Trouble_Shooting_Guide_for_Injection_Molding_Part1_注塑问题解决手册_(上).pdf

01 Dull spots 01 斑点斑点(乌点乌点) 斑点斑点 乌点乌点 Alternative terms: Matt patches 别名: 消光区域 Description: Uniform, clearly defined velvety areas on surface 描述: 制品表面上均匀的、清晰可见的绒面状区域 Possible causes: 1 Disturbed melt flow in gating system or near gate 1.1 Flow fronts with different velocities (with several gating points) 2 Tearing of already solidified outer skin at sharp bends and abrupt changes in wall thickness 可能的原因 1 浇注系统中或靠近浇口处出现不规则熔料流 1.1 不同速度的流动前锋 (多个浇口) 2 急拐弯处和壁厚突变处已固化的外层料被撕裂 Remedial actions: 1 Modify gate; start by injecting material slowly, 解决的措施 then switch to a faster speed 1.1 Even out differences in flow front velocities by improving the balance of the gating system (where several feed points are involved) 2 Round off or polish transition zones and abrupt changes in wall thickness in the runner and mould; balance flow front velocities 1 修改浇口；采用先慢后快的充模方式 1.1 通过均衡流道系统来减少不同流动前锋的速度差(多个浇口) 。 2 流道系统和模腔中的过渡区和壁厚突变区进行渐变处理或抛 光处理 Notes: See also 29: Flaking 注释： 也可参看第29 项：剥落 Fault category: Gloss / Streaking 02 Matt surface defects near hot runner units 02 靠近热流道单元的消光表面缺陷靠近热流道单元的消光表面缺陷 靠近热流道单元的消光表面缺陷靠近热流道单元的消光表面缺陷 Description: Rough, torn and therefore matt-effect surface near hot runner units or hot cores 描述 ： 靠近热流道单元或热型芯处 ，由于表面粗糙或撕裂而导致的