CN107090737A - A kind of non-timber class natural color pulp food wrapper and preparation method thereof - Google Patents
A kind of non-timber class natural color pulp food wrapper and preparation method thereof Download PDFInfo
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- CN107090737A CN107090737A CN201710184412.9A CN201710184412A CN107090737A CN 107090737 A CN107090737 A CN 107090737A CN 201710184412 A CN201710184412 A CN 201710184412A CN 107090737 A CN107090737 A CN 107090737A
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- 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
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
- D21H15/10—Composite fibres
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
-
- 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
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
-
- 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
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Abstract
The invention discloses a kind of non-timber class natural color pulp food wrapper and preparation method thereof, a kind of non-timber class natural color pulp food wrapper of the present invention, the slurry of the non-timber class natural color pulp food wrapper is made by not floating straw pulp and not floating bamboo pulp, wherein the quantification of 45g/m of the wrapping paper2‑65g/m2, the content of synthesis paper making additive is 0.5% the 2.5% of the oven dry stock.Safety and environmental protection of the present invention, keeps the natural gray of string, dustless chipless, and harmful substance is not produced in papermaking process, reduces the cost of wastewater treatment, production cost is low.
Description
Technical field
The present invention relates to paper manufacturing technology field, and in particular to a kind of non-timber class natural color pulp food wrapper and its system
Preparation Method.
Background technology
In recent years, with growing interest of the people to environmental issues such as " white pollutions ", papery is packaged in packaging for foodstuff neck
The demand and advantage in domain are more and more obvious.Some are national in the world, and packaged food disables polybag without exception, and promotion uses paper products
Carry out green package.There is data, it is expected that China's paper-packed products yield is reachable 36,000,000 tons by 2015.Paper products environmental protection is defended
It is raw, harmless nontoxic, but raw material are possible to be contaminated during production wrapping paper, or in working process, paper and cardboard
In generally have the various functions type auxiliary agent added in some impurity, bacterium and production process：It is oil-proofing agent, fluorescent whitening agent, wet
Strong agent, defoamer etc., many paper products also contain regenerated fiber, and regenerated fiber is in addition to containing above-mentioned harmful components, also containing in ink
Various chemical noxious materials, these residual contaminants are possible to move in food, so as to endanger the health of consumer.
At present, more use contents higher wood pulp or 100% wood pulp are prepared on food wrapper in the prior art
For raw material, in addition, consumer be in it is psychological to brightness the need for and to the demand of some physical indexs, generally use to float
Pulp manufacture based on whitewood's slurry.But timber resources is is saved in some paper mills both at home and abroad, when preparing food wrapper,
Wood pulp is substituted using straw pulp, to reduce cost, but paper performance is often sacrificed.And either straw pulp or wood pulp,
Paper making raw material is used as using bleach chemical pulp.Paper pulp will produce the chemical substance of environmental pollution by bleaching process, can also make
Contain the chemical composition to human health into paper product.
Patent CN101638863A discloses a kind of natural color food wrapper and preparation method thereof, to make properties and having
Evil material index reaches practical level, is added in straw pulp is not floated and does not float wood pulp.Patent CN104452467A discloses a kind of thin
Type natural color food wrapper and preparation method thereof, wood pulp is added in straw pulp is not floated, to make every quality index reach practical journey
Degree, adds starch in slurry, dispersant, alkyl ketene dimer and drying cylinder remover in slurry in preparation process into paper pulp.
Patent CN101353873A discloses a kind of food wrapper and preparation method thereof as made from grass pulp, to save timber money
Source, paper pulp raw material is all using the grass pulp without bleaching.However, prior art emphasis point is single, wherein described paper pulp has
It is a bit bleached pulp, in addition, described does not float the part that straw pulp is merely possible to paper pulp raw material, being combined with the paper pulp such as wood pulp makes
With, but wood pulp can not effectively improve the property indices of paper.
Up to the present, not yet find to use not float bamboo pulp and be added to not floating in straw pulp, and the food wrapper
Quality reaches and more than industry and national standard, does not more find to prepare food wrapper process in non-timber class natural color pulp
It is middle to add a kind of special additive.
In long-term working practice, the inventors discovered that, without the bamboo pulp fiber of mashing be added to wheat straw fiber it
Afterwards, under identical defibrination rotating speed, its beating degree is low, but weight in wet base and water retention value are higher than straw pulp；Early stage is beaten, it refers into the anti-tensile of paper
Number, tear index, burst index and folding strength are high compared with straw pulp, are beaten the later stage, lower than straw pulp.Present inventors have further discovered that, with
Chitin is novel and multifunctional paper making additive prepared by primary raw material, is added in brown stock (natural color pulp), can effectively improve paper
The property indices opened.
At present, a kind of non-timber class natural color pulp food wrapper of safety and environmental protection and preparation method thereof is lacked.
The content of the invention
It is an object of the invention to provide a kind of non-timber class natural color pulp food wrapper with safety and environmental protection and its system
Preparation Method.
To reach above-mentioned purpose, present invention employs following technical proposal：A kind of non-timber class natural color pulp food of the present invention
Product wrapping paper, the slurry of the non-timber class natural color pulp food wrapper is made by not floating straw pulp and not floating bamboo pulp, wherein described
The quantification of 45g/m of wrapping paper2-65g/m2, the content of synthesis paper making additive is the 0.5%-2.5% of the oven dry stock.
Further, the brightness of the non-timber class natural color pulp food wrapper is 20%-50%ISO, and tensile index is
22-27Nm/g, tear index is 10.5-12.5mNm2/ g, burst index is 1.2-2.0KPam2/ g, folding strength is 20-
30 times.
Further, the slurry is made up of the following component of percentage by weight：
Straw pulp 30%-50% is not floated,
Bamboo pulp 50%-70% is not floated.
Further, the synthesis paper making additive is chitin derivativ chitosan class paper making additive；The chitin
Derivative chitosan class paper making additive is reinforcing agent, retention agent or sizing agent.As reinforcing agent, contain in its molecular structure contained
There are substantial amounts of hydroxyl and amino, can occur Hydrogenbond with cellulose, fiber is played a part of improving adhesion and built bridge, one
Sizing agent is planted with internal sizing or top sizing from packaging for foodstuff angle to consider, preferably internal sizing agent.
The preparation method of non-timber class natural color pulp food wrapper of the present invention, comprises the following steps：
(1) self-control is not floated straw pulp and does not float bamboo pulp and mixed in stock tank, make slurry uniform；
(2) slurry after mixing passes sequentially through stock tank, low dense fiberizer, straw pulp after decker, concentration and starches tower after kowtowing
With paper machine stock tank, the slurry after being beaten；
(3) sodium hydroxide solution that the chitin after will be clean is 30%-60% with concentration handles 2- at 120-140 DEG C
3h, is washed to after neutrality and is dissolved in 1%-10% acetic acid solutions, obtains chitin derivativ chitosan class paper making additive, described
Chitosan content in chitin derivativ chitosan class paper making additive account for total amount for 1%-10%；
(4) chitin derivativ chitosan class paper making additive made from into slurry obtained by step (2) in addition step (3)
Into header box, make to be well mixed；
(5) by slurry obtained by step (4) on paper machine successively through fan pump, wet end, blanket portion press section, drying section, coil paper
Machine and high-speed cutter post-processing, are made non-timber class natural color pulp food wrapper.
Further, in step (2), mashing is beaten in low dense fiberizer, and defibrination rotating speed is 10000-
20000r/min, beating consistency is less than 10%；Beating degree is 20-40 ° of SR, and weight in wet base is 7-10g, and water retention value is 110-150%；
In step (5), the slurry from header box flow into wet end when online concentration be 0.5%-1.5%, wet end be 50-200 mesh.
Further, in step (5), the speed of the paper machine is 200-400m/min；The slurry is from header box stream
Online concentration when entering wet end is 0.8%-1.2%, and wet end is 50-150 mesh.
Further, in step (5), the speed of the paper machine is 250-350m/min；The slurry is from header box
Wet end when flowing into wet end is 80-150 mesh.
Beneficial effect：Safety and environmental protection of the present invention, the natural gray of holding string, dustless chipless, and in papermaking process
Harmful substance is not produced, the cost of wastewater treatment is reduced, production cost is low.
Compared with prior art, the invention has the advantages that：
(1) will not float straw pulp and do not float bamboo pulp it is well mixed after be beaten, then paper making additive is added, drainage energy
Power is greatly increased, the reduction of the beating degree of slurry, its height of every physical index compared with bamboo pulp into paper.Entirely manufactured paper with pulp on paper machine
Journey is not added with the other harmful substances matter such as any bleaching agent, fluorescer, keeps the natural gray of string, dustless chipless, and copy
Make and harmful substance is not produced in technique, reduce the cost of wastewater treatment, overcome wood of the prior art using higher beating degree
The unilateral opinion combined with straw pulp is starched, equally manufactures paper with pulp out and meets the food wrapper of state quality standard.
(2) cell membrane of wheat straw fiber is relatively thin, is easily broken under the mechanism of mashing, wire-dividing broom purification and fibrillating
Comparatively fast, adhesion is higher between fiber, and adhesion close relation is all higher into paper tensile index and burst index between fiber, but
Be due to wheat straw fiber (straw pulp) average length it is shorter, the tear index and folding strength into paper are very low；Bamboo pulp fiber (bamboo
Slurry) average length it is longer, the tear index and folding strength into paper are higher.Straw pulp will not be floated and not float bamboo pulp by a certain percentage
It is beaten after well mixed so that bamboo pulp fiber isolates microfibre in the wire-dividing broom purification after mashing evenly,
Paper making additive is added again, the slurry drainage capacity finally obtained is greatly increased, the beating degree reduction of slurry, in beating degree
When relatively low, its height of every physical index compared with bamboo pulp into paper.
(3) good biocompatibility of chitin derivativ chitosan, easily biological-degradable, and catabolite nonhazardous；Also have
There are antibiotic property, microbial resistance, to the sequestering of metal ion.The chitosan class papermaking prepared using chitin as raw material is helped
Agent can be as reinforcing agent, retention agent, sizing agent, and production cost is low.
Embodiment
The present invention is further described by following examples, but should be noted that the scope of the present invention is not implemented by these
Any limitation of example.
Embodiment 1
It is of the present invention not float straw pulp and do not float the Application No. that bamboo pulp was submitted for applicant on March 25th, 2016
Paper pulp disclosed in CN201610179306.7, the Chinese patent application of entitled " non-timber class paper pulp ", it is characterized in that will receive
The wheat straw of collection and bamboo are pre-processed respectively, are then sent into one-level separator by conveying equipment, are used 0.6MPa-
3.0MPa vapour cooking 1min-5min, carries out multistage cleaning again after boiling, then carry out separation of solid and liquid and obtain hemicellulose liquid
And solid content；Aqueous slkali is added to the solid content, the boiling 0.5h-1.5h under conditions of 90 DEG C -130 DEG C, boiling is laggard
The secondary separation of solid and liquid of row obtains brown stock (do not float straw pulp and do not float bamboo pulp).Described brown stock K values are less than 5.5, beating degree
For 20-30 ° of SR, weight in wet base is 2-3.5g, and whiteness is less than 44.5 °, and pH value is 7-9, and the cellulose based on solid content gross weight contains
Measure as 90%-97%.
Pulping process of the present invention is the Application No. that applicant submitted on March 25th, 2016
Method disclosed in CN201610176481.0, the Chinese patent application of entitled " pulping process ", it is characterized in that utilizing three elements
The cellulose products that (hemicellulose, cellulose, lignin) isolation technics is obtained carry out slurrying.
Described acrylamide, chitin, sodium hydroxide, acetic acid, potassium peroxydisulfate, reducing agent, chitosan oligosaccharide are commercially available work
Industry product.
The wheat straw of collection and bamboo are pre-processed respectively, then sending into one-level separation by conveying equipment fills
Put, with 1.5MPa vapour cooking 4min, carry out multistage cleaning after boiling again, then carry out separation of solid and liquid and obtain hemicellulose liquid
And solid content；Aqueous slkali is added to the solid content, secondary solid-liquid is carried out after boiling 1.2h, boiling under conditions of 100 DEG C
Isolated brown stock (do not float straw pulp and do not float bamboo pulp).Described brown stock K values are less than 4.5, and beating degree is 25 ° of SR, wet
Weight is 2.5g, and whiteness is less than 35 °, and pH value is 8.0, and the content of cellulose based on solid content gross weight is 93%.
The non-timber class natural color pulp food wrapper preparation process of the present invention is as follows：
(1) bamboo pulp of not floating that straw pulp and percentage by weight are 70% of not floating for being 30% by percentage by weight is carried out in stock tank
Mixing, makes slurry uniform, obtains concentration for 5% slurry.
(2) after stock tank, low dense fiberizer, straw pulp are kowtowed after passing sequentially through decker to slurry obtained by step (1), concentrate
Tower, paper machine stock tank are starched, defibrination rotating speed is 15000r/min, the slurry after being beaten.
(3) chitin after cleaning is handled into 3h at 125 DEG C with 30% NaOH (sodium hydroxide) solution, is washed to neutrality
After be dissolved in 10% acetic acid solution, obtain chitin derivativ chitosan class paper making additive, the chitin derivativ shell gathers
Chitosan content in carbohydrate paper making additive accounts for the 10% of total amount.The chitin derivativ chitosan class paper making additive is applying glue
Agent.
(4) into slurry obtained by step (2), addition paper making additive enters header box, and the content of paper making additive is over dry slurry
1.0%, make to be well mixed, obtain concentration for 1.0% slurry；
(5) it is on 200m/min paper machines, successively through fan pump, 100 mesh wet ends, blanket in rotating speed by slurry obtained by step (4)
Portion's press section, drying section, reel machine, high-speed cutter, post-processing, obtain quantification of 60g/m2Non-timber class natural color pulp food
Wrapping paper.The slurry from header box flow into wet end when online concentration be 1.1%.
Every quality index of described non-timber class natural color pulp food wrapper is as follows：
After mashing of the present invention terminates, the beating degree of gained slurry is 30 ° of SR, and weight in wet base is 8g, and water retention value is
120%.The brightness of gained non-timber class natural color pulp food wrapper of the present invention is 30%ISO, tensile index 24Nm/
G, tear index 11mNm2/ g, burst index 1.5KPam2/ g, folding strength 24 times.
Embodiment 2
The difference of embodiment 2 and embodiment 1 is：
The wheat straw of collection and bamboo are pre-processed respectively, then sending into one-level separation by conveying equipment fills
Put, with 2.5MPa vapour cooking 3min, carry out multistage cleaning after boiling again, then carry out separation of solid and liquid and obtain hemicellulose liquid
And solid content；Aqueous slkali is added to the solid content, secondary solid-liquid point is carried out after boiling 1h, boiling under conditions of 120 DEG C
From obtaining brown stock (do not float straw pulp and do not float bamboo pulp).Described brown stock K values are less than 5.2, and beating degree is 25 ° of SR, weight in wet base
For 3.2g, whiteness is less than 42 °, and pH value is 8.5, and the content of cellulose based on solid content gross weight is 96%.
Non-timber class natural color pulp food wrapper preparation process is as follows：
In step (1), by percentage by weight for 50% do not float straw pulp and 50% bamboo pulp of not floating is mixed in stock tank
Close, make slurry uniform, obtain concentration for 9% slurry.
In step (2), stock tank, low dense defibrination after decker, concentration are passed sequentially through to slurry obtained by step (1)
Slurry tower, paper machine stock tank after machine, straw pulp are kowtowed, defibrination rotating speed is 10000 turns, the slurry after being beaten.
In step (3), the chitin after cleaning is handled into 2h with 50% NaOH (sodium hydroxide) solution at 140 DEG C,
It is washed to after neutrality and is dissolved in 8% acetic acid solution, obtain chitin derivativ chitosan class paper making additive, the chitin spreads out
Chitosan content in biological chitosan class paper making additive account for total amount for 1%.Into slurry obtained by step (2), addition papermaking is helped
Agent enters header box, and content is the 1.0% of over dry slurry, makes to be well mixed, and obtains concentration for 0.5% slurry.The chitin
Derivative chitosan class paper making additive is retention agent.
In step (4), by slurry obtained by step (3) paper machine rotating speed on 200m/min, successively through fan pump, 50
Mesh wet end, blanket portion press section, drying section, reel machine, high-speed cutter, post-processing, obtain quantification of 45g/m2Non-timber class
Natural color pulp food wrapper.
In rotating speed it is on 400m/min paper machines, successively through fan pump, 90 mesh by slurry obtained by step (4) in step (5)
Wet end, blanket portion press section, drying section, reel machine, high-speed cutter, post-processing, obtain quantification of 45g/m2Non-timber class sheet
Mill base food wrapper.The slurry from header box flow into wet end when online concentration be 0.8%.
Every quality index of described non-timber class natural color pulp food wrapper is as follows：
After mashing of the present invention terminates, the beating degree of gained slurry is 20 ° of SR, and weight in wet base is 10g, and water retention value is
150%.
The brightness of non-timber class natural color pulp food wrapper of the present invention is 20%ISO, and tensile index 22Nm/g, tear refers to
Number 12.5mNm2/ g, burst index 1.2KPam2/ g, folding strength 20 times.
Embodiment 3
The difference of embodiment 3 and embodiment 1 is：
A kind of non-timber class natural color pulp food wrapper of the present invention, the slurry of the non-timber class natural color pulp food wrapper
Material is made by not floating straw pulp and not floating bamboo pulp, wherein the quantification of 65g/m of the wrapping paper2, synthesis paper making additive content be
The 2.5% of the oven dry stock.
The slurry is made up of the following component of percentage by weight：
Straw pulp 40% is not floated,
Bamboo pulp 60% is not floated.
The preparation method of non-timber class natural color pulp food wrapper of the present invention, comprises the following steps：
(1) by percentage by weight for 40% do not float straw pulp and 60% bamboo pulp of not floating is mixed in stock tank, make slurry
Uniformly, concentration is obtained for 9% slurry.
In step (2), mashing is beaten in low dense fiberizer, and defibrination rotating speed is 20000 turns, and beating consistency is
Less than 10%；Beating degree is 40 ° of SR, and weight in wet base is 7g, and water retention value is 110%；
In step (3), the chitin concentration after cleaning is handled into 2h for 60% sodium hydroxide solution at 120 DEG C,
It is washed to after neutrality and is dissolved in 1% acetic acid solution, obtain chitin derivativ chitosan class paper making additive, the chitin spreads out
Chitosan content in biological chitosan class paper making additive account for total amount for 8%；Into slurry obtained by step (2), addition papermaking is helped
Agent enters header box, and content is the 1.0% of over dry slurry, makes to be well mixed, and obtains concentration for 0.5% slurry.The chitin
Derivative chitosan class paper making additive is reinforcing agent.
In step (4), the obtained chitin derivativ chitosan in addition step (3) into slurry obtained by step (2)
Class paper making additive enters header box, makes to be well mixed；
In rotating speed it is on 200m/min paper machines, successively through fan pump, 150 by slurry obtained by step (4) in step (5)
Mesh wet end, blanket portion press section, drying section, reel machine, high-speed cutter, post-processing, obtain quantification of 65g/m2Non-timber class
Natural color pulp food wrapper.The slurry from header box flow into wet end when online concentration be 1.2%.
Every quality index of described non-timber class natural color pulp food wrapper is as follows：
The brightness of the non-timber class natural color pulp food wrapper is 50%ISO, and tensile index is 27Nm/g, and tear refers to
Number is 10.5mNm2/ g, burst index is 2.0KPam2/ g, folding strength is 30 times.
Comparative example 1
The difference of comparative example 1 and embodiment 2 is：
Bleaching is carried out to paper pulp using paper pulp made from commercially available wheat straw and bamboo as raw material, and using bleaching agent
Non-timber class bleached pulp food wrapper preparation process is as follows：
It is that 50% bleaching straw pulp and 50% bleached bamboo pulp are mixed in stock tank by percentage by weight in step (1)
Close, make slurry uniform, obtain concentration for 9% slurry.
In step (2), stock tank, low dense defibrination after decker, concentration are passed sequentially through to slurry obtained by step (1)
Slurry tower, paper machine stock tank after machine, straw pulp are kowtowed, defibrination rotating speed is 10000 turns, the slurry after being beaten.
In step (3), the chitin after cleaning is handled into 2h with 50% NaOH (sodium hydroxide) solution at 140 DEG C,
It is washed to after neutrality and is dissolved in 8% acetic acid solution, obtain chitin derivativ chitosan class paper making additive, the chitin spreads out
Chitosan content in biological chitosan class paper making additive account for total amount for 1%.Into slurry obtained by step (2), addition papermaking is helped
Agent enters header box, and content is the 1.0% of over dry slurry, makes to be well mixed, and obtains concentration for 0.5% slurry.The chitin
Derivative chitosan class paper making additive is retention agent.
In step (4), by slurry obtained by step (3) paper machine rotating speed on 200m/min, successively through fan pump,
100 mesh wet ends, blanket portion press section, drying section, reel machine, high-speed cutter, post-processing, obtain quantification of 45g/m2Non-timber
Class natural color pulp food wrapper.
In rotating speed it is on 350m/min paper machines, successively through fan pump, 50 mesh by slurry obtained by step (4) in step (5)
Wet end, blanket portion press section, drying section, reel machine, high-speed cutter, post-processing, obtain quantification of 45g/m2Non-timber class sheet
Mill base food wrapper.The slurry from header box flow into wet end when online concentration be 0.5%.
Every quality index of described non-timber class natural color pulp food wrapper is as follows：
After mashing of the present invention terminates, the beating degree of gained slurry is 30 ° of SR, and weight in wet base is 8g, and water retention value is
135%.
The brightness of non-timber class natural color pulp food wrapper of the present invention is 65%ISO, and tensile index 17Nm/g, tear refers to
Number 9.2mNm2/ g, burst index 1.0KPam2/ g, folding strength 18 times.
Comparative example 2
Comparative example 2 is used as using the food packaging white leaching membrane paper prepared using wood materials that in the market is bought.
The packaging for foodstuff paper product obtained by above example and comparative example carries out physical and chemical index, microbiological indicator and dirt
Angstrom degree test, Qingdao Dong Biao detection services Co., Ltd of testing agency, method of testing using national regulation Beijing Fourth Ring health
121 DEG C of pressure steam sterilizing chemical tracer cards of medical instruments Co., Ltd., Factory production carry out physical and chemical index detection, and microbiological indicator is adopted
GB-4789-84 methods are used, dirt count index is detected by national standard QB/T 4509-2013, the testing result such as institute of table 1
Show.
Table 1
As shown in Table 1, the every quality of non-timber class natural color pulp food wrapper and performance indications prepared using embodiment 2
All meet standard, the food wrapper that better than comparative example 1 bleached pulp prepares suitable with the food wrapper contrast that in the market is bought
Every quality and performance indications.
General principle, principal character and the advantages of the present invention of the present invention has been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the simply explanation described in above-described embodiment and specification is originally
The principle of invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, the present invention
Claimed scope is by appended claims, specification and its equivalent thereof.
Claims (8)
1. a kind of non-timber class natural color pulp food wrapper, it is characterised in that：The non-timber class natural color pulp food wrapper
Slurry is made by not floating straw pulp and not floating bamboo pulp, wherein the quantification of 45g/m of the wrapping paper2-65g/m2, synthesize paper making additive
Content be the oven dry stock 0.5%-2.5%.
2. non-timber class natural color pulp food wrapper according to claim 1, it is characterised in that：The non-timber class true qualities
The brightness for starching food wrapper is 20%-50%ISO, and tensile index is 22-27Nm/g, and tear index is 10.5-
12.5mN·m2/ g, burst index is 1.2-2.0KPam2/ g, folding strength is 20-30 times.
3. non-timber class natural color pulp food wrapper according to claim 1, it is characterised in that：The slurry is by weight hundred
Divide the following component composition of ratio：
Straw pulp 30%-50% is not floated,
Bamboo pulp 50%-70% is not floated.
4. non-timber class natural color pulp food wrapper according to claim 1, it is characterised in that：The synthesis paper making additive
For chitin derivativ chitosan class paper making additive.
5. the preparation method of the non-timber class natural color pulp food wrapper described in any one of Claims 1-4, it is characterised in that bag
Include following steps：
(1) self-control is not floated straw pulp and does not float bamboo pulp and mixed in stock tank, make slurry uniform；
(2) slurry after mixing passes sequentially through stock tank, low dense fiberizer, straw pulp after decker, concentration and starches tower and paper after kowtowing
Machine stock tank, the slurry after being beaten；
(3) sodium hydroxide solution that the chitin after will be clean is 30%-60% with concentration handles 2-3h, water at 120-140 DEG C
It is washed till after neutrality and is dissolved in 1%-10% acetic acid solutions, obtains chitin derivativ chitosan class paper making additive, the crust
Chitosan content in plain derivative chitosan class paper making additive account for total amount for 1%-10%；
(4) into slurry obtained by step (2), obtained chitin derivativ chitosan class paper making additive enters in addition step (3)
Header box, makes to be well mixed；
(5) by slurry obtained by step (4) on paper machine successively through fan pump, wet end, blanket portion press section, drying section, reel machine and
High-speed cutter post-processing, is made non-timber class natural color pulp food wrapper.
6. the preparation method of non-timber class natural color pulp food wrapper according to claim 5, it is characterised in that：In step
(2) in, mashing, be beaten in low dense fiberizer, defibrination rotating speed be 10000-20000r/min, beating consistency for 10% with
Under；Beating degree is 20-40 ° of SR, and weight in wet base is 7-10g, and water retention value is 110-150%；In step (5), the slurry is from a high position
Online concentration when case flows into wet end is 0.5%-1.5%, and wet end is 50-200 mesh.
7. the preparation method of non-timber class natural color pulp food wrapper according to claim 5, it is characterised in that：In step
(5) in, the speed of the paper machine is 200-400m/min；The slurry from header box flow into wet end when online concentration be
0.8%-1.2%, wet end is 50-150 mesh.
8. the preparation method of non-timber class natural color pulp food wrapper according to claim 7, it is characterised in that：In step
(5) in, the speed of the paper machine is 250-350m/min；The slurry from header box flow into wet end when wet end be 80-150
Mesh.
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