Side Gate Nozzle Mold Layout for Precise Melt and Cavity Cooling
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Solution Overview
Problem
Existing injection molds for plastics face challenges in achieving precise temperature control of molten plastic and efficient cooling of cavity halves, which affects the quality and cycle time of produced plastic parts.
Innovation Solution
The injection mold design incorporates a mold insert frame with distributed openings for mold inserts, a nozzle head with primary and secondary melt channels, and independent cooling channels that surround the cavities and are in fluid communication with separate cooling circuits, allowing for efficient temperature control and cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional side gate nozzle with nozzle head and nozzle tips is used, then the plastic material can be injected into the cavities, but the temperature control precision and cooling efficiency of the cavity halves are insufficient, affecting quality and cycle time
Solution Approach 1:
The mold is divided into separate components: a mold insert frame with multiple openings, individual mold inserts encompassing cavity halves, and a centralized nozzle head. This segmentation allows independent temperature control of each cavity half while maintaining overall system simplicity through modular design.
Solution Approach 2:
The mold insert frame acts as an intermediary structure that houses the nozzle head in its center opening and accommodates multiple mold inserts in distributed openings. This intermediary framework enables efficient heat distribution and cooling channel integration without requiring complex direct connections between the nozzle and each cavity.
2Productivity
If independent cooling channels are implemented for each cavity, then cooling efficiency improves, but the device complexity increases
Solution Approach 1:
The cooling system is segmented into independent cooling channels, each surrounding a specific cavity half and connected to cooling circuits. This allows each cavity to be cooled independently and efficiently, reducing cycle time while maintaining manageable complexity through the modular mold insert structure.
Solution Approach 2:
The cooling channels are nested within the mold insert frame structure, with each cooling channel surrounding its corresponding cavity half. This nested arrangement integrates the cooling system into the existing mold structure without requiring separate external cooling units, thereby improving cooling efficiency while controlling overall system complexity.
3Reliability
If the nozzle head is kept at high temperature above melting point, then the plastic material flows smoothly, but the energy consumption increases
Solution Approach 1:
The nozzle head is maintained at high temperature only in the specific regions where plastic material flows (melt channels and nozzle tips), while other parts of the mold structure are kept at lower temperatures. This localized heating approach ensures reliable material flow stability while minimizing overall energy consumption by avoiding unnecessary heating of entire mold components.
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 design enables precise temperature control of the molten plastic and efficient cooling of the cavity halves, resulting in high-quality plastic parts with short cycle times.
Implementation Method 1
A first cooling channel surrounds the cavity and is in fluid communication with a first cooling circuit across the mold insert frame
Implementation Method 2
While the nozzle head and the thereto interconnected nozzle tips are kept on a temperature above the melting temperature of the plastic material
Data Source
AI summary
An injection mold includes a mold insert frame having several openings extending in an axial direction (z). Each opening accommodates a mold insert encompassing a cavity, suitable to receive during operation melted plastic to form a plastic part. The several openings with the mold inserts are distributed around a center opening of the mold insert frame. A nozzle head is arranged in the center opening of the mold insert frame. A primary melt channel, extending in the axial direction (z), and per cavity a secondary melt channel are each interconnected at a dorsal end to the primary melt channel and at a distal end to a cavity by a nozzle tip attached to the nozzle head. Each mold insert includes a first cooling channel surrounding the cavity and being in fluid communication with a first cooling circuit across the mold insert frame.