Auto Catch Apparatus for Continuous CMP Pad Manufacturing
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Solution Overview
Problem
Existing methods for manufacturing polishing pads for chemical mechanical planarization require manual intervention, leading to defects like 'sling defects' and inefficiencies due to the need to stop and restart the pouring of urethane forming mixture after each mold is filled, resulting in raw material waste and safety hazards.
Innovation Solution
An apparatus with a set of releasable plates and a dispenser unit that enables continuous pouring of a curable fluid stream into molds, using an actuator frame to cut the fluid stream when full and release plates for collection, allowing for seamless transition to new molds without manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual intervention is used to stop pouring after each mold is filled, then the mold can be properly filled, but sling defects occur and raw material is wasted
Solution Approach 1:
The patent divides the pouring control function into two independent components: (1) automated sensor-based detection of mold fill level, and (2) automated pump control system. This segmentation eliminates the need for manual intervention and allows precise control of the pouring process, preventing both under-filling and over-filling that causes material waste and sling defects.
Solution Approach 2:
The patent implements a feedback control system where sensors detect the fill level of the mold in real-time and automatically signal the pump to stop pouring when the desired level is reached. This closed-loop feedback mechanism ensures precise mold filling without manual intervention, eliminating sling defects and reducing raw material waste from over-pouring.
2Ease of operation
If manual intervention is required to stop and restart pouring, then the process can be controlled, but productivity decreases and safety hazards increase
Solution Approach 1:
The patent implements a self-service automated system where the pouring process controls itself through sensor detection and automatic pump operation. The system autonomously monitors mold fill level, activates the pump when needed, and stops when the mold is full, eliminating the need for continuous manual monitoring and intervention. This automation dramatically improves productivity while maintaining precise process control.
3Quantity of substance
If the pouring stream is stopped after each mold, then material costs are reduced, but lower yields occur and material waste increases
Solution Approach 1:
The patent enables continuous pouring operation by implementing automated pump control that maintains continuous material flow through multiple molds without manual interruption. The sensor-based system automatically manages the continuous process, ensuring each mold receives the precise amount needed while maintaining uninterrupted production flow, thereby maximizing both yield and material efficiency.
Data Source
AI summary
The present invention provides an apparatus for use in mixing and dispensing a curable fluid stream (stream) into an open mold to fill the mold to make polishing pads for chemical mechanical planarization of substrates. The apparatus comprises an actuator frame on which is mounted (i) a set of two plates releasably attached to the actuator frame and adapted to cut the stream when the mold is full and to release from the actuator frame after cutting the stream, and (ii) a dispenser unit for continuous pouring of the stream into an open mold, the apparatus adapted to enable removal of the released plates from the actuator during the continuous pouring after the mold is full, e.g. by raising the actuator frame and the (ii) dispenser unit, whereby one can place a container above the mold to catch the plates.