CN116240752A - Preparation process of heat-sealable full wood pulp packaging paper - Google Patents
Preparation process of heat-sealable full wood pulp packaging paper Download PDFInfo
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- CN116240752A CN116240752A CN202310081665.9A CN202310081665A CN116240752A CN 116240752 A CN116240752 A CN 116240752A CN 202310081665 A CN202310081665 A CN 202310081665A CN 116240752 A CN116240752 A CN 116240752A
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- ethylene copolymer
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- 238000004806 packaging method and process Methods 0.000 title claims abstract description 39
- 229920001131 Pulp (paper) Polymers 0.000 title abstract description 9
- 238000002360 preparation method Methods 0.000 title abstract description 6
- 239000000123 paper Substances 0.000 claims abstract description 116
- 238000000576 coating method Methods 0.000 claims abstract description 64
- 239000011248 coating agent Substances 0.000 claims abstract description 59
- 239000000839 emulsion Substances 0.000 claims abstract description 46
- 229920001038 ethylene copolymer Polymers 0.000 claims abstract description 45
- HDERJYVLTPVNRI-UHFFFAOYSA-N ethene;ethenyl acetate Chemical group C=C.CC(=O)OC=C HDERJYVLTPVNRI-UHFFFAOYSA-N 0.000 claims abstract description 41
- 229920006243 acrylic copolymer Polymers 0.000 claims abstract description 31
- 239000012793 heat-sealing layer Substances 0.000 claims abstract description 31
- 239000000203 mixture Substances 0.000 claims abstract description 25
- 229920002126 Acrylic acid copolymer Polymers 0.000 claims abstract description 15
- 239000011087 paperboard Substances 0.000 claims abstract description 9
- 239000010410 layer Substances 0.000 claims description 32
- 239000011121 hardwood Substances 0.000 claims description 15
- 239000011122 softwood Substances 0.000 claims description 15
- 239000002023 wood Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 7
- 238000007789 sealing Methods 0.000 abstract description 17
- 230000015556 catabolic process Effects 0.000 abstract description 5
- 238000006731 degradation reaction Methods 0.000 abstract description 5
- 238000012856 packing Methods 0.000 description 24
- 239000002994 raw material Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- 239000000835 fiber Substances 0.000 description 9
- 229920003023 plastic Polymers 0.000 description 9
- 239000004033 plastic Substances 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000010521 absorption reaction Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 239000005022 packaging material Substances 0.000 description 4
- 229920003002 synthetic resin Polymers 0.000 description 4
- 239000000057 synthetic resin Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 4
- 229920002554 vinyl polymer Polymers 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 235000013305 food Nutrition 0.000 description 3
- -1 polypropylene Polymers 0.000 description 3
- 241001397809 Hakea leucoptera Species 0.000 description 2
- 241001122767 Theaceae Species 0.000 description 2
- 238000007774 anilox coating Methods 0.000 description 2
- 230000000844 anti-bacterial effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 238000009998 heat setting Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 239000004831 Hot glue Substances 0.000 description 1
- 229920012485 Plasticized Polyvinyl chloride Polymers 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000005030 aluminium foil Substances 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000013536 elastomeric material Substances 0.000 description 1
- 239000003205 fragrance Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000012775 heat-sealing material Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 238000007719 peel strength test Methods 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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
- D21H27/10—Packing paper
-
- 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
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
- D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds 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
- 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
-
- 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)
- Wrappers (AREA)
- Paper (AREA)
Abstract
The invention belongs to the technical field of papermaking, and particularly relates to a preparation process of heat-sealable full wood pulp packaging paper and a heat-sealing layer coating process. The invention uses a printing coating mode to arrange a heat sealing layer at the joint of the paperboards by utilizing the paperboards which can form an internal closed space at the joint of the paperboards; the heat-sealing layer comprises one or a mixture of several of acrylic acid copolymer or vinyl acetate-ethylene copolymer emulsion. The heat sealing layer is arranged at the joint of the paper package, so that the paper package can be used for packaging target products by adopting simple heat sealing equipment, time and labor are saved, and the paper has full degradation performance. And the acrylic copolymer and the vinyl acetate-ethylene copolymer emulsion have higher performance after being mixed, such as better sealing performance, thermal stability and the like due to the improvement of gel strength.
Description
Technical Field
The invention belongs to the technical field of papermaking, and particularly relates to a preparation process of heat-sealable full wood pulp packaging paper.
Background
The paper package is taken as a degradable environment-friendly packaging material which effectively replaces plastic package, is widely applied to various industries, such as food industry, express industry, retail industry and the like, the consumption level of paper and packaging paper is an important mark for measuring the modernization level and civilization level of China, and various preferential policies are also provided for the paper package by many countries, so that the market using amount and development space are larger.
At present, paper with heat sealing function is prepared by several ways, namely, a composite process is adopted, namely, paper board, other plastics, films and the like are laminated by using an adhesive to obtain composite paper, mainly improving the performances of water resistance, moisture resistance, oil resistance, air tightness, fragrance retention and the like, and simultaneously, heat sealing performance, light resistance, heat resistance and the like can be obtained. One is a chemical fiber having a heat-sealing function in the production process, such as polypropylene (pp) fiber or polyethylene (pe) fiber, and the heat-sealing material is generally made into a fiber shape, and is mixed with paper pulp, and after the paper is formed, heat-setting is performed, that is, the heat-sealing fiber is contracted into spots at a high temperature, and when in use, the spots have adhesiveness at a certain temperature, etc. These packages have adverse effects on the environment in recycling and degradation, and in particular, plastic limiting and plastic prohibiting policies are fully spread, and global plastic prohibiting has become a trend, so that it is necessary to find packaging materials capable of replacing plastics.
The paper package is an environment-friendly packaging material, however, unlike plastic package, the paper package has poor flexibility and plasticity, for example, chinese patent publication No. CN1104233906A discloses a preparation process of heat-sealing type tea filter paper, the filter paper adopts a two-layer structure, wood pulp is used as an inner layer, chemical fiber is used as an outer layer, and the paper is formed by heat setting and compounding after paper is made from the two raw materials. As chemical fibers or plastics are added, the degradation performance of paper is reduced, so that a paper packaging material which has full degradation performance and can be packaged quickly and conveniently is urgently needed in the market.
Disclosure of Invention
The invention aims to provide a preparation process of heat-sealable full wood pulp packaging paper, wherein a heat sealing layer is arranged at the joint of paper packaging, packaging treatment of the paper packaging on target products can be realized by adopting simple heat sealing equipment, time and labor are saved, and the paper has full degradation performance.
The invention adopts the technical proposal that: the manufacturing of the heat-sealed all-wood pulp packaging paper comprises a packaging paper body and a heat-sealing layer arranged on the packaging paper in a printing and coating mode; the heat sealing layer comprises one or a mixture of a plurality of acrylic acid copolymers or vinyl acetate-ethylene copolymer emulsions. In a preferred embodiment, the heat-sealing layer is a functional substance coating and is uniformly coated on the whole paper surface.
Wherein the wrapping paper uses a low gram weight paper wrapping paper (17 g/m 2 ) Compared with the traditional paper wrapping paper with high gram weight (24-28 g/m 2 ) The low gram weight packaging paper effectively lightens the whole quality of the packaged product. The packaging paper mainly comprises an inner side layer and an outer side layer, wherein the inner side layer is provided with a waterproof and/or antibacterial layer, and the waterproof and antibacterial layer can be simultaneously arranged when the paper package is used for packaging milk. The wrapper may additionally be provided with a hole structure and then sealed with a soft sealing layer such as aluminium foil for piercing by the straw.
In addition, the paper packaging paper is tissue paper, the raw material of the paper packaging paper is plant fiber, does not contain any chemical fiber, can be used as a substitute of coffee filter paper, tea filter paper or non-woven fabric, has the characteristics of green and environment-friendliness, is convenient to discard after being used, and does not pollute the environment. And tissue paper has the advantage that it is transparent, i.e. visual, and can be used for transparent heat sealable food packaging paper instead of thick packaging paper or plastic bags.
In addition, the heat sealing layer has a heat sealing temperature (90-130 ℃) which is higher than that of 150-160 ℃ in the prior art, so that the heat sealing working process can be completed by adopting lower temperature and shorter heat sealing time.
The heat-sealing layer has a composition which accords with the national standard GB 9685-2016 (food contact materials and additive use standards for products), and is preferably acrylic acid copolymer or vinyl acetate-ethylene copolymer emulsion. Wherein the acrylic acid copolymer refers to acrylic acid-hydroxypropyl acrylate copolymer, and the molecular formula is as followsIs ((C) 6 H 10 O 3 )·(C 3 H 4 O 2 )) x The vinyl acetate-ethylene copolymer emulsion refers to ethylene-vinyl acetate resin, that is, EVA, both of which can be used alone as a heat-sealable material or after blending. The acrylic copolymer and the vinyl acetate-ethylene copolymer emulsion have higher performance after being mixed, such as better sealing performance brought by improving gel strength, thermal stability and the like.
The further preferable technical scheme is as follows: the heat sealing layer is a mixture of the acrylic copolymer and vinyl acetate-ethylene copolymer emulsion, wherein the viscosity of the acrylic copolymer is 10-3000 mPa.s, and the viscosity of the vinyl acetate-ethylene copolymer emulsion is 1700-4400 mPa.s.
The viscosity of the acrylic copolymer and the vinyl acetate-ethylene copolymer emulsion is related to the molecular weight of the two and affects the viscosity of the mixture after blending, and it is generally required that the viscosity of the acrylic copolymer and the vinyl acetate-ethylene copolymer emulsion be in a proper range, a smaller viscosity will cause unstable adhesion, and a larger viscosity will affect the smooth progress of the printing and coating process of the wrapping paper in the preceding step and the progress of the subsequent heat sealing process.
The further preferable technical scheme is as follows: the viscosity of the acrylic copolymer is 2250-2450 mPas, and the viscosity of the vinyl acetate-ethylene copolymer emulsion is 3400-3650 mPas.
The further preferable technical scheme is as follows: the heat-sealing layer is acrylic acid copolymer, and the coating amount on the joint of the packaging paper is 1-8 g/m 2 。
The amount of coating directly affects the thickness of the heat seal layer after it has been applied to the wrapper connection, which should be in a suitable thickness range that facilitates bonding the two wrapper connections together, and which may not be so thick that the heat seal layer is not associated, such that the sealing effect is reduced.
The further preferable technical scheme is as follows: the heat sealing layer is vinyl acetate-ethylene copolymer emulsion and is arranged at the joint of the packaging paper at a ratio of 5-20g/m 2 Is coated by the addition amount of (3).
The further preferable technical scheme is as follows: the heat sealing layer is a mixture of acrylic acid copolymer and vinyl acetate-ethylene copolymer emulsion, and the joint of the packaging paper is 10-16g/m 2 Is coated by the addition amount of (3).
The further preferable technical scheme is as follows: when the heat-seal layer is uniformly coated on the whole paper surface, the coating amount is 2-5 g/m 2 . The advantage of such a low coating weight is that: 1. the coating is simple and convenient, and the operation is easy; 2. the coating dosage is small, and the resources are saved. The further preferable technical scheme is as follows: the heat-sealing layer is a mixture of acrylic acid copolymer and vinyl acetate-ethylene copolymer emulsion, and the mass ratio of the heat-sealing layer to the mixture is 1:1-2.5.
The ratio of acrylic copolymer to vinyl acetate-ethylene copolymer emulsion also affects the properties of the final blend, such as its water absorption properties, since the hydrophilic groups of the acrylic copolymer are less than those of the vinyl acetate-ethylene copolymer emulsion, and if the ratio of acrylic copolymer is too large, the water absorption properties of the synthetic resin formed by the two are reduced. The water absorption performance influences the adhesive property of the synthetic resin in certain aspects, the excessive water absorption performance leads to high water consumption in the production process, lower production efficiency is caused, and the smaller water absorption performance can generate excessive side crosslinking phenomenon in the synthetic resin, so that the adhesive property of the synthetic resin is reduced.
The further preferable technical scheme is as follows: the wrapping paper raw material comprises softwood and hardwood, wherein the softwood pulp degree is 89+/-1 O SR, mass concentration is 3.5+ -0.2%, and the hardwood pulp degree is 35+ -1 O SR, mass concentration is 4.0+ -0.2%.
The mixed wood pulp of needle wood and broad-leaved wood is used in the raw materials, so that the gram weight of the finally obtained paper package is lower, the surface is smooth enough, and the paper package is suitable for the coating process of the heat sealing layer.
A printing coating process for a heat sealing layer of wood packaging paper uses a coating roller with 250-500 meshes to carry out printing coating.
The coating roller is arranged in a coating groove for coating the packaging paper and can freely rotate, a part of the outer periphery of the coating roller is immersed in the polymer emulsion, then a control roller which rotates reversely is additionally arranged in the coating groove and is adjacent to the coating roller, and the thickness of the emulsion attached to the outer periphery of the coating roller is determined by the interval between the coating roller and the control roller, so that the control effect on the gram weight of the heat-sealing layer coated on the paper package is realized.
In addition, in a preferred scheme, the coating roller uses an anilox roller, and the mesh number of anilox is controlled to further adjust the sizing amount of the coating roller, so that the gram weight of the heat-sealing layer coated on the paper package is controlled.
The further preferable technical scheme is as follows: the pressure of the coating roller is 0.25-0.35mPa.
It is necessary that the application roller presses the paper package within the prescribed limits, and the appropriate pressure is such that the heat seal layer is applied flat to the paper package without localized depressions or protrusions, but excessive pressure will damage the structure of the middle layer of the paper package.
The above-described manufacturing materials, processes and apparatus are suitable for any paper package having a heat seal layer. Other objects and advantages concerning the summary of the technical solution of the present invention will be further illustrated in the examples.
Detailed Description
Acrylic acid copolymer
The acrylic copolymer used in this example, which was subjected to addition of other auxiliaries in actual production, had a controller molecular weight of 120 to 130, a mass solids content of 40.+ -. 1%, a pH of 7.0 to 10.0, and a density: 1.04-1.08 g/cm 3 The acrylic copolymer belongs to low molecular weight solid resin, meets the performance requirements of EEW, viscosity and softening point, and has excellent flexibility and storage and transportation stability. In addition, the modified acrylic copolymer has excellent water resistance, oil resistance, adhesion resistance and heat sealing performance, and does not influence paper recovery
Vinyl acetate-ethylene copolymer emulsion
The vinyl acetate-ethylene copolymer emulsion used in this example was controlled by adding an auxiliary agent, and the parameters were controlled as follows: the pH value is 3.0-6.0, and the density is 1.06g/cm 3 . Wherein the weight percentage of the vinyl acetate is between 10 percent and 40 percent, and the rest isEthylene, a vinyl acetate-ethylene copolymer emulsion at this ratio, has thermoplastic properties and is a thermoplastic elastomeric material that is not vulcanized but has certain properties of rubber or plasticized polyvinyl chloride, particularly at the upper end of the range. Both filled and unfilled vinyl acetate-ethylene copolymer materials have good low temperature properties and are tough and useful as hot melt adhesives.
The process of making the paper package uses conventional manufacturing techniques in the art and is not further described in this application.
The following description is of the preferred embodiments of the invention and is not intended to limit the scope of the invention.
Example 1:
the heat-sealed wooden packing paper comprises packing paper capable of forming an internal closed space by using the joint of the packing paper, and a heat-sealing layer arranged at the joint of the packing paper in a printing and coating mode; the heat-sealing layer is an acrylic acid copolymer, wherein:
the viscosity of the acrylic copolymer was 2450 mPa.s and the coating weight at the joint of the wrapper was 8g/m 2 。
The packaging paper raw materials are selected from softwood and hardwood, wherein the degree of the softwood pulp is 89 O SR, mass concentration is 3.5%, and the hardwood pulp degree is 35 O SR, mass concentration is 4.0%.
The printing coating was performed using a 500-mesh coating roll having a pressure of 0.35mPa, to prepare a heat-sealed paper packaging sample 1.
Example 2:
the heat-sealed wooden packing paper comprises packing paper capable of forming an internal closed space by using the joint of the packing paper, and a heat-sealing layer arranged at the joint of the packing paper in a printing and coating mode; the heat-sealing layer is vinyl acetate-ethylene copolymer emulsion, wherein:
the viscosity of the vinyl acetate-ethylene copolymer emulsion was 3650 mPa.s and the coating amount at the joint of the wrapping paper was 20g/m 2 。
The raw material of the wrapping paper is needle wood and broad-leaved woodWherein the softwood pulp has a degree of 89 O SR, mass concentration is 3.5%, and the hardwood pulp degree is 35 O SR, mass concentration is 4.0%.
The printing coating was performed using a 500-mesh coating roll having a pressure of 0.35mPa, to prepare a heat-sealed paper packaging sample 2.
Example 3:
the heat-sealed wooden packing paper comprises packing paper capable of forming an internal closed space by using the joint of the packing paper, and a heat-sealing layer arranged at the joint of the packing paper in a printing and coating mode; the heat seal layer is a mixture of acrylic acid copolymer and vinyl acetate-ethylene copolymer emulsion, wherein:
the viscosity of the acrylic copolymer was 2300 mPas, the viscosity of the vinyl ester-ethylene copolymer emulsion was 3500 mPas, and the mass ratio of the acrylic copolymer to the vinyl acetate-ethylene copolymer emulsion mixture was 1:1, the coating weight on the joint of the wrapping paper is 16g/m 2 。
The packaging paper raw materials are selected from softwood and hardwood, wherein the degree of the softwood pulp is 89 O SR, mass concentration is 3.5%, and the hardwood pulp degree is 35 O SR, mass concentration is 4.0%.
The printing coating was performed using a 500-mesh coating roll having a pressure of 0.35mPa, to prepare a heat-sealed paper packaging sample 3.
Example 4:
the heat-sealed wooden packing paper comprises packing paper capable of forming an internal closed space by using the joint of the packing paper, and a heat-sealing layer arranged at the joint of the packing paper in a printing and coating mode; the heat seal layer is a mixture of acrylic acid copolymer and vinyl acetate-ethylene copolymer emulsion, wherein:
the viscosity of the acrylic copolymer was 2250mPas, the viscosity of the vinyl ester-ethylene copolymer emulsion was 3400mPas, and the coating amount at the joint of the wrapping paper was 16g/m 2 。
The packaging paper raw materials are selected from softwood and hardwood, wherein the degree of the softwood pulp is 89 O SR, mass concentration is3.5% of said hardwood pulp having a degree of 35 O SR, mass concentration is 4.0%.
The printing coating was performed using a 250 mesh coating roll having a pressure of 0.35mPa, to prepare a heat-sealed paper packaging sample 4.
Example 5:
the heat-sealed wooden packing paper comprises packing paper capable of forming an internal closed space by using the joint of the packing paper, and a heat-sealing layer arranged at the joint of the packing paper in a printing and coating mode; the heat seal layer is a mixture of acrylic acid copolymer and vinyl acetate-ethylene copolymer emulsion, wherein:
the viscosity of the acrylic copolymer was 2450 mPas, the viscosity of the vinyl ester-ethylene copolymer emulsion was 3650 mPas, and the coating amount at the joint of the wrapping paper was 16g/m 2 。
The packaging paper raw materials are selected from softwood and hardwood, wherein the degree of the softwood pulp is 89 O SR, mass concentration is 3.5%, and the hardwood pulp degree is 35 O SR, mass concentration is 4.0%.
The printing coating was carried out using a 400-mesh coating roll having a pressure of 0.35mPa, to prepare a heat-sealed paper packaging sample 5.
Comparative example 1
The difference from example 3 is that the heat seal layer is dupont applicator 53070, resulting in heat sealed paper package sample 6.
Comparative example 2
Unlike example 3, the heat-seal layer was applied at the joint of the wrapping paper in an amount of 8g/m 2 A heat-sealed paper packaging sample 7 was produced.
Comparative example 3
The difference from example 3 is that the heat-seal layer was print-coated using a 150 mesh coating roller to produce a heat-sealed paper package sample 8.
The above samples were subjected to a seal test, the test results of which are shown in the following table,
wherein:
peel strength of
The peel strength test is based on Chinese national standard GB/T34444-2017 (determination of peel strength between paper and packaging paper), and specific parameters during the determination are as follows: the environment temperature is 25 ℃, the humidity is 90%, the parallelism of two paper sheets is within +/-0.05 mm, the incision is neat and free of any damage, the width dimension of a sample is 25.0 +/-0.05 mm, the length is 200mm, the long side direction of the sample is longitudinal, and the total tearing length of two ends of the peeling and supplementing position is 50mm.
Sample interlayer strength K, in N/m, results accurate to 4 significant digits, where:
K=F/D
wherein:
k, the interlayer peel strength of the sample, and the unit is N/m;
f, taking the average value of 10 samples as a unit N;
d-sample width, unit m;
as can be seen from examples 1-5, the final paper package had superior peel strength within the appropriate range. As can be seen from the properties of sample 3 in comparative example 3 and sample 6 in comparative example 1, when the heat-seal layer was changed from a mixture of acrylic copolymer and vinyl acetate-ethylene copolymer emulsion to a conventional thermoplastic material, the peel strength was significantly reduced, indicating that the mixture of acrylic copolymer and vinyl acetate-ethylene copolymer emulsion had higher sealable properties. And it can be seen from the properties of sample 3 in comparative example 3 and sample 7 in comparative example 2 that the mixture coating amount of the acrylic copolymer and the vinyl acetate-ethylene copolymer emulsion was less than 10 g/m 2 When the peel strength of the heat-seal layer formed is lowered. Further, it can be seen from the properties of sample 3 in comparative example 3 and sample 8 in comparative example 3 that when the number of the coating rolls is low, the peel strength of the heat-seal layer formed is lowered, and it is considered that the lower purpose coating rolls cause insufficient flatness of the heat-seal layer formed, unstable adhesion, and thus lowered heat-seal property.
Relation between the number of coating rolls and the mass ratio of the mixture of the acrylic copolymer and the vinyl acetate-ethylene copolymer emulsion
Example 6
The heat-sealed wooden packing paper comprises packing paper capable of forming an internal closed space by using the joint of the packing paper, and a heat-sealing layer arranged at the joint of the packing paper in a printing and coating mode; the heat seal layer is a mixture of acrylic acid copolymer and vinyl acetate-ethylene copolymer emulsion, wherein:
the viscosity of the acrylic copolymer was 2300 mPas, the viscosity of the vinyl ester-ethylene copolymer emulsion was 3500 mPas, and the coating amount at the joint of the wrapping paper was 16g/m 2 。
The packaging paper raw materials are selected from softwood and hardwood, wherein the degree of the softwood pulp is 89 O SR, mass concentration is 3.5%, and the hardwood pulp degree is 35 O SR, mass concentration is 4.0%.
The printing coating was carried out using a 500-mesh coating roll having a pressure of 0.35mPa.
Wherein, the mass ratio of the mixture of the acrylic acid copolymer and the vinyl acetate-ethylene copolymer emulsion is 1:1.2, 1.5, 1.8, 2.0, 2.3 and 2.5 respectively, and paper package samples 9, 10, 11, 12, 13 and 14 after heat sealing are respectively prepared.
The above samples were subjected to a seal test, the test results are shown in the following table:
it was found that the highest glass strength was obtained when the mass ratio of the acrylic copolymer to the vinyl acetate-ethylene copolymer emulsion mixture was 1:1.8, indicating that the mixture of acrylic copolymer and vinyl acetate-ethylene copolymer emulsion at this ratio performed best as a heat-seal layer.
The embodiments of the present invention have been described in detail, but the present invention is not limited to the above embodiments, and various modifications may be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. These are all non-inventive modifications which are intended to be protected by the patent laws within the scope of the appended claims.
Claims (10)
1. The heat-sealed wooden packaging paper comprises a packaging paper body and is characterized by also comprising a heat-sealing layer which is arranged at the joint of the paperboards in a printing and coating mode; the heat sealing layer comprises one or a mixture of a plurality of acrylic acid copolymers or vinyl acetate-ethylene copolymer emulsions.
2. The heat sealed wood wrapper according to claim 1, wherein the heat sealing layer is a mixture of the acrylic copolymer and a vinyl acetate-ethylene copolymer emulsion, wherein the viscosity of the acrylic copolymer is 10-3000 mPa-s and the viscosity of the vinyl acetate-ethylene copolymer emulsion is 1700-4400 mPa-s.
3. A heat-sealed wood wrapper according to claim 2, wherein the acrylic copolymer has a viscosity of 2250-2450 mPa-s and the vinyl acetate-ethylene copolymer emulsion has a viscosity of 3400-3650 mPa-s.
4. A heat sealed wood wrapper according to claim 1, wherein said heat sealed layer is an acrylic copolymer and the coating weight on the paperboard joint is 1-8 g/m 2 。
5. A heat sealed wood wrapper according to claim 1, wherein said heat sealed layer is a vinyl acetate-ethylene copolymer emulsion and the coating weight on said paperboard joint is 5-20g/m 2 。
6. A heat sealed wood wrapper according to claim 1, wherein the heat sealed layer is a mixture of acrylic copolymer and vinyl acetate-ethylene copolymer emulsion and the coating amount on the paperboard joint is 10-16g/m 2 。
7. The heat-sealed wood wrapper according to claim 1, wherein the heat-sealed layer is a mixture of acrylic copolymer and vinyl acetate-ethylene copolymer emulsion in a mass ratio of 1:1-2.5.
8. The heat sealed wood wrapper of claim 1 wherein said paperboard stock comprises softwood and hardwood wherein said softwood pulp has a degree of 89 ± 1 O SR, mass concentration is 3.5+ -0.2%, and the hardwood pulp degree is 35+ -1 O SR, mass concentration is 4.0+ -0.2%.
9. A process for the print coating of a heat-sealable layer of a wood wrapper according to any one of claims 1 to 8, wherein the print coating is carried out using a 250-500 mesh coating roll.
10. The print coating process of claim 8, wherein the pressure of the coating roll is 0.25-0.35mPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310081665.9A CN116240752A (en) | 2023-02-08 | 2023-02-08 | Preparation process of heat-sealable full wood pulp packaging paper |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310081665.9A CN116240752A (en) | 2023-02-08 | 2023-02-08 | Preparation process of heat-sealable full wood pulp packaging paper |
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| CN116240752A true CN116240752A (en) | 2023-06-09 |
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|---|---|---|---|---|
| JP2001181588A (en) * | 1999-12-24 | 2001-07-03 | Mitsui Chemicals Inc | Heat-sealable adhesive composition |
| JP2001179909A (en) * | 1999-12-24 | 2001-07-03 | Mitsui Chemicals Inc | Heat-sealing adhesive composition |
| CN102649892A (en) * | 2012-05-10 | 2012-08-29 | 海南必凯水性涂料有限公司 | High thermal-sealing type acrylic coating special for cigarette film and preparation method thereof |
| CN112693199A (en) * | 2020-12-21 | 2021-04-23 | 张家港永和包装印务有限公司 | Easy cover film of packaging paper container and heat sealing layer thereof |
| CN113106785A (en) * | 2021-03-16 | 2021-07-13 | 华邦古楼新材料有限公司 | Heat-sealing self-adhesive dialyzing paper and preparation method thereof |
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2023
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001181588A (en) * | 1999-12-24 | 2001-07-03 | Mitsui Chemicals Inc | Heat-sealable adhesive composition |
| JP2001179909A (en) * | 1999-12-24 | 2001-07-03 | Mitsui Chemicals Inc | Heat-sealing adhesive composition |
| CN102649892A (en) * | 2012-05-10 | 2012-08-29 | 海南必凯水性涂料有限公司 | High thermal-sealing type acrylic coating special for cigarette film and preparation method thereof |
| CN112693199A (en) * | 2020-12-21 | 2021-04-23 | 张家港永和包装印务有限公司 | Easy cover film of packaging paper container and heat sealing layer thereof |
| CN113106785A (en) * | 2021-03-16 | 2021-07-13 | 华邦古楼新材料有限公司 | Heat-sealing self-adhesive dialyzing paper and preparation method thereof |
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