JPH0645721B2 - Method for producing pre-expanded thermoplastic resin particles - Google Patents
Method for producing pre-expanded thermoplastic resin particlesInfo
- Publication number
- JPH0645721B2 JPH0645721B2 JP60156323A JP15632385A JPH0645721B2 JP H0645721 B2 JPH0645721 B2 JP H0645721B2 JP 60156323 A JP60156323 A JP 60156323A JP 15632385 A JP15632385 A JP 15632385A JP H0645721 B2 JPH0645721 B2 JP H0645721B2
- Authority
- JP
- Japan
- Prior art keywords
- tank
- expanded particles
- pressure
- foaming
- 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
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Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は熱可塑性樹脂予備発泡粒子の製造法に関する。TECHNICAL FIELD The present invention relates to a method for producing pre-expanded thermoplastic resin particles.
断熱材,緩衝材,防音材,包装材等として合成樹脂予備
発泡粒子を成型用型内で所定形状に発泡成型してなる型
内発泡成型体が広く用いられている。上記型内発泡成型
体の製造に用いられる予備発泡粒子は,樹脂粒子に発泡
剤を含有せしめて加熱発泡する等により得られるが,よ
り高発泡倍率でかつ物性に優れた予備発泡粒子を得るた
め,樹脂粒子を発泡させて得た予備発泡粒子に発泡能を
付与した後,再び加熱発泡せしめる二段発泡法が提案さ
れている(特開昭54−31475号公報,特開昭59
−133233号公報等)。BACKGROUND ART In-mold foam moldings obtained by foam molding synthetic resin pre-expanded particles into a predetermined shape in a molding mold are widely used as heat insulating materials, cushioning materials, soundproofing materials, packaging materials, and the like. The pre-expanded particles used in the production of the in-mold expanded molded article can be obtained by, for example, heat-foaming by adding a foaming agent to resin particles, but to obtain pre-expanded particles having a higher expansion ratio and excellent physical properties. A two-stage foaming method has been proposed in which pre-expanded particles obtained by foaming resin particles are given a foaming ability and then again heat-expanded (JP-A-54-31475 and JP-A-59).
-133233 publication).
従来,二段発泡法においては予備発泡粒子を無機ガス等
により加圧して粒子内圧を高め,予備発泡粒子に発泡能
を付与した後,予備発泡粒子を貯蔵槽等に蓄えておき,
必要に応じて貯蔵槽等より発泡能を付与された予備発泡
粒子を一担ホッパーに取出して該ホッパーより1回の二
段発泡に必要な予備発泡粒子を計量して発泡槽に充填し
て加熱発泡を行なっている。しかしながら,発泡能を付
与された予備発泡粒子を貯蔵槽等に畜えておく間やホッ
パーに取出した際に予備発泡粒子が大気圧下にさらされ
るため,発泡時間の経過とともに粒子内圧の低下(発泡
能低下)をきたし,目的とする高発泡倍率の予備発泡粒
子を得難くなるという問題があり,また貯蔵槽等に畜え
ておく間の内圧低下分を補い得る粒子内圧を付与するに
は,予備発泡粒子を更に高い圧力で長時間加圧しなけれ
ばならず,高い圧力に耐えられる装置が必要となるとと
もに作業効率低下をきたすという問題があった。更に従
来の方法ではホッパーから発泡槽に予備発泡粒子を充填
する際にホッパーと発泡槽との間に圧力差がないために
充填に長時間を要し,そのため発泡サイクルに占める充
填時間が長いという問題があった。Conventionally, in the two-stage foaming method, the pre-expanded particles are pressurized with an inorganic gas or the like to increase the internal pressure of the particles to give the pre-expanded particles a foaming ability, and then the pre-expanded particles are stored in a storage tank or the like.
If necessary, extract the pre-expanded particles that have been given a foaming ability from a storage tank or the like into a hopper, and measure the pre-expanded particles required for one-time two-stage expansion from the hopper, fill the foaming tank, and heat. It is foaming. However, the pre-expanded particles are exposed to the atmospheric pressure while they are stored in a storage tank or when they are taken out into a hopper, so that the internal pressure of the particles decreases (foaming time) as the foaming time elapses. There is a problem in that it is difficult to obtain the pre-expanded particles with the desired high expansion ratio, and in order to apply the internal pressure of particles that can compensate for the decrease in internal pressure during storage in a storage tank, etc. The expanded particles have to be pressurized at a higher pressure for a long time, which requires a device capable of withstanding the high pressure and causes a decrease in work efficiency. Further, in the conventional method, when the pre-expanded particles are filled from the hopper into the foaming tank, there is no pressure difference between the hopper and the foaming tank, so that the filling takes a long time, and therefore the filling time in the foaming cycle is long. There was a problem.
本発明者らは上記問題を解決すべく鋭意研究した結果,
発泡能を付与した予備発泡粒子を加熱して再発泡せしめ
るまでの間,加圧タンク内で加圧下に保持する方法を見
い出したが,加圧下に保持された予備発泡粒子のうちの
所定量を計量して取出す際に,加圧タンク内圧力と計量
装置間との圧力差が大きく,予備発泡粒子は加圧タンク
内より急激に押出されるため,1回の発泡に必要な量の
予備発泡粒子を正確に取出すことが困難であるという問
題があった。As a result of intensive studies to solve the above problems, the present inventors have found that
We have found a method of holding the pre-expanded particles with expanding ability under pressure in a pressure tank until the pre-expanded particles are heated and re-expanded. When measuring and taking out, the pressure difference between the pressure inside the pressure tank and the measuring device is large, and the pre-expanded particles are extruded rapidly from the inside of the pressure tank. There is a problem that it is difficult to accurately take out the particles.
そこで本発明者らは更に鋭意研究した結果,所定の内容
積を有する計量タンクに予備発泡粒子を圧送充填して所
定量の予備発泡粒子を計量タンクに分取するとともに該
計量タンク内で予備発泡粒子を加圧し,次いで加圧状態
におかれた計量タンク内の予備発泡粒子を発泡槽に圧送
して発泡せしめることにより上記問題が全て解消される
とともに,より高発泡倍率の予備発泡粒子を容易に製造
し得ることを見出し本発明を完成するに至った。Therefore, as a result of further intensive research, the inventors of the present invention pressure-charged and filled the pre-expanded particles in a metering tank having a predetermined internal volume to dispense a predetermined amount of the pre-expanded particles into the metering tank and pre-foam in the metering tank. All the above problems are solved by pressurizing the particles and then pre-expanding the pre-expanded particles in the metering tank that is in a pressurized state to the foaming tank for foaming, and it is easy to obtain pre-expanded particles with a higher expansion ratio. The present invention has been completed and the present invention has been completed.
本発明は発泡能が付与された熱可塑性樹脂予備発泡粒子
を加圧タンク内にて加圧下に保持し,次いで所定の内容
積を有する計量タンクに予備発泡粒子を圧送充填して所
定量の予備発泡粒子を計量タンクに分取するとともに該
計量タンク内で予備発泡粒子を加圧し,しかる後加圧状
態におかれた計量タンク内の予備発泡粒子を発泡槽に圧
送し,該発泡槽内で予備発泡粒子を加熱発泡せしめて元
の発泡倍率より高発泡倍率の熱可塑性樹脂予備発泡粒子
を製造する方法である。According to the present invention, the thermoplastic resin pre-expanded particles to which the foaming ability is applied are kept under pressure in a pressure tank, and then the pre-expanded particles are pressure-fed into a measuring tank having a predetermined internal volume to fill a predetermined amount of the pre-expanded particles. The foamed particles are collected in a measuring tank, and the pre-foamed particles are pressurized in the measuring tank, and then the pre-foamed particles in the measuring tank which are in a pressurized state are pressure-fed to the foaming tank, and in the foaming tank. This is a method for producing pre-expanded thermoplastic resin particles having a higher expansion ratio than the original expansion ratio by heat-expanding the pre-expanded particles.
以下本発明を図面に基き詳細に説明する。The present invention will be described in detail below with reference to the drawings.
第1図において1は加圧タンクで,該加圧タンク1内に
は発泡能を付与された熱可塑性樹脂予備発泡粒子が加圧
下に保持されている。In FIG. 1, reference numeral 1 is a pressure tank in which pre-expanded thermoplastic resin particles having a foaming ability are held under pressure.
本発明において用いられる熱可塑性樹脂予備発泡粒子の
基材としてはスチレン系樹脂,エチレン系樹脂,プロピ
レン系樹脂等が挙げられるが,中でもエチレン系樹脂,
プロピレン系樹脂等のポリオレフィンが好ましく,特に
ポリプロピレンやエチレン−プロピレンランダム共重合
体,エチレン−プロピレンブロック共重合体(いずれも
プロピレン成分50重量%以上)等のプロピレン系樹脂
が好ましい。Examples of the base material of the thermoplastic resin pre-expanded particles used in the present invention include styrene resin, ethylene resin, propylene resin, and the like. Among them, ethylene resin,
Polyolefin such as propylene-based resin is preferable, and propylene-based resin such as polypropylene, ethylene-propylene random copolymer, ethylene-propylene block copolymer (all 50% by weight or more of propylene component) is particularly preferable.
上記予備発泡粒子は,熱可塑性樹脂粒子に例えばプロパ
ン,ブタン,n−ペンタン,イソペンタン等の脂肪族炭
化水素類,ジクロロジフロロメタン,テトラフロロエタ
ン,トリクロロフロロメタン,塩化メチル,塩化エチル
等のハロゲン化炭化水素類等の如き揮発性発泡剤や空
気,窒素,二酸化炭素,アルゴン,ヘリウム等の無機ガ
ス等,通常の発泡に用いられる発泡剤の一種又は二種以
上を含有せしめた後,加熱発泡せしめる等の方法により
得られるものが用いられるが,発泡倍率4〜40倍のも
のが好ましい。The pre-expanded particles include thermoplastic resin particles, for example, aliphatic hydrocarbons such as propane, butane, n-pentane and isopentane, halogens such as dichlorodifluoromethane, tetrafluoroethane, trichlorofluoromethane, methyl chloride and ethyl chloride. Foaming agents such as volatile hydrocarbons and inorganic gases such as air, nitrogen, carbon dioxide, argon, helium, etc., and one or more kinds of foaming agents used for ordinary foaming, and then heat foaming A product obtained by a method such as caulking is used, but a foaming ratio of 4 to 40 is preferable.
本発明において予備発泡粒子への発泡能の付与は,予備
発泡粒子を樹脂粒子の発泡に用いられると同様の無機ガ
ス,揮発性発泡剤あるいは無機ガスと揮発性発泡剤との
混合ガスにより加圧処理することによって行なわれ、0.
5〜10kg/cm2(G)の内圧を付与することが好ましい。
上記加圧処理は加圧タンク1で行なっても,別工程にお
いて行なっても良い。In the present invention, the foaming ability is given to the pre-expanded particles by pressurizing the pre-expanded particles with an inorganic gas, a volatile foaming agent or a mixed gas of an inorganic gas and a volatile foaming agent similar to those used for foaming resin particles. Done by processing 0.
It is preferable to apply an internal pressure of 5 to 10 kg / cm 2 (G).
The above pressure treatment may be performed in the pressure tank 1 or in a separate process.
加圧タンク1は加圧用レギュレーター2によって予備発
泡粒子を所定の圧力下に保持できるよう構成されてい
る。加圧タンク1内において予備発泡粒子を加圧保持す
る圧力は0.5〜10kg/cm2(G)が好ましい。また加圧タ
ンク1において予備発泡粒子を加圧するとともに加熱し
ておくことが好ましく,この加熱は通常0.5〜1.7kg/cm
2(G)程度の蒸気にて行なうことが好ましい。The pressure tank 1 is configured so that the pre-expanded particles can be kept under a predetermined pressure by the pressure regulator 2. The pressure for holding the pre-expanded particles in the pressure tank 1 under pressure is preferably 0.5 to 10 kg / cm 2 (G). Further, it is preferable to pressurize and heat the pre-expanded particles in the pressure tank 1, which is usually 0.5 to 1.7 kg / cm.
It is preferable to use steam of about 2 (G).
加圧タンク1内で加圧保持された予備発泡粒子を第1の
計量タンク4および/または第2の計量タンク5に圧送
充填して分取することにより,第1の計量タンク4およ
び/または第2の計量タンク5の内容積に応じた1回の
発泡に必要な量の予備発泡粒子が計量される。予備発泡
粒子を第1の計量タンク4のみに圧送充填して分取する
か,第2の計量タンク5のみに圧送充填して分取する
か,あるいは第1の計量タンク4および第2の計量タン
ク5の両方に圧送充填して分取するかは発泡槽3におい
て予備発泡粒子を発泡せしめる倍率に応じて選択され
る。即ち発泡槽3において高発泡倍率に発泡せしめる場
合には内容積の小さい第1の計量タンク4を選択し,発
泡せしめる倍率が低い場合には内容積の大きい第2の計
量タンク5を選択し,発泡せしめる倍率が更に低い場合
には第1の計量タンク4および第2の計量タンク5の両
方に予備発泡粒子を圧送充填して分取する。各計量タン
ク4,5には圧力センサー等の充填検出手段が設けら
れ,完全に充填が行われると加圧タンク1の開閉弁6が
閉じられ,加圧タンク1からの予備発泡粒子の圧送が終
了する。The pre-expanded particles held under pressure in the pressure tank 1 are pressure-fed and filled into the first measurement tank 4 and / or the second measurement tank 5 to collect the pre-expanded particles. The amount of pre-expanded particles required for one expansion according to the internal volume of the second measuring tank 5 is measured. Whether the pre-expanded particles are pumped and filled only in the first weighing tank 4 or sorted, or only the second weighing tank 5 is pumped and filled in and collected, or the first weighing tank 4 and the second weighing tank Whether or not both of the tanks 5 are pressure-fed and filled is selected according to the expansion ratio of the pre-expanded particles in the foaming tank 3. That is, when the foaming tank 3 is to be expanded to a high expansion ratio, the first measuring tank 4 having a small internal volume is selected, and when the expansion ratio is low, the second measuring tank 5 having a large internal volume is selected. When the expansion ratio is lower, the pre-expanded particles are pressure-filled and collected in both the first measuring tank 4 and the second measuring tank 5. Each of the measuring tanks 4 and 5 is provided with a filling detecting means such as a pressure sensor, and when the filling is completed, the opening / closing valve 6 of the pressurizing tank 1 is closed so that the pre-expanded particles from the pressurizing tank 1 are fed under pressure. finish.
計量タンク4および/または5に充填された予備発泡粒
子は計量タンク4および/または計量タンク5内におい
て加圧される。この加圧は0.5〜10kg/cm2(G)で行う
ことが好ましい。The pre-expanded particles filled in the measuring tanks 4 and / or 5 are pressurized in the measuring tanks 4 and / or 5. This pressurization is preferably performed at 0.5 to 10 kg / cm 2 (G).
計量タンク4および/または計量タンク5に分取されて
加圧された予備発泡粒子は,例えば予備発泡粒子が第1
計量タンク4のみに分取された場合,第1の計量タンク
開閉弁7,第2の計量タンク開閉弁8が開き,予備発泡
粒子は第2の計量タンク5内を通過して発泡槽3に圧送
される。この時の第1の計量タンク4と発泡槽3との間
に圧力差があるため(発泡槽3内圧は大気圧と同等であ
る。)短時間に予備発泡粒子が発泡槽3に移送される。
発泡槽3への予備発泡粒子の圧送が終了すると第1の計
量タンク開閉弁7,第2の計量タンク開閉弁8が閉じら
れる。The pre-expanded particles that have been separated and pressurized in the measurement tank 4 and / or the measurement tank 5 are, for example, the first pre-expanded particles.
When it is collected only in the measuring tank 4, the first measuring tank opening / closing valve 7 and the second measuring tank opening / closing valve 8 are opened, and the pre-expanded particles pass through the second measuring tank 5 into the foaming tank 3. Pumped. At this time, since there is a pressure difference between the first measuring tank 4 and the foaming tank 3 (the internal pressure of the foaming tank 3 is equal to the atmospheric pressure), the pre-foamed particles are transferred to the foaming tank 3 in a short time. .
When the pressure-feeding of the pre-expanded particles to the foaming tank 3 is completed, the first measuring tank opening / closing valve 7 and the second measuring tank opening / closing valve 8 are closed.
発泡槽3において予備発泡粒子は撹拌下に加熱され元の
発泡倍率より高発泡倍率,好ましくは元の発泡倍率の1.
5〜7倍に発泡せしめられる。発泡槽3における予備発
泡粒子の加熱は通常加熱蒸気によって行なわれ,該蒸気
圧力は0.5〜2kg/cm2(G)程度が好ましい。In the foaming tank 3, the pre-expanded particles are heated with stirring and have a higher expansion ratio than the original expansion ratio, preferably 1.
It can be foamed 5 to 7 times. The pre-expanded particles in the foaming tank 3 are usually heated by heating steam, and the steam pressure is preferably about 0.5 to 2 kg / cm 2 (G).
尚第1図において13は三方弁,14はサイレンサー、
15は発泡槽3に加熱蒸気を供給する蒸気管である。In FIG. 1, 13 is a three-way valve, 14 is a silencer,
Reference numeral 15 is a steam pipe for supplying heating steam to the foaming tank 3.
上記製造装置においては異なる内容積の2つの計量タン
クを直列に連結した場合について説明したが計量タンク
は1つでもあるいは3つ以上でも良く,更に複数の計量
タンクを並列に連結しても良い。また第2図に示す如く
計量タンク9を固定タンク10と上下に移動可能な可動
タンク11とから構成し,可動タンク11を上下動せし
めることにより計量タンク9の内容積を1回の発泡に必
要な予備発泡粒子の量に応じて調整可能に構成しても良
い。内容積可変の計量タンク9を用いた場合,発泡倍率
の種々異なる予備発泡粒子を製造する場合にも容易に対
応することができる。In the above manufacturing apparatus, the case where two weighing tanks having different internal volumes are connected in series has been described, but the number of measuring tanks may be one or three or more, and a plurality of measuring tanks may be connected in parallel. As shown in FIG. 2, the measuring tank 9 is composed of a fixed tank 10 and a movable tank 11 which can be moved up and down. By moving the movable tank 11 up and down, the internal volume of the measuring tank 9 is required for one foaming. It may be configured to be adjustable according to the amount of such pre-expanded particles. When the measuring tank 9 having a variable inner volume is used, it is possible to easily deal with the case of manufacturing pre-expanded particles having different expansion ratios.
尚,第2図において12は内容積表示目盛である。In FIG. 2, reference numeral 12 is an internal volume display scale.
以下,実施例を挙げて本発明を更に詳細に説明する。 Hereinafter, the present invention will be described in more detail with reference to examples.
実施例1〜4 加圧タンクと,内容積可変型計量タンクと,500の発
泡槽とを連結した装置を用い,まず第1表に示す予備発
泡粒子を加圧タンク内で空気にて加圧処理して第1表に
示す内圧を付与した後,加圧タンク内で同表に示す圧力
下に2日間保持した。次に計量タンク内容積を第1表に
示す大きさに設定し,加圧タンクより計量タンクに予備
発泡粒子を圧送充填して分取した後,計量タンク内の予
備発泡粒子を第1表に示す圧力で加圧し,次いで計量タ
ンク内の予備発泡粒子を発泡槽に圧送し,第1表に示す
圧力の蒸気にて加熱して同表に示す嵩発泡倍率の予備発
泡粒子を得た。計量タンクから発泡槽に予備発泡粒子を
移送するのに要した時間を第1表に示す。この操作を1
0回くり返し,1回目の予備発泡粒子と10回目の予備
発泡粒子の嵩発泡倍率を測定した結果を第1表にあわせ
て示す。Examples 1 to 4 First, pre-expanded particles shown in Table 1 were pressurized with air in a pressure tank by using a device in which a pressure tank, a variable inner volume measuring tank, and 500 foaming tanks were connected. After the treatment and application of the internal pressure shown in Table 1, the pressure was held in the pressure tank for 2 days under the pressure shown in the same table. Next, set the internal volume of the measuring tank to the size shown in Table 1, pressure-feed the pre-expanded particles to the measuring tank from the pressure tank, and collect the pre-expanded particles. The pre-expanded particles in the measuring tank were pressure-fed to the foaming tank and heated with steam having the pressure shown in Table 1 to obtain the pre-expanded particles having the bulk expansion ratio shown in the same table. Table 1 shows the time required to transfer the pre-expanded particles from the measuring tank to the foaming tank. This operation 1
The results of measurement of the bulk expansion ratio of the first pre-expanded particles and the tenth pre-expanded particles repeated 0 times are also shown in Table 1.
比較例1〜4 各々実施例1〜4と同様の予備発泡粒子を加圧タンク内
で加圧処理して上記各実施例と同様の内圧を付与した
後,加圧タンク内の圧力を開放し大気圧とした。次いで
この予備発泡粒子をブローアーで貯蔵槽に移し大気圧下
で2日間保持した後,該貯蔵槽から第1表に示す内容積
に設定した実施例1〜4と同様の計量タンクにブローア
ーで移送充填して所定量の予備発泡粒子を分取した。次
いで計量タンク内の予備発泡粒子を加圧することなく発
泡槽に移送し,第1表に示す圧力の蒸気で加熱して同表
に示す嵩発泡倍率の予備発泡粒子を得た。計量タンクか
ら発泡槽に予備発泡粒子を充填するのに要した時間を第
1表に示す。この操作を10回くり返し,1回目と10
回目の予備発泡粒子の嵩発泡倍率を測定した結果を第1
表にあわせて示す。Comparative Examples 1 to 4 Pre-expanded particles similar to those in Examples 1 to 4 were pressure-treated in a pressure tank to give the same internal pressure as in the above Examples, and then the pressure in the pressure tank was released. It was atmospheric pressure. Then, the pre-expanded particles were transferred to a storage tank by a blower and kept at atmospheric pressure for 2 days, and then transferred from the storage tank to a measuring tank similar to those in Examples 1 to 4 having the internal volume shown in Table 1 by a blower. After filling, a predetermined amount of pre-expanded particles was collected. Next, the pre-expanded particles in the measuring tank were transferred to the foaming tank without pressurization and heated with the steam having the pressure shown in Table 1 to obtain the pre-expanded particles having the bulk expansion ratio shown in the same table. Table 1 shows the time required to fill the pre-expanded particles from the measuring tank into the foaming tank. Repeat this operation 10 times, the first time and 10
The first measurement result of the bulk expansion ratio of the pre-expanded particles
Shown according to the table.
〔発明の効果〕 本発明は,熱可塑性樹脂予備発泡粒子に発泡能を付与し
た後,加熱発泡せしめて元の発泡倍率より高発泡倍率の
予備発泡粒子を製造する方法において,発泡能を付与し
た予備発泡粒子を発泡直前まで加圧タンク内で加圧下に
保持し,次いで加圧タンクより所定の内容積の計量タン
クに圧送充填して所定量を分取した後,計量タンク内で
加圧し,しかる後,加圧状態におかれた計量タンク内の
予備発泡粒子を発泡槽に圧送して発泡せしめる方法を採
用したため,発泡能を付与した予備発泡粒子の内圧が,
発泡を行なうまでの間に低下する虞れがなく,このため
予め内圧低下分を補い得るだけの高い内圧を付与せずと
も容易に高発泡倍率で発泡倍率のバラツキの少ない予備
発泡粒子を得ることができる。また計量タンクに所定量
分取した予備発泡粒子を計量タンク内において加圧する
ため,計量タンクから発泡槽へ予備発泡粒子を移送する
際の計量タンク内と発泡槽内との圧力差が大きく,この
ため予備発泡粒子を発泡槽に短時間で移送することがで
き,効率良い製造を行なうことができる等の効果を有す
る。 EFFECTS OF THE INVENTION The present invention provides a foaming ability in a method for producing pre-expanded particles having a higher expansion ratio than the original expansion ratio by imparting expansion ability to thermoplastic resin pre-expanded particles and then heat-expanding the mixture. The pre-expanded particles are kept under pressure in the pressure tank until just before foaming, and then pressure-filled from the pressure tank to a measuring tank having a predetermined internal volume to collect a predetermined amount, and then pressure is applied in the measuring tank. After that, a method was adopted in which the pre-expanded particles in the weighing tank placed under pressure were sent to the foaming tank to cause them to expand.
There is no risk of the pre-expanded particles being reduced before foaming. Therefore, it is possible to easily obtain pre-expanded particles with a high expansion ratio and a small expansion ratio variation without applying a high internal pressure that can compensate for the decrease in internal pressure in advance. You can In addition, since the pre-expanded particles collected in a predetermined amount in the measuring tank are pressurized in the measuring tank, the pressure difference between the measuring tank and the foaming tank when transferring the pre-expanded particles from the measuring tank to the foaming tank is large. Therefore, the pre-expanded particles can be transferred to the foaming tank in a short time, and the production can be efficiently performed.
図面は本発明の一実施例を示し,第1図は本発明製造方
法の実施に係る製造装置の一例を示す略図,第2図は計
量タンクの他の態様を示す縦断面図である。 1…加圧タンク、3…発泡槽 4,5,9…計量タンクThe drawings show an embodiment of the present invention, FIG. 1 is a schematic view showing an example of a manufacturing apparatus for carrying out the manufacturing method of the present invention, and FIG. 2 is a longitudinal sectional view showing another embodiment of a weighing tank. 1 ... Pressurized tank, 3 ... Foaming tank 4, 5, 9 ... Measuring tank
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭51−147567(JP,A) 特公 昭53−42789(JP,B2) 実公 昭55−42909(JP,Y2) 実公 昭59−3870(JP,Y2) ─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-51-147567 (JP, A) JP-B-53-42789 (JP, B2) JP-B-55-42909 (JP, Y2) JP-B-59- 3870 (JP, Y2)
Claims (8)
粒子を加圧タンク内にて加圧下に保持し、次いで所定の
内容積を有する計量タンクに予備発泡粒子を圧送充填し
て所定量の予備発泡粒子を計量タンクに分取するととも
に該計量タンク内で予備発泡粒子を加圧し、しかる後加
圧状態におかれた計量タンク内の予備発泡粒子を発泡槽
に圧送し、該発泡槽内で予備発泡粒子を加熱して元の発
泡倍率より高倍率に発泡させることを特徴とする熱可塑
性樹脂予備発泡粒子の製造法。1. A thermoplastic resin pre-expanded particle having a foaming ability is held under pressure in a pressure tank, and then the pre-expanded particle is pressure-fed and filled into a measuring tank having a predetermined internal volume to obtain a predetermined amount. Of the pre-expanded particles in the measuring tank and pressurize the pre-expanded particles in the measuring tank, and then the pre-expanded particles in the pressurized tank in a pressurized state are pressure-fed to the foaming tank. A method for producing pre-expanded particles of a thermoplastic resin, characterized in that the pre-expanded particles are heated therein to expand at a higher expansion ratio than the original expansion ratio.
リオレフィンである特許請求の範囲第1項記載の製造
法。2. The production method according to claim 1, wherein the base resin of the thermoplastic resin pre-expanded particles is polyolefin.
特許請求の範囲第2項記載の製造法。3. The method according to claim 2, wherein the polyolefin is a propylene resin.
粒子の粒子内圧が0.5〜10kg/cm2(G)である特許請求
の範囲第1項記載の製造法。4. The method according to claim 1, wherein the pre-expanded thermoplastic resin particles having the foaming ability have an internal pressure of 0.5 to 10 kg / cm 2 (G).
粒子の発泡倍率が4〜40倍である特許請求の範囲第1
項記載の製造法。5. The expansion ratio of the thermoplastic resin pre-expanded particles to which the foaming ability has been given is 4 to 40 times.
The manufacturing method described in the item.
を0.5〜10kg/cm2(G)の圧力で加圧保持する特許請求
の範囲第1項記載の製造法。6. The method according to claim 1, wherein the thermoplastic resin pre-expanded particles are pressurized and held in a pressure tank at a pressure of 0.5 to 10 kg / cm 2 (G).
を0.5〜10kg/cm2(G)に加圧する特許請求の範囲第1
項記載の製造法。7. The thermoplastic resin pre-expanded particles are pressurized to 0.5 to 10 kg / cm 2 (G) in a measuring tank.
The manufacturing method described in the item.
粒子を元の発泡倍率の1.5〜7倍に発泡させる特許請求
の範囲第1項記載の製造法。8. The production method according to claim 1, wherein the thermoplastic resin pre-expanded particles having the foaming ability are expanded to 1.5 to 7 times the original expansion ratio.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60156323A JPH0645721B2 (en) | 1985-07-16 | 1985-07-16 | Method for producing pre-expanded thermoplastic resin particles |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60156323A JPH0645721B2 (en) | 1985-07-16 | 1985-07-16 | Method for producing pre-expanded thermoplastic resin particles |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6218438A JPS6218438A (en) | 1987-01-27 |
JPH0645721B2 true JPH0645721B2 (en) | 1994-06-15 |
Family
ID=15625278
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP60156323A Expired - Fee Related JPH0645721B2 (en) | 1985-07-16 | 1985-07-16 | Method for producing pre-expanded thermoplastic resin particles |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0645721B2 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2517105Y2 (en) * | 1991-09-04 | 1996-11-13 | 積水化成品工業株式会社 | Pot for plant cultivation of orchids |
DE4211972A1 (en) * | 1992-04-09 | 1993-10-14 | Huels Chemische Werke Ag | Process for the production of foam beads |
JP3950557B2 (en) * | 1998-07-30 | 2007-08-01 | 株式会社カネカ | Polypropylene-based resin pre-expanded particles and method for producing in-mold expanded molded articles therefrom |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5170264A (en) * | 1974-12-14 | 1976-06-17 | Asahi Dow Ltd | |
JPS51101072A (en) * | 1975-03-03 | 1976-09-07 | Asahi Dow Ltd | |
JPS5342789A (en) * | 1976-09-29 | 1978-04-18 | Toshiba Electric Equip | Flame detector |
-
1985
- 1985-07-16 JP JP60156323A patent/JPH0645721B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPS6218438A (en) | 1987-01-27 |
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