CN110774516B - Preparation method of comfortable carbon paper holder - Google Patents
Preparation method of comfortable carbon paper holder Download PDFInfo
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- CN110774516B CN110774516B CN201911035565.2A CN201911035565A CN110774516B CN 110774516 B CN110774516 B CN 110774516B CN 201911035565 A CN201911035565 A CN 201911035565A CN 110774516 B CN110774516 B CN 110774516B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 9
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 9
- 229920001971 elastomer Polymers 0.000 claims abstract description 27
- 229920003023 plastic Polymers 0.000 claims abstract description 19
- 239000004033 plastic Substances 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 18
- 238000002347 injection Methods 0.000 claims abstract description 14
- 239000007924 injection Substances 0.000 claims abstract description 14
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 12
- 229920001903 high density polyethylene Polymers 0.000 claims abstract description 11
- 239000004700 high-density polyethylene Substances 0.000 claims abstract description 11
- 238000013329 compounding Methods 0.000 claims abstract description 10
- 229920002943 EPDM rubber Polymers 0.000 claims abstract description 9
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 239000011347 resin Substances 0.000 claims abstract description 6
- 229920005989 resin Polymers 0.000 claims abstract description 6
- 238000005469 granulation Methods 0.000 claims description 2
- 230000003179 granulation Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 abstract description 2
- KEQFTVQCIQJIQW-UHFFFAOYSA-N N-Phenyl-2-naphthylamine Chemical compound C=1C=C2C=CC=CC2=CC=1NC1=CC=CC=C1 KEQFTVQCIQJIQW-UHFFFAOYSA-N 0.000 description 4
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N zinc oxide Inorganic materials [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- PGNWIWKMXVDXHP-UHFFFAOYSA-L zinc;1,3-benzothiazole-2-thiolate Chemical compound [Zn+2].C1=CC=C2SC([S-])=NC2=C1.C1=CC=C2SC([S-])=NC2=C1 PGNWIWKMXVDXHP-UHFFFAOYSA-L 0.000 description 2
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 235000019658 bitter taste Nutrition 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 208000002173 dizziness Diseases 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229920002725 thermoplastic elastomer Polymers 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/78—Measuring, controlling or regulating of temperature
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/02—Organic and inorganic ingredients
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/17—Amines; Quaternary ammonium compounds
- C08K5/18—Amines; Quaternary ammonium compounds with aromatically bound amino groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
- C08K5/45—Heterocyclic compounds having sulfur in the ring
- C08K5/46—Heterocyclic compounds having sulfur in the ring with oxygen or nitrogen in the ring
- C08K5/47—Thiazoles
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76531—Temperature
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a preparation method of a comfortable carbon paper, which comprises the following steps: mixing ethylene propylene diene monomer and compounding agent uniformly, adding high-density polyethylene resin and auxiliary agent into a high-speed mixer, mixing uniformly, extruding and granulating, and finally adding the two materials into a double-component double-flow-channel injection machine, wherein the temperature of a rubber flow channel is 70 ℃, and the length of the rubber flow channel is 0.4 m. The plastic runner is 160 ℃ in temperature and 0.5 m in length, the two runner heads are perpendicular to the ground and downwards form an angle of 45 degrees, the plastic runner is injected into a die cavity of a die with a zigzag meshing structure, the temperature of the die cavity is 150 ℃, and the forming time is 8 minutes. The pen holder is simple in process and high in production efficiency, and solves the problems of discomfort, low durability, time waste and the like of the traditional pen holder. The comfortable carbon paper pen holder has the lowest tensile strength of 20.8 and the wear resistance of 0.14cm3/1.61km。
Description
Technical Field
The invention relates to the field of stationery for study and office, in particular to a method for preparing a comfortable carbon paper.
Background
The pen is a stationery which is most used by people in life, is a portable stationery, is convenient to use, is light in weight and low in price, can record information or leave marks on any occasion, and is widely used by people. However, when a large amount of characters are repeatedly written by hands, the arms and eyes can be sore when the user writes for a long time, and the work efficiency is affected by dizziness. Although the society is developing with the continuous progress of science and technology, and the printing technology accompanied with computers can solve the problems, the society still has a great number of handwriting workers, and handwriting cannot be replaced.
At present, in order to solve the problem, the most effective method is to use a pen holder, most of the pen holders in domestic market are made of thermoplastic elastomer materials, the surface of the pen holder has many small points, and the finger ache caused by long-time writing can be relieved to a certain extent, so that the problem of increasing the writing speed is solved, but if a plurality of characters are repeatedly written for a long time, much time is still spent, and the pen holder is extremely easy to damage.
Therefore, the invention is a method for preparing a comfortable duplicating pen holder, which aims to solve the problem of time waste caused by long-time mass duplication, and designs a method for preparing a duplicating pen holder which can combine a plurality of pens and can be used simultaneously from the root, so that single-character duplication can be carried out on one piece of paper, and quick writing can be carried out on a plurality of pieces of paper simultaneously, and a large amount of duplication can be realized in a short time.
Disclosure of Invention
The invention aims to solve the technical problems that a large amount of duplications are inconvenient for a long time and the pen holder is easy to fatigue and damage after being used for a long time, and provides a preparation method of the pen holder which saves time, is firm and durable and has the duplications function. The technical scheme adopted by the invention is as follows: a preparation method of a comfortable carbon paper comprises the following steps: (1) uniformly mixing ethylene propylene diene monomer and a compounding agent for later use; (2) adding the high-density polyethylene resin and the auxiliary agent into a high-speed mixer, uniformly mixing, and then adding into an extruder for granulation; (3) and (3) respectively adding the two materials prepared in the step (1) and the step (2) into a charging barrel of a two-component double-flow-channel injection machine, and injecting the materials into a closed die to obtain a product.
As a preferred technical scheme: the hand-held column part consists of 100 parts of ethylene propylene diene monomer and 43 parts of compounding agent according to mass ratio. Wherein the compounding agent consists of white carbon black, 2-mercaptobenzothiazole, zinc oxide, dicumyl peroxide and N-phenyl-2-naphthylamine according to the mass ratio of 10: 3.5: 5: 10: 4.5. The bracket part consists of high-density polyethylene and an auxiliary agent, the mass part ratio of the high-density polyethylene resin to the auxiliary agent is 60: 40, and the auxiliary agent consists of a modifier, a plasticizer, a lubricant, an antistatic agent, an antioxidant and an anti-aging agent according to the mass ratio of 10: 12: 9: 2: 3: 4.
The material adopted by the invention is rubber and plastic which are combined and is different from single-component resin material on the market, wherein the hand-held part adopts the ethylene propylene diene monomer rubber which has certain elasticity, so that the fingers are more comfortable and the fatigue of a user is relieved; the high-density polyethylene is selected at the base, the pen is firmly clamped, and the price is low.
In the preparation method, a bi-component double-flow-channel injection machine is adopted, rubber and plastic are injected at the same time, and the rubber and the plastic are processed and formed in one step instead of the traditional two-step processing and forming method, the traditional two-step processing and forming method comprises injection molding and then rubber injection, and the feeding mode is easy to cause the product to have cracks in the joint area of the contact surface of the rubber and the plastic, so that the service life is shortened, and the production efficiency is reduced. And rubber and plastic are injected simultaneously by adopting a double-component double-flow-channel runner injection machine and are injected into a mould for forming, so that the time is saved, and the connection degree of the rubber and the plastic is increased.
The two-component double-flow-channel injection machine adopted by the invention is provided with two flow channels, namely a rubber flow channel and a plastic flow channel, wherein the temperature of the rubber flow channel is 70 ℃, the length of the rubber flow channel is 0.4 m, the injection process is carried out at a low temperature because the rubber can generate cross-linking at a high temperature, and the time of the rubber in the flow channel is increased due to the overlong length of the rubber flow channel, so that the injection is not facilitated. The plastic runner is too high in temperature to cause material decomposition, and too low in temperature to cause the material to be difficult to flow and block the machine, so the runner temperature is 160 ℃, the length is 0.5 meter, the temperature difference between the two runners is large, the two runners are positioned at two sides of the machine body, and the machine heads of the two runners are vertical to the ground and downwards form a structure with an angle of 45 degrees, so that the material injection is easier. The mold temperature was 150 ℃ and the molding time was 8 minutes. Not only can solidify and form the two materials, but also does not influence the performance
The comfortable carbon paper pen holder has the following advantages:
(1) the hand-held column consists of a hand-held column part and a bracket part, wherein the hand-held column part consists of ethylene propylene diene monomer and a compounding agent, and the bracket part consists of high-density polyethylene, so that the hand-held column is rich in elasticity, can meet the requirement of comfort level, has very high mechanical strength, and is firm and durable.
(2) The pen holder is contacted with fingers for a long time, the fingers can be stained with colors by using a colored compounding agent, and the common sulfur and bitter taste are mainly considered for a vulcanizing agent selected from dicumyl peroxide, so that the body health of a user is influenced, so that the compounding agent is preferably composed of white carbon black, 2-mercaptobenzothiazole, zinc oxide, dicumyl peroxide and N-phenyl-2-naphthylamine by taking 100 parts of ethylene propylene diene monomer as a reference, and the mass ratio is 20: 3.5: 5: 10: 4.5, so that the product is clean and attractive.
(3) Because the high density polyethylene has a very low melt index and a very high viscosity, it is not easy to process. The invention adds the auxiliary agent to improve the fluidity of the high-density polyethylene, is convenient for injection molding, reduces the defective rate and improves the heat-resistant aging performance
(4) The adopted double-component double-flow-channel injection machine can feed materials simultaneously, so that the processing is easier, and the injection efficiency can be improved. The rubber runner temperature is 70 ℃, and the length is 0.4 m. The plastic flow channel has the temperature of 160 ℃, the length of 0.5 m, the two flow channel heads are vertical to the ground and form an angle of 45 degrees downwards, and materials can easily flow and be injected in the flow channel.
(5) The two parts of splicing dies are adopted, and the interface is of a sawtooth-shaped meshing structure, so that rubber and plastic can be better connected. The temperature of the mould is 150 ℃, the two materials can be solidified and molded without affecting the performance, the closing time of the mould is 8 minutes, the two materials are fully combined, and the performance is better.
Drawings
FIG. 1 is a shape chart of a novel pen holder for a refill, wherein the novel pen holder is 300mm long, 300mm wide, 50mm thick on a base, 10mm in radius of pen holes and 10mm in clearance between the pen holes and used for fixing the refill, so that the refill is not easy to fall off; the length of the hand holding part is 100mm, the diameter is 10mm, and the writing and the use are convenient.
Detailed Description
The present invention will be further described in detail with reference to the following examples.
Example 1
Uniformly mixing ethylene propylene diene monomer and 43 parts of compounding agent, drying high-density polyethylene, adding into an extruder, and granulating by a granulator. And finally, respectively adding the two-component materials into a charging barrel of a two-component double-flow-passage injection machine, wherein the length of a rubber flow passage is 0.4 meter, the temperature is 70 ℃, the length of a plastic flow passage is 0.5 meter, the temperature is 160 ℃, the two-component materials are injected into a serrated occlusion type mold cavity with the temperature of 150 ℃ through a 45-degree machine head, and the molded product is taken out after the mold is closed for 8 minutes.
The preparation methods of examples 2 to 5 are the same as those of example 1, and the process conditions are as follows:
example 2
This embodiment differs from example 1 in that: in embodiment 2, the rubber runner is 0.6 m long at 100 ℃, the plastic runner is 0.5 m long at 160 ℃, and the rubber runner is injected into a mold with a temperature of 150 ℃ through a 45-degree angle machine head, and the mold is closed for 8 minutes.
Example 3
This embodiment differs from example 1-2 in that: in embodiment 3, the rubber runner is 0.4 m long at 70 deg.c, the plastic runner is 0.3 m long at 100 deg.c, and the rubber runner is injected through a 45 deg.c head into a mold at 150 deg.c and the mold is closed for 8 min.
Example 4
This embodiment differs from examples 1-3 in that: in embodiment 4, the rubber runner is 0.4 m long at 70 ℃, the plastic runner is 0.5 m long at 160 ℃, and the rubber runner is injected into a mold with a temperature of 150 ℃ through a 90-degree angle head, and the mold is closed for 8 minutes.
Example 5
This embodiment differs from examples 1-4 in that: in embodiment 5, the rubber runner is 0.4 m long at 70 deg.c, the plastic runner is 0.5 m long at 160 deg.c, and the rubber runner is injected into the mold at 160 deg.c via a 45 deg. head and the mold is closed for 15 min.
The performance data for the pad portions of examples 1-5 are shown in Table 1. As can be seen from the table 1, the elasticity and the comfort of the comfortable duplicating pen holder prepared by the method are superior to those of the pen holders sold in the market, the pen holders are more durable while providing comfort due to the special processing mode, and the novel pen holder prepared by the preparation method can be used for a long time and is not easy to cause fatigue. Compared with a single-component pen holder, the pen holder manufactured by adopting a double-component double-flow-passage injection molding method is more comfortable and durable.
TABLE 1 Properties of examples 1-5 receptacles
Claims (1)
1. A preparation method of a comfortable carbon paper is characterized by comprising the following steps: the pen holder consists of a hand-held column and a bracket, and the preparation method comprises the following steps: (1) uniformly mixing ethylene propylene diene monomer and a compounding agent for later use; (2) adding the high-density polyethylene resin and the auxiliary agent into a high-speed mixer, uniformly mixing, and then adding into an extruder for granulation; (3) respectively adding the two materials prepared in the step (1) and the step (2) into a charging barrel of a two-component double-flow-channel injection machine, and injecting the two materials into a closed die to obtain a firm and durable carbon pen holder with a plurality of pen holes; the hand-held column part consists of ethylene propylene diene monomer rubber and a compounding agent, and the hand-held column is 100mm long and 10mm in diameter; the bracket part consists of high-density polyethylene resin and an auxiliary agent, and the bracket is 300mm long and 300mm wide, the base is 50mm thick, the radius of the pen hole is 10mm, and the gap between the pen holes is 10 mm; wherein the rubber runner of the double-component double-runner injection machine used in the step (3) has the temperature of 70 ℃ and the length of 0.4 meter; the temperature of the plastic runner is 160 ℃, the length of the plastic runner is 0.5 m, and the heads of the two runners are downward at an angle of 45 degrees; the die is a two-part splicing die, a sawtooth-shaped meshing structure is arranged at an interface, the temperature of the die is 150 ℃, and the closing time is 8 minutes.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911035565.2A CN110774516B (en) | 2019-10-22 | 2019-10-22 | Preparation method of comfortable carbon paper holder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911035565.2A CN110774516B (en) | 2019-10-22 | 2019-10-22 | Preparation method of comfortable carbon paper holder |
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| CN110774516A CN110774516A (en) | 2020-02-11 |
| CN110774516B true CN110774516B (en) | 2021-07-20 |
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2019
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| CN106750822A (en) * | 2017-01-18 | 2017-05-31 | 山东聚辰电缆有限公司 | A kind of low temperature resistant oversheath for power cable |
| CN208530066U (en) * | 2017-10-20 | 2019-02-22 | 林刚 | A kind of appliance for holding pen |
| CN109203406A (en) * | 2018-09-10 | 2019-01-15 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of preparation facilities and preparation method of high voltage direct current valve tower branch water pipe sheath |
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| CN110774516A (en) | 2020-02-11 |
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