Purging agent and process for purging a resin molding machine with the same

摘要

The present invention has an object to provide a cleaning agent that has excellent cleaning properties and replacement properties and can further improve the workability during the cleaning of a resin-molding machine, a process for cleaning a resin-molding machine using the same, and the like. A cleaning agent comprising a pellet containing a thermoplastic resin, and 5 to 50 parts by weight of a substance that is liquid at use temperature, based on 100 parts by weight of the thermoplastic resin is used. Such a cleaning agent is introduced into the cylinder of a resin-molding machine, heat is applied to the cleaning agent to hold it in a plasticized state, and the cleaning agent held in a plasticized state is discharged from the cylinder of the resin-molding machine.