CN109537364A - A kind of wrapping paper and its production technology - Google Patents
A kind of wrapping paper and its production technology Download PDFInfo
- Publication number
- CN109537364A CN109537364A CN201910041953.5A CN201910041953A CN109537364A CN 109537364 A CN109537364 A CN 109537364A CN 201910041953 A CN201910041953 A CN 201910041953A CN 109537364 A CN109537364 A CN 109537364A
- Authority
- CN
- China
- Prior art keywords
- parts
- paper
- wrapping paper
- corrugated layer
- pieces
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- D21H27/10—Packing paper
-
- 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
- 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
- D21H19/54—Starch
-
- 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
- D21H21/06—Paper forming aids
- D21H21/12—Defoamers
-
- 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
- D21H21/50—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 form
- D21H21/52—Additives of definite length or shape
- D21H21/54—Additives of definite length or shape being spherical, e.g. microcapsules, beads
Abstract
The present invention discloses a kind of wrapping paper, it includes with two pieces of facial tissue layers and the corrugated layer being arranged between two pieces of facial tissue layers, the corrugated layer is by including that the raw material of following mass parts is made: 40~60 parts of paper pulp, 10~22 parts of montmorillonite powder, 5~13 parts of glass microballoon, 1~3 part of defoaming agent, 2~5 parts of starch, also disclose the production technology of wrapping paper.It is not easy to disconnect in present invention production neutralization use and cracking, dampproof protection against insects, thermal insulation is good.
Description
Technical field
The present invention relates to wrapping paper technical field more particularly to a kind of wrapping paper and its production technologies.
Background technique
Corrugated paper is the plate object being bonded by the corrugated paper of sheet lining and the waveform formed by corrugated roller processing,
It is generally divided into two class of single wall corrugated board and double-layer corrugated cardboard, is divided into according to the size of corrugation: A, five seed type of B, C, E, F.Corrugation
The invention and application of paper have more than 100 years history histories, and at low cost, light weight, processing is easy, intensity is big, printing adaptability sample is excellent
It is good, storage convenient in carrying the advantages that, 80% or more corrugated paper can be used as food or number by reclaiming, corrugated paper
The packaging of code product, relatively environment-friendly, use is relatively broad.
A type corrugation and Type B corrugation are typically used as transport extranal packing box, and beer case is generally made of B is stupefied.The stupefied multi-purpose work of E has
Certain aesthetic and the packed single case for being put into appropriate weight content, F type corrugation and G type corrugation are referred to as minitype corrugation,
It is a kind of very thin corrugation, the disposable packaging container as food such as hamburger, eclair cakes, or it is used as digital phase
The packaging of micro- electric product such as machine, Portable combination audio device and refrigerated product.
And corrugated paper often will appear the case where fracture, cracking during processing, and some corrugated papers are using
A period of time after will appear various problems, this is because the reason of the environment or weather on periphery and caused by, thus can
It all makes troubles to sale, production.
So be badly in need of it is a kind of production and processing and using when be not easy disconnect and cracking, dampproof protection against insects, well-insulated wrapping paper.
Summary of the invention
It is an object of the present invention to be directed to the above-mentioned deficiency of the prior art, proposes that a kind of production neutralizes and be not easy in use
Disconnection and cracking, dampproof protection against insects, well-insulated wrapping paper and its production technology.
The present invention solves its technical problem, the technical solution adopted is that, propose a kind of wrapping paper comprising there are two pieces of faces
Paper layer and the corrugated layer being arranged between two pieces of facial tissue layers, the corrugated layer is by including that the raw material of following mass parts is made:
40~60 parts of paper pulp, 10~22 parts of montmorillonite powder, 5~13 parts of glass microballoon, 1~3 part of defoaming agent, 2~5 parts of starch.
Preferably, the corrugated layer is by including that the raw material of following mass parts is made: 45~55 parts of paper pulp, montmorillonite powder
15~18 parts, 7~10 parts of glass microballoon, 1.5~2.5 parts of defoaming agent, 3~4 parts of starch.
Preferably, the corrugated layer further includes being made of the raw material of following mass parts: 3~8 parts of wormwood powder.
It is made preferably, the wormwood powder crush by blade.One side wormwood has the function of insect prevention antibacterial,
On the other hand it is crushed in wormwood powder addition raw material obtained by blade and is not easy that last finished product is allowed to open than the powder of wormwood pole
It splits, and powder made from wormwood blade is easy water suction in production, montmorillonite has hygroscopicity, in this way when producing dry, covers
De- stone can be preferably combined together with wormwood powder, improved the insect prevention antibacterial action of the two and prevented opening for corrugated layer
It splits.
Preferably, the partial size of the wormwood powder is 80~120 mesh.
Preferably, the glass microballoon is hollow glass micropearl.Hollow glass micropearl have light, low thermally conductive, sound insulation,
The advantages that high dispersive, electrical insulating property and thermal stability are good, while it is isotropic, therefore caused by will not generating because of orientation not
With the inconsistent disadvantage of position shrinking percentage, the dimensionally stable of product ensure that, also can guarantee that not cracking for corrugated layer is not broken.
Preferably, the partial size of the hollow glass micropearl is 50~150 microns.
It is another object of the present invention to provide a kind of wrapping paper production technologies, including following making step:
A), paper pulp, defoaming agent, montmorillonite powder, starch are added in reaction kettle, be first stirred at room temperature mixing 30~
60min stands 5~10min and obtains mixture；
B), glass microballoon is added in reaction kettle, is warming up to 50~65 DEG C when stirring glass microballoon and mixture, is stirred for 30
Taking-up is put into paper machine and is made into paper after~50min；
C), paper progress Corrugator roller is processed into corrugated layer；
D), two pieces of paper layers and corrugated layer are bonded wrapping paper.
Preferably, the glass microballoon is added in reaction kettle after being first to heat to 70~85 DEG C.Glass microballoon is first heated
It is then added in mixture, it can be allowed more preferably to disperse in the mixture, after rapid dispersion, be heated to 50 in subsequent mixtures
At~65 DEG C, mixture uniform temperature can be helped, is not in heating so that certain hot a part of cold situation of certain a part, right
Have the function of in subsequent heating stirring so that agitating and heating is more uniform.
The invention has the following beneficial effects: the corrugated layers for being added to montmorillonite, starch, glass microballoon and producing, no
It but being capable of anti-fracture crack resistence, additionally it is possible to which bacteria mildew-proof is moisture-proof, heat-proof quality is good, goes to contain article with its corrugated paper made
When, one side corrugated paper can save itself for a long time, on the other hand also can protect that breakables are non-friable, perishable articles
It is unlikely to deteriorate.
Specific embodiment
The following is specific embodiments of the present invention, and technical scheme of the present invention will be further described, but the present invention is simultaneously
It is not limited to these embodiments.
Embodiment 1:
A kind of wrapping paper comprising the corrugated layer that there are two pieces of facial tissue layers and be arranged between two pieces of facial tissue layers, described watt
Stupefied layer is by including that the raw material of following mass parts is made: 40 parts of paper pulp, 22 parts of montmorillonite powder, and 5 parts of glass microballoon, 3 parts of defoaming agent,
2 parts of starch.
A kind of wrapping paper production technology, including following making step:
A), paper pulp, defoaming agent, montmorillonite powder, starch are added in reaction kettle, mixing 30min is first stirred at room temperature, it is quiet
It sets 10min and obtains mixture；
B), glass microballoon is added in reaction kettle, is warming up to 65 DEG C when stirring glass microballoon and mixture, is stirred for 30min
Taking-up is put into paper machine and is made into paper afterwards；
C), paper progress Corrugator roller is processed into corrugated layer；
D), two pieces of paper layers and corrugated layer are bonded wrapping paper.
Embodiment 2:
A kind of wrapping paper comprising the corrugated layer that there are two pieces of facial tissue layers and be arranged between two pieces of facial tissue layers, described watt
Stupefied layer is by including that the raw material of following mass parts is made: 60 parts of paper pulp, 10 parts of montmorillonite powder, and 13 parts of hollow glass micropearl, defoaming
1 part of agent, 5 parts of starch, 3 parts of wormwood powder.
The wormwood powder crush by blade and is made, and the partial size of the wormwood powder is 80~120 mesh.
The partial size of the hollow glass micropearl is 50~150 microns.
A kind of wrapping paper production technology, including following making step:
A), paper pulp, defoaming agent, montmorillonite powder, starch are added in reaction kettle, mixing 45min is first stirred at room temperature, it is quiet
It sets 7min and obtains mixture；
B), 70 DEG C of hollow glass micropearl is previously heated to toward the interior addition of reaction kettle, hollow glass micropearl and mixture are stirred in side
While be warming up to 50 DEG C, it is stirred for taking out after 40min and is put into paper machine and is made into paper；
C), paper progress Corrugator roller is processed into corrugated layer；
D), two pieces of paper layers and corrugated layer are bonded wrapping paper.
Embodiment 3:
A kind of wrapping paper comprising the corrugated layer that there are two pieces of facial tissue layers and be arranged between two pieces of facial tissue layers, described watt
Stupefied layer is by including that the raw material of following mass parts is made: 50 parts of paper pulp, 16 parts of montmorillonite powder, and 8 parts of hollow glass micropearl, defoaming agent
2 parts, 3.5 parts of starch, 8 parts of wormwood powder.
The wormwood powder crush by blade and is made, and the partial size of the wormwood powder is 80~120 mesh.
The partial size of the hollow glass micropearl is 50~150 microns.
It is another object of the present invention to provide a kind of wrapping paper production technologies, including following making step:
A), paper pulp, defoaming agent, montmorillonite powder, starch are added in reaction kettle, mixing 45min is first stirred at room temperature, it is quiet
It sets 5min and obtains mixture；
B), 85 DEG C of hollow glass micropearl is previously heated to toward the interior addition of reaction kettle, hollow glass micropearl and mixture are stirred in side
While be warming up to 57 DEG C, it is stirred for taking out after 50min and is put into paper machine and is made into paper；
C), paper progress Corrugator roller is processed into corrugated layer；
D), two pieces of paper layers and corrugated layer are bonded wrapping paper.
Embodiment 4:
A kind of wrapping paper comprising the corrugated layer that there are two pieces of facial tissue layers and be arranged between two pieces of facial tissue layers, described watt
Stupefied layer is by including that the raw material of following mass parts is made: 45 parts of paper pulp, 18 parts of montmorillonite powder, and 7 parts of hollow glass micropearl, defoaming agent
1.5 parts, 3 parts of starch, 5 parts of wormwood powder.
The wormwood powder crush by blade and is made, and the partial size of the wormwood powder is 80~120 mesh.
The partial size of the hollow glass micropearl is 50~150 microns.
A kind of wrapping paper production technology, including following making step:
A), paper pulp, defoaming agent, montmorillonite powder, starch are added in reaction kettle, mixing 45min is first stirred at room temperature, it is quiet
It sets 7min and obtains mixture；
B), 70 DEG C of hollow glass micropearl is previously heated to toward the interior addition of reaction kettle, hollow glass micropearl and mixture are stirred in side
While be warming up to 50 DEG C, it is stirred for taking out after 40min and is put into paper machine and is made into paper；
C), paper progress Corrugator roller is processed into corrugated layer；
D), two pieces of paper layers and corrugated layer are bonded wrapping paper.
Embodiment 5:
A kind of wrapping paper comprising the corrugated layer that there are two pieces of facial tissue layers and be arranged between two pieces of facial tissue layers, described watt
Stupefied layer is by including that the raw material of following mass parts is made: 55 parts of paper pulp, 15 parts of montmorillonite powder, and 10 parts of hollow glass micropearl, defoaming
2.5 parts of agent, 4 parts of starch, 6 parts of wormwood powder.
The wormwood powder crush by blade and is made, and the partial size of the wormwood powder is 80~120 mesh.
The partial size of the hollow glass micropearl is 50~150 microns.
It is another object of the present invention to provide a kind of wrapping paper production technologies, including following making step:
A), paper pulp, defoaming agent, montmorillonite powder, starch are added in reaction kettle, mixing 45min is first stirred at room temperature, it is quiet
It sets 5min and obtains mixture；
B), 85 DEG C of hollow glass micropearl is previously heated to toward the interior addition of reaction kettle, hollow glass micropearl and mixture are stirred in side
While be warming up to 57 DEG C, it is stirred for taking out after 50min and is put into paper machine and is made into paper；
C), paper progress Corrugator roller is processed into corrugated layer；
D), two pieces of paper layers and corrugated layer are bonded wrapping paper.
Comparative example 1:
A kind of wrapping paper comprising the corrugated layer that there are two pieces of facial tissue layers and be arranged between two pieces of facial tissue layers, described watt
Stupefied layer is by including that the raw material of following mass parts is made: 40 parts of paper pulp, 22 parts of montmorillonite powder, and 3 parts of defoaming agent, 2 parts of starch.
A kind of wrapping paper production technology, including following making step:
A), paper pulp, defoaming agent, montmorillonite powder, starch are added in reaction kettle, after mixing 30min is first stirred at room temperature
Taking-up is put into paper machine and is made into paper；
B), paper progress Corrugator roller is processed into corrugated layer；
C), two pieces of paper layers and corrugated layer are bonded wrapping paper.
Comparative example 2:
A kind of wrapping paper comprising the corrugated layer that there are two pieces of facial tissue layers and be arranged between two pieces of facial tissue layers, described watt
Stupefied layer is by including that the raw material of following mass parts is made: 55 parts of paper pulp, 15 parts of montmorillonite powder, and 10 parts of hollow glass micropearl, defoaming
2.5 parts of agent, 4 parts of starch, 6 parts of wormwood powder.
The wormwood powder crush by wormwood stem and is made, and the partial size of the wormwood powder is 80~120 mesh.
The partial size of the hollow glass micropearl is 50~150 microns.
It is another object of the present invention to provide a kind of wrapping paper production technologies, including following making step:
A), paper pulp, defoaming agent, montmorillonite powder, starch are added in reaction kettle, mixing 45min is first stirred at room temperature, it is quiet
It sets 5min and obtains mixture；
B), 85 DEG C of hollow glass micropearl is previously heated to toward the interior addition of reaction kettle, hollow glass micropearl and mixture are stirred in side
While be warming up to 57 DEG C, it is stirred for taking out after 50min and is put into paper machine and is made into paper；
C), paper progress Corrugator roller is processed into corrugated layer；
D), two pieces of paper layers and corrugated layer are bonded wrapping paper.
Comparative example 3:
A kind of wrapping paper comprising the corrugated layer that there are two pieces of facial tissue layers and be arranged between two pieces of facial tissue layers, described watt
Stupefied layer is by including that the raw material of following mass parts is made: 70 parts of paper pulp, 18 parts of montmorillonite powder, and 7 parts of hollow glass micropearl, defoaming agent
1.5 parts, 3 parts of starch, 5 parts of wormwood powder.
The wormwood powder crush by blade and is made, and the partial size of the wormwood powder is 80~120 mesh.
The partial size of the hollow glass micropearl is 50~150 microns.
A kind of wrapping paper production technology, including following making step:
A), paper pulp, defoaming agent, montmorillonite powder, starch are added in reaction kettle, mixing 45min is first stirred at room temperature, it is quiet
It sets 7min and obtains mixture；
B), 100 DEG C of hollow glass micropearl is previously heated to toward the interior addition of reaction kettle, hollow glass micropearl and mixture are stirred in side
While be warming up to 50 DEG C, it is stirred for taking out after 40min and is put into paper machine and is made into paper；
C), paper progress Corrugator roller is processed into corrugated layer；
D), two pieces of paper layers and corrugated layer are bonded wrapping paper.
Break by corrugated layer in wrapping paper made from above-described embodiment 1-5 and comparative example 1-3, being produced to it
It opens, crack and the disconnection in use, the detection of cracking, the fragmentation situation of breakables built in wrapping paper and built-in perishable object
The detection of the deterioration of product, as shown in the table.
The detection of disconnection, cracking in use, by applying to it weight 5 minutes of 10kg, the observation period disconnects and cracking
Probability.
The fragmentation situation of fragile article is all made of and glass is packed into carton made of thus wrapping paper, and glass is same
Deng packaging, then the height by carton from 2 meters is fallen, and observes the probability of fragmentation.
The deterioration of perishable articles is all made of and bean curd is put into carton made of thus wrapping paper, by its 25 DEG C
In environment, the rotten time needed is detected.
As can be seen from the above table, not easy to break in production and in use using wrapping paper made of embodiment 1-5
Not easy to crack, protection fragile article and perishable articles are better than wrapping paper made of comparative example 1-3.
Specific embodiment described herein is only an example for the spirit of the invention.The neck of technology belonging to the present invention
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Claims (9)
1. a kind of wrapping paper, it is characterised in that: including with two pieces of facial tissue layers and watt being arranged between two pieces of facial tissue layers
Stupefied layer, the corrugated layer is by including that the raw material of following mass parts is made: 40~60 parts of paper pulp, 10~22 parts of montmorillonite powder, glass
5~13 parts of glass microballon, 1~3 part of defoaming agent, 2~5 parts of starch.
2. a kind of wrapping paper according to claim 1, it is characterised in that: the corrugated layer is by the original including following mass parts
Material is made: 45~55 parts of paper pulp, 15~18 parts of montmorillonite powder, and 7~10 parts of glass microballoon, 1.5~2.5 parts of defoaming agent, starch 3
~4 parts.
3. a kind of wrapping paper according to claim 1, it is characterised in that: the corrugated layer further includes by following mass parts
Raw material is made: 3~8 parts of wormwood powder.
4. a kind of wrapping paper according to claim 3, it is characterised in that: the wormwood powder carries out crushing system by blade
?.
5. a kind of wrapping paper according to claim 4, it is characterised in that: the partial size of the wormwood powder is 80~120 mesh.
6. a kind of wrapping paper according to claim 1, it is characterised in that: the glass microballoon is hollow glass micropearl.
7. a kind of wrapping paper according to claim 6, it is characterised in that: the partial size of the hollow glass micropearl be 50~
150 microns.
8. a kind of wrapping paper production technology as described in claim 1, which is characterized in that including following making step:
A), paper pulp, defoaming agent, montmorillonite powder, starch are added in reaction kettle, be first stirred at room temperature mixing 30~
60min stands 5~10min and obtains mixture；
B), glass microballoon is added in reaction kettle, is warming up to 50~65 DEG C when stirring glass microballoon and mixture, is stirred for 30
Taking-up is put into paper machine and is made into paper after~50min；
C), paper progress Corrugator roller is processed into corrugated layer；
D), two pieces of paper layers and corrugated layer are bonded wrapping paper.
9. a kind of wrapping paper manufacture craft according to claim 8, it is characterised in that: the glass microballoon is first to heat to 70
It is added in reaction kettle after~85 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910041953.5A CN109537364A (en) | 2019-01-17 | 2019-01-17 | A kind of wrapping paper and its production technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910041953.5A CN109537364A (en) | 2019-01-17 | 2019-01-17 | A kind of wrapping paper and its production technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109537364A true CN109537364A (en) | 2019-03-29 |
Family
ID=65835614
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910041953.5A Pending CN109537364A (en) | 2019-01-17 | 2019-01-17 | A kind of wrapping paper and its production technology |
Country Status (1)
| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111849236A (en) * | 2020-08-25 | 2020-10-30 | 三棵树涂料股份有限公司 | Environment-friendly anti-cracking antiviral flexible putty powder and preparation method thereof |
| CN114232376A (en) * | 2021-12-21 | 2022-03-25 | 王伟夫 | Insect-proof packing paper and preparation method thereof |
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| CN102561100A (en) * | 2010-12-21 | 2012-07-11 | 浙江森林环保科技有限公司 | Formula for sludge corrugated base paper, production process and produced corrugated board |
| CN103465553A (en) * | 2013-07-31 | 2013-12-25 | 昆山好利达包装有限公司 | Honeycomb paper |
| CN106320055A (en) * | 2016-08-29 | 2017-01-11 | 苏州市炫之彩包装有限公司 | Formula of environment-friendly packaging box |
| CN106378966A (en) * | 2016-11-28 | 2017-02-08 | 重庆睿容环保科技有限公司 | Sludge recycling method |
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2019
- 2019-01-17 CN CN201910041953.5A patent/CN109537364A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102561100A (en) * | 2010-12-21 | 2012-07-11 | 浙江森林环保科技有限公司 | Formula for sludge corrugated base paper, production process and produced corrugated board |
| CN103465553A (en) * | 2013-07-31 | 2013-12-25 | 昆山好利达包装有限公司 | Honeycomb paper |
| CN106320055A (en) * | 2016-08-29 | 2017-01-11 | 苏州市炫之彩包装有限公司 | Formula of environment-friendly packaging box |
| CN106378966A (en) * | 2016-11-28 | 2017-02-08 | 重庆睿容环保科技有限公司 | Sludge recycling method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111849236A (en) * | 2020-08-25 | 2020-10-30 | 三棵树涂料股份有限公司 | Environment-friendly anti-cracking antiviral flexible putty powder and preparation method thereof |
| CN114232376A (en) * | 2021-12-21 | 2022-03-25 | 王伟夫 | Insect-proof packing paper and preparation method thereof |
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