Two-Layer Preform Mold Protrusion for Delamination
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Solution Overview
Problem
Current production methods for delamination containers with a two-layer structure struggle to efficiently produce these containers using a single hot parison type blow-molding apparatus, due to issues like unbonding of preforms during blow-molding, easy detachment of inner and outer layers, and difficulty in forming vent holes for peeling.
Innovation Solution
A production apparatus and method that involves injection-molding a two-layer preform with an inner layer preform and an outer layer preform, where the outer layer cavity mold has a protrusion to separate the inner layer preform, and a neck mold that changes shape to accommodate different preform layers, enabling the formation of a through-hole for ventilation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a hot parison type blow-molding apparatus is used to produce two-layer delamination containers, then productivity improves and waste reduces, but the inner layer preform and outer layer preform easily unbond during blow-molding
Solution Approach 1:
The patent applies preliminary action by pre-heating the inner layer preform before injection-molding the outer layer preform. This ensures the inner layer is at an optimal temperature for bonding when the outer layer is molded around it, preventing unbonding during subsequent blow-molding operations while enabling single-apparatus production
Solution Approach 2:
The patent changes physical parameters by controlling the temperature of the inner layer preform and the injection-molding parameters of the outer layer. By adjusting these parameters, the bonding between layers is optimized to prevent separation during blow-molding while maintaining high productivity
2Ease of manufacture
If extrusion blow-molding method is used to produce delamination containers, then ease of manufacture improves, but dimensional accuracy and appearance quality deteriorate
Solution Approach 1:
The patent merges the injection-molding and blow-molding processes into a single integrated apparatus. The injection-molding step forms the preform with high dimensional accuracy, and the subsequent blow-molding step completes the container formation, combining the advantages of both methods while maintaining manufacturing simplicity
3Productivity
If a single hot parison type blow-molding apparatus is used for two-layer preform production, then productivity improves, but it becomes difficult to form vent holes for peeling
Solution Approach 1:
The patent applies preliminary action by forming vent holes in the outer layer preform during the injection-molding stage, before blow-molding occurs. This preliminary formation of vent holes enables easy peeling of the inner layer from the outer layer after use, while maintaining the benefits of single-apparatus production
4Adaptability or versatility
If neck mold shape is changed to accommodate different preform layers, then adaptability improves, but device complexity increases
Solution Approach 1:
The patent applies dynamics by making the neck mold shape changeable or adjustable to accommodate different preform configurations. This dynamic capability allows the same mold to handle both inner and outer layer preforms, providing adaptability while managing complexity through a single versatile component rather than multiple fixed molds
Data Source
AI summary
A production apparatus of a two-layer preform including an inner layer preform and an outer layer preform includes: an outer layer cavity mold for injection-molding the outer layer preform. A bottom surface of the outer layer cavity mold is provided with a protrusion for separating the inner layer preform disposed in the outer layer cavity mold from the bottom surface.