Injection Stretch Blow Molded Container With Integral Handle

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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 or interfere with the stretch blow process, making it challenging to produce containers with securely attached handles.

Innovation Solution

The development of injection station tooling with a cavity block, body mold, handle mold, and thread split assembly, along with a conditioning station using a dowel to reshape the handle, and a stretch blow station with blow mold assemblies, allows for the formation of parisons with integral handles that are securely attached to the container at two points during the stretch blowing process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a parison is injection molded with an integral handle connected at two points, then the handle strength and connection reliability are improved, but the stretch blow molding process is interfered with and cannot be satisfactorily completed

Engineering Contradiction:

Improvehandle connection reliabilityVSAvoidstretch blow molding processability

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The tooling is divided into separate body mold and handle mold components that can be independently positioned and controlled. The handle mold includes first and second handle mold halves that can be selectively opened and closed, allowing the handle to be formed and then released from the mold during the stretch blow process, preventing interference while maintaining integral formation

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The handle mold halves are made movable rather than fixed, allowing them to open during the stretch blow molding process. This dynamic configuration enables the handle to be formed integrally with the parison initially, then released to allow the stretch blow process to proceed without obstruction, resolving the contradiction between handle strength and processability

Inventive Principle:

Principle #15Dynamics

2Ease of manufacture

If the handle is formed separately and connected to the parison body, then the stretch blow molding process is simplified, but the connection points lack inherent strength

Engineering Contradiction:

Improvestretch blow molding processabilityVSAvoidhandle connection strength

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The handle and parison body are merged into a single integral structure through simultaneous injection molding. The resin is injected to form both the body and handle as one unified piece, ensuring inherent strength at the connection points where the handle attaches to the body, while the movable handle mold allows the process to remain feasible

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If the handle interferes with the stretch blow process, then two-point connection may be achieved, but the stretching capabilities of the parison body are obstructed

Engineering Contradiction:

Improvehandle attachment securityVSAvoidstretch blow molding efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The handle mold halves transition from a closed position during injection molding to an open position during stretch blow molding. This dynamic movement allows the handle to be formed integrally with secure attachment points, then released to eliminate interference with the stretching process, maintaining both handle security and production efficiency

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

This solution enables the production of containers with integral handles that are securely attached at two points, enhancing handling and transportation capabilities while maintaining the integrity of the stretch blow molding process.

Implementation Method 1

injection molds a resin into one or more parisons of desired shape

Methodology Applied

Scientific EffectInjection molding:

Implementation Method 2

conditions the parisons in preparation for stretch blow molding (e.g., applying heat to the parison)

Methodology Applied

Scientific EffectHeating: Heating

Implementation Method 3

stretch blow molds the parisons into final molded articles

Methodology Applied

Scientific EffectStretch blow molding:

Implementation Method 4

The dowel is configured to rotate, such that with the portion of the handle received within the dowel, the dowel is operable to reshape at least a portion of the handle

Methodology Applied

Scientific EffectMechanical deformation: Deformation

Data Source

PatentUS9962881B2Tooling and process for injection stretch blow molded container with integral handle

Publication Date: 2018.05.08 R & D TOOL AND ENGINEERING INC

AI summary

Injection stretch blow molding tooling for forming at least one parison and at least one stretch blown article having an integral handle. The tooling includes at least one cavity block, a body mold supported within the cavity block, a handle mold supported within the cavity block, and a thread split assembly positioned adjacent to said cavity block. The thread split assembly includes first and second thread split halves shiftable between an open position and a closed position. As such, the body mold, the handle mold, and the thread split assembly cooperatively define a parison-forming cavity, with such parison-forming cavity including a body cavity for forming a body of the parison and a handle cavity for forming a handle of the parison.