This shampoo filling machine handles hair oil, hair serum, shampoo, conditioner, body wash, liquid soap, lotion, hair-care liquid, and other flowing or moderately viscous personal-care products. The four tracking filling heads follow bottles along the conveyor during filling. After dosing, the line feeds and tightens caps, applies labels, prints production information, changes the bottle direction when required, and sends finished bottles to the shrink-packing section. The reference machine specifically targets hair oil, conditioner, shampoo, and similar viscous liquids.