WILPAC Crop Protection Packaging Lines: Chemical-Resistant Filling, Leak-Proof Sealing and Water-Soluble Film Pouches

A crop protection line is judged by what leaks, not by what it fills. Emulsifiable concentrates soften standard nitrile seals within weeks, suspension concentrates settle and abrade pump internals, and soluble liquids leave a film at the bottle mouth that defeats an induction seal. Add the export reality of a container crossing two climate zones and the failure shows up as a stained carton at the destination, months after the machine was signed off. WILPAC designs these lines around containment rather than around speed: chemically compatible wetted parts, drip-free filling nozzles, sealing integrity verified on the line, and film handling that does not stress the pouch beyond its limit.

Dosing is weight based instead of volumetric, which matters because formulation density shifts between batches and because a 100 ml bottle tolerates far less absolute error than a 5 kg bag. WILPAC lines cover 100 ml to 1 L bottles, 1 to 5 L containers and 10 to 20 L jerry cans on one platform, with servo driven filling, individual nozzle shut-off and in-line check-weighing. Wetted paths use 316L stainless steel, PVDF and PTFE, with peristaltic or diaphragm pumps selected by formulation rather than by convenience. Nozzles are designed to retract and wipe, so residual product returns to the supply instead of running down the bottle shoulder and into the label area.

Sealing is where crop protection packaging fails quietly. Torque controlled capping is monitored per head, induction sealing parameters are recorded per batch, and every container passes a leak or pressure test before cartoning. For unit-dose formats the line handles water-soluble film pouches, where film thickness of 40 to 60 microns leaves almost no tolerance for tension variation. Servo film pulling holds web tension constant as the roll diameter decreases, so pouch length, seal width and fill position stay stable across a full shift, and the sealing bars are temperature controlled in zones rather than as one block. That is the difference between a pouch that dissolves cleanly in the spray tank and one that bursts in the carton.

Operator safety and line availability are designed together. Filling and capping stations are enclosed with local extraction, so solvent vapour leaves through a duct instead of entering the room; electrical equipment can be specified for hazardous area classification where the formulation requires it, and washdown connections allow cleaning between product changes without dismantling the filling head. WILPAC delivers the full sequence from bottle unscrambling through filling, capping, sealing, labelling, case packing and palletising under one control system, with batch records generated automatically for registration and traceability purposes. Remote diagnostics and engineer commissioning are included, and the servo film axis is rated for continuous three-shift duty, because a crop protection line rarely gets a quiet season.