CN102991403B - Compartment body plate for refrigerated truck and preparation method of compartment body plate - Google Patents
Compartment body plate for refrigerated truck and preparation method of compartment body plate Download PDFInfo
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- CN102991403B CN102991403B CN201210556226.0A CN201210556226A CN102991403B CN 102991403 B CN102991403 B CN 102991403B CN 201210556226 A CN201210556226 A CN 201210556226A CN 102991403 B CN102991403 B CN 102991403B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- -1 polypropylene Polymers 0.000 claims abstract description 50
- 239000004743 Polypropylene Substances 0.000 claims abstract description 49
- 229920001155 polypropylene Polymers 0.000 claims abstract description 43
- 239000006260 foam Substances 0.000 claims abstract description 29
- 238000005187 foaming Methods 0.000 claims abstract description 15
- 239000003365 glass fiber Substances 0.000 claims abstract description 14
- 239000004698 Polyethylene Substances 0.000 claims abstract description 11
- 229920000573 polyethylene Polymers 0.000 claims abstract description 11
- 239000004088 foaming agent Substances 0.000 claims abstract description 6
- 239000002667 nucleating agent Substances 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 39
- 239000002131 composite material Substances 0.000 claims description 16
- 238000005057 refrigeration Methods 0.000 claims description 13
- 239000003381 stabilizer Substances 0.000 claims description 11
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 10
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 10
- 150000001875 compounds Chemical class 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 238000007731 hot pressing Methods 0.000 claims description 9
- 239000011152 fibreglass Substances 0.000 claims description 7
- 239000011521 glass Substances 0.000 claims description 7
- 238000001125 extrusion Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 238000004513 sizing Methods 0.000 claims description 6
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 5
- 239000001569 carbon dioxide Substances 0.000 claims description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 4
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 4
- 239000000194 fatty acid Substances 0.000 claims description 4
- 229930195729 fatty acid Natural products 0.000 claims description 4
- 230000004927 fusion Effects 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 238000010622 cold drawing Methods 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 239000002759 woven fabric Substances 0.000 claims description 3
- NBOCQTNZUPTTEI-UHFFFAOYSA-N 4-[4-(hydrazinesulfonyl)phenoxy]benzenesulfonohydrazide Chemical compound C1=CC(S(=O)(=O)NN)=CC=C1OC1=CC=C(S(=O)(=O)NN)C=C1 NBOCQTNZUPTTEI-UHFFFAOYSA-N 0.000 claims description 2
- 239000006229 carbon black Substances 0.000 claims description 2
- USIUVYZYUHIAEV-UHFFFAOYSA-N diphenyl ether Chemical class C=1C=CC=CC=1OC1=CC=CC=C1 USIUVYZYUHIAEV-UHFFFAOYSA-N 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 235000012239 silicon dioxide Nutrition 0.000 claims description 2
- 239000000454 talc Substances 0.000 claims description 2
- 229910052623 talc Inorganic materials 0.000 claims description 2
- 239000011787 zinc oxide Substances 0.000 claims description 2
- 238000013329 compounding Methods 0.000 abstract 1
- 239000004872 foam stabilizing agent Substances 0.000 abstract 1
- 239000002994 raw material Substances 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 7
- 238000005452 bending Methods 0.000 description 7
- 230000006835 compression Effects 0.000 description 7
- 238000007906 compression Methods 0.000 description 7
- 238000009413 insulation Methods 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 229920002635 polyurethane Polymers 0.000 description 5
- 239000004814 polyurethane Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 238000007664 blowing Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000002480 mineral oil Substances 0.000 description 3
- 235000010446 mineral oil Nutrition 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 239000002985 plastic film Substances 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 2
- 210000004027 cell Anatomy 0.000 description 2
- 210000002421 cell wall Anatomy 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000012536 packaging technology Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
- 206010000269 abscess Diseases 0.000 description 1
- 239000013064 chemical raw material Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 239000011496 polyurethane foam Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 229920006337 unsaturated polyester resin Polymers 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Molding Of Porous Articles (AREA)
- Refrigerator Housings (AREA)
Abstract
The invention discloses a compartment body plate for a refrigerated truck. The compartment body plate is formed by compounding glass fibre reinforced polypropylene panels on the upper surface and the lower surface of a polypropylene foam plate, wherein the polypropylene foam plate is formed by following foaming raw materials in ratio by mass: 100 parts of modified polypropylene, 5-10 parts of modified polyethylene, 0.2-1.5 parts of a nucleating agent, 5-10 parts of a foaming agent, and 0.2-1.5 parts of a foam stabilizing agent. The invention further discloses a preparation method of the plate. The plate adopting the technical scheme is light and environment-friendly, not easy to deform, high in mechanical property, simple and convenient in splicing mode, excellent in heat-insulating performance, low in cost, and capable of meeting the needs on the compartment body plates for the conventional refrigerated trucks.
Description
Technical field
The invention belongs to van cooler manufacturing technology field and macromolecule foaming field of compound material, particularly relate to refrigeration car carriage sheet material and preparation method thereof.
Background technology
Van cooler is the key equipment of an important step in low temperature Cold Chain Logistics.It is ensure key point that is perishable, the safety of fresh-keeping foodstuff in transportation that van cooler reliable operation, performance in refrigerated transport process are stablized.Road transport van cooler is made up of car chassis, insulation envelope, refrigerating unit three part usually.Wherein heat-insulation and heat-preservation envelope is spliced by core filled composite material plate material, and its sheet material is generally composited by polyurethane heat-insulation core and glass-felt plastic, color steel, stainless steel faceplate etc.
Present stage, refrigerator carriage body manufacturing technology was mainly following several: " sandwich " plate that 1, burst is assembled is adhered, and domestic larger van cooler manufacturing enterprise all adopts this technology at present, and the van cooler heat-proof quality utilizing this technology to produce is higher.2, the injection foaming type that burst is assembled.3, overall skeleton injects foaming type.4, vacuum adsorption type is pasted.Wherein, totally-enclosed polyurethane plate adhesive glass steel structure all has use in the second generation and third generation van cooler manufacturing enterprise.This product weight is light, thermal leakage ratio (coefficient of thermal conductivity) is low, high insulating effect, and use unsaturated polyester resin to make adhesive agent, another cushioned layer, warm material then uses hard polyurethane foams, and the coefficient of thermal conductivity of envelope is low, intensity is high, plate bonding high strength, high leakproofness adhesive, form an entirety.But after polyurethane cutting, loss ratio is comparatively large, and therefore material cost is higher.Especially, when current chemical raw material appreciates serious, the productive costs in compartment is more and more higher.And existingly reclaim difficulty using glass-felt plastic, color steel, stainless steel faceplate as the compartment of panel after scrapping, do not have an environment friendly, and be not easy after surface fracture to repair, affect the later stage use of van cooler.Its heavier-weight of the van cooler assembled in this form, and packaging technology is complicated, connecting between sheet material will by the form of rivet, and leak tightness is not desirable especially, finally cause van cooler packaging technology complicated, and the shortcoming that the input cost of the working expenses of later stage use is higher.
Summary of the invention
In order to solve above-mentioned technical matters, an object of the present invention is to provide a kind of refrigeration car carriage sheet material, light-weight environment-friendly, not yielding, mechanical property is high, connecting method is easy, excellent thermal insulation performance, cost are low, can meet current body plate of refrigerator van material demand.
Two of object of the present invention is to provide above-mentioned refrigeration car carriage preparation of plates method.
To achieve the above object, present invention employs following technical scheme:
A kind of refrigeration car carriage sheet material, be made up of polypropylene foam sheet material upper and lower surface composite glass fiber RPP panel, wherein, described polypropylene foam sheet material is foamed by the raw MAT'L of following mass ratio and is formed: modified polypropene 100 parts, modified poly ethylene 5 ~ 10 parts, nucleating agent 0.2 ~ 1.5 part, foaming agent 5 ~ 10 parts, foam stabilizer 0.2 ~ 1.5 part.
Described modified polypropene refers to that fusion index is the high fondant-strength PP particle of 2.5-3.5g/10min, and Rupture Stress is 1.53-4.30N.Described modified poly ethylene is high pressure polyethylene, and its fusion index is 2-10 g/10min.Described nucleating agent is one or more compounds of calcium carbonate, french talc, silicon dioxide, zinc oxide, carbon black, plays the effect improving cell density.Described foaming agent is one or several compounds of carbon dioxide, Celogen Az, 4,4-disulfonyl hydrazide diphenyl ethers, plays the effect improving cell density and improve abscess-size size.Described foam stabilizer is one or more compounds in fatty acid glyceride class foaming stabilizer, methyl glycol fatty acid ester class foaming stabilizer and isooctyl alcohol fatty ester class foaming stabilizer, be mainly used in the intensity improving cell wall, prevent breaking of cell wall, play the effect of stable bubble hole.
As preferably, described fiber glass reinforced polypropylene panel is formed by the blended woven fabric hot pressing of glass and polyacrylic fibres, and wherein, polypropylene content is 40%, and glass fiber content is 60%.
As preferably, described fiber glass reinforced polypropylene plate thickness is 1.5 ~ 2.5mm, and the thickness of polypropylene foam sheet material is 50 ~ 70mm.
A kind of refrigeration car carriage preparation of plates method, comprises the steps:
1) raw MAT'L premix: raw MAT'L is added in mixing and blending machine and stir 30 ~ 40min, then carry out plasticating 5 ~ 6min;
2) foam shaping by extrusion: the raw MAT'L through step 1) premix is delivered to double screw extrusion machine and extrudes, then sizing obtains polypropylene foam sheet material in a mold, and mold temperature is 60 ~ 75 DEG C;
3) composite glass fiber RPP panel: glass and polypropylene blended cloth are first passed through a warm-up mill preheating, then with step 2) send into the cold and hot pressing plate sizing compound of hot press together with the polypropylene foam sheet material that obtains, finally draw to cutter and carry out cutting, obtain described refrigeration car carriage sheet material, wherein, the temperature of described warm-up mill is 150 ~ 170 DEG C, in described cold and hot pressing plate: hot plate length is 1 ~ 1.5m, and temperature is 180 ~ 190 DEG C; Cold drawing length is 4 ~ 4.5m, and temperature is 60 ~ 70 DEG C.
The present invention is owing to have employed above technical scheme, on polypropylene foam sheet material after composite glass fiber RPP panel, the bending strength of whole product, strength under shock, bending modulus all increase, and have sound-deadening and noise-reducing, easy to assembly, odorlessness, easily recovery, degradable, the advantage such as environmentally friendly.The present invention refrigerates mechanical property and the excellent thermal insulation performance of car carriage sheet material, can meet the demand of current refrigerator carriage body technique development.The production process that the present invention refrigerates car carriage sheet material continuously and stable, the safe non-environmental-pollution of production process, is applicable to industrial-scale production.
Accompanying drawing explanation
Fig. 1 is the structural representation that the present invention refrigerates car carriage sheet material.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is made a detailed explanation.
One refrigeration car carriage sheet material as shown in Figure 1, be made up of polypropylene foam sheet material 1 upper and lower surface composite glass fiber RPP panel 2, wherein, described polypropylene foam sheet material is foamed by the raw MAT'L of following mass ratio and is formed: modified polypropene 100 parts, modified poly ethylene 5 ~ 10 parts, nucleating agent 0.2 ~ 1.5 part, foaming agent 5 ~ 10 parts, foam stabilizer 0.2 ~ 1.5 part.
Described fiber glass reinforced polypropylene panel is formed by the blended woven fabric hot pressing of glass and polyacrylic fibres, and wherein, polypropylene content is 40%, and glass fiber content is 60%.Described fiber glass reinforced polypropylene plate thickness is 1.5 ~ 2.5mm, and the thickness of polypropylene foam sheet material is 50 ~ 70mm.
Above-mentioned refrigeration car carriage preparation of plates method, comprises the steps:
1) raw MAT'L premix: raw MAT'L is added in mixing and blending machine and stir 30 ~ 40min, then carry out plasticating 5 ~ 6min;
2) foam shaping by extrusion: the raw MAT'L through step 1) premix is delivered to double screw extrusion machine and extrudes, then sizing obtains polypropylene foam sheet material in a mold, and mold temperature is 60 ~ 75 DEG C;
3) composite glass fiber RPP panel: glass and polypropylene blended cloth are first passed through a warm-up mill preheating, then with step 2) send into the cold and hot pressing plate sizing compound of hot press together with the polypropylene foam sheet material that obtains, finally draw to cutter and carry out cutting, obtain described refrigeration car carriage sheet material, wherein, the temperature of described warm-up mill is 150 ~ 170 DEG C, in described cold and hot pressing plate: hot plate length is 1 ~ 1.5m, and temperature is 180 ~ 190 DEG C; Cold drawing length is 4 ~ 4.5m, and temperature is 60 ~ 70 DEG C.
Following embodiment product adopts said method manufacture, products obtained therefrom thickness be 60mm(wherein fiberglass reinforced PP plate thickness be 2.5mm), following comparative example product is commercial same thickness sheet material:
Embodiment 1:
By modified polypropene 100 parts, modified poly ethylene 10 parts, 0.2 part, calcium carbonate, carbon dioxide 10 parts, 0.2 part, mineral oil, plasticate 6min at 170 DEG C, then drop in extruder, foaming and setting in hot-die molding machine, blowing temperature is 170 DEG C, time of heat is 15min, obtain foamed plastic sheet material, then enter double-steel belt pressing machine composite glass fiber and strengthen PP panel, obtain polypropylene foam Composite board products 1, compression strength is 1.95MPa, superficial hardness 75HD, panel peel strength 201.6 [(Nmm)/mm], bending strength 10MPa.Coefficient of thermal conductivity is 0.035 W/(mk)
-1.
Embodiment 2:
By modified polypropene 100 parts, modified poly ethylene 5 parts, 0.2 part, calcium carbonate, carbon dioxide 10 parts, 0.2 part, mineral oil, plasticate 6min at 170 DEG C, then drop in extruder, foaming and setting in hot-die molding machine, blowing temperature is 170 DEG C, time of heat is 15min, obtain foamed plastic sheet material, then enter double-steel belt pressing machine composite glass fiber and strengthen PP panel, obtain polypropylene foam Composite board products 2, compression strength is 1.75MPa, superficial hardness 73HD, panel peel strength 203.4 [(Nmm)/mm], bending strength 9.3MPa.Coefficient of thermal conductivity is 0.036 W/(mk)
-1.
Embodiment 3:
By modified polypropene 100 parts, modified poly ethylene 10 parts, 0.2 part, calcium carbonate, carbon dioxide 5 parts, 0.2 part, mineral oil, plasticate 6min at 170 DEG C, then drop in extruder, foaming and setting in hot-die molding machine, blowing temperature is 170 DEG C, time of heat is 15min, obtain foamed plastic sheet material, then enter double-steel belt pressing machine composite glass fiber and strengthen PP panel, obtain polypropylene foam Composite board products 3, compression strength is 1.86MPa, superficial hardness 77HD, panel peel strength 202.6 [(Nmm)/mm], bending strength 9.6MPa.Coefficient of thermal conductivity is 0.033 W/(mk)
-1.
Comparative example 1:
The polyurethane heat-insulation core manufactured by pouring-in foaming method is sandwich of layers, glass-felt plastic is the composite board of panel, its compression strength is compression strength is 1.16MPa, superficial hardness 72HD, panel peel strength 130.6 [(Nmm)/mm], bending strength 7.6MPa, coefficient of thermal conductivity is 0.042 W/(mk)
-1.
comparative example 2
The polyurethane heat-insulation core manufactured by pouring-in foaming method is sandwich of layers, color steel is the composite board of panel, its compression strength is compression strength is 1.06MPa, superficial hardness 71HD, panel peel strength 110.6 [(Nmm)/mm], bending strength 6.1MPa, coefficient of thermal conductivity is 0.045 W/(mk)
-1.
It is emphasized that: be only preferred embodiment of the present invention above, not any pro forma restriction is done to the present invention, every above embodiment is done according to technical spirit of the present invention any simple modification, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (2)
1. a refrigeration car carriage sheet material, it is characterized in that, be made up of polypropylene foam sheet material (1) upper and lower surface composite glass fiber RPP panel (2), wherein, described polypropylene foam sheet material is foamed by the raw MAT'L of following mass ratio and is formed: modified polypropene 100 parts, modified poly ethylene 5 ~ 10 parts, nucleating agent 0.2 ~ 1.5 part, foaming agent 5 ~ 10 parts, foam stabilizer 0.2 ~ 1.5 part; Described modified polypropene refers to that fusion index is the high fondant-strength PP particle of 2.5-3.5g/10min, and Rupture Stress is 1.53-4.30N; Described modified poly ethylene is high pressure polyethylene, and its fusion index is 2-10 g/10min; Described nucleating agent is one or more compounds of calcium carbonate, french talc, silicon dioxide, zinc oxide, carbon black; Described foaming agent is one or several compounds of carbon dioxide, Celogen Az, 4,4-disulfonyl hydrazide diphenyl ethers; Described foam stabilizer is one or more compounds in fatty acid glyceride class foaming stabilizer, methyl glycol fatty acid ester class foaming stabilizer and isooctyl alcohol fatty ester class foaming stabilizer; Described fiber glass reinforced polypropylene panel is formed by the blended woven fabric hot pressing of glass and polyacrylic fibres, and wherein, polypropylene content is 40%, and glass fiber content is 60%; Described fiber glass reinforced polypropylene plate thickness is 1.5 ~ 2.5mm, and the thickness of polypropylene foam sheet material is 50 ~ 70mm.
2. one refrigeration car carriage preparation of plates method according to claim 1, is characterized in that, comprise the steps:
1) raw MAT'L premix: raw MAT'L is added in mixing and blending machine and stir 30 ~ 40min, then carry out plasticating 5 ~ 6min;
2) foam shaping by extrusion: by through step 1) raw MAT'L of premix delivers to double screw extrusion machine and extrudes, and then sizing obtains polypropylene foam sheet material in a mold, and mold temperature is 60 ~ 75 DEG C;
3) composite glass fiber RPP panel: glass and polypropylene blended cloth are first passed through a warm-up mill preheating, then with step 2) send into the cold and hot pressing plate sizing compound of hot press together with the polypropylene foam sheet material that obtains, finally draw to cutter and carry out cutting, obtain described refrigeration car carriage sheet material, wherein, the temperature of described warm-up mill is 150 ~ 170 DEG C, in described cold and hot pressing plate: hot plate length is 1 ~ 1.5m, and temperature is 180 ~ 190 DEG C; Cold drawing length is 4 ~ 4.5m, and temperature is 60 ~ 70 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210556226.0A CN102991403B (en) | 2012-12-19 | 2012-12-19 | Compartment body plate for refrigerated truck and preparation method of compartment body plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210556226.0A CN102991403B (en) | 2012-12-19 | 2012-12-19 | Compartment body plate for refrigerated truck and preparation method of compartment body plate |
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| CN102991403A CN102991403A (en) | 2013-03-27 |
| CN102991403B true CN102991403B (en) | 2015-07-08 |
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| CN107722417B (en) * | 2017-09-20 | 2020-12-25 | 广德祥源新材科技有限公司 | Composite high-thermal-conductivity buffer irradiation crosslinked polyethylene foam and preparation method thereof |
| CN115107301A (en) * | 2022-06-15 | 2022-09-27 | 江苏莘翔机电股份有限公司 | Production process of low-cost glass-carbon mixed heavy truck sleeper |
| GB202215919D0 (en) * | 2022-10-27 | 2022-12-14 | Warburton Christopher John | Improvements to apparatus for maintaining a cooled environment in a vehicle and a vehicle including said cooled environment |
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| BRPI0417923A (en) * | 2003-12-22 | 2007-04-17 | Nova Chem Inc | process for forming interpolymer resin particles, interpolymer resin particles, extruded article, injection molded article, thermo-shaped article, multilayer structure, polymer composition, and process for producing articles with improved writing properties. |
| CN101353460B (en) * | 2008-09-11 | 2011-11-16 | 丹阳市华东工程塑料有限公司 | Environment-friendly type micro-foaming polypropylene sheet and preparation thereof |
| CN102115561B (en) * | 2009-12-30 | 2013-02-20 | 李晓丽 | Physical foaming polypropylene sheet material |
| CN102218828A (en) * | 2011-05-27 | 2011-10-19 | 常州市宏发纵横新材料科技股份有限公司 | Method for preparing continuous fiber multiaxial fabric reinforced thermoplastic composite material |
| CN202115020U (en) * | 2011-06-03 | 2012-01-18 | 常州市宏发纵横新材料科技股份有限公司 | Multi-axial reinforced thermoplastic composite plate with continuous fibers |
| CN202498800U (en) * | 2012-03-22 | 2012-10-24 | 台州市家得宝日用品有限公司 | Continuous fiber reinforced polypropylene foamed board |
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Effective date of registration: 20190419 Address after: 225008 No. 7 Xinyi Road, Yangzhou City, Jiangsu Province Patentee after: Maisitong Composite Materials Co., Ltd., Yangzhou City Address before: 311121 Building No. 2, Huayi Road, Yuhang Street, Yuhang District, Hangzhou City, Zhejiang Province Patentee before: Hangzhou Holycore Composite Material Co., Ltd. |