3. How to get the good appearance for Custom ABS injection molded parts?
The main reasons for the bad appearance of plastic molded parts are mold, the injection molding process, and raw materials.
As a professional ABS injection molding manufacturer, we make the following details on this topic.
Please correct us if we are wrong; we will learn together!
3.1) Plastic injection molds
3.1.1 If the mold cavity manufactuirng is poor, such as scars, microporous, wear, roughness and other deficiencies, will inevitably react to the plastic parts, so that the plastic parts appearance is not good, for this, to carefully build the mold, make sure the surface of the cavity has a small roughness, if necessary, polishing chrome plating for custom ABS plastic injection molding .
3.1.2 If the surface of the cavity has oil and water stains, or the mold release agent makes too much, it will make the surface of the plastic part dark and lusterless. In this regard, we should remove the oil and water stains in time, and use the mold release agent in a limited amount for custom ABS plastic injection molding . .
3.1.3 If the product draft angle is too small, it is difficult to demolded, or the demolded force is too large when eject the parts out, so that the surface of the plastic parts is not shiny, in this regard, we should increase product draft angle during DFM stage.
As a professional Custom ABS plastic injection molding supplier, we will make the details DFM report to Analyze the customer’s design.
3.1.4 If the mold venting system is bad, too much gas stays in the model, which also leads to bad appearance, for this, check and correct the mold venting system system for custom ABS plastic injection molding ..
Our mold reviewing checklist requires every our mold designer to carefully examine the mold venting system.
3.1.5 If the gate or runner cross-sectional area is too small or suddenly changed during melting flow , the melt flowing in which the shear force is too large, is turbulent dynamic flow, resulting in poor luster, in this regard, should be appropriate to increase the gate and runner cross-sectional area for custom ABS plastic injection molding ..
Most injection molding suppliers do not pay attention to this point, we have professional mold flow analysis engineers to analysis the gate and runner dimensional for you plastic injection molding project.
3.2) injection molding parameters
3.2.1 If the injection speed is too small, the surface of the plastic part will not be dense and show poor appearance during custom ABS plastic injection molding .
3.2.2 For thick-walled plastic parts, if the cooling is not sufficient, the surface will be hairy and the luster will be dark, in this regard, the cooling system should be improved during custom ABS plastic injection molding .
3.2.3 If the holding pressure is not enough and the holding time is short, the density of the plastic part is not enough and the luster is not good, for this, the holding pressure and holding time should be increased during custom ABS plastic injection molding .
3.2.4 If the melt temperature is too low, which makes the liquidity poor and leads to bad appearance, the melt temperature should be increased appropriately during custom ABS plastic injection molding .
3.2.5 If the injection speed is too large and the gate cross-sectional area is too small, the vicinity of the pouring product will be dark and bad luster, in this regard, the injection speed can be properly reduced and the gate cross-sectional area increased during custom ABS plastic injection molding .
3.3) Plastic Raw Materials
3.3.1 The plastic granule size of raw materials varies greatly, which makes it difficult to melt evenly and makes the appearance bad; the raw materials should be sieved before starting ABS injection molding.
3.3.2 Too much recycled material or sprue material is added to the raw material, which affects the uniform melting and makes the appearance bad, so the ratio of adding recycled material or sprue material should be reduced before custom ABS injection molding .
The plastic injection molding manufacturer should not add overmuch recycled materials or sprue materials into the raw plastic materials, Remember, the plastic injection molding factory should put quality in the first place.
3.3.3 The content of moisture or volatile matter in raw plastic materials is too high, and evaporates into gas when heated, and condenses in the mold cavity, resulting in poor appearance on plastic parts, so the raw plastic materials should be pre-drying treatment a few hours before ABS injection molding.
3.3.4 The dispersion of additives is too slow to lead to poor appearance on plastic parts, in this regard, should be replaced the additives with better flowability before custom ABS injection molding.
3.3.5 There are foreign materials, miscellaneous materials or insoluble materials mixed in the raw material, they can’t be mixed with the raw material evenly and lead to bad appearance, in this regard, these miscellaneous materials should be strictly excluded beforehand.
3.3.6 If the amount of lubricant is too little, the fluidity of the melt is poor, and the surface of the plastic part is not dense, which makes the luster bad, for this, the amount of lubricant should be increased appropriately before custom ABS injection molding .