The difficulty in controlling the opening of color corrugated boxes is that the properties of the glue before the glue is completely cured are difficult to grasp when the glue box is in operation. It is necessary to stabilize the glue by controlling the parameters of the glue. In addition, several parameters such as viscosity, solid content, pH value, and shelf life should be controlled in the incoming inspection of glue. The glue is easily degraded, and the temperature of the storage environment is generally below 5°C.
It is considered to be the most difficult process investment purchase, but due to the glue box process must use glue boxes and other chemical materials, resulting in an increase of variable factors in the process, the corresponding increase in the risk of quality. Corrugated box opening glue is a common paste box quality problem, and it is also a key control project of the paste box process. For the control of corrugated boxes, the author has some superficial experience and views of printability, and is now shared with colleagues in the printing and packaging industry.
Correct selection of glue glue
To control the corrugated box glue box without opening the glue, it is very important to use the right glue box glue. Once the paste box glue is used wrong, it will cause the whole batch of corrugated box to open. The basic principle of choosing glue glue is: Select different glue according to the different surface treatment methods of corrugated box paper. If the corrugated box's sticky mouth is plain paper and common paper surface, sticky box can use ordinary white latex; if it is paper and film surface (including light film and matte film) bonded label, paste box Need to use paper plastic water, but also with the film surface material selection of different paper plastic water, such as PET or OPP film surface in the paste box should be used when selecting different paper plastic water; if it is paper and UV The surface of the varnish is bonded, and the UV glue is used when gluing; if it is the bond of the paper surface with the polished surface, the polishing glue is needed when the paste box is used. Scanning format. Hand-glued or glued boxes are slow in speed and quality. The glue should be open for a long period of time (from when the glue comes into contact with the adhesive to when the glue can no longer move freely); Short-time glue should be used.
When using glue glue, you must also consider the working environment of the paste box workshop. The glue used in winter and the glue used in summer are different in the ratio, because the same brand, the same batch of glue, digital printing at different ambient temperatures, the viscosity is different, the lower the ambient temperature, The higher the viscosity of the glue. Whether it is winter or summer, the sticking box production process requires the glue to reach the viscosity that is most convenient for the production operation. Due to the low temperature in winter and the higher viscosity of Esko, the adhesive manufacturer of corrugated box manufacturers will have a certain influence if they add thinner to adjust the viscosity of the glue. Therefore, the use of glue at lower ambient temperatures, to maintain the glue adhesive force and the normal reaction mechanism of the glue, it is necessary to make corresponding adjustments to the formulation of the glue Beiren Group, which is also a lot of use in the South is very mature The reason why the glue cannot be used directly in the north is. In addition, we must also consider the use of corrugated boxes, if the corrugated box after the cassette needs to be sent to a high-temperature environment, you need to use a high-temperature paste glue box; if the paste box after the corrugated box needs to be sent to a low temperature environment The use of packaging design, you need to use a low temperature paste glue box. Polishing performance. If the automatic folder-gluer is equipped with a spray gun, you must use the appropriate glue. At the same time, the performance of the gun control system must also be considered. If the gun control system is a hot melt method, hot melt adhesive must be used; if the gun control system is digitally printed in China without heating, a cold spray adhesive must be used.
The above are the precautions that should be taken when using plastic glue to prevent the opening of corrugated boxes. Of course, when using glue, we must also consider whether it is environmentally friendly, whether it is food grade, whether it is anti-mildew and so on. We will not elaborate here.
Sticky box production in the matters needing attention
In order to prevent the corrugated box from being glued during the gluing process, in addition to choosing the right glue for the gluing chamber, offset printing in the gluing box production operation, attention should be paid to the following aspects of control.
In the process planning before the gluing process, the printing ink and the surface treatment layer (varnish, etc.) of the part, which is not capable of being polished or capable of being plasma-processed, shall be considered to be left blank and a die-cutting plate is to be prepared. At the same time, it is necessary to add a die-cutting half-threaded point knife or a flower knife in the corresponding position, which is favorable for the penetration of the glue in the printing equipment, so that the two adhesive surfaces of the corrugated box are firmly bonded and not easy to open. Commercial rotation in China to ensure a stable bonding effect, the best use of automatic folder gluer production. The function of the folder-gluer on the market is more and more comprehensive. By adding some auxiliary devices (such as spray gun device, grinding device, plasma device, CD box device, pre-folding device, anti-hook device, etc.) on the folder-gluer, it can also be The folder-gluer has once completed many paste-box companies of special-shaped corrugated boxes, and it is necessary to make full use of these auxiliary devices to control the opening of glue boxes.
The glue box production operation should fully consider the opening time of the glue, and adjust the speed of the glue box according to the opening time of the glue, and ensure that the two adhesive surfaces of the corrugated box are stably bonded together within the opening time of the glue. If the two adhesive surfaces of the corrugated box are moved beyond the opening time of the glue, the existing adhesive surface detection system and equipment will be damaged, and the re-brushing of the glue will be required, otherwise it will cause the phenomenon of opening or false glue. In addition, according to the glue opening time and curing time to determine the length of the corrugated box after the paste box fixed pressure.
After the gluing box production operation is completed, it is also necessary to determine the storage of the gluing cartridge after the glue is completely cured. Finished corrugated box products are best placed in the color of the gluing workshop before the glue is completely cured. The tampered corrugated box cannot be immediately moved to a location where the outdoor temperature is too high or too low to prevent incomplete curing. The glue melts at high temperatures or freezes at low temperatures, causing the corrugated box to open. When making an imposition, the properties of the glue are difficult to grasp before it is completely cured, and it is necessary to stabilize the glue by controlling the parameters of the glue. In addition, CTP, in the incoming inspection of glue, should control the viscosity, solid content, pH value, shelf life and other parameters. The glue is easily degraded, and the temperature of the storage environment is generally below 5°C.
As long as the paste box process of corrugated box is well controlled, the open glue problem of corrugated box glue box can be solved very well.