Digital Printing Transfer Fluid for Polymeric Decorations
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Solution Overview
Problem
Current digital printing systems face challenges in achieving high-resolution, non-blurry decorations on polymeric articles, especially those with tapered surfaces, due to smearing and slurring of ink deposits, and require longer setup and conversion times compared to other printing methods.
Innovation Solution
A digital print system utilizing a rotary carrier with transfer units and a curing unit, where a layer of transfer fluid with specific surface tension and viscosity properties is applied, followed by a decoration-forming deposit, which is then partially cured to increase tackiness and viscosity, allowing precise transfer to polymeric articles without smearing, using inkjet printing and UV curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If digital printing is used on polymeric articles, then productivity is improved, but manufacturing precision deteriorates due to smearing and slurring
Solution Approach 1:
A transfer fluid layer is introduced as an intermediary between the inkjet-deposited decoration-forming material and the polymeric article surface. This transfer fluid prevents smearing and slurring during the transfer process, enabling high-resolution decorations to be maintained while using high-speed digital printing methods.
Solution Approach 2:
The patent controls and optimizes specific parameters of the transfer fluid, including surface tension (about 28-35 dyne/cm) and viscosity (about 10-100 cP), to achieve the desired balance between preventing smear and enabling complete transfer. These parameter adjustments resolve the contradiction between speed and precision.
2Loss of time
If digital printing is used on polymeric articles, then setup time is reduced, but manufacturing precision deteriorates due to smearing on tapered surfaces
Solution Approach 1:
The transfer fluid acts as a mediator that enables direct digital printing onto tapered polymeric surfaces without the smearing problem. This allows the setup time advantage of digital printing to be retained while achieving sharp, precise decorations on complex geometries.
3Manufacturing precision
If transfer fluid is applied before decoration-forming deposit, then manufacturing precision is improved by preventing smear, but device complexity increases
Solution Approach 1:
The transfer fluid application step, while adding a process stage, uses simple and inexpensive materials (such as hydrocarbons, mineral oils, or petroleum jellies) that can be applied through straightforward methods, minimizing the increase in device complexity while achieving the goal of smear prevention.
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 system provides high-resolution, non-blurry decorations on polymeric articles at a higher output rate than traditional digital printing systems, with reduced setup and conversion times, and effectively prevents smearing on articles with tapered surfaces.
Implementation Method 1
The curing unit is configured to at least partially cure the decoration-forming deposit. In illustrative embodiments, the decoration-forming deposit includes an ink and the layer of transfer fluid comprises a hydrocarbon such as petroleum jelly or mineral oil
Implementation Method 2
The decoration-forming deposit has a first surface tension and a first viscosity and the layer of transfer fluid has a second surface tension and a second viscosity. The first surface tension may be about equal to or slightly less than the second surface tension
Data Source
AI summary
A method of printing on a polymeric article includes applying a decoration-forming deposit on a transfer blanket. The method further includes transferring the decoration-forming deposit from the transfer unit to the polymeric article to provide a decoration on the polymeric article.