JPH08142060A - Production of core, core and mold - Google Patents
Production of core, core and moldInfo
- Publication number
- JPH08142060A JPH08142060A JP32978194A JP32978194A JPH08142060A JP H08142060 A JPH08142060 A JP H08142060A JP 32978194 A JP32978194 A JP 32978194A JP 32978194 A JP32978194 A JP 32978194A JP H08142060 A JPH08142060 A JP H08142060A
- Authority
- JP
- Japan
- Prior art keywords
- core
- sand
- manufacturing
- mold
- molding tool
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/3821—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process composed of particles enclosed in a bag
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は合成樹脂の中空成形品を
加工する場合に使用する中子及びその製造方法と、成形
金型に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core used for processing hollow molded articles of synthetic resin, a method for producing the same, and a molding die.
【0002】[0002]
【従来の技術】従来は低融点合金中子材及び可溶性樹脂
の中子材を前持って中子注型機にて中子を形成し、形成
された中子を射出成形される成形金型のキャビテェーに
内設させ、そのキャビテェー空間部に溶融樹脂を充填し
固化後に内設された中子と一緒に取り出し、後に中子溶
融機で内設された中子を溶融させて取り出し、洗浄工程
を経て合成樹脂の中空成形品を製造する方法が行なわれ
ている。2. Description of the Related Art Conventionally, a molding die in which a core material of a low melting point alloy and a core material of a soluble resin are held in front by a core casting machine, and the formed core is injection molded. The inside of the cavity is filled with molten resin, the cavity is filled with molten resin, and after solidification, it is taken out together with the inside core, and the core inside the core melter is later melted and taken out, and the cleaning process Then, a method for producing a hollow molded article of synthetic resin is carried out.
【0003】[0003]
【発明が解決しようとする課題】しかし、上記低融点合
金中子においては低融点合金を溶かすために150°以
上の高温を必要とすると共に、溶解時に重金属蒸気の発
生により周囲の環境汚染が問題となる。または、可溶性
樹脂の中子においても加熱水溶液の圧送によって樹脂を
溶解しなければならず、多大な設備と作業時間を要する
ものである。However, in the above low melting point alloy core, a high temperature of 150 ° C. or higher is required to melt the low melting point alloy, and the surrounding environmental pollution is caused by the generation of heavy metal vapor during melting. Becomes Alternatively, even in the core of the soluble resin, the resin must be dissolved by pumping the heated aqueous solution, which requires a large amount of equipment and working time.
【0004】[0004]
【課題を解決するための手段】その手段として、砂等の
小粒状の固形体を変形自在な袋や成形体に入れ振動及び
真空引きにて中子を製造する。または、固形体に粘着剤
を混入して中子を製造する。さらに、上記中子を内設し
た成形金型にて構成する。As a means therefor, a small granular solid body such as sand is put in a deformable bag or a molded body to produce a core by vibrating and vacuuming. Alternatively, a core is manufactured by mixing an adhesive agent into a solid body. Further, it is configured by a molding die in which the core is installed.
【0005】[0005]
【実施例】以下、本発明の実施例を詳細に説明する。ま
ず、第1実施例における中子の製造方法は、変形自在な
合成ゴムあるいは軟質塩化ビニール等のフィルムにより
中子5の外形寸法に適合する袋1を形成し、その袋1の
中に数百メッシュの乾燥砂による固形体2を入れる。つ
ぎに、袋1の引口1aに弁4を取り付け、振動装置3の
上面に置き振動を与えながらバルブ4aを開き、真空引
きすることにより固形体2が下方より順次凝縮される。
その後、弁4のハンドル4aを締め中子5を形成するも
のである。EXAMPLES Examples of the present invention will be described in detail below. First, in the method of manufacturing a core in the first embodiment, a bag 1 that conforms to the outer dimensions of the core 5 is formed by a film of deformable synthetic rubber or soft vinyl chloride, and several hundreds are contained in the bag 1. A solid body 2 made of dry sand of a mesh is put. Next, the valve 4 is attached to the pulling port 1a of the bag 1, the valve 4a is opened while being placed on the upper surface of the vibrating device 3 while being vibrated, and the solid body 2 is sequentially condensed from below by vacuuming.
After that, the handle 4a of the valve 4 is tightened to form the core 5.
【0006】第2実施例における中子の製造方法は、上
記と同様の袋21を、左右に分割する金属製の中子成形
具6内に入れた後、袋21に空気を送り込み中子成形具
6の内面に密着させる。つぎに、袋21内に砂等の小粒
状の固形体22を入れ、袋21の引口21aに弁24を
取り付け、振動装置23の上面に置き振動を与えながら
バルブ24aを開き真空引きすることにより固形体22
が下方より順次凝縮される。その後、弁24のハンドル
24aを締め、中子成形具6を左右に開き、中子25を
形成するものである。In the core manufacturing method according to the second embodiment, a bag 21 similar to the above is put in a metal core molding tool 6 which is divided into right and left, and then air is sent into the bag 21 to mold the core. It is brought into close contact with the inner surface of the tool 6. Next, put a small granular solid body 22 such as sand in the bag 21, attach the valve 24 to the inlet 21a of the bag 21, and place the valve 24 on the upper surface of the vibrating device 23 to open the valve 24a while applying vibration to evacuate. Due to the solid body 22
Are sequentially condensed from below. After that, the handle 24a of the valve 24 is tightened, the core molding tool 6 is opened to the left and right, and the core 25 is formed.
【0007】つぎに、第3実施例における中子の製造方
法は、適宜な剛性を有する合成樹脂性(ブロー成形品)
による中子35と同じ形状の成形体31の引口31aに
弁34を取り付け内部空間に上記と同様の固形体32を
入れ、上端に気密性の高い栓31bを挿入する。つづい
て、振動装置33の上面に成形体31を置き、振動を与
えながらハンドル34aを開き、真空引きすることによ
り固形体32及び柱31bが下方に吸引され凝縮された
時点でハンドル34aを締め中子35を形成するもので
ある。Next, in the method of manufacturing the core in the third embodiment, a synthetic resin material (blow molded product) having appropriate rigidity is used.
The valve 34 is attached to the outlet 31a of the molded body 31 having the same shape as the core 35, and the solid body 32 similar to the above is put in the internal space, and the highly airtight stopper 31b is inserted into the upper end. Subsequently, the molded body 31 is placed on the upper surface of the vibration device 33, the handle 34a is opened while applying vibration, and the handle 34a is tightened when the solid body 32 and the pillar 31b are sucked downward and condensed by vacuuming. The child 35 is formed.
【0008】第4実施例における中子の製造方法は、上
記と同様の機能を有する引口41aを設けた成形体41
の内部空間に、上記と同様の固形体42を入れ、上端に
気密性の高い栓41bを挿入する。つづいて、左右に分
割する一方にハンドル44aを設けた弁44を突設した
中子成形具46内に成形体41を引口41aと弁44が
適合するように入れる。その後、振動装置43の上面に
中子成形具46を置き、振動を与えながらハンドル44
aを開き、真空引きすることにより固形体42及び栓4
1bが下方に吸引され凝縮される。最後に、ハンドル4
4aを締め、中子成形具46を開き中子45を形成する
ものである。In the method of manufacturing the core in the fourth embodiment, the molded body 41 provided with the outlet 41a having the same function as described above.
The solid body 42 similar to the above is put in the internal space of the above, and the highly airtight stopper 41b is inserted into the upper end. Subsequently, the molded body 41 is inserted into the core molding tool 46 in which the valve 44 provided with the handle 44a on one of the left and right sides is projected so that the inlet 41a and the valve 44 fit together. After that, the core molding tool 46 is placed on the upper surface of the vibrating device 43, and the handle 44 is vibrated.
a is opened and a vacuum is applied to the solid body 42 and the plug 4
1b is sucked downward and condensed. Finally, handle 4
4a is tightened and the core forming tool 46 is opened to form the core 45.
【0009】第5実施例における中子の製造方法は、弁
54を取り付けた引口56aを下方に設けた上下に分割
する金属製の中子成形具56内に、上記と同様の固形体
52に粘着材をまぜて入れる。つぎに、上方より中子成
形具56内に上記と同様の固形体52を入れ、振動装置
53の上面に置き、振動を与えながらハンドル54aを
開き、真空引きすることにより固形体52に凝縮硬化さ
せる。その後、ハンドル54aを閉め中子成形具56を
上下に分割し、凝縮硬化した固形体52を取り出す。そ
して、固形体52の表面に合成樹脂塗料を塗布し、皮膜
7を形成し中子51を形成する。In the core manufacturing method of the fifth embodiment, a solid core 52 similar to the above is placed in a metal core molding tool 56, which is divided into upper and lower parts and has a lower opening 56a to which a valve 54 is attached. Mix the adhesive in and add. Next, the solid body 52 similar to the above is put into the core molding tool 56 from above, placed on the upper surface of the vibration device 53, the handle 54a is opened while applying vibration, and the solid body 52 is condensed and hardened by vacuuming. Let After that, the handle 54a is closed, the core molding tool 56 is divided into upper and lower parts, and the solid body 52 that has been condensed and hardened is taken out. Then, a synthetic resin paint is applied to the surface of the solid body 52 to form the film 7 and form the core 51.
【0010】第6実施例における中子の製造方法は、弁
64を取り付けた引口66aを下方に設けると共に、上
方に小径の入口66bを設けた上下に分割する金属製の
中子成形具66の内面に、まず離型剤を塗布しその上に
合成樹脂塗料を塗布し、皮膜8を形成する。つぎに、小
径の入口66bより中子成形具66内に上記と同様の固
形体62を入れ、振動装置63の上面に置き、振動を与
えながらハンドル64aを開き、真空引きすることによ
り固形体62を皮膜8に対して凝縮・密着させる。その
後、ハンドル64aを閉め中子成形具66を上下に分割
し、中子61を取り出すものである。なお、必要に応じ
て上記各実施例において固形体に適度な粘着力を有する
粘着剤を混入してもよい。In the core manufacturing method according to the sixth embodiment, a metal core molding tool 66, which is divided into an upper part and a lower part, is provided with an inlet 66a having a valve 64 attached thereto and an upper part having a small diameter inlet 66b. First, a mold release agent is applied to the inner surface of, and a synthetic resin coating material is applied thereon to form a film 8. Next, the solid body 62 similar to the above is put into the core molding tool 66 from the small-diameter inlet 66b, placed on the upper surface of the vibration device 63, the handle 64a is opened while applying vibration, and the solid body 62 is evacuated. Is condensed and adheres to the film 8. After that, the handle 64a is closed and the core molding tool 66 is divided into upper and lower parts, and the core 61 is taken out. If necessary, in each of the above examples, a solid body may be mixed with an adhesive having an appropriate adhesive force.
【0011】最後に成形金型9について説明する。この
成形用金型9は固定金型11と可動金型13により構成
する。射出成形機の射出成形機固定盤10に中子35を
固定密着すべく半円形状の固定部11aを設けた固定金
型11を取り付ける。つぎに、射出成形機可動盤12に
上記と同様な固定部13aを設けた可動金型13を取り
付け、固定部13aに中子35を置く。(図7参照) なお、中子35は真空引きをしている状態のままで置い
てもよい。つづいて、固定金型11と可動金型13とを
型閉し、射出成形機射出シリンダー14より溶融樹脂1
5を射出し、周部空間16に溶融樹脂15を充填する。
(図8参照) 周部空間16にすべて溶融樹脂15を充填した時点で冷
却し、硬化させる。(図9参照) 硬化終了後、可動金型13を移動させ、エジクターピン
17にて中空成形品18を取り出す。(図10・図11
参照) 取り出された中空成形品18の中子35のハンドル34
aを開き、栓31bを取り外し、中の固形体32を取り
除く。(図12・図13参照) つぎに、中空成形品18における成形体31の上下部3
1cおよびスプル19等の不用部分を切り離し、中空成
形品18が完成する。(図14・図15参照) なお、固形体は砂に限定せず同様の機能を有するもので
なければ他のものでもよい。Finally, the molding die 9 will be described. The molding die 9 is composed of a fixed die 11 and a movable die 13. A fixed mold 11 provided with a semi-circular fixing portion 11a is fixed to the injection molding machine fixing plate 10 of the injection molding machine so as to fix and tightly attach the core 35 thereto. Next, the movable mold 13 provided with the fixed portion 13a similar to the above is attached to the movable platen 12 of the injection molding machine, and the core 35 is placed on the fixed portion 13a. (See FIG. 7) The core 35 may be left in a vacuumed state. Subsequently, the fixed mold 11 and the movable mold 13 are closed, and the molten resin 1 is injected from the injection molding machine injection cylinder 14.
5 is injected to fill the peripheral space 16 with the molten resin 15.
(Refer to FIG. 8) When the peripheral space 16 is completely filled with the molten resin 15, it is cooled and cured. (See FIG. 9) After curing, the movable mold 13 is moved, and the hollow molded product 18 is taken out by the ejector pin 17. (Figs. 10 and 11
Reference) Handle 34 of core 35 taken out of hollow molded product 18
a is opened, the plug 31b is removed, and the solid body 32 therein is removed. (See FIGS. 12 and 13) Next, the upper and lower parts 3 of the molded body 31 of the hollow molded product 18
Unnecessary parts such as 1c and the sprue 19 are cut off to complete the hollow molded product 18. (See FIGS. 14 and 15) Note that the solid body is not limited to sand and may be any other body as long as it does not have a similar function.
【0012】[0012]
【発明の効果】本発明によれば砂等の小粒状の固形体を
変形自在な袋や成形体あるいは中子成形具内に入れて成
形することにより、中子の製造が容易にしかも確実に行
なわれると共に、中空成形品加工後の取り外しも簡単に
行なえる。また、成形金型も簡易な構造で、完成度の高
い中空成形品を成形できるものである。According to the present invention, a small granular solid such as sand is put into a deformable bag, a molded body or a core molding tool for molding, so that the core can be easily and surely manufactured. In addition to being carried out, the hollow molded product can be easily removed after processing. Further, the molding die has a simple structure and can form a hollow molded product having a high degree of completion.
【図1】本発明の第1実施例の中子の製造方法における
形成工程図。FIG. 1 is a process drawing of a core manufacturing method according to a first embodiment of the present invention.
【図2】本発明の第2実施例の中子の製造方法における
形成工程図。FIG. 2 is a diagram showing a forming process in a method for manufacturing a core according to a second embodiment of the present invention.
【図3】本発明の第3実施例の中子の製造方法における
形成工程図。FIG. 3 is a view showing a forming process in a method for manufacturing a core according to a third embodiment of the present invention.
【図4】本発明の第4実施例の中子の製造方法における
形成工程図。FIG. 4 is a process drawing of a core manufacturing method according to a fourth embodiment of the present invention.
【図5】本発明の第5実施例の中子の製造方法における
形成工程図。FIG. 5 is a process drawing of a core manufacturing method according to a fifth embodiment of the present invention.
【図6】本発明の第6実施例の中子の製造方法における
形成工程図。FIG. 6 is a view showing a forming process in a method for manufacturing a core according to a sixth embodiment of the present invention.
【図7】本発明の成形金型に中子を置いた状態図。FIG. 7 is a state diagram in which a core is placed in the molding die of the present invention.
【図8】本発明の成形金型に溶融樹脂を充填している状
態図。FIG. 8 is a diagram showing a state where a molding die of the present invention is filled with molten resin.
【図9】本発明の成形金型を冷却している状態図。FIG. 9 is a state diagram of cooling the molding die of the present invention.
【図10】本発明の成形金型を型開した状態図。FIG. 10 is a state diagram in which the molding die of the present invention is opened.
【図11】本発明の成形金型における中空成形品を取り
出した状態図。FIG. 11 is a state diagram of a hollow molded product taken out of the molding die of the present invention.
【図12】本発明の中空成形品における中子の栓を取り
出した状態図。FIG. 12 is a view showing a state where a core plug of the hollow molded article of the present invention is taken out.
【図13】本発明の中空成形品における中子内になる固
形体を取り出した状態図。FIG. 13 is a view showing a state in which a solid body in the core of the hollow molded article of the present invention is taken out.
【図14】本発明の成形体等の不用部分を取り除いた状
態図。FIG. 14 is a state diagram in which an unnecessary portion of the molded product of the present invention is removed.
【図15】本発明の中空成形品の断面図。FIG. 15 is a sectional view of the hollow molded article of the present invention.
1 袋 2 固形体 3 振動装置 4 弁 5 中子 6 中子成形具 7 皮膜 8 皮膜 9 成形金型 1 bag 2 solid body 3 vibrating device 4 valve 5 core 6 core molding tool 7 film 8 film 9 molding die
Claims (8)
入れ、振動及び真空引きにて中子を形成させることを特
徴とする中子の製造法とその中子。1. A method of manufacturing a core and a core thereof, wherein a small granular solid such as sand is put in a deformable bag and the core is formed by vibration and vacuuming.
具内に入れた後、袋に空気を送り込み、次にその中に砂
等の小粒状の固形体を入れ、振動及び真空引きにより中
子を形成することを特徴とする中子の製造方法とその中
子。2. The deformable bag according to claim 1 is placed in a core molding tool, air is blown into the bag, and then small solid particles such as sand are placed therein, and vibration and vacuum are applied. A method for manufacturing a core, which comprises forming the core by pulling, and the core.
状の成形体の内部空間に充填し、振動及び真空引きにて
中子を形成させることを特徴とする中子の製造及びその
中子。3. A core manufacturing method comprising filling a small granular solid body such as sand into an inner space of a molded body having the same shape as the core and forming the core by vibrating and vacuuming. And its core.
入れた後、成形体内に砂等の小粒状の固形体を入れ、振
動及び真空引きにより中子を形成することを特徴とする
中子の製造方法とその中子。4. The core according to claim 3 is placed in a core molding tool, and then a small granular solid such as sand is placed in the molding to form a core by vibrating and vacuuming. The manufacturing method of the core and the core.
入れ、振動及び真空引きにて形成した中子の外周に、合
成樹脂の等の皮膜を形成させることを特徴とする中子の
製造方法及びその中子。5. A small granular solid body such as sand is put in a core molding tool, and a film of synthetic resin or the like is formed on the outer periphery of the core formed by vibration and vacuum evacuation. Core manufacturing method and the core.
皮膜を形成し、その中に砂等の小粒状の固形体を入れ、
振動及び真空引きにより中子を形成することを特徴とす
る中子の製造方法とその中子。6. An inner surface of the core molding tool is formed with a film made of a synthetic resin or the like, and small solid particles such as sand are put therein,
A core manufacturing method and a core, wherein the core is formed by vibration and vacuuming.
てなることを特徴とする請求項1から6記載の中子の製
造方法とその中子。7. The method for producing a core and the core thereof according to claim 1, wherein an adhesive is mixed in a small granular solid such as sand.
その中子の一部を金型内に固定すべく固定部を設けたこ
とを特徴とする成形金型。8. The core obtained in each of the above claims is internally provided,
A molding die having a fixing portion for fixing a part of the core in the die.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP32978194A JPH08142060A (en) | 1994-11-21 | 1994-11-21 | Production of core, core and mold |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP32978194A JPH08142060A (en) | 1994-11-21 | 1994-11-21 | Production of core, core and mold |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH08142060A true JPH08142060A (en) | 1996-06-04 |
Family
ID=18225200
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP32978194A Pending JPH08142060A (en) | 1994-11-21 | 1994-11-21 | Production of core, core and mold |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH08142060A (en) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000001520A1 (en) * | 1998-07-03 | 2000-01-13 | Bonus Energy A/S | Method for producing closed composite structures and moulding apparatus to be used by the method |
JP2005074950A (en) * | 2003-09-03 | 2005-03-24 | Araco Corp | Manufacturing process of shaped body |
DE102005056420A1 (en) * | 2005-11-26 | 2007-05-31 | Bayerische Motoren Werke Ag | Producing a mold core for making hollow fiber-reinforced plastic parts comprises filling a plastic bag with particles in a mold, compacting the particles by vibration, evacuating the mold and sealing the bag |
JP2009542461A (en) * | 2006-07-06 | 2009-12-03 | エアバス ドイチェランド ゲゼルシャフト ミット ベシュレンクテル ハフツング | Manufacturing method of fiber composite parts for aerospace |
JP2009542494A (en) * | 2006-07-06 | 2009-12-03 | エアバス ドイチェランド ゲゼルシャフト ミット ベシュレンクテル ハフツング | Method for producing composite fiber component using molded core material and molded core material thereof |
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-
1994
- 1994-11-21 JP JP32978194A patent/JPH08142060A/en active Pending
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WO2000001520A1 (en) * | 1998-07-03 | 2000-01-13 | Bonus Energy A/S | Method for producing closed composite structures and moulding apparatus to be used by the method |
CZ302171B6 (en) * | 2000-03-31 | 2010-11-24 | Stahlgruber Otto Gruber Ag | Method of vulcanizing or cross-linking sections of shaped bodies particularly that of rubber mixtures and apparatus for making the method |
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DE102005056420A1 (en) * | 2005-11-26 | 2007-05-31 | Bayerische Motoren Werke Ag | Producing a mold core for making hollow fiber-reinforced plastic parts comprises filling a plastic bag with particles in a mold, compacting the particles by vibration, evacuating the mold and sealing the bag |
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JP2009542493A (en) * | 2006-07-06 | 2009-12-03 | エアバス ドイチェランド ゲゼルシャフト ミット ベシュレンクテル ハフツング | Method of manufacturing composite fiber parts for use in aircraft or spacecraft, molded core material, and composite fiber parts obtained therefrom |
JP2009542494A (en) * | 2006-07-06 | 2009-12-03 | エアバス ドイチェランド ゲゼルシャフト ミット ベシュレンクテル ハフツング | Method for producing composite fiber component using molded core material and molded core material thereof |
US8906489B2 (en) | 2006-07-06 | 2014-12-09 | Airbus Operations Gmbh | Method for producing a fibre composite component for aviation and spaceflight |
US9492974B2 (en) | 2006-07-06 | 2016-11-15 | Airbus Operations Gmbh | Method for producing a fiber composite component for aviation and spaceflight |
JP2009542461A (en) * | 2006-07-06 | 2009-12-03 | エアバス ドイチェランド ゲゼルシャフト ミット ベシュレンクテル ハフツング | Manufacturing method of fiber composite parts for aerospace |
US10207463B2 (en) | 2006-07-06 | 2019-02-19 | Airbus Operations Gmbh | Method for producing a fiber composite component for aerospace |
US7758793B2 (en) * | 2007-12-06 | 2010-07-20 | Saab Ab | Method and apparatus for manufacturing of an article including an empty space |
TWI616295B (en) * | 2012-09-19 | 2018-03-01 | 渥班資產公司 | Process for the production of wind power installation rotor blades and for the production of a mould core for same |
US10035317B2 (en) | 2012-09-19 | 2018-07-31 | Wobben Properties Gmbh | Process for the production of wind power installation rotor blades and for the production of a mold core for same |
EP3159129A1 (en) * | 2015-10-22 | 2017-04-26 | Evonik Röhm GmbH | Preparation of complex foam or sandwich hollow structures by means of a mould core |
WO2017067867A3 (en) * | 2015-10-22 | 2017-06-15 | Evonik Röhm Gmbh | Production of complex hollow foam or sandwich structures by means of a mold core |
US10919198B2 (en) | 2015-10-22 | 2021-02-16 | Evonik Operations Gmbh | Production of complex hollow foam or sandwich structures by means of a mold core |
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