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腹肌是常用的塑料注塑材料具有三种主要成分：丙烯腈，丁二烯和苯乙烯。这些单体中的每一个都赋予特定特性，并提供具有强大特征组合的ABS Terpolymer。ABS，丙烯腈中的“ A”赋予硬度，热和耐化学性。代表丁二烯的“ B”提供了韧性和抗冲击力。苯乙烯的“ S”具有光泽，强度和加工性。
ABS塑料的购买相对便宜，并且相对易于注射模具。它通常用于消费品和电子组件，但不是户外应用的最佳选择，因为它缺乏对阳光和天气的强烈抵抗力。但是，ABS确实支持使用添加剂，从而增加其对紫外线（UV）光的耐药性。填充材料也可以添加到注射模压的ABS中，以增加强度。填充材料包括玻璃, nylon, acrylic, and stainless steel fibers.
Additives and fillers can affect processing parameters, however, and different grades of ABS may contain different combinations of acrylonitrile, butadiene, and styrene. That’s why it’s important to partner with an ABS injection molder who understands more than just the advantages and applications for this popular plastic. The material properties of ABS and the way that it’s processed are critical to the success of your project.
材料特性
像其他注入的模制塑料一样，ABS可以用typical material properties. Two physical properties, mold shrinkage and water absorption, are especially important because of their relationship to drying and processing. There are also injection properties that molders need to consider in order to avoid part defects.
The table below provides typical values for a generic ABS material containing glass beads.
| 身体的 | Nominal Value |
| 霉菌收缩 - 流（73°F） | 4.0e-3*至7.0e-3 **英寸 |
| Water Absorption (24 hr., 73° F) | 0.16 to 0.25% |
| 机械的 | |
| Tensile Modulus (73° F) | 3200 to 500 kpsi |
| 拉伸伸长（断裂，73°F） | 2.0 to 10% |
| Flexural Modulus (73°F) | 348至426 kpsi |
| 弯曲强度（73°F） | 7150 to 9100 psi |
| Injection | |
| Drying Temperature | 176 to 180 F |
| Drying Time | 2.0至9.0小时。 |
| 熔体温度 | 410° to 500° F |
| 霉菌温度 | 113° to 175° F |
*4.0e-3 = 4.0 x 10-3= 0.0040
** 7.0e-3 = 7.0 x 10-3= 0.0070
Material Processing Concerns
正如上表中的吸水值所显示的，ABS倾向于吸收水分。因此，一定是完全干燥在处理之前，这增加了时间和成本 - 但是无法去除水分可能会导致模制的零件，气泡或表面线。如果您的零件需要高光泽，反射性的表面高，则可能需要超过9个小时的干燥时间。
粘度
熔体温度是另一个重要的处理考虑因素，因为它与粘度的关系是液体对流动性的抗性的量度。如果腹肌pellets are melted beyond their plasticizing temperature, viscosity increases and the material becomes more difficult to mold. This behavior differs from other amorphous plastics, where viscosity decreases beyond the plasticization, or processing, temperature.
温度控制
腹肌that is overheated is also subject to thermal decomposition, the heat-induced breakdown of chemical bonds. Brown granules on injected molded parts mean the molding occurred at excessive temperatures, which is often caused by old equipment with poor temperature control. For injected molded ABS parts with higher gloss, however, higher molding temperature must be maintained without damaging the material. The temperature of the mold itself is also higher with ABS than with other commonly used materials.
注射压力
Because of ABS’s viscosity, higher injection pressures are needed than for many other materials, but lower pressures may still be suitable for smaller, simpler, or thicker products. Just bear in mind that if the injection pressure is too high, increased friction can cause molded parts to stick, which complicates their removal and adds to production costs. If the pressure is too low, mold shrinkage increases and can result in out-of-tolerance parts that won’t meet end-use requirements.
Injection Speed
Injection molding速度是另一个重要的处理考虑。如果速度太快，ABS塑料可能会燃烧或热分解。结果可能包括焊接线，光泽度和变色等缺陷。但是，如果注塑速度太慢，则模具的填充可能不足。为了提高尺寸稳定性，ABS所需的射击大小比其他塑料少。这减少了材料使用情况，但仍需要适当的处理技术。
Succeeding with ABS Injection Molding
ABS是一种常用的注塑塑料,but that doesn’t mean just any manufacturing partner can produce the parts you need. Many injection molders can describe its advantages and applications, but don’t understand ABS’s material properties and processing considerations. And you don’t want to deal with the added processing costs, risk and part defects that come with inadequate drying or improper processing methods.Fictiv has the resources, experience, knowledge and production network to deliver the parts you need, fast.Create an account今天就立即获得报价！
