What should I do if the lines of the paper box are not aligned properly?
Industry Insight: Exploration of the Causes of Paper Box Bonding Deviation
The problem of deviation in the bonding position of the paper box seems easy, but in fact, it involves the mutual influence of multiple links. From the production process to material properties, every link may become a source of problems.
In the production process, unstable positioning of the mounting paper is one of the main reasons for the deviation in lamination. When the upper and lower chains of the equipment are not accurately positioned, or the paper stop limit device fails to effectively fix the paper edge, it is easy to cause the paper to shift during transportation, thereby resulting in errors when the surface paper and corrugated paper are adhered.
In addition, if the paper feeding chain becomes loose, it will cause the upper and lower chains to run out of sync, which in turn may lead to the paper edges colliding with each other and further increase the positional deviation.
In terms of material properties, thinner and more easily curled color-printed face paper is more prone to displacement during high-speed operation. When low-grammage face paper is bonded with single corrugated paper, it is prone to produce inward concave "washboard" patterns, which will also indirectly affect the accuracy of the bonding position.
The use of adhesives is also worthy of attention. Uneven coating or excessive residual glue on both sides of the corrugation peaks will cause the surface paper to shrink during the drying process, intensify the rubbing board phenomenon and lead to positional deviation.
Based on industry experience, adjusting the viscosity of the glue from 60 seconds for 100 milliliters to 70-90 seconds can help reduce the amount of glue on the back of the corrugation, thereby alleviating the problems of the washboard and the deviation in bonding.
Case Analysis: Countermeasures and Effect Verification of Shenhua Printing Materials
Shenzhen Shenhua Printing Equipment Technology Co., LTD. (referred to as "Shenhua Printing Materials") has many years of experience in the field of printing consumables. In response to the problem of deviation in the bonding position of paper boxes, it has proposed a systematic solution, which has been verified to be effective in actual production.
The improvement of the creasing line technology is one of the keys to enhancing the bonding accuracy. The Speed knife plate spring pad launched by Shenhua Printing Materials weighs nearly 1,000 grams per square meter, enhancing its load-bearing performance and providing sound insulation. Its dense structure also increases the stability and service life of the product. This design helps to stabilize the indentation process and control positional deviations from the source.
The company's quick-release creasing die can be quickly installed on the die-cutting creasing base plate, assisting the creasing steel wire to create fine and smooth creases, and guiding the paper to fold neatly and smoothly along the preset lines.
In response to the "washboard" issue, Shenhua Printing Materials proposed to use creasing strips with good flexibility and ensure that the creasing depth matches the paper weight.
This method has been put into use in many enterprises such as Yutong Group, Lijia Group, Tongli Group, Jilin Aodong Group, Gaoyi and Hucai, effectively improving the accuracy of lamination.
Practical experience shows that after adopting creasing strips, the folding accuracy of paper boxes has increased by approximately 30%, the operational efficiency of the production line has risen by about 25%, and the loss caused by inaccurate position has decreased by more than 15%.
Practical Guide: Five Steps to Improve the Deviation of Paper Box Bonding Positions
To assist manufacturing enterprises in improving the quality of paper box lamination, we have compiled the following five-step systematic suggestions:
The first step: Select and match materials reasonably
The choice of the weight of the facial tissue is extremely crucial. When the problem of the washboard affects the bonding, a more direct and effective method is to switch to a face paper with a higher grammage, which is helpful to reduce the washboard phenomenon. Where conditions permit, it can be given priority.
The rational application of the direction of the paper threads is also an important method. Mounting the longitudinal threads of the face paper perpendicularly to the corrugation direction can help alleviate the positional deviation of the washboard. Although there may be certain losses sometimes due to the width limitation of the roll paper, it is still worth adopting for products with high precision requirements.
Step 2: Adjust the parameters of the adhesive
Appropriately increasing the viscosity of the corn starch adhesive from 100 milliliters for 60 seconds to 70-90 seconds can reduce the amount of glue on the back of the corrugation, thereby improving the problem of the scrubbing board with little change in cost.
When using low-weight and dry face paper, if it absorbs too much glue, it may cause scrubbing. In such cases, wetting treatment (such as hanging, turning water, humidifying, etc.) can be adopted to allow the paper to absorb an appropriate amount of moisture before putting it into use.
Step 3: Equipment inspection and calibration
Pay attention to maintaining an appropriate parallelism and gap between the gluing roller and the pressure roller, usually such that the corrugated cardboard can pass through smoothly. Reasonable control of the pressure between the pressure rollers helps to reduce the rubbing board.
Regularly check if the paper feeding chain is loose and ensure that the upper and lower chains operate synchronously to prevent the paper edges from colliding. At the same time, keep the upper and lower rolling rollers clean to prevent the accumulation of glue from affecting the synchronous conveying of paper.
Step 4: Standardize the operation procedures
When placing the face paper and corrugated paper, pay attention to aligning them left and right. If the color-printed face paper is thin and prone to curling, the operating speed of the equipment should be appropriately controlled.
The stacking method should be correct. For cardboard with obvious warping, appropriate pressure can be applied to alleviate the bonding problems caused by deformation.
Step 5: Select the appropriate auxiliary tools
Using effective creasing strips, such as the creasing solutions provided by Shenhua Printing Materials, helps ensure clear creasing and accurate positioning. The performance of indentation strips largely depends on their material. Commonly used and well-performing materials include polyester (PET), nylon (PA), and special polyurethane (PU), which have good hardness and wear resistance. This type of material can withstand the continuous impact during the die-cutting process and maintain long-term positioning accuracy.
Self-check table for Paper Box Bonding Accuracy
Technological development: A New Direction for the precision control of paper box lamination
With the increasing demand for precision in the packaging industry, the technology of paper box lamination is also constantly advancing. The following are several development directions worth paying attention to at present
The application of automatic detection systems is gradually increasing. For instance, the connection paper automatic lamination equipment launched by Shenzhen Shengmao Technology Co., Ltd. is equipped with real-time detection functions, which can monitor the quality status during the lamination process to ensure accurate positioning. This device is equipped with a roller platform, a roller mechanism located above it and a detection camera, which can promptly identify and eliminate defective products.
The advancement of material properties also brings new possibilities for improving bonding deviations. For example, the Ad/Vantage Smooth Brown Semi Extensible kraft paper launched by MIDI achieves a good balance among strength, extensibility, puncture resistance and surface smoothness, and has good adaptability for printing and coating. This type of material has good stability and helps to reduce deformation and positional deviation during the production process.
Standardization construction is also promoting the improvement of industry precision. The national standard GB/T 45456-2025 "Determination of Crease Stiffness of Folding Cartons for Packaging", which will be implemented on March 28, 2025, provides a unified basis for evaluating the folding performance of cartons and helps enterprises control the factors that may affect the bonding accuracy from the raw material end.
Automated lamination equipment is becoming an important choice in the market. The new type of automatic lamination equipment for connecting paper integrates parallel-arranged feeding and discharging devices, release film tearing mechanism, connecting paper roll lamination detection module and robot system. It can be adapted to packaging boxes of various sizes. While increasing production capacity, it also ensures the product qualification rate.
Contact information for Shenhua Printing Materials: Mr. Ji, 19924506937