Degradable non-woven fabric and preparation method and application thereof

Abstract

The invention discloses a degradable non-woven fabric and a preparation method and application thereof. The degradable non-woven fabric comprises a porous protective layer and a porous exchange layer which are laminated and compounded, the porous protective layer comprises nanocellulose fibers, regenerated cellulose fibers, binding fibers and a binder, and the porous exchange layer comprises nanocellulose fibers, regenerated cellulose fibers and a binder. The preparation method of the degradable non-woven fabric comprises the following steps: carrying out primary papermaking forming and compounding by adopting a multi-runner inclined-wire paper machine, or respectively carrying out papermaking forming on the porous protective layer and the porous exchange layer by adopting a single-runner inclined-wire paper machine, and then carrying out hot-pressing compounding. The degradable non-woven fabric has the advantages of being high in porosity, controllable in hole, good in tensile property, good in tear resistance, good in permeability, environmentally friendly, degradable and the like, can be used for manufacturing lip cigarette packages, and is wide in raw material source, simple in preparation method, low in production cost and suitable for large-scale industrial production and application.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging materials, and particularly relates to a degradable non-woven fabric and its preparation method and application. Background Art

[0002] Chew tobacco, also known as oral tobacco or snuff, is a smokeless tobacco product made from ground tobacco, sweeteners, and other additives. Chew tobacco does not need to be inhaled by burning, so it does not produce second-hand smoke, and it causes relatively less harm to consumers' health compared with traditional cigarettes, thus being favored by consumers. Currently, most of the chew tobacco on the market is made by wrapping tobacco materials with non-woven fabric packaging bags. During the use of chew tobacco by consumers, the tobacco bag needs to be placed between the gums and the lips, and rely on the saliva secreted by the oral cavity to dissolve chemical components such as nicotine in the product, and then absorbed through the oral mucosa. However, traditional non-woven fabrics are usually made of synthetic fibers such as polyethylene fibers, polypropylene fibers, aramid fibers, and polyester fibers, which are difficult to degrade in the natural environment, will pollute the soil, water sources, and organisms, and will ultimately affect the ecological balance. In addition, the pore sizes of traditional non-woven fabric packaging materials are uneven, and the porosity is not uniform, which will cause the diffusion rate of nicotine to be uneven, thus resulting in a serious decline in the experience of consumers. In summary, the existing non-woven fabric packaging materials have obvious defects and simply cannot fully meet the actual application requirements in the field of chew tobacco.

[0003] Therefore, it is of great significance to develop a non-woven fabric with high porosity, controllable pores, and environmental protection and degradability. Summary of the Invention

[0004] The purpose of the present invention is to provide a degradable non-woven fabric and its preparation method and application.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A degradable non-woven fabric, which comprises a porous protective layer and a porous exchange layer laminated and compounded; the porous protective layer comprises nanofibrillated cellulose fibers, regenerated cellulose fibers, binder fibers, and a binder; the porous exchange layer comprises nanofibrillated cellulose fibers, regenerated cellulose fibers, and a binder.

[0007] Preferably, the mass ratio of nanofibrillated cellulose fibers, regenerated cellulose fibers, and binder fibers in the porous protective layer is 1:0.7 - 0.8:0.7 - 0.8.

[0008] Preferably, the weight of the binder in the porous protective layer accounts for 8% - 15% of the total weight of nanofibrillated cellulose fibers, regenerated cellulose fibers, and binder fibers.

[0009] Preferably, the mass ratio of nanofibrillated cellulose fibers to regenerated cellulose fibers in the porous exchange layer is 1:1.5 to 2.5.

[0010] Preferably, the weight of the binder in the porous exchange layer accounts for 5% to 10% of the total weight of nanofibrillated cellulose fibers and regenerated cellulose fibers.

[0011] Preferably, the length of the nanofibrillated cellulose fibers is 3 μm to 10 μm, and the diameter is 50 nm to 500 nm.

[0012] Preferably, the length of the regenerated cellulose fibers is 2 μm to 10 μm, and the diameter is 100 nm to 500 nm.

[0013] Preferably, the binder fibers are compounded from fibers with the following mass percentages:

[0014] Water-soluble polyvinyl alcohol fibers: 20% to 40%;

[0015] Bicomponent polyester fibers: 40% to 60%;

[0016] Bicomponent polypropylene fibers: 20% to 30%.

[0017] Preferably, the length of the water-soluble polyvinyl alcohol fibers is 3 mm to 6 mm, and the diameter is 10 μm to 20 μm.

[0018] Preferably, the composition of the bicomponent polyester fibers includes polyester with a melting point of 110°C to 130°C and polyester with a melting point of 240°C to 260°C.

[0019] Preferably, the mass ratio of the polyester with a melting point of 110°C to 130°C to the polyester with a melting point of 240°C to 260°C in the bicomponent polyester fibers is 1:1.8 to 2.2.

[0020] Preferably, the length of the bicomponent polyester fibers is 3 mm to 6 mm, the diameter is 15 μm to 25 μm, and the linear density is 0.1 dtex to 0.3 dtex.

[0021] Preferably, the bicomponent polypropylene fibers include a core layer and an outer layer. The composition of the core layer includes polypropylene with a melting point of 160°C to 170°C, and the composition of the outer layer includes polypropylene with a melting point of 130°C to 140°C.

[0022] Preferably, the mass ratio of the polypropylene with a melting point of 130°C to 140°C to the polypropylene with a melting point of 160°C to 170°C in the bicomponent polypropylene fibers is 1:1.8 to 2.2.

[0023] Preferably, the length of the bicomponent polypropylene fibers is 3 mm to 6 mm, and the diameter is 15 μm to 25 μm.

[0024] Preferably, the binder is at least one of food-grade acrylic acid and starch.

[0025] Preferably, the grammage of the porous protective layer is 5 gsm to 8 gsm, the thickness is 10 μm to 20 μm, the pore diameter of the holes is 5 μm to 30 μm, and the porosity is 70% to 90%.

[0026] Preferably, the grammage of the porous exchange layer is 10 gsm to 20 gsm, the thickness is 20 μm to 30 μm, and the pore diameter of the holes is 20 μm to 50 μm.

[0027] A method for preparing the biodegradable non-woven fabric as described above includes the following steps:

[0028] 1) Separately add the constituent materials of the porous protective layer and the constituent materials of the porous exchange layer to water and disperse them into slurries;

[0029] 2) Use a multi-channel inclined wire paper machine to simultaneously form and composite the porous protective layer and the porous exchange layer by papermaking, and then the biodegradable non-woven fabric is obtained;

[0030] Alternatively, use a single-channel inclined wire paper machine to separately form the porous protective layer and the porous exchange layer by papermaking, and then perform thermal pressing and composite, and then the biodegradable non-woven fabric is obtained.

[0031] A kind of snus, its composition includes a packaging bag and tobacco materials encapsulated in the packaging bag, and the packaging bag is made of the above-mentioned biodegradable non-woven fabric.

[0032] Preferably, the packaging bag is made by ultrasonic heat sealing or ordinary heat sealing of the biodegradable non-woven fabric.

[0033] Preferably, the porous protective layer of the biodegradable non-woven fabric is on the outer layer of the packaging bag, and the porous exchange layer is on the inner layer of the packaging bag. The porous protective layer has a small thickness and small holes, and being arranged on the outer layer of the packaging bag can effectively prevent the tobacco materials in the packaging bag from leaking, while the porous exchange layer has large holes, and being arranged on the inner layer of the packaging bag helps saliva to combine with the tobacco materials in the packaging bag, so as to dissolve the tobacco materials.

[0034] Preferably, the tobacco materials are in granular form, and the particle size is 3 μm to 50 μm.

[0035] The beneficial effects of the present invention are as follows: The biodegradable non-woven fabric of the present invention has the advantages of high porosity, controllable holes, good tensile properties, good tear resistance, good permeability, environmental protection and biodegradability, can be used for making snus packaging, and its raw materials have a wide source, the preparation method is simple, the production cost is low, and it is suitable for large-scale industrial production and application. Description of the Drawings

[0036] Figure 1Overall appearance display diagram of the lip tobacco packaging bag in Example 1.

[0037] Figure 2 Appearance display diagram of the sealing seam of the lip tobacco packaging bag in Example 1. Specific implementation mode

[0038] The present invention will be further explained and illustrated below in conjunction with specific embodiments.

[0039] Example 1:

[0040] A degradable non-woven fabric, and its preparation method is as follows:

[0041] 1) Add nano-cellulose fibers (length 3 μm - 10 μm, diameter 50 nm - 500 nm), regenerated cellulose fibers (length 2 μm - 10 μm, diameter 100 nm - 500 nm), binder fibers, and food-grade acrylic acid into water. The mass ratio of nano-cellulose fibers, regenerated cellulose fibers, and binder fibers is 4:3:3. The binder fibers are composed of water-soluble polyvinyl alcohol fibers (length 3 mm - 6 mm, diameter 10 μm - 20 μm), bicomponent polyester fibers (composed of polyester with a melting point of 110 °C and polyester with a melting point of 260 °C in a mass ratio of 1:2; length 3 mm - 6 mm, diameter 15 μm - 25 μm, linear density 0.1 dtex), and bicomponent polypropylene fibers (composed of a core layer and an outer layer. The core layer is composed of polypropylene with a melting point of 160 °C - 170 °C, and the outer layer is composed of polypropylene with a melting point of 130 °C - 140 °C. The mass ratio of polypropylene with a melting point of 130 °C - 140 °C to polypropylene with a melting point of 160 °C - 170 °C is 1:2; length 3 mm - 6 mm, diameter 15 μm - 25 μm) in a mass ratio of 3:5:2. The weight of food-grade acrylic acid accounts for 10% of the total weight of nano-cellulose fibers, regenerated cellulose fibers, and binder fibers. Stir and disperse evenly to obtain a porous protective layer preparation slurry (concentration 0.005 wt%).

[0042] 2) Add nano-cellulose fibers (length 3 μm - 10 μm, diameter 50 nm - 500 nm), regenerated cellulose fibers (length 2 μm - 10 μm, diameter 100 nm - 500 nm), and food-grade acrylic acid into water. The mass ratio of nano-cellulose fibers to regenerated cellulose fibers is 4:6. The weight of food-grade acrylic acid accounts for 5% of the total weight of nano-cellulose fibers and regenerated cellulose fibers. Stir and disperse evenly to obtain a porous exchange layer preparation slurry (concentration 0.005 wt%).

[0043] 3) Add the porous protective layer preparation slurry and the porous exchange layer preparation slurry to a single-channel inclined wire paper machine respectively for papermaking and forming to make wet paper sheets, then press them for 8 min under the condition of a pressure of 0.8 MPa, then dry them for 20 min under the condition of a temperature of 100 °C, and then calender them for 2 min under the conditions of a temperature of 60 °C and a pressure of 0.3 MPa to obtain a porous protective layer (gram weight is 5 gsm, thickness is 10 μm - 20 μm, pore diameter of holes is 5 μm - 30 μm, porosity is 90%) and a porous exchange layer (gram weight is 15 gsm, thickness is 20 μm - 30 μm, pore diameter of holes is 20 μm - 50 μm) respectively. Then stack the porous protective layer and the porous exchange layer and perform hot pressing and compounding at 110 °C for 8 min to obtain the degradable non-woven fabric.

[0044] A lip tobacco packaging bag, and its preparation method is as follows:

[0045] Stack two pieces of the degradable non-woven fabric in this embodiment, with the porous exchange layers in contact face to face, and then perform hot pressing and compounding at 110 °C for 6 min to obtain the lip tobacco packaging bag (the overall appearance display diagram is as Figure 1 shown, and the appearance display diagram at the sealing seam is as Figure 2 shown).

[0046] Example 2:

[0047] A degradable non-woven fabric, and its preparation method is as follows:

[0048] Add the porous protective layer preparation slurry (except that the mass ratio of water-soluble polyvinyl alcohol fiber, bicomponent polyester fiber and bicomponent polypropylene fiber is adjusted from "3:5:2" to "2:6:2", and the rest is exactly the same as the porous protective layer preparation slurry in Example 1) and the porous exchange layer preparation slurry (the same as in Example 1) to a multi-channel inclined wire paper machine simultaneously for papermaking and forming to make a composite wet paper sheet, then press it for 8 min under the condition of a pressure of 0.8 MPa, then dry it for 20 min under the condition of a temperature of 100 °C, and then calender it for 2 min under the conditions of a temperature of 60 °C and a pressure of 0.3 MPa to obtain the degradable non-woven fabric (the gram weight of the porous protective layer is 8 gsm, the thickness is 10 μm - 20 μm, the pore diameter of the holes is 5 μm - 30 μm, and the porosity is 80%; the gram weight of the porous exchange layer is 15 gsm, the thickness is 20 μm - 30 μm, and the pore diameter of the holes is 20 μm - 50 μm).

[0049] A lip tobacco packaging bag, and its preparation method is as follows:

[0050] Stack two pieces of the degradable non-woven fabric in this embodiment, with the porous exchange layers in contact face to face, and then perform hot pressing and compounding at 110 °C for 6 min to obtain the lip tobacco packaging bag.

[0051] Example 3:

[0052] A degradable non-woven fabric, and its preparation method is as follows:

[0053] Prepare the slurry for the porous protective layer (except that the mass ratio of water-soluble polyvinyl alcohol fiber, bicomponent polyester fiber and bicomponent polypropylene fiber is adjusted from "3:5:2" to "2:5:3", and the rest is exactly the same as the slurry for the porous protective layer in Example 1) and the slurry for the porous exchange layer (the same as in Example 1), and add them to a multi-channel inclined wire papermaking machine at the same time for forming by papermaking to make a composite wet paper sheet. Then, press it for 8 minutes under the condition of a pressure of 0.8 MPa, dry it for 20 minutes under the condition of a temperature of 100 °C, and then calender it for 2 minutes under the conditions of a temperature of 60 °C and a pressure of 0.3 MPa to obtain the degradable non-woven fabric (the grammage of the porous protective layer is 7 gsm, the thickness is 10 μm - 20 μm, the pore diameter of the holes is 5 μm - 30 μm, and the porosity is 84%; the grammage of the porous exchange layer is 15 gsm, the thickness is 20 μm - 30 μm, and the pore diameter of the holes is 20 μm - 50 μm).

[0054] A lip tobacco packaging bag, and its preparation method is as follows:

[0055] Stack two pieces of the degradable non-woven fabric in this example, with the porous exchange layers in contact face to face, and then hot-press and laminate them at 110 °C for 8 minutes to obtain the lip tobacco packaging bag.

[0056] Example 4:

[0057] A degradable non-woven fabric, and its preparation method is as follows:

[0058] Prepare the slurry for the porous protective layer (except that the mass ratio of water-soluble polyvinyl alcohol fiber, bicomponent polyester fiber and bicomponent polypropylene fiber is adjusted from "3:5:2" to "4:4:2", and the rest is exactly the same as the slurry for the porous protective layer in Example 1) and the slurry for the porous exchange layer (the same as in Example 1), and add them to a multi-channel inclined wire papermaking machine at the same time for forming by papermaking to make a composite wet paper sheet. Then, press it for 8 minutes under the condition of a pressure of 0.8 MPa, dry it for 20 minutes under the condition of a temperature of 100 °C, and then calender it for 2 minutes under the conditions of a temperature of 60 °C and a pressure of 0.3 MPa to obtain the degradable non-woven fabric (the grammage of the porous protective layer is 6 gsm, the thickness is 10 μm - 20 μm, the pore diameter of the holes is 5 μm - 30 μm, and the porosity is 87%; the grammage of the porous exchange layer is 15 gsm, the thickness is 20 μm - 30 μm, and the pore diameter of the holes is 20 μm - 50 μm).

[0059] A lip tobacco packaging bag, and its preparation method is as follows:

[0060] Superpose two pieces of the degradable non-woven fabric in this embodiment, make the porous exchange layers contact face to face, and then place them under hot pressing and compounding at 110°C for 8 minutes to obtain the lip tobacco packaging bag.

[0061] Example 5:

[0062] A degradable non-woven fabric is prepared as follows:

[0063] Superpose the porous protective layer (the same as in Example 1) and the porous exchange layer (the same as in Example 1), and then place them under hot pressing and compounding at 260°C for 8 minutes to obtain the degradable non-woven fabric.

[0064] A lip tobacco packaging bag is prepared as follows:

[0065] Superpose two pieces of the degradable non-woven fabric in this embodiment, make the porous exchange layers contact face to face, and then place them under hot pressing and compounding at 110°C for 8 minutes to obtain the lip tobacco packaging bag.

[0066] Performance test:

[0067] The performance test data of the degradable non-woven fabrics in Examples 1 to 5 are shown in the following table:

[0068] Table 1 Performance test data of degradable non-woven fabrics

[0069] Test Items Tensile Strength (N) Tear Strength (N) Liquid Absorption Height (mm) Heat Seal Strength (N) Example 1 19 50 40 15 Example 2 20 49 36 18 Example 3 24 46 41 20 Example 4 21 48 38 17 Example 5 25 52 44 19

[0070] Note:

[0071] Tensile strength: The test is carried out with reference to "GB / T 12914-2018 Determination of tensile strength of paper and paperboard - Constant speed tensile method (20 mm / min)".

[0072] Tear strength: The test is carried out with reference to "GB / T 455-2002 Determination of tear resistance of paper and paperboard".

[0073] Liquid absorption height: The test is carried out with reference to "GB / T 461.1-2002 Determination of capillary liquid absorption height of paper and paperboard (Klemm method)".

[0074] Heat seal strength: The test is carried out with reference to "GB / T 22638.7-2016 Determination method of heat seal strength of aluminum foil".

[0075] It can be seen from Table 1 that the tensile strength of the degradable non-woven fabrics in Examples 1 to 5 is 19 N - 25 N, the tear strength is 46 N - 52 N, the liquid absorption height is 36 mm - 44 mm, and the heat seal strength is 15 N - 20 N, which has excellent mechanical properties (tensile / tear resistance) and liquid penetration performance, indicating that the degradable non-woven fabric of the present invention has good tensile performance, good tear resistance and good permeability, and is suitable for making lip tobacco packaging.

[0076] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement methods and are all included in the protection scope of the present invention.

Claims

1. A degradable non-woven fabric, characterized in that, It comprises a laminated composite of a porous protective layer and a porous exchange layer; the porous protective layer comprises nanofibrillated cellulose fibers, regenerated cellulose fibers, binder fibers and a binder; the porous exchange layer comprises nanofibrillated cellulose fibers, regenerated cellulose fibers and a binder.

2. The degradable non-woven fabric according to claim 1, characterized in that: The mass ratio of nanofibrillated cellulose fibers, regenerated cellulose fibers and binder fibers in the porous protective layer is 1:0.7 - 0.8:0.7 - 0.

8.

3. The degradable non-woven fabric according to claim 1, wherein: The mass ratio of nanofibrillated cellulose fibers and regenerated cellulose fibers in the porous exchange layer is 1:1.5 - 2.

5.

4. The degradable non-woven fabric according to any one of claims 1 to 3, characterized in that: The length of the nanofibrillated cellulose fibers is 3μm - 10μm, and the diameter is 50nm - 500nm; the length of the regenerated cellulose fibers is 2μm - 10μm, and the diameter is 100nm - 500nm.

5. The degradable non-woven fabric according to any one of claims 1 to 3, characterized in that: The binder fibers are compounded from the following fibers by mass percentage: Water-soluble polyvinyl alcohol fibers: 20% - 40%; Bicomponent polyester fibers: 40% - 60%; Bicomponent polypropylene fibers: 20% - 30%.

6. The degradable non-woven fabric according to claim 5, wherein: The length of the water-soluble polyvinyl alcohol fibers is 3mm - 6mm, and the diameter is 10μm - 20μm; the bicomponent polyester fibers comprise a polyester with a melting point of 110°C - 130°C and a polyester with a melting point of 240°C - 260°C; the length of the bicomponent polyester fibers is 3mm - 6mm, the diameter is 15μm - 25μm, and the linear density is 0.1dtex - 0.3dtex; the bicomponent polypropylene fibers comprise a core layer and an outer layer, the core layer comprises polypropylene with a melting point of 160°C - 170°C, and the outer layer comprises polypropylene with a melting point of 130°C - 140°C; the length of the bicomponent polypropylene fibers is 3mm - 6mm, and the diameter is 15μm - 25μm.

7. The degradable non-woven fabric according to any one of claims 1 to 3, characterized in that: The binder is at least one of food-grade acrylic acid and starch.

8. The degradable non-woven fabric according to any one of claims 1 to 3, characterized in that: The grammage of the porous protective layer is 5gsm - 8gsm, the thickness is 10μm - 20μm, the pore diameter of the holes is 5μm - 30μm, and the porosity is 70% - 90%; the grammage of the porous exchange layer is 10gsm - 20gsm, the thickness is 20μm - 30μm, and the pore diameter of the holes is 20μm - 50μm.

9. A method for preparing the degradable non-woven fabric according to any one of claims 1 to 8, characterized in that, It includes the following steps: 1) Disperse the constituent materials of the porous protective layer and the porous exchange layer in water to make slurries respectively; 2) Use a multi-channel inclined wire paper machine to simultaneously form and composite the porous protective layer and the porous exchange layer by papermaking, and then the degradable non-woven fabric is obtained; Alternatively, use a single-channel inclined wire paper machine to separately form the porous protective layer and the porous exchange layer by papermaking, and then perform hot pressing and composite, and then the degradable non-woven fabric is obtained.

10. A lip tobacco, characterized in that, It comprises a packaging bag and tobacco materials encapsulated in the packaging bag; the packaging bag is made of the degradable non-woven fabric according to any one of claims 1 - 8.

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