Stretch Blow Molding Eccentric Resin Container

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Solution Overview

Problem

Existing stretch blow molding methods are limited in manufacturing containers with large eccentricities, and extrusion blow molding methods result in inferior aesthetic appearance and dimensional accuracy, with significant resin waste and post-processing requirements.

Innovation Solution

A resin-made container manufacturing method using a stretch blow molding process with a clamping mechanism that bends and stretches a preform to position a bulge portion outside the neck portion's projection region, allowing for a large eccentricity, and a manufacturing apparatus with a clamping mechanism and moving mechanism to facilitate this process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If extrusion blow molding method is used to manufacture containers with large eccentricity, then large eccentricity can be achieved, but aesthetic appearance and dimensional accuracy deteriorate

Engineering Contradiction:

Improvedimensional accuracyVSAvoideccentricity capability

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The patent applies the dynamics principle by making the stretching rod movable and adjustable in position and angle. The stretching rod can be moved to different locations and adjusted to various angles during the blow molding process, enabling the manufacture of containers with large eccentricity while maintaining dimensional accuracy and aesthetic appearance through the stretch blow molding method.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If extrusion blow molding method is used, then large eccentricity can be achieved, but resin waste increases

Engineering Contradiction:

Improveeccentricity capabilityVSAvoidresin waste

Core Design Contradiction:

Adaptability or versatilityVSLoss of substance

Solution Approach 1:

The movable and adjustable stretching rod enables precise control of the molding process, allowing the use of stretch blow molding method to manufacture containers with large eccentricity. This eliminates the need for extrusion blow molding, thereby preventing resin waste and post-processing requirements while achieving the desired eccentricity.

Inventive Principle:

Principle #15Dynamics

3Manufacturing precision

If stretch blow molding method is used with conventional fixed stretching rod, then aesthetic appearance and dimensional accuracy are maintained, but large eccentricity cannot be achieved

Engineering Contradiction:

Improvedimensional accuracyVSAvoideccentricity capability

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The patent transforms the conventional fixed stretching rod into a movable and adjustable component. The stretching rod can be positioned at different locations and adjusted to various angles, enabling the stretch blow molding method to produce containers with large eccentricity while preserving aesthetic appearance and dimensional accuracy.

Inventive Principle:

Principle #15Dynamics

4Adaptability or versatility

If extrusion blow molding method is used, then large eccentricity can be achieved, but post-processing requirements increase

Engineering Contradiction:

Improveeccentricity capabilityVSAvoidpost-processing needs

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The adjustable stretching rod enables precise control during the blow molding process, allowing the stretch blow molding method to manufacture containers with large eccentricity in a single step. This eliminates the need for post-processing operations such as cutting burrs and trimming cut surfaces that are required when using extrusion blow molding.

Inventive Principle:

Principle #15Dynamics

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 and apparatus enable the production of resin-made containers with large eccentricities, improving aesthetic appearance and dimensional accuracy while reducing resin waste and post-processing needs.

Implementation Method 1

a stretch mechanism configured to stretch the preform by a pressurizing medium after the split molds are closed

Methodology Applied

Scientific EffectPressure: Pressure Increase

Data Source

PatentEP3900912B1Resin-made container, resin-made container manufacturing method, resin-made container manufacturing apparatus, and metal mold

Publication Date: 2026.01.28 NISSEI ASB MASCH CO LTD

Figure 1A
Figure 1B
Figure 1C

AI summary

This resin-made container (10) is provided with: a neck portion (12) having a content inlet-outlet portion (11); a lateral surface portion connected to the neck portion (12); and a bottom portion (14) that is disposed on the side opposite to the neck portion (12) and that is connected to the lateral surface portion. The resin-made container (10) is produced by a stretch blow molding process. The bottom portion (14) has formed therein a bulge section (25) that protrudes downward in the vertical direction. The bulge section 25 is disposed in an eccentric region (S2), of the bottom portion (14), positioned outside a region (S1) demarcated by perpendicularly projecting an opening plane of the inlet-outlet portion (11) of the neck portion (12).