JPH0813479B2 - Method for producing thermoplastic resin foam molding - Google Patents
Method for producing thermoplastic resin foam moldingInfo
- Publication number
- JPH0813479B2 JPH0813479B2 JP62286776A JP28677687A JPH0813479B2 JP H0813479 B2 JPH0813479 B2 JP H0813479B2 JP 62286776 A JP62286776 A JP 62286776A JP 28677687 A JP28677687 A JP 28677687A JP H0813479 B2 JPH0813479 B2 JP H0813479B2
- Authority
- JP
- Japan
- Prior art keywords
- cavity
- filling
- resin particles
- thermoplastic resin
- expanded
- 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 - Fee Related
Links
- 229920005992 thermoplastic resin Polymers 0.000 title claims description 17
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 238000010097 foam moulding Methods 0.000 title description 2
- 239000002245 particle Substances 0.000 claims description 53
- 229920005989 resin Polymers 0.000 claims description 42
- 239000011347 resin Substances 0.000 claims description 42
- 230000006837 decompression Effects 0.000 claims description 19
- 238000000465 moulding Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 7
- 239000006260 foam Substances 0.000 claims description 4
- 239000002994 raw material Substances 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 4
- -1 polypropylene Polymers 0.000 description 4
- 239000004793 Polystyrene Substances 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- 229920002223 polystyrene Polymers 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 230000036962 time dependent Effects 0.000 description 2
- 229920002126 Acrylic acid copolymer Polymers 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- XYLMUPLGERFSHI-UHFFFAOYSA-N alpha-Methylstyrene Chemical class CC(=C)C1=CC=CC=C1 XYLMUPLGERFSHI-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001195 polyisoprene Polymers 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
Landscapes
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は金型のキャビティー内に予備発泡樹脂粒子を
一定した量で短時間に充填する熱可塑性樹脂発泡成形物
の製造方法に関するものである。TECHNICAL FIELD The present invention relates to a method for producing a thermoplastic resin foamed molded product in which a cavity of a mold is filled with a constant amount of pre-expanded resin particles in a short time. is there.
［従来の技術］ 従来、熱可塑性樹脂発泡成形物の製造方法において、
予備発泡樹脂粒子を金型のキャビティー内に充填する方
法としては、一般に圧縮空気を噴出させた時に生ずる吸
引力によって予備発泡樹脂粒子を吸引してキャビティー
内に充填していた。[Prior Art] Conventionally, in a method for producing a thermoplastic resin foam molded article,
As a method of filling the pre-expanded resin particles in the cavity of the mold, generally, the pre-expanded resin particles are sucked by the suction force generated when the compressed air is jetted to fill the cavity.
このような圧縮空気によってキャビティー内に予備発
泡樹脂粒子を充填する方法は、圧縮空気の元圧の変動に
よって充填時間が変動するため、通常は、この時の圧縮
空気の噴出時間の設定を、実際に必要とされる充填時間
に安全係数を乗じた時間だけ余分に設定して予備発泡樹
脂粒子を充填させている。In the method of filling the pre-foamed resin particles in the cavity with such compressed air, the filling time varies depending on the change in the original pressure of the compressed air, so normally, the setting of the jetting time of the compressed air at this time is The pre-expanded resin particles are filled for an extra time by multiplying the actually required filling time by a safety factor.
［発明が解決しようとする問題点］ しかし、元圧の圧縮空気の変動が大きすぎる場合と
か、あるいは、何らかの理由で原料ホッパーよりキャビ
ティー内に予備発泡樹脂粒子が供給されない場合などで
も、前記圧縮空気の噴出時間が予め設定された時間を経
過すると自動的に圧縮空気の噴出が停止されるので、未
だキャビティー内に予備発泡樹脂粒子が十分に充填され
ていないことがあり、そのままの状態で加熱され発泡成
形されると不良品を作ることになる。一方、前記安全係
数が大きいと充填時間が長くなり、成形加工時間が延び
る。また、圧縮空気の消費量が増し、ロスとなる。更に
金型温度低下により品質が悪化するという問題がある。[Problems to be Solved by the Invention] However, even when the fluctuation of the compressed air of the original pressure is too large, or when the pre-expanded resin particles are not supplied from the raw material hopper into the cavity for some reason, the above-mentioned compression When the air ejection time exceeds the preset time, the ejection of compressed air is automatically stopped.Therefore, the pre-expanded resin particles may not be sufficiently filled in the cavity. If it is heated and foam-molded, a defective product will be produced. On the other hand, when the safety factor is large, the filling time becomes long and the molding processing time becomes long. In addition, the consumption of compressed air increases, resulting in a loss. Further, there is a problem that the quality is deteriorated due to the mold temperature lowering.
［問題点を解決するための手段］ 本発明は上記の問題点に鑑みてなされたものであっ
て、予備発泡樹脂粒子の充填に際してスチームチャンバ
ー側より吸引し、充填量によって変化する吸引側の減圧
度を検出することにより充填量を規制し得ることを見出
し、問題点を解決したものである。[Means for Solving the Problems] The present invention has been made in view of the above problems, and when the pre-expanded resin particles are filled, suction is performed from the steam chamber side, and pressure reduction on the suction side that changes depending on the filling amount. The inventors have found that the filling amount can be regulated by detecting the degree, and have solved the problem.
すなわち本発明は、スチームチャンバー及びスチーム
孔を備えた雌雄二つの金型を閉型することによって形成
されるキャビティー内に、減圧装置を駆動させてキャビ
ティー内の空気を排出し、その吸引力により予備発泡樹
脂粒子を充填した後、金型を加熱して、熱可塑性樹脂発
泡成形物を製造する方法において、減圧装置を駆動させ
て、キャビティー内の空気を排出しキャビティー内を減
圧にした後、充填ガンを作動させて、予備発泡樹脂粒子
をキャビティー内に導き、該キャビティー内に予備発泡
樹脂粒子が充填されることによって生じる減圧度を検出
し、該減圧度が所定の減圧度に達した時に前記充填ガン
の作動を停止させて予備発泡樹脂粒子の充填を停止する
ことを特徴とする熱可塑性樹脂発泡成形物の製造方法で
ある。That is, according to the present invention, a decompression device is driven into a cavity formed by closing two molds having a steam chamber and a steam hole, and air in the cavity is discharged, and its suction force is increased. After filling the pre-expanded resin particles by the method, in the method of manufacturing the thermoplastic resin foam molding by heating the mold, the decompression device is driven to discharge the air in the cavity to reduce the pressure in the cavity. After that, the filling gun is operated to guide the pre-expanded resin particles into the cavity, and the degree of decompression caused by filling the pre-expanded resin particles in the cavity is detected. When the temperature reaches a certain level, the operation of the filling gun is stopped to stop the filling of the pre-expanded resin particles.
［発明の具体的説明］ 本発明の熱可塑性樹脂発泡成形物の製造方法につい
て、さらに詳細に説明するために、以下に本発明の一実
施例を図面を挙げて具体的に説明する。[Detailed Description of the Invention] In order to describe the method for producing a thermoplastic resin foam-molded product of the present invention in more detail, one embodiment of the present invention will be specifically described below with reference to the drawings.
第１図は本発明実施例の熱可塑性樹脂発泡成形物の製
造方法に用いられる成形用金型の断面図とその制御ライ
ンの概略図であり、第２図は予備発泡樹脂粒子の充填時
におけるスチームチャンバー内の減圧度の経時変化を表
わす図である。FIG. 1 is a cross-sectional view of a molding die used in a method for producing a thermoplastic resin foam-molded article according to an embodiment of the present invention and a schematic view of its control line, and FIG. It is a figure showing the time-dependent change of the pressure reduction degree in a steam chamber.
第１図において、１は本発明の熱可塑性樹脂発泡成形
物の製造方法において用いられる成形用金型であり、該
金型１は雌型２及び雄型３の二つの金型より構成されて
いる。該雌型２にはキャビティー４の一部を形成する凹
部4aとスチームキャンバー5a,5bとが備えられており、
また雄型３にはキャビティー４の一部を形成する蓋部4b
とスチームチャンバー5bとが備えられている。In FIG. 1, reference numeral 1 is a molding die used in the method for producing a thermoplastic resin foam-molded product of the present invention, and the die 1 is composed of two dies, a female die 2 and a male die 3. There is. The female mold 2 is provided with a concave portion 4a forming a part of the cavity 4 and steam cambers 5a, 5b,
Further, the male mold 3 has a lid portion 4b which forms a part of the cavity 4.
And a steam chamber 5b.
該凹部4aとスチームチャンバー5aとの間及び蓋部4bと
スチームチャンバー5bとの間には、予備発泡樹脂粒子６
は通過しないが、キャビティー４内を減圧したり、キャ
ビティー４内の予備発泡樹脂粒子６を加熱するためのス
リット、キリ孔などのスチーム孔７が多数穿設されて両
者は互いに連通している。Pre-expanded resin particles 6 are provided between the recess 4a and the steam chamber 5a and between the lid 4b and the steam chamber 5b.
However, many steam holes 7 such as slits and drill holes for reducing the pressure in the cavity 4 and for heating the pre-expanded resin particles 6 in the cavity 4 are provided so that they communicate with each other. There is.
前記雌雄二つの金型2,3を合わせて閉型することによ
って、前記凹部4aの蓋部4b側が閉じられてキャビティー
４が形成される。By closing the two male and female dies 2, 3 together, the lid 4b side of the recess 4a is closed to form the cavity 4.
発泡成形物の製造は、上記キャビティー４の中に予備
発泡樹脂粒子６を充填した後、加熱し発泡させて行なう
が、該キャビティー４の中に予備発泡樹脂粒子６を充填
するには、予備発泡樹脂粒子６を充填ガン８の圧縮空気
噴出口8aより圧縮空気を噴出させることによって吸引し
てキャビティー４内に導く。The foamed molded product is produced by filling the cavity 4 with the pre-expanded resin particles 6 and then heating and foaming the pre-expanded resin particles 6. To fill the cavity 4 with the pre-expanded resin particles 6, The pre-foamed resin particles 6 are sucked by ejecting compressed air from the compressed air ejection port 8a of the filling gun 8 and guided into the cavity 4.
本発明の方法においては、該充填ガンを作動させ、ス
チームチャンバー5a,5bの下流に設置されている減圧装
置９によって、スチームチャンバー5a,5b及びキャビテ
ィー４内の空気を強制的に系外に排出して、予備発泡樹
脂粒子６を素早くキャビティー４内に導き入れる。In the method of the present invention, the filling gun is actuated, and the air inside the steam chambers 5a and 5b and the cavity 4 is forced out of the system by the decompression device 9 installed downstream of the steam chambers 5a and 5b. It is discharged and the pre-expanded resin particles 6 are quickly introduced into the cavity 4.
前記充填ガン８の駆動と減圧装置９の駆動により、両
者の給気と排気の量とが釣合うよう設定されているの
で、スチームチャンバー5a,5b及びキャビティー４内の
空気圧力は、一定に保たれたまま予備発泡樹脂粒子６が
充填される。By the drive of the filling gun 8 and the drive of the decompression device 9, the amounts of air supply and exhaust of both are set to be balanced, so that the air pressures in the steam chambers 5a and 5b and the cavity 4 are constant. The pre-expanded resin particles 6 are filled while being kept.
該キャビテイー４内の予備発泡樹脂粒子６の充填が進
行するにつれて、充填された予備発泡粒子による流動抵
抗が増加し、かつ、予備発泡粒子によりスチーム孔７が
閉塞されてゆくので、充填ガスよりの空気はキャビティ
ー４内を自由に通過し難くなり、一方、前記減圧装置９
によりスチームチャンバー5a,5b内の空気が強制的に系
外に排気されるので、スチームチャンバー5a,5b内は減
圧状態となる。As the filling of the pre-expanded resin particles 6 in the cavities 4 progresses, the flow resistance due to the filled pre-expanded particles increases, and the steam holes 7 are blocked by the pre-expanded particles. It becomes difficult for the air to freely pass through the cavity 4, while the pressure reducing device 9
As a result, the air in the steam chambers 5a, 5b is forcibly discharged to the outside of the system, so that the pressure inside the steam chambers 5a, 5b is reduced.
この時のスチームチャンバー5a,5b内の減圧度を減圧
装置のラインのパイプに備えつけられた圧力検出器10に
より検出することによって、そのキャビティー４内の閉
塞度、すなわち、キャビティー４内の予備発泡樹脂粒子
の充填度合を判定することができる。したがって、一定
の減圧度に達した時に前記充填ガン８の作動を停止させ
れば、キャビティー４内の予備発泡樹脂粒子６の充填量
を一定量にすることができる。At this time, the degree of decompression in the steam chambers 5a, 5b is detected by the pressure detector 10 provided in the pipe of the line of the decompression device, so that the degree of blockage in the cavity 4, that is, the backup in the cavity 4 is detected. The filling degree of the expanded resin particles can be determined. Therefore, if the operation of the filling gun 8 is stopped when the decompression degree reaches a certain level, the filling amount of the pre-expanded resin particles 6 in the cavity 4 can be made a certain amount.
前記減圧度の検出は、直接、金型のキャビティーの圧
力を測定することができないので、このキャビティーと
スチーム孔７で連絡されているスチームチャンバー5a,5
b以降のラインで行なわれるが、特にスチームチャンバ
ー5a,5bで行なうことが有利である。Since the pressure of the cavity of the mold cannot be directly measured in the detection of the degree of reduced pressure, the steam chambers 5a, 5 which communicate with the cavity through the steam holes 7
It is performed in the line after b, but it is particularly advantageous to perform it in the steam chambers 5a and 5b.
このときに圧力検出器10によって測定したスチームチ
ャンバー5a,5b内の減圧度の経時変化を第２図に示し、
以下に詳細に説明する。FIG. 2 shows the change over time in the degree of pressure reduction in the steam chambers 5a, 5b measured by the pressure detector 10 at this time.
The details will be described below.
先ず、前成形工程でのキャビテイー４内に残存するス
チームを除去するために、10aにて減圧装置９を作動さ
せてキャビティー４内を減圧にする。First, in order to remove the steam remaining in the cavity 4 in the preforming step, the depressurizing device 9 is operated at 10a to depressurize the inside of the cavity 4.
予め設定された減圧度10bに達した時点で、充填ガン
８の充填ピストン8bを後退させて、充填ガン８の開口部
8cを開放することにより、原料ホッパー11より供給され
る予備発泡樹脂粒子６をキャビティー４内に充填する。When the preset decompression degree 10b is reached, the filling piston 8b of the filling gun 8 is retracted to open the opening of the filling gun 8.
By opening 8c, the pre-expanded resin particles 6 supplied from the raw material hopper 11 are filled in the cavity 4.
それによってスチームチャンバー5a,5b内の圧力検出
器10は上昇して10cのように大気圧近くまで戻る。As a result, the pressure detector 10 in the steam chambers 5a and 5b rises and returns to near atmospheric pressure as in 10c.
その後、減圧装置９の駆動を継続させることによって
スチームチャンバー5a,5b及びキャビティー４内の空気
を排出し、両者の給気と排気の量が釣合って設定されて
いるので、スチームチャンバー5a,5b及びキャビティー
４内の圧力は大気圧近くのまま減圧が保持され、充填が
継続される。After that, by continuing the driving of the decompression device 9, the air in the steam chambers 5a, 5b and the cavity 4 is discharged, and the amounts of supply and discharge of both are set in a balanced manner. The pressure inside 5b and the cavity 4 is kept at a pressure close to the atmospheric pressure and the filling is continued.
充填が完了間際になると、前記圧縮空気がキャビティ
ー４内を自由に通過し難くなり、一方、減圧装置９によ
るスチームチャンバー5a,5b内の空気は強制的に系外に
排気され続けるので、スチームチャンバー5a,5b内は10d
のように徐々に減圧状態となる。When the filling is almost completed, it becomes difficult for the compressed air to freely pass through the cavity 4. On the other hand, the air in the steam chambers 5a and 5b by the decompression device 9 is forcibly discharged to the outside of the system, so 10d inside chambers 5a and 5b
The pressure is gradually reduced as shown in.
この時のスチームチャンバー5a,5b内の減圧度を圧力
検出器10により検出することによって、そのキャビティ
ー４内の閉塞度、すなわち、キャビティー４内の充填度
合いを判定することができることから、一定の減圧度10
eに達した時に前記充填ガン８の作動を停止させるよう
に予め設定しておくことにより、キャビティー４内の予
備発泡樹脂粒子６の充填量を一定量にすることができ
る。By detecting the degree of decompression in the steam chambers 5a, 5b at this time by the pressure detector 10, the degree of blockage in the cavity 4, that is, the degree of filling in the cavity 4 can be determined, and therefore, it is constant. Decompression degree of 10
By setting in advance that the operation of the filling gun 8 is stopped when reaching e, the filling amount of the pre-expanded resin particles 6 in the cavity 4 can be made constant.
また、この時に何らかの理由により原料ホッパー11よ
り予備発泡樹脂粒子６が供給されない場合には、予めタ
イマーを設定することにより警報を発して異常を知らせ
ることにより、原料の充填の異常が検出することができ
るので、充填不足による不良品を成形するおそれがな
い。Further, at this time, if the pre-expanded resin particles 6 are not supplied from the raw material hopper 11 for some reason at this time, an alarm is given by setting a timer in advance to notify the abnormality, so that the abnormality of the raw material filling can be detected. Therefore, there is no fear of molding a defective product due to insufficient filling.
10eに示すような予め設定された減圧度に達した時に
減圧装置９の作動を停止させる。When the preset pressure reduction degree as shown in 10e is reached, the operation of the pressure reducing device 9 is stopped.
その後、開放弁12を開放してキャビティー４及びスチ
ームチャンバー5a,5b内を10fのように大気圧に戻す。そ
の後、圧縮空気を充填ガン8aより噴出し、予備発泡粒子
をホッパー11に戻し、前記充填ガン８の充填ピストン8b
の前進によって充填が完了する。After that, the opening valve 12 is opened to return the inside of the cavity 4 and the steam chambers 5a and 5b to the atmospheric pressure like 10f. After that, compressed air is ejected from the filling gun 8a, the pre-expanded particles are returned to the hopper 11, and the filling piston 8b of the filling gun 8 is discharged.
The filling is completed by advancing the.
前記予め設定される減圧度とは一般に−0.01〜−0.80
kg/cm2Ｇ、好ましくは−0.10〜0.30kg/cm2Ｇである。The preset degree of reduced pressure is generally -0.01 to -0.80.
kg / cm 2 G, preferably -0.10~0.30kg / cm 2 G.
前記キャビティー４内に充填された予備発泡樹脂粒子
は、通常、この種熱可塑性樹脂発泡成形物の製造方法に
て実施されている成形方法と同様の方法にて成形するこ
とができる。The pre-expanded resin particles filled in the cavity 4 can be molded by a method similar to the molding method that is usually used in the method for producing a thermoplastic resin foam molded article of this kind.
このような成形に用いることができる予備発泡樹脂粒
子としては、ポリスチレン予備発泡粒子を用いることは
もちろんのこと、ポリプロピレン、ポリエチレン、エチ
レン・酢酸ビニル共重合体、エチレン・（メタ）アクリ
ル酸共重合体の金属塩、α−メチルスチレン・スチレン
・アクリロニトリル共重合体、スチレングラフトポリエ
チレン共重合体、スチレングラフトポリプロピレン及び
これらの架橋樹脂などの熱可塑性樹脂の発泡粒子にも応
用できる。これら予備発泡樹脂粒子の中ではポリスチレ
ン予備発泡粒子が好ましい。As the pre-expanded resin particles which can be used for such molding, not only polystyrene pre-expanded particles but also polypropylene, polyethylene, ethylene / vinyl acetate copolymer, ethylene / (meth) acrylic acid copolymer are used. It is also applicable to foamed particles of thermoplastic resins such as metal salts of α-methylstyrene / styrene / acrylonitrile copolymers, styrene-grafted polyethylene copolymers, styrene-grafted polypropylene and cross-linked resins thereof. Among these pre-expanded resin particles, polystyrene pre-expanded particles are preferable.
また、これら樹脂又は混合物にエチレン・プロピレン
共重合体ゴムやポリイソプレンゴムを配合した組成物よ
り得た予備発泡粒子を使用しても良い。予備発泡粒子は
嵩密度が一般に10〜100g/l、好ましくは10〜65g/l、粒
子径が0.5〜20mm、好ましくは２〜8mmのものがあげられ
る。また、予備発泡粒子は架橋されていても、架橋され
ていなくても良い。Further, pre-expanded particles obtained from a composition obtained by blending ethylene / propylene copolymer rubber or polyisoprene rubber with these resins or mixtures may be used. The pre-expanded particles have a bulk density of generally 10 to 100 g / l, preferably 10 to 65 g / l, and a particle size of 0.5 to 20 mm, preferably 2 to 8 mm. Further, the pre-expanded particles may or may not be crosslinked.
［実施例］ 実施例１及び２、比較例１ 雌雄二つの金型を閉型することによって形成されたキ
ャビティー内に予備発泡樹脂粒子を充填する前に、型内
に残存するスチーム及びエアーを排除するため、排気量
3.3m3/minのバキュームポンプを駆動させ、ドレン弁を
閉じ、バキューム弁を開けて、キャビティー内を−0.2k
g/cm2Ｇにまで減圧した。金型内のキャビティーを構成
するアルミニウム板にはスリット及びきり穴などが穿設
されており、スチーム及びエアーは通過することができ
る構造になっているが、予備発泡樹脂粒子はキャビティ
ーよりスチームチャンバーに通過することができない。[Examples] Examples 1 and 2, Comparative Example 1 Before filling the pre-expanded resin particles into the cavity formed by closing the two molds of male and female, the steam and air remaining in the mold were removed. Exhaust volume to eliminate
Drive the 3.3m 3 / min vacuum pump, close the drain valve, open the vacuum valve, and set −0.2k in the cavity.
The pressure was reduced to g / cm 2 G. The aluminum plate that constitutes the cavity in the mold has holes such as slits and perforations, which allows the passage of steam and air, but the pre-expanded resin particles are steamed from the cavity. Cannot pass into the chamber.
排気が終了したら、断面積150cm2に充填ガンの開口部
を開けて、減圧装置を駆動させて原料である予備発泡樹
脂粒子を吸引してキャビティー内に充填した。この時の
型内圧力は−0.05kg/cm2Ｇであった。前記予備発泡樹脂
粒子として三菱油化バーディッシェ（株）製ポリスチレ
ン予備発泡粒子FMC−250グレード（60倍発泡品）を使用
した。After the evacuation was completed, the opening of the filling gun was opened in the cross-sectional area of 150 cm 2 , and the decompressor was driven to suck the pre-expanded resin particles as the raw material to fill the cavity. The pressure in the mold at this time was -0.05 kg / cm 2 G. As the pre-expanded resin particles, polystyrene pre-expanded particles FMC-250 grade (60 times expanded product) manufactured by Mitsubishi Petrochemical Birdiche Co., Ltd. were used.
キャビティー内に発泡粒子が充満すると型内圧力が減
圧となり、予め設定した充填完了圧力−0.20kg/cm2Ｇに
達した時点でバキューム弁が閉じられ、大気圧弁が開放
されて、型内のキャビティー内の圧力を大気圧に戻し
た。When the cavity is filled with expanded particles, the pressure inside the mold is reduced, and when the preset filling completion pressure of -0.20 kg / cm 2 G is reached, the vacuum valve is closed, the atmospheric pressure valve is opened, and the inside of the mold is closed. The pressure inside the cavity was returned to atmospheric pressure.
その後、圧縮空気を8aより噴出し予備発泡粒子をホッ
パー11に戻し、充填ガンの充填ピストンを前進させて、
充填ガンの開口部を閉じた。After that, compressed air is ejected from 8a to return the pre-expanded particles to the hopper 11, and the filling piston of the filling gun is advanced,
The filling gun opening was closed.
次いで、スチームチャンバーにスチームを供給して11
5℃に加熱し、40秒間保持した後冷却し、取り出した製
品は良好であった。Then, steam was supplied to the steam chamber 11
The product taken out after heating to 5 ° C., holding for 40 seconds and then cooling was good.
得られた製品の大きさは、1845×930×425mmのもの
で、評価結果は表−１に示す。The size of the obtained product is 1845 × 930 × 425 mm, and the evaluation results are shown in Table-1.
［発明の効果］ 本発明の熱可塑性樹脂発泡成形物の製造方法によって
得られる熱可塑性樹脂発泡成形物は、減圧装置を駆動さ
せ、スチームチャンバーの減圧度によって充填ガンの作
動を停止させることによって、キャビティー内に短時間
で、かつ予備発泡樹脂粒子を一定な量で充填することが
できるので、一定な品質を備えた成形加工品が得られ
る。 [Effects of the Invention] The thermoplastic resin foam-molded product obtained by the method for producing a thermoplastic resin foam-molded product of the present invention has a decompression device driven to stop the operation of the filling gun according to the degree of decompression of the steam chamber. Since the cavity can be filled with the pre-expanded resin particles in a constant amount in a short time, a molded product having a constant quality can be obtained.
また、何らかの理由により原料ホッパーより予備発泡
樹脂粒子が供給されない場合においても、予めタイマー
を設定しておけば、警報を発して異常を知らせることも
できる。Further, even when the pre-expanded resin particles are not supplied from the raw material hopper for some reason, if a timer is set in advance, an alarm can be issued to notify the abnormality.
第１図は本発明実施例の熱可塑性樹脂発泡成形物の製造
方法に用いられる成形用金型の断面図とその制御ライン
の概略図であり、第２図は予備発泡樹脂粒子の充填時の
成形用金型におけるスチームチャンバー内の減圧度の経
時変化を表わす図である。 1:成形用金型、2:雌型 3:雄型、4:キャビティー 4a:凹部、4b:蓋部 5a,5b:スチームチャンバー 6:予備発泡樹脂粒子 7:スチーム孔、8:充填ガン 8a:圧縮空気噴出口 9:減圧装置、10:圧力検出器 11:原料ホッパー、12:開放弁FIG. 1 is a cross-sectional view of a molding die used in a method for producing a thermoplastic resin foam-molded article according to an embodiment of the present invention and a schematic view of a control line thereof, and FIG. It is a figure showing the time-dependent change of the pressure reduction degree in the steam chamber in a metal mold for molding. 1: Mold for molding, 2: Female 3: Male, 4: Cavity 4a: Recess, 4b: Lid 5a, 5b: Steam chamber 6: Pre-foamed resin particles 7: Steam hole, 8: Filling gun 8a : Compressed air jet 9: Pressure reducing device, 10: Pressure detector 11: Raw material hopper, 12: Open valve
Claims (4)
た雌雄二つの金型を閉型することによって形成されるキ
ャビティー内に、減圧装置を駆動させてキャビティー内
の空気を排出し、その吸引力により予備発泡樹脂粒子を
充填した後、金型を加熱して、熱可塑性樹脂発泡成形物
を製造する方法において、減圧装置を駆動させて、キャ
ビティー内の空気を排出しキャビティー内を減圧にした
後、充填ガンを作動させて、予備発泡樹脂粒子をキャビ
ティー内に導き、該キャビティー内に予備発泡樹脂粒子
が充填されることによって生じる減圧度を検出し、該減
圧度が所定の減圧度に達した時に前記充填ガンの作動を
停止させて予備発泡樹脂粒子の充填を停止することを特
徴とする熱可塑性樹脂発泡成形物の製造方法。1. A decompression device is driven into a cavity formed by closing two molds having a steam chamber and a steam hole, and air in the cavity is discharged, and its suction force is exerted. After filling the pre-expanded resin particles with, the mold is heated to produce a thermoplastic resin foam molded product, in which a decompression device is driven to discharge air in the cavity and reduce the pressure in the cavity. After that, the filling gun is operated to guide the pre-expanded resin particles into the cavity, and the degree of decompression caused by filling the pre-expanded resin particles in the cavity is detected. The method for producing a thermoplastic resin foam-molded article, characterized in that the operation of the filling gun is stopped to stop the filling of the pre-expanded resin particles when the temperature reaches a certain level.
〜−0.80kg/cm2Ｇに達した時点で行なう特許請求の範囲
第１項に記載の熱可塑性樹脂発泡成形物の製造方法。2. The decompression degree is -0.01 when the operation of the filling gun is stopped.
The method for producing a thermoplastic resin foam-molded article according to claim 1, which is carried out at a time when the amount reaches to -0.80 kg / cm 2 G.
減圧度で行なう特許請求の範囲第１項又は第２項に記載
の熱可塑性樹脂発泡成形物の製造方法。3. The method for producing a thermoplastic resin foam-molded product according to claim 1, wherein the degree of reduced pressure is detected by the degree of reduced pressure in the steam chamber.
を中断させる安全対策を設けた特許請求の範囲第１項か
ら第３項までのいずれかに記載の熱可塑性樹脂発泡成形
物の製造方法。4. A thermoplastic resin foam molded article according to any one of claims 1 to 3, which is provided with a safety measure for detecting insufficient filling within a set time and interrupting the molding process. Production method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62286776A JPH0813479B2 (en) | 1987-11-13 | 1987-11-13 | Method for producing thermoplastic resin foam molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62286776A JPH0813479B2 (en) | 1987-11-13 | 1987-11-13 | Method for producing thermoplastic resin foam molding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01127323A JPH01127323A (en) | 1989-05-19 |
| JPH0813479B2 true JPH0813479B2 (en) | 1996-02-14 |
Family
ID=17708901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62286776A Expired - Fee Related JPH0813479B2 (en) | 1987-11-13 | 1987-11-13 | Method for producing thermoplastic resin foam molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0813479B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013154910A (en) * | 2012-01-30 | 2013-08-15 | Sekisui Plastics Co Ltd | Foamed container, and method for manufacturing the same |
-
1987
- 1987-11-13 JP JP62286776A patent/JPH0813479B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01127323A (en) | 1989-05-19 |
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