PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS

Introduced: September 1968

Last revised: January 1985

Classification Context

Section:: PERFORMING OPERATIONS; TRANSPORTING
Class:: WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
Subclass:: PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS

Description

B29B encompasses preparation, pretreatment, and conditioning operations on plastic materials prior to shaping or molding processes, including mixing, blending, heating, and drying of virgin or recycled polymers. The class also covers granulation, pelletization, and formation of preforms—intermediate products used in subsequent shaping operations. Additionally, B29B includes recovery and separation technologies for extracting plastics and other valuable constituents from waste streams, such as sorting, cleaning, and processing of post-consumer or post-industrial plastic waste. This classification bridges upstream material processing and downstream shaping technologies covered in other B29 subclasses, excluding the actual shaping/molding operations themselves.

Related Keywords

pretreating PLASTIC in generalpretreating PLASTICS mechanicallymaking POWDER from plastics or substances in a plastic state in generalPULVERISING plastics or substances in a plastic state to be shapedRASPING plastics or substances in a plastic state to be shaped

6 direct subcodes

Child Classifications

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B29B 11/00 Making preforms
B29B 13/00 Conditioning or physical treatment of the material to be shaped
B29B 15/00 Pretreatment of the material to be shaped, not covered by groups
B29B 17/00 Recovery of plastics or other constituents of waste material containing plastics
B29B 7/00 Mixing; Kneading
B29B 9/00 Making granules