PET Preform Injection Nozzle for Cold-Runner Wall Coating

Solution Overview

Problem

Existing pet preform production methods face inefficiencies in plastering molten material onto cavity walls, leading to production losses, high energy consumption, and equipment costs due to hydraulic systems and hot runner blockages.

Innovation Solution

A pet preform injection system with a nozzle that coats molten material onto cavity walls via a slot, utilizing rotational and linear movements to enhance adhesion and heat transfer, and a core that forms the inner geometry of the preform.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If injection molding method is used with high pressure and temperature, then molten material can be injected into mold, but tension and expansion on metal parts increases and hot runner blockage occurs

Engineering Contradiction:

Improvemolten material injectionVSAvoidhot runner blockage

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The patent extracts and removes the hot runner system from the injection molding process. Instead of using a hot runner that is prone to blockage, the system directly injects molten material through a cold runner into the mold cavity, eliminating the blockage-prone hot runner component entirely

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent employs a cold runner system that can be easily replaced or discarded after use. Rather than maintaining and repairing expensive hot runner systems with complex valve gates, the cold runner acts as a disposable or easily replaceable component, reducing long-term costs and downtime

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Force

If hydraulic system is used for mold locking, then high locking force is achieved, but energy consumption increases and machine cost rises

Engineering Contradiction:

Improvemold locking forceVSAvoidenergy consumption

Core Design Contradiction:

ForceVSUse of energy by moving object

Solution Approach 1:

The patent replaces the hydraulic locking system with a purely mechanical locking mechanism. The mold locking force is achieved through mechanical elements such as locking arms or lugs that engage with corresponding features on the mold halves, eliminating the need for hydraulic pumps and fluid systems

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The mechanical locking system is designed to be self-contained and self-regulating. The locking force is generated and maintained through the inherent mechanical geometry and spring-loaded elements, without requiring external hydraulic power sources or complex control systems

Inventive Principle:

Principle #25Self-service

3Productivity

If conventional injection molding is used, then production can be maintained, but production downtime occurs due to hot runner repairs

Engineering Contradiction:

Improveproduction continuityVSAvoidrepair time

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The patent extracts and removes the hot runner system from the injection molding process. Instead of using a hot runner that is prone to blockage, the system directly injects molten material through a cold runner into the mold cavity, eliminating the blockage-prone hot runner component entirely

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent employs a cold runner system that can be easily replaced or discarded after use. Rather than maintaining and repairing expensive hot runner systems with complex valve gates, the cold runner acts as a disposable or easily replaceable component, reducing long-term costs and downtime

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

4Ease of operation

If valve gate needles run on compressed air, then flow control is achieved, but compressor connection is required and system complexity increases

Engineering Contradiction:

Improveflow controlVSAvoidcompressor connection

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent extracts and removes the valve gate needle system from the mold. Instead of using compressed air-operated valve gates to control material flow, the system uses a straightforward cold runner design where material flow is controlled by the injection process itself, eliminating the need for pneumatic components and compressor connections

Inventive Principle:

Principle #2Taking out (Extraction)

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

Improves productivity by ensuring effective plastering of molten material onto cavity walls, reduces energy consumption, and minimizes production downtime.

Implementation Method 1

the cavity (30) which rotates rapidly around the y axis ad adheres the molten material (e) to its surfaces

Methodology Applied

Scientific EffectCentrifugal force: Centrifugal Force

Implementation Method 2

the molten material (e) moves towards the claw (70) by being casted onto the walls of the cavity (30)

Methodology Applied

Scientific EffectHeat transfer: Conduction (thermal)

Data Source

PatentUS12502812B2Pet preform injection system and production method

Publication Date: 2025.12.23 FR MAKINA VE MUHENDISLIK ANONIM SIRKETI

AI summary

The invention is related to the production of pet preform and similar plastic products, as well as similar-shaped metallic pieces manufactured by plastic injection.