Inductive Welding of Cardboard Containers via Multi-Unit Gripping
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Solution Overview
Problem
Conventional equipment for manufacturing containers from cardboard-based materials faces challenges in increasing production rate due to insufficient time for the weldable layer to heat up, cool, and harden before containers are removed and transported, often resulting in damaged and leaking joints.
Innovation Solution
An apparatus and method that simultaneously handle multiple containers during the welding process, using inductive heating to melt the weldable layer, with a transferring and positioning arrangement to grip and position containers for efficient welding and cooling, allowing for a higher production rate without compromising joint quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional equipment transports containers one by one through the welding unit, then the equipment structure is simple, but the production rate is low because the weldable layer does not get sufficient time to heat up, cool and harden
Solution Approach 1:
The patent merges multiple container handling operations into a single coordinated system. The movable gripping arrangement simultaneously grips and transports multiple containers through the welding unit, while the transferring and positioning arrangement coordinates their transfer from the conveyor. This consolidation of operations into integrated moving and positioning systems enables multiple containers to be processed in parallel, significantly increasing production rate without creating overly complex individual components
Solution Approach 2:
The patent employs dynamic, movable gripping arrangements that can adapt their position and configuration to accommodate multiple containers. The gripping arrangement moves synchronously with the containers through the welding unit, and the transferring arrangement dynamically positions containers as they are transferred. This dynamic capability allows the system to handle multiple containers simultaneously while maintaining precise control over each container's position and orientation, enabling higher production rates
2Productivity
If the transportation speed is increased to boost production rate, then more containers can be processed per unit time, but the weldable layer does not cool and harden properly, resulting in damaged and leaking joints
Solution Approach 1:
The patent implements a controlled pause in the transportation process during the welding operation. The movable gripping arrangement holds containers stationary within the welding unit for a predetermined time, allowing the weldable layer to cool and harden properly before the next transportation cycle begins. This preliminary cooling action ensures joint quality is maintained while still achieving high production rates through parallel processing of multiple containers
Solution Approach 2:
The system employs periodic cycles of transportation, welding, and cooling. Containers are moved into position, held stationary for the welding and cooling duration, then transported away to make room for the next batch. This periodic operation pattern creates rhythmic intervals where welding and cooling occur at optimal speeds, ensuring joint reliability while maintaining overall high production throughput through continuous cycling
3Productivity
If multiple containers are handled simultaneously, then the production rate increases, but the transferring and positioning arrangement must ensure proper gripping which adds operational complexity
Solution Approach 1:
The movable gripping arrangement is designed as a universal system that can simultaneously grip and transport multiple containers of the same type through the welding unit. The gripping mechanism incorporates multiple gripping elements that can engage with several containers in parallel, and the transferring arrangement uses corresponding positioning features to accommodate multiple containers. This multi-functional design enables the system to handle multiple containers simultaneously with a single coordinated operation, increasing production rate while keeping the operational interface relatively simple
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 approach doubles the processing time for each container, enabling effective welding and cooling, and reduces transportation speed and acceleration forces, resulting in a higher output while maintaining joint quality, with a preferred handling of 2-6 containers simultaneously.
Implementation Method 1
a welding unit configured to fasten an end closure to the container body, said welding unit comprising an inductive welding energy generator for melting of the weldable layer
Implementation Method 2
a welding unit configured to fasten an end closure to the container body, said welding unit comprising an inductive welding energy generator for melting of the weldable layer
Implementation Method 3
an inductive welding energy generator for melting of the weldable layer
Data Source
AI summary
The invention concerns an apparatus for manufacturing of containers from blanks of a cardboard based material, said apparatus comprising: a container body forming unit configured to form a cylindrical container body from a substantially plane blank of a multilayer material comprising at least a supporting cardboard layer and a weldable layer; a welding unit configured to fasten an end closure to the container body, said welding unit comprising an inductive welding energy generator for melting of the weldable layer; and transporting means configured to transport a flow of body blanks to the container body forming unit, to transport a flow of container bodies from the container body forming unit to the welding unit, and to transport a flow of container bodies provided with end closures from the welding unit. The invention is characterized in that the transporting means comprises: a first movable gripping arrangement configured to grip at least two container bodies and move these container bodies simultaneously to the welding unit; and a transferring and positioning arrangement configured to transfer container bodies from the container body forming unit to the first movable gripping arrangement and to position the container bodies in a controlled manner to ensure that the first movable gripping arrangement can grip the at least two container bodies properly, wherein the welding unit is configured to simultaneously fasten an end closure to each of the at least two container bodies. The invention also concerns a method for operating an apparatus of the above type.