, low-density polyethylene is used as a bonding medium, and the aluminized film and kraft paper are pasted together. CN111169098A solves the problem that there are gaps and bubbles between kraft paper and non-woven fabric, which leads to the problem that the gaps and bubbles cannot be laminated during the laminating process, thereby reducing the quality of the composite bag; CN114953616A discloses that the composite material is composed of non-woven fabric, polyethylene and paper from the inside to the outside, and the paper is one of kraft paper, paper bag paper, chicken skin paper, parchment paper or glassine paper, and the polyethylene is evenly coated between the non-woven fabric and the paper after heating and pressurizing.

[0004] However, none of them effectively solves the problem of easy delamination and low degree of degradability of composite non-woven fabrics. Summary of the invention

[0005] The utility model provides a degradable and printable composite spunlace nonwoven fabric to solve the technical problems of the existing composite nonwoven fabrics being loose in composite, easy to delaminate, not highly degradable and not beautiful after printing.

[0006] In order to achieve the above technical objectives, the following technical solutions are proposed:

[0007] A degradable and printed composite spunlace nonwoven fabric, comprising a regenerated cellulose fiber spunlace nonwoven fabric base, a degradable polymer material coating layer and a kraft paper layer, wherein the degradable polymer material coating layer is arranged between the nonwoven fabric base and the kraft paper layer;

[0008] Regenerated cellulose fiber spunlace nonwoven fabric base layer: there is a fiber cavity formed by interlacing regenerated cellulose fibers inside, and the fiber cavity is evenly distributed in the regenerated cellulose fiber spunlace nonwoven fabric base layer;

[0009] Degradable polymer material coating layer: including coating layer body, melt I and melt II, melt I is evenly distributed on the front side of the coating layer body, and melt I extends into the kraft paper layer; melt II is evenly distributed on the back side of the coating layer body, and melt II extends into the non-woven fabric base layer, and melt II is matched with the viscose fiber cavity;

[0010] Kraft paper layer: including a kraft paper layer body, the front side of the kraft paper layer body is smooth, the back side of the kraft paper layer body is rough, and the rough side of the kraft paper layer body is matched with the melt I. For the rough side, the roughness of the back side is 1.5-1.9μm (rough), or a groove extending into the kraft paper layer body is provided on the back side, the groove is matched with the melt I, and the height of the groove is 0.01-0.03mm; for the smooth side, the roughness of the front side is 0.4-0.8μm (smooth).

[0011] Furthermore, the composite spunlace nonwoven fabric has a thickness of 0.55-1.46 mm.

[0012] Furthermore, in the regenerated cellulose fiber spunlace nonwoven fabric base layer, the regenerated cellulose fiber spunlace nonwoven fabric has a gram weight of 40-90 g / m 2 , the length of the regenerated cellulose fiber is 35-40 mm, the fiber cavity diameter is 0.82-0.84 mm; and the thickness of the regenerated cellulose fiber spunlace non-woven fabric base layer is 0.25-0.66 mm.

[0013] Furthermore, in the regenerated cellulose fiber spunlace nonwoven fabric base layer, the regenerated cellulose fiber spunlace nonwoven fabric is one of viscose fiber spunlace nonwoven fabric, lyocell fiber spunlace nonwoven fabric and bamboo fiber spunlace nonwoven fabric, or a mixture of any two of them.

[0014] Furthermore, in the degradable polymer material coating layer, after the degradable polymer material melt is cooled, the thickness of the coating layer body is 0.2-0.5 mm, the length of melt I is 0.01-0.03 mm, and the length of melt II is 0.25-0.66 mm.

[0015] Furthermore, the melt I is bonded to the groove.

[0016] Furthermore, the melt II is bonded to the fiber cavity.

[0017] Furthermore, in the degradable polymer coating layer, the degradable polymer material is one of PLA, PBAT, PCL, PHA, PBS or a mixture of any two thereof.

[0018] Furthermore, in the kraft paper layer, the kraft paper has a grammage of 60-90 g / m 2 ; The thickness of the kraft paper layer is 0.1-0.3mm.

[0019] The positional relationships such as "front", "back", "upper", "between", "middle" and "inside" involved in this technical solution are defined according to the situations under actual usage conditions. They are conventional terms in this technical field and are also conventional terms used by technical personnel in this field in actual use.

[0020] The beneficial technical effects brought about by adopting this technical solution are:

[0021] 1. In the utility model, the composite spunlace nonwoven fabric is a "three-layer structure", wherein the base layer is a fully regenerated cellulose fiber spunlace nonwoven fabric, and the base layer has a fiber cavity structure. The cavity structure is combined with the melt of the degradable polymer material to increase the tightness of the bonding between the base layer and the coating layer. The middle layer uses a degradable polymer material as the coating layer (also an adhesive layer). The upper layer is a kraft paper layer with a smooth front side and a rough back side. The rough back side is combined with the melt of the degradable polymer material to increase the tightness of the bonding between the kraft paper layer and the coating layer; the smooth front side is on the outside, which is convenient for the prepared packaging bag to be used for pattern printing, thereby ensuring that the composite spunlace nonwoven fabric is compact after compounding, not easy to delaminate, highly degradable, and convenient for printing;

[0022] 2. In the present invention, the composite spunlace nonwoven fabric has the characteristics of high strength, high stiffness, degradability and environmental friendliness. Among them, since the regenerated cellulose fiber spunlace nonwoven fabric base layer, the kraft paper layer and the degradable polymer melt have good compatibility and are tightly combined to form a complete structure, the three are strongly superimposed and play a synergistic role, so the composite spunlace nonwoven fabric formed has high strength;

[0023] The biodegradable polymer material used is a semi-crystalline polymer melt. After the melt is cooled, its hardness is higher than that of the PE / PP coating material. At the same time, the composite spunlace non-woven fabric of the composite fabric can be regulated by further adjusting the thickness / gram weight of the coating layer of the biodegradable polymer material.

[0024] Composite spunlace nonwoven fabrics are made of regenerated cellulose fibers, degradable polymer materials, and kraft paper, all of which are degradable materials. The composite spunlace nonwoven fabrics are completely degradable. In addition, cellulose fibers can be completely degraded under natural conditions, without pollution to nature; the degradation cycle of the degradable polymer materials used is much shorter than that of petrochemical plastic products, and it is the current mainstream development direction of degradable materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the utility model;

[0026] Figure 2 It is a cross-sectional view of the utility model;

[0027] Figure 3This is an electron microscope scanning image of the regenerated cellulose fiber spunlace nonwoven fabric base layer in the utility model (magnified 5000 times);

[0028] Figure 4 This is an electron microscope scan of the front side of the utility model (that is, an electron microscope scan of the smooth side of the kraft paper layer, magnified 500 times);

[0029] Figure 5 A front view of the utility model (i.e., a view of the smooth surface of the kraft paper layer);

[0030] Figure 6 This is a reverse electron microscope scan of the utility model;

[0031] Figure 7 This is a real picture of the reverse side of the utility model;

[0032] In the figure, 1. regenerated cellulose fiber spunlace nonwoven fabric base layer, 11. regenerated cellulose fiber, 12. fiber cavity, 2. degradable polymer material coating layer, 21. coating layer body, 22. melt I, 23. melt II, 3. kraft paper layer, 31. kraft paper layer body, 4. groove. DETAILED DESCRIPTION

[0033] The following is a clear and complete description of the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] Example 1

[0035] This embodiment provides: a degradable and printable composite spunlace nonwoven fabric, such as Figure 2 As shown, it includes a regenerated cellulose fiber spunlace nonwoven fabric base layer 1, a degradable polymer material coating layer 2 and a kraft paper layer 3, wherein the degradable polymer material coating layer 2 is arranged between the nonwoven fabric base layer and the kraft paper layer 3;

[0036] Regenerated cellulose fiber spunlace nonwoven fabric base 1: Figure 3 As shown, there is a fiber cavity 12 formed by interlacing regenerated cellulose fibers 11 inside, and the fiber cavity 12 is evenly distributed in the regenerated cellulose fiber spunlace nonwoven fabric base layer 1;

[0037] The degradable polymer material coating layer 2 includes a coating layer body 21, a melt I 22 and a melt II 23. The melt I 22 is evenly distributed on the front surface of the coating layer body 21, and the melt I 22 extends into the kraft paper layer 3. The melt II 23 is evenly distributed on the back surface of the coating layer body 21, and the melt II 23 extends into the non-woven fabric base layer. The melt II 23 is matched with the viscose fiber cavity 12.

[0038] Kraft paper layer 3: includes a kraft paper layer 3 body, the front side of the kraft paper layer 3 body is smooth, the back side of the kraft paper layer 3 body is rough, and the rough side of the kraft paper layer 3 body is matched with the melt I 22 .

[0039] The composite spunlace nonwoven fabric is a "three-layer structure" (such as Figure 1 As shown, the base layer is a spunlace nonwoven fabric of all-regenerated cellulose fiber 11, and the base layer has a fiber cavity 12 structure. The cavity structure is combined with the melt of the degradable polymer material to increase the tightness of the combination between the base layer and the coating layer. The middle layer uses a degradable polymer material as a coating layer (also an adhesive layer). The upper layer is a kraft paper layer 3 with a smooth front side and a rough back side. The rough back side is combined with the melt of the degradable polymer material to increase the tightness of the combination between the kraft paper layer 3 and the coating layer; the smooth front side is on the outside, which is convenient for the prepared packaging bag to be used for pattern printing, thereby ensuring that the composite spunlace nonwoven fabric is compact after compounding, not easy to delaminate, highly degradable, and convenient for printing.

[0040] Among them, the processing mechanisms involved include:

[0041] When the degradable polymer material is heated to a molten state, during the composite process, the melt II23 formed penetrates into the cavity of the spunlace non-woven fabric, bonding the regenerated cellulose fibers 11 in the non-woven fabric together; at the same time, the melt I22 formed bonds to the rough surface of the kraft paper, and after the melt cools, the upper layer of the kraft paper and the spunlace fabric base are tightly bonded together through the polymer coating layer, forming a tightly structured, non-stratified composite whole. Furthermore, the softness of the composite spunlace non-woven fabric can be controlled by controlling the gram weight of the polymer coating layer. When the gram weight of the polymer coating layer is low, the composite spunlace non-woven fabric formed is softer; when the gram weight of the polymer coating layer is high, the composite spunlace non-woven fabric formed has high stiffness, that is, according to actual needs, finally, a non-woven fabric suitable for various packaging scenarios (such as Figure 4-7 as shown).

[0042] Example 2

[0043] On the basis of Example 1, this example further limits the thickness of the composite spunlace non-woven fabric to further illustrate the technical solution.

[0044] The thickness of the composite spunlace non-woven fabric is 0.55-1.46mm. The limitation of this thickness ensures the basic performance of the composite product (tight composite, no stratification, appropriate hardness and softness) while facilitating subsequent applications, such as processing into packaging bags.

[0045] Example 3

[0046] On the basis of Examples 1-2, this example further defines the regenerated cellulose fiber spunlace nonwoven fabric base layer 1 to further illustrate the technical solution.

[0047] Among them, in the regenerated cellulose fiber spunlace nonwoven base layer 1, the regenerated cellulose fiber 11 spunlace nonwoven has a gram weight of 40-90 g / m 2 , the length of the regenerated cellulose fiber 11 is 35-40 mm, the diameter of the fiber cavity 12 is 0.82-0.84 mm; and the thickness of the regenerated cellulose fiber spunlace nonwoven fabric base layer 1 is 0.25-0.66 mm.

[0048] Furthermore, in the regenerated cellulose fiber spunlace nonwoven fabric base layer 1, the regenerated cellulose fiber 11 spunlace nonwoven fabric is one of viscose fiber spunlace nonwoven fabric, lyocell fiber spunlace nonwoven fabric and bamboo fiber spunlace nonwoven fabric, or a mixture of any two of them.

[0049] Example 4

[0050] On the basis of Examples 1-3, this example further defines the degradable polymer material coating layer 2 to further illustrate the technical solution.

[0051] Among them, in the degradable polymer material coating layer 2, after the degradable polymer material melt is cooled, the thickness of the coating layer body 21 is 0.2-0.5mm, the length of the melt I 22 is 0.01-0.03mm, and the length of the melt II 23 is 0.25-0.66mm.

[0052] The melt II 23 is bonded to the fiber cavity 12 .

[0053] Furthermore, in the degradable polymer coating layer 2, the degradable polymer material is one of PLA, PBAT, PCL, PHA, and PBS, or a mixture of any two thereof.

[0054] Example 5

[0055] On the basis of Examples 1-4, this example further defines the kraft paper layer 3 to further illustrate the technical solution.

[0056] Among them, the weight of kraft paper layer 3 is 60-90g / m 2 , thickness is 0.1-0.3mm.

[0057] The main body of the kraft paper layer 3 is a main body of the kraft paper layer 3 with a front surface roughness of 0.4-0.8 μm and a back surface roughness of 1.5-1.9 μm.

[0058] Alternatively, a groove 4 extending into the body of the kraft paper layer 3 is provided on the reverse side of the body of the kraft paper layer 3, and the groove 4 is matched with the melt I 22; the height of the groove 4 is 0.01-0.03 mm, and the melt I 22 and the groove 4 are bonded.

Claims

1. A degradable and printable composite spunlace nonwoven fabric, characterized in that: It comprises a regenerated cellulose fiber spunlace non-woven fabric base layer (1), a degradable polymer material coating layer (2) and a kraft paper layer (3), wherein the degradable polymer material coating layer (2) is arranged between the non-woven fabric base layer and the kraft paper layer (3); The regenerated cellulose fiber spunlace nonwoven fabric base layer (1) is provided with fiber cavities (12) formed by interlacing regenerated cellulose fibers (11), and the fiber cavities (12) are evenly distributed in the regenerated cellulose fiber spunlace nonwoven fabric base layer (1); The degradable polymer material coating layer (2) comprises a coating layer body (21), melt I (22) and melt II (23), wherein melt I (22) is evenly distributed on the front surface of the coating layer body (21), and melt I (22) extends into the kraft paper layer (3); The melt II (23) is evenly distributed on the reverse side of the coating layer body (21), the melt II (23) extends into the non-woven fabric base layer, and the melt II (23) and the viscose fiber cavity (12) are matched. The kraft paper layer (3) comprises a kraft paper layer (3) body, the front side of the kraft paper layer (3) body is smooth, the back side of the kraft paper layer (3) body is rough, and the rough side of the kraft paper layer (3) body is matched with the melt I (22).

2. The degradable and printed composite spunlace nonwoven fabric according to claim 1, characterized in that: The composite spunlace nonwoven fabric has a thickness of 0.55-1.46 mm.

3. The degradable and printed composite spunlace nonwoven fabric according to claim 1, characterized in that: In the regenerated cellulose fiber spunlace nonwoven fabric base layer (1), the spunlace nonwoven fabric of the regenerated cellulose fiber (11) has a gram weight of 40-90 g / m 2 , the length of the regenerated cellulose fiber (11) is 35-40 mm, the diameter of the fiber cavity (12) is 0.82-0.84 mm; and the thickness of the regenerated cellulose fiber spunlace nonwoven fabric base layer (1) is 0.25-0.66 mm.

4. The degradable and printed composite spunlace nonwoven fabric according to claim 1 or 3, characterized in that: In the regenerated cellulose fiber spunlace nonwoven fabric base layer (1), the regenerated cellulose fiber (11) spunlace nonwoven fabric is a regenerated cellulose fiber spunlace nonwoven fabric selected from the group consisting of viscose fiber spunlace nonwoven fabric, lyocell fiber spunlace nonwoven fabric and bamboo fiber spunlace nonwoven fabric.

5. The degradable and printed composite spunlace nonwoven fabric according to claim 1, characterized in that: In the degradable polymer material coating layer (2), after the degradable polymer material melt is cooled, the coating layer body (21) has a thickness of 0.2-0.5 mm, the melt I (22) has a length of 0.01-0.03 mm, and the melt II (23) has a length of 0.25-0.66 mm.

6. The degradable and printed composite spunlace nonwoven fabric according to claim 1, characterized in that: The melt II (23) is bonded to the fiber cavity (12).

7. The degradable and printed composite spunlace nonwoven fabric according to claim 1, 5 or 6, characterized in that: In the degradable polymer material coating layer (2), the degradable polymer material is a degradable polymer material selected from the group consisting of PLA, PBAT, PCL, PHA and PBS.

8. The degradable and printed composite spunlace nonwoven fabric according to claim 1, characterized in that: In the kraft paper layer (3), the kraft paper has a grammage of 60-90 g / m 2 ; The thickness of the kraft paper layer (3) is 0.1-0.3 mm.

9. The degradable and printed composite spunlace nonwoven fabric according to claim 1 or 8, characterized in that: The kraft paper layer (3) body has a front surface roughness of 0.4-0.8 μm and a back surface roughness of 1.5-1.9 μm.

10. The degradable and printed composite spunlace nonwoven fabric according to claim 1, characterized in that: A groove (4) extending into the body of the kraft paper layer (3) is provided on the reverse side of the body of the kraft paper layer (3), and the groove (4) is matched with the melt I (22); the height of the groove (4) is 0.01-0.03 mm, and the melt I (22) and the groove (4) are bonded.

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