GB/T 27934.4-2011 "Control and Testing Methods for Lamination of Paper-based Printed Products - Part 4: Reaction-type Polyurethane (PUR) Hot Melt Adhesive Instant Lamination" applies to the process control of the lamination of paper-based printed products using PUR hot melt adhesive instant coating. It specifies technical requirements for the entire process, including control standards for raw materials (PUR hot melt adhesive, films, etc.), process parameters (adhesive application amount, temperature, pressure), equipment, and environmental conditions. It details quality requirements and testing methods for finished products, such as adhesion, resistance to heat and humidity, and aging resistance, and includes specifications for storage and transportation to ensure the stability of the production process and the reliability of the finished products for paper-based printed products with instant lamination.