Film Tube Pull-Down Method for Load Stability
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Solution Overview
Problem
Existing methods for covering a stack of objects with a film tube or hood often fail to provide sufficient stability, particularly in the lower region, and additional strapping measures are complicated and unreliable.
Innovation Solution
A method involving a gathering device with roller assemblies and a pull-down device that engages the film tube with gathering rollers on the outside and counter rollers on the inside to ungather and re-gather the film tube over the stack, allowing for adjustable speed and direction to create tube pieces that enhance stability, using the film tube's elasticity to secure the load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If additional strapping is used to improve load stability, then stability may be improved, but the process becomes complicated and reliability decreases
Solution Approach 1:
The invention extracts the stabilizing function from separate strapping operations and integrates it into the film tube application process itself. The film tube is used both for covering and for stabilizing the load through controlled folding and tensioning, eliminating the need for additional strapping devices and operations.
Solution Approach 2:
The invention merges the covering function and the stabilizing function into a single integrated process. The film tube serves dual purposes: protecting the load and providing structural stability through its folding pattern and tensioning, combining what were previously separate operations into one unified process.
2Productivity
If the film tube is pulled down quickly to increase productivity, then productivity improves, but the stability and quality of coverage deteriorates
Solution Approach 1:
The invention employs dynamic control of the film tube application process, allowing the system to adapt the pulling speed and folding pattern in real-time. The controlled folding mechanism adjusts the film tube's deployment rate to maintain optimal tension and coverage quality while maximizing overall application speed.
Solution Approach 2:
The invention changes key parameters during the application process, including the pulling speed, folding frequency, and tension levels. By dynamically adjusting these parameters, the system maintains high productivity while ensuring consistent coverage quality and load stability throughout the application process.
3Manufacturing precision
If the film tube is gathered tightly to improve coverage, then coverage quality improves, but the difficulty of ungathering increases
Solution Approach 1:
The invention segments the film tube into controlled sections or folds during the gathering process. This segmentation allows the film tube to be tightly gathered for precise coverage while maintaining defined fold patterns that facilitate easier ungathering and removal when needed, as each segment can be independently managed.
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 method effectively increases the stability of the load in a simple and reliable manner, even with high-friction film tubes, by creating uniform folds and securing the film tube over the stack without losing initial tension during transport or storage.
Implementation Method 1
the gathering rollers are engaged with the outside surface of the film tube
Implementation Method 2
both counter rollers of each roller assembly are in contact with the inside surface of the film tube
Implementation Method 3
using the film tube's elasticity to secure the load
Data Source
AI summary
The invention relates to a method for drawing a tubular film (1) over a stack of goods (2), wherein the tubular film is first gathered on a gathering device (R/Ü). The gathered tubular film is then drawn over the stack of goods using a covering device, in that the covering device is moved along the stack of goods and the tubular film is thereby ungathered. After reaching an end region of the stack of goods, the covering device is moved along a segment of the stack of goods (Λ) opposite the covering direction, so that a first tubular film segment (15) is laid on the tubular film already contacting the stack of goods. The covering device is then moved along at least part of the segment of the stack of goods in the covering direction again, so that a second tubular film segment (16) is laid on the first tubular film segment.