【SHARE】Requirements for Design and Printing of Corrugated Cartons in Automatic Packing
2025/12/19 Viewers:
The pressing lines must be clear, and the positions of pressing lines and grooves must be precise
Unlike manual boxing, automatic boxing equipment imposes higher requirements on box creasing and slitting. During manual boxing, defects such as shallow creasing or misaligned slitting that affect the natural formation of the box can be manually corrected. In contrast, automatic boxing primarily relies on suction cups, blocking rods, and clamping rods to complete the process, lacking the capability for form correction. Therefore, it is essential to ensure clear creasing when manufacturing the box, making it easy to fold and form without defects like broken lines or fishtail marks. Additionally, the precision of slitting and creasing must be guaranteed, with deviations generally not exceeding 2mm.
To facilitate the upright forming of cartons by automated packaging equipment, some foreign carton machinery manufacturers have recently introduced a process called pre-creasing. This process involves installing a pre-creasing device on the automatic glue box machine, which pre-folds the first and third score lines of the cardboard. This reduces the resistance of the score lines during subsequent folding, making it easier for the automated packaging line to upright the cartons.
The corner void should not be too large
There are typically two methods for automatic sealing: glue sealing and tape sealing. Unlike the manual "I"-shaped sealing method, both glue and tape sealing do not seal the corners of the box. If the corner gaps are too large, they can weaken the box's waterproof and moisture-resistant properties. This is particularly critical for export goods, as the majority are shipped to destinations via containers, where air humidity during ocean transit may reach up to 93%. If the corner gaps are excessively large, the contents are prone to moisture damage. Generally, for automatically sealed cartons, the diameter of corner gaps should not exceed 5mm.
The surface of the carton should be suitable for sealing with transparent tape
For some brands of boxboard, the high surface sizing makes it difficult for transparent tape to adhere effectively. This often results in the tape peeling off during sealing, rendering the box unsealed properly. Typically, for boxboard used as face stock, a tape test should be conducted. The method involves: taking a transparent tape with moderate adhesion, attaching it to the boxboard, and then peeling it off. If the surface layer of the boxboard is also removed during the process, it indicates the boxboard is suitable for tape sealing. Conversely, if the tape can be easily separated without damaging the boxboard surface, the boxboard is deemed unsuitable for tape sealing.
The surface of the tissue paper must have a certain degree of roughness
Some automatic boxing machines also incorporate an automatic stacking system to stack the finished cartons. However, during this process, we found that cartons with highly smooth surface paper and relatively heavy contents could not be lifted by the suction cups. The reason is that cartons with excessively smooth surfaces cannot generate sufficient friction with the suction cups to lift them. Therefore, in such cases, we may consider using surface paper with a rougher texture as a substitute.
There must be excellent flatness
Some beverage packaging, such as that for Pepsi, employs a method of heat-shrink film sealing using paper trays. The paper trays are made from three layers of lightweight B-flute cardboard through die-cutting. During the automatic packaging process, suction nozzles pick up one sheet of cardboard at a time, fold and glue it into a tray, then bottle and seal it with heat-shrink film. If the cardboard has a certain degree of bending, the suction nozzles may experience malfunctions such as picking up multiple sheets at once. Therefore, we must ensure the die-cut cardboard maintains high flatness.
Unlike manual boxing, automatic boxing equipment imposes higher requirements on box creasing and slitting. During manual boxing, defects such as shallow creasing or misaligned slitting that affect the natural formation of the box can be manually corrected. In contrast, automatic boxing primarily relies on suction cups, blocking rods, and clamping rods to complete the process, lacking the capability for form correction. Therefore, it is essential to ensure clear creasing when manufacturing the box, making it easy to fold and form without defects like broken lines or fishtail marks. Additionally, the precision of slitting and creasing must be guaranteed, with deviations generally not exceeding 2mm.
To facilitate the upright forming of cartons by automated packaging equipment, some foreign carton machinery manufacturers have recently introduced a process called pre-creasing. This process involves installing a pre-creasing device on the automatic glue box machine, which pre-folds the first and third score lines of the cardboard. This reduces the resistance of the score lines during subsequent folding, making it easier for the automated packaging line to upright the cartons.
The corner void should not be too large
There are typically two methods for automatic sealing: glue sealing and tape sealing. Unlike the manual "I"-shaped sealing method, both glue and tape sealing do not seal the corners of the box. If the corner gaps are too large, they can weaken the box's waterproof and moisture-resistant properties. This is particularly critical for export goods, as the majority are shipped to destinations via containers, where air humidity during ocean transit may reach up to 93%. If the corner gaps are excessively large, the contents are prone to moisture damage. Generally, for automatically sealed cartons, the diameter of corner gaps should not exceed 5mm.
The surface of the carton should be suitable for sealing with transparent tape
For some brands of boxboard, the high surface sizing makes it difficult for transparent tape to adhere effectively. This often results in the tape peeling off during sealing, rendering the box unsealed properly. Typically, for boxboard used as face stock, a tape test should be conducted. The method involves: taking a transparent tape with moderate adhesion, attaching it to the boxboard, and then peeling it off. If the surface layer of the boxboard is also removed during the process, it indicates the boxboard is suitable for tape sealing. Conversely, if the tape can be easily separated without damaging the boxboard surface, the boxboard is deemed unsuitable for tape sealing.
The surface of the tissue paper must have a certain degree of roughness
Some automatic boxing machines also incorporate an automatic stacking system to stack the finished cartons. However, during this process, we found that cartons with highly smooth surface paper and relatively heavy contents could not be lifted by the suction cups. The reason is that cartons with excessively smooth surfaces cannot generate sufficient friction with the suction cups to lift them. Therefore, in such cases, we may consider using surface paper with a rougher texture as a substitute.
There must be excellent flatness
Some beverage packaging, such as that for Pepsi, employs a method of heat-shrink film sealing using paper trays. The paper trays are made from three layers of lightweight B-flute cardboard through die-cutting. During the automatic packaging process, suction nozzles pick up one sheet of cardboard at a time, fold and glue it into a tray, then bottle and seal it with heat-shrink film. If the cardboard has a certain degree of bending, the suction nozzles may experience malfunctions such as picking up multiple sheets at once. Therefore, we must ensure the die-cut cardboard maintains high flatness.
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