Quick Solution to Die-cutting Problems - Common Faults and Solutions of Die Plate Spring Pads and Indentation Strips

During the die-cutting and creasing production process, various faults often occur between the knife plate spring pad and the creasing strip, such as the aging of the spring pad leading to rough cuts and the dimensional deviation of the creasing strip causing creases and cracks. These faults not only affect product quality but may also lead to the shutdown of the production line, causing losses to the enterprise. Quickly identifying the cause of faults and adopting effective response plans is the key to enhancing production efficiency and ensuring product quality. This article will provide precise solutions for the common faults of the spring pads and indentation strips of the knife plate.

The common faults of the knife plate spring pad mainly include three types: "decreased resilience", "local damage" and "dimensional deformation". The most common malfunction is the decline in resilience, which is manifested as paper adhesion and rough cutting edges after die-cutting. The main reasons are the aging of the spring pad after long-term use or the softening of the spring pad due to excessively high ambient temperature. Solution: If the elastic pad has been in use for a short period of time, it can be placed in a cool and dry place to stand for 24 hours to restore some of its elasticity. If the usage time exceeds the service life, new spring pads should be replaced in time. At the same time, the heat dissipation system of the die-cutting machine should be inspected to avoid excessive temperature accelerating the aging of the spring pads. Local damage is mostly caused by excessive stretching during installation or being squeezed by the blade during die-cutting, manifested as cracks or notches in the spring pad, which can easily lead to deviations in paper cutting. Response plan: If the damaged area is small, special glue can be used to repair the damaged part, and marks should be made at the repair site to strengthen subsequent inspections. If the damaged area is large, a new elastic pad needs to be replaced. When installing, pay attention to controlling the stretching force and avoid excessive force. Dimensional deformation is often caused by improper storage. After the spring pad is squeezed, its thickness becomes uneven, affecting the pressure distribution during die-cutting. Solution: Place the deformed spring pad in a flat plywood, apply uniform pressure and let it stand for 48 hours. If it cannot be restored, it needs to be replaced. When storing, the spring pad should be placed flat to avoid stacking and squeezing.

The common faults of creasing matrix mainly include three types: "blurred creases", "paper cracking" and "installation displacement". The blurring of creases is characterized by unclear lines at the indentation area and easy deviation during folding. The main reasons are insufficient height of the indentation strip, too soft material, or insufficient die-cutting pressure. Solution: First, check whether the height of the creasing strip matches the thickness of the paper. If the height is insufficient, replace it with a creasing strip of a higher specification. If the height is appropriate, a harder creasing strip should be replaced and the pressure of the die-cutting machine should be adjusted appropriately to ensure sufficient creasing force. Paper fracturing is characterized by cracks or breaks at the indentation. The main reasons are that the height of the indentation strip is too high, the width is too narrow, or the paper material is relatively brittle. Solution: Replace the indentation strip with one of a lower height and select one with a slightly wider width to increase the contact area of the indentation. For more brittle paper, the die-cutting pressure can be appropriately reduced, and the paper can be slightly humidified before creasing to enhance its toughness. The installation displacement is manifested as the offset of the indentation position, which does not meet the design requirements. The main reasons are inaccurate positioning of the indentation strip during installation or insufficient adhesion of the adhesive. Solution: Remove the displaced indentation strip, clean the residual glue stains on the surface of the knife plate, reposition precisely according to the marks, and fix it with a special adhesive with stronger adhesion. After installation, let it stand for 10 minutes before starting production to ensure that the indentation strip is firmly fixed.

In addition, it is also very important to establish a fault prevention mechanism. Regularly conduct a comprehensive inspection of the spring pads and indentation strips of the knife plate, record their usage status and replacement time, and predict possible faults in advance. Operators must install and use accessories strictly in accordance with the standard procedures to avoid malfunctions caused by improper operation. Through the closed-loop management of "accurately identifying faults - quickly solving problems - establishing a preventive mechanism", the failure rate of the ejection rubber and the indentation strip can be effectively reduced, ensuring the smooth progress of die-cutting and indentation production.