Prestretching Mechanism TRIZ Cases

Differential-speed feed rollers tension stretch film during orbital wrapping, cutting plastic use and wrap time while air exhaust clears cling.

A pre-stretching unit and vacuum box keep film tension uniform around non-circular bundles, improving package stability and avoiding dancer-mass perturbations.

An onboard vacuum box, pump, and magnetic drive keep stretch film tension stable on a rotating wrapping ring without external manifolds.

Brake-controlled feed rollers tension stretch film during orbital wrapping to cut plastic use, speed wrapping, and keep cargo stable.

Pre-compressing palletized loads before or during stretch wrapping controls final dimensions, cuts wrap force, and reduces crushing and scuff damage.

Automatic load profiling adjusts wrap force and layer thickness for irregular pallet loads, improving containment and reducing film waste.

Varying pre-stretcher roller speeds across film width limits necking and punctures, improving bale coverage and airtight wrapping.

Uneven load shapes can cause weak containment or excess film use; scanned profiles let the controller vary wrap force and layer count by region.

Rotating feed rollers and a brake member tension film during orbital wrapping, reducing plastic use and manufacturing cost.

This case uses grippers and spacers to preserve group spacing, enabling pretensioned film to contain bundle fronts and backs.

Gripper-inserted spacers hold product groups apart while pretensioned extensible film improves containment with thinner material.

A support bar, perforation roller, and pre-stretch machine reinforce stretch film for ventilation, handling, and secure pallet containment.

Mounting encoders on the hinged door eliminates sensor resetting and damage risks while ensuring accurate film usage tracking.

Automated sensing measures wrap layers and tension to resolve the trade-off between load stability and packaging material weight.

Wrapping machine moves drive motors to the fixed frame to reduce rotating ring weight, enabling higher rotation speeds and precise film tension control.

Wrapping machine arm means grip and fold plastic film into a pleated strip to block the end flap between wrapping layers.

A cover web stretches to align with a packaging body using detected offset marks.

Replaceable intermediate gears change the gear ratio in a film packing device, eliminating the need for multiple specialized units.

Segmented unwinding system positions printed film precisely, eliminating frequent reel replacement interruptions.

Stationary motors eliminate sealed slip rings in rotating ring wrapping machines, reducing inertia and production costs.

Dynamic dispense rate adjustment using factory profiles resolves high-speed breakage by matching material supply to irregular load geometry.

Motorized hopper walls adapt to variable product dimensions, enabling automatic stacking and high-speed wrapping of unstable loads.

A mechanical linkage couples rotational drive to a pre-stretch assembly, dispensing film at a constant length per revolution.

A variable frequency drive maintains constant torque during packaging material dispensing.

Wheeled bases position the device next to pallets, eliminating the need to transport heavy loads to stationary units.

Bidirectional web elevation secures inboard portions and top layers, preventing material breakage on ragged loads.

Controlled wrap cycle interruptions enable manual operator adjustments to handle specialized load requirements without dedicated machinery.

Segmented wrapping belts with partial segments create localized free spaces that allow reliable adhesive application while maintaining transport stability.

Extracting pre-stretching motors from the rotating ring reduces inertia, enabling higher rotation speeds and precise film tension control.