White Laminated Polyester Film Coating for UV Ink and Wet Blocking
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Solution Overview
Problem
Conventional polyester films face issues with blocking when dew condensation occurs, leading to adhesion of film surfaces and coating layers, and struggle to achieve both adhesion to UV ink and blocking resistance, with seasoning processes causing productivity delays.
Innovation Solution
A white laminated polyester film with a coating layer formed by curing a composition containing a urethane resin with a polycarbonate structure and branched structure, a crosslinking agent, and a polyester resin, which improves adhesion to UV ink and resistance to blocking when water adheres.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a coating layer is formed on polyester film to improve adhesion to ink, then adhesion to UV ink is improved, but blocking occurs when dew condensation water adheres to the film surface
Solution Approach 1:
The invention changes the chemical composition parameters of the coating layer by incorporating a specific crosslinking agent (melamine resin or isocyanate) in controlled amounts (0.1-10 wt% and 1-50 wt% respectively) within the polyester resin coating. This parameter adjustment creates a coating with optimized molecular structure that maintains adhesion while reducing water-induced blocking
Solution Approach 2:
The invention creates a composite coating material combining polyester resin with crosslinking agents (melamine resin or isocyanate) to form a multi-component system. This composite structure provides both adhesion to UV ink and resistance to blocking under dew condensation conditions, resolving the contradiction between these two properties
2Object-affected harmful factors
If seasoning process is applied to avoid blocking problems, then blocking resistance is improved, but processing time is delayed and productivity deteriorates
Solution Approach 1:
The invention applies preliminary action by incorporating the crosslinking agent into the coating layer formulation before film production. This pre-built protective structure provides inherent blocking resistance from the start, eliminating the need for subsequent seasoning processes and maintaining high productivity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The film exhibits excellent adhesion to UV ink and resistance to blocking even under dew condensation conditions, enhancing processing efficiency and productivity.
Implementation Method 1
the coating layer being formed by curing a composition containing a urethane resin with a polycarbonate structure and a branched structure, a crosslinking agent, and a polyester resin
Data Source
AI summary
Provided is a white laminated polyester film that has blocking resistance when water adheres and has excellent adhesion to UV ink. A white laminated polyester film comprising a polyester resin layer and a coating layer on at least one surface of the polyester film substrate, the coating layer being formed by curing a composition containing a urethane resin with a polycarbonate structure and a branched structure, a crosslinking agent, and a polyester resin. The crosslinking agent is preferably a compound containing three or more blocked isocyanate groups.