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滾塑的發展DEVELOPMENT OF ROTOMOULDING

滾塑是一種成型中空塑料制品的工藝方法,也稱旋轉成型或旋轉模型。將塑料粉末加入模具中,然后加熱模具并使之沿兩相互垂直的軸連接旋轉,模具內樹脂在重力和熱量的作用下逐漸均勻地涂面、熔融黏附于模具內表面上,形成所需要的形狀。然后冷卻模具,脫模得到制品。滾塑工藝相對于塑料成型經常采用的擠出、注塑和吹塑等工藝而言,具有設備和模具投資少、適合于大中型或形狀復雜塑料制品的生產、產品幾乎無內應力等優點。

Rotomoulding is the technique for producing hollow plastic products.The first step is to put plastic powder into molders,then heat the molder to make the powder revolve around two vertical axes.The resin within the molder starts to pave the surface evenly due to the weight and heat followed by meltingon the inner surfface of molder.the second step is to cool down the molders and remove from the molder to get the products. Compared with what the plastic forming always take such as extrusion,injection,and blowing,the rotomoulding enjoys the advantage of small investment,excellent application for medium-and-super sized plastic products in complicated structures,and no stress,etc.

滾塑模具ROTATIONAL MOLDING

滾塑原料RAW MATERIALS OF ROTOMOULDING

線性低密度聚乙烯(LLDPE)是最理想的滾塑原料。LLDPE 是乙烯與丁烯、乙烯等的共聚物,分子呈線型結構,密度為0.93g/cm3。LLDPE用于滾塑的優點在于流動性好、熱穩定性好、耐環境應力開裂性好、抗沖擊性能好、剛性好。

LLDPE(Low Linear Density Polyethylene)is the ideal raw materials for rotomoulding.LLDPE is the copolymer of polythene,butylenes and so on with the linear molecule and the density of 0.93g/cm3.The advantage of LLDPE is it is better in liquidity,thermal stabilization and ESCR<impact, and hardness.


滾塑所采用的原料一般均為進口,我們采用樂天、美孚為主。除常用的顏色自己配色外,其余最好采用專門色料供應商的原料,如馬來西亞 ICO及南京聚隆等,能調配耐強紫外線、抗強氧化性、甚至阻燃等專用料。

Rotational molding of raw materials used in general are imported, we use Le Tian, Mobil. Besides the common color your own color, the best use special pigment suppliers of raw materials, such as the Malaysia ICO and Nanjing Julong, special material blending resistant to ultraviolet, anti oxidation, and flame retardant.

原料物理性能表 / Material Physical Properties List

性能 試驗方法 單位 樂天LPC L社(普通原料)SR
主軸中心高 ASTM D1238 g/10min 5.0 4.5
密度 ASTM D1505 g/cm3 0.935 0.932
密度調節劑 - - - - C4 C4
屈服點抗張強度 ASTM D638 kg/cm2 165 140
彎曲彈性率 ASTM D790 kg/cm2 7,000 6,400
Izod沖擊強度(23°) ASTM D256 kg.cm/cm 49 25
耐環境應力龜裂性 ASTM D1693 hr >500 <500
軟化點 ASTM D1525 °C 113 110
熱變形溫度 ASTM D648 °C 57 54
粉末流動性 ASTM D1895 Sec/95g 22 28
UV等級 - - - - >UV-8 <UV-8
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