JPS6219293B2 - - Google Patents
Info
- Publication number
- JPS6219293B2 JPS6219293B2 JP56020344A JP2034481A JPS6219293B2 JP S6219293 B2 JPS6219293 B2 JP S6219293B2 JP 56020344 A JP56020344 A JP 56020344A JP 2034481 A JP2034481 A JP 2034481A JP S6219293 B2 JPS6219293 B2 JP S6219293B2
- Authority
- JP
- Japan
- Prior art keywords
- injection
- heating medium
- hollow body
- stage
- particles
- 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
- 238000002347 injection Methods 0.000 claims description 90
- 239000007924 injection Substances 0.000 claims description 90
- 238000010438 heat treatment Methods 0.000 claims description 42
- 239000002245 particle Substances 0.000 claims description 30
- 230000004927 fusion Effects 0.000 claims description 21
- 229920005992 thermoplastic resin Polymers 0.000 claims description 17
- 239000006260 foam Substances 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 210000003491 skin Anatomy 0.000 claims 2
- 210000002615 epidermis Anatomy 0.000 claims 1
- 230000002123 temporal effect Effects 0.000 claims 1
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 230000002950 deficient Effects 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920005990 polystyrene resin Polymers 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 1
- 238000000071 blow moulding Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- BXOUVIIITJXIKB-UHFFFAOYSA-N ethene;styrene Chemical group C=C.C=CC1=CC=CC=C1 BXOUVIIITJXIKB-UHFFFAOYSA-N 0.000 description 1
- 229920001038 ethylene copolymer Polymers 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000001175 rotational moulding Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 238000003466 welding Methods 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/3415—Heating or cooling
- B29C44/3426—Heating by introducing steam in the mould
- B29C44/343—Heating by introducing steam in the mould by using pipes to direct the steam inside the mould
-
- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
- B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
- B29C44/18—Filling preformed cavities
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
- B29K2105/048—Expandable particles, beads or granules
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
Description
【発明の詳細な説明】
本発明は、表面を主として硬質の表皮で覆つた
熱可塑性樹脂発泡体の製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a thermoplastic resin foam whose surface is mainly covered with a hard skin.
熱可塑性樹脂発泡体の製品として、発泡体の弱
点を補ない用途に応じた耐久性を与えるためにそ
の表面を硬質樹脂等の表皮で覆つたものがある。 Some thermoplastic resin foam products have their surfaces covered with a skin such as a hard resin in order to provide durability suitable for the intended use without compensating for the weaknesses of the foam.
このような表皮を有する発泡体は、例えば、表
皮となる中空体を予め形成し、この中空体の内部
に発泡性熱可塑性樹脂粒子を充填しておいて加熱
媒体噴射管を挿入し、噴射管から水蒸気等の加熱
媒体を一定時間噴射して前記粒子を加熱し、各粒
子が互に融着する前に前記噴射管を中空体外へ抜
去して前記粒子を中空体内で融着一体化せしめる
方法により製造し得る。 Such a foam having a skin can be produced by, for example, forming a hollow body to serve as the skin in advance, filling the interior of this hollow body with expandable thermoplastic resin particles, and inserting a heating medium injection pipe into the injection pipe. A method in which the particles are heated by injecting a heating medium such as steam for a certain period of time from the hollow body, and before the particles are fused together, the injection tube is removed from the hollow body to fuse and integrate the particles within the hollow body. It can be manufactured by
しかして、上記の方法においては、中空体内に
水蒸気等の加熱媒体を噴射供給する噴射管として
中空体に挿入される部分に多数の同一径の噴射孔
を一定ピツチで有するものが一般に使用されてお
り、しかも加熱媒体が一定圧力で供給されて前記
噴射孔から一斉に噴射されるので、中空体内の充
填粒子は、噴射管に近いものから先に加熱されて
粒子間の融着が始まる結果、加熱媒体の流通が阻
害されて噴射管から遠い個所の加熱が充分に行な
われないで該部において部分的に融着不良が生じ
る欠点があつた。殊に噴射管先端側つまり中空体
内奥側ほど噴射管から離れた個所での融着不良が
生じ易いものであつた。 However, in the above method, a tube having a large number of injection holes of the same diameter at a constant pitch in the part inserted into the hollow body is generally used as an injection pipe for injecting a heating medium such as water vapor into the hollow body. Moreover, since the heating medium is supplied at a constant pressure and is injected all at once from the injection holes, the particles filled in the hollow body are heated first from those closest to the injection tube, and as a result, fusion between particles begins. This has the drawback that the flow of the heating medium is obstructed, and the portions far from the injection tube are not sufficiently heated, resulting in partial failure of fusion in these portions. In particular, defective fusion was more likely to occur at locations farther from the injection tube toward the tip end of the injection tube, that is, toward the innermost part of the hollow body.
噴射管を２本以上にすれば上記のような欠点を
ある程度改善できるのであるが、それでも融着不
良は皆無でなく決して満足のできるものではな
い。 Although the above-mentioned drawbacks can be improved to some extent by using two or more injection pipes, there is still no possibility of poor fusion and the result is by no means satisfactory.
また上記のような欠点をなくすために、噴射管
からの加熱媒体の噴射位置を２段階にわけ、先ず
噴射管の先端側から開始し、次に中空体挿入口側
に移行させる方法も考えられたが、この場合確か
に融着良好となるのであるが、前記挿入口側の噴
射の際には先に加熱された先端側の融着が進行す
る結果、噴射管との融着が進み、この噴射後の噴
射管の抜き出しが行ない難くなるおそれがある
上、装置が複雑になり、かつ操作が煩雑で、殆ん
ど実施されていないのが実情である。 In addition, in order to eliminate the above-mentioned drawbacks, it is also possible to divide the injection position of the heating medium from the injection pipe into two stages, first starting from the tip side of the injection pipe and then moving to the hollow body insertion port side. However, in this case, the fusion is certainly good, but when the injection port side is injected, the fusion progresses on the tip side, which is heated first, and as a result, the fusion with the injection tube progresses. In reality, this method is rarely practiced because it may become difficult to remove the injection tube after injection, the device is complicated, and the operation is complicated.
本発明者等は上記に鑑み種々研究を重ねた結
果、加熱媒体の噴射供給圧を時間的に調整するだ
けの簡単な操作でもつて、融着不良の生じない良
好な加熱を行なえることを知見し、本発明を完成
するに到つたものである。即ち本発明は、噴射管
からの加熱媒体噴射を２段階にわけ、噴射管近く
で融着を始めようとするまでの第１段階の噴射供
給の後、噴射管抜き出し寸前の第２段階では第１
段階よりやや高圧にして比較的短時間の噴射供給
を行なうことを特徴とするものである。 The inventors of the present invention have conducted various studies in view of the above, and have discovered that good heating without defective fusion can be achieved with a simple operation of temporally adjusting the injection supply pressure of the heating medium. However, the present invention has been completed. That is, the present invention divides the injection of heating medium from the injection pipe into two stages, and after the first stage of injection supply until fusion starts near the injection pipe, and the second stage when the injection pipe is just about to be pulled out. 1
It is characterized by a relatively short injection supply at a slightly higher pressure than the stage.
次に本発明の実施態様を、比較的大型のフロー
ト等を製造する場合を例にとり図面に基いて説明
する。 Next, embodiments of the present invention will be described with reference to the drawings, taking as an example a case where a relatively large float or the like is manufactured.
１は所定の形状に成形された表皮となる中空体
であり、ポリエチレンやポリプロピレン等のポリ
オレフイン系樹脂、ポリスチレン系樹脂、ポリ塩
化ビニル樹脂、ABS樹脂その他の合成樹脂を回
転成形、ブロー成形法等により通常２〜10mm程度
の厚みに成形してなり、例えば長さ１ｍ、直径
0.5ｍ前後の大きさの略たる形状に成形される。
この中空体１には発泡性熱可塑性樹脂粒子を充填
するための充填孔２が所要個所に設けられてい
る。この充填孔２の大きさは中空体１の大きさに
よつて異なるが、普通10〜30mm程度の直径のもの
が好適である。 1 is a hollow body that becomes a skin formed into a predetermined shape, and is made of polyolefin resin such as polyethylene or polypropylene, polystyrene resin, polyvinyl chloride resin, ABS resin, or other synthetic resin by rotational molding, blow molding, etc. It is usually molded to a thickness of about 2 to 10 mm, for example, 1 m in length and diameter.
It is molded into a barrel shape approximately 0.5m in size.
This hollow body 1 is provided with filling holes 2 at required locations for filling with expandable thermoplastic resin particles. The size of the filling hole 2 varies depending on the size of the hollow body 1, but a diameter of about 10 to 30 mm is usually suitable.
上記のように予め成形された中空体１内に充填
孔２から発泡性熱可塑性樹脂粒子３を充填する。
この発泡性熱可塑性樹脂粒子３としては、ポリス
チレン系樹脂、ポリエチレン系樹脂、スチレン−
無水マレイン酸共重合体、スチレン−エチレン共
重合体その他の熱可塑性樹脂の小粒子に適当な発
泡剤を加えたものが使用され、特に上記粒子３を
予め30〜60倍に発泡せしめたものが好適に使用さ
れる。 The hollow body 1 previously formed as described above is filled with expandable thermoplastic resin particles 3 through the filling hole 2 .
As the expandable thermoplastic resin particles 3, polystyrene resin, polyethylene resin, styrene resin, etc.
Small particles of maleic anhydride copolymer, styrene-ethylene copolymer, and other thermoplastic resins with an appropriate foaming agent added are used, and in particular, particles 3 that have been expanded 30 to 60 times in advance are used. Preferably used.
上記のごとく粒子３を充填しておいて、多数の
噴射孔４が穿設された加熱媒体噴射管５を上記充
填孔２を通して中空体１内に挿入する。従つて充
填孔２は噴射管５の挿入孔を兼ねる。また前記噴
射孔４は噴射管５の中空体１内への挿入部分の略
全長にわたつて図のように軸方向に10〜40mmの間
隔で四方に穿設されており、その孔の大きさは普
通直径0.5〜2.5mm程度である。 Filled with particles 3 as described above, the heating medium injection pipe 5 having a large number of injection holes 4 is inserted into the hollow body 1 through the filling hole 2 . Therefore, the filling hole 2 also serves as an insertion hole for the injection pipe 5. In addition, the injection holes 4 are bored in all directions at intervals of 10 to 40 mm in the axial direction over approximately the entire length of the insertion part of the injection pipe 5 into the hollow body 1, and the size of the holes is is usually about 0.5 to 2.5 mm in diameter.
そして噴射管５を中空体１に挿入した状態で、
発泡性熱可塑性樹脂粒子３を加熱するための加熱
媒体として加熱空気、水蒸気等（特に水蒸気が好
適）を噴射管５に供給して各噴射孔４から四方に
分散噴射し、この熱によつて中空体１内に充填さ
れた発泡性熱可塑性樹脂粒子３を該粒子の軟化点
以上の温度に加熱して軟化・発泡せしめる。 Then, with the injection pipe 5 inserted into the hollow body 1,
Heated air, steam, etc. (particularly steam is preferred) is supplied to the injection pipe 5 as a heating medium for heating the expandable thermoplastic resin particles 3, and is dispersed and injected in all directions from each injection hole 4. The expandable thermoplastic resin particles 3 filled in the hollow body 1 are heated to a temperature equal to or higher than the softening point of the particles to soften and foam them.
しかして本発明においては、上記水蒸気等の加
熱媒体の噴射に際し、その噴射供給圧を時間的に
２段階に制御調整して、第１段階のやや低圧、噴
射管近くで融着を始めようとするまでの時間の噴
射供給の後、噴射管抜き出し寸前の第２段階では
第１段階よりやや高圧にして比較的短時間の噴射
供給を行なうもので、その各段階での噴射供給圧
および噴射時間等は製造せんとする発泡体の大き
さ等によつて異なるが、例えば長さ１ｍ、直径
0.5ｍ前後の大きさの場合、第１段階の噴射は0.3
〜0.6Kg／cm2（ゲージ圧）の噴射供給圧で35〜45
秒間行ない、第２段階では0.6〜0.8Kg／cm2（ゲー
ジ圧）の噴射供給圧で５〜15秒間の噴射を行な
う。こうして加熱媒体の噴射を２段階に分けて行
なうことにより中空体１内の粒子３を加熱する。 However, in the present invention, when injecting the heating medium such as steam, the injection supply pressure is temporally controlled and adjusted in two stages, and fusion is started at a slightly lower pressure in the first stage, near the injection pipe. In the second stage, just before the injection tube is pulled out, the pressure is slightly higher than in the first stage, and the injection is supplied for a relatively short time.The injection supply pressure and injection time at each stage are as follows: etc. will vary depending on the size of the foam to be manufactured, but for example, 1 m in length and 1 m in diameter.
If the size is around 0.5m, the first stage injection will be 0.3
35-45 at injection supply pressure of ~0.6Kg/ cm2 (gauge pressure)
In the second stage, injection is performed for 5 to 15 seconds at an injection supply pressure of 0.6 to 0.8 Kg/cm 2 (gauge pressure). In this way, the particles 3 within the hollow body 1 are heated by performing the injection of the heating medium in two stages.
そして上記加熱終了後、未だ充填各粒子３が融
着していない間に直ちに噴射管５を中空体１から
抜去し、前記加熱の余熱で各粒子間同士を融着一
体化せしめ、その後冷却して充填孔２を中空体１
と同質の材料で融着閉塞する。 After the above-mentioned heating is completed, the injection tube 5 is immediately removed from the hollow body 1 while the filled particles 3 are not yet fused, and the residual heat from the heating is used to fuse the particles together, and then the particles are cooled. Filling hole 2 with hollow body 1
It is fused and occluded with a material of the same quality.
以上のような加熱媒体の２段階の噴射供給を行
なうと、例えば0.3〜0.6Kg／cm2（ゲージ圧）の噴
射供給圧に保持される噴射開始からの第１段階の
噴射の間、発泡性熱可塑性樹脂粒子３が未だ融着
していないため、加熱媒体である水蒸気等が粒子
３の間を円滑に流通し得て、噴射管５に近い個所
の粒子が加熱されるはもちろん、噴射管５から遠
い個所の粒子も万遍に加熱される。この加熱が約
35〜45秒経過し第１段階の噴射終了間際になる
と、噴射管５を中心とした加熱媒体噴射による加
熱であるために、中空体１内の粒子３は噴射管５
に近い個所から先ず軟化し融着を始めようとする
が、本発明ではここで（例えば35〜45秒経過後）
噴射供給圧を例えば0.6〜0.8Kg／cm2（ゲージ圧）
に上げて加熱媒体噴射を５〜15秒間続行（第２段
階）するので、加熱媒体は先のときよりも勢いよ
く噴射されて融着を始めつつある部分を突破して
噴射管５から遠い部分にまで充分に流通し、該部
分での加熱が不足なく行なわれ、また内部の空気
や放熱して温度の下つた水蒸気等が充填孔２から
円滑に流出し、中空体内部での加熱媒体の流通が
最後まで良好に行なわれることになる。従つて各
粒子３が全体的に一様に加熱融着され、融着不良
の生じない各粒子３が完全に融着一体化した表皮
を有する熱可塑性樹脂発泡体製品を得ることがで
きる。 When the two-stage injection supply of the heating medium is performed as described above, for example, during the first stage injection from the start of injection, which is maintained at an injection supply pressure of 0.3 to 0.6 Kg/cm 2 (gauge pressure), foaming Since the thermoplastic resin particles 3 are not yet fused, water vapor, etc., which is a heating medium, can flow smoothly between the particles 3, and not only the particles near the injection pipe 5 are heated, but also the injection pipe Particles located far from 5 are also heated evenly. This heating is approximately
When 35 to 45 seconds have passed and the first stage of injection is about to end, the particles 3 in the hollow body 1 are heated by the injection of heating medium centered on the injection pipe 5.
The area closest to the area first softens and tries to start fusion, but in the present invention, the area close to the area softens and begins to fuse.
Injection supply pressure, e.g. 0.6 to 0.8Kg/cm 2 (gauge pressure)
The heating medium is injected for 5 to 15 seconds (second stage), so the heating medium is injected more forcefully than before, breaking through the part that is starting to fuse and spraying the part far from the injection pipe 5. The air inside the hollow body and the water vapor whose temperature has dropped due to heat dissipation smoothly flow out from the filling hole 2, and the heating medium inside the hollow body is heated properly. Distribution will be carried out smoothly until the end. Therefore, it is possible to obtain a thermoplastic resin foam product having a skin in which each of the particles 3 is completely fused and integrated without causing any defective fusion, since the particles 3 are uniformly heat-fused as a whole.
なお、加熱媒体の噴射供給を行なう手段として
は、中空体１の直径や大きさによつて異なるが、
第１図の実施例のように２本あるいはそれ以上の
加熱媒体噴射管５を中空体１に対し並列的に挿入
して、それぞれの噴射管５について上記したよう
な２段階加熱を行なうのが望ましく、加熱効果お
よび粒子間の融着が一層良好となる。この場合噴
射管５の挿入孔ともなる充填孔２を複数個所に設
けておく。もちろん１本の噴射管５をもつて第２
図のごとく上記加熱を実施することもできる。ま
た中空体１の長さが大きい場合には第３図のよう
に充填孔２を中空体１の両端部に設けてそれぞれ
に噴射管５を挿入して上記加熱を実施することも
できる。 Note that the means for jetting and supplying the heating medium varies depending on the diameter and size of the hollow body 1;
As in the embodiment shown in FIG. 1, two or more heating medium injection pipes 5 are inserted into the hollow body 1 in parallel, and each injection pipe 5 is heated in two stages as described above. Desirably, the heating effect and interparticle fusion are better. In this case, filling holes 2, which also serve as insertion holes for injection pipes 5, are provided at a plurality of locations. Of course, the second
The above heating can also be carried out as shown in the figure. Further, when the length of the hollow body 1 is large, the heating can be carried out by providing filling holes 2 at both ends of the hollow body 1 and inserting injection pipes 5 into each end as shown in FIG.
以上のように本発明は、噴射管からの加熱媒体
噴射を、噴射終了時点の少し前から噴射管に近い
部分等で融着が始まる点を考慮して、略その時点
までの間の第１段階の噴射とその後の第２段階と
で噴射供給圧を調整して異にし、融着が始まる後
の第２段階の噴射ではそれまでより若干圧力を高
くして行なうので、噴射管に近い部分で融着しつ
つある部分を突き破るようにしてその融着を防
ぎ、噴射管から遠い部分や中空体内奥側に最後ま
で充分に流通でき、この噴射管から遠い部分への
加熱媒体流通が阻害されて該部分で加熱不足、融
着不良が生じたりするのを確実に防止することが
できる。しかも前記第２段階の噴射が噴射管抜き
出し寸前の比較的短時間の間に行なわれるため、
噴射管に対する融着が進むまでに噴射管を難なく
容易に抜き出すことができる。 As described above, in the present invention, the heating medium is injected from the injection pipe in consideration of the fact that fusion starts at a portion near the injection pipe a little before the end of the injection, and the heating medium is The injection supply pressure is adjusted and made different between the first stage injection and the subsequent second stage, and in the second stage injection after fusion starts, the pressure is slightly higher than before, so the part near the injection pipe This prevents the welding by breaking through the part that is being fused, allowing sufficient flow to the part far from the injection pipe and the inner part of the hollow body, and preventing the heating medium from flowing to the part far from the injection pipe. Therefore, it is possible to reliably prevent insufficient heating and poor fusion from occurring in the portion. Moreover, since the second stage of injection is performed in a relatively short period of time just before the injection tube is pulled out,
The injection tube can be easily pulled out without difficulty before the fusion to the injection tube progresses.
従つて本発明は、噴射供給圧を調整するだけの
簡単な操作でもつて中空体内部の全体に確実に加
熱媒体を噴射供給し得て、全体的に均一良好に加
熱融着でき、融着不良の生じない表皮を有する熱
可塑性樹脂発泡体を容易に製造できる。中でも比
較的大きい発泡体製品、例えばダム等の浮遊物防
止網用のフロートやいけす用フロート等の大型フ
ロート、面積の大きい建材その他の表皮を有する
大型発泡体製品を製造するのに特に好適であり、
発泡融着状態の良好な良品質の製品を容易に製
造、提供できる。 Therefore, the present invention makes it possible to reliably inject and supply the heating medium to the entire inside of the hollow body by simply adjusting the injection supply pressure, and to achieve uniform and good heat fusion throughout the body, thereby eliminating defects in fusion. It is possible to easily produce a thermoplastic resin foam having a skin that does not produce any of the following. Among them, it is particularly suitable for producing relatively large foam products, such as floats for floating object prevention nets in dams, large floats such as floats for fish tanks, and large foam products having a skin such as building materials with a large area. ,
It is possible to easily manufacture and provide high-quality products with good foaming and fusion bonding.
第１図は本発明の１実施態様を示す加熱媒体噴
射時の縦断面図、第２図および第３図はそれぞれ
別の実施例を示す加熱媒体噴射時の縦断面図であ
る。
１……中空体、３……発泡性熱可塑性樹脂粒
子、４……噴射孔、５……噴射管。
FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention when heating medium is injected, and FIGS. 2 and 3 are longitudinal sectional views showing different embodiments when heating medium is injected. DESCRIPTION OF SYMBOLS 1... Hollow body, 3... Expandable thermoplastic resin particles, 4... Injection hole, 5... Injection pipe.
Claims (1)
泡性熱可塑性樹脂粒子を充填しておいて加熱媒体
噴射管を挿入し、この噴射管から加熱媒体を前記
粒子を軟化点以上の温度に加熱した後、前記噴射
管を中空体外へ抜去した状態で前記充填粒子を融
着一体化せしめるに際し、前記噴射管からの加熱
媒体噴射はその噴射供給圧を時間的に２段階に調
整して行ない、噴射管近くで融着を始めようとす
るまでの第１段階の噴射供給の後、噴射管抜き出
し寸前の第２段階では第１段階よりやや高圧にし
て比較的短時間の噴射供給を行なうことを特徴と
する表皮を有する熱可塑性樹脂発泡体の製造方
法。 ２ 加熱媒体噴射は第１段階を0.3〜0.6Kg／cm2
（ゲージ圧）の噴射供給圧で35〜45秒間、第２段
階を0.6〜0.8Kg／cm2（ケージ圧）の噴射供給圧で
５〜15秒間とする特許請求の範囲第１項記載の表
皮を有する熱可塑性樹脂発泡体の製造方法。 ３ ２本以上の加熱媒体噴射管を中空体に挿入し
て加熱媒体噴射を行なう特許請求の範囲第１項ま
たは第２項記載の表皮を有する熱可塑性樹脂発泡
体の製造方法。[Claims] 1. A hollow body pre-formed into a predetermined shape is filled with expandable thermoplastic resin particles, a heating medium injection pipe is inserted, and the heating medium is applied from the injection pipe to soften the particles. After heating the injection tube to a temperature higher than the point, when the injection tube is removed from the hollow body and the filled particles are fused and integrated, the injection supply pressure of the heating medium is injected from the injection tube in two temporal stages. After the first stage of injection supply until fusion starts near the injection pipe, in the second stage just before the injection pipe is pulled out, the pressure is slightly higher than that of the first stage, and the pressure is applied for a relatively short period of time. A method for producing a thermoplastic resin foam having a skin, the method comprising supplying by injection. 2 The first stage of heating medium injection is 0.3 to 0.6Kg/cm 2
The epidermis according to claim 1, wherein the second stage is for 5 to 15 seconds at an injection supply pressure of 0.6 to 0.8 Kg/cm 2 (cage pressure). A method for producing a thermoplastic resin foam having the following. 3. A method for producing a thermoplastic resin foam having a skin according to claim 1 or 2, wherein two or more heating medium injection pipes are inserted into a hollow body to perform heating medium injection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56020344A JPS57135125A (en) | 1981-02-13 | 1981-02-13 | Manufacture for thermoplastic foamed product with outer layer of skin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56020344A JPS57135125A (en) | 1981-02-13 | 1981-02-13 | Manufacture for thermoplastic foamed product with outer layer of skin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57135125A JPS57135125A (en) | 1982-08-20 |
| JPS6219293B2 true JPS6219293B2 (en) | 1987-04-27 |
Family
ID=12024513
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56020344A Granted JPS57135125A (en) | 1981-02-13 | 1981-02-13 | Manufacture for thermoplastic foamed product with outer layer of skin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57135125A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000210967A (en) * | 1999-01-26 | 2000-08-02 | Jsp Corp | Manufacture of foamed molding with skin and foamed molding with skin |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5912544B2 (en) * | 2012-01-11 | 2016-04-27 | 株式会社ジェイエスピー | Method for producing foamed article with skin |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5092968A (en) * | 1973-12-24 | 1975-07-24 | ||
| JPS536371A (en) * | 1976-07-08 | 1978-01-20 | Kunio Iida | Process for manufacture of molded resin foam |
| JPS55137929A (en) * | 1979-04-16 | 1980-10-28 | Toyo Kikai Kinzoku Kk | Method of molding thick foamable styrol molded product |
-
1981
- 1981-02-13 JP JP56020344A patent/JPS57135125A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5092968A (en) * | 1973-12-24 | 1975-07-24 | ||
| JPS536371A (en) * | 1976-07-08 | 1978-01-20 | Kunio Iida | Process for manufacture of molded resin foam |
| JPS55137929A (en) * | 1979-04-16 | 1980-10-28 | Toyo Kikai Kinzoku Kk | Method of molding thick foamable styrol molded product |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000210967A (en) * | 1999-01-26 | 2000-08-02 | Jsp Corp | Manufacture of foamed molding with skin and foamed molding with skin |
| JP4503720B2 (en) * | 1999-01-26 | 2010-07-14 | 株式会社ジェイエスピー | Method for producing foamed article with skin |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57135125A (en) | 1982-08-20 |
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