Continuous Motion Wrapping Heated Cutting Element
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Solution Overview
Problem
Existing wrapping machines for products like napkins and toilet paper rolls are limited by the need for reciprocating motions and transverse cutting, which reduces production speed and causes shock and vibration, and often fail to achieve fully compressed or tightly wrapped products due to inefficient infeed and cutting systems.
Innovation Solution
A continuous motion wrapping system using a heated cutting element that moves in two orthogonal directions within the same velocity as the tube, allowing for separation of products without sealing the tube, and an infeed system that eliminates flighted infeed systems and slave-driven mechanisms, enabling compression and high-speed wrapping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If reciprocating motion and transverse cutting are used in wrapping machines, then the cutting and separation of products can be achieved, but production speed is reduced and shock and vibration occur
Solution Approach 1:
The tube is pre-formed and continuously fed before the cutting operation. Products are pre-positioned within the tube during continuous motion, allowing the cutting element to simply sever the tube at predetermined intervals without requiring complex reciprocating motions or transverse cutting mechanisms
Solution Approach 2:
The wrapping process maintains continuous motion throughout, with the tube continuously fed and products continuously wrapped. The cutting element operates in continuous motion alongside the tube, eliminating the stop-start reciprocating cycles of traditional machines and enabling sustained high-speed operation without shock and vibration
2Manufacturing precision
If transverse cutting is performed on continuously fed tube, then product separation is achieved, but fully compressed or tightly wrapped product cannot be obtained
Solution Approach 1:
The traditional mechanical transverse cutting system that required stopping and repositioning the tube is replaced with a cutting element that moves in continuous motion with the tube. This substitution allows the tube to remain under continuous compression while being cut, maintaining tight wrapping without sacrificing productivity
Solution Approach 2:
The cutting element is designed to move dynamically with the continuously fed tube, matching its speed and position. This dynamic approach allows cutting to occur without disrupting the continuous compression force applied to the products, enabling both tight wrapping and high productivity
3Ease of operation
If flighted infeed systems slave-driven by upstream folder machines are used, then product feeding can be achieved, but flight jams occur due to timing issues
Solution Approach 1:
The infeed system is segmented into independently controlled sections with individual timing and speed control for each segment. This allows precise synchronization of product delivery to the tube without the timing conflicts that cause flight jams in slave-driven systems
Solution Approach 2:
The infeed system operates with independent timing and control mechanisms rather than being slave-driven by upstream machines. Each section serves itself with autonomous speed and position control, eliminating the timing dependency that causes flight jams in traditionally synchronized systems
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 achieves higher production speeds with continuous motion wrapping, eliminates the need for transverse cutting, and ensures products are compressed and tightly wrapped without damage, improving efficiency and reducing vibration.
Implementation Method 1
separating the spaced product units in the tube from one another with a heated cutting element
Implementation Method 2
The heated cutting element moves in two orthogonal directions... separating spaced product units... by thermal cutting with a heated element
Data Source
AI summary
A method, system, and apparatus for separating products, such as napkins or rolls of paper, encased in a tube of continuously moving thermoplastic wrapping material into product units is disclosed. At predetermined intervals spaced products are fed into the tube at wrapper length intervals, and the tube is thermally cut at wrapper intervals to form individually girth wrapped articles.