烧焦是指在注塑加工过程中由于模具排气不良或注射太快，模具内的空气来不及排出，则空气会在瞬间高压下急剧升温，而将熔体在某些位置烧黄烧焦的现象。那么怎么去呢？
Charring refers to the phenomenon that the air in the mold cannot be discharged due to poor exhaust or injection too fast in the process of injection molding, and the air will heat up rapidly under the instant high pressure, and the melt will be burnt yellow and charred in some positions. So how to solve it?
末端注射速度过快：降低比较靠后的一级注射速度。
Too fast terminal injection speed: lower the injection speed of the lower first stage.
模具排气不良：加大或增开排气槽（抽真空注塑）。
Poor exhaust mold: increase or open exhaust groove (vacuum injection molding).
注射压力过大：减小注射压力（可减轻压缩程度）。
Injection pressure is too high: reduce the injection pressure (can reduce the compression degree).
熔料温度过高（黏度降低）：降低熔料温度，降低其流动性。
The temperature of the melt is too high (viscosity is reduced) : the temperature of the melt is reduced and its fluidity is reduced.
浇口过小或位置不当：改大浇口或改变其位置（改变排气）。
Gate too small or improperly positioned: change the gate or change its position (change the exhaust).
塑胶材料的热稳定性差（易分解）：改用热稳定更好的塑料。
Poor thermal stability of plastic materials (easy to decompose) : switch to plastic with better thermal stability.
可能是溶体破裂导致烧焦，当熔体在高速，高压条件下注入容积较大的型腔时，极易产生熔体破裂现象，此时，熔体表面出现横向断裂，断裂面积为粗糙地夹杂在塑件表层形成糊斑。特别是少量熔料直接注入容易过大的型腔时，熔体破裂更为严重，所呈现的糊斑也就越大。
When the melt is injected into the cavity with large volume at high speed and high pressure, it is easy to produce the phenomenon of melt rupture. At this time, transverse fracture occurs on the surface of the melt, and the fracture area is coarsely mixed in the surface of the plastic parts to form paste spots. Especially when a small amount of melt is directly injected into the cavity which is easy to be too large, the melt rupture will be more serious and the paste spot will be bigger.
济南注塑加工成型条件控制不当导致烧焦一般情况下，层流形成的塑件表面较为光亮平整，紊流条件下形成的塑件不仅表面容易出现糊斑，而且塑件内部容易产生气孔。因此，注射速度不能太高，应将流料控制在层流状态下充模。如果熔料的温度太高，容易引起熔料分解焦化，导致塑件表面产生糊斑。
Ji 'nan injection molding conditions caused by improper control of burning in general, laminar flow formed the surface of the plastic parts is bright and smooth, turbulent flow conditions formed under the plastic parts are not only easy to appear on the surface of the paste spot, but also easy to produce pores in the plastic parts. Therefore, the injection speed should not be too high, and the flow material should be controlled in the laminar flow state. If the temperature of the melt is too high, it is easy to cause the decomposition and coking of the melt, resulting in paste spots on the surface of the plastic parts.
Ji 'nan injection molding process in the burning problem to the end of this explanation, if you have other problems to understand, you can come to our website www.sdlqmj.com consultation!
