JPH0129692B2 - - Google Patents
Info
- Publication number
- JPH0129692B2 JPH0129692B2 JP63124542A JP12454288A JPH0129692B2 JP H0129692 B2 JPH0129692 B2 JP H0129692B2 JP 63124542 A JP63124542 A JP 63124542A JP 12454288 A JP12454288 A JP 12454288A JP H0129692 B2 JPH0129692 B2 JP H0129692B2
- Authority
- JP
- Japan
- Prior art keywords
- molded product
- blow
- foam
- skin
- parison
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/04—Extrusion blow-moulding
-
- 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
- B29K2025/00—Use of polymers of vinyl-aromatic compounds or derivatives thereof as moulding material
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (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】
＜産業上の利用分野＞
この発明は皮付の発泡ブロー成形品に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION <Industrial Field of Application> The present invention relates to a foam blow-molded product with a skin.
＜従来技術及び発明が解決しようとする課題＞
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。<Prior art and problems to be solved by the invention> In the conventional molding of foam blow-molded products, a parison extruded from a blow-molding extruder or the like is put into a mold, and a pressure of 2 to 5 kg/cm is applied from the inside of the molded product. 2
It was molded under a lot of pressure.
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り、所定の発泡倍率が得ら
れず、しかも発泡粒子同士間の融着が不完全とな
り強度も低下するという欠点があつた。 According to this method, the foaming ratio decreases due to the blowing pressure when the parison is extruded in a foamed state with a foaming agent added thereto, making it impossible to obtain the desired foaming ratio, and furthermore, the foam particles may fuse together. The disadvantage was that the surface was incomplete and the strength was reduced.
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、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で
あるにも拘らず外圧に対して強い成形品を提供し
ようとするものである。 Therefore, in the case of this invention, the above-mentioned disadvantages of the conventional foam blow molded products can be solved, and the surface is hard, smooth and beautiful, and although the whole is hollow and lightweight, it is strong against external pressure. The aim is to provide molded products.
＜課題を解決するための手段＞
上記目的を達成するための本発明の構成は、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、表面に成形品とは同
素材で発泡倍率を異にする皮を形成してなる成形
品に存する。<Means for Solving the Problems> The structure of the present invention for achieving the above object is a foamed blow molded from a parison made of a synthetic resin containing a foaming agent and extruded by an extruder for blow molding or the like. It is a molded product that has a skin formed on the surface of the same material as the molded product but with different expansion ratios.
＜作用＞
以上のような構成からなるこの発明の発泡ブロ
ー成形品は、表面に成形品とは同素材で発泡倍率
を異にする皮を形成していて且つ全体の発泡倍率
を上げ発泡粒子間の充分な発泡融着が行なわれる
ようにしたものゆえ、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であるにも拘
らず外圧に対しても強いものとなり、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
等として使用できるものとなる。<Function> The foam blow-molded product of the present invention having the above-mentioned configuration has a skin on the surface that is made of the same material as the molded product and has a different expansion ratio. The surface is hard, smooth and beautiful, and although the whole is hollow and lightweight, it is strong against external pressure, and has excellent heat insulation and It can be used as a container with excellent cushioning properties, a cushioning package for various products, etc.
＜実施例＞
次いで、この発明の実施例について図を参照し
ながら以下に例示する。<Example> Next, examples of the present invention will be illustrated below with reference to the drawings.
図中、５は発泡ポリスチレン樹脂からなる発泡
ブロー成形品であつて、表面に成形品とは同素材
で発泡倍率を異にする平滑な皮５０が形成されて
いる。 In the figure, reference numeral 5 denotes a foam blow-molded product made of foamed polystyrene resin, and a smooth skin 50 made of the same material as the molded product but with a different expansion ratio is formed on the surface.
そして、この発泡ブロー成形品５の製造につい
て具体的に説明すると、先ず発泡剤を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［20mm
φ、３mmｔ］から押出したパリソンｐをブロー成
形型３［Ｈ＝250mm、120mmφ］に入れて型締めを
行なう。 To specifically explain the production of this foam blow-molded product 5, first, polystyrene resin containing 3.5% of a foaming agent is extruded using an extruder 1 for blow molding, and a die 2 [20 mm
The parison P extruded from the blow molding die 3 [H=250 mm, 120 mmφ] is then clamped.
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
ブロー成形型５の表面は硬化されるものである。 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
Using 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 mold 3 is cooled, the surface of the hollow blow molding mold 5 is hardened.
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。具体的にはパ
リソンｐ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した管６０を通
つてブロー成形品内を減圧（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５を得ることができた。 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 p is formed into a hollow,
By reducing the pressure (100 mmHg) inside the blow molded product through a pipe 60 connected to a vacuum pump using a solenoid valve 6, the inner surface of the molded product is foamed. In this way, a foam blow-molded product 5 with a smooth skin 50 formed on the surface was obtained.
この場合の成形品は表面の平滑な皮５０が厚み
0.4mmで発泡倍率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。 In this case, the thickness of the molded product is the smooth skin 50 on the surface.
When the thickness was 0.4 mm, the foaming ratio was 2 times, and when the remaining thickness was 2.5 mm, the foaming ratio was approximately 8 times.
また、上記に例示した装置を使用した別の発泡
ブロー成形品５の製造について説明すると、上記
と同様のパリソン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600〜650mm
Hg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は開放状態にしておく。 Also, to explain the production of another foam blow-molded product 5 using the apparatus exemplified above, a parison p similar to the above is placed in a blow-molding mold 3,
Perform mold clamping. and 600 to 650 mm from the hole 70 made in the inner surface of the blow molding mold 3 by the solenoid valve 7.
Apply Hg suction for 0.5 seconds 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.
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。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結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、成形品内面側を発泡させる。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。 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.
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。 In this case, the surface skin 50 of the molded product has a thickness of 0.3 mm.
The foaming ratio was approximately 3.5 times, and the remaining foam had a thickness of 2.7 mm and a foaming ratio of approximately 11 times.
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、ベンタン、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, bentane, hexane and other known materials for foam molding can be used.
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
ロー成形品のごとき欠点を解消できる。即ちブロ
ー圧にて成形品の発泡が押えられて発泡倍率が低
下し所望の発泡倍率が得られず且つ発泡粒子同士
間の融着が不完全で強度も低下すると言つた欠点
を克服でき、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。 In this way, a skin can be formed on the surface of the foam blow-molded product, and the drawbacks of ordinary foam blow-molded products can be overcome as a whole. In other words, it is possible to overcome the disadvantages that the blowing pressure suppresses the foaming of the molded product and reduces the foaming ratio, making it impossible to obtain the desired foaming ratio, and also that the fusion between the foamed particles is incomplete and the strength is reduced. It was possible to increase the strength and expansion ratio of the blow-molded product.
＜発明の効果＞
以上の如くこの発明の発泡ブロー成形品は、表
面に成形品とは同素材で、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。<Effects of the Invention> As described above, the foam blow-molded product of the present invention has a hard, smooth and beautiful surface because it has a skin formed on the surface using the same material as the molded product and the overall foaming ratio has been increased. Moreover, even though the entire structure is hollow and lightweight, 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.
第１図は発泡ブロー成形品の製造時の概要図、
第２図は製造された発泡ブロー成形品の一部拡大
断面図を示している。
１……押出機、２……ダイズ、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。
Figure 1 is a schematic diagram of the manufacturing process of foam blow molded products.
FIG. 2 shows a partially enlarged sectional view of the produced foam blow-molded product. 1... Extruder, 2... Soybeans, 3... Blow molding 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、表面に成形品
とは同素材で発泡倍率を異にする皮を形成してな
ることを特徴とする皮付の発泡ブロー成形品。1 A foam blow-molded product made from a parison made of a synthetic resin containing a foaming agent and extruded using an extruder for blow molding, etc., with a surface made of the same material as the molded product but with a different expansion ratio. A foam blow-molded product with a skin, which is characterized by forming a skin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63-124542A JPH011518A (en) | 1988-05-20 | Foam blow molded product with skin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63-124542A JPH011518A (en) | 1988-05-20 | Foam blow molded product with skin |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6477179A Division JPS55156033A (en) | 1979-05-24 | 1979-05-24 | Skin attached foamed blow molded article method of fabricating the same |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JPS641518A JPS641518A (en) | 1989-01-05 |
| JPH011518A JPH011518A (en) | 1989-01-05 |
| JPH0129692B2 true JPH0129692B2 (en) | 1989-06-13 |
Family
ID=
Also Published As
| Publication number | Publication date |
|---|---|
| JPS641518A (en) | 1989-01-05 |
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