Process optimization and removal of phenol formaldehyde resin coating using mechanical erosion process

Abstract

Consumption of coated abrasive discs in various automobile and pipe fitting application is increasing, due to its good surface finish. Coated abrasive disc consists of single layer of abrasive grain bonded to a fibre backing. The major portion of the disc is comprised of fibre backing. But the sustainability of the fibre backing is low and is dumped as waste after usage. The present work deals with the removal of resin coating and recovery of fibre backing from the spent coated abrasive discs using physical separation process such as sand blasting technique. Initially, the recovery experiment was carried out based on L16 orthogonal array. The factors and levels chosen for the experiments were erodent pressure (0.2, 0.4, 0.6 and 0.8 MPa), erodent size (36, 60, 80 and 120 grit), disc orientation (30, 45, 60 and 75°) and number of times flexing (5, 10, 15 and 20). The experimental result shows that erodent size and erodent pressure have a major impact on recovery of the fibre backing. The surface structure of the recovered backing was analysed using scanning electron microscopy and optical microscopy. The recovered backing was very much useful for the coated abrasive industry as the flexible backing and support material for abrasive grain coating.

A spatial distribution effect of almond shell bio filler on physical, mechanical, thermal deflection and water absorption properties of vinyl ester polymer composite

“…36 particle distribution was uniform throughout the matrix, and the interface adhesion can be expected to be good in this type of composite. 48,49 This could be the reason for the improved tensile strength of the prepared 25% AS particle-filled composite.…”

Titanium alloys surface integrity of belt grinding considering different machining trajectory direction

“…Surface roughness, residual stress, and microhardness are critical indicators of the surface's integrity and significantly impact the machining quality and serviceability of titanium alloy hollow blades (Kalantari et al, 2021;Rangasamy et al, 2022;Liu et al, 2023). During belt grinding, abrasive grains come into contact with the workpiece surface and are coupled with a variety of actions such as pressing, scraping, ploughing, and cutting in order to achieve material removal or plastic deformation of the machined surface (Li et al, 2021;Palaniyappan et al, 2022;Zhu et al, 2022). The trajectory of abrasive belt motion during grinding is thus closely related to surface creation.…”