CN102689458B - Cellular board and manufacturing method thereof - Google Patents
Cellular board and manufacturing method thereof Download PDFInfo
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- CN102689458B CN102689458B CN201210195158.XA CN201210195158A CN102689458B CN 102689458 B CN102689458 B CN 102689458B CN 201210195158 A CN201210195158 A CN 201210195158A CN 102689458 B CN102689458 B CN 102689458B
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Abstract
The invention discloses a manufacturing method of a cellular board which comprises the following steps of: producing a double-layer composite pipe, wherein the inner layer of the double-layer composite pipe is a high-melting-point material layer, the outer layer of the double-layer composite pipe is a low-melting-point material layer, and the melting point of the low-melting-point material layer is lower than that of the high-melting-point material layer; bundling the multiple double-layer composite pipes in order, heating so that the outer layer of the double-layer composite pipe is melted and the inner layer is not melted and cooling to enable the adjacent attached outer layers of the double-layer composite pipe are bonded together to form a honeycomb; cutting the honeycomb along the cross section of the double-layer composite pipe so as to obtain a platy honeycomb base material; and hot pressing the top surface and the bottom surface of the multiple honeycomb base materials in the same plane so that the end surface of the adjacent attached inner layers of the double-layer composite pipe is fused to form a fillet to obtain the cellular board. The invention also discloses a cellular board manufactured by using the method. According to the technical scheme, the cellular board with stability, evenness, reliable quality, high intensity and large area can be obtained.
Description
Technical field
The invention belongs to cellular material field, particularly relate to a kind of cellular board and preparation method thereof.
Background technology
In the modern times that resource and the energy are more and more nervous, cellular material is a kind of advantageous material, because it has the advantage of high-strength light, can save a large amount of raw material.The comb core material of current Application comparison maturation is aluminium honeycomb and paper honeycomb, but the higher price of aluminium honeycomb intensity and weight also higher, be mainly used in aviation field; Paper honeycomb because of its mainly adopt be hot setting adhesive carry out infiltration bonding, the thickness of honeycomb core can not do too thick, intensity is also lower, is mainly used in packaging field.Use the honeycomb that thermoplastic is made, physical property has good lifting, impact resistance improves greatly, and thermoplastic itself has recyclable, waterproof, the advantage such as corrosion-resistant, the fields such as building materials, railway carriage or compartment car, automobile, decoration, kitchen tools can be widely used in, replacing all kinds of sheet material (as density board, plastic plate, cement plate, stone plate) etc., is the development priority of structural material in recent years.Cellular thermoplastic is a kind of high-strength light, durable corrosion-resistant, callable environment-friendly materials.
The manufacture method of cellular thermoplastic mainly contains plastic uptake type honeycomb and pipe splice type honeycomb etc. at present.
Technology controlling and process is compact comparatively speaking to inhale plastic honeycombs, and production cost is lower, but its intensity is lower relative to pipe splice type honeycomb, and is subject to the impact of plastic uptake sizing, and the height of its honeycomb core can not be too high, generally at about 8mm.WO2008141688A2 discloses a kind of manufacture method of plastic uptake cellular board.It is that this method automaticity is higher, but as above said, its specific strength is relatively low, and the height of honeycomb core can not adjust arbitrarily by operation compositions such as plastic uptake, folding, hot pressing.
Tubular type honeycomb core be by extruder squeeze by, stretching forms pipe, and to form through carrying out the operations such as fixed length cutting, boundling, bonding, cutting to pipe.Because its thermoplastic macromolecule material is subject to stretching, orientations in extrusion direction, so longitudinal strength is very strong, thus there is better resistance to compression erosion-resisting characteristics.But the technique relative complex of tubular type honeycomb, needs a large amount of long tube boundlings, and apply adhesive formation.CN16344699A discloses a kind of method of pipe being led to arrangement, dipping gluing, and this method is too large to adhesive liquid quantity consumption, and coating technique is relative complex effort also.CN1634701A also refer to a kind of by the method to the coated adhesive of pipe, and its general principle is the same, is also a large amount of adhesive stripe-coating.These methods are not very economical material benefits, improve the cost of manufacture of honeycomb, are unfavorable for the popularization of cellular material.US Patent No. 5032208 discloses a kind of forming method of tubular type honeycomb, the feature of this method is after pipe boundling, by the mode that a kind of hot line cuts, the end sections of pipe is bonded together, thus pipe is sticked together and then forms the cellular material with certain area, but the circular tube end face glue knurl volume formed by the mode that heated filament cuts is very little, adhesive strength is less, and the way be fixed together by pipe by boundling frame neither be firm especially, because pipe is hollow and easily roll, pipe is unavoidable shake or slip in the process of cutting vibrating, be difficult to be formed very uniform and stable honeycomb bonding end face glue knurl, thus the adhesive strength in actual production between pipe is little, be difficult to the cellular material making larger area.US Patent No. 5683782 discloses a kind of production method of tubular type honeycomb, evenly to be coated with at the ectonexine of pipe by multi-layer co-extruded mode and to be covered with thermoplasticity response type adhesive, by boundling frame, pipe boundling is formed honeycomb ceramics again, then by the mode of heating, pipe is all bonded together, so really, honeycomb ceramics can be made to form good intensity, but in actual production, owing to employing reactive resin, all there is a lot of difficult points in the control of the temperature and time of reaction, thus the quality of production is difficult to control, adhesive strength and the production Area comparison of cellular material are limited.Publication number is that the patent document of CN102328464A also discloses the employing two-layer compound pipe manufacturer cellular material similar with said method, there is adhesive strength equally and the Similar Problems such as production size is limited.
During for production large-sized thermoplasticity tubular type honeycomb, prior art is all difficult to accomplish, particularly at the sheet material of fabric width more than 2 meters, and the sheet material of length more than 3 meters.When using the honeycomb board of ultra-wide overlength, current solution is realized by aluminium alloy extrusions or the bridge joint such as glass fiber reinforced plastic shapes or plastic material two pieces or the little cellular board of polylith.The method complex process, should use the higher section bar of price, increase working procedure again, also will prevent from leaking, and in use, bridge joint place is again often stress raiser, and the destruction of material often from here on.If there is a kind of method can realize the manufacture of large, honeycomb plate quickly and efficiently, then the problems referred to above are readily solved.
Summary of the invention
In order to solve above-mentioned technical problem, an object of the present invention is to provide a kind of preparation method of cellular board, can be stablized, evenly, reliable in quality, high strength, large-area honeycomb board.
Two of object of the present invention is to provide cellular board prepared by said method.
To achieve the above object, present invention employs following technical scheme:
A preparation method for cellular board, comprises the steps:
1) manufacture double-layer composite pipe, the internal layer of double-layer composite pipe is materials with high melting point layer, and the skin of double-layer composite pipe is low melting material layer, and the fusing point of low melting material layer is lower than the fusing point of materials with high melting point layer;
2) by many double-layer composite pipe ordered arrangement boundlings, make the skin fusing of double-layer composite pipe by heating and internal layer is non-fusible, after cooling, the skin of the adjacent double-layer composite pipe be close to is bonded thus forms honeycomb ceramics;
3) along double-layer composite pipe cross-sectional cut honeycomb ceramics thus obtain the monolith substrate of tabular;
4) some monolith substrate of split in same plane make the end face fusion of the adjacent two-layer compound inner tube layer be close to form glue knurl by carrying out hot pressing to end face and bottom surface, thus obtain cellular board.
The technical program, first double-layer coextrusion multiple tube is carried out, then through boundling, hot blast bonds, after cooling cutting, obtain the monolith substrate of same size and specification, then the limit alignment of two pieces or polylith cellular board is spliced to together, then fall by hot melt the top layer plastics that monolith substrate top layer is about 1-2 millimeter, and apply surface pressure the top layer of honeycomb is bonded together, namely hexagonal glue knurl is defined after cooling, the intensity of this glue knurl is very high, much larger than honeycomb interior tube and tube between cohesive force, thus a bulk of cellular board is defined, in this way, continuity plastic honeycomb platelet can be spliced into the large plate of endless, and adhesive strength is high.
As preferably, the materials with high melting point layer of described double-layer composite pipe is the thermoplastics such as PP, PE, PET, PVC, PA or PPS, and fusing point is 180 ~ 220 DEG C; The low melting material layer of described double-layer composite pipe is EVA type PUR or PE type PUR, and fusing point is 120 ~ 160 DEG C.
As preferably, the circular in cross-section of described double-layer composite pipe, hexagon or other regular polygons.
As preferably, while the cellular board of shaping bulk, the fabric plane materiels such as non-woven fabrics, glass-fiber-fabric, blending glass-fiber-fabric can also be sticked at the upper and lower surface of honeycomb, play humidification, namely while hot pressing is carried out to monolith substrate end face and bottom surface, paste Compound Fabric matter plane materiel.Here hot-press equipment can be pulley type press, also can be steel band type press, can also be that PTFE is with press.In order to ensure hot pressing effect, before hot pressing, first multiple monolith substrate of split can be carried out surrounding frame by framework solid, also can use mechanical external force by monolith substrate in a forward direction parallel press close to and strength jam-packed a little.
Further preferably, in described step 4), by upper and lower warm-up mill, the hot pressing of upper and lower two layers of cloth matter plane materiel is compounded in end face and the bottom surface of monolith substrate.
As preferably, described step 2) in, by boundling framework, arrangement boundling is carried out to many double-layer composite pipes, send Hot-blast Heating to make its outer fusing by hot-air oven along the axis direction of double-layer composite pipe.Make that hot blast enters from one end, another brings out, honeycomb ceramics Quick uniform is heated.
In described step 3), can machine cuts be adopted, but as preferably, by electric heating wire, honeycomb ceramics be cut, with there being a ganoid sheet metal after electric heating wire.In cutting process, close honeycomb material melts by electric heating wire, and the sheet metal of follow-up then carries out extruding cooling to the material melted at once, plays the effect of separation.
A kind of cellular board, comprise and form cellular core layer and the facestock layer being compounded in core layer upper and lower surface by many double-layer composite pipes, the skin of the adjacent double-layer composite pipe be close to bonds together, and the end face fusion of the adjacent two-layer compound inner tube layer be close to forms glue knurl.
As preferably, described glue knurl thickness is 1 to 10mm.
The present invention is owing to have employed above technical scheme, honeycomb ceramics is formed by double-layer composite pipe heat bonding, by forming monolith substrate to honeycomb ceramics cutting, carrying out hot pressing to monolith substrate makes its top layer melt formation glue knurl, this glue knurl volume is large and bonding strength is very high, far above the bonding strength of the little glue knurl in surface that the adhesive strength between tubing skin or heated filament cutting are formed.For the honeycomb board that area requirements is less, hot pressing acquisition can be carried out to single monolith substrate, for the honeycomb board that area requirements is larger, carry out hot pressing acquisition after can being adjacent to by multiple monolith substrate split, unlimited large-area sheet material can be obtained in theory.The present invention has that timber intensity is high, area is large, uniformity is good and technique advantages of simple, the advantage such as steady quality is reliable, easily manufactured, versatility is good, production cost is low.Cellular board of the present invention can realize its expansion in function and application field by other sheet materials such as compound nonwoven cloth, glass fabric, metallic plate, wood flour board, PLASTIC LAMINATED, marble slab again.
Accompanying drawing explanation
Fig. 1 is the structural representation of double-layer composite pipe;
Fig. 2 is the structural representation of gathering step of the present invention;
Fig. 3 is the structural representation of cutting step of the present invention;
Fig. 4 is that the present invention forms the schematic diagram of sheet material by monolith substrate;
Fig. 5 is the structural representation of heat-press step of the present invention;
Fig. 6 is the A-A sectional view of Fig. 4.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is made a detailed explanation.
Embodiment 1:
A kind of cellular board as shown in Fig. 4, Fig. 6, comprise and form cellular core layer and the facestock layer 9 being compounded in core upper and lower surface by many double-layer composite pipes 1, the skin 12 of the adjacent double-layer composite pipe 1 be close to bonds together, and the end face fusion of adjacent double-layer composite pipe 1 internal layer 11 be close to forms glue knurl 71.Described glue knurl 71 thickness is 2 to 10mm.
The preparation method of above-mentioned cellular board, comprises the steps:
1) manufacture double-layer composite pipe 1, as shown in Figure 1, the internal layer of double-layer composite pipe 1 is materials with high melting point layer 11, and the skin of double-layer composite pipe 1 is low melting material layer 12, and the fusing point of low melting material layer 12 is lower than the fusing point of materials with high melting point layer 11;
2) by many double-layer composite pipes 1 ordered arrangement boundling, make the skin fusing of double-layer composite pipe 1 by heating and internal layer is non-fusible, after cooling, the skin of the adjacent double-layer composite pipe 1 be close to is bonded thus forms honeycomb ceramics 3; Wherein, as shown in Figure 2, by boundling framework 2, arrangement boundling is carried out to many double-layer composite pipes 1, send Hot-blast Heating to make its outer fusing by hot-air oven along the axis direction of double-layer composite pipe 1.
3) the cross section heated filament along double-layer composite pipe 1 cuts honeycomb ceramics 3 thus obtains the monolith substrate 6 of tabular; Wherein, as shown in Figure 3, cut by electric heating wire 4 pairs of honeycomb ceramics 3, at electric heating wire 4 below with there being a ganoid sheet metal 5, in cutting process, close honeycomb material melts by electric heating wire, and the sheet metal of follow-up then carries out extruding cooling to the material melted at once, plays the effect of separation.
4) as shown in Fig. 4, Fig. 6, some monolith substrate 6 of split in same plane make the end face fusion of adjacent double-layer composite pipe 1 internal layer be close to form glue knurl 71 by carrying out hot pressing to end face and bottom surface,
Thus obtain cellular board 7; Wherein, as shown in Figure 5, while carrying out hot pressing by upper and lower warm-up mill 8 pairs of monolith substrate 6 end faces and bottom surface, the hot pressing simultaneously of upper and lower two layers of cloth matter plane materiel 9 can also be compounded in end face and the bottom surface of monolith substrate 6.
Here is a wide 2000mm, and long 16 meters, thickness is the concrete preparation process of the cellular board of 25mm:
A) first use a main secondary two extruders double-layer coextrusion to go out plastic round tube, pipe diameter is 8mm, and round tube inner wall is polypropylene material, wall thickness 0.2mm, and circular tube external wall is EVA hot-melt adhesive, wall thickness 0.02mm.Main extruder technological temperature is 200 degrees Celsius, and secondary extruder extrusion temperature is 120 degrees Celsius, and pipe extruded velocity is 150-250 m/min.The tubing extruded is cut into the length of fixed length 500mm.
B) by ready isometric pipe, join boundling framework in batches, make the arrangement of pipe as far as possible parallel, smooth, add attention and reduce voidage as far as possible, prevent the situation of fistulae from producing.Boundling framework is cuboid, and having two blocks of independently cover plate and two blocks of side plates, the length of boundling framework is one times of width, and the honeycomb for wider width is then middle is provided with pre-baffle plate, and a cover plate is adjustable depth, whole boundling frame can erect.By the dolly of pipe good for boundling, be sent to together in hot-air oven, hot-air mouth is to pipe mouth, and make that hot blast enters from one end, another brings out, honeycomb ceramics Quick uniform is heated, and hot blast temperature 110 degrees Celsius, realizes the bonding between pipe and pipe.
C) honeycomb ceramics good for heat is taken out, be cooled to room temperature.Overall, honeycomb ceramics is made up of the thin-walled hollow plastic round tube of a large amount of, equal length and diameter.These plastic round tube all arrange according to same axis being parallel, all tangent between tube and tube, and all will align in two ends.From the side, the surrounding of every root pipe all surround by other six roots of sensation pipes.
D) honeycomb ceramics is sent into cutting machine, cutting uses band saw cutting, also can use heated filament Linear cut, and heating temperatures to 260 is spent, needing with there being a smooth sheet metal below of this cutting silk thread.Cut direction is the circle central axis perpendicular to pipe, and in the process of silk thread cutting, silk thread is by the material melts near honeycomb, and the sheet metal of follow-up then carries out extruding cooling to the PP melted at once, and play the effect of separation, the thickness of cutting is 25mm;
E) monolith substrate of well cutting is delivered to conveying device successively, use mechanical external force by monolith substrate in a forward direction parallel press close to and strength jam-packed a little;
F) monolith substrate will be adjacent to, at the uniform velocity send into steel belt pressing machine, transporting velocity 2-8 rice, meanwhile, preheated blending glass-fiber-fabric is sent into steel belt pressing machine hot pressing simultaneously, preheat temperature 160 degrees Celsius, monolith substrate top layer rapid melting during hot pressing, together with the clinkering of glass blended cloth, meanwhile, steel belt pressing machine passes through oil cylinder press top layer until cooling; Repeat said process, quantity-produced wide cut cellular board can be obtained.
G) wide cut cellular board is cut on demand the cellular board of 16 meters long.
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 (4)
1. a preparation method for cellular board, is characterized in that, comprises the steps:
1) double-layer composite pipe (1) is manufactured, the internal layer of double-layer composite pipe (1) is materials with high melting point layer (11), the skin of double-layer composite pipe (1) is low melting material layer (12), and the fusing point of low melting material layer (12) is lower than the fusing point of materials with high melting point layer (11); The materials with high melting point layer (11) of described double-layer composite pipe (1) is PP, PE, PET, PVC, PA or PPS, and the low melting material layer (12) of described double-layer composite pipe (1) is EVA type PUR or PE type PUR;
2) by many double-layer composite pipes (1) ordered arrangement boundling, the skin fusing of double-layer composite pipe (1) is made and internal layer is non-fusible by heating, after cooling, the skin of the adjacent double-layer composite pipe (1) be close to is bonded thus forms honeycomb ceramics (3), wherein, by boundling framework (2), arrangement boundling is carried out to many double-layer composite pipes (1), send Hot-blast Heating to make its outer fusing by hot-air oven along the axis direction of double-layer composite pipe (1);
3) along double-layer composite pipe (1) cross-sectional cut honeycomb ceramics (3) thus obtain the monolith substrate (6) of tabular;
4) some monolith substrate (6) of split in same plane make the end face fusion of adjacent double-layer composite pipe (1) internal layer be close to form glue knurl (71) by carrying out hot pressing to end face and bottom surface, the top layer plastics that described glue knurl (71) falls monolith substrate top layer 1-2 millimeter by hot melt are formed, thus obtain cellular board (7); Wherein, Compound Fabric matter plane materiel (9) while hot pressing is carried out to monolith substrate (6) end face and bottom surface, by upper and lower warm-up mill (8), the hot pressing of upper and lower two layers of cloth matter plane materiel (9) is compounded in end face and the bottom surface of monolith substrate (6), described glue knurl (71) is together with cloth matter plane materiel (9) clinkering; Wherein, described cloth matter plane materiel (9) is non-woven fabrics or glass-fiber-fabric.
2. the preparation method of a kind of cellular board according to claim 1, is characterized in that, the circular in cross-section of described double-layer composite pipe (1) or hexagon.
3. the preparation method of a kind of cellular board according to claim 1, it is characterized in that, described step 3) in, by electric heating wire (4), honeycomb ceramics (3) is cut, at electric heating wire (4) below with there being a ganoid sheet metal (5).
4. the cellular board that the preparation method according to claim 1 or 2 or 3 obtains, comprise and form cellular core layer and the facestock layer being compounded in core layer upper and lower surface by many double-layer composite pipes (1), it is characterized in that, the skin of the adjacent double-layer composite pipe (1) be close to bonds together, the end face fusion of adjacent double-layer composite pipe (1) internal layer be close to forms glue knurl (71), and this glue knurl (71) is together with facestock layer clinkering; Wherein, the skin of described double-layer composite pipe (1) is low melting material layer (12), and the fusing point of low melting material layer (12) is lower than the fusing point of materials with high melting point layer (11); The materials with high melting point layer (11) of described double-layer composite pipe (1) is PP, PE, PET, PVC, PA or PPS, and the low melting material layer (12) of described double-layer composite pipe (1) is EVA type PUR or PE type PUR.
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| CN201210195158.XA CN102689458B (en) | 2012-06-11 | 2012-06-11 | Cellular board and manufacturing method thereof |
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| CN102689458B true CN102689458B (en) | 2015-05-20 |
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| CN103448252B (en) * | 2013-08-05 | 2016-02-17 | 郑州精益达汽车零部件有限公司 | A kind of honeycomb panel forming device |
| CN103770346B (en) * | 2014-01-07 | 2016-05-04 | 杭州华聚复合材料有限公司 | A kind of restorative procedure of cellular thermoplastic plate |
| CN103950263B (en) * | 2014-04-18 | 2016-01-20 | 杭州华聚复合材料有限公司 | Honeycomb board and preparation, two Steel-belt Continuous Press and cooling and shaping mechanism thereof |
| CN103950262B (en) * | 2014-04-18 | 2016-08-24 | 杭州华聚复合材料有限公司 | Cellular thermoplastic sheet material and production method thereof and double Steel-belt Continuous Press |
| CN103950264B (en) * | 2014-04-21 | 2015-10-21 | 杭州华聚复合材料有限公司 | A kind of cellular thermoplastic sheet material and production method thereof and two Steel-belt Continuous Press |
| CN104097356B (en) * | 2014-07-11 | 2016-08-24 | 杭州华聚复合材料有限公司 | Cellular thermoplastic sheet material and preparation method thereof |
| CN104129107B (en) * | 2014-07-25 | 2017-01-11 | 杭州华聚复合材料有限公司 | Thermoplastic cellular sheet material and preparation method thereof |
| CN104690940B (en) * | 2015-03-02 | 2017-03-01 | 杭州华聚复合材料有限公司 | Double-layer composite pipe and its production line, preparation method and pipe splice type cellular board and preparation method thereof |
| CN104742419A (en) * | 2015-04-07 | 2015-07-01 | 广州韬普复合材料有限公司 | Preparation method of multifunctional glass fiber PP thermoplastic round pipe honeycomb composite board |
| CN107097470B (en) * | 2017-03-15 | 2018-12-04 | 广州韬普复合材料有限公司 | A kind of environment-protective thermoplastic round tube composite plate |
| CN106985479A (en) * | 2017-04-24 | 2017-07-28 | 福建金诺建材有限公司 | A kind of fire protection flame retarding cellular board and its preparation technology |
| CN107379711A (en) * | 2017-06-15 | 2017-11-24 | 广州云凯复合材料有限公司 | A kind of multifunctional honeycomb board production technology |
| CN107571596A (en) * | 2017-08-30 | 2018-01-12 | 武汉现代精工机械股份有限公司 | A kind of moulding process and its equipment of compound cellular board |
| CN109808186A (en) * | 2017-11-21 | 2019-05-28 | 上海卡彬新材料有限公司 | A kind of cellular thermoplastic composite plate welding equipment and forming method |
| CN108263049A (en) * | 2018-01-16 | 2018-07-10 | 常州凯尔维塑料机械有限公司 | PP glass cellular boards |
| CN108773112B (en) * | 2018-06-19 | 2019-10-22 | 江苏奇一科技有限公司 | A kind of honeycomb core material, cellular board and preparation method thereof and equipment |
| TWI678283B (en) * | 2018-11-09 | 2019-12-01 | 政鈺機械股份有限公司 | Method for manufacturing anti-collision partition |
| CN110437534A (en) * | 2019-07-23 | 2019-11-12 | 广州云凯复合材料有限公司 | A kind of absorption plate and its production technology by force |
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| DE1963623A1 (en) * | 1969-12-19 | 1971-07-15 | Avenarius & Co R | Insulating panel with capillary core and - sealed faces |
| JP2010120315A (en) * | 2008-11-21 | 2010-06-03 | Nakagawa Sangyo Kk | Base material, and method of manufacturing the same |
| CN102328464A (en) * | 2011-08-29 | 2012-01-25 | 姚喜智 | Honeycomb core plate of composite plate and manufacturing process thereof |
| CN202685398U (en) * | 2012-06-11 | 2013-01-23 | 杭州华聚复合材料有限公司 | Honeycomb panel |
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Effective date of registration: 20210527 Address after: 311121 Building No. 2, Huayi Road, Yuhang Street, Yuhang District, Hangzhou City, Zhejiang Province Patentee after: HANGZHOU POLYCORE COMPOSITE MATERIAL Co.,Ltd. Patentee after: ZHEJIANG HUAZHENG NEW MATERIAL GROUP Co.,Ltd. Address before: 311121 Building 2, No.2, Huayi Road, Yuhang street, Yuhang District, Hangzhou City, Zhejiang Province Patentee before: HANGZHOU POLYCORE COMPOSITE MATERIAL Co.,Ltd. |
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