CN116856201B - Heat-sealing tea filter paper, production method and application - Google Patents
Heat-sealing tea filter paper, production method and application Download PDFInfo
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- CN116856201B CN116856201B CN202310510204.9A CN202310510204A CN116856201B CN 116856201 B CN116856201 B CN 116856201B CN 202310510204 A CN202310510204 A CN 202310510204A CN 116856201 B CN116856201 B CN 116856201B
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/08—Filter paper
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
- B65D85/70—Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for
- B65D85/804—Disposable containers or packages with contents which are mixed, infused or dissolved in situ, i.e. without having been previously removed from the package
- B65D85/808—Disposable containers or packages with contents which are mixed, infused or dissolved in situ, i.e. without having been previously removed from the package for immersion in the liquid to release part or all of their contents, e.g. tea bags
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/80—Paper comprising more than one coating
- D21H19/84—Paper comprising more than one coating on both sides of the substrate
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/18—Reinforcing agents
- D21H21/20—Wet strength agents
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/18—Paper- or board-based structures for surface covering
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
- Wrappers (AREA)
- Packages (AREA)
Abstract
The invention belongs to the technical field of special paper new materials, and particularly relates to heat-sealing tea filter paper, a production method thereof and a teabag. The heat-seal tea filter paper comprises base paper and a heat-bonding coating layer, wherein the base paper comprises the following raw materials in percentage by mass: softwood pulp: 30-100%; hardwood pulp: 0-60%; 0-60% of bamboo pulp or 0-30% of hemp pulp; the basis weight of the base paper is 10-25 g/m 2 The tightness is low and is less than or equal to 0.40g/m 3 The thickness is controlled to be 20-80 mu m, and the air permeability is 4000-50000CU; the hot-bonding coating layer is formed by drying food-grade thermoplastic polyolefin or polylactic acid emulsion coated on one side or two sides of base paper, and the mass percentage of the hot-bonding coating layer on the whole piece of filter paper is 20-60%. The heat-seal tea filter paper has the advantages of good comprehensive performance, simple base paper manufacturing method, convenient coating of the heat-seal coating layer, strong production adaptability, easy control of various indexes of the paper, convenient production management, more stable various indexes of the paper and lower production cost.
Description
Technical Field
The invention belongs to the technical field of special paper new materials, and particularly relates to novel heat-sealing tea filter paper, a production method thereof and a teabag.
Background
Tea leaves are native in china, and the 9 th century of the male element is transmitted into japan, and the 19 th century is transmitted into southeast asia, south asia, europe and other worldwide places. In eastern countries such as China and Japan, tea leaves are generally placed into a teacup or a teapot to be directly soaked or decocted by hot water, and the leaching liquid is used for drinking. However, in Europe and south Asia, tea leaves are generally dried and ground into tea dust, and the tea dust is packaged in small bags, and the small bags of tea are placed into a teacup or a teapot to be soaked or decocted with hot water and then drunk. European tea powder is also favored to be added with various flavors and fragrances to prepare teabags with various tastes. The production of the teabag mainly involves three production elements: tea raw material, packaging material and teabag package forming machine.
The packaging material can be selected from mesh cloth and tea filter paper made of chemical fibers such as polyester, and the tea filter paper is generally selected as the packaging material of the teabag because the chemical fibers such as polyester are difficult to degrade, and the tea filter paper is divided into heat-seal type tea filter paper and non-heat-seal type tea filter paper according to the sealing mode of the teabag and the different manufacturing materials. The heat-sealing tea bag forming machine is simple in machine manufacturing, low in cost and easy to popularize, and especially, the heat-sealing tea filter paper is generally selected in our domestic marketMaking into teabag. The heat-seal tea filter paper contains a certain amount of heat-seal fibers, and the sealing of the tea bag can be realized by bonding two layers of paper containing the heat-seal fibers in a high-temperature roller hot-pressing mode, so that the sealing is sealed. The heat-seal tea filter paper is added with part of heat-melting fibers such as PP fibers, PE fibers, ES fibers, PLA fibers and the like, and has relatively high ration, and is generally more than or equal to 16.5g/m 2 . At present, the heat-sealing tea filter paper produced at home and abroad is manufactured by two layers, the two layers are completely different in structure, one layer is a base layer (or called no heat sealing layer), and the other layer is a heat sealing layer, and the heat sealing layer is used for manufacturing a single-bag type tea bag. The production process of the heat-seal type tea filter paper comprises the following steps: the basic layer adopts softwood pulp, hardwood pulp and various hemp pulp as raw materials, and in the mass ratio of the paper, the mass ratio of the paper is generally controlled as follows: 60-80%; the heat sealing layer is made of a larger part of heat sealing fibers, and is additionally added with part of softwood pulp, hardwood pulp and various hemp pulp as raw materials, wherein the mass ratio of the heat sealing layer in the whole paper is as follows: 20-40%; the mass ratio of the heat-sealing fibers in the heat-sealing layer is as follows: 50-90%, and the rest is selected from wood pulp, various hemp pulp or the combination of the wood pulp and the hemp pulp, and the other steps of two-layer molding, squeezing, drying, coiling, slitting, packaging and the like are performed. The heat-seal tea filter paper produced by the combination has better paper strength, better heat-seal strength, better air permeability and better bulk, and also has better anti-end leakage performance.
In addition, a very special heat-sealing tea filter paper is used for manufacturing double-bag type tea bags, a small amount of heat-sealing fibers are added in a base layer of paper sheets, the heat-sealing paper is used on a very special tea bag machine, and the tea bag machine is produced by only one company worldwide, is complex to manufacture, has very high selling price and is rarely used in the market. The heat-sealing tea filter paper with the two layers of heat-sealing fibers cannot be used on the existing tea packaging machine for manufacturing single bags in the market, otherwise, the heat-sealing fibers contained on the base layer are bonded with the sealing pressing wheel through hot pressing at the sealing pressing wheel of the tea packaging machine, and normal production cannot be achieved.
Chinese patent (publication No. CN111172802A, publication No. 2020-05-19) discloses a lightweight green heat-sealing tea filter paper and a preparation method thereof: the filter paper comprises an outer heat sealing layer and an inner heat sealing layer, and is prepared by mixing wood pulp fibers and heat sealing fibers and papermaking, wherein the heat sealing fibers are modified polylactic acid fibers, the melting point is 125-145 ℃, and the additives added into the slurry are all green natural polymer additives, so that the filter paper has the characteristics of complete natural circulation and biological decomposition. The patent describes that the filter paper comprises an outer heat sealing layer and an inner heat sealing layer, obviously, the heat sealing tea filter paper is only suitable for manufacturing heat sealing type double-bag tea bags, and the use amount of the heat sealing tea filter paper in the market is small.
The Chinese patent (publication No. CN104233906A, publication No. 2014-12-24) discloses a preparation process of heat-seal tea filter paper: the filter paper of the invention adopts a two-layer structure, takes a wood pulp layer as an inner layer and a chemical fiber layer as an outer layer, and is formed by adopting two raw materials to respectively paper and then adopting heat setting for compounding. The patent uses two layers of base paper (one layer is a chemical fiber layer and the other layer is a wood pulp layer) to carry out composite shaping by adopting a compression roller to form composite paper, and only part of heat-seal fibers at the joint of the two layers of the composite paper are melted to generate viscosity to be bonded with the wood pulp of the other layer, so that the bonding force formed by fiber winding between the two layers formed by wet papermaking and the hydrogen bonding force between plant fibers are avoided. The composite paper formed by adopting the dry-method compression roller for hot pressing has poor binding force at the composite position of the two layers, and the prepared tea bag is soaked in boiling water, so that the peeling and layering between the chemical fiber layer and the wood pulp layer are very easy to form a bag breaking phenomenon. Such heat-sealed filter papers for making tea bags are not approved by the market.
The Chinese patent (publication No. CN101798773A, publication No. 2010-08-11) discloses a double-sided heat-seal filter paper for manufacturing double bags and a preparation method thereof, wherein the double-sided heat-seal filter paper consists of a main heat-seal layer and a secondary heat-seal layer, the paper of the main heat-seal cover contains polypropylene fibers, the addition of the polypropylene fibers is 20-50% of the total amount of the paper fibers of the main heat-seal surface, the paper of the secondary heat-seal cover contains polyethylene fibers or composite fibers containing the polyethylene fibers, and the addition of the polyethylene fibers or the polyethylene fibers is 10-40% of the total amount of the paper fibers of the secondary heat-seal surface; the preparation method of the double-sided heat-seal filter paper adopts an inclined wire paper machine for forming, wherein the upper layer adopts wood pulp mixed polypropylene fibers, the lower layer adopts wood pulp mixed polyethylene fibers or polyethylene-containing composite fibers, the upper layer and the lower layer are used for composite papermaking, and a drying tunnel type drying mode is adopted for shaping. The two layers of the product manufactured by the patent are heat-sealing layers, so that the heat-sealing type double-bag tea bag is obviously only suitable for manufacturing heat-sealing type double-bag tea bags, and the market dosage is small.
The Chinese patent (publication No. CN111155355A, publication No. 2020-05-15) discloses a heat-sealing tea filter paper, which is characterized in that the filter paper is manufactured by upper and lower layers, the upper layer is made of full wood pulp fiber, the lower layer is a mixture of corn fiber and wood pulp fiber, the upper layer accounts for 30-80% of the filter paper, and the corn fiber of the lower layer accounts for 20-80% of the mixture of the lower layer according to weight percentage.
The production modes of the heat-sealing type tea leaf filter paper in the patent of the invention all use two layers of paper making, and then the heat-sealing type tea leaf filter paper with a two-layer structure is formed by different combination modes.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide novel heat-sealing tea filter paper, which is prepared by coating food-grade thermoplastic polyolefin or polylactic acid emulsion on one side or both sides of base paper, and has the advantages of good comprehensive performance, simple base paper manufacturing method, convenient coating of a heat-bonding coating layer, strong production adaptability, easy control of various indexes of paper, convenient production management, more stable various indexes of paper and lower production cost.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the novel heat-seal tea leaf filter paper comprises base paper and a heat-bonding coating layer, wherein the base paper comprises the following raw materials in percentage by mass:
softwood pulp: 30-100%;
hardwood pulp: 0-60%;
0-60% of bamboo pulp or 0-30% of hemp pulp;
the basis weight of the base paper is 9.0-25 g/m 2 The tightness is less than or equal to 0.40g/m 3 The thickness is controlled to be 20-80 mu m, and the air permeability is 4000-50000CU; the hot-bonding coating layer is formed by drying food-grade thermoplastic polyolefin or polylactic acid emulsion coated on one side or two sides of base paper, and the mass percentage of the hot-bonding coating layer on the whole piece of filter paper is 20-60%; preferably 25-45%.
The invention adopts 100% vegetable fiber slurry to prepare single-layer base paper with specific performance through the procedures of pulping, fluffing, beating, streaming, forming and papermaking by adopting a layer of net part of a paper machine, squeezing, drying and the like, and the base paper is required to have a low ration of only 11-25g/m 2 The tightness is less than or equal to 0.40g/m 3 The thickness is controlled to 20-100 μm, the air permeability is good, the air permeability is controlled to 4000-50000CU, especially 11.5 g/m 2 The air permeability of the base paper is controlled to be 30000-40000 CU, the hydrophilicity is good, and the corresponding porosity is larger. Then coating a certain amount of thermoplastic polyolefin hydrocarbon or polylactic acid emulsion on one side or two sides of the base paper by any one or a combination of single-side coating, single-side spraying or single-side printing method, wherein the base paper is selected to have a low basis weight of only 11-25g/m 2 The tightness is less than or equal to 0.40g/m 3 The thickness is controlled to be 30-80 mu m, the air permeability is controlled to be 4000-50000CU, the hydrophilicity is good, the corresponding larger porosity is realized, one part of the thermoplastic polyolefin or polylactic acid emulsion coated on the base paper needs to be permeated into the base paper, the other larger part of the thermoplastic polyolefin or polylactic acid emulsion coated on the base paper stays on the surface of the base paper, the thermoplastic polyolefin or polylactic acid component coated on the base paper does not form a membranous layer, but is mainly adhered to the surface and the intersection point of single fiber, and the gaps in the base paper are still preserved, so that the air permeability of the filter paper is not influenced, and the filtering performance of the paper is not influenced. The base paper is made into a single-sided or double-sided base paper which contains a certain amount of thermoplastic polyolefin or polylactic acid component, and one or both sides of the base paper are formed into a novel heat-sealing tea filter paper with heat-sealing performance meeting standard and use requirements.
Preferably, a combination ofThe basis weight of the base paper is 11-15 g/m 2 The tightness is less than or equal to 0.40g/m 3 The thickness is controlled to be 30-50 mu m, and the air permeability is 20000-40000CU.
Preferably, the base paper raw materials comprise the following materials in percentage by mass:
100% of softwood pulp;
or 50-70% of softwood pulp and 30-50% of hardwood pulp;
or 70-90% of softwood pulp and 10-30% of hemp pulp;
Or 60-80% of softwood pulp and 20-40% of bamboo pulp.
Preferably, the base paper stock has a freeness of 20 to 30 0 SR, wet weight: not less than 6g.
Preferably, the base paper raw material further comprises 1.0-6.0% of a wet strength agent, and more preferably, 2.0-5.0% of the wet strength agent.
Preferably, the food grade thermoplastic polyolefin or polylactic acid emulsion has a solids content of 40-70% and a viscosity of 200-400mpa.s. For low basis weight and thickness base papers, such as base papers having basis weights as low as 11 g/m 2 The thickness is as low as 30 mu m, the air permeability is as high as 40000CU, the paper is very thin, the porosity of the paper is very high, if the solid content of the emulsion is too low and is lower than 40 percent, the viscosity is lower than 200 mPa.s, the emulsion coated on the surface of the base paper on one side can permeate from the coating surface very quickly, the emulsion can not stay on the surface of the paper, but permeates into the paper on the other side of the base paper on the other side, so that a better heat sealing effect cannot be achieved, and the non-heat sealing layer also contains higher thermoplastic polyolefin or polylactic acid components on the other side, so that a roll sticking phenomenon can be generated when the tea bag is manufactured. If the solid content of the selected emulsion is higher than 70%, the viscosity is higher than 400mPa.s, the emulsion is not easy to control during production and use, the phenomena of sticking rollers, blocking conveying pipelines and the like can be generated, meanwhile, the emulsion coated on the surface of the base paper on one side is not too permeable from the coating surface, and most of the emulsion stays on the surface of the paper, so that a layer of film is formed, the air permeability of the heat-seal tea filter paper is seriously influenced, and the filtering performance index of the filter paper is influenced.
Preferably, the thermoplastic polyolefin refers to one or more of polypropylene PP, polyethylene PE, nylon PA and EVA; preferably polypropylene PP or polyethylene PE.
Preferably, the heat-seal tea filter paper is the heat-seal tea filter paper required for manufacturing the single-bag heat-seal tea bag, and the mass ratio of the heat-seal coating layer to the whole paper is as follows: 20-50%; preferably, the mass ratio of the hot-adhesion coating layer on the whole paper is as follows: 25-40%;
or,
the heat-seal tea filter paper is used for manufacturing the heat-seal tea filter paper required by the double-bag heat-seal tea bag, the heat-seal coating layer comprises a main heat-seal layer and a secondary heat-seal layer which are respectively arranged on two sides of the base paper, and the mass ratio of the main heat-seal layer to the whole paper is as follows: 20-50% of the secondary heat sealing layer in the whole paper, wherein the mass ratio of the secondary heat sealing layer to the whole paper is as follows: 4-10%; preferably, the mass ratio of the main heat-sealing layer on the whole paper is as follows: 25-40% of the secondary heat sealing layer in the whole paper, wherein the mass ratio of the secondary heat sealing layer to the whole paper is as follows: 5-8%.
Preferably, the base paper is formed by a layer of net part of a paper machine, the paper machine can be a cylinder, inclined net, clamped net or long net paper machine, and preferably, the paper machine is a cylinder or inclined net paper machine; a certain amount of thermoplastic polyolefin or polylactic acid emulsion is coated on the surface of the base paper by any one or two of single-sided film transfer coating, single-sided spraying or single-sided intaglio printing methods on one or two sides of the base paper.
The invention further discloses a production method of the heat-seal tea filter paper, which comprises the following steps:
1) Wood pulp disintegration: respectively adding softwood pulp, hardwood pulp, bamboo pulp or hemp pulp into a pulper for disintegrating, and respectively storing;
2) Fluffing and pulping: respectively defibering and pulping after pulp is crushed and soaked, wherein the pulping concentration is controlled to be 4.0-6.0%, the pulping degree of all wood pulp is 15-40 DEG SR, and the wet weight is more than or equal to 4g; respectively placing the pulp into corresponding pulping tanks after the fluffing and pulping are completed;
3) Preparing slurry: the ground slurry is prepared in a slurry preparation tank according to a certain proportion, and then the wet strength agent is added in the slurry preparation tank for 1.0 to 6.0 percent, and the wet strength agent is diluted to the concentration of 0.8 to 2.0 percent and then added in the slurry preparation tank;
4) Manufacturing: diluting the prepared slurry to 0.02-0.06% concentration, pumping to a corresponding papermaking front tank, respectively screening by a pulp pump for forming, squeezing, and drying by a drying cylinder;
5) Coating thermoplastic polyolefin or polylactic acid emulsion: coating thermoplastic polyolefin or polylactic acid emulsion on one side or two sides of base paper according to the requirement by any one or more of single-side coating, single-side spraying or single-side gravure printing methods;
6) Drying, coiling, checking, slitting and packaging by a dryer or a drying tunnel.
Further, the invention also discloses a teabag, which comprises a packaging bag and tea dust; the tea dust is arranged in the packaging bag; the packaging bag is made of tea filter paper, and the tea filter paper adopts the heat-seal tea filter paper.
In summary, the invention has the beneficial effects that: the heat-seal tea filter paper has good comprehensive performance and has the following advantages:
1. the paper making method of the base paper is simple, only single-layer paper making is needed, the equipment investment is low, and the investment cost is low;
2. the production mode of coating the heat sealing material on the base paper has simple production equipment and low investment cost;
3. the base paper with the same performance can be used for producing the single-bag heat-seal tea filter paper and the double-bag heat-seal tea filter paper, and the base paper is only changed correspondingly when the heat-seal material is coated, so that the production adaptability is high;
4. the surface layer of the heat-sealing layer of the novel heat-sealing type tea filter paper (comprising the heat-sealing layer for manufacturing the single-bag heat-sealing tea filter paper and the main heat-sealing layer and the secondary heat-sealing layer for manufacturing the double-bag heat-sealing tea filter paper) is a layer of thermoplastic material containing 100% of polyolefin hydrocarbon or polylactic acid, so that the manufactured heat-sealing type tea bag has particularly good heat-sealing performance. The base paper below the surface layer of the heat-sealing surface also contains a part of thermoplastic materials containing polyolefin or polylactic acid components, the internal binding force of the heat-sealing filter paper is particularly good, and the prepared tea bag is not easy to break under the condition of long-time high-temperature decoction;
5. The novel heat-seal tea filter paper is simple to manufacture, various indexes of the paper are easy to control, production management is convenient, various indexes of the paper are more stable, and production cost is lower.
Drawings
Figure 1 is a heat seal tea filter paper required for making a single pouch heat seal tea bag.
Figure 2 is a heat seal tea filter paper required for making a double pouch heat seal tea bag.
Wherein: 1. the base layer, 2, the emulsion permeates the emulsion permeation layer formed by the base paper, 3, the surface layer formed after the emulsion is dried, 4, the thermal bonding layer formed by the emulsion permeation layer and the surface layer; 41. primary heat-seal layer, 42. Secondary heat-seal layer.
Detailed Description
The following examples are provided to further illustrate the practice of the invention, but are not intended to limit the scope of the invention.
The invention discloses novel heat-sealing tea filter paper, which comprises the following steps: crushing the sizing agent, fluffing and pulping, adding an auxiliary agent, preparing sizing agent, removing slag, forming on a net (making paper), squeezing, drying in the front process, coating heat sealing materials, shaping in the back process at high temperature, coiling, inspecting, cutting, packaging and the like. The base paper is formed by a layer of net part of a paper machine, and the paper machine is a cylinder or inclined net paper machine. A certain amount of thermoplastic polyolefin or polylactic acid hydrocarbon emulsion is coated on the surface of the base paper by any one or two of single-sided film transfer coating, single-sided spraying or single-sided intaglio printing methods on one or two sides of the base paper.
The heat-seal tea filter paper shown in fig. 1 comprises base paper and a heat-bonding coating layer, wherein a food-grade thermoplastic polyolefin or polylactic acid emulsion is coated and dried on one side of the base paper, the base paper part of the food-grade thermoplastic polyolefin or polylactic acid emulsion which does not permeate into the base paper forms a base layer 1, the base paper part which permeates into the base paper forms an emulsion-containing permeation layer 2, a surface layer 3 is further formed on the surface of the base paper, and the surface layer 3 and the emulsion-containing permeation layer 2 together form the heat-bonding coating layer 4.
The heat-seal tea filter paper is used for manufacturing a single-bag heat-seal tea bag and comprises base paper and a heat-bonding coating layer, wherein 100% plant fiber slurry for the base paper is subjected to pulping, fluffing, beating, streaming, forming paper making by adopting a layer of net part of a paper machine, squeezing and dryingDrying to obtain a single-layer base paper with specific properties, which has a low basis weight of 9.0-25 g/m 2 The tightness is less than or equal to 0.40g/m 3 The thickness is controlled to be 20-80 mu m, the air permeability is good, and the air permeability is controlled to be 4000-40000CU. The mass ratio of the hot-bonding coating layer on the whole piece of paper is as follows: 20-50%; preferably, the mass ratio of the hot-adhesion coating layer on the whole paper is as follows: 25-40%; the key indexes of the novel heat-sealing tea filter paper for manufacturing the single bag are as follows: quantification: 16.5-30.0g/m 2 Of these, the most conventional quantification is 16.5g/m 2 The indexes of the heat-seal tea filter paper are as follows: quantification: 16.5.+ -. 0.8g/m 2 Air permeability: gtoreq 15000 CU, tensile strength (longitudinal): 0.55kN/m or more, tensile strength (transverse direction): 0.20kN/m or more, wet strength (machine direction): not less than 0.15kN/m, heat sealing strength: not less than 0.090kN/m, water filtering time: the base layer has no heat sealing strength, and the filter paper with the structure is smoothly used on a single-bag heat sealing tea filter paper forming machine.
The heat-seal tea filter paper shown in fig. 2 comprises base paper and a heat-bonding coating layer, wherein food-grade thermoplastic polyolefin or polylactic acid emulsion is coated and dried on two sides of the base paper, the base paper part of the food-grade thermoplastic polyolefin or polylactic acid emulsion which does not permeate into the base paper forms a base layer 1, the base paper part which permeates into the base paper forms an emulsion-containing permeation layer 2, a surface layer 3 is further formed on the surface of the base paper, the surface layer 3 on one side of the base layer 1 and the emulsion-containing permeation layer 2 form a main heat-seal layer 41 together, and the surface layer 3 on the other side of the base layer 1 and the emulsion-containing permeation layer 2 form a secondary heat-seal layer 42 together.
The heat-sealing tea filter paper is a novel heat-sealing tea filter paper for making double bags, and comprises base paper and a heat-bonding coating layer, wherein the base paper is made of 100% plant fiber slurry through pulping, fluffing, beating, streaming, forming paper making by adopting a layer of net part of a paper machine, and then squeezing, drying and other working procedures to prepare the single-layer base paper with specific performance, and the base paper has the requirement of low ration of only 9.0-25 g/m 2 The tightness is less than or equal to 0.40g/m 3 The thickness is controlled to be 20-80 mu m, the air permeability is good, and the air permeability is controlled to be 4000-40000CU. The heat-bonding coating layer consists of a main heat-sealing layer and a secondary heat-sealing layer which are respectively arranged on two sides of the base paper, and the main heat-sealing layer is arranged on the whole sheetThe mass ratio of the paper is as follows: 20-50% of the secondary heat sealing layer in the whole paper, wherein the mass ratio of the secondary heat sealing layer to the whole paper is as follows: 4-10%; preferably, the mass ratio of the main heat-sealing layer on the whole paper is as follows: 25-40% of the secondary heat sealing layer in the whole paper, wherein the mass ratio of the secondary heat sealing layer to the whole paper is as follows: 5-8%. Of which the most conventional quantification is 16.5g/m 2 The indexes of the heat-seal tea filter paper are as follows: quantification: 16.0.+ -. 0.8g/m 2 Air permeability: gtoreq 15000 CU, tensile strength (longitudinal): 0.55kN/m or more, tensile strength (transverse direction): more than or equal to 0.20kN/m 2 Wet strength (machine direction): not less than 0.15kN/m, and the heat sealing strength of the main heat sealing surface: not less than 0.090kN/m, water filtering time: less than or equal to 2s, and the heat sealing strength of the secondary heat sealing surface: the filter paper with the structure is smoothly used on a double-bag heat-seal tea filter paper forming machine from 0.020 to 0.050 kN/m.
The invention is further illustrated by the following specific examples.
Example 1 a novel heat-seal tea filter paper: (for making Single bag Heat sealed tea bag)
1) The slurry ratio is as follows: the plant fiber is prepared by respectively adding 100% softwood pulp into a pulper for disintegrating;
2) Fluffing and pulping: pulp slurry is disintegrated and soaked, fluffed and pulped, and the pulp grinding concentration is controlled to be 4.0-6.0%; the beating degree of the slurry is controlled as follows: 20-23 DEG SR, wet weight: 7g or more. After fluffing and pulping, putting the pulp into a corresponding pulping pool;
3) Preparing slurry: respectively placing the ground pulp into corresponding pulp mixing tanks, adding wet strength agent, and diluting to 0.8-1.0%; wet strength agent addition: 2.0%;
4) Manufacturing: diluting the prepared slurry to 0.02-0.03% concentration, pumping the slurry into a papermaking pond, forming a layer of slurry by a pulp flushing pump on an inclined wire, and then squeezing and drying the slurry by a drying cylinder; the base paper is quantitatively controlled at 12-13g/m 2 The air permeability of the base paper is controlled to be 20000-30000CU;
5) Coating a heat sealing material: coating PP emulsion on one side of base paper in a single-side film transfer coating mode, wherein the concentration of the PP emulsion is as follows: 50% of a viscosity of 220 mPa.s, and a mass ratio of the hot-adhesive coating layer in the whole paper is as follows: 25%;
6) And (3) drying: shaping at a high temperature drying channel and drying by a drying cylinder;
7) Coiling, checking, cutting and packaging.
The detection results are shown in the attached table.
Example 2 a novel heat seal tea filter paper: (for making Single bag Heat sealed tea bag)
1) The slurry ratio is as follows: the plant fiber is selected from 55% of softwood pulp and 45% of hardwood pulp, and the pulp is respectively added into a pulper for disintegrating;
2) Fluffing and pulping: pulp slurry is disintegrated and soaked, fluffed and pulped, and the pulp grinding concentration is controlled to be 4.0-6.0%; the beating degree of the slurry is controlled as follows: 23-25 ° SR, wet weight: not less than 6g. After fluffing and pulping, putting the pulp into a corresponding pulping pool;
3) Preparing slurry: respectively placing the ground pulp into corresponding pulp mixing tanks, adding wet strength agent, and diluting to 0.8-1.0%; wet strength agent addition: 3.0%;
4) Manufacturing: diluting the prepared slurry to 0.08-0.10% concentration, pumping the slurry into a papermaking pond, forming a layer of cylinder by a pulp pump, and then squeezing and drying the slurry by a drying cylinder; the base paper is quantitatively controlled at 11-12g/m 2 The air permeability of the base paper is controlled to 25000-35000CU;
5) Coating a heat sealing material: and (3) coating PE emulsion on one side of the base paper in a single-side spraying mode, wherein the concentration of the PE emulsion is as follows: 55% of viscosity 240 mPa.s, and the mass ratio of the hot-adhesive coating layer in the whole paper is as follows: 30%;
6) And (3) drying: drying a high-temperature drying cylinder;
7) Coiling, checking, cutting and packaging.
The detection results are shown in the attached table.
Example 3 a novel heat seal tea filter paper: (for making double bag heat-seal tea bag)
1) The slurry ratio is as follows: the plant fiber is selected from 85% of softwood pulp and 15% of abaca pulp, and the pulp is respectively added into a pulper for disintegrating;
2) Fluffing and pulping: pulp slurry is disintegrated and soaked, fluffed and pulped, and the pulp grinding concentration is controlled to be 4.0-6.0%; the beating degree of the slurry is controlled as follows: 25-28 ° SR, wet weight: not less than 8g. After fluffing and pulping, putting the pulp into a corresponding pulping pool;
3) Preparing slurry: respectively placing the ground pulp into corresponding pulp mixing tanks, adding wet strength agent, and diluting to 0.8-1.0%; wet strength agent addition: 4.0%;
4) Manufacturing: diluting the prepared slurry to 0.08-0.10% concentration, pumping the slurry into a papermaking pond, forming a layer of slurry by a pulp flushing pump on an inclined wire, and then squeezing and drying the slurry by a drying cylinder; the base paper is quantitatively controlled at 9-10g/m 2 The air permeability of the base paper is controlled to be 30000-40000CU;
5) Coating a heat sealing material: the PE emulsion is coated on the two sides of the base paper respectively, the PE emulsion is coated on the main heat-sealing surface, the PP emulsion is coated on the secondary heat-sealing surface, and the concentration is as follows: 60% and viscosity 290 mPa.s, the mass ratio of the main heat-seal layer in the whole paper is: 35%, the mass ratio of the secondary heat-sealing layer in the whole paper is as follows: 6%;
6) And (3) drying: shaping a high-temperature drying cylinder;
7) Coiling, checking, cutting and packaging.
The detection results are shown in the attached table.
Example 4 a novel heat seal tea filter paper: (for making Single bag Heat sealed tea bag)
1) The slurry ratio is as follows: plant fiber is selected from 70% of softwood pulp and 30% of bamboo pulp, and the pulp is respectively added into a pulper for disintegrating;
2) Fluffing and pulping: pulp slurry is disintegrated and soaked, fluffed and pulped, and the pulp grinding concentration is controlled to be 4.0-6.0%; the beating degree of the slurry is controlled as follows: 24-26 ° SR, wet weight: not less than 6g. After fluffing and pulping, putting the pulp into a corresponding pulping pool;
3) Preparing slurry: respectively placing the ground pulp into corresponding pulp mixing tanks, adding wet strength agent, and diluting to 0.8-1.0%; wet strength agent addition: 5.0%;
4) Manufacturing: diluting the prepared slurry to 0.08-0.10% concentration, pumping the slurry into a papermaking pond, forming a layer of slurry by a pulp flushing pump on an inclined wire, and then squeezing and drying the slurry by a drying cylinder; the base paper is quantitatively controlled to 9.5-10.5g/m 2 The air permeability of the base paper is controlled to be 26000-36000CU;
5) Coating a heat sealing material: coating polylactic acid (PLA) emulsion concentration on one side of base paper by adopting a single-sided gravure printing mode: the viscosity of the adhesive coating layer is 350 mPa.s and 65%, and the mass ratio of the adhesive coating layer in the whole paper is as follows: 40%;
6) And (3) drying: shaping a high-temperature drying cylinder;
7) Coiling, checking, cutting and packaging.
The detection results are shown in the attached table.
Example 5 a novel heat-seal tea filter paper: (for making Single bag Heat sealed tea bag)
1) The slurry ratio is as follows: the plant fiber is prepared by respectively adding 100% softwood pulp into a pulper for disintegrating;
2) Fluffing and pulping: pulp slurry is disintegrated and soaked, fluffed and pulped, and the pulp grinding concentration is controlled to be 4.0-6.0%; the beating degree of the slurry is controlled as follows: 18-20 ° SR, wet weight: not less than 8g. After fluffing and pulping, putting the pulp into a corresponding pulping pool;
3) Preparing slurry: respectively placing the ground pulp into corresponding pulp mixing tanks, adding wet strength agent, and diluting to 0.8-1.0%; wet strength agent addition: 2.0%;
4) Manufacturing: diluting the prepared slurry to 0.02-0.03% concentration, pumping the slurry into a papermaking pond, forming a layer of slurry by a pulp flushing pump on an inclined wire, and then squeezing and drying the slurry by a drying cylinder; the base paper is quantitatively controlled to be 20.5-21.5g/m 2 The air permeability of the base paper is controlled to be 6000-7000CU;
5) Coating a heat sealing material: coating PP emulsion on one side of base paper in a single-side film transfer coating mode, wherein the concentration of the PP emulsion is as follows: 50% of a viscosity of 220 mPa.s, and a mass ratio of the hot-adhesive coating layer in the whole paper is as follows: 25%;
6) And (3) drying: shaping at a high temperature drying channel and drying by a drying cylinder;
7) Coiling, checking, cutting and packaging.
The detection results are shown in the attached table.
Example 6 a novel heat seal tea filter paper: (for making double bag heat-seal tea bag)
1) The slurry ratio is as follows: the plant fiber is selected from 85% of softwood pulp and 15% of abaca pulp, and the pulp is respectively added into a pulper for disintegrating;
2) Fluffing and pulping: pulp slurry is disintegrated and soaked, fluffed and pulped, and the pulp grinding concentration is controlled to be 4.0-6.0%; the beating degree of the slurry is controlled as follows: 20-22 DEG SR, wet weight: not less than 8g. After fluffing and pulping, putting the pulp into a corresponding pulping pool;
3) Preparing slurry: respectively placing the ground pulp into corresponding pulp mixing tanks, adding wet strength agent, and diluting to 0.8-1.0%; wet strength agent addition: 4.0%;
4) Manufacturing: diluting the prepared slurry to 0.08-0.10% concentration, pumping the slurry into a papermaking pond, forming a layer of slurry by a pulp flushing pump on an inclined wire, and then squeezing and drying the slurry by a drying cylinder; the base paper is quantitatively controlled to be 16-17g/m 2 The air permeability of the base paper is controlled between 7000 and 8000CU;
5) Coating a heat sealing material: the PE emulsion is coated on the two sides of the base paper respectively, the PE emulsion is coated on the main heat-sealing surface, the PP emulsion is coated on the secondary heat-sealing surface, and the concentration is as follows: 60% and viscosity 290 mPa.s, the mass ratio of the main heat-seal layer in the whole paper is: 35%, the mass ratio of the secondary heat-sealing layer in the whole paper is as follows: 6%;
6) And (3) drying: shaping a high-temperature drying cylinder;
7) Coiling, checking, cutting and packaging.
The detection results are shown in the attached table.
Comparative example 1 a novel heat-seal tea filter paper: (for making Single bag Heat sealed tea bag)
1) The slurry ratio is as follows: the plant fiber is prepared by respectively adding 100% softwood pulp into a pulper for disintegrating;
2) Fluffing and pulping: pulp slurry is disintegrated and soaked, fluffed and pulped, and the pulp grinding concentration is controlled to be 4.0-6.0%; the beating degree of the slurry is controlled as follows: 20-23 DEG SR, wet weight: 7g or more. After fluffing and pulping, putting the pulp into a corresponding pulping pool;
3) Preparing slurry: respectively placing the ground pulp into corresponding pulp mixing tanks, adding wet strength agent, and diluting to 0.8-1.0%; wet strength agent addition: 2.0%;
4) Manufacturing: diluting the prepared slurry to 0.02-0.03% concentration, pumping the slurry into a papermaking pond, forming a layer of slurry by a pulp flushing pump on an inclined wire, and then squeezing and drying the slurry by a drying cylinder; the base paper is quantitatively controlled at 12-13g/m 2 The air permeability of the base paper is controlled to be 20000-30000CU;
5) Coating a heat sealing material: coating PP emulsion on one side of base paper in a single-side film transfer coating mode, wherein the concentration of the PP emulsion is as follows: 50% of a viscosity of 220 mPa.s, and a mass ratio of the hot-adhesive coating layer in the whole paper is as follows: 25%;
6) And (3) drying: shaping at a high temperature drying channel and drying by a drying cylinder;
7) Coiling, checking, cutting and packaging.
The detection results are shown in the attached table.
Comparative example 2 a novel heat-seal tea filter paper: (for making Single bag Heat sealed tea bag)
1) The slurry ratio is as follows: the plant fiber is prepared by respectively adding 100% softwood pulp into a pulper for disintegrating;
2) Fluffing and pulping: pulp slurry is disintegrated and soaked, fluffed and pulped, and the pulp grinding concentration is controlled to be 4.0-6.0%; the beating degree of the slurry is controlled as follows: 20-23 DEG SR, wet weight: 7g or more. After fluffing and pulping, putting the pulp into a corresponding pulping pool;
3) Preparing slurry: respectively placing the ground pulp into corresponding pulp mixing tanks, adding wet strength agent, and diluting to 0.8-1.0%; wet strength agent addition: 2.0%;
4) Manufacturing: diluting the prepared slurry to 0.02-0.03% concentration, pumping the slurry into a papermaking pond, forming a layer of slurry by a pulp flushing pump on an inclined wire, and then squeezing and drying the slurry by a drying cylinder; the base paper is quantitatively controlled at 12-13g/m 2 The air permeability of the base paper is controlled to be 20000-30000CU;
5) Coating a heat sealing material: coating PP emulsion on one side of base paper in a single-side film transfer coating mode, wherein the concentration of the PP emulsion is as follows: 30% of a heat-adhesive coating layer, with a viscosity of 100 mPa.s, in the whole paper, in a mass ratio of: 25%;
6) And (3) drying: shaping at a high temperature drying channel and drying by a drying cylinder;
7) Coiling, checking, cutting and packaging.
The detection results are shown in the attached table.
Comparative example 3 a novel heat-seal tea filter paper: (for making Single bag Heat sealed tea bag)
1) The slurry ratio is as follows: the plant fiber is prepared by respectively adding 100% softwood pulp into a pulper for disintegrating;
2) Fluffing and pulping: pulp slurry is disintegrated and soaked, fluffed and pulped, and the pulp grinding concentration is controlled to be 4.0-6.0%; the beating degree of the slurry is controlled as follows: 20-23 DEG SR, wet weight: 7g or more. After fluffing and pulping, putting the pulp into a corresponding pulping pool;
3) Preparing slurry: respectively placing the ground pulp into corresponding pulp mixing tanks, adding wet strength agent, and diluting to 0.8-1.0%; wet strength agent addition: 2.0%;
4) Manufacturing: diluting the prepared slurry to 0.02-0.03% concentration, pumping the slurry into a papermaking pond, forming a layer of slurry by a pulp flushing pump on an inclined wire, and then squeezing and drying the slurry by a drying cylinder; the base paper is quantitatively controlled at 12-13g/m 2 The air permeability of the base paper is controlled to be 20000-30000CU;
5) Coating a heat sealing material: coating PP emulsion on one side of base paper in a single-side film transfer coating mode, wherein the concentration of the PP emulsion is as follows: 75% of viscosity 439 mPa.s, and the mass ratio of the hot-adhesive coating layer in the whole paper is as follows: 25%;
6) And (3) drying: shaping at a high temperature drying channel and drying by a drying cylinder;
7) Coiling, checking, cutting and packaging.
The detection results are shown in the attached table.
Comparative example 4 a novel heat-seal tea filter paper: (for making double bag heat-seal tea bag)
1) The slurry ratio is as follows: the plant fiber is selected from 85% of softwood pulp and 15% of abaca pulp, and the pulp is respectively added into a pulper for disintegrating;
2) Fluffing and pulping: pulp slurry is disintegrated and soaked, fluffed and pulped, and the pulp grinding concentration is controlled to be 4.0-6.0%; the beating degree of the slurry is controlled as follows: 20-22 DEG SR, wet weight: not less than 8g. After fluffing and pulping, putting the pulp into a corresponding pulping pool;
3) Preparing slurry: respectively placing the ground pulp into corresponding pulp mixing tanks, adding wet strength agent, and diluting to 0.8-1.0%; wet strength agent addition: 4.0%;
4) Manufacturing: diluting the prepared slurry to 0.08-0.10% concentration, pumping the slurry into a papermaking pond, forming a layer of slurry by a pulp flushing pump on an inclined wire, and then squeezing and drying the slurry by a drying cylinder; the base paper is quantitatively controlled at 9-10g/m 2 The air permeability of the base paper is controlled between 35000 and 40000CU;
5) Coating a heat sealing material: the PE emulsion is coated on the two sides of the base paper respectively, the PE emulsion is coated on the main heat-sealing surface, the PP emulsion is coated on the secondary heat-sealing surface, and the concentration is as follows: 30% of a main heat-seal layer, with a viscosity of 100 mPa.s, the mass ratio of the main heat-seal layer in the whole paper being: 35%, the mass ratio of the secondary heat-sealing layer in the whole paper is as follows: 6%;
6) And (3) drying: shaping a high-temperature drying cylinder;
7) Coiling, checking, cutting and packaging.
The detection results are shown in the attached table.
Comparative example 5 a novel heat-seal tea filter paper: (for making double bag heat-seal tea bag)
1) The slurry ratio is as follows: the plant fiber is selected from 85% of softwood pulp and 15% of abaca pulp, and the pulp is respectively added into a pulper for disintegrating;
2) Fluffing and pulping: pulp slurry is disintegrated and soaked, fluffed and pulped, and the pulp grinding concentration is controlled to be 4.0-6.0%; the beating degree of the slurry is controlled as follows: 20-22 DEG SR, wet weight: not less than 8g. After fluffing and pulping, putting the pulp into a corresponding pulping pool;
3) Preparing slurry: respectively placing the ground pulp into corresponding pulp mixing tanks, adding wet strength agent, and diluting to 0.8-1.0%; wet strength agent addition: 4.0%;
4) Manufacturing: diluting the prepared slurry to 0.08-0.10% concentration, pumping the slurry into a papermaking pond, forming a layer of slurry by a pulp flushing pump on an inclined wire, and then squeezing and drying the slurry by a drying cylinder; the base paper is quantitatively controlled at 9-10g/m 2 The air permeability of the base paper is controlled between 35000 and 40000CU;
5) Coating a heat sealing material: the PE emulsion is coated on the two sides of the base paper respectively, the PE emulsion is coated on the main heat-sealing surface, the PP emulsion is coated on the secondary heat-sealing surface, and the concentration is as follows: 75% and a viscosity of 439 mPa.s, the mass ratio of the main heat-seal layer in the whole paper is: 35%, the mass ratio of the secondary heat-sealing layer in the whole paper is as follows: 6%;
6) And (3) drying: shaping a high-temperature drying cylinder;
7) Coiling, checking, cutting and packaging.
The detection results are shown in the attached table.
Comparative example 6 a novel heat-seal tea filter paper: (for making Single bag Heat sealed tea bag)
1) The slurry ratio is as follows: the plant fiber is 15% of softwood pulp and 85% of hardwood pulp, and the pulp is respectively added into a pulper for disintegrating;
2) Fluffing and pulping: pulp slurry is disintegrated and soaked, fluffed and pulped, and the pulp grinding concentration is controlled to be 4.0-6.0%; the beating degree of the slurry is controlled as follows: 23-25 ° SR, wet weight: not less than 6g. After fluffing and pulping, putting the pulp into a corresponding pulping pool;
3) Preparing slurry: respectively placing the ground pulp into corresponding pulp mixing tanks, adding wet strength agent, and diluting to 0.8-1.0%; wet strength agent addition: 3.0%;
4) Manufacturing: diluting the prepared slurry to 0.08-0.10% concentration, pumping the slurry into a papermaking pond, forming a layer of cylinder by a pulp pump, and then squeezing and drying the slurry by a drying cylinder; the base paper is quantitatively controlled at 12-13g/m 2 The air permeability of the base paper is controlled between 9500 and 10500CU;
5) Coating a heat sealing material: coating PP emulsion on one side of base paper in a single-side spraying mode, wherein the concentration of the PP emulsion is as follows: 50% of a viscosity of 220 mPa.s, and a mass ratio of the hot-adhesive coating layer in the whole paper is as follows: 25%;
6) And (3) drying: drying a high-temperature drying cylinder;
7) Coiling, checking, cutting and packaging.
The detection results are shown in the attached table.
Comparative example 7 a novel heat seal tea filter paper: (for making Single bag Heat sealed tea bag)
1) The slurry ratio is as follows: the plant fiber is 15% of softwood pulp and 85% of hardwood pulp, and the pulp is respectively added into a pulper for disintegrating;
2) Fluffing and pulping: pulp slurry is disintegrated and soaked, fluffed and pulped, and the pulp grinding concentration is controlled to be 4.0-6.0%; the beating degree of the slurry is controlled as follows: 18-20 ° SR, wet weight: not less than 6g. After fluffing and pulping, putting the pulp into a corresponding pulping pool;
3) Preparing slurry: respectively placing the ground pulp into corresponding pulp mixing tanks, adding wet strength agent, and diluting to 0.8-1.0%; wet strength agent addition: 3.0%;
4) Manufacturing: diluting the prepared slurry to 0.08-0.10% concentration, pumping into a papermaking pond, and forming a layer by using a cylinder mould on a pulp pumpSqueezing and drying the shape by a drying cylinder; the base paper is quantitatively controlled at 20-22g/m 2 The air permeability of the base paper is controlled to be 5000-6000CU;
5) Coating a heat sealing material: coating PP emulsion on one side of base paper in a single-side spraying mode, wherein the concentration of the PP emulsion is as follows: 50% of a viscosity of 220 mPa.s, and a mass ratio of the hot-adhesive coating layer in the whole paper is as follows: 25%;
6) And (3) drying: drying a high-temperature drying cylinder;
7) Coiling, checking, cutting and packaging.
The detection results are shown in the attached table.
Comparative example 8 a novel heat-seal tea filter paper: (for making double bag heat-seal tea bag)
1) The slurry ratio is as follows: the plant fiber is 15% of softwood pulp and 85% of abaca pulp, and the pulp is respectively added into a pulper for disintegrating;
2) Fluffing and pulping: pulp slurry is disintegrated and soaked, fluffed and pulped, and the pulp grinding concentration is controlled to be 4.0-6.0%; the beating degree of the slurry is controlled as follows: 20-22 DEG SR, wet weight: not less than 8g. After fluffing and pulping, putting the pulp into a corresponding pulping pool;
3) Preparing slurry: respectively placing the ground pulp into corresponding pulp mixing tanks, adding wet strength agent, and diluting to 0.8-1.0%; wet strength agent addition: 4.0%;
4) Manufacturing: diluting the prepared slurry to 0.08-0.10% concentration, pumping the slurry into a papermaking pond, forming a layer of slurry by a pulp flushing pump on an inclined wire, and then squeezing and drying the slurry by a drying cylinder; the base paper is quantitatively controlled to be 16-17g/m 2 The air permeability of the base paper is controlled between 7000 and 8000CU;
5) Coating a heat sealing material: the PE emulsion is coated on the two sides of the base paper respectively, the PE emulsion is coated on the main heat-sealing surface, the PP emulsion is coated on the secondary heat-sealing surface, and the concentration is as follows: 60% and viscosity 290 mPa.s, the mass ratio of the main heat-seal layer in the whole paper is: 35%, the mass ratio of the secondary heat-sealing layer in the whole paper is as follows: 6%;
6) And (3) drying: shaping a high-temperature drying cylinder;
7) Coiling, checking, cutting and packaging.
The detection results are shown in the attached table.
Comparative example 9 a double-layer structured heat-seal tea filter paper (conventional heat-seal tea filter paper on the market at present):
1) The slurry ratio is as follows: the tea filter paper consists of a base layer and a heat sealing layer, wherein the base layer is made of 100% wood pulp; the heat-sealing fiber accounts for 75% of the heat-sealing layer, and the heat-sealing fiber is 100% PP; the non-heat-seal fiber proportion in the heat-seal layer is 25%, and 100% wood pulp is selected.
2) Fluffing and pulping: the wood pulp slurry of the base layer and the heat sealing layer is disintegrated and soaked and then is respectively fluffed and pulped, and the pulping concentration is controlled to be 4.0-6.0%; the beating degree of the base layer slurry is controlled as follows: 21-23 ° SR, wet weight: not less than 8g; after fluffing and pulping, putting the pulp into a corresponding pulping pool; the viscose fiber and the PP fiber in the heat sealing layer are directly put into a corresponding pulping pond after being fluffed without pulping;
3) Preparing slurry: respectively placing the ground base layer slurry and the heat sealing layer slurry into different corresponding slurry preparing tanks, adding a wet strength agent, and diluting to a concentration of 0.8-1.0%; wet strength agent addition: 1.0%;
4) Manufacturing: the two layers of the prepared slurry are diluted to 0.02-0.04% concentration, pumped to different pre-papermaking tanks and formed into two layers by a inclined wire of a pulp pump, wherein a double-layer pulp box is selected to form on an inclined wire. Wherein the base layer comprises the following components in the mass of the paper fiber: 70% of heat-sealing layer in the mass of paper fiber: 30%; squeezing and drying;
5) High-temperature heat setting, coiling, slitting and packaging.
The detection results are shown in the attached table.
Comparative example 10A lightweight green heat-seal tea filter paper and method of making (application number: 201911057709.4)
1) Pulping: pulping the inner and outer heat sealing layer pulp respectively, wherein the paper mulberry stalk pulp concentration is 8%, and pulping by three-disc grinding until the beating degree is 22 DEG SR; the density of the totally chlorine-free bleached softwood pulp is 5 percent, and the softwood pulp is pulped by double disc grinding until the beating degree is 25 degrees SR; the modified polylactic acid fiber is pulped singly or mixed with viscose fiber, the pulp concentration is 0.8%, the cone-shaped pulping machine is pulped until the beating degree is controlled to be 11 DEG SR, the beaten pulp is mixed according to the mass ratio, and the cationic chitosan, the sodium carboxymethyl cellulose and the cationic guar gum are sequentially added, wherein the mass ratio of the three is 1.3:2.5. And treating for 35s by adopting a homogenizing grinder;
The length of the modified polylactic acid fiber is 2-4mm, the fineness is 2.0-3.5 Dtex, phthalic acid, adipic acid and butanediol are controlled to be used as a copolylactic acid modifier in the polycondensation process of polylactic acid, the addition amount of phthalic acid is 40%, the addition amount of oxalic acid is 7%, the addition amount of butanediol is 5%, and the melting point of a product is regulated to 140 ℃;
the paper mulberry stalk pulp is prepared by removing bast from paper mulberry of 3-5 years old by a peeler, cutting off and chipping until the length is 20mm and the thickness is 2-4mm; the wood chips are pretreated by biological enzyme, and then are pulped by an alkaline sodium sulfite chemical method and bleached completely without chlorine; the selected pretreatment strain is a high-temperature oyster mushroom white rot strain, acts on paper mulberry stalk wood chips when the culture is carried out to the highest biomass, controls the pH value to be 7.5 and the temperature to be 40 ℃ and the pretreatment time to be 48 hours;
2) Streaming: the slurry of the inner and outer heat-seal layers adopts mutually independent flow systems, the concentration of the slurry of the inner and outer heat-seal layers is 0.12 percent and 0.10 percent respectively, and the slurry is formed simultaneously by surfing the net through a double-layer slurry box;
3) And (5) net forming: dewatering and forming by adopting an inclined wire paper machine, wherein the inclined wire has an inclined angle of 13 degrees and a vehicle speed of 140m/min, the upper layer adopts paper mulberry stalk pulp mixed modified polylactic acid fibers, the lower layer adopts full chlorine-free bleached softwood pulp mixed modified polylactic acid fibers and viscose fibers, and the upper layer and the lower layer are simultaneously dewatered and compounded to obtain inner and outer heat seal layer paper;
4) And (3) squeezing: two-stage squeezing, one-stage vacuum squeezing, controlling the vacuum degree to be 0.20 Mpa and the line pressure to be 40kN/m; squeezing the two-stage blind hole, wherein the aperture ratio is 25%, and the line pressure is 60kN/m;
5) And (3) drying: drying in a drying tunnel mode at 110 ℃;
6) Calendering and shaping: performing hot press shaping on the two layers of composite paper by adopting a soft press roll, wherein the shaping temperature is 150 ℃ and the pressure is 0.5 MPa;
7) Slitting the roll paper: and (3) coiling by adopting a cylindrical paper coiling machine, and then cutting by adopting an online cutter to obtain products with different sizes and shapes.
The detection results are shown in the attached table.
Comparative example 11 preparation Process of Heat sealing tea Filter paper (application number: 201410405439.2)
1) Raw material preparation: the filter paper comprises a chemical fiber layer and a wood pulp layer, wherein the raw materials of the chemical fiber layer comprise the following components in proportion: 180kg of wood pulp, 130kg of chemical fiber, 20kg of wet strength agent, 3kg of carboxymethyl cellulose and 25 m 3 of water;
the chemical fiber is polypropylene fiber or polyethylene fiber, the length of the fiber is 3-5mm, and the fineness is 3Dtex;
the wood pulp layer comprises the following components in proportion: 200kg of wood pulp, 10kg of dialdehyde starch, 8kg of hydroxyethyl cellulose and 14m of water 3 ；
2) Pulping: pulping wood pulp, chemical fiber and wet strength agent of the chemical fiber layer respectively, wherein the beating degree of the two raw materials is 22 degrees;
3) Papermaking: respectively papermaking the two parts of pulp to obtain chemical fiber base paper and wood pulp base paper; the specification of the chemical fiber base paper is 10g/m 2, and the specification of the wood pulp base paper is 14g/m 2 ，
4) Shaping: carrying out composite shaping on the two base papers by adopting a compression roller to obtain composite paper, wherein the temperature of the composite shaping is 150 ℃ and the pressure is 0.35 MPa;
5) And (3) cooling: cooling the shaped composite paper in 30s with cooling water at 20 ℃;
6) And (3) drying: drying the shaped composite paper at 55 ℃ for 8 hours;
7) Surface treatment: soaking the dried composite paper in a surface treating agent for 1min; the surface treating agent comprises the following components in parts by weight: 15 parts of gelatin, 2 parts of oxidized starch, 3 parts of calcium carbonate, 5 parts of xanthan gum, 5 parts of polyethylene glycol, 10 parts of chitosan and 150 parts of water;
8) And (3) drying: drying the surface-treated composite paper in low-temperature vacuum at 40 ℃ and 0.07 MPa to obtain a heat-seal type filter paper finished product, wherein the specification of the heat-seal type filter paper is 16g/m 2 。
The detection results are shown in the attached table.
Comparative example 12 double sided heat seal filter paper for double pouch manufacture and method of making the same (application number: 201010141769.7)
1) The double-sided heat-sealing tea filter paper adopts wood pulp mixed PP fiber on the main heat-sealing surface, the dosage of the PP fiber is 35 percent, wood pulp mixed ES fiber for the secondary heat-sealing cover, the dosage of the ES fiber is 28 percent, and the drying is performed in a drying tunnel. The double-sided heat-seal tea filter paper is formed by adopting an inclined wire paper machine.
The detection results are shown in the attached table.
Comparative example 13 Heat sealing tea Filter paper (application number: 201911339959.7)
The bottom layer is a mixed layer and consists of wood pulp and corn fiber, wherein the corn fiber is coarse 3.0 denier and 3mm long, and the corn fiber accounts for 50 percent; the top layer is a wood pulp layer and consists of full wood pulp, and the beating degree of the wood pulp is 18 0 SR, top layer 60%. And (5) papermaking by using a double-layer inclined net.
The detection results are shown in the attached table.
The detection method comprises the following steps:
quantitative measurement of GB/T451.2 paper and paperboard quantitative measurement;
tensile Strength measurement of GB/T12914 paper and paperboard tensile Strength;
wet strength: GB/T465.2 method for measuring tensile strength after immersing paper and board in water for a prescribed time;
the air permeability is measured by GB/T23227 cigarette paper, forming paper, tipping paper and material air permeability with directional air permeable belt;
the heat seal strength index is measured according to the requirements specified in the national standard of GB/T25436 heat seal tea Filter paper.
The results of the measurements are shown in Table 1 and Table 2.
TABLE 1
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TABLE 2
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art. The generic principles defined herein may be applied to 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 (17)
1. The heat-seal tea filter paper comprises base paper and a heat-bonding coating layer, and is characterized by comprising the following raw materials in percentage by mass:
softwood pulp: 30-100%;
hardwood pulp: 0-60%;
0-60% of bamboo pulp or 0-30% of hemp pulp;
the beating degree of all wood pulp slurry is 15-40 DEG SR, and the wet weight is more than or equal to 4g; the basis weight of the base paper is 9.0-25 g/m 2 The tightness is less than or equal to 0.40g/m 3 The thickness is controlled to be 20-80 mu m, and the air permeability is 4000-50000CU; the thermal bonding coating layer is formed by drying food-grade thermoplastic polyolefin or polylactic acid emulsion coated on one side or two sides of base paper, the solid content of the food-grade thermoplastic polyolefin or polylactic acid emulsion is 40-70%, the viscosity is 200-400mPa.s, and the mass percentage of the thermal bonding coating layer on the whole piece of filter paper is 20-60%.
2. The heat-seal tea leaf filter paper according to claim 1, wherein the base paper raw materials comprise the following materials in percentage by mass:
100% of softwood pulp;
or 50-70% of softwood pulp and 30-50% of hardwood pulp;
or 70-90% of softwood pulp and 10-30% of hemp pulp;
or 60-80% of softwood pulp and 20-40% of bamboo pulp.
3. A heat-seal tea leaf filter paper according to claim 1, wherein the base paper stock has a freeness of 20 to 30 0 SR, wet weight: not less than 6g.
4. A heat-seal tea leaf filter paper according to claim 1, wherein the basis weight is 11-15 g/m 2 The tightness is less than or equal to 0.40g/m 3 The thickness is controlled to be 30-50 mu m, and the air permeability is 20000-40000CU.
5. A heat seal tea leaf filter paper according to claim 1 wherein the base paper stock further comprises a wet strength agent of 1.0 to 6.0%.
6. A heat seal tea leaf filter paper according to claim 5 wherein the wet strength agent is 2.0-5.0%.
7. A heat-seal tea leaf filter paper according to claim 1, wherein the food grade thermoplastic polyolefin or polylactic acid emulsion has a solids content of 50-65% and a viscosity of 220-350mpa.s.
8. A heat seal tea leaf filter paper according to claim 1 wherein the thermoplastic polyolefin is one or more of polypropylene PP, polyethylene PE, nylon PA and EVA.
9. A heat seal tea leaf filter paper according to claim 8 wherein the thermoplastic polyolefin is polypropylene PP or polyethylene PE.
10. The heat-seal tea leaf filter paper according to claim 1, wherein the heat-seal tea leaf filter paper is required for manufacturing a single-bag heat-seal tea bag, and the mass ratio of the heat-seal coating layer on the whole paper is as follows: 20-50%.
11. The heat-seal tea leaf filter paper according to claim 10, wherein the mass ratio of the heat-seal coating layer on the whole paper is: 25-40%.
12. The heat-seal tea leaf filter paper according to claim 1, wherein the heat-seal tea leaf filter paper is a heat-seal tea leaf filter paper required for manufacturing a double-bag heat-seal tea bag, the heat-seal coating layer comprises a main heat-seal layer and a secondary heat-seal layer which are respectively arranged on two sides of the base paper, and the mass ratio of the main heat-seal layer to the whole paper is as follows: 20-50% of the secondary heat sealing layer in the whole paper, wherein the mass ratio of the secondary heat sealing layer to the whole paper is as follows: 4-10%.
13. A heat-seal tea leaf filter paper according to claim 12 wherein the mass ratio of the main heat-seal layer to the whole paper is: 25-40% of the secondary heat sealing layer in the whole paper, wherein the mass ratio of the secondary heat sealing layer to the whole paper is as follows: 5-8%.
14. The heat-seal tea leaf filter paper according to claim 1, wherein the base paper is formed by a layer of net part of a paper machine, and the paper machine is a cylinder, inclined, clamped or fourdrinier paper machine; the thermoplastic polyolefin or polylactic acid emulsion is coated on the surface of the base paper by any one or two of single-sided film transfer coating, single-sided spraying or single-sided intaglio printing methods on one or two sides of the base paper.
15. A heat seal tea leaf filter paper according to claim 14 wherein the paper machine is a cylinder mould or inclined wire machine.
16. A method of producing a heat-seal tea leaf filter paper as claimed in any one of claims 1 to 15, the method comprising the steps of:
1) Wood pulp disintegration: respectively adding softwood pulp, hardwood pulp, bamboo pulp or hemp pulp into a pulper for disintegrating, and respectively storing;
2) Fluffing and pulping: respectively defibering and pulping after pulp is crushed and soaked, wherein the pulping concentration is controlled to be 4.0-6.0%, the pulping degree of all wood pulp is 15-40 DEG SR, and the wet weight is more than or equal to 4g; respectively placing the pulp into corresponding pulping tanks after the fluffing and pulping are completed;
3) Preparing slurry: the ground slurry is prepared in a slurry preparation tank according to a certain proportion, and then the wet strength agent is added in the slurry preparation tank for 1.0 to 6.0 percent, and the wet strength agent is diluted to the concentration of 0.8 to 2.0 percent and then added in the slurry preparation tank;
4) Manufacturing: diluting the prepared slurry to 0.02-0.06% concentration, pumping to a corresponding papermaking front tank, respectively screening by a pulp pump for forming, squeezing, and drying by a drying cylinder;
5) Coating thermoplastic polyolefin or polylactic acid emulsion: coating thermoplastic polyolefin or polylactic acid emulsion on one side or two sides of base paper according to the requirement by any one or more of single-side coating, single-side spraying or single-side gravure printing methods;
6) Drying, coiling, checking, slitting and packaging by a dryer or a drying tunnel.
17. A teabag is characterized by comprising a packaging bag and tea dust; the tea dust is arranged in the packaging bag; the packaging bag is made of tea leaf filter paper, and the tea leaf filter paper adopts the heat-sealing tea leaf filter paper according to any one of claims 1-15.
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| JPH11350382A (en) * | 1998-06-01 | 1999-12-21 | Taiko Seishi Kk | Heat-sealable packaging material for food |
| JP2001081627A (en) * | 1999-09-06 | 2001-03-27 | Mitsui Chemicals Inc | Polyolefin synthetic pulp and heat-sealable paper |
| CN101797999A (en) * | 2010-03-02 | 2010-08-11 | 昆明春叶塑料制成品有限公司 | Packaging film for natural cellulose cigarette with heat sealing layer-coated surface |
| CN203755089U (en) * | 2013-08-16 | 2014-08-06 | 遂昌县兴昌纸业有限公司 | Double-sided hot sealing filter paper |
| CN111155355A (en) * | 2019-12-23 | 2020-05-15 | 浙江同创新材料科技有限公司 | Heat-sealing type tea filter paper |
| CN112941946A (en) * | 2021-04-14 | 2021-06-11 | 中国制浆造纸研究院衢州分院 | Production method of heat-sealable food packaging paper |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8067087B2 (en) * | 2005-09-08 | 2011-11-29 | Wausau Paper Mills, Llc | Heat seal adhesive paper product, method for manufacturing, and laminate product |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11350382A (en) * | 1998-06-01 | 1999-12-21 | Taiko Seishi Kk | Heat-sealable packaging material for food |
| JP2001081627A (en) * | 1999-09-06 | 2001-03-27 | Mitsui Chemicals Inc | Polyolefin synthetic pulp and heat-sealable paper |
| CN101797999A (en) * | 2010-03-02 | 2010-08-11 | 昆明春叶塑料制成品有限公司 | Packaging film for natural cellulose cigarette with heat sealing layer-coated surface |
| CN203755089U (en) * | 2013-08-16 | 2014-08-06 | 遂昌县兴昌纸业有限公司 | Double-sided hot sealing filter paper |
| CN111155355A (en) * | 2019-12-23 | 2020-05-15 | 浙江同创新材料科技有限公司 | Heat-sealing type tea filter paper |
| CN112941946A (en) * | 2021-04-14 | 2021-06-11 | 中国制浆造纸研究院衢州分院 | Production method of heat-sealable food packaging paper |
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