Laminated Packaging Web Drying for Paperboard Moisture Control
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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 infrared radiation for ink drying.
Innovation Solution
A continuous in-line method combining infrared radiation and hot air drying is employed to control the moisture content of the paperboard layer by adjusting the ratio between infrared radiation and hot air flow, ensuring precise moisture control and minimizing moisture loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If infrared radiation is used for drying the décor layer, then drying speed is improved, but moisture content of the paperboard layer is reduced causing cracking
Solution Approach 1:
The drying process is segmented into two distinct stages: first infrared radiation drying for rapid moisture removal, then hot air drying for uniform moisture distribution. This segmentation allows each drying method to perform its optimal function without the negative effects of either used alone.
Solution Approach 2:
The drying process uses periodic action by alternating between infrared radiation exposure and hot air flow in a controlled sequence. The infrared radiation provides intense rapid drying followed by hot air that evenly distributes moisture, creating a periodic cycle that achieves both speed and uniformity.
2Productivity
If higher power infrared radiation is used, then drying efficiency is improved, but paperboard layer cracks due to excessive moisture loss
Solution Approach 1:
The hot air drying stage acts as a beforehand cushioning measure that prepares the paperboard layer for the intense infrared radiation by creating a moisture buffer. This prevents the paperboard from becoming too dry and cracking when exposed to high-power infrared radiation.
Solution Approach 2:
Hot air serves as an intermediary between the infrared radiation and the paperboard layer. It mediates the moisture transfer process by providing a controlled environment that prevents direct excessive moisture loss from the paperboard during infrared exposure.
3Use of energy by moving object
If infrared radiation alone is used for drying, then energy consumption is reduced, but even drying cannot be provided leading to defects
Solution Approach 1:
The invention merges two drying methods (infrared radiation and hot air drying) into a single integrated process. This combination leverages the energy efficiency of infrared radiation while adding the drying uniformity of hot air, achieving both low energy consumption and even drying.
Solution Approach 2:
The drying system uses a composite approach by combining two different energy transfer mechanisms (radiative heating from infrared and convective heating from hot air). This composite drying method provides the benefits of both individual methods while mitigating their respective drawbacks.
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 layer 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 and a flow of hot air
Data Source
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AI summary
A continuous in-line method for manufacturing a laminated packaging material web, comprising: ink-jet printing a decor layer on a paperboard layer; drying the decor 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.