JPH0371255B2 - - Google Patents
Info
- Publication number
- JPH0371255B2 JPH0371255B2 JP58229124A JP22912483A JPH0371255B2 JP H0371255 B2 JPH0371255 B2 JP H0371255B2 JP 58229124 A JP58229124 A JP 58229124A JP 22912483 A JP22912483 A JP 22912483A JP H0371255 B2 JPH0371255 B2 JP H0371255B2
- Authority
- JP
- Japan
- Prior art keywords
- thermoplastic resin
- foam
- blowing agent
- sheet
- volatile blowing
- 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 - Lifetime
Links
- 239000006260 foam Substances 0.000 claims description 31
- 229920005992 thermoplastic resin Polymers 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 19
- 239000004604 Blowing Agent Substances 0.000 claims description 18
- 238000004804 winding Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000004898 kneading Methods 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 229920005672 polyolefin resin Polymers 0.000 claims 1
- 239000007789 gas Substances 0.000 description 12
- 238000005187 foaming Methods 0.000 description 7
- 229920001577 copolymer Polymers 0.000 description 5
- -1 polypropylene Polymers 0.000 description 5
- 239000004743 Polypropylene Substances 0.000 description 4
- 229920001155 polypropylene Polymers 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 3
- 229920000098 polyolefin Polymers 0.000 description 3
- 239000004338 Dichlorodifluoromethane Substances 0.000 description 2
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 2
- 239000005977 Ethylene Substances 0.000 description 2
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 description 2
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- PXBRQCKWGAHEHS-UHFFFAOYSA-N dichlorodifluoromethane Chemical compound FC(F)(Cl)Cl PXBRQCKWGAHEHS-UHFFFAOYSA-N 0.000 description 2
- 235000019404 dichlorodifluoromethane Nutrition 0.000 description 2
- 239000004088 foaming agent Substances 0.000 description 2
- ZSIAUFGUXNUGDI-UHFFFAOYSA-N hexan-1-ol Chemical compound CCCCCCO ZSIAUFGUXNUGDI-UHFFFAOYSA-N 0.000 description 2
- CRSOQBOWXPBRES-UHFFFAOYSA-N neopentane Chemical compound CC(C)(C)C CRSOQBOWXPBRES-UHFFFAOYSA-N 0.000 description 2
- 239000002667 nucleating agent Substances 0.000 description 2
- 239000000454 talc Substances 0.000 description 2
- 229910052623 talc Inorganic materials 0.000 description 2
- CYRMSUTZVYGINF-UHFFFAOYSA-N trichlorofluoromethane Chemical compound FC(Cl)(Cl)Cl CYRMSUTZVYGINF-UHFFFAOYSA-N 0.000 description 2
- 229940029284 trichlorofluoromethane Drugs 0.000 description 2
- BOSAWIQFTJIYIS-UHFFFAOYSA-N 1,1,1-trichloro-2,2,2-trifluoroethane Chemical compound FC(F)(F)C(Cl)(Cl)Cl BOSAWIQFTJIYIS-UHFFFAOYSA-N 0.000 description 1
- FRCHKSNAZZFGCA-UHFFFAOYSA-N 1,1-dichloro-1-fluoroethane Chemical compound CC(F)(Cl)Cl FRCHKSNAZZFGCA-UHFFFAOYSA-N 0.000 description 1
- DDMOUSALMHHKOS-UHFFFAOYSA-N 1,2-dichloro-1,1,2,2-tetrafluoroethane Chemical compound FC(F)(Cl)C(F)(F)Cl DDMOUSALMHHKOS-UHFFFAOYSA-N 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- XOBKSJJDNFUZPF-UHFFFAOYSA-N Methoxyethane Chemical compound CCOC XOBKSJJDNFUZPF-UHFFFAOYSA-N 0.000 description 1
- 229930182556 Polyacetal Natural products 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Natural products C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical group ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- UMNKXPULIDJLSU-UHFFFAOYSA-N dichlorofluoromethane Chemical compound FC(Cl)Cl UMNKXPULIDJLSU-UHFFFAOYSA-N 0.000 description 1
- 229940099364 dichlorofluoromethane Drugs 0.000 description 1
- 229940087091 dichlorotetrafluoroethane Drugs 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 150000008282 halocarbons Chemical class 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000004611 light stabiliser Substances 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 125000003011 styrenyl group Chemical group [H]\C(*)=C(/[H])C1=C([H])C([H])=C([H])C([H])=C1[H] 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000004711 α-olefin Substances 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
- B29C44/36—Feeding the material to be shaped
- B29C44/46—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length
- B29C44/50—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length using pressure difference, e.g. by extrusion or by spraying
- B29C44/505—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length using pressure difference, e.g. by extrusion or by spraying extruding the compound through a flat die
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2007/00—Flat articles, e.g. films or sheets
Landscapes
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Molding Of Porous Articles (AREA)
Description
【発明の詳細な説明】
本発明は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 of manufacturing a thermoplastic resin foam.
熱可塑性樹脂発泡体の製造方法として、熱可塑
性樹脂と揮発性発泡剤とを加工下に溶融混練した
後、ダイより大気中に押出して発泡体シートを得
ることが従来より行なわれている。 A conventional method for producing a thermoplastic resin foam is to melt and knead a thermoplastic resin and a volatile blowing agent during processing, and then extrude the resulting foam sheet through a die into the atmosphere.
しかしながら、このようにして得られた熱可塑
性樹脂発泡体シートはダイより押出して発泡膨張
させた後、気泡内の発泡剤ガスが大気中に急激に
逃散して気泡が収縮するという欠点がある。この
ような現象は、特発泡倍率が50倍を越える高発泡
倍率の発泡体の場合に顕著であり、気泡体積が
１／３〜１／４に収縮することが経験されてい
る。 However, the thermoplastic resin foam sheet obtained in this manner has a drawback that after extrusion through a die and foaming and expansion, the blowing agent gas in the cells rapidly escapes into the atmosphere, causing the cells to shrink. Such a phenomenon is remarkable in the case of a foam with a high expansion ratio of more than 50 times, and it has been experienced that the cell volume shrinks to 1/3 to 1/4.
したがつて、このように気泡が収縮した発泡体
は室温下で５日間以上養生することによつて再膨
張させることが行なわれている。ところが、この
方法によつて再膨張させるためには、発泡体シー
トを通常の巻き取り方法によつて巻きることが出
来ない。それ故、高発泡倍率の発泡体を連続的に
製造することが非常に困難であつた。 Therefore, foams whose cells have contracted in this manner are allowed to re-expand by curing at room temperature for 5 days or more. However, in order to be re-expanded by this method, the foam sheet cannot be rolled up using conventional winding methods. Therefore, it has been extremely difficult to continuously produce foams with a high expansion ratio.
これらの問題点を解決する方法としてシート
に間隙を設けて巻き取り養生する方法（特公昭47
−41711号など）、収縮した発泡体シートを非常
溶媒性の揮発性熱可塑化流体で処理した後、非透
過性の膨張剤浴に浸漬し、次いで加熱処理するこ
とにより再膨張を短時間で行なう方法（特公昭45
−39473号）、発泡体シートを大気圧以下の減圧
域のもとで樹脂の化点以下の温度に冷却固化する
方法（特公昭55−2186号）などが提案されてい
る。 To solve these problems, there is a method of creating gaps in the sheet and rolling it up and curing it (Special Publications Publication No. 47).
-41711), the shrunken foam sheet is treated with a highly solvent volatile thermoplasticizing fluid, immersed in an impermeable swelling agent bath, and then heat treated for rapid re-expansion. How to do it (Tokuko 1977)
39473), and a method in which a foam sheet is cooled and solidified at a temperature below the resin's solidification point in a reduced pressure region below atmospheric pressure (Japanese Patent Publication No. 55-2186).
しかしながら、上記の方法は間隙を設けて巻
き取る方法、すなわち緩巻きする方法を具体化す
るための手段が複雑であり、工業化が困難なもの
である。また、の方法は多数の処理工程を付加
するため実用性に劣ると共に、作業環境の悪化に
加えて処理時間が長くなるという欠点がある。さ
らに、の方法では比較的高発泡倍率の発泡体、
たとえば発泡倍率が30倍以上のポリオレフイン、
特にポリプロピレン系樹脂発泡体には適用できな
いという欠点がある。 However, in the above method, the method for winding with a gap, that is, the means for realizing the loose winding method is complicated, and industrialization is difficult. In addition, method (2) requires a large number of processing steps, which makes it less practical, and has the drawbacks of deteriorating the working environment and lengthening the processing time. In addition, the method produces foams with relatively high expansion ratios,
For example, polyolefin with a foaming ratio of 30 times or more,
In particular, it has the disadvantage that it cannot be applied to polypropylene resin foams.
本発明の目的は、上記のような欠点の解消され
た、連続化が容易な熱可塑性樹脂発泡体の製造方
法を提供することである。 An object of the present invention is to provide a method for producing a thermoplastic resin foam that is easy to continuous and that eliminates the above-mentioned drawbacks.
本発明は、熱可塑性樹脂と揮発性発泡剤とを加
圧下に溶融混練した後、該揮発性発泡剤のガス雰
囲気下にある帯域へ押出して製膜、発泡せしめ、
該ガス雰囲気下で巻き取ることを特徴とする熱可
塑性樹脂発泡体の製造方法である。 The present invention involves melting and kneading a thermoplastic resin and a volatile foaming agent under pressure, and then extruding the volatile foaming agent into a zone under a gas atmosphere to form a film and foam it.
This is a method for producing a thermoplastic resin foam, characterized by winding it up in the gas atmosphere.
本発明に用いる熱可塑性樹脂としては、通常発
泡体を製造するために用いられる熱可塑性樹脂で
あれば特に制限なく使用することができる。具体
的にはポリオレフイン（例えば高密度ポリエチレ
ン、低密度ポリエチレン、ポリプロピレン等のほ
かオレフインを主成分とする共重合体、例えばエ
チレンと炭素数３〜12のα−オレフインとの共重
合体、エチレンと酢酸ビニルとの共重合体等）；
ポリスチレン、スチレンを主成分とする共重合体
（例えばAS樹脂、ABS樹脂等）；ポリ塩化ビニ
ル、塩化ビニルを主成分とする共重合体；ポリア
ミド；ポリエステル；ポリアセタール；ポリカー
ボネート；アクリル樹脂等があり、これらの中で
はポリオレフイン、特にポリプロピレン系樹脂が
好適である。 As the thermoplastic resin used in the present invention, any thermoplastic resin that is normally used for producing foams can be used without particular limitation. Specifically, in addition to polyolefins (e.g., high-density polyethylene, low-density polyethylene, polypropylene, etc.), copolymers mainly composed of olefins, such as copolymers of ethylene and α-olefin having 3 to 12 carbon atoms, ethylene and acetic acid, etc. copolymers with vinyl, etc.);
Polystyrene, copolymers whose main component is styrene (e.g. AS resin, ABS resin, etc.); polyvinyl chloride, copolymers whose main component is vinyl chloride; polyamide; polyester; polyacetal; polycarbonate; acrylic resin, etc. Among these, polyolefins, particularly polypropylene resins, are preferred.
次に、本発明において揮発性発泡剤とは、上記
熱可塑性樹脂と加圧下に混合して均一な溶液とな
り得る発泡体を意味し、具体的にはプロパン、ブ
タン、ペンタン、ネオペンタン、ヘキサなどの脂
肪族炭化水素；ジクロロモノフルオロメタン、ジ
クロロジフルオロメタン、ジクロロモノフルオロ
エタン、ジクロロテトラフルオロエタン、トリク
ロロモノフルオロメタン、トリクロロトリフルオ
ロエタン、塩化メチレンなどのハロゲン化炭化水
素；メタノール、エタノール、プロパノール、ブ
タノール、ヘキサノールなどのアルコール類；ジ
メチルエーテル、メチルエチルエーテル、ジエチ
ルエーテルなどのエーテル類；酢酸エチル、アク
リル酸メチルなどのエステル類；水ならびにこれ
らの混合物などが挙げられる。 Next, in the present invention, a volatile blowing agent means a foam that can be mixed with the above thermoplastic resin under pressure to form a uniform solution, and specifically includes propane, butane, pentane, neopentane, hexa, etc. Aliphatic hydrocarbons; halogenated hydrocarbons such as dichloromonofluoromethane, dichlorodifluoromethane, dichloromonofluoroethane, dichlorotetrafluoroethane, trichloromonofluoromethane, trichlorotrifluoroethane, methylene chloride; methanol, ethanol, propanol, butanol , alcohols such as hexanol; ethers such as dimethyl ether, methyl ethyl ether, and diethyl ether; esters such as ethyl acetate and methyl acrylate; water and mixtures thereof.
さらに、上記成分のほかタルク等の無機粉末を
核剤として加えたり、顔料、光安定剤、熱安定
剤、難燃剤、重金属安定剤などを適宜添加するこ
とができる。 Furthermore, in addition to the above components, inorganic powder such as talc may be added as a nucleating agent, pigments, light stabilizers, heat stabilizers, flame retardants, heavy metal stabilizers, etc. may be added as appropriate.
本発明の方法においては、まず上記各成分を加
圧下に溶融混練するが、好ましくは押出成形機等
の成形機を用いて熱可塑性樹脂を加熱溶融し、次
いでこれに揮発性発泡剤を加え加圧下に混合して
均一な状態とする。熱可塑性樹脂と揮発性発泡剤
の混合割合は、目的とする発泡体の発泡倍率等の
要因を考慮して適宜決定すればよいが、通常は熱
可塑性樹脂100重量部に対して揮発性発泡剤５〜
200重量部、好ましくは７〜150重量部である。 In the method of the present invention, the above-mentioned components are first melted and kneaded under pressure. Preferably, the thermoplastic resin is heated and melted using a molding machine such as an extrusion molding machine, and then a volatile blowing agent is added thereto and the mixture is heated and kneaded. Mix under pressure until homogeneous. The mixing ratio of the thermoplastic resin and the volatile blowing agent may be determined as appropriate by considering factors such as the expansion ratio of the desired foam, but usually the volatile blowing agent is mixed with 100 parts by weight of the thermoplastic resin. 5～
200 parts by weight, preferably 7 to 150 parts by weight.
このようにして得られる揮発性発泡剤含有溶融
熱可塑性樹脂をダイより該揮発性発泡剤のガス雰
囲気下にある帯域へ押出して製膜、発泡せしめ
る。ここで揮発性発泡剤のガス雰囲気下にある帯
域は密閉室もしくは半密閉室とし、この帯域にお
ける揮発性発泡剤ガス濃度は50vol％以上である
ことが好ましく、70vol％以上がより好ましい。
揮発性発泡剤としてフレオンなどのフツ化炭化水
素類を用いた場合、これらのガスは空気より重い
ため、分離が容易であり、作業性にすぐれてい
る。次いで、製膜、発泡させた熱可塑性樹脂発泡
体シートを発泡体ガス雰囲気下で巻き取るが、こ
の場合に気泡内の発泡剤ガスは未だ逃散していな
いため、特別な設備と方法を用いて緩巻きとする
必要がなく、通常の操作で連続的に行なうことが
できる。 The thus obtained molten thermoplastic resin containing a volatile blowing agent is extruded from a die into a zone under a gas atmosphere of the volatile blowing agent to form a film and foam. Here, the zone under the volatile blowing agent gas atmosphere is a closed or semi-closed chamber, and the volatile blowing agent gas concentration in this zone is preferably 50 vol% or more, more preferably 70 vol% or more.
When fluorinated hydrocarbons such as freon are used as volatile blowing agents, these gases are heavier than air, so they are easy to separate and have excellent workability. Next, the thermoplastic resin foam sheet that has been formed into a film and foamed is rolled up in a foam gas atmosphere, but in this case, the blowing agent gas in the cells has not yet escaped, so special equipment and methods are used. There is no need to wind it loosely, and it can be done continuously with normal operations.
このようにして巻き取つた熱可塑性樹脂発泡体
シートを室外に取出し、大気中に曝らすと、発泡
剤ガスの一部が逃散して収縮するため、緩巻き状
となる。しかし、これを常法により養生せしめる
ことにより再膨張して正常なロール巻き状態に回
復する。 When the thermoplastic resin foam sheet thus wound is taken out of the room and exposed to the atmosphere, a portion of the blowing agent gas escapes and contracts, resulting in a loosely wound shape. However, by curing it in a conventional manner, it expands again and returns to its normal rolled state.
本発明の方法によれば、低発泡倍率のものから
50〜150倍程度の高発泡倍率の発泡体シートまで
通常の巻き取り方法を適用することができる。し
たがつて、巻き取りにあたつて緩巻き法のように
特別な設備や特殊な方法を必要としない。しか
も、巻取つた発泡体シートの巻き戻しや二次処理
が不要である。また、得られる発泡体シートは表
面平滑性にすぐれると共に外観が良好である。さ
らに、本発明の方法によれば発泡体シートの連続
製造が可能であり、かつ運転が容易であるため、
良質の製品を安価に製造することができる。した
がつて、本発明の方法は包装材料、断熱材料、緩
衝材料などとして用いられる熱可塑性樹脂発泡体
の製造に有効に利用することができる。 According to the method of the present invention, from low foaming ratio to
The usual winding method can be applied to foam sheets with a high expansion ratio of about 50 to 150 times. Therefore, unlike the loose winding method, no special equipment or special method is required for winding. Moreover, there is no need for unwinding or secondary treatment of the wound foam sheet. Moreover, the obtained foam sheet has excellent surface smoothness and good appearance. Furthermore, according to the method of the present invention, continuous production of foam sheets is possible and operation is easy;
High quality products can be manufactured at low cost. Therefore, the method of the present invention can be effectively used for producing thermoplastic resin foams used as packaging materials, heat insulating materials, cushioning materials, and the like.
次に、本発明を実施例により説明する。 Next, the present invention will be explained by examples.
実施例
ポリプロピレン（密度0.91g／cm3、メルトイン
デツクス0.6g／10分）100重量部に対し核剤とし
てタルク0.2重量部を加え、これを押出成形を用
いて200℃で溶融混練し、押出機の途中でトリク
ロロモノフルオロメタン100重量部およびジクロ
ロジフルオロメタン25重量部を150Kg／cm2で圧入
して十分に混練しつつ125℃まで冷却して均一な
溶液とした。次いで、この溶液をサーキユラダイ
（ダイ径30mmφ）より約70容量％の該揮発性発泡
剤ガスを含む雰囲気中に押出して発泡、シート化
した後、僅かに張力をかけて巻き取つた。Example 0.2 parts by weight of talc was added as a nucleating agent to 100 parts by weight of polypropylene (density 0.91 g/cm 3 , melt index 0.6 g/10 minutes), and this was melt-kneaded at 200°C using extrusion molding and extruded. In the middle of the machine, 100 parts by weight of trichloromonofluoromethane and 25 parts by weight of dichlorodifluoromethane were introduced under pressure at 150 kg/cm 2 and thoroughly kneaded while cooling to 125° C. to form a uniform solution. Next, this solution was extruded through a circular die (die diameter: 30 mmφ) into an atmosphere containing about 70% by volume of the volatile blowing agent gas, foamed, and formed into a sheet, which was then wound up under slight tension.
このようにして製造した発泡体シートを大気中
に取出すと、２時間後には激しく収縮し、発泡倍
率は約35倍まで低下し、巻き取りシート間に空隙
が生じて、いわゆる緩巻き状となつた。しかし、
これをさらに放置して養生を行なうと、再膨張が
起こり１日後には巻き取り時と同じ荷姿に戻り、
ロール径方向の発泡倍率は約100倍で、シート厚
みもほぼ均一で外観良好な製品が得られた。 When the foam sheet produced in this way is taken out into the atmosphere, it shrinks violently after 2 hours, the foaming ratio drops to about 35 times, and voids are created between the rolled sheets, resulting in a so-called loosely rolled shape. Ta. but,
If you leave it for a while to cure it, it will expand again and after a day it will return to the same packaging as when it was rolled up.
The foaming ratio in the radial direction of the roll was about 100 times, the sheet thickness was almost uniform, and a product with a good appearance was obtained.
比較例
実施例において、溶液を揮発性発泡剤発泡剤ガ
ス雰囲気中に押出す代りに大気中に押出したこと
以外は実施例に準じて行なつた。Comparative Example The procedure of the Example was followed, except that instead of extruding the solution into a volatile blowing agent blowing agent gas atmosphere, the solution was extruded into the atmosphere.
得られた発泡体シートは巻き取り段階ですでに
収縮しているため、巻き取りシート間にほとんど
空を生ぜず、また３日間放置して養生を行なつて
も、シート最外層を除き再膨張はほとんど行なわ
れず、内層シートの発泡倍率およびシート厚みは
いずれも最外層シートの１／２以下であつた。ま
た、発泡倍率は約30倍であり、実用に供し得ない
ものであつた。 Since the obtained foam sheet has already shrunk during the winding stage, there is hardly any space between the rolled sheets, and even if the sheet is left to cure for 3 days, the sheet will not re-expand except for the outermost layer. The foaming ratio and sheet thickness of the inner layer sheet were both 1/2 or less of that of the outermost layer sheet. Further, the foaming ratio was about 30 times, which made it impossible to put it into practical use.
Claims (1)
融混練した後、該揮発性発泡剤のガス雰囲気下に
ある帯域へ押出して製膜、発泡せしめ、該ガス雰
囲気下で巻き取ることを特徴とする熱可塑性樹脂
発泡体の製造方法。 ２ 熱可塑性樹脂がポリオレフイン系樹脂である
特許請求の範囲第１項記載の方法。[Claims] 1. After melting and kneading a thermoplastic resin and a volatile blowing agent under pressure, the volatile blowing agent is extruded into a zone under a gas atmosphere to form a film and foam, and under the gas atmosphere. A method for producing a thermoplastic resin foam, characterized by winding it up. 2. The method according to claim 1, wherein the thermoplastic resin is a polyolefin resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58229124A JPS60122131A (en) | 1983-12-06 | 1983-12-06 | Manufacture of thermoplastic resin foamed body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58229124A JPS60122131A (en) | 1983-12-06 | 1983-12-06 | Manufacture of thermoplastic resin foamed body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60122131A JPS60122131A (en) | 1985-06-29 |
| JPH0371255B2 true JPH0371255B2 (en) | 1991-11-12 |
Family
ID=16887121
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58229124A Granted JPS60122131A (en) | 1983-12-06 | 1983-12-06 | Manufacture of thermoplastic resin foamed body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60122131A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5059376A (en) * | 1989-04-20 | 1991-10-22 | Astro-Valcour, Incorporated | Methods for rapid purging of blowing agents from foamed polymer products |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50122569A (en) * | 1974-03-13 | 1975-09-26 |
-
1983
- 1983-12-06 JP JP58229124A patent/JPS60122131A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50122569A (en) * | 1974-03-13 | 1975-09-26 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60122131A (en) | 1985-06-29 |
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