Laminated Packaging Web Drying With IR and Hot Air Balance
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Solution Overview
Problem
Existing methods for manufacturing laminated packaging material webs face challenges in maintaining the moisture content of the paperboard layer, leading to issues such as cracking, delamination, and defects in the final packaging containers due to uneven drying, especially when using water-based inks and infrared radiation.
Innovation Solution
A continuous in-line method combining infrared radiation and hot air drying is used to control the moisture content of the paperboard layer, adjusting the ratio between infrared radiation and hot air flow to ensure precise drying without over-drying, and applying a print substrate layer to enhance drying efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If infrared radiation is used to dry the paperboard layer after digital printing, then the drying speed is improved, but the moisture content of the paperboard layer is reduced excessively causing cracking and quality degradation
Solution Approach 1:
The patent combines infrared radiation drying with hot air drying to achieve both fast drying and moisture content control. The infrared radiation provides rapid evaporation of water from the printed areas, while the hot air flow simultaneously supplies moisture to the paperboard layer, preventing excessive moisture loss and cracking.
Solution Approach 2:
The patent changes the drying parameters by introducing hot air flow with controlled temperature and humidity. The hot air temperature is maintained between 40-80°C and humidity between 30-70%, creating optimal drying conditions that prevent both under-drying and over-drying of the paperboard layer.
2Manufacturing precision
If the paperboard layer is dried to ensure ink drying, then the printed design quality is improved, but the paperboard layer cracks when creased reducing final product quality
Solution Approach 1:
The patent applies different drying conditions to different areas of the paperboard layer. The printed areas receive intensive infrared radiation for complete ink drying, while the unprinted areas receive moisture from hot air flow to maintain flexibility and prevent cracking during creasing.
3Productivity
If stronger drying is applied to dry the paperboard layer, then the ink drying is improved, but the moisture loss varies with printed design and color causing uneven drying
Solution Approach 1:
The patent implements a feedback control system that monitors the moisture content of the paperboard layer in real-time. Sensors detect moisture levels, and the system automatically adjusts the infrared radiation intensity and hot air flow parameters to maintain uniform drying across different areas and colors.
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 method maintains the paperboard moisture content between 4% and 8.5%, preventing defects and ensuring the quality of the laminated packaging material web, while being time-efficient and cost-effective.
Implementation Method 1
drying the décor layer by exposing the paperboard layer to infrared radiation
Implementation Method 2
drying the décor layer by exposing the paperboard layer to infrared radiation
Implementation Method 3
drying the décor layer by exposing the paperboard layer to infrared radiation and a flow of hot air
Implementation Method 4
drying the décor layer by exposing the paperboard layer to infrared radiation and a flow of hot air
Implementation Method 5
applying a print substrate layer to enhance drying efficiency
Data Source
AI summary
A continuous in-line method for manufacturing a laminated packaging material web, comprising: ink-jet printing a décor layer on a paperboard layer; drying the décor layer by exposing the paperboard layer to infrared radiation and a flow of hot air; and laminating at least a further layer to the printed and creased paperboard layer.