Printed Laminate Graphic Registration via Strain Adjustment
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Solution Overview
Problem
The existing methods for manufacturing printed laminates in absorbent articles often result in incomplete or offset repeating graphics sets, leading to increased waste and reduced consumer perception of quality, as well as higher production costs due to excessive trimming.
Innovation Solution
The method involves adjusting the machine direction strain in materials with repeating graphic sets to align them with a predetermined laminate pitch, using sensors and strain adjusting devices to ensure full graphic sets are maintained without excessive trimming, and integrating elastic members like elastic strands for improved alignment and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the repeating graphic set length in the first material is not adjusted to match the predetermined laminate pitch, then the manufacturing process is simple, but the graphic sets become misaligned or cut off, reducing product quality
Solution Approach 1:
The patent applies preliminary action by measuring the repeating graphic set length and adjusting the strain in the first material before the lamination process. The sensor detects the graphic set length, and the strain adjusting device modifies the material properties upstream, ensuring proper alignment is established prior to joining materials. This prevents misalignment issues from occurring in the first place.
Solution Approach 2:
The patent implements feedback control by using a sensor to continuously monitor the repeating graphic set length in the first material and automatically adjusting the strain through a strain adjusting device based on the measured values. This closed-loop system ensures that the graphic set length consistently matches the predetermined laminate pitch, maintaining high alignment precision.
2Manufacturing precision
If excessive trimming is performed to remove misaligned graphic sets, then alignment precision may be improved, but material waste increases and production costs rise
Solution Approach 1:
The patent prevents material waste by performing strain adjustment before lamination, ensuring graphic sets are properly aligned in the first place. By establishing correct registration upstream in the process, the need for subsequent trimming and removal of misaligned sections is eliminated, thereby preventing material loss.
Solution Approach 2:
The patent converts the potential harm of misaligned graphic sets into a benefit by using the measurement and adjustment system to proactively correct alignment issues. Instead of allowing misalignment to occur and then trimming it away (which creates waste), the system preemptively ensures proper alignment, turning a potential quality problem into an opportunity for consistent, waste-free production.
3Productivity
If the strain in the first material is adjusted to match the predetermined laminate pitch, then full graphic sets are maintained without trimming, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies self-service by implementing an automatic feedback control system where the sensor continuously monitors the graphic set length and the strain adjusting device automatically modifies the material properties based on real-time measurements. This eliminates the need for manual intervention or complex post-processing operations, allowing the system to self-regulate and maintain optimal alignment throughout production.
Solution Approach 2:
The patent replaces manual alignment operations with an automated sensor-based measurement and control system. Instead of relying on mechanical trial-and-error adjustment or post-lamination trimming, the system uses optical or electronic sensing to detect graphic set length and automatically controls strain through a driven roll or similar device, substituting mechanical precision work with automated control.
Data Source
AI summary
Methods for manufacturing printed laminates or elastic printed laminates are disclosed. The printed laminates may have a first extensible material and a second extensible material. The first extensible material may have a plurality of repeating graphic sets each having a repeating graphic set length. The first extensible material may have a first strain and the second extensible material may have a second, different strain. The second strain may be constant. The first strain may be variable to correspond to the repeating graphic set lengths to a predetermined laminate pitch. The first and second extensible material may be joined together at a point of joinder. An elastic member, such as a plurality of elastic strands, for example, may be positioned intermediate the first and second extensible materials to form an elastic laminate.