ISBM Plunger Bending Parison Handle for Two-Point Integration

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Solution Overview

Problem

Injection stretch blow molding (ISBM) processes face difficulties in forming integral handles connected to bottles at two points, as existing methods either lack strength in separately formed handles or interfere with the stretch blow tooling and process.

Innovation Solution

The development of stretch blow station tooling with shiftable blow mold halves and a plunger assembly that contacts and bends the handle of the parison within the blow cavity, allowing for secure integration of the handle to the molded article at two connection points during the stretch blow process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If separately formed handles are connected to the parison body, then the handle can be formed independently, but the connection points lack inherent strength

Engineering Contradiction:

Improvehandle formationVSAvoidconnection point strength

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The patent merges the handle and parison body into a single integrally-formed component through injection molding. The mold includes a handle cavity and parison cavity that are formed as one unified structure, eliminating separate connection points and ensuring inherent strength throughout the entire handle-parison assembly.

Inventive Principle:

Principle #5Merging (Combining)

2Strength

If an integral handle is injection molded into the parison, then the handle and body are formed as one piece, but it is difficult to satisfactorily stretch blow the parison into a container

Engineering Contradiction:

Improvehandle integrationVSAvoidstretch blow molding

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The patent performs preliminary actions by forming notches in the handle during injection molding before the stretch blow molding process. These notches are strategically positioned to facilitate the subsequent stretch blow operation, allowing the parison to be successfully blown into the final container shape while maintaining the integral handle structure.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent segments the handle into specific regions including notches and connection points during the injection molding process. This segmentation allows the handle to be formed with predetermined structural features that enable successful stretch blow molding while maintaining integral strength.

Inventive Principle:

Principle #1Segmentation

3Shape

If the parison is stretch blown into a container, then the final container shape is achieved, but the handle interferes with and obstructs the stretch blow tooling and process

Engineering Contradiction:

Improvecontainer shapeVSAvoidstretch blow tooling

Core Design Contradiction:

ShapeVSDevice complexity

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

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

Enables the production of molded articles with integral handles securely attached at two points, enhancing handling and transportation capabilities while maintaining the structural integrity of the container.

Implementation Method 1

a plunger assembly including a plunger configured to be selectively positioned within the blow cavity. When the plunger is selectively positioned within the blow cavity, the plunger is configured to contact the handle of the parison

Methodology Applied

Scientific EffectMechanical Force: Mechanical Force

Data Source

PatentUS10189200B2Tooling, system, and process for injection stretch blow molded container with integral handle

Publication Date: 2019.01.29 R & D TOOL AND ENGINEERING INC

AI summary

Stretch blow station tooling for stretch blowing at least one parison into a molded article, with such parison including a handle. The tooling comprises at least one blow mold assembly including first and second blow mold halves shiftable between an open position and a closed position. The first and second blow mold halves each include a body cavity surface formed therein. In the closed position, the body cavity surfaces of the first and second blow mold halves are aligned to define a blow cavity for receiving at least a portion of the parison. The tooling further comprises a plunger assembly including a plunger configured to be selectively positioned within the blow cavity. When the plunger is positioned within the blow cavity, the plunger is configured to contact the handle of the parison.