CN217351948U - Non-heat-sealing tea filter paper with double-layer structure and tea bag - Google Patents
Non-heat-sealing tea filter paper with double-layer structure and tea bag Download PDFInfo
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Abstract
The utility model belongs to the technical field of the special paper new material, especially, relate to a bilayer structure's non-heat-seal tealeaves filter paper and production facility and teabag thereof. A double-layer structure non-heat-seal tea filter paper is composed of a layer A and a layer B, wherein one or two surfaces of the tea filter paper are also provided with a layer C, the layer C is a sizing layer or a coating layer, the layer of the paper close to the net surface is the layer A, paper pulp selected for the layer A is wood pulp with a fiber broadband of more than or equal to 26 mu m, and the paper pulp selected for the layer B is plant fiber pulp with a fiber broadband of less than or equal to 22 mu m; the A layer accounts for 50-75% of the mass of the paper fibers, and the B layer accounts for 25-50% of the mass of the paper fibers. The tea filter paper has small aperture, is well combined with the middle seam of the tea bag, is not easy to leak tea dust, and is smoothly used on a non-heat-sealing tea filter paper forming machine.
Description
Technical Field
The utility model belongs to the technical field of the special paper new material, especially, relate to a bilayer structure's non-heat-seal tealeaves filter paper and production facility and teabag thereof.
Background
Tea leaves are native to China, and are transferred to Japan in the 9 th century of the Gongyuan and transferred to southeast Asia, south Asia and Europe in the 19 th century. Tea leaves are generally put in a teacup or a teapot and are directly soaked or decocted by hot water in east Asia countries such as China, Japan and the like, and leachate is used for drinking. However, in europe and south asia, tea leaves are generally dried, ground into tea dust, packaged in small bags, and the tea bags are put into a teacup or a teapot, soaked or decocted in hot water, and then drunk. Europe also likes to add various flavors and fragrances into tea dust to make tea bags with various tastes. The production of tea bags mainly relates to three production factors: tea raw materials, packaging materials and a bag tea bag forming machine.
The packaging material can be mesh cloth and tea filter paper made of terylene and other chemical fibers, because terylene and other chemical fibers are difficult to degrade, tea filter paper is generally selected as the packaging material of the tea bag, and the tea filter paper is divided into heat-sealing tea filter paper and non-heat-sealing tea filter paper according to the sealing mode and the manufacturing material of the tea bag. Part of hot melt fibers such as PP fibers, PE fibers, ES fibers, PLA fibers and the like are added into the heat-seal tea filter paper, part of materials are not environment-friendly and are not easy to degrade, but the heat-seal tea filter paper has high quantification which is generally more than or equal to 16g.5/m 2 And is relatively easy to produce. More enterprises can produce in our country. Meanwhile, the heat-seal tea bag forming machine is simple to manufacture, low in cost and easy to popularize, and heat-seal tea filter paper is generally selected in domestic markets to manufacture tea bags.
The non-heat-seal tea filter paper can be produced by only about 7-8 enterprises in the world so far, and has harsh production conditions and difficult manufacture. At present, only two large enterprises can produce the non-heat-sealing tea bag forming machine globally, the requirement control is precise, the automation degree is high, the corresponding purchase price is greatly increased, but the non-heat-sealing tea bag filter paper has the fixed quantity of only 12.5g/m 2 On the left and right sides, the filtering performance is better, and the non-heat-seal tea filter paper generally selects various plant fibers and is environment-friendly, so that the non-heat-seal tea filter paper is generally selected to be made into the tea bag in the markets of developed countries such as Europe and America. The global demand for non-heat-sealable tea filter paper is more than twice the demand for heat-sealable tea filter paper. The heat-seal tea filter paper contains a certain amount of heat-seal fibers, and the two layers of paper containing the heat-seal fibers can be bonded by adopting a hot-pressing mode for sealing the tea bag, so that the seal is sealed. But the non-heat-sealing tea filter paper is used for holding paper at the position needing sealingThe folding layer which is about 1.5mm wide and 8 layers is folded, then 8 layers of paper on the folding layer are pressed into a fine-toothed pattern shape by pressure through two meshed pressing wheels with fine teeth, certain binding force is provided between the upper layer of paper and the lower layer of paper, the folding layer is not loosened, and therefore the purpose of sealing is achieved, and the paper has extremely high requirements on the performance of the paper. Because only two manufacturers of the non-heat-sealing tea bag forming machines exist in the market, the produced non-heat-sealing tea filter paper needs to be suitable for the existing tea bag forming machines to be used for production industrialization. The gap and the pressure of a sealing pinch roller of the existing tea bag machine are basically fixed, the adjusting scope is very small, if the quantification is too low, the paper thickness is not enough, the seal is loosened, and the seal is not good; the paper ration is too high, and thickness is too high, and 8 layers of paper are difficult to fold and can not be formed through the clearance of the sealing pinch roller. The quantitative amount of the common non-heat-seal tea filter paper is 12.5g/m 2 On the left and right sides, if the thickness of the paper is too low, the sealing is also not sealed by the sealing pinch roller, and the phenomenon of tea dust leakage is caused at the sealing position. Thus the non-heat sealable leaf filter must be bulky and easily folded and compacted. The packaging speed of the non-heat-sealing tea bag forming machine is high, generally reaches 150-; the non-heat-seal tea leaf filter paper also has good stiffness and flatness, otherwise the paper feeding on the tea bag forming machine can generate shaking phenomenon, which affects the tea bag forming; if the low paper of deflection is softer, also can influence the appearance quality of tea package after the shaping, and the tea package of soft pedal also influences subsequent packing operation speed and quality when making big package, and the customer can not accept. The non-heat-sealing tea filter paper also has strong wet strength, the tea bag is soaked in boiled water or decocted in a teapot, and the longitudinal and transverse wet strength is strong, otherwise, the phenomenon of bag breaking and tea dust leakage can occur. The non-heat-sealing tea leaf filter paper also has good air permeability and water filtration performance, but can not have a more obvious phenomenon of leaking tea dust, if the air permeability is low, the filtering performance can be influenced when the tea bag is soaked, meanwhile, air in the tea bag can not be discharged in time, the tea bag can not be completely immersed in boiled water when being soaked, the tea bag can partially float on the water surface, the filtering efficiency of tea water is influenced, theoretically, the higher the air permeability of the filter paper is, the better the air permeability is, and the tea leaf filter paper can improve the tea qualityThe filtering efficiency of water, but the phenomenon of serious tea dust leakage is prevented at the same time, a proper balance point must be found between the high air permeability and the tea dust leakage prevention performance, the phenomenon of floating of the tea bag cannot occur until the air permeability is more than or equal to 22000cm3/(min. cm2) according to the test, but the tea dust leakage test index requirement can be accepted by customers.
At present, the raw materials for producing the non-heat-sealing tea filter paper by several European manufacturers are about: 50% of softwood pulp, 35% of manila hemp pulp and 15% of hardwood pulp are subjected to inclined net forming, squeezing, drying, surface sizing, drying, coiling, slitting, packaging and other working procedures. The fiber proportion of the combination can have better paper strength, better air permeability, better bulk and better end leakage prevention performance. The world-wide production areas of manila hemp are mostly concentrated in the philippines, and a small amount of manila hemp is produced in ecuador. The yield per year is only 4-6 ten thousand tons according to statistics, and the influence of weather is great, wherein the yield is only a part of the yield used for pulping and papermaking, so the yield is low and the price is high. The price of each ton is about ten times of that of wood pulp, and the wood pulp is high in cost and is not easy to purchase. The use of other plant fibers to replace all or part of the manila hemp pulp has great economic and social benefits.
The Chinese invention patent (application number: 201911057760.5) applied by the applicant discloses a lightweight green non-heat-sealing tea filter paper and a preparation method thereof: the filter paper is prepared by mixing paper making with paper making pulp of paper mulberry bark, bleached softwood pulp and viscose, and the chemical additives added in the pulp are all green natural polymer additives, so that the filter paper has the characteristics of complete natural circulation and biological decomposition. Fiber raw materials select for use in this patent: bleaching softwood pulp, self-made structure leather pulp and viscose fiber. Paper mulberry is not planted industrially at present, paper mulberry bark is difficult to collect in the field, the paper mulberry bark is difficult to be used for producing non-heat-seal tea filter paper industrially, the cost is expected to be higher than that of manila hemp, and the purchase price of viscose staple fiber is about five times that of bleached wood pulp fiber. The patent does not describe the ratio of the three fibers, and the basis weight of the paper is about 0.5g/m lower than that of the conventional product according to the example sample in the patent 2 Left and right, whether quantitative reduction will be to others or notIndices such as thickness, stiffness, etc. have an impact, but it is clear that the cost of making such lightweight non-heat sealable tea filter paper from these three slurries can be very expensive, according to the example sample of this patent, the air permeability (CU) is at 14600- 3 /(min.cm 2 ) Obviously, the tea bag produced by the paper has insufficient filtering performance and is difficult to accept by customers.
The Chinese patent (application number: 201911202396.7) of the applicant discloses a preparation process of non-heat-seal tea filter paper, which comprises the following steps: adopting three kinds of fibers of unbleached viscose fiber, slightly pulped bleached wood pulp (the beating degree is controlled to be 10-30 DEG SR) and various heavier pulped jute pulp (the beating degree is controlled to be 30-80 DEG SR) to form different combinations, forming by an inclined wire paper machine, drying by a drying cylinder, carrying out surface sizing on paper by a spray coating mode, drying by the drying cylinder, reeling, cutting, packaging and the like. Adopt the mode of spray coating to carry out paper surface sizing in this patent, the spray coating mode has decided that the sizing volume is few, and the reinforcing effect is just little relatively, improves the dry of paper, wet strength can only reach the purpose through the beating degree that improves the thick liquids, but can influence the gas permeability of paper like this, can see from the embodiment: the air permeability of the sample is controlled as follows: 16567 and 18906 cm 3 /(min.cm 2 ) This air permeability has a certain influence on the leaching properties of the paper.
The Chinese invention patent (application number: 201911204782. X) applied by the applicant discloses a preparation method of bacteriostatic non-heat-seal tea leaf filter paper, which adopts natural bamboo fiber and bleached softwood pulp as main materials, wherein the bamboo pulp adopts a defibering mode, and the proportion is 50-80 parts by absolute dry weight; the beating degree of bleached softwood pulp is controlled to be 40-80 °SR The proportioning is 20-50 parts by absolute dry weight. Combining the two fibers, forming by an inclined net paper machine, drying by a drying cylinder, carrying out internal sizing on paper by a dipping coating mode, drying by the drying cylinder, reeling, slitting, packaging and the like. In the patent, bamboo pulp of 50-80% shorter fiber is selected, and in order to ensure the strength of paper, the beating degree of bleached softwood pulp is improved (controlled at 40-80) °SR ) To improve the strength of the paper. But this affects the dry and wet strength of the paperDegree and air permeability, as can be seen from the examples: the air permeability of the sample is controlled at 15614-18569 cm 3 /(min.cm 2 ) This air permeability has a certain influence on the leaching properties of the paper. The longitudinal tensile strength of another index of the sample is controlled to be 0.56-0.63kN/m, and the non-heat-seal tea filter paper with the strength can not well meet the requirements of customers, is not beneficial to packaging and forming and can possibly generate a bag breaking phenomenon during soaking.
The requirements of the non-heat-seal tea filter paper required by the market are reflected in the following indexes: quantification: 12.5. + -. 1g/m 2 Thickness of not less than 40 μm, air permeability (1 kPa): not less than 22000cm 3 /(min.cm 2 ) Tensile strength (machine direction): not less than 0.75kN/m, tensile strength (transverse direction): not less than 0.22kN/m 2 Wet strength (machine direction): not less than 0.12kN/m, wet strength (transverse): not less than 0.06kN/m, water filtration time: less than or equal to 1s, paper softness: more than or equal to 70mN (horizontal), more than or equal to 160mN (vertical), small aperture, good combination of the middle seams of the tea bag and difficult tea dust leakage. Because the quantitative of the non-heat-seal tea filter paper is too low, the relative stiffness value of the paper is too low, the detection cannot be carried out on the existing stiffness instruments of various models, and according to European manufacturers, a softness instrument is selected to measure the corresponding index of the paper, so that the stiffness of the paper is indirectly reflected from the softness of the paper, and the higher the softness value of the paper is, the stiffer the paper is. The technical scheme selected by European manufacturers can meet the technical index requirements, but the European manufacturers select nearly 35% of manila hemp, so that the production cost is high, and the phenomenon of unqualified tea dust leakage caused by customer complaints can also occur.
Disclosure of Invention
In order to solve the technical problem, the utility model aims at providing a bilayer structure's non-heat-seal tealeaves filter paper, this tealeaves filter paper aperture will be little, the tea bag centre joint combines not easily to leak the tea dust, uses smoothly on non-heat-seal tealeaves filter paper make-up machine. Further, the utility model discloses the fibre raw materials minimize or do not use the manila hemp thick liquid for use, choose for use the softwood pulp of higher proportion, the less plant fiber of width of lower proportion reaches reduce cost's purpose when reaching or improving target technical index.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a double-layer structure of non-heat-seal tea filter paper, the tea filter paper is formed by A layer and B layer paper making, and also has C layer on one side or two sides of the tea filter paper, the C layer is a sizing layer or a coating layer, one layer of the paper making close to the net surface is the A layer, the paper making pulp selected for the A layer is wood pulp with a fiber broadband of more than or equal to 26 μm, the paper making pulp selected for the B layer is plant fiber pulp with a fiber broadband of less than or equal to 22 μm; the A layer accounts for 50-75% of the mass of the paper fibers, and the B layer accounts for 25-50% of the mass of the paper fibers.
The utility model discloses the non-heat-seal tealeaves filter paper that forms can see both sides form two kinds of different structures about the page from the cross section, and the one deck that leans on the wire side is because the wood pulp of chooseing for use the long width broad of fibre, and this one deck is netted earlier, and dewatering pressure differential is great, and partial tiny fibre can run off, and the page of this one side can be more loose, and the aperture is great, and the gas permeability is better, and the A layer is known as to this one deck. The other side is made of a fiber raw material with a smaller width, the pressure difference is smaller during forming, one side of the net surface is formed under the condition that a pulp layer is arranged, a layer of fine paper sheets is formed on the one side, the second layer is milder in dehydration, the formed fine side is very uniform, holes caused by strong dehydration with a larger pressure difference can be avoided, the uniform and fine paper sheets formed by the layer have relatively lower air permeability, and a good anti-leakage tea dust effect of the tea bag can be formed, and the layer is called as a layer B. The layer B is a uniform and fine fiber layer, the leakage-proof tea dust effect is very good, and the layer can be made thinner, so that the quantitative is a little lower; the layer A is made of wood pulp with relatively wide fibers and high strength, and the quantitative rate of the layer A can be higher so as to meet the characteristic requirement of high strength. The two layers of fibers with different thicknesses are formed respectively, and compared with a layer of mixed papermaking of various fibers, the thickness of the paper can be increased by nearly 2 mu m, so that the bulkiness of the paper is favorably improved. The layer B can be flexibly selected from plant fibers with different performances according to index requirements to be combined so as to meet the invention requirements of the patent. The technical scheme of the non-heat-seal tea filter paper with the double-layer structure can better produce the non-heat-seal tea filter paper which meets the above index requirements and meets the market demands, and simultaneously achieves the purposes of reducing cost and easily controlling indexes.
As a further improvement, the papermaking pulp selected for the layer A is wood pulp with the fiber width of 28-40 mu m, and the papermaking pulp selected for the layer B is plant fiber pulp with the fiber width of 10-20 mu m.
As a further improvement, the A layer accounts for 55-70% of the mass of the paper fibers, and the B layer accounts for 30-45% of the mass of the paper fibers.
As a further improvement, the papermaking pulp selected for the layer A is selected from softwood chemical pulp, and the papermaking pulp selected for the layer B is selected from one or more of hardwood chemical pulp, manila hemp pulp, sisal hemp pulp and bamboo pulp; preferably, the papermaking pulp selected for the layer A is bleached or unbleached southern pine needle chemical pulp, or bleached or unbleached northern pine needle chemical pulp, or 10-90% bleached northern pine needle chemical pulp and 90-10% bleached southern pine needle chemical pulp; preferably, the papermaking pulp selected for the layer B is 30-50% of manila hemp pulp and 50-70% of hardwood pulp, or 100% of bamboo pulp; or 60-80% of bamboo pulp and 20-40% of sisal pulp.
As a further improvement, the beating degree of the slurry of the layer A is controlled as follows: 15-23 ° SR, wet weight: not less than 8 g; the beating degree of the layer B slurry is controlled as follows: 20-25 ° SR, wet weight: not less than 8 g.
As a further improvement, 1.0-2.5% of wet strength agent is also added into the slurry of the layer A and the layer B, and preferably, the wet strength agent is one or two of PAE and PPE.
As a further improvement, the gluing amount of the C layer is 0.5-2.0 g/m 2 Preferably, carboxymethyl cellulose or cationic oxidized starch is selected as the layer C sizing or coating liquid.
Further, the utility model also discloses an this equipment include inclined wire paper machine, inclined wire paper machine includes two-layer head box or two different head boxes, and two different head boxes are the sizing shaping on same forming wire respectively, and two-layer head box of same box sets up different thick liquids as required two-layer, and lower floor's head box sets up A layer thick liquids, and upper strata head box sets up B layer thick liquids. Thus, the double-layer forming of different sizing agents has the following advantages: the softwood pulp with wider width is firstly formed by feeding on the net from a first layer pulp flowing box, a layer of pulp layer is formed on the net surface, then the fiber raw material with smaller fiber width is formed by feeding on the net from a second layer pulp flowing box, at the moment, a layer of pulp layer is already arranged on the net surface, the dehydration pressure difference of the pulp fed on the net on the second layer is obviously reduced, and the fibers including fine fibers in the pulp on the second layer basically cannot be lost.
Further, the utility model also discloses a teabag, wrapping bag and the built-in tea dust in the wrapping bag that constitutes including tealeaves filter paper, tealeaves filter paper adopts a bilayer structure's non-heat-seal tealeaves filter paper.
The utility model discloses owing to adopted foretell technical scheme, bilayer structure non-heat-seal tealeaves filter paper's key index as follows: quantification: 12.5 +/-1.0 g/m 2 About, a thickness of not less than 40 μm, and an air permeability (1 kPa): not less than 22000cm 3 /(min.cm 2 ) Tensile strength (machine direction): not less than 0.75kN/m, tensile strength (transverse direction): not less than 0.25kN/m 2 Wet strength (machine direction): not less than 0.12kN/m, wet strength (transverse): not less than 0.06kN/m, water filtration time: less than or equal to 1s, paper softness: the diameter of the hole is more than or equal to 70mN (horizontal) and more than or equal to 160mN (longitudinal), the hole diameter is small, the tea dust is not easy to leak due to good combination of the middle seam of the tea bag, and the hole is smoothly used on a non-heat-sealing tea filter paper forming machine.
The utility model has the advantages that:
the utility model discloses a bilayer structure non-heat-seal tealeaves filter paper and production method thereof possesses following advantage:
firstly, less or no hemp pulp is selected, so that the production cost can be greatly reduced;
secondly, the paper has higher strength and wet strength;
thirdly, the paper has good bulkiness and high stiffness, the center seam of the tea bag is well combined, and the loosening phenomenon cannot occur;
fourthly, the paper has good air permeability, fast water filtering time and small aperture, and the tea dust is not easy to leak;
and fifthly, each index of the paper is easy to control, the production management is convenient, and each index of the paper is more stable.
Drawings
Fig. 1 is a schematic diagram of the product structure of the present invention.
Detailed Description
The following examples are provided to further illustrate the practice of the present invention, but the scope of the invention is not limited thereto.
A production method of non-heat-seal tea filter paper comprises the following steps: the method comprises the following working procedures of pulp crushing, defibering and pulping, addition of auxiliary agents, pulp proportioning, slag removal, net surfing and forming (papermaking), squeezing, former drying, surface sizing (coating in a machine), later drying, reeling, slitting, packaging and the like.
The raw materials adopted by the utility model are shown in the table 1.
TABLE 1
| Variety of (IV) C | Length of fiber mm | Fiber width μm |
| Broad-leaved wood chemical pulp | 0.759 | 19.7 |
| Needle-leaved wood chemical pulp (northern pine) | 2.069 | 29.5 |
| Needle-leaved wood chemical pulp (southern pine) | 2.567 | 33.7 |
| Manila hemp pulp | 3.361 | 21.8 |
| Sisal pulp | 1.768 | 20.3 |
| Bamboo pulp | 1.492 | 18.3 |
The present invention will be further described with reference to the following specific examples.
Example 1
1) Proportioning the slurry: layer A1 proportioning: 100% slurry C, where slurry C refers to: bleached southern pine is softwood pulp of the main raw material; and (3) proportioning of the layer B: 100% slurry D, where slurry D refers to: 40% manila pulp +60% bleached hardwood pulp. Respectively adding the two layers of pulp into a pulper for pulping;
2) defibering and pulping: the pulp of the layer A1 and the layer B2 is respectively defibered and pulped after being disintegrated and soaked, and the concentration of pulping is controlled to be 4.0-6.0%; the beating degree of the slurry of the layer A1 is controlled as follows: 21-23 ° SR, wet weight: not less than 8 g; the beating degree of the slurry of the B layer 2 is controlled as follows: 20-22 ° SR, wet weight: not less than 8 g. After the defibering and pulping are finished, respectively placing the materials into corresponding pulping tanks;
3) slurry preparation: respectively putting the ground slurry of the layer A1 and the layer B2 into different corresponding slurry mixing tanks, adding a wet strength agent, and diluting to the concentration of 0.8-1.0%; wet strength agent addition amount: 1.0 percent.
4) Manufacturing paper: diluting the prepared slurry of the two layers to the concentration of 0.02-0.04%, pumping the slurry to different fore-pools, and forming the slurry by two layers through an inclined net on a fan pump, wherein two different head boxes are selected to form the slurry on a forming net. Wherein the A layer 1 accounts for the following ratio in the mass of paper fibers: 70 percent, the proportion of the B layer 2 in the mass of the paper fiber is as follows: 30 percent. I.e. if the basis weight of the paper before sizing is 12.5g/m 2 Layer A1 was 8.75g/m 2 The B layer 2 was 3.75g/m 2 Squeezing and drying;
5) surface sizing: feeding the paper sheet dried in the previous process into a surface sizing device for surface sizing to form a C layer 3; the surface sizing liquid is carboxymethyl cellulose. The sizing amount is 0.5g/m 2 。
6) The quantitative rate of paper is controlled at 12.0-13.0g/m 2 。
7) Drying, coiling, cutting and packaging.
The detection results are shown in the attached table.
Example 2
1) Proportioning the slurry: layer A1 is prepared by the following steps: 100% slurry C, where slurry C refers to: needle pulp with unbleached southern pine as main material; and (3) proportioning of the layer B2: 100% slurry D, where slurry D refers to: 40% manila pulp +60% unbleached hardwood pulp. Respectively adding the two layers of pulp into a pulper for pulping;
2) defibering and pulping: the pulp of the layer A1 and the layer B2 is respectively defibered and pulped after being disintegrated and soaked, and the concentration of the pulping is controlled to be 4.0-6.0%; the beating degree of the slurry of the layer A1 is controlled as follows: 21-23 ° SR, wet weight: not less than 8 g; the beating degree of the slurry of the B layer 2 is controlled as follows: 20-22 ° SR, wet weight: not less than 8 g. After the defibering and pulping are finished, respectively placing the materials into corresponding pulping tanks;
3) slurry preparation: respectively putting the ground slurry of the layer A1 and the slurry of the layer B2 into different corresponding slurry preparation pools, adding a wet strength agent, and diluting to the concentration of 0.8-1.0%; wet strength agent addition amount: 1.0 percent.
4) Manufacturing paper: diluting the prepared slurry of the two layers to the concentration of 0.02-0.04%, pumping the slurry to different fore-pools, and forming the slurry by two layers through an inclined net on a fan pump, wherein a mode that a head box forms the slurry in two layers and a forming net is adopted. Wherein the A layer 1 accounts for the following ratio in the mass of paper fibers: 70 percent, the proportion of the B layer 2 in the mass of the paper fiber is as follows: 30 percent. I.e. if the basis weight of the paper before sizing is 12.5g/m 2 Layer A1 is 8.75g/m 2 The B layer 2 was 3.75g/m 2 Squeezing and drying;
5) surface sizing: feeding the paper sheet dried in the previous process into a surface sizing device for surface sizing to form a C layer 3; the surface sizing liquid is carboxymethyl cellulose. The sizing amount is 0.5g/m 2 。
6) The quantitative rate of paper is controlled at 12.0-13.0g/m 2 。
7) Drying, coiling, cutting and packaging.
The detection results are shown in the attached table.
Example 3
1) Proportioning the slurry: layer A1 proportioning: 100% slurry C, where slurry C refers to: bleached northern pine is used as needle pulp of main raw material; and (3) proportioning of the layer B2: 100% slurry D, where slurry D refers to: 100% of bamboo pulp. Respectively adding the two layers of pulp into a pulper for pulping;
2) defibering and pulping: the pulp of the layer A1 and the layer B2 is respectively defibered and pulped after being disintegrated and soaked, and the concentration of the pulping is controlled to be 4.0-6.0%; the beating degree of the slurry of the layer A1 is controlled as follows: 15-18 ° SR, wet weight: not less than 8 g; the beating degree of the slurry of the B layer 2 is controlled as follows: 21-23 ° SR, wet weight: not less than 8 g. After the defibering and pulping are finished, respectively placing the materials into corresponding pulping tanks;
3) slurry preparation: respectively putting the ground slurry of the layer A1 and the slurry of the layer B2 into different corresponding slurry preparation pools, adding a wet strength agent, and diluting to the concentration of 0.8-1.0%; wet strength agent addition amount: 1.5 percent.
4) Manufacturing paper: diluting the prepared slurry of the two layers to the concentration of 0.03-0.05%, pumping the slurry to different fore-pools, and forming the slurry by two layers through an inclined net on a fan pump, wherein two different head boxes are selected to form the slurry on a forming net. Wherein the A layer 1 accounts for the following ratio in the mass of paper fibers: 60%, the ratio of the B layer 2 in the mass of the paper fibers is as follows: 40 percent. I.e. if the basis weight of the paper before sizing is 12.5g/m 2 Layer A1 is 7.5 g/m 2 The B layer 2 was 5.0g/m 2 Squeezing and drying;
5) surface sizing: feeding the paper sheet dried in the previous process into a surface sizing device for surface sizing to form a C layer 3; the surface sizing liquid is carboxymethyl cellulose. The sizing amount is 0.8g/m 2 。
6) The quantitative rate of paper is controlled at 12.0-13.0g/m 2 。
7) Drying, coiling, cutting and packaging.
The detection results are shown in the attached table.
Example 4
1) Proportioning the slurry: layer A1 is prepared by the following steps: 100% slurry C, where slurry C refers to: softwood pulp with 50% bleached northern pine as the main raw material + softwood pulp with 50% bleached southern pine as the main raw material; and (3) proportioning of the layer B2: 100% slurry D, where slurry D refers to: 100% of bamboo pulp. Respectively adding the two layers of pulp into a pulper for pulping;
2) fluffing and pulping: the pulp of the layer A1 and the layer B2 is respectively defibered and pulped after being disintegrated and soaked, and the concentration of the pulping is controlled to be 4.0-6.0%; the beating degree of the slurry of the layer A1 is controlled as follows: 15-18 ° SR, wet weight: not less than 8 g; the beating degree of the slurry of the B layer 2 is controlled as follows: 21-23 ° SR, wet weight: more than or equal to 6g. After the defibering and pulping are finished, respectively placing the materials into corresponding pulping tanks;
3) slurry preparation: respectively putting the ground slurry of the layer A1 and the slurry of the layer B2 into different corresponding slurry preparation pools, adding a wet strength agent, and diluting to the concentration of 0.8-1.0%; wet strength agent addition amount: 1.5 percent.
4) Manufacturing paper: diluting the prepared slurry of the two layers to the concentration of 0.04-0.06%, pumping the slurry to different fore-pools, and forming the slurry by two layers through an inclined net on a fan pump, wherein two different head boxes are selected to form the slurry on a forming net. Wherein the A layer 1 accounts for the following ratio in the mass of paper fibers: 55 percent, the B layer 2 accounts for the following ratio in the mass of the paper fibers: 45 percent. I.e. if the basis weight of the paper before sizing is 12.5g/m 2 Layer A1 is 6.875g/m 2 The B layer 2 was 5.625g/m 2 Squeezing and drying;
5) surface sizing: feeding the paper sheet dried in the previous process into a surface sizing device for surface sizing to form a C layer 3; the surface sizing liquid is carboxymethyl cellulose. The sizing amount is 0.9g/m 2 。
6) The quantitative rate of paper is controlled at 12.0-13.0g/m 2 。
7) Drying, coiling, cutting and packaging.
The detection results are shown in the attached table.
Example 5
1) Proportioning the slurry: layer A1 proportioning: 100% slurry C, where slurry C refers to: bleached southern pine is softwood pulp of the main raw material; and (3) proportioning of the layer B2: 100% slurry D, where slurry D refers to: 70 percent of bamboo pulp and 30 percent of sisal pulp. Respectively adding the two layers of pulp into a pulper for pulping;
2) fluffing and pulping: the pulp of the layer A1 and the layer B2 is respectively defibered and pulped after being disintegrated and soaked, and the concentration of the pulping is controlled to be 4.0-6.0%; the beating degree of the slurry of the layer A1 is controlled as follows: 21-23 ° SR, wet weight: not less than 8 g; the beating degree of the slurry of the B layer 2 is controlled as follows: 19-20 ° SR, wet weight: not less than 8 g. After the defibering and pulping are finished, respectively placing the materials into corresponding pulping tanks;
3) slurry preparation: respectively putting the ground slurry of the layer A1 and the slurry of the layer B2 into different corresponding slurry preparation pools, adding a wet strength agent, and diluting to the concentration of 0.8-1.0%; wet strength agent addition amount: 1.5 percent.
4) Manufacturing paper: diluting the prepared slurry of the two layers to the concentration of 0.03-0.05%, pumping the slurry to different fore-pools, and forming the slurry by two layers through an inclined net on a fan pump, wherein two different head boxes are selected to form the slurry on a forming net. Wherein the A layer 1 accounts for the following ratio in the mass of paper fibers: 65% of B layer 2 in the paper fiber massThe ratio is as follows: 35 percent. I.e. if the basis weight of the paper before sizing is 12.5g/m 2 Layer A1 was 8.125g/m 2 And the B layer 2 is 4.375g/m 2 Squeezing and drying;
5) surface sizing: feeding the paper sheet dried in the previous path into an in-machine device for in-machine coating; the coating liquid is cationic oxidized starch. The sizing amount is 1.0g/m 2 。
6) The quantitative rate of paper is controlled at 12.0-13.0g/m 2 。
7) Drying, coiling, cutting and packaging.
The detection results are shown in the attached table.
Example 6
1) Proportioning the slurry: layer A1 proportioning: 100% slurry C, where slurry C refers to: softwood pulp with 50% bleached northern pine as a main raw material and softwood pulp with 50% bleached southern pine as a main raw material; and (3) proportioning of the layer B2: 100% slurry D, where slurry D refers to: 40% of bamboo pulp, 30% of manila hemp pulp and 30% of bleached broad leaf pulp. Respectively adding the two layers of pulp into a pulper for pulping;
2) fluffing and pulping: the pulp of the layer A1 and the layer B2 is respectively defibered and pulped after being disintegrated and soaked, and the concentration of the pulping is controlled to be 4.0-6.0%; the beating degree of the slurry of the layer A1 is controlled as follows: 18-20 ° SR, wet weight: not less than 8 g; the beating degree of the slurry of the B layer 2 is controlled as follows: 21-23 ° SR, wet weight: more than or equal to 6g. After the defibering and pulping are finished, respectively placing the materials into corresponding pulping tanks;
3) slurry preparation: respectively putting the ground slurry of the layer A1 and the slurry of the layer B2 into different corresponding slurry preparation pools, adding a wet strength agent, and diluting to the concentration of 0.8-1.0%; wet strength agent addition amount: 1.5 percent.
4) Manufacturing paper: diluting the prepared slurry of the two layers to the concentration of 0.03-0.05%, pumping the slurry to different fore-pools, and forming the slurry by two layers through an inclined net on a fan pump, wherein a mode that a head box forms the slurry in two layers and a forming net is adopted. Wherein the A layer 1 accounts for the following ratio in the mass of paper fibers: 60 percent, the proportion of the B layer 2 in the mass of the paper fiber is as follows: 40 percent. I.e. if the basis weight of the paper before sizing is 12.5g/m 2 Layer A1 is 7.5 g/m 2 The B layer 2 was 5.0g/m 2 Squeezing and drying;
5) surface sizing: paper dried in the front passThe page enters a surface sizing device for surface sizing to form a C layer 3; the surface sizing liquid is carboxymethyl cellulose. The sizing amount is 0.9g/m 2 。
6) The quantitative rate of paper is controlled at 12.0-13.0g/m 2 。
7) Drying, coiling, cutting and packaging.
The detection results are shown in the attached table.
Comparative example 1
1) Proportioning the slurry: layer A1 proportioning: 100% slurry D, where slurry D refers to: 40% manila hemp pulp +60% bleached hardwood pulp; and (3) proportioning of the layer B2: 100% slurry C, where slurry C refers to: bleached southern pine is softwood pulp as the main raw material. Respectively adding the two layers of pulp into a pulper for pulping;
2) fluffing and pulping: the pulp of the layer A1 and the layer B2 is respectively defibered and pulped after being disintegrated and soaked, and the concentration of pulping is controlled to be 4.0-6.0%; the beating degree of the slurry of the layer A1 is controlled as follows: 21-23 ° SR, wet weight: not less than 8 g; the beating degree of the slurry of the layer B2 is controlled as follows: 20-22 ° SR, wet weight: not less than 8 g. After the defibering and pulping are finished, respectively placing the materials into corresponding pulping tanks;
3) slurry preparation: respectively putting the ground slurry of the layer A1 and the slurry of the layer B2 into different corresponding slurry preparation pools, adding a wet strength agent, and diluting to the concentration of 0.8-1.0%; wet strength agent addition amount: 1.0 percent.
4) Manufacturing paper: diluting the prepared slurry of the two layers to the concentration of 0.03-0.05%, pumping the slurry to different fore-pools, and forming the slurry by two layers through an inclined net on a fan pump, wherein two different head boxes are selected to form the slurry on a forming net. Wherein the A layer 1 accounts for the following ratio in the mass of paper fibers: 45 percent, the B layer 2 accounts for the following ratio in the mass of the paper fibers: and 55 percent. I.e. if the basis weight of the paper before sizing is 12.5g/m 2 Layer A1 is 5.6g/m 2 The B layer 2 was 6.9 g/m 2 Squeezing and drying;
5) surface sizing: feeding the paper sheet dried in the previous process into a surface sizing device for surface sizing to form a C layer 3; the surface sizing liquid is carboxymethyl cellulose. The sizing amount is 0.5g/m 2 。
6) The paper ration is controlled between 12.0 and 13.0g/m 2 。
7) Drying, coiling, cutting and packaging.
The detection results are shown in the attached table.
Comparative example 2
1) Proportioning the slurry: layer A1 proportioning: 100% slurry C, where slurry C refers to: bleached southern pine is softwood pulp of the main raw material; and (3) proportioning of the layer B2: 100% slurry D, where slurry D refers to: 40% manila pulp +60% bleached hardwood pulp. Respectively adding the two layers of pulp into a pulper for pulping;
2) fluffing and pulping: the pulp of the layer A1 and the layer B2 is respectively defibered and pulped after being disintegrated and soaked, and the concentration of the pulping is controlled to be 4.0-6.0%; the beating degree of the slurry of the layer A1 is controlled as follows: 21-23 ° SR, wet weight: not less than 8 g; the beating degree of the slurry of the B layer 2 is controlled as follows: 20-22 ° SR, wet weight: not less than 8 g. After the defibering and pulping are finished, respectively placing the materials into corresponding pulping tanks;
3) slurry preparation: respectively putting the ground slurry of the layer A1 and the layer B2 into different corresponding slurry mixing tanks, adding a wet strength agent, and diluting to the concentration of 0.8-1.0%; wet strength agent addition amount: 1.0 percent.
4) Manufacturing paper: diluting the prepared slurry of the two layers to the concentration of 0.03-0.05%, pumping the slurry to different fore-pools, and forming the slurry by two layers through an inclined net on a fan pump, wherein two different head boxes are selected to form the slurry on a forming net. Wherein the A layer 1 accounts for the following ratio in the mass of paper fibers: 45 percent, the B layer 2 accounts for the following ratio in the mass of the paper fibers: and 55 percent. I.e. if the basis weight of the paper before sizing is 12.5g/m 2 Layer A1 is 5.6g/m 2 The B layer 2 was 6.9 g/m 2 Squeezing and drying;
5) surface sizing: feeding the paper sheet dried in the previous process into a surface sizing device for surface sizing to form a C layer 3; the surface sizing liquid is carboxymethyl cellulose. The sizing amount is 0.5g/m 2 。
6) The quantitative rate of paper is controlled at 12.0-13.0g/m 2 。
7) Drying, coiling, cutting and packaging.
The detection results are shown in the attached table.
Comparative example 3
1) Proportioning the slurry: layer A1 proportioning: 100% slurry C, where slurry C refers to: bleached northern pine is used as needle pulp of main raw material; and (3) proportioning of the layer B2: 100% slurry D, where slurry D refers to: 100% of bamboo pulp. Respectively adding the two layers of pulp into a pulper for pulping;
2) fluffing and pulping: the pulp of the layer A1 and the layer B2 is respectively defibered and pulped after being disintegrated and soaked, and the concentration of pulping is controlled to be 4.0-6.0%; the beating degree of the slurry of the layer A1 is controlled as follows: 15-18 ° SR, wet weight: not less than 8 g; the beating degree of the slurry of the layer B2 is controlled as follows: 21-23 ° SR, wet weight: not less than 8 g. After the defibering and pulping are finished, respectively placing the materials into corresponding pulping tanks;
3) slurry preparation: respectively putting the ground slurry of the layer A1 and the slurry of the layer B2 into different corresponding slurry preparation pools, adding a wet strength agent, and diluting to the concentration of 0.8-1.0%; wet strength agent addition amount: 1.5 percent.
4) Manufacturing paper: diluting the prepared slurry of the two layers to the concentration of 0.03-0.05%, pumping the slurry to different fore-pools, and forming the slurry by two layers through an inclined net on a fan pump, wherein two different head boxes are selected to form the slurry on a forming net. Wherein the A layer 1 accounts for the following ratio in the mass of paper fibers: 80 percent, the B layer 2 accounts for the following ratio in the mass of the paper fibers: 20 percent. I.e. if the basis weight of the paper before sizing is 12.5g/m 2 Layer A1 is 10g/m 2 The B layer 2 was 2.5g/m 2 Squeezing and drying;
5) surface sizing: feeding the paper sheet dried in the previous process into a surface sizing device for surface sizing to form a C layer 3; the surface sizing liquid is carboxymethyl cellulose. The sizing amount is 0.8g/m 2 。
6) The quantitative rate of paper is controlled at 12.0-13.0g/m 2 。
7) Drying, coiling, cutting and packaging.
The detection results are shown in the attached table.
Comparative example 4
1) Proportioning the slurry: layer A1 proportioning: 100% slurry C, where slurry C refers to: bleached northern pine is used as needle pulp of main raw material; and (3) proportioning of the layer B2: 100% slurry D, where slurry D refers to: 100% of bamboo pulp. Respectively adding the two layers of pulp into a pulper for pulping;
2) defibering and pulping: the pulp of the layer A1 and the layer B2 is respectively defibered and pulped after being disintegrated and soaked, and the concentration of the pulping is controlled to be 4.0-6.0%; the beating degree of the slurry of the layer A1 is controlled as follows: 15-18 ° SR, wet weight: not less than 8 g; the beating degree of the slurry of the B layer 2 is controlled as follows: 21-23 ° SR, wet weight: not less than 8 g. After the defibering and pulping are finished, respectively placing the materials into corresponding pulping tanks;
3) slurry preparation: respectively putting the ground slurry of the layer A1 and the layer B2 into different corresponding slurry mixing tanks, adding a wet strength agent, and diluting to the concentration of 0.8-1.0%; wet strength agent addition amount: 1.5 percent.
4) Manufacturing paper: diluting the prepared slurry of the two layers to the concentration of 0.03-0.05%, pumping the slurry to different fore-pools, and forming the slurry by two layers through an inclined net on a fan pump, wherein two different head boxes are selected to form the slurry on a forming net. Wherein the A layer 1 accounts for the following ratio in the mass of paper fibers: 30 percent, the B layer 2 accounts for the following ratio in the mass of the paper fibers: 70 percent. I.e. if the basis weight of the paper before sizing is 12.5g/m 2 Layer A1 was 3.75g/m 2 And the B layer 2 is 8.75g/m 2 Squeezing and drying;
5) surface sizing: feeding the paper sheet dried in the previous process into a surface sizing device for surface sizing to form a C layer 3; the surface sizing liquid is carboxymethyl cellulose. The sizing amount is 0.8g/m 2 。
6) The quantitative rate of paper is controlled at 12.0-13.0g/m 2 。
7) Drying, coiling, cutting and packaging.
The detection results are shown in the attached table.
Comparative example 5
1) Proportioning the slurry: 70% bleached softwood pulp (wherein the softwood pulp taking southern pine and northern pine as main raw materials is 35% respectively) +12% manila hemp pulp +18% bleached hardwood pulp, and four kinds of pulp are mixed and fed;
2) fluffing and pulping: disintegrating and soaking the mixed pulp, and then performing defibering and pulping, wherein the concentration of the ground pulp is controlled to be 4.0-6.0%; the beating degree is controlled as follows: 20-21 ° SR, wet weight: not less than 7 g. After the defibering and pulping are finished, placing the pulp into a pulping tank;
3) slurry preparation: putting the ground mixed slurry into a slurry preparation pool, adding a wet strength agent, and diluting to a concentration of 0.8-1.0%; wet strength agent addition amount: 1.0 percent.
4) Manufacturing paper: diluting the prepared slurry to 0.03-0.05%, pumping the slurry to a front pool, forming the slurry once by an inclined net on a fan pump, squeezing and drying;
5) surface sizing: feeding the paper sheet dried in the previous process into a surface sizing device for surface sizing to form a C layer 3; the surface sizing liquid is carboxymethyl cellulose. The sizing amount is 0.5g/m 2 。
6) The quantitative rate of paper is controlled at 12.0-13.0g/m 2 。
7) Drying, coiling, cutting and packaging.
The detection results are shown in the attached table.
Comparative examples 6 and 7 are commercially available products produced by european producers.
The results are shown in the attached tables 2 and 3.
TABLE 2
| Index (I) | Unit of | Target value | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 | Comparative example 6 | Comparative example 7 |
| Quantification of | g/m 2 | 12.5±1.0 | 12.9 | 12.6 | 13.0 | 12.4 | 12.7 | 11.8 | 12.6 |
| Thickness of | μm | ≥40 | 41.1 | 40.2 | 37.1 | 41.3 | 41.2 | 40.9 | 40.3 |
| Air permeability | cm 3 /(min.cm 2 ) | ≥22000 | 35263 | 17659 | 18842 | 36452 | 36450 | 39455 | 28749 |
| Longitudinal tensile strength | kN/m | ≥0.75 | 0.85 | 0.70 | 0.92 | 0.82 | 0.81 | 0.73 | 1.11 |
| Transverse tensile strength | kN/m 2 | ≥0.25 | 0.28 | 0.22 | 0.35 | 0.31 | 0.30 | 0.25 | 0.32 |
| Longitudinal wet strength | kN/m | ≥0.12 | 0.17 | 0.16 | 0.23 | 0.19 | 0.18 | 0.20 | 0.18 |
| Transverse wet strength | kN/m | ≥0.06 | 0.08 | 0.07 | 0.10 | 0.09 | 0.09 | 0.08 | 0.10 |
| Time of filtration | s | ≤1 | 1 | 2 | 2 | 1 | 1 | 1 | 1 |
| Transverse softness | mN | ≥70 | 84 | 65 | 75 | 89 | 77 | 72 | 81 |
| Longitudinal softness | mN | ≥160 | 168 | 155 | 176 | 201 | 178 | 171 | 192 |
| Running state on tea packaging machine | - | Good taste | Good taste | Good taste | Good for | Good taste | Good taste | Good taste | Good taste |
| End of leakage situation | - | Not good | Not good | Good taste | Not good | Not good | Not good | Good for | Good taste |
TABLE 3
| Index (I) | Unit | Target value | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 |
| Quantification of | g/m 2 | 12.5±1.0 | 12.8 | 12.5 | 12.9 | 13.1 | 12.6 | 12.9 |
| Thickness of | μm | ≥40 | 42.1 | 42.1 | 43.9 | 44.5 | 42.5 | 40.9 |
| Degree of air permeability | cm 3 /(min.cm 2 ) | ≥22000 | 33415 | 32196 | 31463 | 35168 | 30567 | 28047 |
| Longitudinal tensile strength | kN/m | ≥0.75 | 0.84 | 0.89 | 0.96 | 0.79 | 0.81 | 0.87 |
| Transverse tensile Strength | kN/m 2 | ≥0.25 | 0.27 | 0.30 | 0.32 | 0.28 | 0.26 | 0.29 |
| Longitudinal wet strength | kN/m | ≥0.12 | 0.19 | 0.20 | 0.23 | 0.18 | 0.18 | 0.20 |
| Transverse wet strength | kN/m | ≥0.06 | 0.08 | 0.09 | 0.10 | 0.08 | 0.08 | 0.09 |
| Time of filtration | s | ≤1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Transverse softness | mN | ≥70 | 87 | 89 | 91 | 96 | 81 | 79 |
| Longitudinal softness | mN | ≥160 | 186 | 195 | 198 | 206 | 179 | 176 |
| Running state on tea packaging machine | - | Good taste | Good taste | Good taste | Good taste | Good taste | Good taste | Good taste |
| End of leakage situation | - | Good taste | Good taste | Good taste | Good taste | Good taste | Good taste | Good taste |
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention, including by way of illustration of the disclosed embodiments. Various modifications to these embodiments will be readily apparent to those skilled in the art. The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A double-layer structure non-heat-sealing tea filter paper is characterized in that the tea filter paper is composed of an A layer (1) and a B layer (2), a C layer (3) is arranged on one or two surfaces of the tea filter paper, the C layer (3) is an adhesive layer or a coating layer, one layer of the paper close to a net surface is the A layer (1), paper making pulp selected for the A layer (1) is wood pulp with a fiber broadband of more than or equal to 26 mu m, and paper making pulp selected for the B layer (2) is plant fiber pulp with a fiber broadband of less than or equal to 22 mu m; the A layer (1) accounts for 50-75% of the mass of the paper fibers, and the B layer (2) accounts for 25-50% of the mass of the paper fibers.
2. The non-heat-seal tea leaf filter paper with the double-layer structure as claimed in claim 1, wherein the papermaking pulp selected for the layer A (1) is wood pulp with a fiber width of 28-40 μm, and the papermaking pulp selected for the layer B (2) is plant fiber pulp with a fiber width of 10-20 μm.
3. The non-heat-seal tea leaf filter paper with the double-layer structure as claimed in claim 1, wherein the A layer (1) accounts for 55-70% of the mass of paper fibers, and the B layer (2) accounts for 30-45% of the mass of the paper fibers.
4. The non-heat-sealable tea leaf filter paper with a double-layer structure as claimed in any one of claims 1 to 3, wherein the papermaking pulp selected from the group consisting of softwood chemical pulp for the layer A (1) and hardwood chemical pulp, manila hemp pulp, sisal hemp pulp and bamboo pulp for the layer B (2).
5. The non-heat-seal tea leaf filter paper with the double-layer structure as claimed in claim 4, wherein the papermaking pulp selected for the layer A (1) is bleached or unbleached southern pine needle chemical pulp or bleached or unbleached northern pine needle chemical pulp.
6. A double-layer structured non-heat-sealable tea leaf filter paper according to any of claims 1 to 3, wherein the degree of beating of the slurry of the a layer (1) is controlled to be: 15-23 ° SR, wet weight: not less than 8 g; the beating degree of the slurry of the layer B (2) is controlled as follows: 20-25 ° SR, wet weight: not less than 8 g.
7. The non heat-sealable tea leaf filter paper of a double layer structure as claimed in any of claims 1 to 3 wherein the amount of glue applied to the C layer (3) is 0.5 to 2.0 g/m 2 。
8. The double-layer structured non-heat-sealable tea leaf filter paper as claimed in claim 1, wherein the sizing or coating liquid for the layer C (3) is carboxymethyl cellulose or cationic oxidized starch.
9. A teabag comprising a bag made of tea filter paper and tea dust contained in the bag, wherein the tea filter paper is the non-heat-sealable tea filter paper having a two-layer structure according to any one of claims 1 to 8.
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| CN116356609B (en) * | 2023-05-08 | 2024-03-19 | 浙江凯恩新材料有限公司 | High-internal bonding strength heat-sealing tea filter paper with double-layer structure, preparation method and application |
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