JPH0452110A - Production of two-layer molding made of thermoplastic synthetic resin - Google Patents
Production of two-layer molding made of thermoplastic synthetic resinInfo
- Publication number
- JPH0452110A JPH0452110A JP16204390A JP16204390A JPH0452110A JP H0452110 A JPH0452110 A JP H0452110A JP 16204390 A JP16204390 A JP 16204390A JP 16204390 A JP16204390 A JP 16204390A JP H0452110 A JPH0452110 A JP H0452110A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- layer
- synthetic resin
- thermoplastic synthetic
- particle size
- 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 45
- 239000000057 synthetic resin Substances 0.000 title claims abstract description 45
- 229920001169 thermoplastic Polymers 0.000 title claims abstract description 35
- 239000004416 thermosoftening plastic Substances 0.000 title claims abstract description 35
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 238000000465 moulding Methods 0.000 title abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 35
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 239000002245 particle Substances 0.000 claims description 22
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 abstract description 13
- 239000000203 mixture Substances 0.000 abstract description 8
- 238000006073 displacement reaction Methods 0.000 abstract description 5
- 239000010419 fine particle Substances 0.000 abstract description 4
- 239000011362 coarse particle Substances 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 83
- 229920005989 resin Polymers 0.000 description 12
- 239000011347 resin Substances 0.000 description 12
- 239000011229 interlayer Substances 0.000 description 7
- 239000000155 melt Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 229920001684 low density polyethylene Polymers 0.000 description 5
- 239000004702 low-density polyethylene Substances 0.000 description 5
- 239000004743 Polypropylene Substances 0.000 description 4
- 239000004793 Polystyrene Substances 0.000 description 4
- -1 polypropylene Polymers 0.000 description 4
- 229920001155 polypropylene Polymers 0.000 description 4
- 229920002223 polystyrene Polymers 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000001175 rotational moulding Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000004604 Blowing Agent Substances 0.000 description 1
- 238000004566 IR spectroscopy Methods 0.000 description 1
- 239000004594 Masterbatch (MB) Substances 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 description 1
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 description 1
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 229920000092 linear low density polyethylene Polymers 0.000 description 1
- 239000004707 linear low-density polyethylene Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 229920005990 polystyrene resin Polymers 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C41/04—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould
- B29C41/06—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould about two or more axes
-
- 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
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C41/22—Making multilayered or multicoloured articles
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
Description
【発明の詳細な説明】
Ａ０発明の目的
（１）産業上の利用分野
本発明は、熱可塑性合成樹脂から成る二層成形物の製造
方法に関する。DETAILED DESCRIPTION OF THE INVENTION A0 Object of the Invention (1) Field of Industrial Application The present invention relates to a method for manufacturing a two-layer molded article made of a thermoplastic synthetic resin.
（２）従来の技術
従来、特公昭４２−１１５１０号公報で開示されている
ような回転成形法を用いて熱可塑性合成樹脂から成る二
層成形物を製造することが知られている。(2) Prior Art Conventionally, it has been known to produce a two-layer molded product made of thermoplastic synthetic resin using a rotational molding method as disclosed in Japanese Patent Publication No. 42-11510.
（３）発明が解決しようとする課題
上記回転成形法によると、先ず外層用熱可塑性合成樹脂
粉末を金型内に充填し、該金型を二軸まわりに角変位し
ながら加熱して外層用溶融樹脂層を形成した後、冷却固
化して外層用樹脂層を一旦成形し、次いで内層用熱可塑
性合成樹脂粉末を金型に充填し、再たび加熱溶融、冷却
固化の工程を経て、外層用樹脂層の内側に内層用樹脂層
を成形するようにしている。(3) Problems to be Solved by the Invention According to the above-mentioned rotational molding method, thermoplastic synthetic resin powder for the outer layer is first filled into a mold, and the mold is heated while being angularly displaced around two axes. After forming the molten resin layer, it is cooled and solidified to form the resin layer for the outer layer, then the thermoplastic synthetic resin powder for the inner layer is filled into a mold, and the process of heating, melting, cooling and solidifying is performed again, and then the resin layer for the outer layer is formed. An inner resin layer is molded inside the resin layer.
しかるに上記製造方法では、外層成形工程と、内層成形
工程との二工程が必要であり、製造効率に優れていると
は言い難い。また外層用樹脂層は、−旦成形された後、
内層の成形にあたって再度加熱されることになるので、
使用する合成樹脂の種類によっては熱劣化により強度低
下を招くおそれがある。さらに相溶性の低い合成樹脂や
相互に熱融着し難い合成樹脂により二層成形物を成形し
た場合には、外層および内層の層間接着力が低く、充分
な実用強度が得られないことがある。However, the above manufacturing method requires two steps, an outer layer molding step and an inner layer molding step, and cannot be said to be excellent in manufacturing efficiency. Moreover, after the resin layer for the outer layer is molded,
Since the inner layer will be heated again when forming it,
Depending on the type of synthetic resin used, there is a risk of a decrease in strength due to thermal deterioration. Furthermore, if a two-layer molded product is made of synthetic resins that have low compatibility or are difficult to thermally bond to each other, the interlayer adhesion between the outer layer and inner layer may be low, and sufficient practical strength may not be obtained. .
本発明は、かかる事情に鑑みてなされたものであり、相
溶性の優劣にかかわらず安定した層間接着強度を有する
二層成形物を、−工程で製造し得るようにした、熱可塑
性合成樹脂から成る二層成形物の製造方法を提供するこ
とを目的とする。The present invention has been made in view of the above circumstances, and it is possible to produce a two-layer molded product having stable interlayer adhesive strength regardless of compatibility, from a thermoplastic synthetic resin in a process. The object of the present invention is to provide a method for manufacturing a two-layer molded product.
Ｂ９発明の構成
（１）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第１の特徴によれば
、粒度の粗い内層用熱可塑性合成樹脂粉末と、粒度の細
かい外層用熱可塑性合成樹脂粉末とを混合して金型に充
填し、該金型を二軸まわりに角変位させながら加熱して
前記両粉末を溶融した後、冷却固化する。B9 Structure of the Invention (1) Means for Solving the Problems According to the first feature of the present invention for achieving the above-mentioned object, a thermoplastic synthetic resin powder with a coarse particle size for the inner layer and a thermoplastic synthetic resin powder with a fine particle size for the outer layer. The mixture is mixed with a plastic synthetic resin powder and filled into a mold, and the mold is heated while being angularly displaced around two axes to melt both powders, and then cooled and solidified.
また本発明の第２の特徴によれば、内層用熱可塑性合成
樹脂粉末の粒度は３メツシュ以上３０メツシュ未満であ
り、外層用熱可塑性合成樹脂粉末の粒度は３０メツシュ
以上である。According to the second feature of the present invention, the particle size of the thermoplastic synthetic resin powder for the inner layer is 3 meshes or more and less than 30 meshes, and the particle size of the thermoplastic synthetic resin powder for the outer layer is 30 meshes or more.
上記熱可塑性合成樹脂としては、高密度ポリエチレン、
低密度ポリエチレン、直鎮状低密度ポリエチレン、ポリ
プロピレン、ポリアミド、エチレン−酢ビ共重合体、ポ
リカーボネート、ポリスチレン、アクリロニトリル−ブ
タヂエン−スチレン共重合体、ポリメチルメタアクリレ
ート、塩化ビニル等を用いることができ、これらの熱可
塑性合成樹脂は外層用および内層用のいずれにも用いら
れる。また上記合成樹脂には、着色用の顔料、発泡剤な
どの添加剤を含有するマスターバッチやコンパウンドが
用いられてもよい。The above-mentioned thermoplastic synthetic resins include high-density polyethylene,
Low density polyethylene, linear low density polyethylene, polypropylene, polyamide, ethylene-vinyl acetate copolymer, polycarbonate, polystyrene, acrylonitrile-butadiene-styrene copolymer, polymethyl methacrylate, vinyl chloride, etc. can be used, These thermoplastic synthetic resins are used for both the outer layer and the inner layer. Furthermore, a masterbatch or compound containing additives such as coloring pigments and blowing agents may be used as the synthetic resin.
（２）作用
上記第１の特徴によると、内層用熱可塑性合成樹脂粉末
と、外層用熱可塑性合成樹脂粉末とは、それらの粉末を
混合状態で充填した金型を二軸まわりに角変位しながら
加熱することにより層分離状態となり、粒度の細かい方
が外層を、また粒度の粗い方が内層を形成することにな
る。この層分離現象は、粒度の相違が熱伝導による吸熱
に影響を及ぼし、加熱溶融に時間差が生じることによっ
て生じるものと推測される。すなわち２種類の粒度の異
なる熱可塑性合成樹脂粉末のうち、粒度の細かい方は表
面積が大きいことに起因して熱伝導による吸熱効率がよ
いので優先的に溶融し、時間的に早く金型内面に融着し
て外層用溶融樹脂層を形成し、その後、粒度の粗い方が
外層用樹脂層を介して吸熱溶融し、内層用溶融樹脂層を
形成するものと考えられる。(2) Effect According to the first feature above, the thermoplastic synthetic resin powder for the inner layer and the thermoplastic synthetic resin powder for the outer layer are used by angularly displacing the mold filled with these powders in a mixed state around two axes. By heating the mixture while heating, the layers are separated, and the finer grain size forms the outer layer, and the coarser grain size forms the inner layer. This layer separation phenomenon is presumed to be caused by the difference in particle size affecting heat absorption due to heat conduction, resulting in a time difference in heating and melting. In other words, among two types of thermoplastic synthetic resin powders with different particle sizes, the finer particle size has a larger surface area and has better heat absorption efficiency through heat conduction, so it melts preferentially and reaches the inner surface of the mold faster. It is thought that the particles are fused to form a molten resin layer for the outer layer, and then the coarser particles are endothermically melted through the resin layer for the outer layer to form the molten resin layer for the inner layer.
このようにして得られた二層成形物の外層および内層間
には明確な層界面が認められず、相互に入り組んだ界面
構造を有することになり、相溶性の乏しい合成樹脂の組
合せでも優れた層間接着強度が得られる。There is no clear layer interface between the outer layer and inner layer of the two-layer molded product obtained in this way, and it has an interfacial structure that is intertwined with each other, making it excellent even when combining synthetic resins with poor compatibility. Interlayer adhesion strength can be obtained.
また上記第２の特徴によると、内層用熱可塑性合成樹脂
粉末は、３メツシュ以上で３０メツシュ未満の粒度を有
するものであり、内層用熱可塑性合成樹脂粉末が通常の
回転成形で用いられる３０メツシュ以上である場合には
外層成分との分離が不充分となり、また３メツシユ以下
の場合には溶融に要する時間が長くなる。According to the second feature, the thermoplastic synthetic resin powder for the inner layer has a particle size of 3 mesh or more and less than 30 mesh, and the thermoplastic synthetic resin powder for the inner layer has a particle size of 3 mesh or more and less than 30 mesh, which is used in normal rotational molding. If it is more than 3 meshes, the separation from the outer layer components will be insufficient, and if it is less than 3 meshes, the time required for melting will be longer.
（３）実施例
第１図は本発明方法を実施するにあたって用いる成形装
置の一例の概略を示す切欠き斜視図であり、外層用熱可
塑性合成樹脂粉末と内層用熱可塑性合成樹脂粉末とを混
合状態で充填するための開閉可能な金型１には、同一軸
線上で両端から突出する軸２ａ、２ｂが設けられており
、それらの軸２ａ、２ｂは枠体３により回転可能に支承
される。(3) Example FIG. 1 is a cutaway perspective view schematically showing an example of a molding apparatus used in implementing the method of the present invention, in which thermoplastic synthetic resin powder for the outer layer and thermoplastic synthetic resin powder for the inner layer are mixed. A mold 1 that can be opened and closed for filling in a state is provided with shafts 2a and 2b protruding from both ends on the same axis, and these shafts 2a and 2b are rotatably supported by a frame 3. .
而して枠体３には、前記軸２ａ、２ｂと直交する軸線を
有する軸４ａ、４ｂが設けられており、それらの軸４ａ
、４ｂが揺動可能にして加熱炉５に支承される。すなわ
ち金型１は、軸２ａ、２ｂまわりの角変位と、それらの
軸２ａ、２ｂに直交する軸４ａ、４ｂまわりの角変位と
を可能にして加熱炉５内に配置されることになる。The frame body 3 is provided with shafts 4a and 4b having axes perpendicular to the shafts 2a and 2b.
, 4b are swingably supported by the heating furnace 5. That is, the mold 1 is arranged in the heating furnace 5 in such a way that it can be angularly displaced around the axes 2a, 2b and around the axes 4a, 4b perpendicular to the axes 2a, 2b.
加熱炉５内の下部には金型１を加熱するためのバーナ６
が配設される。また枠体３には、前記軸２ａ、２ｂの一
方２ａに、たとえば歯車列７を介して連結されるモータ
８を固定的に支持するためのブラケット９が固定される
。さらに加熱炉５を配置した床面には、モータ１０が配
設されており、枠体３の軸４ａ、４ｂのうち加熱炉５を
貫通して外方に突出した軸４ａに固定されたピニオンギ
ヤ１１に、モータ１０により上下に駆動されるラック１
２が噛合される。A burner 6 for heating the mold 1 is installed at the lower part of the heating furnace 5.
will be placed. Further, a bracket 9 is fixed to the frame 3 for fixedly supporting a motor 8 which is connected to one of the shafts 2a, 2b via a gear train 7, for example. Further, a motor 10 is disposed on the floor surface on which the heating furnace 5 is arranged, and a pinion gear fixed to a shaft 4a of the shafts 4a and 4b of the frame body 3 that penetrates the heating furnace 5 and protrudes outward. 11, a rack 1 driven vertically by a motor 10;
2 are engaged.
このような成形装置によれば、金型ｌを、軸４ａ、４ｂ
まわりにたとえば４５度の範囲で揺動させながら軸２ａ
、２ｂまわりに回転させつつ、バーナ６で加熱すること
ができる。According to such a molding device, the mold 1 is connected to the shafts 4a and 4b.
For example, while swinging the axis 2a within a range of 45 degrees,
, 2b, and can be heated with the burner 6.
上述のような成形装置を用いて、二層成形物の成形が行
なわれる。すなわち、３メツシュ以上３０メツシュ未満
の粒度の粗い内層用熱可塑性合成樹脂粉末と、３０メツ
シユ以上の粒度の細かい外層用熱可塑性合成樹脂粉末と
を混合状態で金型１に充填し、該金型１をバーナー６に
よって加熱しなから二軸まわりに角変位させて前記両合
成樹脂を溶融することにより、第２図で示すように、金
型１内には、該金型１の内面に溶着する外層Ｍ。A two-layer molded product is molded using the molding apparatus as described above. That is, a mold 1 is filled with a coarse thermoplastic synthetic resin powder for the inner layer having a particle size of 3 meshes or more and less than 30 meshes and a thermoplastic synthetic resin powder for the outer layer having a fine particle size of 30 meshes or more in a mixed state. 1 is heated by a burner 6 and then angularly displaced around two axes to melt both synthetic resins. As shown in FIG. Outer layer M.
と、その外層Ｍ。の内面に溶着する内層Ｍ１とが層間界
面を相互に入り組ませた状態で形成され、それを冷却固
化することにより、二層成形物Ｍが得られる。and its outer layer M. An inner layer M1 welded to the inner surface of the inner layer M1 is formed with interlayer interfaces intertwined with each other, and by cooling and solidifying it, a two-layer molded product M is obtained.
次に二層成形物を実際に成形したときの結果について説
明する。Next, the results obtained when a two-layer molded product was actually molded will be explained.
平均粒度が５０メツシユ、密度が０．９２１、メルトイ
ンデックラスが２．０の低密度ポリエチレン粉末と、平
均粒度が１２メツシユ、密度が１．０５、メルトインデ
ックラスが２．０のポリスチレン粉末とを等量の割合で
均一に混合し、この混合物２．０ｋｇを容量３０１の金
型内に充填し、二軸まわりに金型を角変位させながら６
分間加熱して合成樹脂を溶融し、次いで９分間の空冷お
よび２分間の水冷を順次実施して冷却固化した後、金型
より成形物を取出した。この際、１つの二層成形物を製
造するに要した時間は約２０分であった。A low-density polyethylene powder with an average particle size of 50 mesh, a density of 0.921, and a melt index class of 2.0, and a polystyrene powder with an average particle size of 12 mesh, a density of 1.05, and a melt index class of 2.0. Mix uniformly in equal proportions, fill 2.0 kg of this mixture into a mold with a capacity of 301, and 6.0 kg while angularly displacing the mold around two axes.
The synthetic resin was heated for 1 minute to melt the resin, and then air-cooled for 9 minutes and water-cooled for 2 minutes to cool and solidify, and then the molded product was taken out from the mold. At this time, the time required to produce one two-layer molded product was about 20 minutes.
得られた成形物の断面を顕微鏡で確認したところ、二層
構造となっており、その層間界面は相互に入り組んだ状
態となっていた。また内外各層の構成成分を赤外線吸収
スペクトルにより同定したところ、外層側は低密度ポリ
エチレン樹脂であり、内層側はポリスチレン樹脂である
ことが判明した。When the cross section of the obtained molded product was examined under a microscope, it was found that it had a two-layer structure, and the interface between the layers was in a state of being entangled with each other. Furthermore, when the constituent components of the inner and outer layers were identified by infrared absorption spectroscopy, it was found that the outer layer was a low-density polyethylene resin and the inner layer was a polystyrene resin.
しかもこの二層成形物は充分な層間接着強度を有してい
た。Moreover, this two-layer molded product had sufficient interlayer adhesive strength.
平均粒度が６０メツシユ、密度が０．９０、メルトイン
デックラスが２．０のポリプロピレン粉末と、平均粒度
が２０メツシユ、密度が１．２、熱変形温度が１６０℃
のポリカーボネート粉末とを等量の割合で均一に混合し
、この混合物１．０ ｋｇを容量１０１の金型内に充填
し、二軸まわりに角変位させながら７分間加熱して合成
樹脂を溶融し、次いで１０分間の空冷および２分間の水
冷を順次実施して冷却固化した後、金型より成形物を取
出した。Polypropylene powder with an average particle size of 60 mesh, a density of 0.90, and a melt index class of 2.0, and a polypropylene powder with an average particle size of 20 mesh, a density of 1.2, and a heat distortion temperature of 160°C.
1.0 kg of this mixture was filled into a mold with a capacity of 101 mm, and heated for 7 minutes with angular displacement around two axes to melt the synthetic resin. Then, the molded product was cooled and solidified by sequentially performing air cooling for 10 minutes and water cooling for 2 minutes, and then the molded product was taken out from the mold.
この際、１つの二層成形物を製造するに要した時間は約
２２分であった。At this time, the time required to produce one two-layer molded product was about 22 minutes.
得られた成形物の構造およびその構成を上記実施例Ｉと
同様の方法で確認したところ、外層側がポリプロピレン
樹脂であり、内層側がポリカーボネート樹脂から成る二
層構造の成形物であることが判明した。しかもこの二層
成形物の層界面は相互に入り組んだ状態となっており、
層間接着力は充分であった。When the structure and configuration of the obtained molded product were confirmed in the same manner as in Example I above, it was found that the molded product had a two-layer structure, with the outer layer being made of polypropylene resin and the inner layer being made of polycarbonate resin. Furthermore, the layer interfaces of this two-layer molded product are intertwined with each other.
The interlayer adhesive strength was sufficient.
平均粒度が５０メツシユ、密度が０．９２Ｌメルトイン
デツクツスが２．０の低密度ポリエチレン粉末と、平均
粒度が５０メツシユ、密度が１．０５、メルトインデッ
クスが２．０のポリスチレン粉末とを等量の割合で均一
に混合し、この混合物を用いて、上記実施例Ｉと同様の
成形条件で成形物を得た。而して、得られたｔＬ形物は
二層構造とはならず、両合成樹脂が均一に混ざりあった
単一層が形成されていた。A low-density polyethylene powder with an average particle size of 50 mesh, a density of 0.92L, and a melt index of 2.0, and a polystyrene powder with an average particle size of 50 mesh, a density of 1.05, and a melt index of 2.0, etc. A molded article was obtained using the mixture under the same molding conditions as in Example I above. Thus, the obtained tL-shaped product did not have a two-layer structure, but a single layer in which both synthetic resins were evenly mixed.
上記実施例■で使用した金型および成形装置を用い、外
層用熱可塑性合成樹脂として平均粒度が５０メツシユ、
密度が０．９２１、メルトインデックラスが２．０の低
密度ポリエチレン粉末１．０ｋｇを金型に充填して外層
の成形を行ない、次いで成形装置の作動を一旦停止した
後、平均粒度が５０メツシユ、密度が１．０５、メルト
インデックラスが２．０のポリスチレン粉末Ｌ Ｏｋｇ
を金型に充填して内層の成形を行なって、二層成形物を
得た。この際、１つの二層成形物を製造するに要した時
間は約３５分であり、実施例■の場合に比べて約２倍弱
の時間を要した。Using the mold and molding equipment used in Example 3 above, the thermoplastic synthetic resin for the outer layer had an average particle size of 50 mesh,
1.0 kg of low-density polyethylene powder with a density of 0.921 and a melt index class of 2.0 is filled into a mold to form the outer layer, and then, after the operation of the molding equipment is temporarily stopped, the average particle size is 50 mesh. , polystyrene powder L Okg with density 1.05 and melt index class 2.0
A two-layer molded product was obtained by filling a mold with the mixture and molding the inner layer. At this time, the time required to produce one two-layer molded product was about 35 minutes, which was about twice as long as in Example (2).
また得られた成形物の層間接着強度は非常に弱く、実用
強度が得られなかった。Furthermore, the interlayer adhesion strength of the obtained molded product was so weak that practical strength could not be obtained.
Ｃ０発明の効果
以上のように本発明の第１の特徴によれば、外層用およ
び内層用の熱可塑性合成樹脂の粒度を異ならせることに
より、従来の成形装置を用いて効率的に二層成形物を得
ることが可能となる。しかも相溶性の優劣にかかわらず
層間強度の強い二層成形物を得ることが可能であり、多
種の熱可塑性合成樹脂の組合せが可能であり、極めて実
用性の高い製造方法である。Effects of the C0 Invention As described above, according to the first feature of the present invention, by making the particle sizes of the thermoplastic synthetic resins for the outer layer and the inner layer different, two-layer molding can be performed efficiently using conventional molding equipment. It becomes possible to obtain things. Moreover, it is possible to obtain a two-layer molded product with strong interlaminar strength regardless of compatibility, and it is possible to combine various types of thermoplastic synthetic resins, making it an extremely practical manufacturing method.
また本発明の第２の特徴によれば、第１の特徴の効果に
加えて、使用する熱可塑性合成樹脂の粒度を特定するの
みで、確実に二層に分離した二層成形物を短時間に製造
することができる。According to the second feature of the present invention, in addition to the effect of the first feature, by simply specifying the particle size of the thermoplastic synthetic resin used, it is possible to reliably produce a two-layer molded product separated into two layers in a short time. can be manufactured.
第１図は本発明方法を実施する成形装置の一例の切欠き
斜視図、第２図は第１図のＩＩ−ＩＩ線に沿う金型の断
面図である。
１・・・金型、Ｍ・・・二層成形物FIG. 1 is a cutaway perspective view of an example of a molding apparatus for carrying out the method of the present invention, and FIG. 2 is a sectional view of a mold taken along line II--II in FIG. 1. 1...Mold, M...Two-layer molded product
Claims (2)
の細かい外層用熱可塑性合成樹脂粉末とを混合して金型
に充填し、該金型を二軸まわりに角変位させながら加熱
して前記両粉末を溶融した後、冷却固化することを特徴
とする熱可塑性合成樹脂から成る二層成形物の製造方法
。(1) A coarse-grained thermoplastic synthetic resin powder for the inner layer and a fine-grained thermoplastic synthetic resin powder for the outer layer are mixed and filled into a mold, and heated while angularly displacing the mold around two axes. A method for producing a two-layer molded article made of a thermoplastic synthetic resin, which comprises melting the two powders and then cooling and solidifying them.
以上３０メッシュ未満であり、外層用熱可塑性合成樹脂
粉末の粒度は３０メッシュ以上であることを特徴とする
請求項第（１）項記載の熱可塑性合成樹脂から成る二層
成形物の製造方法。(2) The particle size of the thermoplastic synthetic resin powder for the inner layer is 3 mesh or more and less than 30 mesh, and the particle size of the thermoplastic synthetic resin powder for the outer layer is 30 mesh or more. A method for producing a two-layer molded product made of a thermoplastic synthetic resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16204390A JPH0452110A (en) | 1990-06-20 | 1990-06-20 | Production of two-layer molding made of thermoplastic synthetic resin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16204390A JPH0452110A (en) | 1990-06-20 | 1990-06-20 | Production of two-layer molding made of thermoplastic synthetic resin |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0452110A true JPH0452110A (en) | 1992-02-20 |
Family
ID=15747006
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16204390A Pending JPH0452110A (en) | 1990-06-20 | 1990-06-20 | Production of two-layer molding made of thermoplastic synthetic resin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0452110A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2384458A (en) * | 2001-11-24 | 2003-07-30 | Ellis Gordon & Co | Rotomoulded articles and a method of producing the same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4846658A (en) * | 1971-10-14 | 1973-07-03 |
-
1990
- 1990-06-20 JP JP16204390A patent/JPH0452110A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4846658A (en) * | 1971-10-14 | 1973-07-03 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2384458A (en) * | 2001-11-24 | 2003-07-30 | Ellis Gordon & Co | Rotomoulded articles and a method of producing the same |
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