1227255 A71227255 A7
五、發明説明（1 ) 【發明所屬的技術領域】 本發明係有關聚丙烯系樹脂擠壓發泡片材、其製造方 法’及該擠壓發泡片材之熱成形方法。 【習知技術】 過去以來，利用將聚苯乙烯系樹脂發泡片材予以熱成 形而獲得之食品包裝用容器等已被廣泛使用。此等容器具 有優良的輕量性、外觀、剛性、絕熱性，適合於做為包裝 材料，惟近年來因電子爐之普及，變得更要求要有耐熱性 等。 另一方面，替代聚苯乙烯系樹脂發泡片材之熱成形用 發泡片材的材料，最近，受到注目的有聚丙烯系樹脂發泡 片材。該發泡片材係，具有長鏈分枝之高熔體張力型（high melt tension type)的聚丙烯系樹脂被美國海蒙特（/、彳七y 卜）公司開發出來時，以該樹脂做原料，利用擠壓發泡法所 製造者。 【發明所欲解決之課題】 但疋’該聚丙稀系樹脂發泡片材如果在耐熱性上要優 於習知的聚苯乙烯系樹脂發泡片材，則因對原料之聚丙烯 系樹脂必需有形成長鏈分枝的步驟，因而變得價格高昂， 其結果’即有聚丙烯系掛脂發泡片材也必然變成高價物品 之問題。 關於此點’高溶體張力型聚丙稀系樹脂（以下稱「Hms —PP」）中，如果可以混合不具有長鏈分枝之低價的低熔體 張力型聚丙烯系樹脂（以下稱「LMS —PP」），以減少高價 本紙張尺度適用中國國家標準（CN5；) A4規格（21〇χ297公楚） 1227255 A7 ____Β7 五、發明説明（2 ) 的HMS—PP之使用量，即會牵涉到發泡片材之成本減低的 情形是明顯的。 但是，混合LMS—PP之聚丙烯系樹脂發泡片材，而且 在製得保形性高的熱成形品時，如果得到適當的表觀密度 度為150〜750 g/L的物品，則因獨立氣泡率無論如何都極 端的降低，使得混合LMS — PP之發泡片材在熱成形的用途 上之使用變得困難。 有鑑於上述各點，本發明之目的乃在於，以低成本提 供熱成形性優良之表觀密度為15〇〜75〇 g/L的聚丙烯系樹 脂發泡片材。 本發明人等就混合於HMS — PP之LMS — PP加以銳意 研究的結果，發現藉由選擇特定的LMS — PP，則即使是表 觀密度為150〜750 g/ L之聚丙烯系樹脂發泡片材，也可以 製得具有高獨立氣泡率之熱成形性優良的聚丙烯系樹脂發 泡片材，終於完成本發明。 【供解決課題之手段】 本發明提供， (1) 一種聚丙烯系樹脂擠壓發泡片材，特徵係以23〇〇c 之溶體張力為10 cN以上的聚丙烯系樹脂（a)15〜7〇重量 %，和230 °C之熔體張力為5 eN以下的聚丙烯系樹脂 (B)85〜30重量％(但是，聚丙烯系樹脂（A)+聚丙烯系樹脂 (B)= 100重量％)的混合物做為基材樹脂，表觀密度為 150〜750 g / L，及獨立氣泡率為5〇%以上； (2) 如上述第（1)項所載之聚丙稀系樹脂擠壓發泡片 本紙張尺度_㈣賴⑽）(21GX297公楚) ^' ----- 1227255 A7 ___ B7_ 五、發明説明（3 ) 材，特徵在於每1 m2聚丙烯系樹脂擠壓發泡片材之重量為 240〜600 g ; (3) 如上述第（1)或第（2)項所載之聚丙烯系樹脂擠壓發 泡片材，特徵在於，將聚丙烯系樹脂擠壓發泡片材在14〇 °C的拉伸屈服點強度（N)，除以該發泡片材每1 m2的重量之 數值為150 X 1〇·4Ν/ g以上； (4) 一種聚丙烯系樹脂擠壓發泡片材之製造方法，特徵 係將230 C之溶體張力為10 cN以上的聚丙烯系樹脂 (A) 15〜70重量％，和230°C之熔體張力為5 cN以下的聚丙婦 系樹脂（B)，以聚丙烯系樹脂（A)為15〜70重量％及聚丙烯系 樹脂（B)為85〜30重量％的比例（但是，聚丙烯系樹脂（八)+聚 丙烯系樹脂（B)= 100重量％)狀態，置入擠壓機内使其熔 融，並在發泡劑的存在下予以熔融混煉，接著從擠壓機内 擠出並使其發泡，得到表觀密度為150〜750 g / L，及獨立 氣泡率為50%以上之發泡片材； (5) 如上述第（4)項所載之聚丙烯系樹脂擠壓發泡片材 的製造方法，特徵在於聚丙烯系樹脂（B)之熔點與聚丙烯系 樹脂（A)之溶點的差（樹脂（B)之熔點一樹脂（A)之溶點）為— 2 〜8°C ; (6) 如上述第（4)或第（5)項所載之聚丙烯系樹脂擠壓發 泡片材的製造方法，特徵在於聚丙烯系樹脂（B)之熔體流動 率為聚丙烯系樹脂（A)之熔體流動率的1·2倍以上； (7) 如上述第（6)項所載之聚丙烯系樹脂擠壓發泡片材 的製造方法，特徵在於聚丙烯系樹脂（Β)之熔體流動率為聚 本紙張尺度適用中國國家標準（CNS) Α4規格（210X297公釐） (請先閲讀背面之注意事項再填寫本頁) 、^τ— 1227255V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to a polypropylene resin extruded foamed sheet, a method for manufacturing the same ', and a method for thermoforming the extruded foamed sheet. [Know-how] In the past, containers for food packaging and the like obtained by thermoforming a polystyrene resin foamed sheet have been widely used. These containers have excellent lightness, appearance, rigidity, and heat insulation, and are suitable for use as packaging materials. However, in recent years, due to the spread of electronic furnaces, heat resistance has been required even more. On the other hand, polypropylene foamed sheets have recently attracted attention as materials that replace foamed sheets for thermoforming of polystyrene foamed sheets. This foamed sheet is a high-melt tension type polypropylene resin with long-chain branching. When it was developed by American Hymont (/, 彳 七 y 卜), this resin is used to make The raw materials are manufactured by the extrusion foaming method. [Problems to be Solved by the Invention] However, if the polypropylene resin foamed sheet is superior in heat resistance to the conventional polystyrene resin foamed sheet, the raw material of the polypropylene resin is A long-chain branching step is required, which is expensive, and as a result, even if a polypropylene-based fat-hanging foamed sheet is inevitable, it becomes a problem that it becomes an expensive item. Regarding this point, if a high-melt tension polypropylene resin (hereinafter referred to as "Hms-PP") can be blended with a low-cost low-melt tension polypropylene resin (hereinafter referred to as "" LMS-PP ") to reduce the price of high-priced paper. Applicable to Chinese national standard (CN5;) A4 specification (21〇χ297 公 Chu) 1227255 A7 ____ Β7 5. The amount of HMS-PP used in the description of the invention (2) will involve It is obvious that the cost of the foamed sheet is reduced. However, if a polypropylene resin foam sheet of LMS-PP is mixed and a thermoformed product having high shape retention properties is obtained, if an article having an appropriate apparent density of 150 to 750 g / L is obtained, The closed cell ratio is extremely reduced in any case, making it difficult to use LMS-PP foamed sheet in thermoforming applications. In view of the foregoing, an object of the present invention is to provide a polypropylene-based resin foamed sheet having an apparent density of 150 to 75 g / L which is excellent in thermoformability at a low cost. The inventors have conducted intensive research on LMS-PP mixed with HMS-PP, and found that by selecting a specific LMS-PP, even polypropylene resins with an apparent density of 150 to 750 g / L are foamed. The sheet can also be made of a polypropylene-based resin foamed sheet having excellent thermoformability with a high closed cell ratio, and finally completed the present invention. [Means for solving the problem] The present invention provides, (1) a polypropylene resin extruded foamed sheet, characterized by a polypropylene resin (a) 15 having a solution tension of 2300c of 10 cN or more ~ 70% by weight, and polypropylene resin (B) with a melt tension of 230 ° C of 5 eN or less 85 ~ 30% by weight (however, polypropylene resin (A) + polypropylene resin (B) = 100% by weight) as a base resin, with an apparent density of 150 to 750 g / L, and a closed cell ratio of 50% or more; (2) Polypropylene resin as described in (1) above Extruded Foam Sheet Paper Size _㈣lai⑽) (21GX297 Gongchu) ^ '----- 1227255 A7 ___ B7_ V. Description of the Invention (3) Material, which is characterized in that every 1 m2 of polypropylene resin extruded hair The foam sheet has a weight of 240 to 600 g; (3) The polypropylene resin extruded foam sheet as described in the above item (1) or (2) is characterized in that the polypropylene resin is extruded The tensile yield point strength (N) of the foamed sheet at 14 ° C, divided by the weight of the foamed sheet per 1 m2, is 150 X 10.4N / g or more; (4) a polypropylene Resin extruded hair The sheet manufacturing method is characterized in that polypropylene resin (A) having a solution tension of 230 C of 10 cN or more is 15 to 70% by weight, and a polypropylene resin having a melt tension of 230 ° C of 5 cN or less (B) a ratio of 15 to 70% by weight of the polypropylene resin (A) and 85 to 30% by weight of the polypropylene resin (B) (however, the polypropylene resin (8) + polypropylene resin ( B) = 100% by weight), put it into an extruder to melt it, melt-knead it in the presence of a foaming agent, and then extrude from the extruder and foam it to obtain an apparent density of 150 ~ 750 g / L, and foamed sheet with an open cell ratio of 50% or more; (5) The manufacturing method of the polypropylene-based resin extruded foamed sheet as described in item (4) above, characterized in that The difference between the melting point of the propylene resin (B) and the melting point of the polypropylene resin (A) (the melting point of the resin (B)-the melting point of the resin (A)) is-2 to 8 ° C; (6) as described above The method for producing a polypropylene resin extruded foamed sheet as described in item (4) or (5), characterized in that the melt flow rate of the polypropylene resin (B) is a polypropylene tree The melt flow rate of the grease (A) is more than 1.2 times; (7) The manufacturing method of the polypropylene resin extruded foamed sheet as described in the item (6) above, characterized in that the polypropylene resin ( Β) The melt flow rate is based on the size of this paper. Applicable to China National Standard (CNS) A4 specification (210X297 mm) (Please read the precautions on the back before filling this page), ^ τ— 1227255
丙烯系樹脂（A)之熔體流動率的ι·3〜5·〇倍； (8) —種聚丙稀系樹脂擠壓發泡片材之熱成形方法，特 徵係將上述第（1)至第（3)項的任一項所載之聚丙烯系樹脂 擠壓發泡片材予以加熱軟化後，再熱成形為所需的形狀。 【發明之實施態樣】 本發明中所使用的基材樹脂係由下述之聚丙烯系榭脂 (Α)及聚丙烯系樹脂（Β)所形成。 聚丙烯系樹脂（Α)(以下有簡稱為樹脂（Α)者）可舉例如 聚丙烯和、乙烯一丙烯嵌段共聚物、乙烯一丙烯無規共聚 物、丙烯一丁烯嵌段共聚物、丙烯一丁烯無規共聚物、乙 烯一丙烯一丁烯三元共聚物等之丙烯系共聚物。丙烯系共 聚物通常係指丙稀成分含量在50重量％以上者，尤以重 量％以上者為佳。 樹脂（Α)在230°C之熔體張力顯示為丨〇 cN以上。若樹脂 (A)之該溶體張力不滿1〇 cn，則表觀密度為15〇〜75〇 g / l 的聚丙烯系樹脂擠壓發泡片材，而且成形性優良之獨立氣 泡率為50%以上的發泡片材將無法製得。為獲得獨立氣泡 率更南之聚丙烯系樹脂擠壓發泡片材，上述樹脂（A)之該溶 體張力以11 cN以上為佳，13 cN以上較佳，15 以上更 佳。相反地，如果上述樹脂（A)之該熔體張力太大，則所獲 得之發泡片材因有熱成形時的拉伸降低而熱成形性下降之 虞，做上述樹脂（A)之該熔體張力以60 CN以下為宜，5〇 cN 以下較佳，40 cN以下更佳。 另，樹脂（A)以熔體流動率（依據jis K7210 : 1999之附 ^紙張尺度適用中國國家標準（CNS) A4規格（210X297公釐) ' :η ------ 1227255The melt flow rate of propylene resin (A) is ι · 3 ~ 5 · times; (8)-a method of thermoforming a polypropylene resin extruded foamed sheet, which is characterized in that the above (1) to (1) to The polypropylene resin extruded and foamed sheet contained in any one of the items (3) is heated and softened, and then thermoformed into a desired shape. [Embodiments of the Invention] The base resin used in the present invention is made of the following polypropylene resin (A) and polypropylene resin (B). Examples of the polypropylene resin (A) (hereinafter abbreviated as resin (A)) include polypropylene, ethylene-propylene block copolymer, ethylene-propylene random copolymer, propylene-butene block copolymer, Propylene-butene random copolymers, ethylene-propylene-butene terpolymers, and other propylene-based copolymers. The propylene-based copolymer generally refers to those having a propylene content of 50% by weight or more, and particularly preferably those having a content of 5% by weight or more. The melt tension of the resin (A) at 230 ° C. was shown as ≧ 0 cN or more. If the solution tension of the resin (A) is less than 10 cn, a polypropylene resin extruded foam sheet having an apparent density of 150 to 75 g / l, and an excellent closed cell ratio of 50 More than% of foamed sheet cannot be made. In order to obtain a polypropylene-based resin extruded foamed sheet having a more closed cell ratio, the above-mentioned resin (A) has a solution tension of preferably 11 cN or more, more preferably 13 cN or more, and more preferably 15 or more. Conversely, if the melt tension of the resin (A) is too large, the obtained foamed sheet may have reduced thermoformability due to a decrease in stretching during thermoforming. The melt tension is preferably 60 CN or less, more preferably 50 cN or less, and more preferably 40 cN or less. In addition, the resin (A) is based on the melt flow rate (according to jis K7210: 1999) ^ Paper size applies Chinese National Standard (CNS) A4 specification (210X297 mm) ': η ------ 1227255
五、發明説明（5 ) 屬書A表1的條件Μ所測定之值）為〇·3〜12 g/ 1〇分鐘者為 宜，而以0.5〜8 g/ 10分鐘者較佳。 (請先閲讀背面之注意事項再填寫本頁) 又’樹脂（A)之熔點若考慮所獲得之發泡片材的耐熱 性，則以156°C以上為佳。 樹脂（A)通常係對230°C之熔體張力顯示為5 cN以下的 低熔融張力之聚丙烯系樹脂，利用使電子射線或過氧化物 作用而形成長鏈分枝，或使稍微形成交聯而獲得。如此之 上述樹脂（A)可舉例如市售的蒙特爾（乇y于小）公司之 「PF814」和「SD632」等。 、可丨 上述聚丙烯系樹脂（A)因擠壓發泡性良好，故僅使用樹 月曰（A)做為基材樹脂，即可獲得獨立氣泡率高之擠壓發泡 體。但是，僅使用樹脂（A)而製得之發泡體，其原料費用無 論如何都會變得很高。因此，在本發明中，為減低原料成 本，乃將以下之聚丙烯系樹脂（B)(以下簡稱為樹脂（B))混合 至樹脂（A)做為基材樹脂。 樹脂(B)可舉例如聚丙烯和，乙烯一丙烯嵌段共聚物、 乙烯一丙烯無規共聚物、丙烯一丁烯嵌段共聚物、丙烯一 丁烯無規共聚物、乙烯一丙烯一丁烯三元共聚物等之丙烯 系共聚物。丙烯系共聚物通常係指丙烯成分含量在5〇重量 %以上者，尤以80重量％以上者為佳。 樹脂（B)在230°C之熔體張力顯示為5 eN以下。因使用 230°C之熔體張力超過5 cN的聚丙烯樹脂，會造成原料成本 上昇，故而不宜。通常不實施使電子射線或過氧化物作用 而形成長鏈分枝，或不實施稍微形成交聯之操作的平常的 Ϊ紙張尺度適用中國國家標準（CNS) A4規格（210X297公釐^ --------- 1227255 A7 _ _B7 五、發明説明（6 ) 聚丙烯系樹脂即符合樹脂（B)。通常，樹脂（B)在230°C之熔 體張力為0.05 cN以上，惟以〇·1〜3.5 cN為佳。 (請先閲讀背面之注意事項再填寫本頁) 而，即使是樹脂（A)，以擠壓機等在熔融狀態下施以強 剪斷的材料中，也有230°C之熔體張力降低到5 cN以下者。 例如，將樹脂（A)，或樹脂（A)與樹脂（B)在擠壓機中施以強 剪斷，然後使之擠壓發泡而得到之發泡片材，雖可以使用 於熱成形等，惟，在將當時所除掉的殘渣再度熔融而獲得 之顆粒（pellet)中，有230°C之熔體張力降低到5 cN以下者， 此種顆粒即可以當做樹脂（B)使用。 另，樹脂（B)之熔體流動率（依據JIS K7210 : 1999之附 屬書A表1的條件Μ所測定之值）（以下稱「MFR—B」），為 樹脂（Α)之同熔體流動率（以下稱「MFR—Α」）的1·2倍以上 者為宜，而以MFR— Β為MFR— Α之1.3〜5.0倍者較佳，為 MFR—A之1.5〜4.0倍者更佳。若MFR— B為MFR—A之1.2 倍以上，則可以使發泡溫度充分降低，因而可以容易地製 得獨立氣泡率高之發泡片材。 又，樹脂（A)雖提高到在擠壓機内等被熔融混煉然後被 擠出，和被熔融混煉之前的熔體流動率之2〜4倍，惟樹脂（B) 與被熔融混煉之前的熔體流動率相比，或者大致上未改 變’或者僅僅稍微上昇。而，如果MFR—B是合宜的MFR —A之1.3〜5.〇倍，較佳的1.5〜4.0倍，則由於在擠壓機内， 樹脂（A)與樹脂（B)的熔體流動率大約相同，其結果，二者 之混合變得更均勻，而且即使充分地降低發泡溫度，依然 可以抑止結晶化物之產生，因此可以製得獨立氣泡率更高 本紙張尺度適用中國國家檩準（) A4規格（210χ297公釐） -9 - 12272555. Description of the invention (5) The value measured under condition M of Table 1 of Book A) is 0.3 to 12 g / 10 minutes, and 0.5 to 8 g / 10 minutes is more preferable. (Please read the precautions on the back before filling in this page.) The melting point of the resin (A) is preferably 156 ° C or higher, considering the heat resistance of the obtained foamed sheet. Resin (A) is usually a polypropylene resin with a low melt tension at a melt tension of 230 ° C of 5 cN or less. It is formed by the action of electron rays or peroxides to form long-chain branches or slightly cross-links. Get together. Such resins (A) include, for example, commercially available "PF814" and "SD632" from Montell (Small & Young). Yes, the polypropylene resin (A) mentioned above has good extrusion foaming properties, so it is possible to obtain an extruded foam with a high closed cell ratio by using only the tree resin (A) as the base resin. However, in the case of a foam obtained by using only the resin (A), the raw material cost becomes high in any case. Therefore, in the present invention, in order to reduce the raw material cost, the following polypropylene-based resin (B) (hereinafter referred to as resin (B)) is mixed with resin (A) as the base resin. Examples of the resin (B) include polypropylene and ethylene-propylene block copolymer, ethylene-propylene random copolymer, propylene-butene block copolymer, propylene-butene random copolymer, and ethylene-propylene-butylene. A propylene-based copolymer such as an olefin terpolymer. The propylene-based copolymer generally refers to a propylene component content of 50% by weight or more, particularly preferably 80% by weight or more. The melt tension of the resin (B) at 230 ° C was 5 eN or less. Polypropylene resin with a melt tension of more than 5 cN at 230 ° C will increase the cost of raw materials, so it is not suitable. Normally, the normal paper size without the action of forming long-chain branches by the action of electron rays or peroxides, or the operation of slightly cross-linking, is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm ^ --- ------ 1227255 A7 _ _B7 V. Description of the invention (6) Polypropylene resin is compatible with resin (B). Generally, the melt tension of resin (B) at 230 ° C is above 0.05 cN, but it is 〇 · 1 ~ 3.5 cN is preferred. (Please read the precautions on the back before filling in this page.) In addition, even resin (A), which is strongly sheared in the molten state by an extruder, has 230. The melt tension at ° C is lower than 5 cN. For example, the resin (A), or the resin (A) and the resin (B) are subjected to strong shearing in an extruder, and then extruded and foamed. Although the obtained foamed sheet can be used for thermoforming, etc., among the pellets obtained by remelting the residues removed at that time, the melt tension at 230 ° C is reduced to less than 5 cN Such particles can be used as resin (B). In addition, the melt flow rate of resin (B) (based on JIS K7210: 1999 The value measured under Condition M in Table 1 of Appendix A) (hereinafter referred to as "MFR-B") is more than 1.2 times the same melt flow rate of the resin (A) (hereinafter referred to as "MFR-A") It is better, and MFR-B is 1.3 to 5.0 times of MFR-A, and more preferably 1.5 to 4.0 times of MFR-A. If MFR-B is more than 1.2 times of MFR-A, you can make The foaming temperature is sufficiently reduced, so that a foamed sheet having a high closed cell ratio can be easily produced. Moreover, the resin (A) is raised to be melt-kneaded in an extruder, etc., and then extruded, and melt-kneaded. The previous melt flow rate is 2 to 4 times, but the resin (B) is almost unchanged compared with the melt flow rate before being melt-kneaded, or only slightly increased. However, if MFR-B is appropriate, MFR-A is 1.3 to 5.0 times, preferably 1.5 to 4.0 times, because in the extruder, the melt flow rates of the resin (A) and the resin (B) are about the same. As a result, the two The mixing becomes more uniform, and even if the foaming temperature is sufficiently reduced, the generation of crystals can be suppressed, so an independent cell ratio can be obtained This paper suitable for high-scale Chinese National purlin quasi () A4 size (210χ297 mm) -9--1227255
的發泡片材。 另，以樹脂（B)之熔點與樹脂（A)之熔點的差（樹脂（b) 7點-樹脂（A)之溶點）為一 2〜8〇c的條件選擇樹脂⑻為 宜，而以其差值為1〜rt的條件選擇樹脂（B)為較佳。其間 之差值越是比一 2 °c小，則若欲獲得獨立氣泡率高的發泡片 材而將發泡溫度降低，樹脂⑻將開始結晶化，結晶物變得 谷易發生於發泡片材中，商品價值乃降低。反之，其差值 越疋比8 C大，則變得難以獲得獨立氣泡率高之發泡片材。 本發明中，合適的樹脂（B)可以使用聚丙烯均聚物、丙 烯一乙烯嵌段共聚物，或於聚丙烯均聚物中混合橡膠成分 所形成之耐衝擊聚丙烯。樹脂（B)的熔點&155χ：以上為 宜，並以157°C以上較佳。 另，树脂（A)之結晶化溫度與樹脂（B)之結晶化溫度的 差以12 C以上為宜。其差值若在丨2°c以下，因製造發泡片 材日守谷易產生結晶化物，故而不合適。其差值為13〜3 5。。 者較佳。 本發明中’樹脂（A)與樹脂（B)可以在樹脂（a) 15〜70重 里0/〇 ’樹脂（B)85〜30重量％的比例下混合而使用（但是，樹 月曰（A) +樹脂⑻=1〇〇重量％)。其時，樹脂（A)的混合比例如 果太多’則對於降低成本的貢獻將會變小。反之，樹脂（A) 的混合比例如果太少，則或者變得難以得到獨立氣泡率大 之發泡片材，或者即使得到獨立氣泡率高的發泡片材，氣 泡仍然易於在熱成形時破泡，變得難以製成良好的熱成形 品0 10 本紙張尺度適用中國國家標準（CNS) A4規格（210X297公釐） 1227255 A7 B7 五、發明説明（8 ) 在本發明中雖以使用上述樹脂（A)與樹脂（B)的混合物 做為基材樹脂為基礎，惟在不妨礙本發明所期望的目的之 範圍内，也可以在基材樹脂中含有離子鍵聚合物（ionomer) 和，乙烯一丙烯橡膠等之彈性體。其等之量相當於每100 重量份之樹脂（A)與樹脂（B)的混合物，至多有30重量份， 而以20重量份以下為佳。 另，上述樹脂（A)或樹脂（B)的熔體張力可以用股份有 P艮公司東洋精機製作所製造之熔體張力測試機II (melt tension tester II)加以測定。具體而言，使用具有喷嘴 (orifice)内徑2.095 mm、長度8 mm之喷嘴的溶體張力測試 機，預先將上述喷嘴昇溫至230°C，並將樹脂（A)或樹脂（B)4 g放入其中，從放置5分鐘開始，將活塞的擠壓速度設成10 mm /分，把230°C的熔融樹脂從喷嘴呈繩狀擠壓出來，然 後將此繩狀物掛在直徑45 mm之張力檢測用滑輪後，以5 irpm/秒（繩狀物之捲取加速度：1.3\10_2111/秒2)的比例， 一邊緩緩地使捲取速度增加，一邊以直徑50 mm滾筒捲取。 本發明中，在求算熔體張力時，首先，使捲取速度增 加，直到掛在張力檢測用滑輪的繩狀物被切斷為止，求算 繩狀物被切斷時之捲取速度：R (rpm)。接著，在Rx〇.7 (rpm) 之固定捲取速度中進行繩狀物之捲取，並利用與張力檢測 用滑輪相連結之檢測器，經時地測定受檢測之繩狀物的溶 體張力；若將熔體張力示為縱軸，時間示為橫軸地製成曲 線圖，則可以獲得具有如第1圖所示之振幅的曲線圖。 本發明中之熔體張力係採用第1圖中，振幅安定的部分 11 (請先閲讀背面之注意事項再填寫本頁) 本紙張尺度適用中國國家標準（CNS) A4規格（210X297公釐） 1227255 A7Foamed sheet. In addition, the resin ⑻ is preferably selected on the condition that the difference between the melting point of the resin (B) and the melting point of the resin (A) (7 points of the resin (b)-the melting point of the resin (A)) is 2 to 80c, The resin (B) is preferably selected on the condition that the difference is 1 to rt. The smaller the difference between them is, the lower the foaming temperature is if you want to obtain a foamed sheet with a high closed cell ratio, the resin ⑻ will begin to crystallize, and the crystals will become susceptible to foaming. In the sheet, the value of the commodity is reduced. Conversely, as the difference becomes larger than 8 C, it becomes difficult to obtain a foamed sheet having a high closed cell ratio. In the present invention, a suitable resin (B) may be a polypropylene homopolymer, a propylene-ethylene block copolymer, or an impact-resistant polypropylene formed by mixing a rubber component with the polypropylene homopolymer. Melting point & 155x of the resin (B): The above is preferable, and more preferably 157 ° C or more. The difference between the crystallization temperature of the resin (A) and the crystallization temperature of the resin (B) is preferably 12 C or more. If the difference is less than 2 ° c, it is not suitable because Risutani, a foamed sheet, easily produces crystals. The difference is 13 ~ 35. . Those are better. In the present invention, the 'resin (A) and the resin (B) may be used by mixing the resin (a) at 15 to 70 weight percent and the resin (B) at 85 to 30% by weight (however, Shuyue (A ) + Resin (100% by weight). At this time, if the mixing ratio of the resin (A) is too large, the contribution to cost reduction will be small. Conversely, if the blending ratio of the resin (A) is too small, it may become difficult to obtain a foamed sheet with a large closed cell ratio, or even if a foamed sheet with a high closed cell ratio is obtained, the bubbles are still easily broken during thermoforming. It becomes difficult to make a good thermoformed product. 0 10 This paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) 1227255 A7 B7. 5. Description of the invention (8) Although the above resin is used in the present invention The mixture of (A) and resin (B) is used as the base resin, but the base resin may contain ionomer and ethylene as long as it does not hinder the desired purpose of the present invention. An elastomer such as acrylic rubber. The equivalent amount is up to 30 parts by weight per 100 parts by weight of the mixture of the resin (A) and the resin (B), and preferably 20 parts by weight or less. The melt tension of the resin (A) or the resin (B) can be measured using a melt tension tester II manufactured by Toyo Seiki Seisakusho Co., Ltd. Specifically, using a solution tension tester having a nozzle with an inner diameter of 2.095 mm and a length of 8 mm, the nozzle was heated to 230 ° C in advance, and 4 g of resin (A) or resin (B) was used. Put it in, start from 5 minutes, set the piston pressing speed to 10 mm / min, squeeze the molten resin at 230 ° C from the nozzle into a rope shape, and then hang the rope with a diameter of 45 mm After the pulley for tension detection, at a rate of 5 irpm / second (winding acceleration of the rope: 1.3 \ 10_2111 / second2), while slowly increasing the winding speed, it was wound by a 50 mm diameter roller. In the present invention, when calculating the melt tension, first, the winding speed is increased until the rope hanging on the tension detecting pulley is cut, and the winding speed when the rope is cut is calculated: R (rpm). Next, the rope is taken up at a fixed winding speed of Rx0.7 (rpm), and the solution of the rope to be detected is measured with time using a detector connected to a pulley for tension detection. If the melt tension is plotted on the vertical axis and time is plotted on the horizontal axis, a graph having an amplitude as shown in FIG. 1 can be obtained. The melt tension in the present invention uses the part 11 in Figure 1 with stable amplitude (please read the precautions on the back before filling this page) This paper size is applicable to China National Standard (CNS) A4 (210X297 mm) 1227255 A7
1227255 A7 B7 五、發明説明（l〇 ) 模，而以從T塑模擠壓模擠壓出來的方法加以製造。 上述發泡劑可以使用無機發泡劑、揮發性發泡劑、分 解型發泡劑等。無機發泡劑可以使用二氧化碳、空氣、氮 等。揮發性發泡劑可以使用丙烧、η — 丁烧、i 一 丁烧、庚 烷、己烷等脂肪族碳氫化合物，環丁烷、環庚烷等之環式 脂肪族碳氫化合物，一氟三氯甲烷、二氯二氟曱烷、二氯 四氟乙烧、氯甲烧（methyl chloride)、氯乙烧（ethyl chloride)、二氯甲烧（methylene chloride)等之鹵化烴等。而 分解型發泡劑可以使用偶氮甲醯胺（azodicarbonamide)、二 亞石肖基五甲撐四胺（dinotrosopentamethylene tetramine)、偶 氮二異丁腈（azobisisobutyronitrile)、碳酸氫納等。此等發 泡劑亦可適當混合而使用。 發泡劑之使用量雖亦因發泡劑的種類、所期望的發泡 倍率等而異，惟為獲得表觀密度150〜750 g/L之聚丙烯系 樹脂擠壓發泡片材，發泡劑的使用量基準為每100重量份樹 脂有0.1〜5重量份左右。 在擠壓機内將基材樹脂與發泡劑予以溶融混煉時，可 以依據需要而添加各種添，加劑。添加劑可舉例如滑石、二 氧化矽等之無機粉末和多價碳酸的酸性鹽，多價碳酸與碳 酸鈉或碳酸氫鈉之反應混合物等之氣泡調整劑，滑石、二 氧化矽、碳酸鈣、粘土、沸石、氧化鋁、硫酸鋇等之無機 填充劑（滑石、二氧化矽亦具有氣泡調整劑之功能），熱安 定劑、紫外線吸收劑、氧化防止劑、著色劑等。每100重量 份基材樹脂可以添加上述氣泡調整劑13重量份左右以下 13 (請先閱讀背面之注意事項再填寫本頁) 本紙張尺度適用中國國家標準（CNS) A4規格（210X297公董） 12272551227255 A7 B7 V. Description of the invention (10) The mold is manufactured by extrusion from a T-die extrusion die. As the foaming agent, an inorganic foaming agent, a volatile foaming agent, a decomposition type foaming agent, and the like can be used. As the inorganic blowing agent, carbon dioxide, air, nitrogen, and the like can be used. As the volatile blowing agent, aliphatic hydrocarbons such as propane, η-butane, i-butane, heptane, and hexane; cycloaliphatic hydrocarbons such as cyclobutane and cycloheptane; Halogenated hydrocarbons such as chlorotrichloromethane, dichlorodifluoromethane, dichlorotetrafluoroethane, methyl chloride, ethyl chloride, methylene chloride, etc. As the decomposition type foaming agent, azodicarbonamide, dinotrosopentamethylene tetramine, azobisisobutyronitrile, sodium bicarbonate, and the like can be used. These foaming agents can also be used in an appropriate mixture. Although the amount of foaming agent used also varies depending on the type of foaming agent and desired expansion ratio, etc., in order to obtain a polypropylene resin extruded foam sheet with an apparent density of 150 to 750 g / L, The use amount of the foaming agent is about 0.1 to 5 parts by weight per 100 parts by weight of the resin. When the base resin and the foaming agent are melt-kneaded in the extruder, various additives and additives can be added as required. Examples of the additives include inorganic powders such as talc, silicon dioxide, and acid salts of polyvalent carbonic acid; bubble regulators such as a reaction mixture of polyvalent carbonic acid with sodium carbonate or sodium bicarbonate; talc, silicon dioxide, calcium carbonate, clay , Zeolite, alumina, barium sulfate and other inorganic fillers (talc, silicon dioxide also has the function of bubble regulator), heat stabilizers, ultraviolet absorbers, oxidation inhibitors, colorants, etc. For each 100 parts by weight of the base resin, the above-mentioned air bubble adjusting agent can be added to about 13 parts by weight or less. 13 (Please read the precautions on the back before filling in this page.) This paper size applies to China National Standard (CNS) A4 (210X297). 1227255
1227255 五、發明説明（l2 ) (N)除以該發泡片材之每lm2的重量（g)所得之數值（以下稱 「Ng值」），無論在發泡片材的擠壓方向，或者在與擠壓 方向直角相交之所謂的寬度方向，均以15〇xl〇-4N/g以上 為宜，而16〇xl〇-4N/g以上更佳。該Ng值越大，雖然在熱 成形時，當片材被拉伸時不易發生龜裂，惟若大得過度， 則有導致準確的熱成形變得困難之虞。由此觀點，上述Ng 值以22(^10_4/§以下為宜，而以22〇><1〇-%/§以下較佳。 又，在14(TC之拉伸屈服點強度係依據JIS Κ6767· 1999 之附屬書1之2，將夾盤（Chuck)間距離設為50 mm，圍繞張 力測試機的測定部位之恆溫槽内調溫至14〇。(〕（該調溫操作 持續至拉伸試驗完了），打開恆溫槽的門並迅速地將測定試 料裝填到恆溫槽内然後關閉恆溫槽的門（從打開門到關閉 為止之間设疋為4秒），自此開始放置丨分鐘，然後開始拉伸 試驗以計算拉伸屈服點強度。此時，對各個方向分別實施3 次測定，並採用該3次之相加平均值。 獨立氣泡率越高，坪量越重，擠壓不久後朝擠壓方向 及寬度方向之拉伸程度越是大到某種程度為止，發泡片材 在140 C之拉伸屈服點強度會顯示出越大的數值。藉考慮此 等要點並施以預備實驗，即可以獲得目標之拉伸屈服點強 度的發泡片材。 上述發片材之獨立氣泡率係從依據ASTM D2856— 70 所記載的程序，使用東芝貝克曼（< 7夕^^)株式會社製的 空氣比較式比重計930型所測定出之發泡體的真實體積： Vx ’以下述式（1)算出來的，並以3次測定值的平均值求得。 (210X297公釐） 本紙張尺度適用中國國家標準（CNS) A4規格 1227255 A7 B7 五、發明説明（l3 【數1】 s (〇/〇) = (Vx-W/ P ) X i〇〇/(Va-w/ p ) (1) ---------------------..... (請先閲讀背面之注意事項再填寫本頁} 但是，上述式（1)中，Vx係以上述方法所測定之真實體 積（cm3)，相當於構成發泡體的樹脂之容積，和發泡體内之 獨立氣泡部分的氣泡總容積。其餘，上述式（1)中之Va、W、 P係如下所述。1227255 V. Description of the invention (l2) (N) divided by the weight (g) per lm2 of the foamed sheet (hereinafter referred to as "Ng value"), regardless of the extrusion direction of the foamed sheet, or In the so-called width direction, which intersects the extrusion direction at right angles, it is preferable to be more than 15 × 10-4N / g, and more preferably more than 16 × 10-4N / g. The larger the Ng value is, it is difficult for cracks to occur when the sheet is stretched during thermoforming. However, if the Ng value is excessively large, accurate thermoforming may become difficult. From this point of view, the above Ng value is preferably 22 (^ 10_4 / § or less, and more preferably 22 ° < 10-% / § or less. In addition, the tensile yield point strength at 14 ° is based on JIS K6767 · 1999 Supplement 1 to 2 sets the distance between the chucks to 50 mm, and adjusts the temperature in the constant temperature bath around the measuring part of the tension tester to 14 °. (] (The temperature adjustment operation is continued until After the tensile test is completed), open the door of the thermostatic bath and quickly fill the measurement sample into the thermostatic bath, then close the thermostatic bath door (set to 4 seconds from the opening of the door to the closing), and then let it stand for 丨 minutes Then, the tensile test is started to calculate the tensile yield point strength. At this time, three measurements are performed in each direction and the average value of the three times is used. The higher the independent bubble rate, the heavier the plateau weight, the squeeze In the near future, the greater the degree of stretching in the extrusion direction and the width direction, the larger the value of the tensile yield point strength of the foamed sheet at 140 C will show a larger value. Taking these points into consideration and applying Based on preliminary experiments, a foam sheet with a target tensile yield point strength can be obtained. The closed cell ratio of the hair sheet is a foam measured from a procedure described in ASTM D2856-70 using an air comparative hydrometer 930 manufactured by Toshiba Beckman (& 7 ^^) Co., Ltd. The real volume of Vx 'is calculated by the following formula (1), and it is obtained by the average of three measured values. (210X297mm) This paper size applies Chinese National Standard (CNS) A4 specification 1227255 A7 B7 V. Description of the invention (l3 [Number 1] s (〇 / 〇) = (Vx-W / P) X i〇〇 / (Va-w / p) (1) ------------- --------..... (Please read the precautions on the back before filling out this page} However, in the above formula (1), Vx is the actual volume (cm3) measured by the above method, which is equivalent The volume of the resin constituting the foam and the total volume of the bubbles in the independent bubble portion in the foam. The rest, Va, W, and P in the above formula (1) are as follows.
Va :從使用於測定中的發泡體之外觀尺寸所計算得之 發泡體的表觀體積（cm3) W :於測定中所使用的發泡體之總重量（g) p ··構成發泡體之基材樹脂的密度（g/cm3) 另， 本紙張尺度適用中國國家標準（CNS) A4規格（210 X 297公釐） 1227255 A7 B7五、發明説明（14 ) 本紙張尺度適用中國國家標準（CNS) A4規格（210X297公釐） ※一聲諦㊀«恭邈·皆许彳>>3雔效^荼「？1"—81私」 聲諦Θ&涞；5礪莽Α岭律雔讳a^r ioemitsc PP J700GP」 聲恭ΘE-3n^(4vm^丨)莽《蛉贫雔铐 a^「E-3ll^( ) PL500A」 萆諦©命外^噼Η鰣莽A岭佯雔效③莓「絲每it( )EL80F1」 萆舔® &决；5漆$噼莽A岭律滩铐a^「IDEMITSCPPJ900GP」 萆 isn JDfT ω 萆 m /^s ρΟΓ % fflfT Θ ^χα ® Ι0(Γ Θ 萆 HUT Θ 萆 Θ 萆 ※爺 53 h- h- 33 卜 h- 萆 m 1¾ FOr 避 »-* 〇\ OJ On 私 H-* H-i H-^ ON OJ On H-* v〇 孩 〇° H—^ Η-* 00 U\ to to <1 1-* 私 H-^ 一 On H-^ U) 私 C)cr o to h"* U) o 00 O to H-^ 〇 m 5满 ϋ- 二 to OJ 00 o OJ to \禪 【ΐ】 (請先閲讀背面之注意事項再填寫本頁)Va: apparent volume of the foam (cm3) calculated from the external dimensions of the foam used in the measurement W: total weight (g) of the foam used in the measurement Density (g / cm3) of the substrate resin of the foam. In addition, the paper size applies to the Chinese National Standard (CNS) A4 (210 X 297 mm) 1227255 A7 B7 V. Description of the invention (14) The paper size applies to China Standard (CNS) A4 specification (210X297 mm) ※ One sound of «Congratulations · All promises> > > 3 effects ^" 1 " —81 私 "Sound of sound Θ &涞; 5 Ling Liao 雔 a ^ r ioemitsc PP J700GP "Congratulations ΘE-3n ^ (4vm ^ 丨) Recklessly 蛉 Poverty Shackle a ^「 E-3ll ^ () PL500A 」萆 谛 © 命 外 ^ 噼 Η 鲥 羞 A Ridge effect ③ berry "silk every it () EL80F1" 萆 licking ® &decision; 5 lacquer $ 噼 A ridge law beach shackle a ^ "IDEMITSCPPJ900GP" 萆 isn JDfT ω 萆 m / ^ s ρΟΓ% fflfT Θ ^ χα ® Ι0 (Γ Θ 萆 HUT Θ 萆 Θ 萆 ※ 爷 53 h- h- 33 hh- 萆 m 1¾ FOr Avoid »-* 〇 \ OJ On Private H- * Hi H- ^ ON OJ On H- * v 〇 童 〇 ° H— ^ Η- * 00 U \ to to < 1 1- * Private H- ^ 一 On H -^ U) private C) cr o to h " * U) o 00 O to H- ^ 〇m 5 full ϋ- two to OJ 00 o OJ to \ zen 【ΐ】 (Please read the notes on the back before filling (This page)
17 1227255 A7 B7 五、發明説明（l5 ) 比較例4 比較例3 比較例2 比較例1 實施例14 實施例13 實施例12 實施例11 實施例10 實施例9 實施例8 實施例7 實施例6 實施例5 實施例4 實施例3 實施例2 實施例1 樹脂① 樹脂① 樹脂① 樹脂① 樹脂① 樹脂① 樹脂① 樹脂① 樹脂① 樹脂① 樹脂① 樹脂① 樹脂① 樹脂① 樹脂① 樹脂① 樹脂① 樹脂① 樹脂 _LA) 樹脂④ 樹脂③ 樹脂③ 樹脂③ 樹脂⑤ 樹脂⑤ 樹脂⑤ 樹脂⑤ 樹脂⑤ 樹脂⑤ 樹脂⑤ 樹脂② 樹脂② 樹脂② 樹脂② 樹脂② 樹脂② 樹脂② 樹脂 _(B) 〇 U) U\ έ U) U) 〇 樹脂(A):樹脂 (B)(重量比） § § g 〇 § g § § 〇 to 〇 to 〇 K) 〇 to 0.19 0.27 0.18 0.19 0.28 0.26 0.26 ο h—* ο ίο 〇 Κ) 〇 K) 〇 K) 〇 k) 〇 to 裳I to to K) 1—^ to U) to K) to 00 L) 1.44 »—a On Ο H-A 〇 〇〇 ►—a »—A ίο b b 0.83 0.83 0.83 184 185 185 185 179 174 177 177 176 176 177 179 176.5 177 1 177 177 177 177 發泡溫度 rc) 一 U) 00 U) U\ U\ Ln 3險 d陶 102 102 102 102 106 106 109 107 108 106 106 102 102 102 102 102 102 102 擠壓量 (kg/hr) >2】 (請先閲讀背面之注意事項再填寫本頁) 、tr— 本紙張尺度適用中國國家標準（CNS) A4規格（210X297公釐） 18 1227255 A7 B7 五、發明説明（16 ) 所獲得之發泡片材每lm2之重量（坪量），片材寬度、平 均厚度、表觀密度、獨立氣泡率、在140°C之拉伸屈服點強 度，以及Ng值示於表3。 本紙張尺度適用中國國家標準（CNS) A4規格（210X297公釐） 19 (請先閲讀背面之注意事項再填寫本頁)17 1227255 A7 B7 V. Description of the invention (15) Comparative example 4 Comparative example 3 Comparative example 2 Comparative example 1 Example 14 Example 13 Example 12 Example 11 Example 10 Example 9 Example 8 Example 7 Example 6 Example 5 Example 4 Example 3 Example 2 Example 1 Resin ① Resin ① Resin ① Resin ① Resin ① Resin ① Resin ① Resin ① Resin ① Resin ① Resin ① Resin ① Resin ① Resin ① Resin ① Resin ① Resin ① Resin ④ Resin ④ Resin ③ Resin ③ Resin ⑤ Resin ⑤ Resin ⑤ Resin ⑤ Resin ⑤ Resin ⑤ Resin ⑤ Resin ② Resin ② Resin ② Resin ② Resin ② Resin ② Resin ② Resin _ (B) 〇U) U \ έ U) U) 〇 Resin (A): Resin (B) (weight ratio) § § g 〇§ g § § 〇to 〇to 〇K) 〇to 0.19 0.27 0.18 0.19 0.28 0.26 0.26 ο h— * ο ο 〇Κ) 〇K) 〇K) 〇k) 〇to clothes I to to K) 1— ^ to U) to K) to 00 L) 1.44 »—a On 〇 HA 〇〇〇►—a» —A ίο bb 0.83 0.83 0.83 184 185 185 185 179 174 177 17 7 176 176 177 179 176.5 177 1 177 177 177 177 Foaming temperature rc) one U) 00 U) U \ U \ Ln 3 ceramic 102 102 102 102 106 106 109 107 108 106 106 102 102 102 102 102 102 102 Squeeze (kg / hr) > 2] (Please read the precautions on the back before filling this page), tr— This paper size applies to China National Standard (CNS) A4 (210X297 mm) 18 1227255 A7 B7 5 、 Explanation of the invention (16) The weight per lm2 of the obtained foamed sheet (flat weight), sheet width, average thickness, apparent density, closed cell ratio, tensile yield point strength at 140 ° C, and Ng The values are shown in Table 3. This paper size applies to China National Standard (CNS) A4 (210X297 mm) 19 (Please read the precautions on the back before filling this page)
1227255 A7 B7 五、發明説明（17 ※2 ItMM#琴A and 〇濘岑>>3~^©瀚(^丫：/〇>)觚靜险钵吝^鏐象-雔綠：1^1^-曰-500 ^© 錄 a 渺贫^鰣商^¾^ 陸許·· TLF-5-40B -滩砾^綠：20. 8569淨衅箨%。 比較例4 比較例3 比較例2 比較例1 實施例14 實施例13 實施例12 實施例11 實施例10 實施例9 實施例8 實施例7 實施例6 實施例5 實施例4 實施例3 實施例2 實施例1 因發泡片材於製造時發生破裂情形故而未予測定。 355 358 373 254 287 281 251 304 293 287 405 365 | 362 402 _1 414 358 416 # 1—^ 3 N 巴八 litnU w _ 發泡片材 1.36 h—^ U) U) 1—^ U) 1—^ Lk) 1— ίο *<1 1—^ U) to 1—^ b\ iri k) H-^ — Lh 1.42 U) NJ 00 o 1—* to 00 平均厚度 (mm) 265 273 281 225 226 215 207 182 190 231 252 257 268 279 321 321 321 表觀密度 -(g/L) 712 712 705 1044 1043 710 h—^ 709 714 717 715 715 717 715 717 715 715 寬度 (mm) 00 <1 〇〇 〇〇 Os to 〇〇 U) 00 00 g 00 Lh 00 oo 00 00 K) 獨立氣泡率 _(%) 00 σ\ Lh bo U\ 1—^ U\ U\ ON η-a to <1 oo k) oo ih <1 U) 00 擠壓方向 拉伸屈服點強度(N)※2 U\ U) U) b U\ On Lh 4^ Lo bo U\ Os 1/1 H-^ 1/1 00 U) 00 <ϊ On 00 U\ 寬度方向 192 182 155 177 199 192 179 161 174 192 151 197 207 204 ] 205 204 202 擠壓方向 Ng 值(N/g)xl(T4 149 148 134 177 195 196 1—^ 158 174 188 160 195 207 206 205 212 204 寬度方向 【>3 (請先閲讀背面之注意事項再填寫本頁) 、τ 本紙張尺度適用中國國家標準（CNS) A4規格（210X297公釐） 20 1227255 五、發明説明（is ) 在只知例1〜14，由於結晶化物並未發生，而且可以使 擠壓溫度降低至177°C(在實施例6係降至l76.5t：，在實施 例7與貫施例19係降至179°C，在實施例8與實施例1〇係降至 176 C，而在實施例13則降至174°C )，因而可以獲得獨立氣 泡率高之發泡片材。此點被認為是樹脂相對於樹脂 (A)，其熔體流動率相當大，熔點高且結晶化溫度相當低而 造成者。另一方面，在比較例1〜3中，由於使擠壓溫度降 低至1 84°C，所獲得之發泡片材中就會發生結晶化物，故而 判斷185°C為其冷卻的極限。其結果，在比較例i〜3所獲得 之發泡片材’成為獨立氣泡率低的產物。而，在比較例4， 樹脂（B)之結晶化溫度高，而且無法使擠壓溫度充分地降 低，結果，將剛擠壓後的管狀發泡體展開時會發生破裂的 情形。 接者’對分別在實施例1〜14所獲得的發泡片材，以加 熱器將其兩面加熱使之軟化後，利用柱塞加速（plug assist) 真空成形法，以成形為具有開口部直徑170 mm、底部直徑 150 mm、深度30 mm之圓形收納部的盤為目標時，可以獲 得模型之產出準確的良好的成形品（盤）。 其次，對分別在比較例1〜3所獲得的發泡片材，和實 施例1〜3同樣地，以加熱器將其兩面加熱使之軟化後，利 用柱塞加速（plug assist)真空成形法，以成形為具有開口部 直徑170 mm、底部直徑150 mm、深度30 mm之圓形收納部 的盤為目標時，無法依照模型，而僅能獲得難謂為成形品 之產物。 21 本紙張尺度適用中國國家標準（CNS) A4規格（210X297公釐〉 1227255 A7 B7 五、發明説明 【發明的效果】 如以上所說明，本發明之聚丙烯系樹脂擠壓發泡片材 係以’在230°C之熔體張力為1〇 cN以上之聚丙烯系樹脂 (A)15〜70重量％，和在230°C之熔體張力為5cN以下之聚丙 烯系樹脂（B)85〜30重量％(但是’聚丙烯系樹脂（A)+聚丙烯 系樹脂（B)= 100重量％)的混合物做為基材樹脂，且因高價 的樹脂（A)之使用量可以被抑低為少量，故而可以減低成 本。另’本發明之聚丙烯系樹脂擠壓發泡片材儘管含有發 泡性差之樹脂（6)30重量％以上，被發泡成15〇〜75〇 g/ L之 表觀搶度’但是獨立氣泡率在5〇%以上，故而可以發揮得 到模型的產出優良之熱成形品的效果。 【圖式之簡單說明】 【第1圖】 攸溶體張力測试機的贺嘴將樹脂呈繩狀擠壓出來，以 一定的捲取速度將繩狀樹脂用滾筒予以捲取時之熔體張 力：MT之經時變化的示意圖。 本紙張尺度適用中國國家標準（CNS) A4規格（210X297公爱） 221227255 A7 B7 V. Description of the invention (17 ※ 2 ItMM # 琴 A and 〇 泞 岑 > > 3 ~ ^ © 瀚 (^ 丫: / 〇 >) 觚 静 危 吝 吝 镠 象-雔 绿: 1 ^ 1 ^ -say-500 ^ © Record a poor ^ 鲥 商 ^ ¾ ^ Lu Xu ·· TLF-5-40B-beach gravel ^ green: 20. 8569 net 箨%. Comparative Example 4 Comparative Example 3 Comparative Example 2 Comparative Example 1 Example 14 Example 13 Example 12 Example 11 Example 10 Example 9 Example 8 Example 7 Example 6 Example 5 Example 4 Example 3 Example 2 Example 1 The material has not been measured during the manufacturing process. 355 358 373 254 287 281 251 304 293 287 405 365 | 362 402 _1 414 358 416 # 1— ^ 3 N 巴 八 litnU w _ foamed sheet 1.36 h— ^ U) U) 1— ^ U) 1— ^ Lk) 1— ίο * < 1 1— ^ U) to 1— ^ b \ iri k) H- ^ — Lh 1.42 U) NJ 00 o 1— * to 00 Average thickness (mm) 265 273 281 225 226 215 207 182 190 231 252 257 268 279 321 321 321 Apparent density- (g / L) 712 712 705 1044 1043 710 h— ^ 709 714 717 715 715 717 715 717 717 715 715 Width (mm) 00 < 1 〇〇〇〇Os to 〇〇U) 00 00 g 00 Lh 00 oo 00 0 0 K) Independent bubble rate _ (%) 00 σ \ Lh bo U \ 1— ^ U \ U \ ON η-a to < 1 oo k) oo ih < 1 U) 00 Tensile yield point in extrusion direction Intensity (N) * 2 U \ U) U) b U \ On Lh 4 ^ Lo bo U \ Os 1/1 H- ^ 1/1 00 U) 00 < ϊ On 00 U \ width direction 192 182 155 177 199 192 179 161 174 192 151 197 207 204] 205 204 202 Extrusion direction Ng value (N / g) xl (T4 149 148 134 177 195 196 1— ^ 158 174 188 160 195 207 206 205 212 204 width direction [> 3 (Please read the notes on the back before filling this page), τ This paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm) 20 1227255 V. Description of the invention (is) In the only known examples 1 ~ 14 Since the crystallization does not occur, and the extrusion temperature can be reduced to 177 ° C (in Example 6 to 176.5t :, in Example 7 and in Embodiment 19, it is reduced to 179 ° C, in the implementation Example 8 and Example 10 were reduced to 176 C, while in Example 13 it was reduced to 174 ° C.), and thus a foamed sheet having a high closed cell ratio was obtained. This is considered to be caused by the fact that the resin has a relatively large melt flow rate, a high melting point, and a relatively low crystallization temperature relative to the resin (A). On the other hand, in Comparative Examples 1 to 3, since the extrusion temperature was lowered to 1 84 ° C, crystals were generated in the obtained foamed sheet, and therefore, the cooling limit of 185 ° C was judged. As a result, the foamed sheet material 'obtained in Comparative Examples i to 3 was a product having a low closed cell ratio. On the other hand, in Comparative Example 4, the resin (B) had a high crystallization temperature, and the extrusion temperature could not be sufficiently lowered. As a result, the tubular foam immediately after extrusion was cracked. Then, the foamed sheets obtained in Examples 1 to 14 were heated by a heater to soften both sides, and then formed using a plug assist vacuum forming method to form an opening diameter. When a disk with a circular storage portion of 170 mm, a bottom diameter of 150 mm, and a depth of 30 mm is targeted, a good molded product (disk) with accurate output of the model can be obtained. Next, the foamed sheets obtained in Comparative Examples 1 to 3 were heated by a heater to soften both sides in the same manner as in Examples 1 to 3, and then plug-assisted vacuum forming method was used. When a disk formed with a circular receiving portion with a diameter of 170 mm at the opening, a bottom diameter of 150 mm, and a depth of 30 mm is targeted, it is impossible to follow the model, and only a product that is difficult to describe as a molded product can be obtained. 21 This paper size is in accordance with Chinese National Standard (CNS) A4 (210X297 mm) 1227255 A7 B7 5. Description of the invention [Effects of the invention] As explained above, the polypropylene resin extruded foamed sheet of the present invention is based on 'The polypropylene resin (A) with a melt tension at 230 ° C of 10 cN or more is 15 to 70% by weight, and the polypropylene resin (B) with a melt tension at 230 ° C of 5 cN or less is 85 to 30% by weight (but the mixture of polypropylene resin (A) + polypropylene resin (B) = 100% by weight) is used as the base resin, and the amount of expensive resin (A) can be reduced to A small amount can reduce the cost. In addition, the polypropylene-based resin extruded foamed sheet of the present invention is foamed to 15 to 75 g / L even though it contains 30% by weight or more of the resin (6) with poor foamability. Apparent rush rate, but the independent bubble rate is more than 50%, so it can exert the effect of obtaining a thermoformed product with a good output of the model. [Simplified description of the drawing] [Figure 1] Ethanol solution tension testing machine The mouthpiece extrudes the resin in a rope shape, and the rope resin is extruded at a certain winding speed. Melt tension when coiled by a roller: a schematic diagram of the change of MT over time. This paper size applies the Chinese National Standard (CNS) A4 specification (210X297 public love) 22