600A Center-seal, four-side-seal bag making machine

How to solve the impact of temperature difference on sealing quality during the center sealing and four-side sealing process?

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The impact of temperature difference on sealing quality presents complex multi-dimensional characteristics. From a microscopic perspective, uneven temperature will lead to a gradient change in the melting degree of polymer materials at the sealing point: the film in the high-temperature area will break due to excessive melting, forming visible wrinkles, bubbles or perforations; while the low-temperature area will not be fully melted due to insufficient interface bonding strength, resulting in hidden dangers such as false sealing and delamination. Taking dairy packaging as an example, if there is a temperature difference at the sealing point, under the pressure fluctuation of cold chain transportation, the weak area is very likely to leak, which directly threatens food safety. From a mesoscopic perspective, the natural contradiction between the center sealing and four-side sealing processes has aggravated the difficulty of temperature control - the center sealing process requires the heating device to continuously heat melt the center line of the film at a constant temperature to pursue the flatness and firmness of the edge sealing; while the four-side sealing requires local rapid heating and cooling at the corners to ensure a clear sealing contour without damaging the main body of the film. The two processes have very different requirements for temperature curves, making it difficult for traditional bag making machines to balance efficiency and quality. From a macro production perspective, the heat accumulation effect of equipment under continuous operation, fluctuations in workshop environment temperature and humidity, and even subtle changes in grid voltage will interfere with the stability of the temperature control system. In a high temperature environment, the actual temperature of the heating plate of an ordinary bag making machine deviates significantly from the set value, resulting in a significant decrease in sealing strength. ​
In order to break this industry technical barrier, Huitong Packaging Machinery, relying on the deep accumulation of more than 400 patented technologies, aims at extreme precision and rapid response, and has created an internationally leading temperature control system for the 600A Center-seal, four-side-seal bag making machine. In terms of hardware innovation, the core heating component of the equipment adopts a honeycomb heating plate formed in one piece by German laser cutting technology. Through the precise microchannel design, the temperature uniformity of the plate surface far exceeds the industry average standard. The surface of the heating plate is also treated with a special coating, which not only enhances the corrosion resistance, but also effectively reduces the friction coefficient between the film and the plate surface, avoiding uneven temperature caused by dragging. The intelligent temperature control sensor produced by the Japanese horizontal machining center and the Taiwan high-precision machining center innovatively adopts advanced temperature measurement technology. It can not only monitor the surface temperature of the film in real time, but also obtain the internal hot melting state, and realize the dynamic capture of the temperature field of the edge sealing area in an all-round way. These sensors transmit data to the central control system at an ultra-high sampling frequency to ensure that any slight temperature fluctuation can be responded to in time. ​
In terms of software algorithms, the intelligent temperature control system equipped with the 600A bag making machine is a benchmark in the industry. The system's built-in deep learning model can automatically generate the optimal temperature control strategy when new materials are imported through continuous training of the global massive film material heat sealing data. In the face of the composite packaging needs of biodegradable materials and traditional films, the system can accurately match the melting point differences of different materials and adopt innovative composite processes to ensure that the environmental protection characteristics are not damaged and achieve high-strength bonding. In response to the differentiated needs of center sealing and four-side sealing, the system innovatively introduces advanced control algorithms to divide the edge sealing area into many micro-control units, each of which can independently adjust the temperature, pressure and time parameters. When producing four-side sealed special-shaped bags, the system can automatically adjust the heating power of the corner area according to the bag contour, improving the sealing strength while reducing energy consumption. In addition, the system also has an intelligent self-learning function. It can predict the impact of factors such as equipment aging and environmental changes on temperature control by analyzing historical production data, and make parameter compensation in advance to ensure long-term production stability. ​
In terms of equipment structure design, Huitong Packaging Machinery minimizes the impact of temperature differences through the innovative concept of modularization + adaptiveness. The heating unit of the 600A bag making machine adopts a quick-detachable modular design. Each module is equipped with an independent heat dissipation circulation system. Users can quickly switch heating components of different specifications according to production needs. During use, a multinational daily chemical company successfully realized the production switch from conventional three-side sealed to eight-side sealed packaging bags by replacing customized heating modules, greatly improving efficiency. The three-dimensional air duct heat dissipation system inside the equipment, combined with the standardized heat dissipation components guaranteed by a large three-dimensional warehouse, can control the temperature of key components within a safe range when the equipment is running at full load, ensuring the long-term stable operation of the temperature control system. The equipment also integrates an environmental parameter adaptive module. When changes in workshop temperature and humidity are detected, it will automatically adjust parameters such as the preheating time of the heating plate and the fan speed to achieve a dynamic balance between the production environment and equipment performance. ​
In the field of pet food packaging, the aluminum foil composite packaging bags produced by Huitong 600A bag making machine have greatly reduced the gas permeability of the packaging through precise temperature control, effectively extending the shelf life of pet dry food. The transparent PE packaging bags produced by this equipment in the clothing industry are still intact at the seal after rigorous low-temperature transportation tests, and the breakage rate is significantly lower than that of traditional equipment. With these excellent performances, Huitong 600A bag making machine has not only been at the forefront of domestic market share for a long time, but has also been exported to dozens of countries around the world, with exports accounting for a high proportion of total production, becoming a "Made in China" solution trusted by global flexible packaging companies.