Types and causes of defective products in Zhoushan small can sealing machine

In the small can sealing machine equipment, the sealing roller, the upper pressure head and the can tray are usually called the three elements of sealing. The correct groove shape of the roller, the reasonable position of the pressure head and the proper driving force of the can tray are the necessary conditions to ensure normal and rolling sealing. As the basic component of the sealing equipment, the sealer element is also the basic factor that affects the double curling. If the coordination between various factors is not good, defective products will appear. Common types of defective products in double curling are:

Fake rolls-the crimping body hook and the lid hook do not bite, the reason is that the flanging damage caused during the transportation and conveying of the can body, the unqualified shape of the can body flanging, the round edge defect or damage of the can lid, when sealing, The can lid is not aligned with the can body, etc.

Large collapsed edge-due to the serious collapse of the can body or the edge of the can lid when the can is sealed, the can body and the can lid are not hooked with each other, and there are obvious can body cuffs exposed under the curling, the reason is that the can body is transported Flanging damage caused during transportation, unqualified can body flanging shape, damage to the round edge of the can lid or too large round edge, and the can lid is not aligned with the can body of a small can seamer when sealing.

Jump sealing——Due to the thick curling at the welding seam, the sealing roller skips when passing through the can body welding seam and fails to compress the curling. The reason is that the sealing machine runs too fast and the 121-wheel buffer spring for the second seal is too fast. Soft, too thick seams on the can body, etc.

Incomplete crimping——The partial crimping is not completely compressed due to the slippage of the can lid on the indenter or the poor rotation of the sealing roller. It is characterized by that part of the crimping has a normal thickness and part of the crimp is too thick. The tray pressure is too small, the size or taper of the can lid and the pressure head is not appropriate, the pressure head is worn, the height of the pressure head shaft is adjusted improperly, the distance between the pressure head and the tray is too large, the tray spring fails, the pressure head or the tray has oil, pressure The head axis moves, and the positioning is not accurate.

Crimping "The tooth'l cover hook and body hook are not overlapped, and the v-shaped protruding formed on the lower edge of the crimping. The reason is that the sealing curve of the sealing wheel is not ideal, the sealing roller is adjusted too loosely, and the sealing wheel is worn , Too tight adjustment of the second sealing wheel will aggravate tooth defects, the design of the can lid is not ideal, the can lid has wrinkles on the plastic bearing surface, debris is trapped in the curling or too much sealant in the can lid, and the tray pressure is too high. Large, too many solid cans, and inflexible operation of the sealing wheel bearings.

Cracking of crimping——The outer iron sheet of the crimping at the seam of the can body of the small can seaming machine is broken. The reason is that the two sealing wheels are adjusted too tightly, the lid material is defective, the sealant in the lid is too much, and the crimping is clamped Into the sundries, or because the head sealing wheel is adjusted too tightly, causing the can lid to be folded too long, etc.;

The tightness does not meet the requirements-the reason is that the curve of the sealing wheel is unreasonable, the adjustment of the sealing wheel is inappropriate, the curve of the sealing wheel is severely worn, the shape of the plastic bearing surface of the can lid is unreasonable or the plastic bearing surface of the can lid is wrinkled, the sealing wheel Inflexible bearing operation, etc.

Hemming damage-the appearance of the hemming part is damaged, not smooth, or the coating falls off, because the curve of the sealing wheel is unreasonable, the surface finish of the or second sealing wheel is low, or the wheel adjustment is tight, etc. .

In short, through the analysis of the above aspects, we have a preliminary understanding of the quality and comprehensive control of the sealing process. Only when there are different crimping quality defects, we can make timely and accurate analysis and judgments.