Vented Sealing Element for Mark-Free Injection Molding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing sealing solutions for molding machines fail to provide controlled venting during the injection molding process, often resulting in venting marks on the final product due to mechanical or flexible seals, and venting channels/chambers do not adequately address this issue.
Innovation Solution
A sealing element with a base body featuring an inner receptacle and an outer surface, equipped with venting ducts that connect the inner receptacle to the outer surface, allowing for proper degassing of semi-liquid molding material without leaving marks, comprising materials like soft foam or hard PTFE, and designed for efficient installation and removal in a mold pocket.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical seals or flexible seals are used to seal the interface between the product and the mold, then sealing effectiveness is improved, but venting capability deteriorates
Solution Approach 1:
The sealing element is divided into distinct functional zones: a sealing region with sealing elements that contact the product, and a venting region with venting ducts that allow gas escape. This segmentation allows the sealing portion to maintain reliable sealing while the venting portion provides controlled gas evacuation pathways, preventing venting marks on the product surface.
Solution Approach 2:
Different regions of the sealing element have different properties: the sealing region has high sealing capability with contact seals, while the venting region has gas-permeable characteristics with ducts or chambers. This local differentiation enables simultaneous achievement of reliable sealing and controlled venting, as each region performs its specialized function without interfering with the other.
2Object-generated harmful factors
If venting channels and chambers are provided in the mold, then venting capability is improved, but product surface quality deteriorates due to venting marks
Solution Approach 1:
The sealing element acts as an intermediary component between the mold cavity and the external environment. It provides venting ducts that channel gas away from the product surface through controlled pathways, allowing gas to escape via the outer surface of the sealing element rather than directly onto the product, thus maintaining surface quality while achieving effective venting.
Solution Approach 2:
The venting ducts in the sealing element can be designed as simple, easily replaceable features. If material accumulates in the venting ducts, the entire sealing element can be quickly removed and replaced, minimizing downtime. This approach is more efficient than trying to clean complex mold venting channels while maintaining product surface quality.
3Quantity of substance
If the sealing element provides complete sealing, then material containment is improved, but gas evacuation deteriorates
Solution Approach 1:
The sealing element incorporates dynamic control of sealing and venting functions through its design: during injection, the venting ducts are open to allow gas escape; as injection progresses and gas is evacuated, the sealing elements maintain containment of molding material. The system dynamically transitions between venting and sealing modes based on the injection process stage, ensuring both material containment and gas evacuation.
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
Ensures high-quality, smooth product surfaces by effectively removing gas and bubbles during the injection molding process, preventing venting marks and allowing for efficient material removal from the venting ducts, thereby enhancing the molding process.
Implementation Method 1
the bubbled surface of semi-liquid molding material is able to leave the mold through the at least one venting duct of the sealing element
Implementation Method 2
provide sufficient elasticity and resiliency to seal products having varying outer contours
Implementation Method 3
provide sufficient elasticity and resiliency to seal products having varying outer contours
Implementation Method 4
Such sealing elements can be produced in an efficient manner, may have a closed cell structure and provide sufficient elasticity and resiliency
Data Source
Figure 1A~3
AI summary
A sealing element for a molding machine comprises a base body with an inner receptacle wherein the base body is provided with a venting duct to connect an inner receptacle of the sealing element with an outer surface thereof.