Disposable Beverage Lid Offset Printing Registration
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Solution Overview
Problem
Existing methods for applying graphic images to disposable beverage container lids, such as stickers or post-fabrication printing, face issues with adhesive failure, distortion, and high costs due to the need for precise orientation and multiple printing passes, which fail to effectively draw consumer attention with lack of contrasting colors.
Innovation Solution
A method involving passing a sheet of plastic through an offset printing process to directly print images with heat-resistant inks, using registration marks for alignment, followed by thermoforming and die-cutting to create lids with graphic images in specific locations, ensuring correct positioning and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If stickers with adhesive are applied to the lid after thermoforming, then contrasting colors and graphic images are achieved, but the adhesive becomes exposed to hot and moist conditions causing wrinkles or peeling
Solution Approach 1:
The patent applies graphic images to the plastic sheet before thermoforming rather than after. The printing process occurs on the flat sheet material, and the images are then thermally transferred or printed directly onto the formed lid surface, avoiding subsequent adhesive application that would be exposed to hot and moist conditions.
Solution Approach 2:
The patent eliminates the adhesive layer entirely by using direct printing or thermal transfer methods that bond graphics directly to the lid surface without requiring adhesive substances, thereby removing the source of adhesive failure in hot and moist environments.
2Ease of manufacture
If printing is performed after lid fabrication, then graphic images can be applied, but the lids must be perfectly oriented and positioned which adds complexity and cost
Solution Approach 1:
The patent performs printing on the flat plastic sheet before thermoforming, when the material is still in a simple, flat state that is easy to position and print on. Registration marks are applied to the flat sheet to guide subsequent printing passes, eliminating the need for complex positioning systems required when printing on three-dimensional formed lids.
Solution Approach 2:
The patent changes the dimensionality of the substrate from a three-dimensional formed lid to a two-dimensional flat sheet for the printing operation. This dimensional change simplifies the printing process by providing a stable, flat surface that is easier to position, orient, and print on compared to curved or irregular lid surfaces.
3Ease of manufacture
If multiple printing passes are used to apply multiple colors, then complete graphic images are achieved, but the process time and cost increase due to drying requirements between passes
Solution Approach 1:
The patent combines multiple printing operations into a single continuous printing pass by using a multi-color printing system where all color stations are arranged in sequence. The plastic sheet passes through all printing stations in one continuous motion, receiving all colors simultaneously without stopping for drying between passes.
Solution Approach 2:
The patent maintains continuous printing action by eliminating drying periods between color applications. The printing system is designed so that ink application and ink drying occur simultaneously or in overlapping time periods, with the sheet moving continuously through the printing and drying zones without interruption.
4Ease of manufacture
If conventional printing inks are used on lids that undergo thermoforming, then graphic images are applied, but the images distort or fade during the high-temperature thermoforming process
Solution Approach 1:
The patent changes the thermal properties of the printing ink by selecting heat-resistant ink formulations that can withstand the high temperatures of the thermoforming process without degrading, fading, or distorting. The ink is specifically chosen or modified to have a higher thermal stability threshold than conventional printing inks.
Solution Approach 2:
The patent applies the printing process before thermoforming, allowing the ink to be deposited on the flat sheet and then bonded to the lid surface during the thermoforming process itself. The high heat and pressure of thermoforming actually enhance ink bonding to the plastic surface, and the heat-resistant ink formulation ensures the image survives the process intact.
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
This solution provides durable, aesthetically pleasing lids with clear graphic images that resist distortion during thermoforming and are cost-effective, ensuring the images remain visible and intact throughout use.
Implementation Method 1
A sheet of plastic is passed through an offset printing process to directly print images at multiple discrete locations on the sheet
Implementation Method 2
Multiple lids are thermoformed into the printed plastic sheet
Data Source
AI summary
A lid for a disposable beverage container. A sheet of plastic is passed through an offset printing process to directly print images at multiple discrete locations on the sheet. During printing, registration marks are printed on the sheet. These marks are used to align the sheet correctly for subsequent printing runs in which additional colors are added to the images. The registration marks are also used to correctly position the printed sheet on a mold. Multiple lids are thermoformed into the printed plastic sheet. The registration marks are subsequently used to correctly position the thermoformed printed sheet with a die-cutter to separate the multiple printed and formed lids from the sheet. The images are printed in non-heat sensitive inks as these will resist distortion of the printed images during the thermoforming process. Preferably each image is printed so that it ends up in a depression on the eventually formed lids.