Methods for producing pressware
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Solution Overview
Problem
Machinery for producing pressware, such as paper plates, is limited by the inefficiency of forming and ejecting pressware products due to the need for the formed product to clear the die before new material can enter, leading to slow production rates and complex indexing issues in pre-cut blank handling processes.
Innovation Solution
The system employs an upper and lower moveable platen, a stationary platen, and punch platen, with forming die assemblies that allow for the movement of forming dies to retract and eject pressware products while feeding and cutting web material, enabling simultaneous feeding and ejection operations to increase production speed and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the formed pressware must clear the die before new material can enter, then the forming operation is simple and reliable, but the production speed is limited and time is lost
Solution Approach 1:
The patent introduces a vertical dimension to the ejection process by using an adjustable platen that can move upward to lift formed pressware above the web feed plane. This dimensional change allows ejection to occur in the vertical direction rather than requiring horizontal clearance, enabling simultaneous web feeding and pressware ejection without interference, thus resolving the contradiction between reliable forming and high productivity
Solution Approach 2:
The patent employs dynamic, adjustable platens that can move independently in vertical directions. The lower platen can be adjusted to different heights and the upper platen can move to eject pressware. This dynamic capability allows the system to optimize the timing and position of ejection relative to web feeding, enabling faster cycle times while maintaining forming reliability through controlled movement sequences
2Device complexity
If pre-cut blanks are handled on the same plane, then the feeding process is simple, but complicated indexing is required and time is lost
Solution Approach 1:
The patent elevates the ejection process to a higher vertical plane using an adjustable lower platen that can lift formed pressware above the web feed plane. This dimensional separation allows the web feeding and indexing to occur on the original plane without requiring complex indexing mechanisms, as the pressware ejection no longer interferes with the web feeding path, thus reducing both device complexity and time loss
Solution Approach 2:
The patent uses an adjustable lower platen that can be positioned in advance to the appropriate height before forming begins. This preliminary positioning ensures that when forming is complete, the pressware can be immediately ejected upward without requiring complex real-time indexing adjustments, thereby reducing indexing time and simplifying the overall feeding process
Data Source
AI summary
Systems and methods for producing pressware are provided. In one or more embodiments, a method for producing pressware can include producing a pressware product between an upper forming die and a lower forming die contained within a forming die assembly, retracting at least a portion of the upper forming die from the pressware product, and ejecting the pressware product from the lower forming die while feeding a web material between the upper forming die and the lower forming die. The method can also include cutting a segment of the web material to produce a substrate, and pressing the substrate between the upper forming die and the lower forming die to produce another pressware product.