What Causes Cardboard Boxes Produced By A Cardboard Box Press To Be Uneven?

The crease line is the core factor that determines the flatness of a carton's hinge:
Uneven crease depth: Wire Uneven wear, leading to deep wrinkles in some places and shallow wrinkles in others, leading to uneven wrinkles.
Deformed or bulging crease line: over time, the steel wire loses elasticity, resulting in localized bulging and incomplete crease placement, resulting in inconsistent rebound when the cardboard foldings.
Creasing line misalignment: the steel wire is not in the right position on the bottom die, resulting in the wrong position creases and uneven shape of the non-square box.
Creasing gap too large or too small: up and down the steel wires spacing is not correct, too large gaps can hinder infiltration, too small gaps can damage the cardboard surface, both of which can lead to uneven creases.

Improper installation of die cutting die: die cutting die and base plate installation is not fully matched or fixed firmly, in the stamping process produced a slight displacement, resulting in uneven corners.
Uneven base plate: if the base plate itself is deformed, worn or partially dented, the mold will not be on the flat surface, resulting in uneven pressure on the carton.
Unsuitable pads (spring cushions): uneven thickness or aging and loss of spring cushions elasticity results in inconsistent pressure and variation in indentation depth.
Die sharpness is uneven: some parts of the die are sharp, others dull. In the cutting process, some areas will be cut, some parts will not be cut, leading to uneven wrinkles.

Non-parallel pressure plates: If the upper pressure plate is not parallel to the lower workbench, one side is pressed too tightly and the other side is too loose, causing the carton to bend.
The gap between the slider and guide rail increases with the passage of time, causing oscillation or tilt in the stamping process, resulting in uneven pressure distribution.
Uneven pressure of four columns: In a four-column press, uneven pressure across four columns can cause the pressure plate to tilt, resulting in uneven pressure on the carton.
Guide rail wear: the surface of the guide rail surface scratches or wear caused uneven movement, leading to pulling or dislocation, affecting compression accuracy.
Unstable hydraulic system pressure: the fluctuation of oil pressure can cause inconsistent pressure, sometimes deep and sometimes shallow, resulting in uneven height of the box.

In many cases, the problem is not the machine, but the cardboard itself:
Uneven moisture content: Some parts of the cardboard are dry and some are wet; dry areas are hard and wet areas are soft. Inconsistent crease bounce off the back of an uneven box according to the results.
Inconsistent cardboard thickness: different parts of the same piece of cardboard are thicker than other parts, naturally producing different crease depths.
Cardboard warping: If the material is curved or wavy, no amount of adjustment will create a flat box.
Poor adhesion between the lining and core paper: Layered or weak adhesion can cause the the linerboard to fold and layer at the crease, resulting in an uneven surface after folding.
Incorrect Cardboard Fiber Orientation: The angle between the corrugated direction and the crease line is not correct, it is easy to lead to the process of folding tilt or uneven.

Improper Pressure Adjustment: excessive pressure will lead to cardboard tearing, insufficient pressure will lead to the cardboard not completely crumpled, both will lead to uneven cardboard. Tweaks based on cardboard are necessary.
Inaccurate Paper Feed Positioning: Pressing on incorrectly positioned cardboard can cause the cardboard box to bend.
3. Too much pressure: Too fast can have too much impact, so that the pressure is not evenly distributed, leading to incomplete or excessive pressure in some places.
Multiple Pressing Overlaps and Misalignment: For products that require multi-pressure, each dislocation accumulates into a noticeable unevenness.

 
Temperature Influence: workshop temperatures is too high or too low will affect the moisture content and elasticity of cardboard, indirectly cause the squeezing effect instability.
Humidity Influence: In a humid environment, cardboard absorbs moisture and softens, causing deep creases and poor bounce. Excessive dryness can make cardboard brittle, causing creases to crack.
In summary, in the daily operation, should pay attention to the above points, to avoid carton press production of uneven carton.