Paper is a major renewable resource. Steps needed to make paper from recycled paper include collecting, sorting, removing contaminants, cleaning, and deinking. Additives are mixed with refined pulp to give paper special properties. Papermaking variations include embedding and embossing. Steps in technological design include identifying needs and opportunities, generating a design, planning and making the product, and testing and evaluating the product.
Technological designs have constraints that can limit design choices.
Constraints can include time and availability of materials. Design requirements specify how a designed object must perform. Product designers continually modify their design specifications in order to improve the products. Skills Learning to perform class paper-property tests. Observing, describing, and recording test results and the structural, optical, and absorptive properties of paper.