The primary considerations when choosing processing additives for semi-transparent shower curtains are high compatibility, low haze, and low migration/exudation. Prioritize preserving the original semi-transparent texture of the substrate, avoiding haziness, whitening, blooming, or oiliness. When selecting additives, first match the substrate type. The additive systems for soft PVC and PEVA semi-transparent shower curtains differ significantly. PVC requires a suitable plasticizer system, while PEVA does not require plasticizers, focusing only on processing lubrication and slip modification.

Prioritize transparent-specific ACR-type processing additives. These additives have moderate plasticizing efficiency, a refractive index that matches the substrate, and can improve melt strength and uniform plasticization without increasing haze. Avoid ordinary CPE modifiers to prevent a decrease in light transmittance. Plasticizers are only used in PVC systems. Prioritize DOTP and high-molecular-weight polyester plasticizers combined with epoxidized soybean oil, balancing environmental friendliness, migration resistance, and transparency. Avoid chlorinated paraffins and low-end phthalate small-molecule plasticizers to prevent later moisture absorption and surface stickiness.

Heat stabilizers must be transparent and compatible. Organotin stabilizers offer the best transparency and are suitable for high-end semi-transparent products. Dedicated transparent calcium-zinc stabilizers offer better cost-effectiveness and are suitable for mass production needs. Lead salt stabilizers are strictly prohibited, as they not only have poor transparency but also tend to age and yellow. Lubricants are crucial for controlling the semi-transparent effect. The principle of prioritizing internal lubrication with only trace amounts of external lubrication should be followed. Monoglycerides and polyester-type internal lubricants should be selected, with only a small amount of micronized polyethylene wax added. Stearic acid, calcium-zinc stearate, and ordinary paraffin wax are prohibited, as these materials easily cause surface whitening and a significant increase in haze.