Extensible Film Packaging Cutting Unit with Heated Blades
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Solution Overview
Problem
Current cutting and welding devices for packaging in extensible plastic film are inefficient, leading to slow packaging times and increased material costs, as they require thicker films and heat-shrinking processes, and are not suitable for rapid intervention in spirally wound products.
Innovation Solution
A cutting unit with movable cutting devices that perform transversal perimetric cutting of continuous packaging bundles moving on a conveyor belt, using heated blades and a double crank mechanism to efficiently separate products into finished groups without the need for heat-shrinking, allowing for adjustable cutting distances and reduced material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cutting and welding devices are used for packaging in extensible plastic film, then the packaging structure is stabilized, but the packaging time increases and productivity decreases
Solution Approach 1:
The invention extracts and eliminates the heat-shrinking step from the packaging process by using extensible plastic film that maintains its form without thermal treatment. The cutting device is also simplified to work exclusively on the extensible film, removing the welding function and associated complexity, thereby speeding up the process while maintaining packaging integrity
Solution Approach 2:
The invention changes the physical parameters of the plastic film by using extensible plastic material with specific elasticity properties instead of heat-shrinkable film. This parameter change allows the film to be stretched during packaging and then retract to stabilize the package structure without requiring heat treatment, thus eliminating the time-consuming heat-shrinking step
2Reliability
If thicker film is used to ensure packaging stability, then the packaging structure is more reliable, but material costs increase
Solution Approach 1:
The invention changes the material parameters by selecting extensible plastic film with optimized thickness and elasticity properties. The film is thin enough to reduce material costs but has sufficient elastic recovery to maintain packaging stability, achieving a better balance between material quantity and structural reliability
Solution Approach 2:
The invention uses composite or specially formulated extensible plastic materials that combine adequate strength, elasticity, and cost-effectiveness. These materials provide the necessary mechanical properties for packaging stability without requiring excessive thickness, thus reducing material consumption and costs
3Reliability
If heat-shrinking process is used to stabilize packaging, then the packaging form is stabilized, but energy consumption increases
Solution Approach 1:
The invention extracts and removes the heat-shrinking process entirely from the packaging line by using extensible plastic film that self-stabilizes through elastic recovery. This eliminates the energy-intensive heating equipment and operational steps, significantly reducing energy consumption while maintaining packaging form stability
Solution Approach 2:
The extensible plastic film performs the stabilization function on its own through its inherent elastic properties, without requiring external energy input from heat-shrinking equipment. The film automatically recovers its shape after being stretched during packaging, providing self-service stabilization that eliminates energy consumption
4Productivity
If cutting devices with rapid intervention are used, then packaging speed increases, but the ability to handle spirally wound products decreases
Solution Approach 1:
The cutting device incorporates dynamic elements that allow it to adapt its cutting path and timing based on the spiral winding pattern of the products. The device can adjust its motion parameters to follow the spiral geometry while maintaining rapid cutting speeds, thus achieving both high productivity and versatility in handling spirally wound products
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 significantly reduces packaging times, minimizes material costs, and eliminates the need for heat-shrinking, resulting in increased productivity and energy savings while maintaining the stability of the packaging form.
Implementation Method 1
using heated blades and a double crank mechanism to efficiently separate products into finished groups
Data Source
AI summary
A cutting method in a packaging machine using extensible film includes feeding products, wound in a continuous packaging or in a bundle of products, to a cutting unit; cutting the continuous packaging into finished groups of products using a movable cutting device that advances with the packaging to be cut and makes a transversal cut along the perimeter of the packaging; and bringing the movable cutting device back and performing a new cutting step simultaneously in two points of the packaging spaced from each other, with two vertical sections cut at a first point and two horizontal sections are cut at a second point to create a finished packaging. The packaging machine includes a cutting device, a slide moving forward and backward, and a side cutting device and an upper and lower cutting device spaced apart and acting simultaneously on the packaging to cut in two points vertically and horizontally.