Inclined Hot-Runner Nozzle Layout for Leak-Stable Resin Molding
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Solution Overview
Problem
In existing blow molding machines, the arrangement of injection devices relative to the hot runner mold leads to resin leakage and uneven thickness of preforms due to difficulties in aligning the nozzle and sprue, especially when the devices are inclined, increasing the installation area and making it difficult to adjust nozzle touch force.
Innovation Solution
A hot runner mold design that includes a hot runner mold body, a nozzle receiving portion inclined relative to the resin inlet, a relay portion with a bent resin flow path, and a regulating portion to stabilize the nozzle connection, allowing for parallel alignment of injection devices and reducing resin leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the injection device is arranged orthogonal to the front of the hot runner mold to align the nozzle and sprue, then resin leakage is suppressed, but the installation area of the molding machine increases
Solution Approach 1:
The sprue is arranged at an inclined position relative to the resin inlet rather than orthogonal alignment. This asymmetric configuration allows the injection device to be positioned in a way that reduces the overall installation area while maintaining effective nozzle-sprue contact to prevent resin leakage
Solution Approach 2:
The sprue is positioned in an inclined state, utilizing angular orientation rather than straight orthogonal alignment. This dimensional change in arrangement allows for a more compact footprint of the molding machine while preserving the functional alignment needed to prevent resin leakage
2Area of stationary object
If the injection device is arranged in parallel while being inclined with respect to the front of the hot runner mold to reduce installation area, then the machine size is reduced, but it becomes difficult to adjust relative positions of members and optimize the nozzle touch force
Solution Approach 1:
The injection device is designed with movable components that allow dynamic adjustment of its position and orientation. This enables the operator to optimize the nozzle touch force and relative positioning despite the inclined parallel arrangement, maintaining ease of operation while preserving a compact machine footprint
3Reliability
If the nozzle touch force is increased to suppress resin leakage in inclined arrangement, then resin leakage is reduced, but the hot runner mold and injection cavity mold are pushed causing inclination or misalignment with respect to the lower base
Solution Approach 1:
The inclined sprue configuration provides localized geometric features that distribute and redirect the forces generated during injection. This local geometric optimization allows for adequate nozzle touch force to prevent resin leakage while minimizing the transmission of pushing forces to the molds, thereby maintaining alignment with the lower base
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 design effectively reduces resin leakage and maintains proper alignment, minimizing uneven thickness and reducing the overall machine size while maintaining efficient production of delamination containers.
Implementation Method 1
a relay portion (63) that has a resin flow path having a bent portion therein and guides the molten resin from the nozzle receiving portion to the resin inlet
Implementation Method 2
the hot runner mold is heated to a high temperature equal to or higher than the melting point of the resin material so that the resin material flowing therein is not solidified
Data Source
AI summary
A hot runner mold includes a hot runner mold body portion that is fixed to a fixing plate and supplies a molten resin received from a resin inlet to an injection mold, a nozzle receiving portion that is disposed to be inclined with respect to a position orthogonal to the resin inlet of the hot runner mold body portion and is coaxially connected to a nozzle of an injection device that supplies the molten resin, a relay portion that has a resin flow path having a bent portion therein and guides the molten resin from the nozzle receiving portion to the resin inlet, and a regulating portion that is fixed to the fixing plate and regulates movement of the nozzle receiving portion or the relay portion with respect to the hot runner mold body portion.