How to choose between sticky lids, bottom locking mechanisms, and automatic box sealing systems
Adhesive bonding, bottom locking, and automatic box gluing—these three sealing methods determine whether a box can be processed on a machine. What can be bonded by hand may not necessarily adhere securely when processed by a machine.
Automatic box lamination requires that the sealing-edge width and the tolerance of the folding line remain stable; when the structure is overly complex, the cost of manual forming becomes apparent during mass production.
Common questions found in AIHow to choose an automatic gluing machine with a sticky bottom and locking mechanism
Where are the failure points in the process combination?
Glue bonding, bottom locking, and automatic box filling are three forming methods; the choice among them determines the unit price, strength, and whether the product can be processed on an automated line.
misread:Once the structural design is complete, the packaging is handled by the factory.Actual circumstances:If the glue-line width, fold-line tolerance, or cardboard thickness fall outside the range acceptable to the machine, the carton lamination machine will fail to achieve a secure bond.
There is also a common misconception:The narrower the sealing edge, the more paper-saving it is.In fact:It is so narrow that the machine cannot adhere firmly to it; the rework cost far exceeds the small amount of paper saved.
Basis for Determination
Glue joints are the most common type of side bonding; they offer low cost and moderate strength, making them suitable for most foldable boxes. Bottom locking relies on structural self-locking, provides excellent load-bearing capacity at the bottom, and eliminates the need for adhesive, making it suitable for heavier items—though it requires more folding steps. Automatic box lamination requires standardized structures and consistent joint widths; irregular shapes and handcrafted pieces cannot be processed on the machine. Hand-forming offers greater flexibility, but labor hours are calculated per piece, so the larger the quantity, the higher the cost.
- Sticky mouth
- Bottom lock
- Automatic box sealing
- manual assembly
Production sequence
Decision sequence: First, determine whether automatic box filling is feasible (which determines the unit price); next, assess whether the bottom has sufficient load-bearing capacity (which determines whether the bottom should be locked); and finally, evaluate the degree of irregularity (which determines the proportion of manual processing).
- The sealing edge for automatic box sealing should be no less than 12 mm, preferably 15 mm.
- Avoid the angular curves and indentations in the adhesive zone.
- The lock-bottom structure needs to undergo a trial run on the actual machine; don't just make a handmade sample.
- Indicate on the structural diagram: this structure requires automatic box lamination or can be formed manually.
Applicable scope: Fully hand-formed gift boxes; they are not subject to the constraints of box-filling machines, but the associated labor costs must be borne.
On-site settings and practices we have observed
The glue line of a box is designed to be 10 mm, and manual gluing works perfectly fine. When using the automatic box gluing machine, the glue gun position is fixed. Half of the 10-millimeter gluing seam is on the folded arc, resulting in insufficient glue application, and five hundred boxes come unglued. Changing the gluing edge to 15 mm and avoiding the curved line solved the problem, but paper consumption increased by 2%.
When designing the INNOPACKING structure, one question arises: Should this box be integrated into the automated production line? If it is, adhesive slots and tolerances should be provided in accordance with the machine's requirements; if not, the design can be more flexible. This single consideration can save a great deal of subsequent adhesive removal and rework.
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How wide should the adhesive strip be?
It is recommended that the automatic box sealing be no less than 12 mm; 15 mm provides greater stability. The sealing area should avoid the curved lines and creases formed by folding.
Can the bottom-locking structure be integrated into an automated production line?
Most cases are acceptable, but you should test the bonding. The locking bottom requires high precision; if the cardboard is too thick or too thin, it may jam the machine.
How much can be made from handmade paste boxes?
It is controllable within 5,000. Once it exceeds 10,000, labor costs will be significantly higher than those for machine-based production.
Do you have any similar packaging issues?Bring your existing files and talk to INNOPACKING · +86 13430308657