CN107934376A - Fabric core conveyor belt and preparation method thereof - Google Patents
Fabric core conveyor belt and preparation method thereof Download PDFInfo
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- CN107934376A CN107934376A CN201711178566.3A CN201711178566A CN107934376A CN 107934376 A CN107934376 A CN 107934376A CN 201711178566 A CN201711178566 A CN 201711178566A CN 107934376 A CN107934376 A CN 107934376A
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- rubber cover
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- conveyor belt
- impregnation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
- B65G15/30—Belts or like endless load-carriers
- B65G15/32—Belts or like endless load-carriers made of rubber or plastics
- B65G15/34—Belts or like endless load-carriers made of rubber or plastics with reinforcing layers, e.g. of fabric
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08L9/06—Copolymers with styrene
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/693—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with natural or synthetic rubber, or derivatives thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/16—Synthetic fibres, other than mineral fibres
- D06M2101/30—Synthetic polymers consisting of macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M2101/32—Polyesters
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/16—Synthetic fibres, other than mineral fibres
- D06M2101/30—Synthetic polymers consisting of macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M2101/34—Polyamides
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/16—Synthetic fibres, other than mineral fibres
- D06M2101/30—Synthetic polymers consisting of macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M2101/34—Polyamides
- D06M2101/36—Aromatic polyamides
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Belt Conveyors (AREA)
- Reinforced Plastic Materials (AREA)
Abstract
The invention discloses fabric core conveyor belt and preparation method thereof, fabric core conveyor belt, including upper rubber cover and lower rubber cover；At least one layer of fabric sandwich layer is provided between upper rubber cover and lower rubber cover；Binded after fabric sandwich layer impregnation material with upper rubber cover and lower rubber cover；Fabric sandwich layer is and the connection warp being connected between main warp and weft directly through straight latitude structure, including main warp line, weft；Fabric sandwich layer good integrity, simple production process, is not easy to be layered, and is produced easy to impregnation, excellent shock resistance；The preparation method of fabric core conveyor belt, including following procedure of processing：Step 1: slurrying；Step 2: impregnation；Step 3: rubberizing, vulcanization；Using rational preparation method, combine rubber cover and the new of sizing material is formulated so that fabric core conveyor belt has good cement properties and fatigue performance, structural strength is high, wear-resisting, corrosion resistance and good, and reduces the use cost of equipment, resource has been saved, has improved production efficiency.
Description
Technical field
The present invention relates to fabric core conveyor belt technical field, is grown in particular to a kind of structural strength height, service life
Fabric core conveyor belt and preparation method thereof.
Background technology
Fabric core conveyor belt is essential instrument in materials handling industries such as mine, power plant, coal, harbours, its is defeated
The continuity and high efficiency sent are played a great role；Fabric core conveyor belt is acted in operation process by material, with conveyer
Long-time contact, the friction of carrying roller, material, cause conveyer belt coating rubber not wear-resisting, easy to fall off, cause maintenance frequent, the longevity
Order short, thus operating cost is higher, while the fabric core conveyor belt scrapped cannot be used again；Therefore extend fabric core conveyor belt to use
Service life, it is possible to reduce material transportation cost, reduce energy usage amount, save energy and protect environment, be China's economic development
Direction；The frame structure material of traditional fabric core conveyor belt is canvas, and processing method is mixing → calendering → shaping → vulcanization,
Structural strength is low, wear-resisting, poor corrosion resistance, and impact resistance is poor, and equipment investment is of high cost.
The content of the invention
Fabric core conveyor belt grown it is an object of the present invention to provide a kind of structural strength height, service life and preparation method thereof,
Solves above technical problem.
In order to realize above-mentioned technical purpose, reach above-mentioned technical requirements, the technical solution adopted in the present invention is：Fabric
Core conveyer belt, including upper rubber cover and lower rubber cover；At least one layer is provided between the upper rubber cover and lower rubber cover to knit
Thing sandwich layer；Binded after the fabric sandwich layer impregnation material with upper rubber cover and lower rubber cover；It is characterized in that：The fabric sandwich layer
For directly through straight latitude structure, including main warp line, weft, and the connection warp being connected between main warp and weft.
As preferable technical solution：The fabric sandwich layer is 1 layer either 2 layers or 3 layers.
As preferable technical solution：It is vertically arranged between the main warp and weft.
As preferable technical solution：The weft is symmetricly set on main warp line both sides.
As preferable technical solution：The main warp line is HMLS Polyester, aramid fiber industrial filament；The weft
Using polyamide fibre 6 or the industrial filament of polyamide fibre 66；The connection warp uses polyamide fibre or polyester industrial filament yarn.
The preparation method of fabric core conveyor belt, it is characterized in that：Including following procedure of processing：
Step 1: slurrying；Prepare rubber cover and sizing material；
The rubber cover is by weight component meter：40-65 parts of Afpol, 8-15 parts of butadiene-styrene rubber are suitable
4-8 parts of buna, 5-15 parts of plasticizer, 5-10 parts of fire retardant, 0.5-1.5 parts of accelerating agent, 1-3 parts of sulphur, 2-5 parts of zinc oxide,
1-2 parts of stearic acid, 1-3 parts of dispersant, 2-4 parts of antioxidant, 2-8 parts of carbon black；Rubber cover is mixed by weight component meter, is made
Rubber cover particle；
The sizing material is by weight component meter：14 parts of latex, 38 parts of styrene-butadiene latex, closes cloth and starches 31 parts, 101 adhesive pastes 17
Part；Stirring is sufficiently mixed, impregnation thickener is made；
Step 2: impregnation；
Step 3: rubberizing, vulcanization.
As preferable technical solution：The step two, imported into the impregnation equipped with impregnation thickener by fabric sandwich layer and fills
In putting, impregnation is carried out.
As preferable technical solution：Rubber cover particle, be put into extruder by the step three, in step 2
Fabric sandwich layer after impregnation, carries out bilateral vulcanization rubberizing so that upper rubber cover and lower rubber cover and the fabric sandwich layer after impregnation material
Stick together.
The beneficial effects of the invention are as follows：Fabric core conveyor belt and preparation method thereof, compared with traditional structure and method：Fabric
Sandwich layer good integrity, simple production process, is not easy to be layered, and is produced easy to impregnation, excellent shock resistance；Prepared using rational
Method, combines the new formula of rubber cover and sizing material so that fabric core conveyor belt has good cement properties and fatigue durability
Can, structural strength is high, wear-resisting, corrosion resistance and good, and need not use mixer, three rollers or four-roll calender, reduces
The use cost of equipment, has saved resource, improves production efficiency.
Brief description of the drawings
Fig. 1 is fabric core structure schematic diagram of the present invention；
Fig. 2 is preparation method structure diagram of the present invention；
In figure：Rubber cover, 2. times rubber covers, 3. fabric sandwich layers, 4. main warp lines, 5. wefts, 6. connection warps on 1..
Embodiment
The present invention is further described below in conjunction with the accompanying drawings；
In the accompanying drawings：Fabric core conveyor belt 106, including upper rubber cover 1 and lower rubber cover 2；The upper rubber cover 1 is with
At least one layer of fabric sandwich layer 3 is provided between rubber cover 2；After the 3 impregnation material 101 of fabric sandwich layer with upper rubber cover 1 and under
Rubber cover 2 binds；It is characterized in that：The fabric sandwich layer 3 is directly through straight latitude structure, including main warp line 4, weft 5, and connection
Connection warp 6 between main warp line 4 and weft 5；The fabric sandwich layer 3 is 1 layer either 2 layers or 3 layers；The main warp
It is vertically arranged between line 4 and weft 5；The weft 5 is symmetricly set on 4 both sides of main warp line；The main warp line 4 is low for high mould
Contracting terylene, aramid fiber industrial filament；The weft 5 is using polyamide fibre 6 or the industrial filament of polyamide fibre 66；The connection warp 6 is adopted
With polyamide fibre or polyester industrial filament yarn；So that 3 good integrity of fabric sandwich layer, simple production process, is not easy to be layered, and is given birth to easy to impregnation
Production, excellent shock resistance.
First embodiment：
The preparation method of fabric core conveyor belt 106, including following procedure of processing：
Step 1: slurrying；Prepare rubber cover and sizing material 101；
The rubber cover is by weight component meter：40 parts of Afpol, 12 parts of butadiene-styrene rubber, along fourth rubber
8 parts of glue, 15 parts of plasticizer, 10 parts of fire retardant, 1 part of accelerating agent, 1.5 parts of sulphur, 3.5 parts of zinc oxide, 1 part of stearic acid, dispersant 1
Part, 2 parts of antioxidant, 5 parts of carbon black；Rubber cover is mixed by weight component meter, rubber cover particle is made；
The sizing material 101 is by weight component meter：14 parts of latex, 38 parts of styrene-butadiene latex, closes cloth and starches 31 parts, 101 adhesive pastes
17 parts；By sizing material 101 by weight component meter, stirring is sufficiently mixed, impregnation thickener is made；
Step 2: impregnation；Fabric sandwich layer 3 is imported into the gumming device 102 equipped with impregnation thickener, carries out impregnation；
Step 3: rubberizing, vulcanization；Rubber cover particle is put into extruder 103, to the fabric after the impregnation in step 2
Sandwich layer 3, carries out bilateral vulcanization rubberizing so that upper rubber cover 1 and lower rubber cover 2 are binded with the fabric sandwich layer 3 after impregnation material 101
Together；
In actual use, fabric sandwich layer 3 is dried by drying equipment 104, travel further into gumming device 102 into
Row impregnation, the cleaner 107 for being arranged on the top of gumming device 102 carries out inhaling grey dedusting, further by extruder 103 to leaching
Fabric sandwich layer 3 after glue carries out bilateral vulcanization and sticks rubber cover 1 and lower rubber cover 2, is finally rolled by traction crimping device 105,
Enable fabric sandwich layer 3 smoothly in drying equipment 104, gumming device 102 and crowded due to being provided with traction crimping device 105
Moved between press 103, realize the shaping of fabric core conveyor belt, reach following parameter：
Parameter is：Fabric core strength：100N/mm；Impregnation thickness：0.35-0.55mm；Fabric core temperature：90℃；Rubber cover
Thickness：Lower rubber cover 2 is 2-6mm or upper rubber cover 1 is 4-10mm；The layer part of lamination fitting glues strength：8-10N/mm；
Using different materials formula, with reference to new preparation method so that fabric core conveyor belt has good cement properties
And fatigue performance, structural strength is high, wear-resisting, corrosion resistance and good, and need not use mixer, three rollers or four-roll calendaring
Machine, reduces the use cost of equipment, has saved resource, improve production efficiency.
Second embodiment：
The preparation method of fabric core conveyor belt 106, including following procedure of processing：
Step 1: slurrying；Prepare rubber cover and sizing material 101；
The rubber cover is by weight component meter：47 parts of Afpol, 10 parts of butadiene-styrene rubber, along fourth rubber
6 parts of glue, 10 parts of plasticizer, 7 parts of fire retardant, 1.5 parts of accelerating agent, 2 parts of sulphur, 4 parts of zinc oxide, 1.5 parts of stearic acid, dispersant 2
Part, 3 parts of antioxidant, 6 parts of carbon black；Rubber cover is mixed by weight component meter, rubber cover particle is made；
The sizing material 101 is by weight component meter：14 parts of latex, 38 parts of styrene-butadiene latex, closes cloth and starches 31 parts, 101 adhesive pastes
17 parts；By sizing material 101 by weight component meter, stirring is sufficiently mixed, impregnation thickener is made；
Step 2: impregnation；Fabric sandwich layer 3 is imported into the gumming device 102 equipped with impregnation thickener, carries out impregnation；
Step 3: rubberizing, vulcanization；Rubber cover particle is put into extruder 103, to the fabric after the impregnation in step 2
Sandwich layer 3, carries out bilateral vulcanization rubberizing so that upper rubber cover 1 and lower rubber cover 2 are binded with the fabric sandwich layer 3 after impregnation material 101
Together；
In actual use, fabric sandwich layer 3 is dried by drying equipment 104, travel further into gumming device 102 into
Row impregnation, the cleaner 107 for being arranged on the top of gumming device 102 carries out inhaling grey dedusting, further by extruder 103 to leaching
Fabric sandwich layer 3 after glue carries out bilateral vulcanization and sticks rubber cover 1 and lower rubber cover 2, is finally rolled by traction crimping device 105,
Enable fabric sandwich layer 3 smoothly in drying equipment 104, gumming device 102 and crowded due to being provided with traction crimping device 105
Moved between press 103, realize the shaping of fabric core conveyor belt, reach following parameter：
Parameter is：Fabric core strength：100N/mm；Impregnation thickness：0.35-0.55mm；Fabric core temperature：90℃；Rubber cover
Thickness：Lower rubber cover 2 is 2-6mm or upper rubber cover 1 is 4-10mm；The layer part of lamination fitting glues strength：8-10N/mm；
Using different materials formula, with reference to new preparation method so that fabric core conveyor belt has good cement properties
And fatigue performance, structural strength is high, wear-resisting, corrosion resistance and good, and need not use mixer, three rollers or four-roll calendaring
Machine, reduces the use cost of equipment, has saved resource, improve production efficiency.
3rd embodiment：
The preparation method of fabric core conveyor belt 106, including following procedure of processing：
Step 1: slurrying；Prepare rubber cover and sizing material 101；
The rubber cover is by weight component meter：62 parts of Afpol, 8 parts of butadiene-styrene rubber, butadiene rubber
5 parts, 8 parts of plasticizer, 5 parts of fire retardant, 0.5 part of accelerating agent, 1 part of sulphur, 2 parts of zinc oxide, 1 part of stearic acid, 1.5 parts of dispersant,
2 parts of antioxidant, 4 parts of carbon black；Rubber cover is mixed by weight component meter, rubber cover particle is made；
The sizing material 101 is by weight component meter：14 parts of latex, 38 parts of styrene-butadiene latex, closes cloth and starches 31 parts, 101 adhesive pastes
17 parts；By sizing material 101 by weight component meter, stirring is sufficiently mixed, impregnation thickener is made；
Step 2: impregnation；Fabric sandwich layer 3 is imported into the gumming device 102 equipped with impregnation thickener, carries out impregnation；
Step 3: rubberizing, vulcanization；Rubber cover particle is put into extruder 103, to the fabric after the impregnation in step 2
Sandwich layer 3, carries out bilateral vulcanization rubberizing so that upper rubber cover 1 and lower rubber cover 2 are binded with the fabric sandwich layer 3 after impregnation material 101
Together；
In actual use, fabric sandwich layer 3 is dried by drying equipment 104, travel further into gumming device 102 into
Row impregnation, the cleaner 107 for being arranged on the top of gumming device 102 carries out inhaling grey dedusting, further by extruder 103 to leaching
Fabric sandwich layer 3 after glue carries out bilateral vulcanization and sticks rubber cover 1 and lower rubber cover 2, is finally rolled by traction crimping device 105,
Enable fabric sandwich layer 3 smoothly in drying equipment 104, gumming device 102 and crowded due to being provided with traction crimping device 105
Moved between press 103, realize the shaping of fabric core conveyor belt, reach following parameter：
Parameter is：Fabric core strength：100N/mm；Impregnation thickness：0.35-0.55mm；Fabric core temperature：90℃；Rubber cover
Thickness：Lower rubber cover 2 is 2-6mm or upper rubber cover 1 is 4-10mm；The layer part of lamination fitting glues strength：8-10N/mm；
Using different materials formula, with reference to new preparation method so that fabric core conveyor belt has good cement properties
And fatigue performance, structural strength is high, wear-resisting, corrosion resistance and good, and need not use mixer, three rollers or four-roll calendaring
Machine, reduces the use cost of equipment, has saved resource, improve production efficiency.
The specification of fabric core conveyor belt 106 is during present invention specific implementation：
Above-described embodiment is only intended to clearly illustrate the description that the present invention is made, and is not the restriction to embodiment,
To those of ordinary skill in the art, other various forms of changes or change can also be made on the basis of the above description
Dynamic, there is no necessity and possibility to exhaust all the enbodiments, and the obvious change or change thus amplified out
Among moving still in protection scope of the present invention.
Claims (8)
1. fabric core conveyor belt, including upper rubber cover (1) and lower rubber cover (2)；The upper rubber cover (1) and lower rubber cover
(2) at least one layer of fabric sandwich layer (3) is provided between；Fabric sandwich layer (3) the impregnation material (101) afterwards with upper rubber cover (1)
Binded with lower rubber cover (2)；It is characterized in that：The fabric sandwich layer (3) is directly through straight latitude structure, including main warp line (4), weft
And the connection warp (6) that is connected between main warp line (4) and weft (5) (5),.
2. fabric core conveyor belt according to claim 1, it is characterized in that：The fabric sandwich layer (3) is 1 layer or 2 layers
Or 3 layers.
3. fabric core conveyor belt according to claim 1, it is characterized in that：Hang down between the main warp line (4) and weft (5)
It is straight to set.
4. fabric core conveyor belt according to claim 3, it is characterized in that：The weft (5) is symmetricly set on main warp line
(4) both sides.
5. fabric core conveyor belt according to claim 1, it is characterized in that：The main warp line (4) for HMLS Polyester,
Aramid fiber industrial filament；The weft (5) is using polyamide fibre 6 or the industrial filament of polyamide fibre 66；The connection warp (6) is using brocade
Synthetic fibre or polyester industrial filament yarn.
6. the preparation method of fabric core conveyor belt according to claim 1, it is characterized in that：Including following procedure of processing：
Step 1: slurrying；Prepare rubber cover and sizing material (101)；
The rubber cover is by weight component meter：40-65 parts of Afpol, 8-15 parts of butadiene-styrene rubber, along fourth rubber
4-8 parts of glue, 5-15 parts of plasticizer, 5-10 parts of fire retardant, 0.5-1.5 parts of accelerating agent, 1-3 parts of sulphur, 2-5 parts of zinc oxide are stearic
It is 1-2 parts sour, 1-3 parts of dispersant, 2-4 parts of antioxidant, 2-8 parts of carbon black；Rubber cover is mixed by weight component meter, covering is made
Glue particle；
The sizing material (101) is by weight component meter：14 parts of latex, 38 parts of styrene-butadiene latex, closes cloth and starches 31 parts, 101 adhesive pastes 17
Part；Stirring is sufficiently mixed, impregnation thickener is made；
Step 2: impregnation；
Step 3: rubberizing, vulcanization.
7. the preparation method of fabric core conveyor belt according to claim 6, it is characterized in that：The step two, by fabric
Sandwich layer (3) is imported into the gumming device equipped with impregnation thickener (102), carries out impregnation.
8. the preparation method of fabric core conveyor belt according to claim 6, it is characterized in that：The step three, will covering
Glue particle is put into extruder (103), to the fabric sandwich layer (3) after the impregnation in step 2, carries out bilateral vulcanization rubberizing so that
Upper rubber cover (1) and lower rubber cover (2) stick together with the fabric sandwich layer (3) after impregnation material (101).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201711178566.3A CN107934376A (en) | 2017-11-23 | 2017-11-23 | Fabric core conveyor belt and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711178566.3A CN107934376A (en) | 2017-11-23 | 2017-11-23 | Fabric core conveyor belt and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110549652A (en) * | 2018-05-30 | 2019-12-10 | 江苏海川新材料科技有限公司 | Pultrusion production is with quick steeping vat with shield |
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