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To improve the labeling accuracy of the side and top labeling machine, it is necessary to start from multiple links such as equipment debugging, mechanical structure optimization, material characteristic control, and environmental adaptation, and conduct targeted optimization for the core factors affecting accuracy (such as product positioning deviation, unstable label peeling, labeling timing errors, etc.). The specific methods are as follows: ### 1. Optimize the conveying and positioning system: Ensure stable product posture Product offset or shaking during conveying is the primary factor affecting labeling accuracy. It is necessary to reduce errors by strengthening positioning and conveying stability: - **Stabilize conveying speed and synchronization** Adjust the conveyor belt speed to be strictly synchronized with the labeling head actions (such as label peeling and labeling triggering) (set matching parameters through PLC to ensure that "when the product reaches the labeling position, the label is just peeled to the bonding position"). If the conveying speed is too fast (e.g., > 100 pieces/minute), a servo motor should be installed to drive the conveyor belt to avoid speed fluctuations caused by mechanical transmission (ordinary motors may have speed deviations due to load changes). - **Strengthen product guidance and positioning** Lateral guidance: Install adjustable guide baffles (such as nylon material to avoid scratching products) on both sides of the conveying channel, and reserve a 0.5-1mm gap according to the product width (too large a gap is prone to offset, too small is prone to jamming), to ensure that products are conveyed in a straight line. Longitudinal positioning: Install positioning stoppers or pneumatic pushing devices (such as cylinders driving push plates to align the ends of products) before the labeling station, so that the front/side benchmarks of products are consistent (especially for cuboid and square box products, labeling should be based on fixed edges). Anti-shaking design: For lightweight or tall products (such as slender bottles and high boxes), install top pressure wheels or side pressure wheels (soft rubber material) to avoid tilting due to vibration during conveying. ### 2. Precisely control label peeling and supply: Reduce label self-deviation Unsmooth label peeling, unstable base paper tension, or uneven label viscosity will directly lead to labeling position deviation, which needs to be optimized from the label supply link: - **Optimize the label peeling mechanism** Adjust the peeling plate angle (usually 15°-30°): If the angle is too small, the label is easy to stick to the base paper; if the angle is too large, the label is easy to bounce or wrinkle. Determine the best angle through trial pasting (the label should be peeled flat without curling). Control the base paper tension: Install a tension controller (such as a magnetic powder brake) at the label reel to ensure stable tension during base paper conveying (excessive tension may break the base paper, and too small tension will cause the label peeling position to be erratic). - **Standardize label materials and quality** Choose labels with uniform thickness (error ≤ 0.02mm) and base paper (such as glassine base paper with strong tensile resistance) to avoid peeling position deviation caused by uneven label thickness. Ensure uniform label viscosity (especially the edge part) to avoid slipping during labeling due to insufficient local viscosity. - **Calibrate the label detection sensor** Adjust the detection position of the label electric eye (such as a photoelectric sensor) to accurately identify the label edge or black mark (positioning mark), ensuring that the length of each peeled label is consistent (error ≤ 0.5mm). For transparent labels, special material sensors (such as infrared sensors) should be used to avoid missed detection. ### 3. Finely debug the labeling head and pressing mechanism: Ensure accurate bonding position The angle, height, bonding timing, and pressing force of the labeling head directly determine the relative position accuracy between the label and the product: - **Calibrate the labeling head posture** Side labeling head: Ensure that the labeling head is parallel to the product side (error ≤ 0.5°), and the center of the bonding surface is aligned with the center of the product labeling area (assisted by a laser locator). The height of the labeling head should match the height of the product side (the alignment error between the upper/lower edge of the label and the product edge ≤ 1mm). Top labeling head: Vertically align with the center of the product top, and the descending height of the labeling head should be "the label lightly touches the product surface" (too high may cause the label to sag, too low may squeeze the product). - **Optimize the labeling trigger timing** Detect the moment when the product reaches the labeling position through a photoelectric sensor or vision system (for high-precision scenarios) to trigger the labeling action (delay ≤ 10ms). For high-speed production lines, it is recommended to use "product front edge triggering" instead of "center triggering" to reduce errors caused by product length differences. - **Adjust the pressing force and method** After labeling, it is necessary to re-press through a pressing wheel (rubber or sponge material), and the pressure should be uniform (controlled by a pressure regulating valve to control the cylinder pressure): too small pressure, the label is easy to warp; too large pressure, it may squeeze the product and deform it (especially for flexible packaging). For curved sides (such as round bottles), use a profiling pressing wheel (matching the product curvature); for flat sides (such as square boxes), use a flat pressing wheel to ensure that the label is completely bonded without bubbles. ### 4. Control the consistency of products and labels: Reduce material errors If the size fluctuation of products or labels is too large, even if the equipment accuracy is high, it will lead to labeling deviation, which needs to be controlled from the source: - **Ensure product size consistency** The length, width, and height errors of the products to be labeled should be ≤ 1mm (such as the side length deviation of square boxes and the diameter deviation of bottle bodies), and the surface flatness error should be ≤ 0.5mm (to avoid label bonding deviation caused by depressions/protrusions). For special-shaped products (such as irregular sides), special positioning tools (such as profiling pallets) should be customized to ensure consistent placement posture each time. - **Standardize label size and layout** Reserve a "positioning edge" in label design (such as one edge of the label is parallel to the edge of the base paper) to facilitate equipment to identify the benchmark; the label length and width errors should be ≤ 0.3mm (guaranteed by a high-precision die-cutting machine). ### 5. Upgrade equipment hardware and control systems: Improve automation accuracy For high-precision demand scenarios (such as the pharmaceutical and electronics industries, requiring accuracy ≤ ± 0.5mm), it is necessary to further improve through hardware upgrades and intelligent control: - **Adopt high-precision drive and sensing** The labeling head drive is replaced with a servo motor (instead of an ordinary stepper motor), with a control accuracy of up to 0.01mm/pulse, reducing action delay. Install a visual positioning system (such as a CCD camera) to real-time identify the characteristics of the product labeling area (such as edges, patterns), and dynamically correct the labeling position (can compensate for product offset within ± 1mm). - **Regularly calibrate the mechanical accuracy of the equipment** Check weekly whether the fixing screws of the labeling head, guide mechanism, and conveyor belt are loose (mechanical gaps will accumulate errors), and calibrate the overall level of the equipment with a level (to avoid product offset caused by tilting). Lubricate transmission components (such as gears and belts) monthly to reduce action deviations caused by mechanical wear. ### 6. Adapt to the environment and operating specifications: Reduce external interference - **Control the workshop environment** Maintain stable workshop temperature (15-30℃) and humidity (40%-60%): high temperature and humidity may reduce label viscosity or deform the base paper, and low temperature and dryness may make the label brittle and easy to fold. Avoid strong air flow in the workshop (such as direct blowing of fans) to prevent the label from being blown off after peeling. - **Standardize operation and maintenance** Operators must set parameters (such as labeling speed and delay time) in strict accordance with the SOP (Standard Operating Procedure) to avoid arbitrary adjustments. Regularly clean the residual glue on the label peeling plate and pressing wheel (can be wiped with alcohol) to prevent the label from being offset due to glue adhesion. Round bottle labeling machine, vertical round bottle labeling machine, automatic labeling machine, double-sided labeling machine Foshan Denuo Intelligent Machinery Equipment Co., Ltd. focuses on the R&D, production, and sales of packaging equipment such as filling machines, capping machines, and labeling machines, providing customized packaging production line solutions for the pharmaceutical, food, and other industries, and empowering industrial upgrading with professional strength. Adhering to the concept of innovation, strictly controlling quality, and guided by practicality and economy, we have successfully developed more than 100 types of machines, which have been widely recognized by the market. Continuously increasing R&D investment, we have obtained more than 30 patent authorizations, leading the industry trend with technological innovation. Foshan Denuo Intelligent Machinery Equipment Co., Ltd. has strong strength, creating a national preferential machinery and equipment market, and has won the trust of customers with the characteristics of diversified operations and the principle of small profits but quick turnover.
