JPH02137781A - Light-weight gypsum board - Google Patents
Light-weight gypsum boardInfo
- Publication number
- JPH02137781A JPH02137781A JP29045588A JP29045588A JPH02137781A JP H02137781 A JPH02137781 A JP H02137781A JP 29045588 A JP29045588 A JP 29045588A JP 29045588 A JP29045588 A JP 29045588A JP H02137781 A JPH02137781 A JP H02137781A
- Authority
- JP
- Japan
- Prior art keywords
- board
- slurry
- pts
- gypsum
- light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000010440 gypsum Substances 0.000 title claims abstract description 27
- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 27
- 239000002002 slurry Substances 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000000839 emulsion Substances 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 239000004094 surface-active agent Substances 0.000 claims abstract description 6
- 229920006243 acrylic copolymer Polymers 0.000 claims abstract description 5
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 4
- 229920005989 resin Polymers 0.000 claims abstract description 4
- 239000011347 resin Substances 0.000 claims abstract description 4
- 239000006260 foam Substances 0.000 claims abstract description 3
- 239000000835 fiber Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000011259 mixed solution Substances 0.000 claims 1
- 230000005484 gravity Effects 0.000 abstract description 6
- 239000011162 core material Substances 0.000 abstract description 5
- 239000003365 glass fiber Substances 0.000 abstract description 3
- 239000010451 perlite Substances 0.000 abstract description 3
- 235000019362 perlite Nutrition 0.000 abstract description 3
- RYAGRZNBULDMBW-UHFFFAOYSA-L calcium;3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Ca+2].COC1=CC=CC(CC(CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O RYAGRZNBULDMBW-UHFFFAOYSA-L 0.000 abstract description 2
- 238000003756 stirring Methods 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 abstract 2
- 238000005266 casting Methods 0.000 abstract 1
- 239000012784 inorganic fiber Substances 0.000 abstract 1
- 239000000123 paper Substances 0.000 description 11
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- WBIQQQGBSDOWNP-UHFFFAOYSA-N 2-dodecylbenzenesulfonic acid Chemical compound CCCCCCCCCCCCC1=CC=CC=C1S(O)(=O)=O WBIQQQGBSDOWNP-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- CKJFPVNRRHVMKZ-UHFFFAOYSA-L calcium;naphthalene-1-sulfonate Chemical compound [Ca+2].C1=CC=C2C(S(=O)(=O)[O-])=CC=CC2=C1.C1=CC=C2C(S(=O)(=O)[O-])=CC=CC2=C1 CKJFPVNRRHVMKZ-UHFFFAOYSA-L 0.000 description 2
- 229920006026 co-polymeric resin Polymers 0.000 description 2
- 229940060296 dodecylbenzenesulfonic acid Drugs 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- -1 shirasu balloons Substances 0.000 description 2
- 239000010455 vermiculite Substances 0.000 description 2
- 235000019354 vermiculite Nutrition 0.000 description 2
- 229910052902 vermiculite Inorganic materials 0.000 description 2
- 229920005789 ACRONAL® acrylic binder Polymers 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 125000005396 acrylic acid ester group Chemical group 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000008240 homogeneous mixture Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011268 mixed slurry Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Laminated Bodies (AREA)
Abstract
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は建材用の軽量石膏ボードに関するものである。[Detailed description of the invention] (Industrial application field) The present invention relates to lightweight gypsum board for building materials.
（従来の技術）
石膏ボードは一般に焼石膏と水をミキサー中で混練して
スラリーとしたものを連続的にコンベアー上を移動する
２枚のボード原紙間に流し込んで一定の厚さに成形して
コンベアー上で硬化後乾燥機を通して余剰水分を蒸発さ
せ乾燥しこれを所定のサイズに切断したものを製品とし
ている。(Prior art) Gypsum board is generally made by kneading calcined gypsum and water in a mixer to form a slurry, which is then poured between two sheets of base paper that are continuously moving on a conveyor to form a slurry to a certain thickness. After curing on a conveyor, the product is passed through a dryer to evaporate excess water and dried, and then cut into a predetermined size.
この際、石膏ボードの軽量化のために一般的には界面活
性剤を泡立て川に使用される。上記の工程中で２枚のボ
ード用の厚紙原紙の間に石膏芯材が強く密着していない
と製品の自重に原紙が耐えられずボロボロになってしま
う。この様な現象を防止するために一般的にはポリビニ
ルアルコールや澱粉が混合されている。このようにして
生産された石膏ボードは一般にその嵩比重は約０．１程
度となり、更にこれを軽量骨材等を加えて改善したもの
でも大体嵩比重は０．６５程度のものである。At this time, surfactants are generally used to make the gypsum board lighter. During the above process, if the gypsum core material is not tightly adhered between the two sheets of cardboard base paper, the base paper will not be able to withstand the weight of the product and will fall apart. To prevent this phenomenon, polyvinyl alcohol and starch are generally mixed. Gypsum boards produced in this manner generally have a bulk specific gravity of about 0.1, and even if this is improved by adding lightweight aggregate or the like, the bulk specific gravity is about 0.65.
本発明は上記の従来の軽量石膏ボードよりもさらに嵩比
重を低いすなわち高化１１！ ０．４０〜０．６５程度
の軽量石膏ボードを製造し、かつボード原紙と石膏芯材
との密着性を強固にし、ボードの強度も通常の石膏ボー
ドと同程度に保持されるような軽量石膏ボードを製造し
ようとするものである。The present invention has a lower bulk specific gravity than the above-mentioned conventional lightweight gypsum board, that is, it has a height of 11! A lightweight gypsum board that produces a lightweight gypsum board with a thickness of about 0.40 to 0.65, has strong adhesion between the board base paper and the gypsum core material, and maintains the strength of the board at the same level as normal gypsum board. The purpose is to manufacture boards.
本発明は上述の課題を解決するためになされたもので、
そのために焼石膏と軽量骨材と繊維を予め混合したもの
を、水と減水剤及びアクリル共重合系樹脂エマルジョン
の均一混合液に投入攪拌し、界面活性剤を発泡させた泡
を練り込んで、混合したスラリーを２枚のボード原紙囚
に流し込んで成形することによって極めて軽量の石膏ボ
ードを得るものである。The present invention was made to solve the above-mentioned problems,
To do this, a pre-mixed mixture of calcined gypsum, lightweight aggregate, and fibers is poured into a homogeneous mixture of water, water reducing agent, and acrylic copolymer resin emulsion, stirred, and foamed with surfactant is mixed in. An extremely lightweight gypsum board is obtained by pouring the mixed slurry into two sheets of board base paper and shaping it.
本発明は上述の構成となっておりボード原紙と石膏芯材
との間の密着性がよくなりボードの強度も良好で、これ
は、アクリル共重合系樹脂エマルジョンを用いて泡によ
って低下したボードの強度を向上させるが石膏粒子間の
強度の接着とボード用紙への密着性を良好ならしめ、さ
らにｌｌ雑の介在によりボード自体の強度が向上するも
のと考えられる。The present invention has the above-mentioned structure, and the adhesion between the board base paper and the gypsum core material is good, and the strength of the board is also good. It is thought that it improves the strength, improves the strong adhesion between the gypsum particles and the adhesion to the board paper, and further improves the strength of the board itself due to the presence of miscellaneous materials.
〔実施例〕
本発明において使用される軽量骨材としてはパーライト
、シラスバルーン、バーミキュライト又は発泡スチレン
ビーズ等の群から選ぶことができる。[Example] The lightweight aggregate used in the present invention can be selected from the group such as perlite, shirasu balloons, vermiculite or expanded styrene beads.
また繊維としてはガラス繊維が適当で繊維長は６〜２５
ｍ＋程度のものが推奨される。Glass fiber is suitable as the fiber, and the fiber length is 6 to 25.
A value of about m+ is recommended.
減水剤としてリグニンスルホン酸カルシ１クムが適当で
、またナフタレンスルホン酸カルシウム系縮合物が良好
である。Calcium ligninsulfonate is suitable as a water reducing agent, and calcium naphthalenesulfonate condensates are also suitable.
８４ｍエマエマルジョン々試験の結果アクリル共重合系
の合成樹脂がよく、とくにアクリル酸エステルスチレン
共重合樹脂系が好適である。As a result of the 84m emulsion test, acrylic copolymer-based synthetic resins are good, and acrylic acid ester styrene copolymer resins are particularly suitable.
この場合エマルジョン濃度は５０％程度の市販品が利用
できる。In this case, a commercial product with an emulsion concentration of about 50% can be used.
泡立て用の界面活性剤としてはアルキルベンゼンスルホ
ン酸系またはドデシルベンゼンスルホン酸系ものが推奨
できる。As the surfactant for foaming, an alkylbenzenesulfonic acid type or a dodecylbenzenesulfonic acid type is recommended.
また使用するボード用原紙は常用のものでもよいが、目
的により一方を水酸化アルミニウム紙、または両方が水
酸化アルミニウム紙等の不燃紙が使用できる。Further, the board base paper used may be a commonly used one, but depending on the purpose, one side may be aluminum hydroxide paper, or both sides may be noncombustible paper such as aluminum hydroxide paper.
本発明において、製品の厚さを７〜３０ａｍとし、製品
の嵩比重を０．４０〜０．６５にする場合、焼石膏と軽
量骨材を混合した粉体をアクリル共重合系樹脂エマルジ
ョン（濃度５０％）を３〜２０重量部の聞で適当に選択
して成形すると石膏芯材とボード用厚紙との密着性がと
くに強固になり軽量で、ボードの強度も通常の石膏ボー
ドと同程度に保持できる。In the present invention, when the thickness of the product is 7 to 30 am and the bulk specific gravity of the product is 0.40 to 0.65, powder mixed with calcined gypsum and lightweight aggregate is mixed into an acrylic copolymer resin emulsion (concentration If 3 to 20 parts by weight of 50%) is appropriately selected and molded, the adhesion between the gypsum core material and the cardboard for the board will be particularly strong, the board will be lightweight, and the strength of the board will be on the same level as regular gypsum board. Can be retained.
本発明方法を更に具体的に説明すれば、焼石膏１００重
は部に対し、パーライト、シラスバルーン、バーミキュ
ライトまたは発泡スチレンビーズ等の群から選ばれた１
種（または混合物でもよい）を３〜２，０重■部、無機
ｌ！維として６〜２５鎮＆のガラス繊維で分散性のよい
もの０．１〜０．５１ｆｉ部を予めよく混合（粉末状の
まま）したもの、水７０〜９０重ａ部に対し、リグニン
スルホン酸カルシウム０．０５〜０．５重１部またはナ
フタレンスルホン酸カルシウム系縮合物０．０５〜１．
０重量部、アクリル−スチレン共重合系樹脂エマルジョ
ン（ｌ Ｉｔ ５０％三菱油化バーデイシュ製アクロナ
ール） ３〜２０重量部を予めよく攪拌混合させた液に
投入攪拌しつつ、これにアルキルベンゼンスルホン酸系
またはドデシルベンゼンスルホン酸系界面活性剤を予め
泡立てた泡を０．１〜１．０重量％練り込んでよく混練
して均一としてスラリーを２枚のボード用厚紙間に流し
込んで成形し、厚さを７〜３０履に規正して製造される
製品の嵩比重は０．４〜０．６５のちのとなる。To explain the method of the present invention more specifically, 100 parts of calcined gypsum is mixed with 1 part selected from the group such as perlite, shirasu balloons, vermiculite, or expanded styrene beads.
3 to 2.0 parts by weight of seeds (or a mixture), 1 part of inorganic! 0.1 to 0.51 parts of glass fiber with good dispersibility of 6 to 25% as a fiber, well mixed (in powder form) in advance, 70 to 90 parts by weight of water, and lignin sulfonic acid. 0.05-0.5 parts by weight of calcium or 0.05-1 parts of calcium naphthalene sulfonate condensate.
0 parts by weight, 3 to 20 parts by weight of acrylic-styrene copolymer resin emulsion (l It 50% Acronal manufactured by Mitsubishi Yuka Bardeish) are added to a well-stirred solution. While stirring, alkylbenzenesulfonic acid or Knead 0.1 to 1.0% by weight of dodecylbenzenesulfonic acid surfactant into the foam, mix well, and make the slurry homogeneous. Pour the slurry between two sheets of cardboard to form the slurry, and adjust the thickness. The bulk specific gravity of products manufactured with a size of 7 to 30 shoes is 0.4 to 0.65.
次に実施例を第１表に示す。Examples are shown in Table 1.
第１表
また製品（各実施例）の性能試験結果は第２表の通りで
あった。Table 1 The performance test results of the products (each example) are shown in Table 2.
第２表
はかなり低くなっており、強度も発泡度も高いにもかか
わらず強度は従来の通常の石膏ボードと殆んど変らない
程度に保持されていることから本発明はその課題を充分
に解決し得たものと考えられる。The results in Table 2 are quite low, and despite the high strength and foaming degree, the strength is maintained at almost the same level as conventional ordinary gypsum board. Therefore, the present invention satisfactorily solves this problem. It seems that the problem could be resolved.
特許出願人 千代口１建材工業株式会社外 −す る （効 果）Patent applicant Chiyoguchi 1 Kenzai Kogyo Co., Ltd. -su Ru (effect)
Claims (1)
に、水と減水剤及びアクリル共重合系樹脂エマルジョン
の混合液に投入攪拌し、界面活性剤を発泡させた泡を練
り込んで混合してなるスラリーを２枚のボード原紙間に
流し込んで成形することを特徴とする軽量石膏ボードの
製造方法。A pre-mixed mixture of calcined gypsum, lightweight aggregate, and fibers, or separately, is added to a mixed solution of water, water reducing agent, and acrylic copolymer resin emulsion and stirred, and the surfactant foam is mixed in. A method for producing lightweight gypsum board, which is characterized by pouring a slurry formed between two sheets of board paper and forming the slurry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29045588A JPH02137781A (en) | 1988-11-17 | 1988-11-17 | Light-weight gypsum board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29045588A JPH02137781A (en) | 1988-11-17 | 1988-11-17 | Light-weight gypsum board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02137781A true JPH02137781A (en) | 1990-05-28 |
Family
ID=17756246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29045588A Pending JPH02137781A (en) | 1988-11-17 | 1988-11-17 | Light-weight gypsum board |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02137781A (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06279149A (en) * | 1993-02-12 | 1994-10-04 | Nichias Corp | Production of fire-resisting lagging material |
| WO1998030515A1 (en) * | 1997-01-07 | 1998-07-16 | National Gypsum Company | Gypsum wallboard, and method of making same |
| CN103104064A (en) * | 2006-09-29 | 2013-05-15 | 美国石膏公司 | Composite light weight gypsum wallboard |
| JP2016052985A (en) * | 2011-02-25 | 2016-04-14 | ユナイテッド・ステイツ・ジプサム・カンパニー | Light weight low density fire resistant gypsum panel |
| US9802866B2 (en) | 2005-06-09 | 2017-10-31 | United States Gypsum Company | Light weight gypsum board |
| US9840066B2 (en) | 2005-06-09 | 2017-12-12 | United States Gypsum Company | Light weight gypsum board |
| CN109354478A (en) * | 2018-12-15 | 2019-02-19 | 成都春天来了建材有限公司 | A kind of lightweight plastering gupsum |
| CN110950621A (en) * | 2019-12-16 | 2020-04-03 | 湖南昌迅科技环保股份有限公司 | Gypsum foamed door core board and preparation method thereof |
| CN111592318A (en) * | 2019-04-29 | 2020-08-28 | 中建材创新科技研究院有限公司 | High-strength high-toughness water-resistant gypsum plaster board and preparation method thereof |
| US11306028B2 (en) | 2005-06-09 | 2022-04-19 | United States Gypsum Company | Light weight gypsum board |
| JP2022078070A (en) * | 2019-03-04 | 2022-05-24 | クナウフ ギプス カーゲー | Method for producing gypsum plaster board |
| US11338548B2 (en) | 2005-06-09 | 2022-05-24 | United States Gypsum Company | Light weight gypsum board |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4917816A (en) * | 1972-06-08 | 1974-02-16 |
-
1988
- 1988-11-17 JP JP29045588A patent/JPH02137781A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4917816A (en) * | 1972-06-08 | 1974-02-16 |
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06279149A (en) * | 1993-02-12 | 1994-10-04 | Nichias Corp | Production of fire-resisting lagging material |
| WO1998030515A1 (en) * | 1997-01-07 | 1998-07-16 | National Gypsum Company | Gypsum wallboard, and method of making same |
| US10406779B2 (en) | 2005-06-09 | 2019-09-10 | United States Gypsum Company | Light weight gypsum board |
| US11884040B2 (en) | 2005-06-09 | 2024-01-30 | United States Gypsum Company | Light weight gypsum board |
| US11338548B2 (en) | 2005-06-09 | 2022-05-24 | United States Gypsum Company | Light weight gypsum board |
| US9802866B2 (en) | 2005-06-09 | 2017-10-31 | United States Gypsum Company | Light weight gypsum board |
| US9840066B2 (en) | 2005-06-09 | 2017-12-12 | United States Gypsum Company | Light weight gypsum board |
| US11306028B2 (en) | 2005-06-09 | 2022-04-19 | United States Gypsum Company | Light weight gypsum board |
| US10407345B2 (en) | 2005-06-09 | 2019-09-10 | United States Gypsum Company | Light weight gypsum board |
| CN103104064A (en) * | 2006-09-29 | 2013-05-15 | 美国石膏公司 | Composite light weight gypsum wallboard |
| CN103104064B (en) * | 2006-09-29 | 2016-12-28 | 美国石膏公司 | composite light weight gypsum board and preparation method thereof |
| US10245755B2 (en) | 2011-02-25 | 2019-04-02 | United States Gypsum Company | Lightweight, reduced density fire rated gypsum panels |
| US10850425B2 (en) | 2011-02-25 | 2020-12-01 | United States Gypsum Company | Lightweight, reduced density fire rated gypsum panels |
| TWI619872B (en) * | 2011-02-25 | 2018-04-01 | 美國吉普森公司 | Gypsum panel and methods of making a gypsum panel |
| US9623586B2 (en) | 2011-02-25 | 2017-04-18 | United States Gypsum Company | Lightweight, reduced density fire rated gypsum panels |
| US11780113B2 (en) | 2011-02-25 | 2023-10-10 | United States Gypsum Company | Lightweight, reduced density fire rated gypsum panels |
| JP2016052985A (en) * | 2011-02-25 | 2016-04-14 | ユナイテッド・ステイツ・ジプサム・カンパニー | Light weight low density fire resistant gypsum panel |
| CN109354478A (en) * | 2018-12-15 | 2019-02-19 | 成都春天来了建材有限公司 | A kind of lightweight plastering gupsum |
| JP2022078070A (en) * | 2019-03-04 | 2022-05-24 | クナウフ ギプス カーゲー | Method for producing gypsum plaster board |
| CN111592318A (en) * | 2019-04-29 | 2020-08-28 | 中建材创新科技研究院有限公司 | High-strength high-toughness water-resistant gypsum plaster board and preparation method thereof |
| CN110950621A (en) * | 2019-12-16 | 2020-04-03 | 湖南昌迅科技环保股份有限公司 | Gypsum foamed door core board and preparation method thereof |
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