JPS6315731A - Manufacturing device for synthetic resin foamed molded form - Google Patents
Manufacturing device for synthetic resin foamed molded formInfo
- Publication number
- JPS6315731A JPS6315731A JP61160243A JP16024386A JPS6315731A JP S6315731 A JPS6315731 A JP S6315731A JP 61160243 A JP61160243 A JP 61160243A JP 16024386 A JP16024386 A JP 16024386A JP S6315731 A JPS6315731 A JP S6315731A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- surface pressure
- mold
- synthetic resin
- foamed molded
- 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
- 229920003002 synthetic resin Polymers 0.000 title claims abstract description 21
- 239000000057 synthetic resin Substances 0.000 title claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 239000002245 particle Substances 0.000 claims abstract description 14
- 238000000465 moulding Methods 0.000 claims abstract description 9
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 9
- 239000004416 thermosoftening plastic Substances 0.000 claims abstract description 9
- 238000001514 detection method Methods 0.000 claims description 28
- 239000006260 foam Substances 0.000 claims description 21
- 238000009423 ventilation Methods 0.000 claims description 4
- 238000005187 foaming Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 3
- 229920013716 polyethylene resin Polymers 0.000 abstract description 2
- 230000037303 wrinkles Effects 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 abstract 3
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 230000036772 blood pressure Effects 0.000 description 9
- 238000001816 cooling Methods 0.000 description 6
- 238000010097 foam moulding Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は熱可塑性合成樹脂の予（Ｊｆ＃発泡粒子を原料
とする合成樹脂発泡成形体の製造装置に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an apparatus for producing a synthetic resin foam molded article using preformed (Jf# foamed particles of thermoplastic synthetic resin) as a raw material.
（従来の技術）
熱可塑性合成樹脂の予備発泡粒子を成形用型内に充填し
て加熱することにより発泡融着させて発泡成形体とする
合成樹脂発泡体の製造Ｔ程において、成形用型内で成形
された発泡成形体を型内への気体の供給により加圧して
安定化を図るようにすることは特公昭６１−１４９３５
号公報などによって既に堤案されている。(Prior art) In step T of manufacturing a synthetic resin foam, pre-expanded particles of a thermoplastic synthetic resin are filled into a mold and heated to form a foamed molded product. Japanese Patent Publication No. 61-14935 discloses that the foam molded product molded in the mold is pressurized and stabilized by supplying gas into the mold.
The embankment has already been proposed in the Publication No.
（発明が解決しようとする問題点）
ところが、従来ζＪ気体の供給を発泡成形体の発泡圧と
は無関係にチャンバー部から行うようにしているため、
加圧不足や力１０濾過剰が生じ、良質の製品を量産し難
いという問題点があった。(Problems to be Solved by the Invention) However, in the past, the ζJ gas was supplied from the chamber regardless of the foaming pressure of the foamed molded product.
There were problems in that insufficient pressurization and excessive filtration occurred, making it difficult to mass-produce high-quality products.
（問題点を解決するための手段）
本発明は前記のような問題点を解決できる合成樹脂発泡
酸゛形体の製造装置に関するもので、熱可塑性合成樹脂
の予備発泡粒子を成形用型内で加熱して発泡成形するよ
うにした合成樹脂発泡成形体の製造装置において、成形
用型の所要個所に面圧検出口を設けてこれに面圧計の検
出端を臨まゼるとともに該成形用型に加圧源と接続され
た加圧弁と排出弁とを設け、該加圧弁と排出弁は前記面
圧計に圧力発信器と演算器とを介して接続されている圧
力指示調節計に接続させ、面圧計により測定された面圧
に基づく圧力信号を圧力発信器から演算器に送り、これ
に設定しである指令値に従い圧力指示調節計を作動させ
て加圧弁または排出弁を開閉するようにして成形用型内
の発泡成形体に最適な圧力で気体を供給できるようにし
たものである。(Means for Solving the Problems) The present invention relates to an apparatus for manufacturing a synthetic resin foamed acid form that can solve the above-mentioned problems, and in which pre-expanded particles of a thermoplastic synthetic resin are heated in a mold. In an apparatus for producing a synthetic resin foam molded article, a mold is provided with surface pressure detection ports at required locations, and the detection end of a surface pressure meter is placed in the mold. A pressurizing valve and a discharge valve are provided which are connected to a pressure source, and the pressurizing valve and the discharge valve are connected to a pressure indicating controller which is connected to the surface pressure gauge via a pressure transmitter and a calculator. A pressure signal based on the measured surface pressure is sent from the pressure transmitter to the computer, and the pressure indicating controller is operated according to the command value set therein to open and close the pressure valve or discharge valve. This allows gas to be supplied to the foam molded product inside the mold at an optimal pressure.
（作用）
このような合成樹脂発泡成形体の製造装置は、熱可塑性
合成樹脂の予備発泡粒子を型合わセされた成形用型内に
充填後チャンバー部に加圧蒸気を供給して予備発泡粒子
を型内で発泡融着させることにより発泡成形体とするま
での工程は従来のこの種の成形装置と同様であるが、成
形用型内において発泡成形体が成形されてくると該成形
用型の所要個所に設けである面圧検出口に面圧計の検出
端が臨んでいるので、発泡成形体の発泡圧が面圧計によ
り測定され、この測定された血圧が圧力信号として圧力
発信器を通して演算器に送られ、該演算器に予め設定し
である指令値に従い圧力指示調節計が加圧弁を開いて成
形用型に所定の圧力の気体を送り、成形用型内の圧力を
圧力指示調節計の指示で開閉される加圧弁と排出弁の開
閉で所定圧に保ちながら発泡成形体の冷却と安定化が行
われることとなる。(Function) Such a manufacturing device for synthetic resin foam moldings supplies pre-expanded particles of thermoplastic synthetic resin into a mold that has been fitted together, and then supplies pressurized steam to a chamber section to form the pre-expanded particles. The process of forming a foam molded product by foaming and fusing in a mold is the same as in conventional molding equipment of this type, but once the foam molded product is molded in the mold, the mold Since the detection end of the surface pressure meter faces the surface pressure detection port provided at the required location, the foaming pressure of the foamed molded product is measured by the surface pressure meter, and this measured blood pressure is calculated as a pressure signal through the pressure transmitter. The pressure indicator controller opens the pressure valve to send gas at a predetermined pressure to the mold, and the pressure in the mold is controlled by the pressure controller. The foamed molded product is cooled and stabilized while maintaining a predetermined pressure by opening and closing the pressurizing valve and the discharge valve, which are opened and closed according to the instructions.
（実施例）
次に、本発明を図示の実施例について詳細に説明すれば
、ｆｉｌ、＋１１はキャビティ部（２）、（２）を有す
る一対の成形用型であって、図示されない蒸気供給管と
接続されたチャンバー部（１ａ）を備え、該チャンバー
部（１ａ）はキャビティ部（２）、（２）に蒸気供給孔
（１ｂ）により連通されるとともに、キャビティ部（２
）、（２）を原料充填装置に接続させた周知の構造のも
のである。（３）は一方の成形用型（１）のキャビティ
部（２）の中央に設けられた面圧検出口であって、該面
圧検出口（３）は面圧計（４）の盤状の検出端（５）に
より閉塞され、該検出端（５）には通気小孔（６）が適
数個配設されている。面圧計（４）は前記検出端（５）
の背面′中火に連結された検出棒（７）の後端に面圧計
本体（８）を取付けるとともに、スリーブ（９）をその
先端が面圧検出口（３）に接続された状態で取付けて該
面圧検出口（３）の後方に成形用型ｉ１１のチャンバー
部（１ａ）と遮断される常圧の筒状室（１０）を形成し
、この筒状室（１０）の中央に前記検出棒（７）がスリ
ーブ′後端の蓋（１０ａ）に挿通保持さたものとして位
置され、該筒状室００）は圧力調整口（１１）をもって
大気に連通されて通気小孔（６）からチャンバー部（１
ａ）内に供給される蒸気や後記する力ｉ圧気体により影
響されることなく一定圧を保ようになっている。（１２
）は面圧計（４）の面圧Ｓ４本体（８）に接続される圧
力発信器であって、該圧力発信器（１２）には演算器（
１３）としてのレシオ・バイアス演算器が接続され、こ
の演算器（１３）には圧力指示調節器（１４）を接続し
てこの圧力指示調節器（１４）からの指゛示で図示しな
い加圧源と一方の成形用型（１）とを接続している供給
管路（１５）の加圧弁（１６）の開閉と、他方の成形用
型（１）内を大気に連通させる排出管路（１７）の排出
弁（１８）の開閉とを行えるようになっており、該排出
弁（１８）と前記圧力指示調節器（１４）との間には加
減算器（１９）を介装しである。なお、図中（２０）は
チャンバー内圧のフィードバック回路であり、チャンバ
ー内圧を測定してその測定値を圧力指示調節器（１４）
にフィードハックすることにより圧力指示調節器（１４
）からの指令値をより適正なものとするために設けられ
ている。(Embodiment) Next, the present invention will be described in detail with reference to the illustrated embodiment. fil, +11 is a pair of molding molds having cavity parts (2), (2), and a steam supply pipe (not shown). The chamber part (1a) is connected to the cavity parts (2), (2) through a steam supply hole (1b), and the chamber part (1a) is connected to the cavity part (2).
) and (2) are of a well-known structure connected to a raw material filling device. (3) is a surface pressure detection port provided in the center of the cavity part (2) of one of the molds (1), and the surface pressure detection port (3) is a plate-shaped surface pressure sensor (4). It is closed by a detection end (5), and an appropriate number of small ventilation holes (6) are provided in the detection end (5). The surface pressure gauge (4) is connected to the detection end (5).
Attach the surface pressure gauge body (8) to the rear end of the detection rod (7) connected to the medium flame, and install the sleeve (9) with its tip connected to the surface pressure detection port (3). A normal pressure cylindrical chamber (10) which is isolated from the chamber part (1a) of the mold i11 is formed behind the surface pressure detection port (3), and the The detection rod (7) is inserted and held in the cover (10a) at the rear end of the sleeve, and the cylindrical chamber 00) is communicated with the atmosphere through the pressure adjustment port (11) and the small ventilation hole (6). From the chamber part (1
a) It is designed to maintain a constant pressure without being affected by the steam supplied inside or the pressure gas described later. (12
) is a pressure transmitter connected to the surface pressure S4 body (8) of the surface pressure gauge (4), and the pressure transmitter (12) is equipped with a computing unit (
A ratio/bias calculator (13) is connected to the calculator (13), and a pressure indicating regulator (14) is connected to the pressure indicating regulator (14) to apply pressure (not shown) according to instructions from the pressure indicating regulator (14). The pressurizing valve (16) of the supply pipe (15) connecting the source and one mold (1) is opened and closed, and the discharge pipe (16) which connects the inside of the other mold (1) with the atmosphere is controlled. 17) The discharge valve (18) can be opened and closed, and an adder/subtractor (19) is interposed between the discharge valve (18) and the pressure indicating regulator (14). . Note that (20) in the figure is a feedback circuit for the chamber internal pressure, which measures the chamber internal pressure and sends the measured value to the pressure indicator regulator (14).
Pressure indicating regulator (14
) is provided to make the command value from ) more appropriate.
このように構成されたものは、ポリエチレン樹脂などの
熱可塑性合成樹脂の予備発泡粒子を型合わせした成形用
型（１１、（１）により形成されるキャビティ部（２）
に充填し、チャンバー部（１ａ）に供給される加圧蒸気
で予備発泡粒子を発泡融着さ゛せて発泡成形体をキャビ
ティ部（２）内において成形すること吉なるが、このと
き発泡成形体が発泡に、Ｌり面圧計（４）の検出端（５
）を押して検出棒（７）を押し、発泡成形体の血圧が面
圧計本体（８）で測定される。この場合第２図に示すよ
うに、検出端（５）と検出棒（７）はこれを囲んで設（
）られたスリーブ（９）の中にあり、スリーブ（９）に
設ｉｔられた圧力調整口（１１）を開放してスリーブ（
９）内の筒状室００）を大気圧と同等の圧力状態とし２
であるので、面圧計（４）はキャビティ部（２）内の圧
力に関係なく適正面圧を検出する。そして、？Ｎ 算器
（１３）としてのレシオ・バイアス演算器に設定した指
令値に従い送信する動作信号を、発泡体面圧に対して一
定値が加圧、減圧された指令値として送信すると、冷却
完Ｙまで発泡成形体を一様に加圧または減圧した状態で
冷却して安定化できるし２、発泡体面圧に対して一定比
率の値が加圧、減圧された指令値として送信すると、血
圧が高いときはチャンバー部（１ａ）内の圧力と血圧と
の差を大きくし、血圧が低くなるにつれてチャンバー部
（１ａ）内の圧力と面圧の差を小さくして冷却すること
ができるので、両者の併用により発泡成形体の血圧に対
応して最適の力１１圧が常に行われることとなる。この
ようにして冷却安定化が行われると、熱可塑性合成樹脂
の発泡成形体が冷却完了するまでの間、発泡成形体の中
のガスが気散しないうえに圧入することも可能となり、
従って、発泡成形体の収縮やしわ寄りもヰしなくなり、
また、血圧が大気圧に近くなった状態にして離型すると
、成形された発泡成形体の膨張は小さく、表面にヒビ割
れを／−Ｖすることもない。なお、成形用型（１）の血
圧検出ｒ−１を閉塞している検出端（５）の通気小孔（
６）からは蒸気や加圧用の気体が筒状室（１０）を経て
圧力調整ＩＴＩ（１１）から大気中にＪＪＩ出されるか
ら、筒状室（１０）内ＬＪ常圧に保持されて面圧検出が
常に適正に行われる。このようにして、予備発泡成粒子
が加熱によって融着して成形された型内の発泡成形体の
血圧を連続して測定し、レシオ・バイアス演算器とＩＥ
圧力発信器介し７て圧力調節指示器により加圧弁と排出
弁が開閉され、発泡成形体の面圧に対して一定の圧力を
加圧または減圧しながら、あるいは血圧に対して一定比
率の圧力を加圧またハ減圧しながら発泡成形体を冷却す
るから、冷却を完了して発泡成形体を離型するときには
、発泡成形体の収縮、膨張はほとんどない。This structure has a cavity part (2) formed by a mold (11, (1)) formed by molding pre-expanded particles of thermoplastic synthetic resin such as polyethylene resin.
It is advisable to fill the cavity with pressurized steam supplied to the chamber part (1a) and foam and fuse the pre-expanded particles to form a foam molded product in the cavity part (2). For foaming, the detection end (5) of the L-shaped surface pressure gauge (4)
) to push the detection rod (7), and the blood pressure of the foam molded body is measured with the surface pressure meter body (8). In this case, as shown in Fig. 2, the detection end (5) and the detection rod (7) are placed around it
) in the sleeve (9), and open the pressure adjustment port (11) installed in the sleeve (9) to remove the sleeve (
9) Make the cylindrical chamber 00) in a pressure state equivalent to atmospheric pressure 2
Therefore, the surface pressure gauge (4) detects the appropriate surface pressure regardless of the pressure inside the cavity (2). and,? N When the operation signal is sent according to the command value set to the ratio/bias calculator (13) as a command value that is pressurized or depressurized by a constant value with respect to the foam surface pressure, it will continue until cooling is complete Y. The foam molded body can be stabilized by cooling it in a uniformly pressurized or depressurized state, and if the command value is sent as a command value that is a constant ratio of the foam surface pressure to the pressurized or depressurized state, it can be used when blood pressure is high. The method increases the difference between the pressure inside the chamber part (1a) and the blood pressure, and as the blood pressure decreases, the difference between the pressure inside the chamber part (1a) and the surface pressure can be decreased to achieve cooling. Accordingly, the optimum force 11 pressure is always applied in accordance with the blood pressure of the foamed molded article. When cooling is stabilized in this way, the gas in the foamed molded product does not dissipate until the thermoplastic synthetic resin foamed molded product is completely cooled, and it is also possible to press-fit it.
Therefore, the foam molded product will not shrink or wrinkle,
Moreover, when the mold is released in a state where the blood pressure is close to atmospheric pressure, the expansion of the molded foamed product is small and no cracks are formed on the surface. In addition, the ventilation hole (
From 6), steam and pressurizing gas pass through the cylindrical chamber (10) and are discharged into the atmosphere from the pressure adjustment ITI (11), so the LJ inside the cylindrical chamber (10) is maintained at normal pressure and the surface pressure increases. Detection is always performed properly. In this way, the blood pressure of the foamed product in the mold, in which the pre-expanded particles are fused and molded by heating, is continuously measured, and the ratio bias calculator and IE
The pressurization valve and the discharge valve are opened and closed by the pressure adjustment indicator via the pressure transmitter 7, and a constant pressure is applied or reduced to the surface pressure of the foamed molded product, or a pressure at a constant ratio to the blood pressure is applied. Since the foamed molded product is cooled while applying pressure or depressurizing, there is almost no contraction or expansion of the foamed molded product when cooling is completed and the foamed molded product is released from the mold.
（発明の効果）
本発明は前記説明から明らかなように、成形用型にカロ
圧源と接続された加圧弁と排出弁とを設けてごれらを成
形用型内の発泡成形体の面圧変化に応し作動する圧力指
示調節計からの信号で開閉されるようにしたので、発泡
成形体を加圧する気体の圧力を適度に調整でき、加圧不
足や加圧過剰によるしわ寄りその他製品不良の生ずるこ
とのない冷却安定化が行えて良質の合成樹脂発泡製品を
量産できるもので、構造が簡単で故障もなくて長期耐用
できるうえに演算器に設定される指令値を変更するだけ
で各種の熱可塑性合成樹脂の予備発泡成粒子に最適の加
圧条件が得られる等種々の利点があり、従来のこの種合
成樹脂発泡成形体の製造装置の問題点を解決したものと
して業界の発展に寄」ｊ−するところ極めて大なもので
ある。(Effects of the Invention) As is clear from the above description, the present invention provides a mold with a pressurizing valve and a discharge valve connected to a Calo pressure source to remove debris from the surface of the foam molded product in the mold. Since it is opened and closed by a signal from a pressure indicator controller that operates in response to pressure changes, the pressure of the gas that pressurizes the foam molded product can be adjusted appropriately, and the product can be prevented from wrinkling due to insufficient or excessive pressure. It enables mass production of high-quality synthetic resin foam products by stabilizing cooling without causing defects.It has a simple structure, has no failures, can be used for a long time, and can be used simply by changing the command value set in the computer. It has various advantages such as the ability to obtain optimal pressurizing conditions for pre-expanded particles of various thermoplastic synthetic resins, and has helped to develop the industry as a solution to the problems of conventional manufacturing equipment for this type of synthetic resin foam molding. It is an extremely large amount.
第１図は本発明の実施例を示す概略説明図、第２図は同
じく要部の一部切欠正面図である。
（１）：成形用型、（Ｉａ）： チャンバー部、（３）
：面圧検出口、（４）：面圧計、（５）：検出端、（６
１：ｉ［気小孔、（７）：検出棒、（８）：面圧計本体
、（９）： スリーブ、００）： 筒状室、（１２）
：圧力発信器、（＋３） ： 演算器、（１４） ：
圧力指示調節器、（１６）： 加圧弁、（１８） ：排
出弁。FIG. 1 is a schematic explanatory diagram showing an embodiment of the present invention, and FIG. 2 is a partially cutaway front view of the main part. (1): Molding mold, (Ia): Chamber part, (3)
: Surface pressure detection port, (4): Surface pressure gauge, (5): Detection end, (6
1: i [stomatal hole, (7): detection rod, (8): pressure gauge body, (9): sleeve, 00): cylindrical chamber, (12)
: Pressure transmitter, (+3) : Arithmetic unit, (14) :
Pressure indicating regulator, (16): Pressure valve, (18): Discharge valve.
Claims (1)
熱して発泡成形するようにした合成樹脂発泡成形体の製
造装置において、成形用型の所要個所に面圧検出口を設
けてこれに面圧計の検出端を臨ませるとともに該成形用
型に加圧源と接続された加圧弁と排出弁とを設け、該加
圧弁と排出弁は前記面圧計に圧力発信器と演算器とを介
して接続されている圧力指示調節計に接続させたことを
特徴とする合成樹脂発泡成形体の製造装置。 ２、面圧計が、面圧検出口を閉塞する通気小孔付の盤状
の検出端と、該検出端に連結されて面圧計本体に先端が
達する検出棒と、面圧検出口に一端が接続されてその後
方に成形用型のチャンバー部とは遮断された常圧の筒状
室を形成するスリーブとよりなるものである特許請求の
範囲第１項記載の合成樹脂発泡成形体の製造装置。 ３、演算器が、レシオ・バイアス演算器である特許請求
の範囲第１項または第２項記載の合成樹脂発泡成形体の
製造装置。[Scope of Claims] 1. In an apparatus for producing a synthetic resin foam molded article in which pre-expanded particles of a thermoplastic synthetic resin are heated and foam-molded in a mold, surface pressure is applied to required parts of the mold. A detection port is provided to face the detection end of the surface pressure gauge, and the mold is also provided with a pressure valve connected to a pressure source and a discharge valve, and the pressure valve and discharge valve transmit pressure to the surface pressure gauge. 1. An apparatus for producing a synthetic resin foam molded article, characterized in that the apparatus is connected to a pressure indicating controller which is connected via a device and a computing device. 2. The surface pressure gauge has a disc-shaped detection end with a small ventilation hole that closes the surface pressure detection port, a detection rod that is connected to the detection end and whose tip reaches the surface pressure meter body, and one end of which is connected to the surface pressure detection port. The apparatus for manufacturing a synthetic resin foam molded article according to claim 1, which comprises a sleeve connected to the rear thereof to form a cylindrical chamber at normal pressure and isolated from the chamber part of the molding die. . 3. The apparatus for manufacturing a synthetic resin foam molded article according to claim 1 or 2, wherein the computing unit is a ratio/bias computing unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61160243A JPS6315731A (en) | 1986-07-08 | 1986-07-08 | Manufacturing device for synthetic resin foamed molded form |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61160243A JPS6315731A (en) | 1986-07-08 | 1986-07-08 | Manufacturing device for synthetic resin foamed molded form |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6315731A true JPS6315731A (en) | 1988-01-22 |
Family
ID=15710796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61160243A Pending JPS6315731A (en) | 1986-07-08 | 1986-07-08 | Manufacturing device for synthetic resin foamed molded form |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6315731A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006124697A (en) * | 2004-09-30 | 2006-05-18 | Oji Paper Co Ltd | Process for producing foam |
-
1986
- 1986-07-08 JP JP61160243A patent/JPS6315731A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006124697A (en) * | 2004-09-30 | 2006-05-18 | Oji Paper Co Ltd | Process for producing foam |
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