CN111155355A

CN111155355A - Heat-sealing type tea filter paper

Info

Publication number: CN111155355A
Application number: CN201911339959.7A
Authority: CN
Inventors: 余才广; 王贤炉; 朱春树
Original assignee: Zhejiang Tongchuang New Material Technology Co Ltd
Current assignee: Zhejiang Chenlong special materials Co.,Ltd.
Priority date: 2019-12-23
Filing date: 2019-12-23
Publication date: 2020-05-15

Abstract

The invention discloses heat-sealing type tea filter paper, belongs to the field of paper for tea filter bags, and particularly relates to heat-sealing type tea filter paper. The existing heat-seal filter paper is mostly heat-sealed by fibers made of chemical raw materials, which can cause harm to human health and environmental health. In the aspect of process, chemical raw material fibers are difficult to disperse in the process of making paper pulp due to the poor water-cleaning property of the chemical raw material fibers, so that the difficulty is increased for making filter paper. The filter paper is divided into an upper layer and a lower layer, wherein the upper layer is made of all wood pulp fibers, the lower layer is made of a mixture of corn fibers and wood pulp fibers, the upper layer accounts for 30-80% of the whole filter paper, and in the lower layer, the corn fibers account for 20-80% of the mixture of the lower layer. The filter paper is made of a full-natural extract, is environment-friendly and healthy, has good material uniformity and easy mixing, and simultaneously obtains good use functional performances such as tensile strength, air permeability, heat-seal strength and the like of the paper by adjusting the proportion of the filter paper through the interaction between fibers.

Description

Heat-sealing type tea filter paper

Technical Field

The invention belongs to the field of paper for tea filter bags, and particularly relates to heat-seal type tea filter paper.

Background

Along with the continuous improvement of the living standard of people, bagged tea and products are more and more favored by consumers, and the bagged tea and the products are very popular in European and American countries because the bagged tea is convenient and sanitary to drink, the active ingredients in the tea are quickly dissolved out, and the tea is accurately quantified when being drunk. More than 80% of tea leaves in Canada, Italy, Netherlands, France and other countries are consumed in the form of tea bags, and the consumption rate in British and America is about 80%. The production of tea bags in China starts in the 60 th of the 20 th century, the tea bags produced in the current year are about 3 million tons, which account for about 5 percent of the total output of tea leaves in China, and the consumption of domestic tea bags accounts for about 2 percent of the total sales of tea leaves. The tea filter paper is a common filter paper and is used for filtering tea by bagged tea.

The tea filter paper is divided into heat-sealing type and non-heat-sealing type, and the non-heat-sealing type tea filter paper is filter paper for inner packaging of tea bags, and can be used for packaging bagged tea, and can also be used for preparing filter bags of Chinese patent medicines and health-care drinks and the like. The filter bag made of the tea powder does not break when being brewed by hot water, and can quickly leach out tea juice without leakage of tea dust. The raw material of the non-heat-sealing type tea filter paper completely adopts plant fiber, the paper is uniform, soft and moderate, the dry and wet strength is high, the water filtering speed is high, and the non-heat-sealing type tea filter paper is non-toxic and free of peculiar smell, and is a green and environment-friendly product which completely meets the food sanitation requirement. The non-heat-sealing type tea filter paper is mostly sealed by a stapler, the cost of sealing materials is high, and the taste of the tea is influenced by the peculiar smell brought by metal during brewing.

With the improvement of the production efficiency of tea bags, heat-sealing type tea filter paper is becoming popular with the convenient and cheap sealing technology. Because the principle of heat sealing is to seal the tea bag by adhesion and deformation of materials at high temperature, the basic difference between the heat-sealing tea bag and the non-heat-sealing tea bag is whether heat-sealing materials are used or not. The heat-sealing material is made into fiber, and is mixed with paper pulp to make paper, then the paper is heat-set, i.e. the heat-sealing fiber is contracted into point-like material at high temperature, then when the tea bag is packed, these point-like heat-sealing materials are heated, and adhered with heat-sealing fiber of another surface, so that the paper can be sealed, so that the tea bag can be formed.

In the traditional manufacturing process of the heat-seal tea bag filter paper, the edible plastic fiber with strong thermoplasticity is the mainstream heat-seal fiber. For example, patent CN104233906B discloses a tea filter paper using polypropylene (PP) or Polyethylene (PE) fibers as heat sealing material. However, the use of such filter paper presents a great risk. First, plastic-based heat-seal type tea filter paper can pose health risks when brewed in hot water. Environmental authoritative journal Environmental tests of trees of microorganisms and nanoparticies of in Technology, published 25.9.2019, disclose the surprising fact that Plastic-based Tea bags would Release 116 billion of micro-plastics in one brew. The micro-plastics are difficult to degrade and digest in human bodies, and can bring about cancer hidden trouble after long-term accumulation. Secondly, the filter bag made of the material is extremely difficult to degrade in natural environment due to the use of chemical materials, and a large amount of non-degradable garbage can be produced when the PP or PE is applied to the tea filter bag which is consumed in large amount in daily life, so that great pressure is caused to the environment. Thirdly, garbage classification is being carried out in most regions, in the national garbage classification standard, the PP and PE fiber tea bags are classified into other garbage for landfill, and the tea leaves belong to perishable garbage and need to be separately thrown in, so that extra troubles are produced for consumers. Fourthly, because the surface of the PP fiber is free of hydroxyl and is not hydrophilic, the dispersion of the PP fiber is a problem which is very difficult to solve in the papermaking industry taking water as a medium. Fifth, there is no hydroxyl group, another problem brought is that there is not any binding force between the fiber and the wood pulp fiber, and the direct problem brought is that the strength of the finished paper is poor and the requirement of the high-speed tea packaging machine can not be met under the condition that the air permeability meets the basic requirement, which affects the manufacturing efficiency.

Disclosure of Invention

The invention aims to provide environment-friendly and healthy heat-sealing type tea filter paper made of materials, and the heat-sealing type tea filter paper solves the industrial problems that paper pulp is not easy to disperse and the strength of finished paper is low in the processing process of the filter paper.

In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:

the utility model provides a heat-seal type tealeaves filter paper, this filter paper divide into about two-layer, and the upper strata is full wood pulp fiber, and the lower floor is corn fiber and wood pulp fiber's mixture, by weight percent, the upper strata accounts for 30 ~ 80% of filter paper, the corn fiber of lower floor accounts for 20% ~ 80% of lower floor's mixture.

The inventors of the present invention found that: when the wood pulp fiber layer accounts for less than 30 percent of the total weight of the filter paper, the strength of the filter paper is affected, and the heat sealing of subsequent working sections and the sealing after packaging tea leaves and the like are not facilitated; if the percentage of the corn fiber is higher than 80%, the heat sealing strength is low, and if the corn fiber is packed into a tea bag, the sealing is not firm, and the bag is scattered.

Further, if the proportion of the corn fiber in the lower layer is lower than 20%, the corn fiber is used in too little amount, so that the heat sealing strength is low, and if the corn fiber is packed into a tea bag, the sealing is not firm, and the bag is scattered; if the proportion of the corn fiber in the lower layer is higher than 80%, the binding force is weak because the surface of the corn fiber has no hydrogen bond, and the mixture in the lower layer is difficult to be uniform paper; in addition, in the production process, too much corn fiber falls off from the paper surface, which not only influences the working environment, but also causes waste.

Further preferably, the thickness of the corn fiber is 1.0-5.0 denier.

The thickness of the corn fiber is between 1.0 and 5.0 denier and is lower than 1.0 denier, and the price of the heat-sealing fiber is too high, so that the popularization and the application are not facilitated; above 5.0 denier, too coarse fiber, too large spot after heat shrinkage, easy blocking of pores, not good for substance exudation.

More preferably, the upper layer accounts for 60% of the filter paper, and the corn fiber of the lower layer accounts for 50% -80% of the mixture of the lower layer.

Further preferably, the thickness of the corn fiber is 1.0-3.0 denier.

Further preferably, the upper layer accounts for 60% of the filter paper, the corn fiber of the lower layer accounts for 50% of the mixture of the lower layer, and the thickness of the corn fiber is 1.0-1.2 denier.

In some embodiments of the invention, the upper layer comprises 60% of the filter paper, the lower layer comprises 50% of the mixture of the lower layer and the corn fiber has a coarseness of 1.0-1.2 denier, and the filter paper has significant and consistent improvements in tensile strength, air permeability, and heat seal strength compared to the combination of PP fiber and wood pulp fiber.

Further preferably, any one layer of the filter paper is suitable for use in a fourdrinier, cylinder or inclined wire former.

The former used in the invention can be a fourdrinier wire, a cylinder mould or a tilted wire, any layer can be any former, and the selection of the former does not influence the content of the invention.

Further preferably, the heat-setting temperature of the filter paper heat-sealing is 170 ℃.

After the body paper is manufactured, a heat setting procedure is required; the core content of the heat setting process is to make the surface temperature of the paper reach the melting point temperature of the corn fiber. When the melting point of the corn fiber is 170 ℃, the surface temperature of the paper reaches 170 ℃, and the corn fiber shrinks into points which are adhered to the paper surface. When the filter paper is used for sealing, the corn fiber points on the two surfaces are mutually bonded, so that the purpose of sealing is achieved.

According to the technical scheme, the whole wood pulp fiber and the corn fiber are mixed, and the corn fiber and the wood pulp fiber have good water solubility, so that the problem that the chemical fiber is difficult to disperse is solved, uniform mixing can be formed during mixing, and the uniformity of the filter paper is ensured. The pulp is uniformly mixed, so that the pulp is not interfered by the forming shape during forming, and the pulp forming machine can be suitable for forming machines of various types. Another benefit of homogeneous mixing is that wood pulp fiber and corn fiber can fully contact and react to form firmer bonding force, making paper intensity firmer.

The technical scheme of the invention is that corn fiber and wood pulp are mixed, and the thermoplastic property of the corn fiber is used for sealing, thus completing the packaging of tea bags and ensuring that the tea bags are not leaked. The wood pulp fibers and the corn fibers adopted by the invention are plant fibers, are easy to degrade, have small environmental impact, are natural in raw materials, and have small impact on human health. The corn fiber with the thermoplastic sealing function is prepared from lactic acid prepared from starch, belongs to a fiber which completes natural circulation and has biodegradability, and has the following chemical formula:

the fiber does not use chemical raw materials such as petroleum and the like, and the waste of the fiber can be decomposed into carbon dioxide and water under the action of microorganisms in soil and seawater, so that the earth environment is not polluted. Since the starting material of the fiber is starch, the cycle time for regeneration is short, about one to two years, and the carbon dioxide produced by the fiber can be reduced to the atmospheric level by plant photosynthesis. PLA fibers burn with little nitric oxide, and the heat of combustion is about one third of that of polyethylene and polypropylene.

The invention provides environment-friendly heat-seal filter paper which can be used in all water bath environments such as tea filter paper, health product packages, seasoning packets, dry filter paper and the like and is an environment-friendly product which can be used by consumers at ease; the synergistic effect of the paper components enables the paper to have good tensile strength, air permeability and heat-sealing strength, and the functionality of the paper is ensured. Specific functional experimental data are presented in the data comparison of the specific examples and comparative examples below.

Detailed Description

The present invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.

The heat-sealing filter paper can be tea filter paper and dry filter paper according to application, and the tea filter paper can be used for filtering and packaging in health care industry (such as weight-reducing tea) and packaging of seasoning packets in food industry, such as thirteen spices and the like. The present invention is described by taking 16.5g of tea leaf filter paper as an example. The former uses a double-layer inclined net to illustrate the invention.

Reference example 1, the bottom layer was a mixed layer consisting of wood pulp and PP fibers of 3 denier thick and 3mm long, wherein the PP fibers accounted for 50%; the top layer is a wood pulp layer and consists of whole wood pulp, the beating degree of the wood pulp is 180SR, and the top layer accounts for 60 percent. The paper is made by a double-layer inclined net, and the quantitative, tensile strength, air permeability, heat sealing strength and the like of the paper are detected.

Example 1, the bottom layer is a mixed layer, which consists of wood pulp and corn fiber, the corn fiber is 3.0 denier thick and 3mm long, wherein the corn fiber accounts for 50 percent; the top layer is a wood pulp layer and consists of whole wood pulp, the beating degree of the wood pulp is 180SR, and the top layer accounts for 60 percent. The paper is made by a double-layer inclined net, and the quantitative, tensile strength, air permeability, heat sealing strength and the like of the paper are detected.

Example 2, the bottom layer is a mixed layer, which is composed of wood pulp and corn fiber, the corn fiber is 3.0 denier thick and 3mm long, wherein the corn fiber accounts for 50 percent; the top layer is a wood pulp layer and consists of whole wood pulp, the beating degree of the wood pulp is 180SR, and the top layer accounts for 30 percent. The paper is made by a double-layer inclined net, and the quantitative, tensile strength, air permeability, heat sealing strength and the like of the paper are detected.

Example 3, the bottom layer is a mixed layer, which consists of wood pulp and corn fiber, the corn fiber is 3.0 denier thick and 3mm long, wherein the corn fiber accounts for 50 percent; the top layer is a wood pulp layer and consists of whole wood pulp, the beating degree of the wood pulp is 180SR, and the top layer accounts for 80%. The paper is made by a double-layer inclined net, and the quantitative, tensile strength, air permeability, heat sealing strength and the like of the paper are detected.

Example 4, the bottom layer is a mixed layer, consisting of wood pulp and corn fiber, the corn fiber is 3.0 denier thick and 3mm long, wherein the corn fiber accounts for 20 percent; the top layer is a wood pulp layer and consists of whole wood pulp, the beating degree of the wood pulp is 180SR, and the top layer accounts for 60 percent. The paper is made by a double-layer inclined net, and the quantitative, tensile strength, air permeability, heat sealing strength and the like of the paper are detected.

Example 5, the bottom layer was a blend layer consisting of wood pulp and corn fiber, the corn fiber being 3.0 denier thick and 3mm long, wherein the corn fiber accounted for 80%; the top layer is a wood pulp layer and consists of whole wood pulp, the beating degree of the wood pulp is 180SR, and the top layer accounts for 60 percent. The paper is made by a double-layer inclined net, and the quantitative, tensile strength, air permeability, heat sealing strength and the like of the paper are detected.

Example 6, the bottom layer was a blend layer consisting of wood pulp and corn fiber, the corn fiber being 1.0 denier thick and 3mm long, wherein the corn fiber accounted for 50%; the top layer is a wood pulp layer and consists of whole wood pulp, the beating degree of the wood pulp is 180SR, and the top layer accounts for 60 percent. The paper is made by a double-layer inclined net, and the quantitative, tensile strength, air permeability, heat sealing strength and the like of the paper are detected.

Example 7, the bottom layer was a blend layer consisting of wood pulp and corn fiber, the corn fiber being 5.0 denier thick and 3mm long, wherein the corn fiber accounted for 50%; the top layer is a wood pulp layer and consists of whole wood pulp, the beating degree of the wood pulp is 180SR, and the top layer accounts for 60 percent. The paper is made by a double-layer inclined net, and the quantitative, tensile strength, air permeability, heat sealing strength and the like of the paper are detected.

Example 8, the bottom layer is a mixed layer, consisting of wood pulp and corn fiber, the corn fiber is 1.2 denier thick and 3mm long, wherein the corn fiber accounts for 50%; the top layer is a wood pulp layer and consists of whole wood pulp, the beating degree of the wood pulp is 180SR, and the top layer accounts for 60 percent. The paper is made by a double-layer inclined net, and the quantitative, tensile strength, air permeability, heat sealing strength and the like of the paper are detected.

The above test data are shown in the following table:

	quantitative (g/m2)	Tensile Strength (kn/m)	Air permeability (CU)	Heat sealing Strength (kn/m)
					Ginseng radix (Panax ginseng C.A. Meyer)	16.5	0.58	12500	0.17
Example 1	16.4	0.89	13100	0.16
					Example 2	16.3	0.39	11500 (double-layer)	0.22
Example 3	16.5	1.03	3580	0.05
					Example 4	16.6	0.95	9800	0.04
Example 5	16.5	0.74	14300	0.34
					Example 6	16.9	0.97	13800	0.19
Example 7	16.8	0.79	10800	0.19
					Fruit 8	16.5	0.94	14100	0.16

Claims

1. The heat-sealing type tea filter paper is characterized in that the filter paper is divided into an upper layer and a lower layer, the upper layer is made of all wood pulp fibers, the lower layer is made of a mixture of corn fibers and wood pulp fibers, and the upper layer accounts for 30-80% of the filter paper and the corn fibers of the lower layer account for 20% -80% of the mixture of the lower layer in percentage by weight.

2. The filter paper as recited in claim 1, wherein the corn fiber thickness is 1.0-5.0 denier.

3. The filter paper of claim 1, wherein the upper layer comprises 60% of the filter paper, and the lower layer comprises 50% to 80% of the lower layer mixture.

4. The filter paper as recited in claim 3, wherein the corn fiber thickness is 1.0-3.0 denier.

5. The filter paper as claimed in claim 4, wherein the upper layer accounts for 60% of the filter paper, the lower layer of corn fiber accounts for 50% of the mixture of the lower layer, and the thickness of the corn fiber is 1.0-1.2 denier.

6. The filter paper according to claim 1, wherein any one layer of the filter paper is suitable for use in a fourdrinier, cylinder or inclined wire former.

7. The filter paper as recited in claim 1, wherein the heat-seal heat-set temperature of the filter paper is 170 degrees celsius.