Feeding Table Pressure Rollers for Plastic Film Bundling
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Solution Overview
Problem
Existing plastic film wrapping machines face challenges in achieving homogeneous contact pressure between rollers, leading to tension variations and irregular cuts due to differences in roller diameters and coatings, as well as variations in plastic film thickness and type, resulting in inconsistent wrapping performance.
Innovation Solution
An unalterable pressure application system using helical springs and pushers is introduced between the beam and pressure rollers to maintain consistent tangential contact, ensuring uniform pressure across the width of the plastic film, with adjustable elements for accommodating different film thicknesses and types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pressure rollers with different diameters and coatings are used in the tension couple, then space constraints and rigidity requirements are met, but homogeneous contact pressure over the film width cannot be achieved
Solution Approach 1:
The patent applies different properties to different parts of the roller system. Specifically, the tension couple rollers have different diameters and coatings (rubber-type on one, steel on the other) to meet local requirements of space constraints and rigidity, while the pressure couple rollers are designed with identical properties to ensure homogeneous contact pressure across the film width.
Solution Approach 2:
The patent ensures homogeneity in the pressure couple by using rollers with identical diameter and coating material (rubber-type). This homogeneous design guarantees uniform contact pressure distribution across the entire film width during the cutting operation, resolving the precision issue.
2Manufacturing precision
If pressure is increased between rollers to compensate for tension variations, then cutting quality may improve, but film deformation and tension variations worsen due to incompatible roller properties
Solution Approach 1:
The patent divides the roller system into two functional segments: the pressure couple (upstream) dedicated to ensuring homogeneous contact pressure for cutting, and the tension couple (downstream) dedicated to providing tension. This segmentation allows each pair to optimize its function without interfering with the other, preventing film deformation.
3Manufacturing precision
If the tension couple roller configuration is changed to achieve homogeneous pressure, then contact pressure uniformity improves, but the ability to accommodate different film thicknesses and types is reduced
Solution Approach 1:
The patent introduces adjustable elements in the pressure couple roller system, allowing the roller properties (such as pressure and positioning) to be dynamically adjusted. This enables the system to adapt to different film thicknesses and types while maintaining homogeneous contact pressure through the adjustable mechanism.
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 solution ensures a simple and permanent homogeneity of contact pressure, reducing tension variations and improving the cleanliness and consistency of plastic film cuts, thereby enhancing the wrapping process and reducing operational incidents.
Implementation Method 1
the pressure application system consists of at least one helical spring arranged on the reference beam, said spring being associated with a pusher which is guided with respect to said beam, which pusher is in contact and in permanent support on the frame of the driven pressure roller, urged by said spring
Data Source
Figure 1~3
AI summary
The invention relates to an feeding table, comprising a pair of rollers (13, 14), referred to as pressers, arranged downstream from the cutting system, said pair including a motor-driven roller (13) and at least two driven rollers (14) which are arranged so as to form at least two pressure tracks engaging with the plastic film (6) moving between said pair of rollers (13, 14). Each pressure track includes a driven roller (14), the shaft (23) of which is supported by a mobile frame (19) that is guided on a beam (20), wherein said beam (20) is secured to the general frame (2) and a foolproof system for applying pressure is provided between said beam (20) and said frame (19) in order to restrain said driven roller (14) and hold the latter in tangential contact with the motor-driven roller (13).