PET Film Reuse Pellets for Injection Blow Molding

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Solution Overview

Problem

Existing methods for reusing PET films with ceramics stuck to their surface are limited in their applicability and efficiency, particularly in forming resin molded articles through injection blow molding due to rapid PET solidification and high manufacturing costs.

Innovation Solution

A method involving repelletizing used PET film with ceramics stuck to its surface, mixing it with pellets containing a lower percentage of non-PET components, and forming resin molded articles through injection blow molding to slow PET solidification and reduce costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If used PET film with ceramic is repelletized and used for injection blow molding, then resource reuse is improved, but PET solidification occurs too rapidly causing molding failure

Engineering Contradiction:

Improveapplicability to injection blow moldingVSAvoidPET solidification time

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

A nucleating agent is introduced as an intermediary substance to mediate between the PET resin and the molding process. The nucleating agent modifies the crystallization behavior of PET, slowing down the solidification rate to match the requirements of injection blow molding while maintaining resource reuse benefits

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The crystallization parameters of PET are changed by adding a nucleating agent, which alters the solidification kinetics. This parameter change enables the PET to maintain moldability for the required duration of injection blow molding without compromising the reuse of used PET film with ceramic

Inventive Principle:

Principle #35Parameter changes

2Reliability

If used PET film with ceramic is cleaned to remove deposited substances, then reuse quality is improved, but manufacturing cost increases

Engineering Contradiction:

Improvereuse qualityVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The harmful ceramic deposits are selectively extracted and removed from the used PET film surface through a targeted cleaning process. This extraction approach removes only the problematic substances while preserving the base PET material, thereby maintaining reuse quality without requiring complete film replacement or excessive cleaning that would increase costs

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The cleaning process selectively discards the ceramic deposits while recovering and reusing the cleaned PET film. This approach separates the valuable reusable component (PET film) from the waste component (ceramic deposit), enabling cost-effective reuse of the film while properly disposing of the contaminating substances

Inventive Principle:

Principle #34Discarding and recovering

Data Source

PatentUS20260054422A1Reuse method of used pet film, pellet, and resin molded article

Publication Date: 2026.02.26 KYOCERA DOCUMENT SOLUTIONS INC

AI summary

A reuse method of a used PET film, with a ceramic stuck to a surface thereof, is provided. The reuse method of the used PET film includes a repelletizing process, a pellet mixing process, and a molding process. The repelletizing process includes producing a first pellet by repelletizing the used PET film. The pellet mixing process includes mixing the first pellet produced through the repelletizing process, with a second pellet containing a lower percentage of components other than PET than the first pellet. The molding process includes forming a resin molded article through an injection blow molding process, from the first pellet and the second pellet, mixed together in the pellet mixing process.