JPS6234533B2 - - Google Patents
Info
- Publication number
- JPS6234533B2 JPS6234533B2 JP54064771A JP6477179A JPS6234533B2 JP S6234533 B2 JPS6234533 B2 JP S6234533B2 JP 54064771 A JP54064771 A JP 54064771A JP 6477179 A JP6477179 A JP 6477179A JP S6234533 B2 JPS6234533 B2 JP S6234533B2
- Authority
- JP
- Japan
- Prior art keywords
- molded product
- blow
- mold
- parison
- skin
- 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.)
- Expired
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
- B29C33/10—Moulds or cores; Details thereof or accessories therefor with incorporated venting means
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/0005—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor characterised by the material
-
- 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
- B29C2791/00—Shaping characteristics in general
- B29C2791/004—Shaping under special conditions
- B29C2791/006—Using vacuum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
- B29K2105/043—Skinned foam
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Molding Of Porous Articles (AREA)
Description
【発明の詳細な説明】
この発明は皮付の発泡ブロー成形品およびその
製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a foam blow-molded product with a skin and a method for manufacturing the same.
従来における発泡ブロー成形品の成形について
は、ブロー成形用押出機等から押出されたパリソ
ンを成形型に入れて、成形品内より２〜５Kg／cm2
の圧力をかけて成形していたものである。このよ
うな方法によると、発泡剤を入れて発泡状態で押
出されたパリソンがブローする時の吹込圧力にて
発泡倍率が下がり、しかも強度も低下する欠点が
あつた。 In the conventional molding of foam blow molded products, the parison extruded from a blow molding extruder, etc. is put into a mold, and 2 to 5 kg/cm 2 is added from the inside of the molded product.
It was molded under a lot of pressure. According to this method, the parison extruded in a foamed state with a foaming agent added thereto has the disadvantage that the blowing pressure at the time of blowing lowers the expansion ratio and also lowers the strength.
そこで、この発明にあつては、上記従来の発泡
ブロー成形品の欠点を解消できるような成形品を
提供しようとしており、その成形品としては、ブ
ロー成形用押出機等にて押出された、発泡剤を含
有せる合成樹脂よりなるパリソンから成形された
発泡ブロー成形品であつて、表面に皮を形成して
なることを特徴としている。 Therefore, the present invention aims to provide a molded product that can overcome the drawbacks of the conventional foam blow-molded products, and the molded product is a foamed product extruded using a blow molding extruder or the like. It is a foaming blow-molded product formed from a parison made of synthetic resin containing an agent, and is characterized by having a skin formed on the surface.
そして上記の発泡ブロー成形品を提供するため
にこの発明の製造方法では、発泡状態で押出され
たパリソンがブロー時の圧力によつて発泡倍率が
下がることなく強度低下をも来たさずに成形しよ
うとしている。即ち、その方法としては発泡剤を
含有せる合成樹脂をブロー成形用押出機等から押
出したパリソンを、冷却されているブロー成形型
に入れて型締めをなし、パリソン内にエアーを吹
込んで中空に形成し、成形品表面が硬化した後、
成形品内面より真空をかけて成形品内面を減圧に
することにより、表面に皮を形成した発泡ブロー
成形品を得ることを特徴としている。 In order to provide the above-mentioned foam blow-molded product, the manufacturing method of the present invention allows the extruded parison in a foamed state to be molded without decreasing the foaming ratio or decreasing the strength due to the pressure during blowing. Trying to. That is, the method involves extruding a synthetic resin containing a foaming agent from a blow molding extruder, etc., placing the parison in a cooled blow mold, closing the mold, and blowing air into the parison to make it hollow. After forming and hardening the molded product surface,
The method is characterized in that a foam blow-molded product with a skin formed on the surface is obtained by applying a vacuum to the inner surface of the molded product to reduce the pressure.
さらに、上記の方法において、パリソン内にエ
アーを吹込む代りにパリソンに対し型内面から真
空をかけて型内面へパリソンを吸引して中空にし
ても同様の発泡ブロー成形品を提供できる。 Furthermore, in the above method, instead of blowing air into the parison, a vacuum is applied to the parison from the inner surface of the mold to suck the parison into the inner surface of the mold to make it hollow, thereby providing a similar foam blow-molded product.
次いで、この発明の実施態様について図を参照
しながら以下に例示する。 Next, embodiments of the present invention will be illustrated below with reference to the drawings.
発泡剤を3.5％含有せるポリスチレン樹脂をブ
ロー成形用押出機１によつて押出して、押出機先
端のダイス２〔20mmφ、３mmｔ〕から押出したパ
リソンｐをブロー成形型３〔Ｈ＝250mm、120mm
φ〕に入れて型締めを行なう。次に電磁弁４を通
り、型内のパリソンｐ内に突出するノズル４０か
らエアーを吹込み（６Kg／cm2圧力でブロー時間
1.0秒）、パリソンｐをブロー成形型３に沿わせて
中空に形成させる。この時、ブロー成形型３は冷
却されているので中空にされたブロー成形品５の
表面は硬化されるものである。表面硬化後は発泡
樹脂が冷えきらない状態のうちに成形品内面から
真空をかけるもので、具体的にはパリソンが中空
に形成されて約2.5秒の経過後、電磁弁６により
真空ポンプに連結せる管６０を通つてブロー成形
品５内を減圧（100mmHg）にすることによつて成
形品内面を発泡させる。このようにして表面に平
滑な皮５０を形成した発泡ブロー成形品を得るこ
とができた。この場合の成形品は表面の皮５０が
厚み0.4mmで発泡倍率約２倍、残りが厚み2.5mmで
発泡倍率約８倍のものが得られた。 A polystyrene resin containing 3.5% of a blowing agent was extruded using an extruder 1 for blow molding, and the parison P extruded from a die 2 [20 mmφ, 3 mm t] at the tip of the extruder was put into a blow mold 3 [H = 250 mm, 120 mm].
φ] and clamp the mold. Next, air is blown through the solenoid valve 4 and from the nozzle 40 protruding into the parison p in the mold (6 kg/cm 2 pressure and blowing time
1.0 seconds), the parison P is formed into a hollow shape along the blow mold 3. At this time, since the blow molding die 3 is cooled, the surface of the hollow blow molded product 5 is hardened. After the surface hardens, a vacuum is applied from the inside of the molded product before the foamed resin has completely cooled down. Specifically, after about 2.5 seconds have passed since the parison is formed into a hollow, it is connected to a vacuum pump using the solenoid valve 6. The inner surface of the molded product is foamed by reducing the pressure (100 mmHg) in the blow molded product 5 through the pipe 60. In this way, a foam blow-molded product with a smooth skin 50 formed on the surface could be obtained. In this case, the molded product had a surface skin 50 with a thickness of 0.4 mm and a foaming ratio of approximately 2 times, and the remaining skin 50 with a thickness of 2.5 mm and a foaming ratio of approximately 8 times.
また、上記に例示した装置を使用し、パリソン
ｐをブロー成形型３内に入れ、型締めを行なう。
そして電磁弁７によつてブロー成形型３の内面に
開孔せる孔７０から600〜650mmHgで0.5秒吸引を
行ないパリソンｐをブロー成形型３の内面に沿わ
せて中空にする。この時電磁弁８は開放状態にし
てある。そして冷却されているブロー成形型３と
接して成形品の表面は硬化される。硬化後は発泡
樹脂が冷えきらない間にブロー成形品５にその内
面より真空をかけるもので、具体的には電磁弁８
を閉じて電磁弁６により真空ポンプと連絡して真
空をかけブロー成形品５内を減圧（300mmHg）に
することによつて、成形品内面を発泡させる。こ
のようにして表面に平滑な皮５０を形成した発泡
ブロー成形品を得ることができた。この場合の成
形品は表面の皮５０が厚み0.3mmで発泡倍率約3.5
倍、残りが厚み2.7mmで発泡倍率約11倍のものが
得られた。 Further, using the apparatus exemplified above, the parison p is put into the blow mold 3 and the mold is clamped.
Then, suction is applied for 0.5 seconds at 600 to 650 mmHg from a hole 70 made in the inner surface of the blow mold 3 by the electromagnetic valve 7 to make the parison p hollow along the inner surface of the blow mold 3. At this time, the solenoid valve 8 is kept open. Then, the surface of the molded product is hardened by contacting the cooled blow molding die 3. After curing, a vacuum is applied to the blow molded product 5 from its inner surface while the foamed resin has not completely cooled down. Specifically, the solenoid valve 8
is closed and the solenoid valve 6 is connected to a vacuum pump to apply a vacuum to reduce the pressure (300 mmHg) inside the blow molded product 5, thereby foaming the inner surface of the molded product. In this way, a foam blow-molded product with a smooth skin 50 formed on the surface could be obtained. In this case, the molded product has a surface skin 50 with a thickness of 0.3 mm and an expansion ratio of approximately 3.5.
A foam with a thickness of 2.7 mm and a foaming ratio of approximately 11 times was obtained.
なお、図中の９は冷却管、１０は工程を制御す
る制御盤を示している。 In addition, 9 in the figure indicates a cooling pipe, and 10 indicates a control panel for controlling the process.
上記の実施例では発泡性熱可塑性樹脂としてポ
リスチレンの樹脂を用いたが、ポリスチレンのほ
か、ポリメチルメタクリレート、ポリエチレンま
たは他の発泡ブロー成形可能な発泡性熱可塑性樹
脂を使用でき、発泡剤としては、プロパン、ブタ
ン、ペンタン、ヘキサンその他発泡成形用として
公知のものを使用できる。 In the above examples, polystyrene resin was used as the foamable thermoplastic resin, but in addition to polystyrene, polymethyl methacrylate, polyethylene, or other foamable thermoplastic resins that can be foamed and blow molded can be used. Propane, butane, pentane, hexane and other known materials for foam molding can be used.
上記のごとく、この発明方法によると、成形型
に入れたパリソン内にエアーを吹込んで中空にす
る方法および成形型に入れたパリソンを型内面か
ら真空吸引して型に沿わせ中空に形成する方法の
何れにおいても成形品の表面硬化後の成形品の内
面より真空をかけ、成形品内面を減圧にすること
により、表面硬化後の内面を発泡させることがで
きる。このようにして発泡ブロー成形品の表面に
皮を形成でき、しかも全体については、通常の発
泡ブロー成形のごとき欠点を解消できる。即ちブ
ロー圧にて発泡が抑えられ発泡倍率が低下し且つ
強度も低下すると言つた欠点を克服して、発泡ブ
ロー成形品の強度を上げ且つ発泡倍率を上げるこ
とができた。 As described above, according to the method of the present invention, there is a method in which air is blown into the parison placed in a mold to make it hollow, and a method in which the parison placed in the mold is vacuum-suctioned from the inner surface of the mold to form it hollow along the mold. In either case, the inner surface of the molded article after surface hardening can be foamed by applying a vacuum to the inner surface of the molded article and reducing the pressure on the inner surface of the molded article. In this way, a skin can be formed on the surface of the foam blow-molded product, and the drawbacks of ordinary foam blow molding can be overcome as a whole. That is, it was possible to overcome the disadvantages of suppressing foaming by blowing pressure, lowering the foaming ratio and lowering the strength, thereby increasing the strength and foaming ratio of the foam blow-molded product.
以上の発明方法にて提供された発泡ブロー成形
品は表面に皮を形成していて且つ全体の発泡倍率
を上げたものゆえ、表面は硬くて平滑美麗であ
り、しかも全体は中空の軽量なものに拘らず外圧
に対しても強くなるので、断熱性および緩衝性の
優れた容器、各種商品用の緩衝包装体等として好
適なものが提供できる。 The foam blow-molded product provided by the above invention method has a skin formed on the surface and the overall foaming ratio has been increased, so the surface is hard, smooth and beautiful, and the whole is hollow and lightweight. Regardless, it is resistant to external pressure, so it can provide containers with excellent heat insulation and shock-absorbing properties, and suitable shock-absorbing packaging bodies for various products.
図はこの発明の実施態様を例示するものであ
り、第１図は製造時の概要図、第２図は製造され
た発泡ブロー成形品の一部拡大断面図である。
１……押出機、２……ダイス、３……ブロー成
形型、４……電磁弁、４０……ノズル、５……ブ
ロー成形品、５０……表面の皮、６，７……電磁
弁、７０……吸引用の孔、８……電磁弁、ｐ……
パリソン。
The drawings illustrate an embodiment of the present invention, and FIG. 1 is a schematic view during manufacturing, and FIG. 2 is a partially enlarged sectional view of the manufactured foam blow-molded product. 1... Extruder, 2... Die, 3... Blow mold, 4... Solenoid valve, 40... Nozzle, 5... Blow molded product, 50... Surface skin, 6, 7... Solenoid valve , 70... Suction hole, 8... Solenoid valve, p...
Parison.
Claims (1)
剤を含有せる合成樹脂よりなるパリソンから成形
された発泡ブロー成形品であつて、表面に皮を形
成してなることを特徴とする皮付の発泡ブロー成
形品。 ２ 発泡剤を含有せる合成樹脂をブロー成形用押
出機等から押出したパリソンを、冷却されている
ブロー成形型に入れて型締めをなし、パリソン内
にエアーを吹込んで中空に形成し、成形品表面が
硬化した後、成形品内面より真空をかけて成形品
内面を減圧にすることにより、表面に皮を形成し
た発泡ブロー成形品を得ることを特徴とする皮付
の発泡ブロー成形品の製造方法。 ３ 発泡剤を含有せる合成樹脂をブロー成形用押
出機等から押出したパリソンを、冷却されている
ブロー成形型に入れて型締めをなし、型内面より
真空をかけてパリソンを型内面へ吸引することに
より中空に形成し、成形品の表面が硬化した後、
成形品内面より真空をかけて成形品内面を減圧に
することにより、表面に皮を形成した発泡ブロー
成形品を得ることを特徴とする皮付の発泡ブロー
成形品の製造方法。[Scope of Claims] 1. A foam blow-molded product formed from a parison made of a synthetic resin containing a foaming agent and extruded using an extruder for blow molding, etc., with a skin formed on the surface. A foam blow-molded product with a skin. 2. A parison extruded from a blow molding extruder or the like with a synthetic resin containing a foaming agent is placed in a cooled blow mold and the mold is closed. Air is blown into the parison to form it into a hollow shape to form a molded product. After the surface has hardened, a vacuum is applied to the inner surface of the molded product to reduce the pressure, thereby producing a foam blow-molded product with a skin formed on the surface. Method. 3 A parison extruded from a blow molding extruder containing a synthetic resin containing a foaming agent is placed in a cooled blow molding mold, the mold is closed, and a vacuum is applied from the inside of the mold to suck the parison into the mold. After the surface of the molded product has hardened,
A method for producing a foam blow-molded product with a skin, characterized in that a foam blow-molded product with a skin formed on the surface is obtained by applying a vacuum to the inner surface of the molded product to reduce pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6477179A JPS55156033A (en) | 1979-05-24 | 1979-05-24 | Skin attached foamed blow molded article method of fabricating the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6477179A JPS55156033A (en) | 1979-05-24 | 1979-05-24 | Skin attached foamed blow molded article method of fabricating the same |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63124542A Division JPS641518A (en) | 1988-05-20 | 1988-05-20 | Foamed blow molded form with skin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55156033A JPS55156033A (en) | 1980-12-04 |
| JPS6234533B2 true JPS6234533B2 (en) | 1987-07-28 |
Family
ID=13267789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6477179A Granted JPS55156033A (en) | 1979-05-24 | 1979-05-24 | Skin attached foamed blow molded article method of fabricating the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55156033A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62204924A (en) * | 1986-03-05 | 1987-09-09 | Toyo Seikan Kaisha Ltd | Preparation of blow molding container |
| JP2699137B2 (en) * | 1993-03-16 | 1998-01-19 | みのる化成株式会社 | Soundproofing member made of blow-molded foam and method of manufacturing the same |
| BR9806164A (en) * | 1997-09-10 | 1999-10-19 | Wella Ag | Process for the manufacture of hollow bodies of foamed plastic material |
| JP2001009898A (en) | 1999-06-28 | 2001-01-16 | Idemitsu Petrochem Co Ltd | Blow molding method and blow molded product |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5032261A (en) * | 1973-07-20 | 1975-03-28 |
-
1979
- 1979-05-24 JP JP6477179A patent/JPS55156033A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55156033A (en) | 1980-12-04 |
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