Tea filter paper, preparation method and tea filter bag

Abstract

The invention relates to tea filter paper, a preparation method and a tea filter bag. The tea leaf filter paper is formed by compounding a fiber filter paper layer and a heat sealing layer, the mass ratio of the heat sealing layer is 20-35 wt%, the fiber filter paper layer is obtained by performing papermaking on plant fibers, the heat sealing layer is obtained by performing mixed papermaking on heat sealing fibers, viscose fibers and plant fibers, and the tea leaf filter paper is subjected to continuous folding and flattening treatment. The folding part on the tea filter paper can form a strip-shaped overlapping area, and the tea filter paper is further subjected to local hot pressing treatment, so that adjacent heat sealing layers in the overlapping area locally form an adhesion area, and the effect of fixing the folding state is achieved. The tea filter paper is subjected to continuous folding process treatment, the folding effect is maintained by arranging the adhesion area, and when the tea filter paper is tightened, the adhesion area is very easy to break, so that the folded tea filter paper is leveled, the surface area is obviously increased, and the tightening state is released, and therefore, when the tea filter paper is made into a tea bag, the condition that a seal is cracked is not easy to occur.

Description

Technical Field

[0001] The invention relates to edible filter paper, in particular to tea filter paper, a preparation method and a tea filter bag. Background Art

[0002] Heat-seal tea filter paper is often used to make Chinese medicine bags, coffee bags, barley tea bags and tea bags. After long-term high-temperature soaking, the tea leaves, Chinese medicine, barley tea, etc. in the filter bag will swell and increase in volume significantly. The heat-sealed part of the tea bag will be pressed outwards from the two layers of paper due to the increase in volume, which can easily cause the bag to break.

[0003] In order to solve this problem, someone disclosed an invention patent entitled "A double-layer structure with high internal bonding strength, heat-sealed tea filter paper, preparation method and application" (publication number CN116356609B). The tea filter paper is composed of a base layer and a heat-sealed layer. The base layer is made of natural plant fibers, and the heat-sealed layer accounts for 60-80% of the mass of the entire paper sheet. The heat-sealed layer is composed of the following fibers by mass: 40-60% heat-sealed fiber, 30-60% viscose fiber, and 0-20% second natural plant fiber. The invention increases the tensile strength of the filter paper itself and the bonding strength of the edge sealing part by increasing the proportion of heat-sealed fibers and viscose fibers in the filter paper. As a sacrifice, the proportion of plant fibers is significantly reduced compared to conventional tea bags. Therefore, the proportion of artificial additives in the modified tea filter paper and the tea bags prepared therefrom is relatively high. Although they are basically edible grade materials, they will still increase the risk of environmental pollution and are not in line with the concept of sustainable development. Summary of the invention

[0004] The invention provides a tea filter paper which is not easy to break, and solves the problem in the prior art that the sealed edge is easy to crack due to the expansion of the contents in the tea bag during use.

[0005] The above technical problems of the present invention are mainly solved by the following technical solutions: a tea filter paper that is not easy to break, the tea filter paper is composed of a fiber filter paper layer and a heat sealing layer, the mass of the heat sealing layer accounts for 20 to 35wt%, the fiber filter paper layer is obtained by making paper from plant fibers, and the heat sealing layer is obtained by making paper from a mixture of heat sealing fibers, viscose fibers and plant fibers. The tea filter paper is continuously folded and flattened, and the folded parts on the tea filter paper will form strip-shaped overlapping areas. The tea filter paper is also locally hot-pressed, so that adjacent heat sealing layers in the overlapping area locally form an adhesion area, which has the effect of fixing the folded state.

[0006] Furthermore, the folded shape of the tea filter paper is a continuous "Ω" type or a continuous "N" type.

[0007] Furthermore, the width of the overlapping area is between 3 and 5 mm.

[0008] Furthermore, the adhesion area is in the form of dots or lines, and its width is 1 to 2 mm.

[0009] Furthermore, the area of ​​the adhesion zone accounts for no more than 5% of the area of ​​the tea filter paper in a shielding state.

[0010] Further, the heat-sealing layer is composed of the following fibers by mass percentage: 30 to 50% heat-sealing fiber, 40 to 50% viscose fiber, and 5 to 20% plant fiber, wherein the heat-sealing fiber is one or a combination of PP and ES;

[0011] Selection range of plant fiber: one or more combinations of log pulp, hemp pulp, and bamboo pulp. The beating degree of the plant fiber is 22 to 28°SR.

[0012] The present invention also discloses a method for preparing tea filter paper that is not easy to break, comprising the following steps: S1, preparing raw materials, wherein plant fiber can be purchased or prepared, and the preparation process is an existing conventional preparation process, which will not be described in detail here, and heat-sealed fiber and viscose fiber are both obtained by purchase;

[0013] S2, beating, putting one or more plant fibers into a first pulp pool according to a preset ratio, and beating with water to obtain a first slurry, and putting heat-sealed fibers, viscose fibers and plant fibers into a second pulp pool according to a preset ratio, and beating with water to obtain a second slurry;

[0014] S3, slurry preparation, adding the diluted wet strength agent into the first slurry;

[0015] S4, papermaking, diluting the first slurry and the second slurry to a concentration of 0.02 to 0.06%, respectively, and performing screen forming, pressing, cylinder drying, high-temperature shaping, and slitting, respectively, to obtain a semi-finished tea filter paper;

[0016] S5, bending and forming, using a paper stretching mold to form the tea filter paper semi-finished product into a continuous bending state;

[0017] S6, hot pressing, using a hot press machine to perform local hot pressing on the semi-finished tea filter paper to form an adhesion area;

[0018] S7, winding, cutting and packaging.

[0019] The present invention also discloses a tea filter bag, which is formed by hot pressing and punching two pieces of tea filter paper that are not easy to break. The heat-sealing layers on the two tea filter papers are close to each other, and the hot pressing area is in a square frame or annular shape. Hot pressing can make the two heat-sealing layers in the hot pressing area melt and adhere to each other to form a sealed edge. The width of the sealed edge is 3 to 5 mm, and then the outer contour of the sealed edge is cut out through a punching process to obtain the tea filter bag.

[0020] The tea filter bag made of tea filter paper that is not easy to break, when in use, even if the contents inside swell due to water immersion, causing the internal space of the entire filter bag to become compact, the tea filter paper will begin to generate internal stress. Since the size of the adhesion area on the tea filter paper is smaller than the edge seal, the tensile strength of the adhesion area is significantly smaller than the tensile strength of the edge seal, which will cause the adhesion area to tear first, and then the folded part cannot be maintained. After the folded part is pulled open, the surface area of ​​the tea filter bag can be expanded, thereby obtaining a capacity expansion effect. Therefore, the invention is not prone to the situation where the edge seal area of ​​the bag body breaks. The size of the adhesion area is small, even if the adhesion area is torn to cause the filter paper to break, the rupture is also small, and the tea is not easy to leak out.

[0021] Therefore, compared with the prior art, the present invention has the following characteristics: 1. The tea filter paper is processed through a continuous folding process, and the folding effect is maintained by setting an adhesion area. When the tea filter paper is taut, the adhesion area is easily broken, so that the folded tea filter paper is flattened, the surface area is significantly increased, and the taut state is released. In this way, when the tea filter paper is made into a tea bag, the seal is not prone to cracking; 2. The proportion of artificial synthetic substances in the present invention is relatively low, and it is relatively easier to degrade. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Attached Figure 1 is a schematic diagram of the shielding shape of Example 1;

[0023] Attached Figure 2 is a top view of Example 1;

[0024] Attached Figure 3 It is a schematic diagram of the shielding shape of Example 2. DETAILED DESCRIPTION

[0025] The technical solution of the present invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0027] Example 1: See Figure 1 and Figure 2, a tea filter paper that is not easy to break, the tea filter paper is composed of a fiber filter paper layer 10 and a heat sealing layer 20, the mass of the heat sealing layer accounts for 25wt%, the fiber filter paper layer is obtained by making paper from plant fibers, and the heat sealing layer is obtained by making paper from a mixture of heat sealing fibers, viscose fibers and plant fibers. The tea filter paper is continuously folded and flattened, and the folded parts on the tea filter paper will form a strip-shaped overlapping area with a width of 3.5mm. The tea filter paper is also locally hot-pressed, so that adjacent heat sealing layers in the overlapping area partially form an adhesion area 30, and the adhesion area is in a dot shape with a width of about 1.5mm, which has the effect of fixing the folded state.

[0028] See Figure 1 The folding shape of the tea filter paper is a continuous "Ω" shape.

[0029] The area of ​​the adhesion zone accounts for 3.5% of the area of ​​the tea filter paper in the shielding state.

[0030] The heat-sealing layer is composed of the following fibers by mass percentage: 42% heat-sealing fiber, 45% viscose fiber, and 13% plant fiber, wherein the heat-sealing fiber is PP;

[0031] The plant fiber is selected as 70% of wood pulp and 30% of hemp pulp, and the beating degree of the plant fiber is 26°SR.

[0032] Example 2: See Figure 3 The difference between the embodiment 1 and the embodiment 1 is that the folded shape of the tea filter paper is a continuous "N" shape.

[0033] This embodiment also discloses a method for preparing tea filter paper that is not easy to break, comprising the following steps: S1, preparing raw materials, wherein plant fiber can be purchased or prepared, and the preparation process is an existing conventional preparation process, which will not be described in detail here, and heat-sealed fiber and viscose fiber are both obtained by purchase;

[0034] S2, beating, putting one or more plant fibers into a first pulp pool according to a preset ratio, and beating with water to obtain a first slurry, and putting heat-sealed fibers, viscose fibers and plant fibers into a second pulp pool according to a preset ratio, and beating with water to obtain a second slurry;

[0035] S3, slurry preparation, adding the diluted wet strength agent into the first slurry;

[0036] S4, papermaking, diluting the first slurry and the second slurry to a concentration of 0.04% respectively, and performing screen forming, pressing, cylinder drying, high-temperature shaping, and slitting respectively to obtain a semi-finished tea filter paper;

[0037] S5, bending and forming, using a paper stretching mold to form the tea filter paper semi-finished product into a continuous bending state;

[0038] S6, hot pressing, using a hot press machine to perform local hot pressing on the semi-finished tea filter paper to form an adhesion area;

[0039] S7, winding, cutting and packaging.

[0040] The present embodiment also discloses a tea filter bag, which is formed by hot pressing and punching two pieces of tea filter paper that are not easy to break. The heat-sealing layers on the two tea filter papers are close to each other, and the hot pressing area is in the shape of a square frame or a circular ring. The hot pressing can make the two heat-sealing layers in the hot pressing area melt and adhere to each other to form a sealed edge. The width of the sealed edge is 4 mm, and then the outer contour of the sealed edge is cut out through a punching process to obtain the tea filter bag.

[0041] The present invention can be modified in various ways which are obvious to those skilled in the art, and such modifications are not considered to depart from the scope of the present invention. All such modifications which are obvious to those skilled in the art are intended to be included within the scope of the present claims.

Claims

1. A tea filter paper that is not easy to break, the tea filter paper is composed of a fiber filter paper layer and a heat sealing layer, characterized in that: The mass proportion of the heat sealing layer is 20 to 35wt%, the fiber filter paper layer is obtained by making paper from plant fibers, the heat sealing layer is obtained by making paper from a mixture of heat sealing fibers, viscose fibers and plant fibers, the tea filter paper is continuously folded and flattened, the folded parts on the tea filter paper will form strip-shaped overlapping areas, and the tea filter paper is also locally hot-pressed so that adjacent heat sealing layers in the overlapping area partially form an adhesion area.

2. The tea filter paper that is not easy to break according to claim 1, characterized in that: The folded shape of the tea filter paper is a continuous "Ω" shape or a continuous "N" shape.

3. The tea filter paper that is not easy to break according to claim 1, characterized in that: The width of the overlap region is between 3 and 5 mm.

4. The tea filter paper that is not easy to break according to claim 1, characterized in that: The adhesion area is in the form of dots or lines, and its width is 1 to 2 mm.

5. The tea filter paper that is not easy to break according to claim 4, characterized in that: The area of ​​the adhesion zone accounts for no more than 5% of the area of ​​the tea filter paper in the shielding state.

6. The tea filter paper that is not easy to break according to claim 1, characterized in that: The heat sealing layer is composed of the following fibers by mass percentage: 30 to 50% heat sealing fiber, 40 to 50% viscose fiber, and 5 to 20% plant fiber, wherein the heat sealing fiber is one or a combination of two of PP and ES; the selection range of plant fiber: one or more combinations of log pulp, hemp pulp, and bamboo pulp, and the beating degree of the plant fiber is 22 to 28°SR.

7. A method for preparing tea filter paper that is not easy to break, comprising the following steps: S1, preparing raw materials, wherein plant fibers can be purchased or prepared, and heat-sealed fibers and viscose fibers are obtained through purchase; S2, beating, putting one or more plant fibers into a first pulp pool according to a preset ratio, and beating with water to obtain a first slurry, and putting heat-sealed fibers, viscose fibers and plant fibers into a second pulp pool according to a preset ratio, and beating with water to obtain a second slurry; S3, slurry preparation, adding the diluted wet strength agent into the first slurry; S4, papermaking, diluting the first slurry and the second slurry to a concentration of 0.02 to 0.06%, respectively, and performing screen forming, pressing, cylinder drying, high-temperature shaping, and slitting, respectively, to obtain a semi-finished tea filter paper; S5, bending and forming, using a paper stretching mold to form the tea filter paper semi-finished product into a continuous bending state; S6, hot pressing, using a hot press machine to perform local hot pressing on the semi-finished tea filter paper to form an adhesion area; S7, winding, cutting and packaging.

8. A tea filter bag, which is formed by hot pressing and punching two pieces of tea filter paper, characterized in that: The tea filter paper is the tea filter paper that is not easily broken as described in any one of claims 1 to 5.

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