Winding Mandrel Film Transfer Device for Vertical Stretch Film Removal
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Solution Overview
Problem
Existing defoliating devices face challenges in efficiently removing stretch films from winding mandrels, as they tend to stick together and require manual labor, while wound shrink films necessitate reversing the mandrel's direction for removal.
Innovation Solution
A method and device that utilize a transfer device with grippers to withdraw and dispose of the film from the mandrel, allowing for horizontal and vertical displacement, and incorporating rollers with friction-minimizing coatings or suction systems for efficient film removal, especially suitable for stretch films that stick together.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the film is removed by gravity alone, then the removal process is simple, but the removal speed is very slow and labor-intensive
Solution Approach 1:
The system uses the film's own protrusion beyond the mandrel end as the engagement point for the transfer device, allowing the film to essentially remove itself without requiring complex unwinding mechanisms. The transfer device simply needs to grasp and pull the protruding film end.
Solution Approach 2:
The film protrudes beyond the mandrel end, extracting the engagement point from the wound film mass to a accessible location. This allows the transfer device to grasp the film without needing to penetrate or unwrap the entire film roll.
2Productivity
If stretch films are used, then they provide good wrapping performance, but they tend to stick together and adhere to the mandrel
Solution Approach 1:
The film is designed to protrude beyond the mandrel end, extracting the removal point from the adhered film mass. This allows the transfer device to grasp and pull the film off without needing to overcome the adhesion forces across the entire film- mandrel contact area.
Solution Approach 2:
The protruding film end acts as an intermediary handle that the transfer device can grasp. This intermediary point allows force application without directly interacting with the adhered film sections stuck to the mandrel surface.
3Device complexity
If the mandrel is vertically oriented and supported only at the upper end, then the structure is simplified, but the film removal becomes more difficult without mechanical assistance
Solution Approach 1:
The vertically oriented mandrel with free lower end allows the film to naturally protrude downward due to gravity and wind-on tension. This self-formed protrusion serves as the engagement point for the transfer device, combining structural simplicity with effective removal capability.
Solution Approach 2:
The film is intentionally allowed to protrude beyond the mandrel end during the winding process. This preliminary positioning of the film end creates a ready-to-grasp engagement point for the transfer device, eliminating the need for additional removal mechanisms.
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
Enables quick and easy removal of films from the mandrel, reducing manual labor and ensuring efficient film transfer to a disposal area without manual intervention, applicable to various types of films including stretch films.
Implementation Method 1
a suction system can be used, including a suction opening, to transport the film that is in the peeling process
Implementation Method 2
at least one driven roller that interacts with the adjacent section of the winding mandrel to peel off the film
Data Source
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AI summary
The invention relates to a method for taking over a film (3), preferably a wound stretch film, wound on a winding mandrel (5), which is in particular vertically oriented and preferably mounted exclusively in the region of its upper end, of a defoliation device, wherein the film (3) wound on the winding mandrel (5) is taken off the winding mandrel (5) by means of at least one taking device (7) when the winding mandrel (5) reaches the take-over position and is fed to a disposal area.Furthermore, the invention relates to a device for receiving a film (3), preferably a wound stretch film, wound on a winding mandrel (5), which is in particular vertically oriented and preferably mounted exclusively in the region of its upper end, of a peeling device, in particular for carrying out the method according to one of the preceding claims, wherein the device comprises at least one receiving device (7) for pulling off the film (3) wound on the winding mandrel (5) when the receiving position of the winding mandrel (5) is reached.