Injection Molded Spout Opening Device for Food Packaging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing packaging solutions for pourable food products that require both liquid and gas sealing face challenges in opening, as the membrane must detach from the spout and tear through the gas-barrier material, resulting in jagged edges and impaired pour-out, especially with materials like aluminum.
Innovation Solution
An injection molding method is developed to apply a plastic opening device to sheet packaging materials, where the opening device is injection molded with a spout and pull ring, piercing through and resealing the gas-barrier layer, ensuring effective gas sealing and smooth opening without fraying the barrier material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the membrane is detached from the spout and the gas-barrier material is torn through, then the package can be opened, but the edges become jagged and the pour-out is impaired
Solution Approach 1:
The opening device is pre-formed with a spout that pierces through the gas-barrier material during the packaging process, creating a clean opening before the package is sealed. This preliminary piercing action eliminates the need for later tearing through the barrier material, thus maintaining edge smoothness while enabling easy opening operation.
2Reliability
If the opening device is fitted to the packaging material with direct membrane fixation, then gas sealing is maintained, but the barrier material must be torn through resulting in frayed edges
Solution Approach 1:
The spout acts as an intermediary element that is integrated into the packaging structure. It pierces through the gas-barrier material and is sealed by plastic material, creating a controlled opening mechanism. This intermediary structure maintains gas sealing integrity while providing a smooth opening experience without requiring the user to tear through the barrier material.
3Manufacturing precision
If the gas-barrier material is pierced and resealed with plastic material, then smooth pour-out is achieved, but the injection molding process becomes more complex
Solution Approach 1:
The opening device, including the spout and sealing structures, is integrated into a single injection molded component. This merging of multiple functions (piercing, sealing, and opening mechanisms) into one molded part simplifies the overall manufacturing process despite the complexity of the piercing and resealed structure, as it eliminates the need for separate assembly steps.
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
The method allows for easy opening and smooth pour-out of food products while maintaining gas-sealing properties, as the gas-barrier material is pierced neatly and resealed by the plastic material, eliminating the need to tear through it, thus improving the opening and pour characteristics of packaged food products.
Implementation Method 1
a method of injection molding an opening device on a sheet packaging material
Data Source
AI summary
A method of injection molding an opening device on sheet packaging material for packaging pourable food products; the packaging material has at least a first and a second layer, and an opening formed through the first layer and sealed by a cover portion of the second layer; the method includes the steps of injecting molten plastic material onto a first side of the cover portion of the second layer, feeding the molten plastic material along the cover portion to cover it on the first side, and feeding the molten plastic material through an annular peripheral portion of the cover portion to form a spout of the opening device projecting from a second side, opposite the first side, of the cover portion; the molten plastic material covers the cover portion to define, with the cover portion, a user-removable sealing portion of the spout.