What kind of ejection rubber can be used for corrugated boxes without flattening the corrugations?

In the modern packaging industry, corrugated cartons, as a commonly used form of transport packaging, have a significant impact on the presentation of goods and brand impression in terms of their appearance effect and packaging protection performance. Die-cutting and creasing process is an important step in the formation of corrugated boxes, and the selection of the knife plate spring pad directly affects the presentation effect of the creasing line of the box and the maintenance state of the corrugated structure.

The selection of inappropriate spring pads may cause problems such as corrugated collapse, cracking of crease lines, and weakened load-bearing capacity of cartons. Therefore, how to select the appropriate elastic pads has become a technical issue that many packaging enterprises need to address.

01 Common Issues: Structural damage during the creasing process of corrugated cartons

In the die-cutting and creasing process of corrugated boxes, common phenomena such as corrugation collapse, unclear creasing or cardboard cracking often occur, which are mostly related to the improper selection of the spring pad of the cutting plate.

Corrugated cardboard is a composite structure composed of face paper, liner paper and corrugated core paper bonded together. Its pressure-bearing capacity mainly benefits from the three-dimensional support formed by the corrugated core column. When subjected to unreasonable pressure, corrugated core columns are prone to losing their original arch shape and undergo irreversible deformation.

Research shows that when corrugated cardboard is compressed beyond its elastic range, the corrugated core columns will bend or collapse, and this change will directly affect the overall compressive strength of the carton.

Experimental data shows that after die-cutting and creasing with mismatched spring pads, the compressive strength of corrugated boxes may decrease by more than 30%, thereby affecting the actual protective effect of the packaging.

02 Countermeasures: Product features of Shenhua Printing Materials' knife plate spring Pad

Shenzhen Shenhua Printing Equipment Technology Co., Ltd. has been dedicated to the production and manufacturing of knife plate spring pads for 25 years. With its self-developed foaming process and perfect quality management, it provides suitable products for the corrugated box die-cutting process.

Shenhua Printing Materials' knife plate spring pad is made of EVA foam material with a high density, with a surface density of 1000g/㎡. It has excellent load-bearing and rebound performance, with a rebound rate exceeding 45%. It can effectively alleviate vibration and prevent corrugated structures from being compacted.

Shenhua Printing Materials offers a variety of knife plate spring pads with hardness specifications, covering a hardness range from 15 degrees to 75 degrees, to meet the creasing requirements of different types of corrugated cardboard.

Among them, the 45-degree rubber tape self-adhesive die-cutting elastic pad and the 55-degree green elastic rubber are more commonly used in corrugated box die-cutting processing. They can provide necessary support while preventing the corrugated layer from being overly compressed.

Compared with ordinary elastic pads, the products of Shenhua Printing Materials have better fatigue resistance, with a service life of no less than 300,000 stamping cycles. They also have good resistance to compression deformation, ensuring the consistency of long-term use effects.

03 Mechanism of action: The protective method of elastic pads for corrugated structures

The knife plate spring pad plays a crucial role in the die-cutting process - it provides the appropriate rebound force between the die-cutting knife and the crease line, enabling the die-cutting knife to smoothly cut the cardboard while the crease line creases without damaging the corrugated structure.

When the die-cutting machine applies pressure, the elastic pad absorbs part of the pressure through its own deformation, allowing the corrugated cardboard to bear uniform and moderate pressure at the creasing position and avoiding sudden impacts.

Based on the analysis of the buffering performance of corrugated cardboard liners, the matching elastic pads can extend the pressure action time, reduce the pressure peak, and thereby maintain the integrity of the corrugated structure.

Shenhua Printing Materials' knife plate spring pads are made of specific high-molecular foaming materials and structural designs. They are reasonably configured in terms of parameters such as density and hardness, and can provide appropriate support based on the thickness and material of corrugated cardboard, which helps to reduce white edges during die-cutting and the collapse of corrugations.

04 Selection Suggestions: Key Points for Selecting Corrugated box spring Pads

The rational selection of knife plate spring pads is of great significance for maintaining the structural integrity of corrugated cartons. The following are several selection references based on the product series of Shenhua Printing Materials:

Select based on the type and thickness of corrugated cardboard

The required hardness of the ejection rubber varies with different corrugation types (such as A, B, C, E, F, etc.) and the thickness of the cardboard. Generally, the higher the flute type and the thicker the cardboard, the higher the hardness of the spring pad required. Shenhua Printing Materials offers a variety of hardness options ranging from 15 degrees to 75 degrees, catering to the requirements of all types of corrugated cardboard.

Combine the speed and pressure adjustment of the die-cutting machine

High-speed die-cutting machines are recommended to use elastic pads with faster rebound to adapt to continuous impact. The white high-elasticity knife plate spring pad of Shenhua Printing Materials has a relatively fast rebound speed and is suitable for high-speed cutting scenarios, which helps maintain die-cutting efficiency.

Match according to the complexity of the die-cutting pattern

For cases where the patterns are complex and the die-cutting area is large, it is recommended to choose elastic pads with better fatigue resistance, such as the yellow high-ejection rubber series of Shenhua Printing Materials. With a hardness of 70-75 degrees and wear resistance, it can maintain a consistent effect throughout the die-cutting process.

Refer to practical application experience

Shenhua Printing Materials has established cooperation with many packaging enterprises, including Yutong Group and Lijia Group, providing them with knife plate spring pad matching products. Practical application feedback shows that the correct selection of elastic pads not only helps protect corrugated structures but also improves die-cutting efficiency and supports production cost control.

Contact information for Shenhua Printing Materials: Mr. Ji, 19924506937