JPH07299832A - Production of polyolefinic resin foamed sheet - Google Patents
Production of polyolefinic resin foamed sheetInfo
- Publication number
- JPH07299832A JPH07299832A JP6094814A JP9481494A JPH07299832A JP H07299832 A JPH07299832 A JP H07299832A JP 6094814 A JP6094814 A JP 6094814A JP 9481494 A JP9481494 A JP 9481494A JP H07299832 A JPH07299832 A JP H07299832A
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- pair
- foamed sheet
- cooling
- foamed
- 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.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 15
- 229920005989 resin Polymers 0.000 title abstract description 22
- 239000011347 resin Substances 0.000 title abstract description 22
- 238000001816 cooling Methods 0.000 claims abstract description 35
- 238000005187 foaming Methods 0.000 claims abstract description 27
- 239000004088 foaming agent Substances 0.000 claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 229920005672 polyolefin resin Polymers 0.000 claims description 32
- 239000006260 foam Substances 0.000 claims description 29
- 238000003825 pressing Methods 0.000 claims description 22
- 238000002844 melting Methods 0.000 claims description 19
- 230000008018 melting Effects 0.000 claims description 19
- 238000004132 cross linking Methods 0.000 claims description 10
- 238000003851 corona treatment Methods 0.000 abstract description 13
- 238000004381 surface treatment Methods 0.000 abstract description 5
- 238000010894 electron beam technology Methods 0.000 abstract description 4
- 230000037303 wrinkles Effects 0.000 description 6
- 150000001451 organic peroxides Chemical class 0.000 description 5
- 230000005865 ionizing radiation Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000002826 coolant Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- MYRTYDVEIRVNKP-UHFFFAOYSA-N 1,2-Divinylbenzene Chemical compound C=CC1=CC=CC=C1C=C MYRTYDVEIRVNKP-UHFFFAOYSA-N 0.000 description 2
- 239000004156 Azodicarbonamide Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical compound NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 description 2
- 235000019399 azodicarbonamide Nutrition 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 229920001684 low density polyethylene Polymers 0.000 description 2
- 239000004702 low-density polyethylene Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 description 1
- MWRWFPQBGSZWNV-UHFFFAOYSA-N Dinitrosopentamethylenetetramine Chemical compound C1N2CN(N=O)CN1CN(N=O)C2 MWRWFPQBGSZWNV-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- OKKRPWIIYQTPQF-UHFFFAOYSA-N Trimethylolpropane trimethacrylate Chemical compound CC(=C)C(=O)OCC(CC)(COC(=O)C(C)=C)COC(=O)C(C)=C OKKRPWIIYQTPQF-UHFFFAOYSA-N 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- VRFNYSYURHAPFL-UHFFFAOYSA-N [(4-methylphenyl)sulfonylamino]urea Chemical compound CC1=CC=C(S(=O)(=O)NNC(N)=O)C=C1 VRFNYSYURHAPFL-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229920006026 co-polymeric resin Polymers 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 229920000092 linear low density polyethylene Polymers 0.000 description 1
- 239000004707 linear low-density polyethylene Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、厚みのばらつきが小
さいポリオレフィン系樹脂発泡シートの製造方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a polyolefin resin foam sheet having a small thickness variation.
【０００２】[0002]
【従来の技術】発泡剤を含有するポリオレフィン系樹脂
発泡性シートを架橋させ加熱発泡させさせた後冷却し
て、ポリオレフィン系樹脂発泡シートを製造する方法
は、広く知られている（例えば、特公昭４２−１８８３
２号公報及び特開昭６３−３０９４３１号公報参照）。2. Description of the Related Art A method for producing a polyolefin-based resin foam sheet by crosslinking a polyolefin-based resin foamable sheet containing a foaming agent, heating and foaming it, and then cooling it is widely known (for example, Japanese Patent Publication No. 42-1883
2 and JP-A-63-309431).
【０００３】[0003]
【発明が解決しようとする課題】ところが、従来技術で
得られる熱可塑性樹脂発泡シートは、厚みのばらつきが
大きく、厚みのばらつきが小さい発泡シートを得るのが
困難である。発泡シートの厚みのばらつきは、発泡前の
発泡性シートの厚みのばらつきや成形歪みに左右される
が、発泡性シートの厚みのばらつきや成形歪みを調整す
るには限界がある。However, the thermoplastic resin foam sheet obtained by the conventional technique has a large variation in thickness, and it is difficult to obtain a foam sheet having a small variation in thickness. The variation in the thickness of the foamed sheet depends on the variation in the thickness of the foamable sheet before foaming and the molding distortion, but there is a limit in adjusting the variation in the thickness of the foamable sheet and the molding distortion.
【０００４】この発明は、上記の問題を解決するもの
で、第１の目的は、厚みのばらつきが小さいポリオレフ
ィン系樹脂発泡シートの製造方法を提供することにあ
る。また、第２の目的は、厚みのばらつきが小さく、且
つコロナ放電処理等の表面処理性の良好なポリオレフィ
ン系樹脂発泡シートの製造方法を提供することにある。The present invention solves the above problems, and a first object of the present invention is to provide a method for producing a polyolefin resin foam sheet having a small thickness variation. A second object of the present invention is to provide a method for producing a polyolefin resin foam sheet having a small thickness variation and good surface treatment such as corona discharge treatment.
【０００５】[0005]
【課題を解決するための手段】上記第１の目的は、発泡
剤を含有するポリオレフィン系樹脂発泡性シートを架橋
させ加熱発泡させた後冷却して、ポリオレフィン系樹脂
発泡シートを製造する方法において、発泡後の発泡シー
トを上記樹脂の（融点−２０℃）〜（融点＋５℃）の温
度に加熱された一対の押圧ピンチロールにより押圧し、
その後冷却することにより達成することができる。Means for Solving the Problems The first object is to provide a method for producing a polyolefin resin foam sheet by crosslinking a polyolefin resin foam sheet containing a foaming agent, heat-foaming it, and then cooling it. The foamed sheet after foaming is pressed by a pair of pressing pinch rolls heated to a temperature of (melting point −20 ° C.) to (melting point + 5 ° C.) of the resin,
It can be achieved by subsequent cooling.
【０００６】また、上記第２の目的は、発泡剤を含有す
るポリオレフィン系樹脂発泡性シートを架橋させ加熱発
泡させた後冷却して、ポリオレフィン系樹脂発泡シート
を製造する方法において、発泡後の発泡シートを上記樹
脂の（融点−２０℃）〜（融点＋５℃）の温度に加熱さ
れた一対の押圧ピンチロールにより押圧し、その後少な
くとも５℃／秒の冷却速度で急冷することにより達成す
ることができる。A second object of the present invention is to provide a method for producing a polyolefin resin foam sheet by crosslinking a polyolefin resin foam sheet containing a foaming agent, heat-foaming it, and then cooling it. This can be achieved by pressing the sheet with a pair of pressing pinch rolls heated to a temperature of (melting point −20 ° C.) to (melting point + 5 ° C.) of the resin, and then rapidly cooling at a cooling rate of at least 5 ° C./second. it can.
【０００７】この発明において、ポリオレフィン系樹脂
としては、低密度ポリエチレン樹脂、直鎖状低密度ポリ
エチレン、高密度ポリエチレン、ポリプピロピレン樹
脂、エチレン−プロピレン共重合樹脂、エチレン−酢酸
ビニル共重合樹脂など発泡シートの製造に用いられてい
る公知のポリオレフィン系樹脂が使用される。これ等の
樹脂は単独で用いてもよく、二種以上を混合して用いて
もよい。In the present invention, the polyolefin resin is a foamed sheet such as low density polyethylene resin, linear low density polyethylene, high density polyethylene, polypropylene resin, ethylene-propylene copolymer resin, ethylene-vinyl acetate copolymer resin. A known polyolefin resin used in the production is used. These resins may be used alone or in combination of two or more.
【０００８】発泡剤としては、一般にアゾジカルボンア
ミドやＮ，Ｎ' −ジニトロソペンタメチレンテトラミ
ン、ｐ−トルエンスルホニルセミカルバジド等の熱分解
型発泡剤が用いられる。これ等の発泡剤の含有量は、得
ようとする発泡シートの発泡倍率に応じて適宜決定され
る。発泡倍率は５〜４０倍が好ましく、一般にポリオレ
フィン系樹脂１００重量部に対して、熱分解型発泡剤２
〜２０重量部程度が含有される。As the foaming agent, a pyrolytic foaming agent such as azodicarbonamide, N, N'-dinitrosopentamethylenetetramine or p-toluenesulfonyl semicarbazide is generally used. The content of these foaming agents is appropriately determined according to the expansion ratio of the foam sheet to be obtained. The expansion ratio is preferably 5 to 40 times, and generally 100 parts by weight of the polyolefin-based resin is added to the thermal decomposition type foaming agent 2
Approximately 20 parts by weight is contained.
【０００９】発泡剤を含有するポリオレフィン系樹脂発
泡性シートは、例えば、上記ポリオレフィン系樹脂に適
量の熱分解型発泡剤を混合し、これを押出機やロール等
の汎用の混練装置を用いて発泡剤が分解しない温度で溶
融混練し、シート状に成形することにより得ることがで
きる。The polyolefin resin foamable sheet containing a foaming agent is obtained by, for example, mixing the above polyolefin resin with an appropriate amount of a pyrolytic foaming agent, and foaming the mixture using a general-purpose kneading device such as an extruder or a roll. It can be obtained by melt-kneading at a temperature at which the agent does not decompose and molding into a sheet.
【００１０】そして、上記発泡性シートは、発泡性を向
上させるために、電離性放射線又は有機機過酸化物によ
り架橋される。電離性放射線により発泡性シートを架橋
させるには、上記発泡性シートに電子線等の電離性放射
線を線量で１〜３０Ｍｒａｄ程度照射し、それにより発
泡性シートを構成する樹脂を架橋させる。The foamable sheet is cross-linked with ionizing radiation or organic peroxide in order to improve foamability. In order to crosslink the foamable sheet with ionizing radiation, the foamable sheet is irradiated with ionizing radiation such as an electron beam at a dose of about 1 to 30 Mrad, thereby crosslinking the resin forming the foamable sheet.
【００１１】また、有機機過酸化物により発泡性シート
を架橋させるには、上記方法で発泡性シートの発泡剤と
ともにジクミルパーオキサイド等の有機機過酸化物を混
合しておき、これを熱分解型発泡剤及び有機過酸化物が
分解しない温度で溶融混練してシート状に成形し、これ
を加熱して有機過酸化物を分解し、それにより発泡性シ
ートを構成する樹脂を架橋させる。In order to crosslink the foamable sheet with the organic peroxide, the organic peroxide such as dicumyl peroxide is mixed with the foaming agent of the foamable sheet by the above-mentioned method, and this is heated. The decomposition-type foaming agent and the organic peroxide are melt-kneaded at a temperature at which they are not decomposed to form a sheet, and this is heated to decompose the organic peroxide, thereby cross-linking the resin constituting the foamable sheet.
【００１２】なお、ポリオレフィン系樹脂に発泡剤を混
合する際には、必要に応じて、トリメチロールプロパン
トリメタクリレート、ジビニルベンゼン等の多官能性モ
ノマーからなる架橋助剤、酸化亜鉛等の発泡促進剤、酸
化防止剤、熱安定剤、着色剤、帯電防止剤、難燃性剤、
気泡核形成剤、その他の公知の添加剤を配合することが
できる。When the foaming agent is mixed with the polyolefin resin, if necessary, a crosslinking aid composed of a polyfunctional monomer such as trimethylolpropane trimethacrylate or divinylbenzene, a foaming accelerator such as zinc oxide, etc. , Antioxidant, heat stabilizer, colorant, antistatic agent, flame retardant,
A cell nucleating agent and other known additives can be added.
【００１３】こうして得られる発泡剤を含有するポリオ
レフィン系樹脂発泡性シートを用いて、発泡シートを製
造する方法について、以下に、図面を参照しながら説明
する。A method for producing a foamed sheet using the polyolefin resin foamable sheet containing the foaming agent thus obtained will be described below with reference to the drawings.
【００１４】図１は、この発明の一実施態様を説明する
ための側面図である。先ず、ポリオレフィン系樹脂に熱
分解型発泡剤を適量混合し、これを例えば押出機により
溶融混合し、シート状に成形して、発泡剤を含有するポ
リオレフィン系樹脂発泡性シートを得る。そして、この
発泡性シートに、例えば電子線等の電離性放射線を適量
照射して樹脂を架橋させ、発泡性シート１を調製する。FIG. 1 is a side view for explaining one embodiment of the present invention. First, an appropriate amount of a pyrolytic foaming agent is mixed with a polyolefin-based resin, which is melt-mixed with, for example, an extruder and molded into a sheet to obtain a foaming sheet of a polyolefin-based resin containing a foaming agent. Then, the foamable sheet 1 is prepared by irradiating an appropriate amount of ionizing radiation such as an electron beam to crosslink the resin.
【００１５】次ぎに、上記架橋させた発泡性シート１
は、一対の送出しロール４により細隙通路３から加熱発
泡炉２内へ垂直に移送される。そして、加熱発泡炉２内
の遠赤外線ヒーター５と熱風により予熱され、引き続い
て遠赤外線ヒーター６と熱風導入具９とを備えた熱風吹
付け装置７からの熱風により発泡適温に加熱される。な
お、熱風は熱風排出管１０より排出される。Next, the crosslinkable foamable sheet 1 described above.
Are vertically transferred from the slit passage 3 into the heating and foaming furnace 2 by a pair of delivery rolls 4. Then, it is preheated by the far-infrared heater 5 and hot air in the heating and foaming furnace 2, and is subsequently heated to a proper temperature by the hot air from the hot-air blowing device 7 including the far-infrared heater 6 and the hot-air introducing tool 9. The hot air is discharged from the hot air discharge pipe 10.
【００１６】発泡適温に加熱された発泡性シート１は、
発泡剤の分解ガスにより所望の倍率に発泡し、発泡シー
ト１' として細隙通路１１から加熱発泡炉２外へ移送さ
れる。この場合、発泡シート１' には発泡による波状の
しわが発生するので、しわ取り装置１２により発泡シー
ト１' の両端部を横方向に引っ張られてしわが除去され
る。The foamable sheet 1 heated to a proper foaming temperature is
The decomposition gas of the foaming agent causes the foaming to a desired ratio, and the foamed sheet 1'is transferred from the slit passage 11 to the outside of the heating foaming furnace 2. In this case, since wavy wrinkles are generated in the foam sheet 1'by foaming, both ends of the foam sheet 1'are laterally pulled by the wrinkle removing device 12 to remove the wrinkles.
【００１７】その後、発泡シート１' は、上記樹脂の
（融点−２０℃）〜（融点＋５℃）の温度に加熱された
一対の押圧ロール１３の間隙に移送されて押圧される。
一対の押圧ロール１３の温度が上記樹脂の（融点−２０
℃）よりも低い場合は、発泡シートの厚みのばらつきを
小さくする作用が小さく、逆に上記樹脂の（融点＋５
℃）よりも高い場合は、発泡シートの表面が荒れ肌とな
って、外観が悪くなる。Thereafter, the foamed sheet 1'is transferred to and pressed by the pair of pressing rolls 13 heated to a temperature of (melting point -20 ° C) to (melting point + 5 ° C) of the resin.
The temperature of the pair of pressing rolls 13 is (melting point −20 of the above resin).
If it is lower than (° C.), the effect of reducing the variation in the thickness of the foamed sheet is small, and conversely (melting point + 5
C.), the surface of the foamed sheet becomes rough and the appearance becomes poor.
【００１８】このような観点から、一対の押圧ロール１
３の加熱温度は、特に、上記樹脂の（融点−１５℃）〜
（融点）の温度が好ましく、上記樹脂の（融点−１０
℃）〜（融点）の温度がさらに好ましい。From such a viewpoint, the pair of pressing rolls 1
The heating temperature of 3 is, in particular, from (melting point −15 ° C.) to
The (melting point) temperature is preferable, and the (melting point-10
C.) to (melting point) are more preferred.
【００１９】また、一対の押圧ロール１３の間隙は、加
熱発泡後の発泡シート１' の厚みのばらつきを考慮して
適当な間隙に設定される。この間隙は、一般に、加熱発
泡後の発泡シート１' の厚みの８０〜８５％程度に設定
するのが好ましい。一対の押圧ロール１３の間隙が小さ
くなりすぎると、発泡シート１' の表面近くの気泡が潰
れてしまい、逆に間隙が逆に間隙が大きすぎると、発泡
シートの厚みのばらつきを小さくする作用がなくなる。The gap between the pair of pressing rolls 13 is set to an appropriate gap in consideration of the variation in the thickness of the foamed sheet 1'after heat foaming. Generally, this gap is preferably set to about 80 to 85% of the thickness of the foamed sheet 1'after heat foaming. If the gap between the pair of pressing rolls 13 becomes too small, the air bubbles near the surface of the foamed sheet 1 ′ will be crushed. Conversely, if the gap is too large, the effect of reducing the variation in the thickness of the foamed sheet will be small. Disappear.
【００２０】一対の押圧ロール１３の表面は、一般に、
クロームメッキ等による鏡面とされるが、発泡シート
１' がロール表面に付着しやすい場合は、フッ素樹脂を
コーティングしたもの或いはセラミック等の剥離性の良
好な材質が用いられる。なお、上記発泡シート１' を、
より確実に押圧するために、上記一対の押圧ロール１３
の後に、これと同様な別の一対の押圧ロールを一組以上
増設してもよい。The surfaces of the pair of pressure rolls 13 are generally
Although it is mirror-finished by chrome plating or the like, if the foamed sheet 1'is likely to adhere to the roll surface, a material having good releasability such as one coated with fluororesin or ceramic is used. In addition, the foam sheet 1'is
In order to press more reliably, the pair of pressing rolls 13
After this, one or more pairs of another pair of pressing rolls similar to this may be added.
【００２１】このようして押圧された発泡シート１'
は、引き続いて一対の冷却ロール１４の間隙に移送され
て冷却され、こうして発泡シート１' の厚みが固定され
る。この冷却は、強制的に冷却されることなく自然冷却
で充分であるが、特に、少なくとも５℃／秒の冷却速度
で急冷すると、発泡シート１' の厚みが短時間に固定さ
れ、しかも発泡シート１' を構成する樹脂の結晶化が阻
止されて、コロナ放電処理等の表面処理性の良好な発泡
シートが得られる。The foamed sheet 1'pressed in this way
Is subsequently transferred to the gap between the pair of cooling rolls 14 and cooled, and thus the thickness of the foam sheet 1'is fixed. Natural cooling is sufficient for this cooling without being forcibly cooled, but in particular, when the material is rapidly cooled at a cooling rate of at least 5 ° C./sec, the thickness of the foamed sheet 1 ′ is fixed in a short time, and the foamed sheet 1 ′ is fixed. Crystallization of the resin constituting 1'is prevented, and a foamed sheet having good surface treatment properties such as corona discharge treatment can be obtained.
【００２２】冷却速度が５℃／秒よりも低い場合は、コ
ロナ放電処理等の表面処理性を向上させる作用は期待で
きない。特に、コロナ放電処理等の表面処理性を向上さ
せるには、少なくとも２０℃／秒の冷却速度で急冷する
のが好ましく、少なくとも５０℃／秒の冷却速度で急冷
するのがさらに好ましい。If the cooling rate is lower than 5 ° C./second, the effect of improving the surface treatment property such as corona discharge treatment cannot be expected. In particular, in order to improve surface treatability such as corona discharge treatment, it is preferable to perform rapid cooling at a cooling rate of at least 20 ° C./second, more preferably at least 50 ° C./second.
【００２３】上記発泡シート１' を冷却するには、一般
に、冷却水等の冷媒が循環されている一対の冷却ロール
１４の表面に接触させて行われるが、これと同様な別の
一対の冷却ロールを一組以上増設して冷却してもよい。
また、冷却水やアルコール等の冷媒を噴霧する方法やこ
れ等の冷媒に浸漬する方法で冷却してもよい。Cooling of the foamed sheet 1'is generally carried out by contacting the surface of a pair of cooling rolls 14 in which a coolant such as cooling water is circulated, but another pair of cooling similar to this is performed. One or more rolls may be added for cooling.
Alternatively, cooling may be performed by spraying a coolant such as cooling water or alcohol, or by immersing in a coolant such as these.
【００２４】こうして冷却された発泡シートは、一対の
引取りロール１５により引き取られ、一般に、巻取機
（図は省略）によりロール状に巻き取られ、発泡シート
の製品とされる。The foamed sheet thus cooled is taken up by a pair of take-up rolls 15 and generally wound into a roll by a winder (not shown) to obtain a foamed sheet product.
【００２５】[0025]
【作用】発泡剤を含有するポリオレフィン系樹脂発泡性
シートを架橋させ加熱発泡させた後冷却して、ポリオレ
フィン系樹脂発泡シートを製造する方法において、発泡
後の発泡シートを上記樹脂の（融点−２０℃）〜（融点
＋５℃）の温度に加熱された一対の押圧ロールにより押
圧すると、架橋発泡後の発泡シートは加熱により変形し
やすくなっており、しかも樹脂が架橋していることによ
り無架橋のものに比べ粘弾性も高くなっており、それに
より、厚みの厚い部分は極端な変形を伴うことなく一対
の押圧ロールにより適度に圧縮され、全体として厚みが
均一になる。In the method for producing a polyolefin resin foam sheet by crosslinking a polyolefin resin foam sheet containing a foaming agent, heating and foaming the foamed sheet, the foamed sheet after foaming has a melting point of -20 (° C) to (melting point + 5 ° C) is pressed by a pair of pressing rolls, the foamed sheet after cross-linking and foaming is easily deformed by heating, and moreover, the resin is cross-linked so that it does not cross-link. The viscoelasticity is also higher than that of the one, so that the thick portion is appropriately compressed by the pair of pressing rolls without causing extreme deformation, and the thickness becomes uniform as a whole.
【００２６】その後、上記のように押圧された発泡シー
トが冷却されると、全体の厚みが均一となった状態で固
定される。この場合、特に、押圧された発泡シートが少
なくとも５℃／秒の冷却速度で急冷されると、発泡シー
トは全体の厚みが均一となった状態で速やかに固定さ
れ、全体として厚みがより一層均一になる。しかも、ポ
リオレフィン系樹脂の結晶化が阻止され、コロナ放電処
理等の表面処理性が向上する。After that, when the foamed sheet pressed as described above is cooled, it is fixed in a state where the entire thickness is uniform. In this case, in particular, when the pressed foamed sheet is rapidly cooled at a cooling rate of at least 5 ° C./sec, the foamed sheet is quickly fixed in a state where the entire thickness becomes uniform, and the overall thickness is more uniform. become. Moreover, the crystallization of the polyolefin resin is prevented, and the surface treatability such as corona discharge treatment is improved.
【００２７】[0027]
【実施例】以下、この発明の実施例及び比較例を示す。実施例１ 低密度ポリエチレン樹脂（融点：１１０℃、ＭＩ：４．
５、密度：０．９２４ｇ／cm3 ）１００重量部に、発泡
剤としてアゾジカルボンアミド６重量部を混合し、この
混合物を押出機を用いて１３０℃の温度で溶融混練しシ
ート状に押出成形し、厚さ０．４mmの発泡性シートを得
た。この発泡性シートに電子線を２．２Ｍｒａｄ照射し
て樹脂を架橋させ、架橋した発泡性シート１を得た。EXAMPLES Examples and comparative examples of the present invention will be shown below. Example 1 Low-density polyethylene resin (melting point: 110 ° C., MI: 4.
5. Density: 0.924 g / cm 3 ) 100 parts by weight was mixed with 6 parts by weight of azodicarbonamide as a foaming agent, and this mixture was melt-kneaded at a temperature of 130 ° C. using an extruder and extruded into a sheet. Then, a foamable sheet having a thickness of 0.4 mm was obtained. This foamable sheet was irradiated with an electron beam at 2.2 Mrad to crosslink the resin to obtain a crosslinked foamable sheet 1.
【００２８】この架橋した発泡性シート１を、１２ｍ／
分の速度で、図１に示すように、２１０℃に加熱された
加熱発泡炉２内に垂直に移送しながら加熱して発泡さ
せ、しわ取り装置１２により発泡シート１' のしわを除
去する。ここで、発泡シート１' の厚みは１．０mmで、
発泡倍率は約１０倍、発泡シートの表面温度は１００℃
であった。This crosslinked foamable sheet 1 was
As shown in FIG. 1, at a speed of a minute, as it is vertically transferred into a heating and foaming furnace 2 heated to 210 ° C., it is heated and foamed, and a wrinkle removing device 12 removes wrinkles from the foamed sheet 1 ′. Here, the thickness of the foam sheet 1'is 1.0 mm,
Expansion ratio is about 10 times, surface temperature of foam sheet is 100 ℃
Met.
【００２９】その後、上記発泡シート１' を、表面温度
を１１０℃に調節した一対の押圧ロール１３（表面ハー
ドクロムメッキ、ロール間隙０．８５mm）の間隙に通し
て押圧し、引き続いて、表面温度を１０℃に調節した一
対の冷却ロール１４の間隙に通し、この冷却ロール１４
の表面に抱かせるように接触させながら移送して、発泡
シート１' を強制的に１０℃まで急冷し、一対の引取り
ロール１５を経て、巻取機（図は省略）により巻き取っ
て、製品幅１００cmの発泡シートを製造した。なお、上
記発泡シート１' の冷却速度は約３０℃／秒であった。Thereafter, the foamed sheet 1'is pressed through the gap between a pair of pressing rolls 13 (surface hard chrome plating, roll gap 0.85 mm) whose surface temperature is adjusted to 110 ° C., and subsequently the surface temperature is reached. Through a gap between a pair of cooling rolls 14 adjusted to 10 ° C.
The foamed sheet 1 ′ is forcibly cooled to 10 ° C. while being brought into contact with the surface of the sheet, and is then cooled by a winder (not shown) through a pair of take-up rolls 15, A foam sheet having a product width of 100 cm was manufactured. The cooling rate of the foamed sheet 1'was about 30 ° C / sec.
【００３０】得られた発泡シートの厚みを幅方向に３cm
間隔で測定し、その平均厚み及び厚みのばらつきＲ（最
大厚みと最小厚みとの差）を測定した。その結果、発泡
シートの平均厚みは１．０３mm、厚みのばらつきＲは
０．０３mmで、厚みのばらつきは非常に小さかった。The thickness of the obtained foamed sheet is 3 cm in the width direction.
The measurement was performed at intervals, and the average thickness and the thickness variation R (difference between the maximum thickness and the minimum thickness) were measured. As a result, the average thickness of the foamed sheet was 1.03 mm, the thickness variation R was 0.03 mm, and the thickness variation was very small.
【００３１】さらに、得られた発泡シート表面をコロナ
放電処理（トランジスター方式）して、その表面処理面
のぬれ指数をコロナ放電処理直後及び２週間後につい
て、ＪＩＳ Ｋ−６７６８に基づいて測定した。その結
果、コロナ放電処理直後のぬれ指数は５０ｄｙｎｅ／c
m、２週間後のぬれ指数は４３ｄｙｎｅ／cmで、表面処
理性は良好であった。Further, the surface of the obtained foamed sheet was subjected to corona discharge treatment (transistor system), and the wetting index of the surface-treated surface was measured immediately after corona discharge treatment and after 2 weeks according to JIS K-6768. As a result, the wetting index immediately after the corona discharge treatment was 50 dyne / c.
m, the wettability index after 2 weeks was 43 dyne / cm, and the surface treatability was good.
【００３２】実施例２ 実施例１において、一対の押圧ロール１３の間隙に通し
て押圧した発泡シート１' を、一対の冷却ロール１４に
より強制的に急冷することなく、室温で自然冷却しなが
ら一対の引取りロール１５を経て、巻取機（図は省略）
により巻き取って、製品幅１００cmの発泡シートを製造
した。それ以外は、実施例１と同様に行った。 Example 2 In Example 1, the foamed sheet 1'pressed through the gap between the pair of pressing rolls 13 was naturally cooled at room temperature without being forcibly cooled by the pair of cooling rolls 14. Winding machine (not shown) via the take-up roll 15
And a foamed sheet having a product width of 100 cm was manufactured. Other than that was performed like Example 1.
【００３３】この場合、発泡シートの平均厚みは１．０
３mm、厚みのばらつきＲは０．０５mmで、厚みのばらつ
きは小さかった。なお、自然冷却のため、コロナ放電処
理直後のぬれ指数は４４ｄｙｎｅ／cm、２週間後のぬれ
指数は３４ｄｙｎｅ／cmであった。In this case, the average thickness of the foamed sheet is 1.0.
The thickness variation was 3 mm and the thickness variation R was 0.05 mm, and the thickness variation was small. The wet index immediately after the corona discharge treatment was 44 dyne / cm and the wet index after 34 weeks was 34 dyne / cm due to natural cooling.
【００３４】比較例１ 実施例１において、発泡後の発泡シート１' を、一対の
押圧ロール１３を使用することなく、表面温度を１０℃
に調節した一対の冷却ロール１４の間隙に通し、発泡シ
ート１' を強制的に１０℃まで急冷した。それ以外は、
実施例１と同様に行った。 Comparative Example 1 In Example 1, the surface temperature of the foamed sheet 1 ′ after foaming was adjusted to 10 ° C. without using a pair of pressing rolls 13.
The foamed sheet 1 ′ was forcedly cooled to 10 ° C. by passing through the gap between the pair of cooling rolls 14 adjusted to 1. Other than that,
The same procedure as in Example 1 was performed.
【００３５】この場合、発泡シートの平均厚みは１．０
３mm、厚みのばらつきＲは０．０９mmで、厚みのばらつ
きが大きかった。なお、急冷のため、コロナ放電処理直
後のぬれ指数は５０ｄｙｎｅ／cm、２週間後のぬれ指数
は４２ｄｙｎｅ／cmで、表面処理性は良好であった。In this case, the average thickness of the foamed sheet is 1.0
The thickness variation was 3 mm and the thickness variation R was 0.09 mm, showing a large variation in thickness. Because of the rapid cooling, the wettability index immediately after the corona discharge treatment was 50 dyne / cm and the wettability index after 2 weeks was 42 dyne / cm, and the surface treatability was good.
【００３６】[0036]
【発明の効果】上述の通り、この発明は、発泡剤を含有
するポリオレフィン系樹脂発泡性シートを架橋させ加熱
発泡させた後冷却して、ポリオレフィン系樹脂発泡シー
トを製造する方法において、発泡後の発泡シートを上記
樹脂の（融点−２０℃）〜（融点＋５℃）の温度に加熱
された一対の押圧ロールにより押圧し、その後冷却する
するもので、それにより、厚みばらつきが小さいポリオ
レフィン系樹脂発泡シートを得ることができる。As described above, according to the present invention, in a method for producing a polyolefin resin foam sheet, the polyolefin resin foam sheet containing a foaming agent is crosslinked, heated and foamed, and then cooled to produce a polyolefin resin foam sheet. The foamed sheet is pressed by a pair of pressing rolls heated to a temperature of (melting point −20 ° C.) to (melting point + 5 ° C.) of the above resin, and then cooled, whereby a polyolefin resin foam having a small thickness variation. You can get a sheet.
【００３７】特に、上記の方法で一対の押圧ロールによ
り押圧された発泡シートを少なくとも５℃／秒の冷却速
度で急冷すると、厚みばらつきがより一層小さくなり、
且つコロナ放電処理等の表面処理性の良好なポリオレフ
ィン系樹脂発泡シートが得られる。In particular, when the foamed sheet pressed by the pair of pressing rolls by the above method is rapidly cooled at a cooling rate of at least 5 ° C./sec, variation in thickness is further reduced,
In addition, a polyolefin-based resin foam sheet having good surface treatability such as corona discharge treatment can be obtained.
【００３８】このように表面処理性の良好な発泡シート
は、コロナ放電処理した後、その表面に、例えば軟質塩
化ビニル樹脂シート等の表皮材を接着剤を用いて貼り合
わせると、剥離強度が大きい表皮材付き発泡シートを得
ることができるという利点がある。In this way, the foamed sheet having good surface treatment has a large peeling strength when a corona discharge treatment is performed and then a skin material such as a soft vinyl chloride resin sheet is attached to the surface thereof with an adhesive. There is an advantage that a foamed sheet with a skin material can be obtained.
【図１】この発明の一実施態様を説明するための側面図
である。FIG. 1 is a side view for explaining an embodiment of the present invention.
１ 発泡性シート １' 発泡シート ２ 加熱発泡炉 ４ 一対の送出しロール １２ しわしわ取り装置 １３ 一対の押圧ロール １４ 一対の冷却ロール １５ 一対の引取りロール DESCRIPTION OF SYMBOLS 1 Foaming sheet 1'Foaming sheet 2 Heating foaming furnace 4 A pair of delivery rolls 12 A wrinkle remover 13 A pair of pressing rolls 14 A pair of cooling rolls 15 A pair of take-up rolls
Claims (2)
発泡性シートを架橋させ加熱発泡させた後冷却して、ポ
リオレフィン系樹脂発泡シートを製造する方法におい
て、発泡後の発泡シートを上記樹脂の（融点−２０℃）
〜（融点＋５℃）の温度に加熱された一対の押圧ロール
により押圧し、その後冷却することを特徴とするポリオ
レフィン系樹脂発泡シートの製造方法。1. A method for producing a polyolefin-based resin foam sheet, comprising crosslinking a polyolefin-based resin foamable sheet containing a foaming agent, heating and foaming it, and then cooling the foamed sheet. -20 ° C)
A method for producing a polyolefin-based resin foam sheet, comprising: pressing with a pair of pressing rolls heated to a temperature of (melting point + 5 ° C), and then cooling.
発泡性シートを架橋させ加熱発泡させた後冷却して、ポ
リオレフィン系樹脂発泡シートを製造する方法におい
て、発泡後の発泡シートを上記樹脂の（融点−２０℃）
〜（融点＋５℃）の温度に加熱された一対の押圧ロール
により押圧し、その後少なくとも５℃／秒の冷却速度で
急冷することを特徴とするポリオレフィン系樹脂発泡シ
ートの製造方法。2. A method for producing a polyolefin-based resin foam sheet, which comprises crosslinking a polyolefin-based resin foamable sheet containing a foaming agent, heating and foaming it, and then cooling the foamed sheet. -20 ° C)
A method for producing a polyolefin-based resin foam sheet, comprising pressing with a pair of pressing rolls heated to a temperature of (melting point + 5 ° C) and then rapidly cooling at a cooling rate of at least 5 ° C / sec.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6094814A JPH07299832A (en) | 1994-05-09 | 1994-05-09 | Production of polyolefinic resin foamed sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6094814A JPH07299832A (en) | 1994-05-09 | 1994-05-09 | Production of polyolefinic resin foamed sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07299832A true JPH07299832A (en) | 1995-11-14 |
Family
ID=14120531
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6094814A Pending JPH07299832A (en) | 1994-05-09 | 1994-05-09 | Production of polyolefinic resin foamed sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07299832A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9260577B2 (en) | 2009-07-14 | 2016-02-16 | Toray Plastics (America), Inc. | Crosslinked polyolefin foam sheet with exceptional softness, haptics, moldability, thermal stability and shear strength |
| WO2021258609A1 (en) * | 2020-06-22 | 2021-12-30 | 浙江润阳新材料科技股份有限公司 | Thickness fixing apparatus for continuous foam material |
-
1994
- 1994-05-09 JP JP6094814A patent/JPH07299832A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9260577B2 (en) | 2009-07-14 | 2016-02-16 | Toray Plastics (America), Inc. | Crosslinked polyolefin foam sheet with exceptional softness, haptics, moldability, thermal stability and shear strength |
| US10301447B2 (en) | 2009-07-14 | 2019-05-28 | Toray Plastics (America), Inc. | Crosslinked polyolefin foam sheet with exceptional softness, haptics, moldability, thermal stability and shear strength |
| WO2021258609A1 (en) * | 2020-06-22 | 2021-12-30 | 浙江润阳新材料科技股份有限公司 | Thickness fixing apparatus for continuous foam material |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111194331A (en) | Polyolefin-based resin foam, method for producing the same, and adhesive tape | |
| JPH07299832A (en) | Production of polyolefinic resin foamed sheet | |
| US5087395A (en) | Method for processing radiation cross-link thin film foam | |
| JP3078089B2 (en) | Interior molded products for vehicles | |
| JP3346027B2 (en) | Polyethylene-based electron beam cross-linked foam | |
| JPH0362832A (en) | Foamed polyolefin resin and its production | |
| JPH07186171A (en) | Preparation of foamed thermoplastic resin sheet | |
| JPH0725123B2 (en) | Method for producing styrene resin foam | |
| JP3325492B2 (en) | Method for producing corona discharge treated foamed olefin resin sheet | |
| JP2507202B2 (en) | Polyolefin resin cross-linked foam | |
| JPH0994840A (en) | Manufacture of foamed material | |
| JP2002275301A (en) | Manufacturing method of crosslinked polyethylene-open cell foam | |
| JP2505664B2 (en) | Method for producing crosslinked polyolefin resin foam | |
| JP2025099188A (en) | Method for producing surface-treated foamed body and crosslinked foamed body of polyolefin resin | |
| JPH04153234A (en) | Production of expandable resin composition sheet | |
| JPH0570622A (en) | Polypropylene-based resin crosslinked foamed body | |
| JPH047340A (en) | Crosslinked polyethylene resin foam | |
| JPS63309431A (en) | Manufacture of crosslinked polypropylene foam | |
| JP2000007810A (en) | Polyolefin-based resin crosslinked foam and its production | |
| JPH0218224B2 (en) | ||
| JPH10287762A (en) | Production of thermoplastic resin foam | |
| JPH0957782A (en) | Production of long-sized foam | |
| JPH1015971A (en) | Production of thermoplastic resin foam | |
| JPH09300381A (en) | Apparatus and method for manufacturing foam | |
| JPH07164588A (en) | Interior molded product for vehicle |