Relationship between the elastic modulus of polyurethane paper feed roller and paper conveying stability
Publish Time: 2024-11-07
In the paper conveying system, polyurethane paper feed roller plays a key role, and its elastic modulus has a vital influence on the stability of paper conveying.
Basic concept of elastic modulus and its influence on the performance of paper feed roller
Elastic modulus is a measure of the ratio of normal stress to corresponding normal strain in the elastic deformation stage of the material. For polyurethane paper feed roller, the elastic modulus determines its deformation characteristics when subjected to force. Polyurethane paper feed roller with a higher elastic modulus has a relatively small deformation when subjected to paper pressure and friction. This means that the paper feed roller can maintain a relatively stable shape and provide more reliable support for the paper. For example, in a high-speed printing press, the paper passes through the paper feed roller quickly. If the elastic modulus of the paper feed roller is too low, it is easy to deform excessively under the pressure of the paper, which may cause uneven contact between the paper and the paper feed roller, thereby affecting the stability of paper conveying.
Specific correlation between elastic modulus and paper conveying stability
Pressure uniformity
The appropriate elastic modulus ensures that the paper feed roller applies uniform pressure to the paper when it contacts the paper. When the elastic modulus is appropriate, the paper feed roller can be adjusted appropriately according to the actual situation of the paper regardless of whether there is a slight difference in the thickness of the paper. For example, when conveying mixed batches of paper of different gram weights, a Polyurethane Paper Feed Roller with a reasonable elastic modulus can make the paper subject to uniform pressure in the entire width direction, ensuring that the paper is conveyed forward smoothly and avoiding wrinkles or slips of the paper due to excessive or insufficient local pressure.
Friction stability
Friction during paper conveying is crucial to stability. The elastic modulus affects the friction characteristics between the surface of the paper feed roller and the paper. If the elastic modulus is too high, the surface of the paper feed roller is too rigid, which may lead to unstable friction and easy slippage during the start and stop of the paper. On the contrary, if the elastic modulus is too low, although the friction may be large at the beginning, the actual effective friction will change with the excessive deformation of the paper feed roller, which is also not conducive to the stable conveying of the paper. Only when the elastic modulus is in the appropriate range can the friction between the paper feed roller and the paper remain relatively stable, ensuring that the paper passes through the conveying system at a constant speed and state.
How to choose a paper feed roller with a suitable elastic modulus according to the characteristics of the paper
For thin paper, such as rice paper and thin paper, it is necessary to select a Polyurethane Paper Feed Roller with a slightly lower elastic modulus, so that it can gently contact the paper while ensuring sufficient friction to convey the paper and avoid paper damage. For thicker and harder paper, such as cardboard and corrugated paper, a paper feed roller with a higher elastic modulus is required to provide sufficient support and stable friction to ensure that these heavy papers do not shift or jam during the conveying process. In practical applications, factors such as paper conveying speed and the structure of the conveying system need to be considered, and the elastic modulus of the Polyurethane Paper Feed Roller should be comprehensively optimized to maximize the stability of paper conveying and ensure production efficiency and product quality.
