Shanghai Daoqin Plastics Co., Ltd.

        免 spray coating color process large difficulty/challenge

        1, material versus for easy degradation

         due to resin in add 特殊颜 material, metal material and other, in material processing process in, in temperature degree and force function lower, metal color easy catalytic agent function, 引起材 material degradation, formed products surface generate gas or silver streaks, is surface gas and material degradation and other defect phenomenon.

        2, metal material easy 沿剪切 direction 排布

         injection speed degree high formed large, metal material will 沿 剪切 direction 进行排布, make product surface generate 熔接痕 and flow marks, effect/influence product appearance.

        免 spray coating color 7 types solutions

        1, selection combined aluminum powder

         using/adopting 规则 球 type aluminum powder for light 线 反射 relatively is uniform 一致, main/primary 发生镜面反射, surface tool has high degree and gloss degree. using/adopting sheet/slice and type aluminum powder 时, due to 形状不规则, material in material distribution 形态各异, light in aluminum powder surface direction same, 导致目视观察时 generate dark 差异, 变换观察角 degree 时, generate 闪烁效果.

         generally 而言, aluminum powder 形状越不规则, dimensions large, its 闪烁效果越 obvious. aluminum material content increase, color add deep, generally add scope/range is 1%-4%.

        2, combined 理 颜 material formulation combined

         using/adopting versus property good and can increase flow property additives, ensure material and resin separation mixed combined and distribution.

        3, control water separation content

         large more resin absorption gas in water 汽, in molding processing front must drying, can can products surface silver streaks and water and effect/influence products surface gloss. usually requirements drying rear water amount control in 0.05% below/following. 例如, for/regarding ABS基材, drying temperature degree usually is 70°C-85°C, drying 3-4 small 时.

         drying temperature degree high easy 引起材 material property can reduce; drying temperature degree low, drying time 不够, resin moisture content high, products surface easy generate gas 痕.

        4, injection molding temperature degree - selection in low temperature

         due to add metal material, in screw high function lower, easy metal material color. therefore, resin molding temperature degree 设置原则 is: in ensure material separation front lower, amount use in low temperature degree injection molding, anti material degradation. 例如, 以ABS is product processing temperature degree is 210°C-230°C.

        5, injection molding speed degree - in speed separation 段阶梯式 control

         in injection molding 时, selection injection molding speed degree main/primary products appearance, mold gas and injection molding machine type inner resin flow retardant force. relatively fast injection molding speed degree generally make process/workflow add long, combined thin products, formed relatively good surface light degree and surface 效果.

        但 fast injection molding speed degree easy make 熔胶遭受 strong/high 剪切, 导致珠 light color powder and 粒径发生破 bad reduce products color color 效果. another, gate 附近容 easy 出现喷射痕, gas defect and other.

         therefore, in ensure product surface and quality front lower, selection in speed separation 段阶梯式 speed degree control, ensure 充填顺畅 and products appearance.

        6, injection pressure - selection relatively low injection pressure

         injection pressure is is melt in flow process in retardant force, to melt 一定 充填 speed degree and for melt pressure 实, shrink, ensure process 顺利进行. injection molding pressure many amount has 关, 如: melt temperature degree, mold temperature degree, made parts 几何形状, thick, flow long degree, and its it mold and equipment 情况.

         usually, most good selection can meet/satisfy property can, appearance and injection molding ring relatively low pressure. meanwhile need 关注实际 injection molding value pressure and setting value 差异. generally lower, combined holding pressure pressure is injection pressure 60-80%.

        7, relatively high mold temperature degree

         mold temperature degree effect/influence most products surface light degree, weld lines and its strong/high degree and other.

         use high mold temperature degree can increase material flow property, obtain relatively high combined strong/high degree, and can reduce molding products internal stress, make its heat resistant property and chemical resistant product property more good, meanwhile 提髙熔胶 for mold surface made property, products gloss degree and color color 效果.

         is to surface quality 效果, in use metal material 时, amount using/adopting relatively high mold temperature. for/regarding ABS as is product, mold temperature usually is 70-90°C.