JPS6054175B2 - Continuous foam extrusion equipment - Google Patents

Continuous foam extrusion equipment

Info

Publication number
JPS6054175B2
JPS6054175B2 JP53145852A JP14585278A JPS6054175B2 JP S6054175 B2 JPS6054175 B2 JP S6054175B2 JP 53145852 A JP53145852 A JP 53145852A JP 14585278 A JP14585278 A JP 14585278A JP S6054175 B2 JPS6054175 B2 JP S6054175B2
Authority
JP
Japan
Prior art keywords
screw
notch
extrusion device
raw material
pitch
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
Application number
JP53145852A
Other languages
Japanese (ja)
Other versions
JPS5571534A (en
Inventor
健 新貝
隆 永井
洋 下山
禎仁 小堀
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sekisui Chemical Co Ltd
Original Assignee
Sekisui Chemical Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sekisui Chemical Co Ltd filed Critical Sekisui Chemical Co Ltd
Priority to JP53145852A priority Critical patent/JPS6054175B2/en
Publication of JPS5571534A publication Critical patent/JPS5571534A/en
Publication of JPS6054175B2 publication Critical patent/JPS6054175B2/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B29C44/3442—Mixing, kneading or conveying the foamable material
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/285—Feeding the extrusion material to the extruder
    • B29C48/29—Feeding the extrusion material to the extruder in liquid form
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/285—Feeding the extrusion material to the extruder
    • B29C48/298—Feeding the extrusion material to the extruder in a location other than through a barrel, e.g. through a screw
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B29C48/53—Screws having a varying channel depth, e.g. varying the diameter of the longitudinal screw trunk
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B29C48/565—Screws having projections other than the thread, e.g. pins
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B29C48/62—Screws characterised by the shape of the thread channel, e.g. U-shaped
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels

Description

【発明の詳細な説明】 本発明は発泡体を連続的に押出す装置に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for continuously extruding foam.

従来熱可塑性樹脂から発泡体を製造する装置は種々報告
されているが、発泡剤として炭酸ガス、窒素ガス、プロ
パン、ブタン等の気体を使用する際には気体を熱可塑性
樹脂中に均一に分散することが困難であり均一な発泡体
は得られにくかつた。Various devices have been reported for producing foams from thermoplastic resins, but when using gases such as carbon dioxide, nitrogen gas, propane, butane as blowing agents, it is necessary to uniformly disperse the gas in the thermoplastic resin. It was difficult to obtain a uniform foam.

本発明の目的は炭酸ガス、窒素ガス、プロパン、ブタン
等の気体を発泡剤として使用し連続的に発泡体を成型す
る装置を提供することにある。An object of the present invention is to provide an apparatus for continuously molding a foam using gas such as carbon dioxide, nitrogen gas, propane, butane, etc. as a foaming agent.

即ち本発明の要旨は原料供給口より吐出目側のシリンダ
ー又はスクリューに発泡剤注入口の設けられたスクリュ
ー式発泡体押出装置において前記発泡剤注入口付近より
吐出目側のスクリューフライトの一部が切り欠かれ、切
り欠き部より前記原料供給目測のスクリュー軸上に上記
切り欠き部に接近して突起物が設けられたことを特徴と
する発泡体の連続押出装置に存する。次に本発明の一例
を図面で説明する。That is, the gist of the present invention is that in a screw type foam extrusion device in which a blowing agent inlet is provided in a cylinder or screw on the side of the discharge eye from the raw material supply port, a part of the screw flight on the side of the discharge eye from the vicinity of the blowing agent inlet is The continuous extrusion device for foam is characterized in that a notch is provided, and a protrusion is provided on the screw shaft of the raw material supply target closer to the notch than the notch. Next, an example of the present invention will be explained with reference to the drawings.

第１図は本発明の押出装置の一例を示す部分断面図てあ
り、第２図は第１図における混練領域１”３のスクリュ
ー３の拡大図である。FIG. 1 is a partial sectional view showing an example of the extrusion apparatus of the present invention, and FIG. 2 is an enlarged view of the screw 3 in the kneading area 1''3 in FIG. 1.

図中１はシリンダーであり、シリンダー１には一端に原
料供給口６が設けられ、他端には押出機吐出口８を通じ
て金型９が設置され、中間には発泡剤注入口７が設けら
れている。In the figure, 1 is a cylinder, and the cylinder 1 is provided with a raw material supply port 6 at one end, a mold 9 is installed at the other end through an extruder discharge port 8, and a foaming agent injection port 7 is provided in the middle. ing.

２はスクリュー、であり、駆動装置５に連続されている
。2 is a screw, which is connected to a drive device 5.

スクリュー２には全長にわたつてスクリューフライト３
が設けられており、混練領域１３においてスクリューフ
ライト３に切り欠き部３１が設けられ、切り欠き部３１
より原料供給口６側のスクリュー軸上に突起物４が設け
られている。又スクリュー２は供給領域１０から第１圧
縮領域１１、第１計量化領域１２にかけて次第に太くな
つており、混練領域１３では再び細くなつている。そし
て混練領域１３は第２計量化領域１４に続いており、第
２計量化領域の先端即ちスクリューの先端は押出機吐出
口８の手前に設置されている。スクリューフライトに切
り欠き部３１が設けられる領域は混練領域１３の他、第
２計量化領域にも設けられて良いが、混練領域１３だけ
に設けられるのが好ましい。Screw flight 3 is attached to screw 2 over its entire length.
A notch 31 is provided in the screw flight 3 in the kneading region 13, and the notch 31 is provided in the screw flight 3 in the kneading region 13.
A protrusion 4 is provided on the screw shaft closer to the raw material supply port 6. Further, the screw 2 gradually becomes thicker from the supply region 10 to the first compression region 11 and the first metering region 12, and becomes thinner again in the kneading region 13. The kneading area 13 is continuous with the second metering area 14, and the tip of the second metering area, ie, the tip of the screw, is installed in front of the extruder outlet 8. The region where the notch 31 is provided in the screw flight may be provided not only in the kneading region 13 but also in the second metering region, but it is preferable that it is provided only in the kneading region 13.

切り欠き部３１の広さ、数は特に限定されるものではな
いが、広すぎると押出効率が低下するので１ピッチあた
りスクリューフライトの１ピッチあたりの外周長さの２
．０〜２５％切り欠かれるのが好ましく、又切り欠き部
３１の数は１ピッチあたり１〜１柵であるのが好ましい
。The width and number of the notches 31 are not particularly limited, but if they are too wide, the extrusion efficiency will decrease, so it should be
．． It is preferable that the notches are cut out by 0 to 25%, and the number of cutouts 31 is preferably 1 to 1 fence per pitch.

突起物４の形状、高さも特に限定されるものではなく、
円柱、角柱、台形、錐形等任意の形状が採用されてよく
、円柱が好適に使用され、高さはスクリューフライトの
高さより低く、スクリューフライトの高さの１／２以上
になされるのが好ましい。The shape and height of the protrusion 4 are not particularly limited either,
Any shape such as a cylinder, a prism, a trapezoid, or a cone may be adopted, and a cylinder is preferably used, and the height is lower than the height of the screw flight, and it is preferable that the height is 1/2 or more of the height of the screw flight. preferable.

又、突起物４の数は切り欠き部１個当り１，個あれは良
いが２個以上であつてもよい。突起物の位置は切り欠き
部より原料供給口６側であればよいが、切り欠き部から
１／１０ピッチ〜１／２ピッチの範囲に設けられるのが
好ましい。又第１図に示した押出装置は１段式装置であ
つ！て発泡剤注入口はシリンダーに設けられているが、
押出装置は２段式装置であつてもよく、発泡剤注入口は
スクリューに設けられてもよい。Further, the number of protrusions 4 may be one per notch, or two or more, although the number may be fine. The protrusions may be located closer to the raw material supply port 6 than the notch, but are preferably provided within a range of 1/10 pitch to 1/2 pitch from the notch. Also, the extrusion device shown in Figure 1 is a one-stage device! The blowing agent inlet is provided in the cylinder, but
The extrusion device may be a two-stage device and the blowing agent inlet may be provided on the screw.

次に第１図に示した押出装置で発泡体を製造する方法を
説明する。原料供給口６からポリエチレン、ポリプロピ
レン等の熱可塑性樹脂、滑剤、核剤等の原料を供給領域
１０に供給し、供給領域１０から第１圧縮領域１１．第
２計量化領域１２にかけて次第に圧縮され加熱溶融され
て混練領域１３に送られる。Next, a method for producing a foam using the extrusion apparatus shown in FIG. 1 will be explained. Raw materials such as thermoplastic resins such as polyethylene and polypropylene, lubricants, and nucleating agents are supplied from the raw material supply port 6 to the supply region 10, and from the supply region 10 to the first compression region 11. It is gradually compressed in the second metering zone 12, heated and melted, and sent to the kneading zone 13.

混グ練領域１３では圧縮が解放されると同時に発泡剤注
入口７から炭酸ガス、窒素ガス、プロパン、ブタン等の
発泡剤が注入され原料と発泡剤は混練される。次いて第
２計量化領域１４に送られ金型９から押出されて発泡体
が製造される。本発明の押出装置のスクリューは混合領
域において押出用のスクリューフライトに切り欠き部が
設けられ、切り欠き部の原料供給口側に突起物が設けら
れているので第２図におけるＡ方向に押出されている原
料の１部は切り欠き部からＢ方向に逆流し、突起物にぶ
つかつてＢ１及びＢ２方向に分割される。In the kneading region 13, at the same time as the compression is released, a blowing agent such as carbon dioxide gas, nitrogen gas, propane, butane, etc. is injected from the blowing agent injection port 7, and the raw materials and the blowing agent are kneaded. The foam is then sent to the second metering area 14 and extruded from the mold 9 to produce a foam. The screw of the extrusion device of the present invention has a notch in the screw flight for extrusion in the mixing region, and a protrusion is provided on the raw material supply port side of the notch, so that the screw is extruded in the direction A in Fig. 2. A part of the raw material flows backward from the notch in the B direction, collides with the protrusion, and is divided into the B1 and B2 directions.

そしてＢ１及びＢ２方向に分割された原料はＡ方向に押
出されている原料と合流して再び゛混練されるので原料
は均一に混練され、従つて発泡剤が炭酸ガス、窒素ガス
等の気体であつても均一な発泡体が得られるのである。
次に本発明を実施例により説明する。The raw materials separated in the B1 and B2 directions are combined with the raw materials extruded in the A direction and kneaded again, so the raw materials are uniformly kneaded and the blowing agent is a gas such as carbon dioxide or nitrogen gas. A uniform foam can be obtained.
Next, the present invention will be explained by examples.

実施例 スクリューの外径が６５ｍ．．Ｌ／Ｄが３２である第１
図に示した形状の押出機に、ポリエチレン（密度０．９
２４メルトインデックス２．０）１０踵量部及びタルク
０．５重量部を原料供給口６から供給し、発泡剤注入口
から炭酸ガスを注入圧５０ｋｇ／Ｃｌｔの条件で注入し
、１０ｋｇ／Ｈｒの条件で押出した。The outer diameter of the example screw is 65 m. ．． The first whose L/D is 32
Polyethylene (density 0.9
24 melt index 2.0) 10 parts by weight and 0.5 parts by weight of talc were supplied from the raw material supply port 6, and carbon dioxide gas was injected from the blowing agent injection port at an injection pressure of 50 kg/Clt. It was extruded under certain conditions.

なおスクリューフライトのピッチ数、溝の深さ及び各領
域の温度は第１表に示した。又切り欠き部は１ピッチあ
たり１個で巾は５ｗｎ１突起物は直径７．５７ｍ高さ３
７１７７！の円柱で切り欠き部との距離は１０ＴＩｒｆ
ｆ１、１ピッチは６５顛であつた。得られた発泡体は均
一に発泡しており、発泡倍率は１３刀倍であり、約８５
％が独立気泡であつた。The number of pitches of the screw flights, the depth of the grooves, and the temperature of each region are shown in Table 1. Also, there is one cutout per pitch, and the width is 5wn1.The protrusion is 7.57m in diameter and 3cm in height.
7177! The distance between the cylinder and the notch is 10TIrf.
f1, 1 pitch was 65 pieces. The obtained foam was foamed uniformly, and the foaming ratio was 13 times, about 85
% were closed cells.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は、本発明の押出装置の一例を示す部分断面図で
あり、第２図は混練領域のスクリューの拡大図である。FIG. 1 is a partial sectional view showing an example of an extrusion apparatus of the present invention, and FIG. 2 is an enlarged view of a screw in a kneading area.

Claims (1)

【特許請求の範囲】 １ 原料供給口より吐出口側のシリンダー又はスクリュ
ーに発泡剤注入口の設けられたスクリュー式発泡体押出
装置において、前記発泡剤注入口付近より吐出口側のス
クリューフライトの一部が切り欠かれ、切り欠き部より
前記原料供給口側のスクリュー軸上に上記切り欠き部に
接近して突起物が設けられたことを特徴とする発泡剤の
連続押出装置。 ２ 切り欠き部が混合領域において設けられた特許請求
の範囲第１項記載の押出装置。 ３ １ピッチあたりの切り欠き部の切り欠き長さが、ス
クリューフライトの１ピッチあたりの外周長さの２．０
〜２５％である特許請求の範囲第１項記載の押出装置。 ４ 切り欠き部の数が１ピッチ当り１〜１０個である特
許請求の範囲第１項記載の押出装置。５ 突起物が切り
欠き部の原料供給口側の１／１０ピッチ〜１／２ピッチ
の範囲に設けられた特許請求の範囲第１項記載の押出装
置。 ６ 突起物の高さがスクリューフライトの高さの１／２
〜１である特許請求の範囲第１項記載の押出装置。[Scope of Claims] 1. In a screw type foam extrusion device in which a blowing agent inlet is provided in a cylinder or screw on the side of the discharge port from the raw material supply port, one of the screw flights near the blowing agent inlet on the side of the discharge port. 1. A continuous extrusion device for a foaming agent, characterized in that a portion is cut out, and a protrusion is provided on the screw shaft on the side of the raw material supply port from the notch so as to be close to the notch. 2. The extrusion device according to claim 1, wherein the notch is provided in the mixing region. 3 The length of the notch per pitch is 2.0 of the outer circumference length of the screw flight per pitch.
25%. The extrusion device of claim 1. 4. The extrusion device according to claim 1, wherein the number of notches is 1 to 10 per pitch. 5. The extrusion device according to claim 1, wherein the protrusions are provided in a range of 1/10 pitch to 1/2 pitch on the raw material supply port side of the notch. 6 The height of the protrusion is 1/2 of the height of the screw flight
. . . 1. The extrusion device according to claim 1.
JP53145852A 1978-11-24 1978-11-24 Continuous foam extrusion equipment Expired JPS6054175B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53145852A JPS6054175B2 (en) 1978-11-24 1978-11-24 Continuous foam extrusion equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53145852A JPS6054175B2 (en) 1978-11-24 1978-11-24 Continuous foam extrusion equipment

Publications (2)

Publication Number Publication Date
JPS5571534A JPS5571534A (en) 1980-05-29
JPS6054175B2 true JPS6054175B2 (en) 1985-11-29

Family

ID=15394572

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53145852A Expired JPS6054175B2 (en) 1978-11-24 1978-11-24 Continuous foam extrusion equipment

Country Status (1)

Country Link
JP (1) JPS6054175B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS64350U (en) * 1987-06-19 1989-01-05
JPH0672262U (en) * 1993-03-19 1994-10-07 オータックス株式会社 Light emitting device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3469270B2 (en) * 1993-06-01 2003-11-25 三菱電線工業株式会社 Extruder
WO2023058525A1 (en) * 2021-10-04 2023-04-13 キョーラク株式会社 Resin for expansion molding, method for producing same, method for producing expansion molded body, and method for producing structure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS64350U (en) * 1987-06-19 1989-01-05
JPH0672262U (en) * 1993-03-19 1994-10-07 オータックス株式会社 Light emitting device

Also Published As

Publication number Publication date
JPS5571534A (en) 1980-05-29

Similar Documents

Publication Publication Date Title
US4247515A (en) Process for molding of plastic structural web articles
US4136220A (en) Process for the molding of plastic structural web and the resulting articles
US3956438A (en) Process for extruding a partially foamed thermoplastic product
US3857914A (en) Method for extruding a foamed, molded article
US3827841A (en) Extrusion apparatus for use in the production of thermoplastic resin foams
US3374300A (en) Process and apparatus for the continuous production of polystyrenic foam materials
US4431311A (en) Extrusion apparatus for the production of foamed synthetic material
JPH0615722A (en) Production of high-polymeric material object having foamable core in skin and device used for said method
US3632254A (en) Apparatus for producing fiber reinforced plastics
KR20050113642A (en) Granulation die, granulation apparatus and process for producing expandable thermoplastic resin granule
JPH03111433A (en) Manufacture of foam substance from thermoplastic synthesized substance and extruder therefor
JP3220592B2 (en) Method and apparatus for producing TPE-foam moldings for the building materials and automotive industries
EP1393879B1 (en) Forming device for thermoplastic resin formed part
JPS6054175B2 (en) Continuous foam extrusion equipment
US3830901A (en) Continuous process for extruding cellular thermoplastics
GB1018178A (en) Process and apparatus for the production of mouldings or extrusions having a cellular structure from thermoplastic synthetic materials
GB1152306A (en) Process and apparatus for Manufacturing Foamed Articles of Thermoplastic Materials
JPH05318511A (en) Manufacture of compression molded article
US4536357A (en) Method and apparatus for preparing multi-cellular foamed board of thermoplastic resin
JPS6054174B2 (en) Continuous foam extrusion equipment
JP3587717B2 (en) Method for producing extruded foam composite and foam composite
JPS6039245Y2 (en) Continuous foam extrusion equipment
JPS6125530B2 (en)
KR20010103638A (en) Molded Polymeric Material Including Microcellular, Injection-Molded, and low-Density Polymeric Material
JPH0631726A (en) Manufacture of foamable thermoplastic resin particles