Stripper Sleeve for Closure Stripping

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Solution Overview

Problem

Existing molding systems face challenges in efficiently stripping closures from the molding stack without causing damage, particularly due to over-stretching of the tamper evident band during the stripping process.

Innovation Solution

A stripper sleeve with a pocket defined by a first axial wall and a second traverse wall, configured to simultaneously contact the side and underside of the closure, allowing controlled deflection and preventing over-deflection, is introduced to assist in the stripping process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If conventional stripping methods are used, then the closure can be removed from the mold, but the tamper evident band becomes over-stretched and damaged

Engineering Contradiction:

Improvestripping processVSAvoidtamper evident band

Core Design Contradiction:

Ease of operationVSStrength

Solution Approach 1:

A stripper sleeve is introduced as an intermediary component between the closure and the stripping mechanism. The sleeve has a pocket that receives the bottom of the closure and provides a controlled interface for applying stripping forces, preventing direct contact that causes over-stretching of the tamper evident band.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The stripping process parameters are changed by controlling the movement and contact points through the stripper sleeve. The sleeve allows controlled deflection of the closure during stripping, changing the force distribution parameters to prevent over-stretching while maintaining effective removal.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If the stripper applies strong forces to remove the closure, then stripping efficiency increases, but the tamper evident band is more likely to be damaged

Engineering Contradiction:

Improvestripping speedVSAvoiddamage to closure

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The stripper sleeve acts as a mediator that distributes stripping forces evenly across the closure body rather than concentrating forces on the tamper evident band. This allows efficient stripping while protecting the closure from damage.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The pocket structure of the stripper sleeve is designed to cushion and control the forces applied during stripping before they reach the closure. This pre-control of force application prevents harmful effects while maintaining productivity.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Data Source

PatentEP2750855B1A stripper sleeve

Publication Date: 2017.06.14 HUSKY INJECTION MOLDING SYST LTD

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AI summary

There is provided a molding stack (102). The molding stack (102) comprises a stripper sleeve (122) that is movable to contact a molded article (114) after the molding thereof; the stripper sleeve (122) having a first surface (204) and a second surface (206) for simultaneously contacting a side and an underside surface, respectively, of the molded article (114) during the stripping of the molded article (114).