2results about How to "High shear modulus" patented technology

This invention relates to the field of badminton racket technology, and in particular to an anti-torsion racket frame, comprising a head frame and a shaft. The head frame is formed by curing a composite prepreg and has a hollow cavity inside. A reinforcing core is partially or completely disposed within the hollow cavity. The head frame and shaft are fixedly connected. Carbon fiber composite prepreg is preferred as the composite prepreg. This invention also discloses a method for preparing the anti-torsion racket frame. The anti-torsion racket frame and its preparation method obtained by this invention embed a honeycomb-structured reinforcing core at the lower end of the head frame and fill it with foam material. Utilizing the high shear modulus of the honeycomb reinforcing core and the expansion and filling characteristics of the foam material, the torsional stiffness and overall strength of the corresponding area are enhanced without significantly increasing the weight of the head frame.

This invention provides a method for preparing oblique fiber honeycomb core material, comprising the following steps: A) designing a coating roller, wherein the adhesive lines of the coating roller form an acute angle with the axis of the coating roller; B) using the coating roller in step A) to transfer the adhesive to the surface of the woven fabric, obtaining a woven fabric coated with adhesive lines; C) cutting the woven fabric obtained in step B) to obtain several woven fabric strips; D) stacking the woven fabric strips sequentially to obtain multiple layers of woven fabric strips; E) curing the multiple layers of woven fabric strips with adhesive, and then stretching them to obtain oblique fiber honeycomb core material. This application also provides a method for preparing oblique fiber honeycomb core material with a different cutting direction for the woven fabric, but which can still achieve the same result. The method for preparing oblique fiber honeycomb core material provided by this application is simple to operate, can directly use traditional honeycomb core material production equipment, has high production efficiency, and the oblique fiber honeycomb core material prepared by this application can significantly improve the shear modulus of the honeycomb core material.