How does a stretch film wrapping machine package products

1. Preparation Stage

• Placing Products: Place the products to be packaged (such as cartons, bottles, bulk goods, etc.) neatly on the workbench (or conveyor belt, depending on the type of equipment) to ensure the products are stably positioned and avoid shifting during the packaging process.
• Installing Stretch Film: Mount the stretch film roll on the film frame of the equipment. Adjust the height and angle of the film frame according to the product size to ensure the film can cover all the areas of the product that need packaging.
• Parameter Setting: Set packaging parameters through the equipment's control panel, such as the number of wrapping layers (for the top, bottom, and middle), the stretching ratio of the stretch film (usually 1.5-3 times, adjusted according to the film material and product requirements), and packaging speed.

2. Starting the Packaging Process

• Film Feeding and Positioning: After the equipment is started, the film frame will automatically draw out the stretch film. The film is guided to the product surface through guide rollers. In the initial stage, a small amount of film will fix the bottom or side of the product (some equipment uses a film pressing device for auxiliary positioning).
• Stretching the Stretch Film: While the film is being drawn out, the stretching mechanism (such as stretching rollers, pre-stretching devices) will stretch the film, causing it to undergo elastic deformation. The stretched film has increased tension and can fit more closely to the product.
• Wrapping and Enclosing:
  • For turntable-type equipment: The workbench drives the product to rotate, and the film frame moves up and down around the product (or the product is fixed, and the film frame rotates and lifts), so that the stretch film is wrapped layer by layer on the product surface, forming a uniform wrap from the bottom to the top (or vice versa).
  • For inline-type equipment: Products move continuously through the conveyor belt, and the film frame completes the wrapping on both sides or above the product, which is suitable for assembly line operations.
  • During the wrapping process, the equipment will automatically control the wrapping density according to the set number of layers. Usually, there are more layers at the bottom and top to enhance fixation.

3. Finishing and Cutting

• Ending Wrapping: When the set number of packaging layers or coverage height is reached, the film frame stops moving, and the wrapping action ends.
• Film Cutting and Fixing: The equipment's cutting device (such as a heat-sealing knife, mechanical cutter) cuts the stretch film. At the same time, some equipment will fix the end of the film on the wrapped film layer by heat sealing or pressing to prevent loosening.
• 4. Completing the Packaging

• The packaged product is removed from the workbench (or conveyed to the next link by the conveyor belt). At this time, the stretch film will further tighten and cling to the product surface due to its own elastic shrinkage, forming a firm and sealed packaging effect.

The entire process requires no manual intervention (except for placing products) and has a high degree of automation. It can adapt to products of different shapes and sizes, and is widely used in logistics, food, pharmaceutical and other fields to achieve dustproof, moisture-proof, fixation and cluster packaging of products.