No Core Shift, No Wrinkle-Free Waistband: Application Of Three Positioning Technologies in High-Speed ​​Large Waistband Baby Diaper Changing Machine

If the core of the diaper deviates by 2 mm from the center, the entire batch of diapers will be scrapped. Wrinkles in the waistband leave a mark on the baby. High-speed, big-belted baby changing machines can produce 600 or even 800 diapers a minute. At this rate of production, "positioning" is not a matter of precision, but of survival. Three positioning technologies hold the core and belt firmly in position to ensure there is no misalignment.
First Technology: Polymer Positioning Application Technology: Positioning before Core Formation
In a conventional production line, the core is caught in a mechanical clamp and falls under gravity. At high speed, even the slightest wobble can cause the core to shift. Polymer positioning application technology revolutionize this logic. When the core is formed, it uses the bonding properties of the polymer material to "stick" the core precisely to a designated location on the conveyor belt, rather than relying on external forces.
The core advantage of the technology is "contactless positioning." Without mechanical grippers, there is no compression deformation; without gravity drips, there is no risk of displacement. From forming to transferring, the core remains on the same coordinate system and positioning accuracy is controlled to ±1 mm. Combining with 3D core forming technology, the core's thickness, width and absorption zone distribution can be achieved online once without double adjustment.
Jinwei Group's baby pull-up diaper production equipment has reached mass production levels, with a top line speed of 350m / min and zero core positioning drift. This is not a laboratory concept, but a production line currently operating in the Jinjiang workshop in Fujian Province.
The second cutting-edge technique: a perforated core positioning device --sliding plates with springs --"bounce" the core into position.
The more powerful positioning system comes from an invention patent perforated core locator. It works cleverly: the conveyor belt has grooves on both sides, and rectangular sliders slide inside. The top of the sliding plate is above the groove surface and a compression springs is arranged between the side walls and the groove walls. When the core deviates from its designated position on the conveyor belt, positioning blocks on either side, like hands, squeeze the slide toward the center. The compressed spring is then immediately reset, pushing the core back precisely into the center of the conveyor belt.
positioning blocks are also adjustable. The operator turns the handle and the screw drive positioning blocks slips free on the slider. Different core sizes correspond to different positioning distances. After adjustment, the cutter holes in the core at the same time, without stopping the machine for mold changes, one step in place to complete positioning and processing.
The device solves an industry pain point: A production line needs to handle six sizes from NB to XXL. Traditionally, mold changes requires half anhour to shut down, but this device can be done in a matter of minutes. The curve groove of the slider and the curved outer wall of the positioning block cooperate well, ensuring smooth and non-jamming of the slider. Compression springs ensure consistent force for each reset. Even at high speeds, the core is hard to miss.
The third cutting-edge technology: Ultrasonic hot air positioning-the ultimate wrinkle-free belt solution.
Core positioning solves the problem ofwhere to place it, and the waistband positioning solves the problem ofhow to put it. High-speed, large waistline diaper machine adopts ultrasonic and hot-air combined positioning technology to locate in waistline bonding station. Ultrasonic waves weld elastic waistband material to fabric surface, and hot air simultaneously forms the weld area. The belt adheres and sets in 0.8 to 1.2 seconds to prevent shrinkage, wrinkles and displacement.
What's more, the system combines a 360-degree elastic band design to elasticity stretch the belt by up to 40% and rebound rate more than 95%. The ultrasonic welding points are evenly distributed throughout the belt, maintaining free expansion and contraction areas between each fusion point. It extends where it is needed and stays firm when it is needed. The waistband naturally expands and contracts with your breath as you put it on, providing a comfortable, safe, wrinkle-free way to wear it all night.
Different waistband designs, such as foam belt, accordion belt, and stiletto belt, are compatible and switchable on this positioning system. A servo-driven independent drive and tension sensor provide real-time feedback and control belt tightness to ±1 mm, achieving the same accuracy as core positioning.
Three locks, not one less.
The polymer positioning system secures the core to the molding position, a perforated device secures the core to the delivery position, and ultrasonic hot air welds the belt to the joint position. The three positioning systems were ring-fenced, and if any of them failed, all the work that followed would be for naught. That's the confidence of the high-speed, large-waisted baby diaper machine's ability to reach the speed of 800 diapers a minute-not just speed, but the accuracy of each one. The fetal heart remained in place, the waistband was unwrinkled, and every diaper the baby wears is made with engineered precision.