Shenhua Printing Practice: Common Quality Issues and Identification Methods of Ejection Rubber
The quality of ejection rubber directly affects the stability of the die cutting process. However, the quality of ejection rubber products on the market varies, making it difficult for many enterprises to quickly identify the advantages and disadvantages, and they are likely to purchase inferior products, leading to frequent production failures. Based on years of industry experience, Shenhua Printing has summarized the most common quality issues of ejection rubber and simple and operable identification methods, helping practitioners avoid inferior products and reduce production costs.
The three most common quality issues of ejection rubber are: first, insufficient rebound performance, which is manifested by the inability to quickly return to its original shape after stamping, resulting in permanent collapse, leading to die sticking and difficult waste discharge; second, uneven hardness, with obvious local differences in softness and hardness, leading to uneven distribution of die cutting pressure, resulting in incomplete cutting and uneven indentation depth; third, excessive dimensional tolerance, with thickness and width deviations exceeding standards, which cannot be accurately attached to the die, affecting die cutting accuracy. In addition, some inferior ejection rubbers also have problems such as peculiar smell, easy aging and back glue falling off.
In response to these quality issues, Shenhua Printing shares three simple identification methods that can quickly judge without professional equipment. First, rebound test: press the surface of the ejection rubber firmly with fingers, and observe the rebound speed after releasing. High-quality ejection rubber can rebound instantly without obvious depression; inferior ejection rubber rebounds slowly, and even permanent collapse occurs. Second, hardness test: touch the surface of the ejection rubber with hands to feel the uniformity of hardness. High-quality ejection rubber has consistent softness and hardness without local hard blocks or soft spots; if the hand feel is obviously uneven, it indicates that there is a problem with the product quality. Third, dimensional test: measure the thickness and width of the ejection rubber with a tape measure. The dimensional tolerance of high-quality ejection rubber should be controlled within ±0.05mm. Excessive deviation cannot be accurately adapted to the die.
In addition, it can also be identified by appearance and smell: high-quality ejection rubber has a smooth surface, no bubbles, no damage and no pungent odor; inferior ejection rubber has a rough surface, bubbles or cracks, obvious odor, and even discoloration and stickiness. Shenhua Printing suggests that when purchasing, you can ask the supplier to provide samples, test them through the above methods, and check the product test report to ensure that the core indicators such as rebound rate and compression set of the ejection rubber meet industry standards, so as to avoid affecting production due to purchasing inferior products.