Peelable Container Neck Structure for Short-Cycle Layer Separation

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Solution Overview

Problem

Existing methods for manufacturing delamination containers face challenges in achieving a short manufacturing cycle while facilitating the separation of inner and outer layers, particularly due to reduced stretching of the bottom portion, leading to difficulty in pulling out the inner layer from the outer layer for reuse.

Innovation Solution

A delamination container design with a neck portion and a bottomed cylindrical body, featuring a first region injection-molded in close contact with the outer layer, a second region protruding from the neck, and a protruding body that peels off the inner and outer layers when pushed, allowing for easy separation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the inner layer and outer layer are integrally stretched during blow molding, then the manufacturing cycle is shortened and productivity is improved, but the stretching amount of the bottom portion is reduced causing the inner layer container to become thick and difficult to pull out for reuse

Engineering Contradiction:

Improvemanufacturing cycleVSAvoidseparation of inner layer from outer layer

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

The invention divides the neck portion into distinct regions: a first region that contacts the outer layer and a second region that protrudes outward. This segmentation allows the inner layer to be pulled out from the outer layer through the protruding second region, enabling easy separation for reuse while maintaining integrated manufacturing benefits

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention introduces a radial dimension by forming a protruding body on the outer periphery of the second region. This protruding body creates a dimensional feature that facilitates peeling and separation of the inner layer from the outer layer, solving the reuse problem while preserving the integrated stretch blow molding process

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If the bottom portion stretching amount is suppressed to maintain vent functionality, then the vent structure is preserved, but the inner layer container thickness increases making separation difficult

Engineering Contradiction:

Improvevent functionalityVSAvoidpulling out inner layer for reuse

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The neck portion is segmented into functional regions, with the second region providing a protruding structure that enables easy separation. This segmentation allows the bottom portion to maintain its vent functionality while the neck region provides a separate mechanism for easy inner layer removal

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The protruding body acts as an intermediary structure between the inner and outer layers. It provides a peeling surface that facilitates separation without requiring excessive stretching of the bottom portion, thus maintaining vent functionality while enabling easy reuse

Inventive Principle:

Principle #24Intermediary (Mediator)

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 mass production of delamination containers in a short cycle with facilitated separation of inner and outer layers, ensuring easy reuse and maintaining a ventilation passage for air introduction.

Implementation Method 1

a first region that is injection-molded in close contact with an inner periphery of the neck portion of the outer layer

Methodology Applied

Scientific EffectInjection molding:

Implementation Method 2

a second region that is formed on one side of the first region and is injection-molded in a state of protruding from the neck portion of the outer layer

Methodology Applied

Scientific EffectInjection molding:

Implementation Method 3

a protruding body that is formed on an outer periphery of the second region and peels off the inner layer and the outer layer from each other from one side of the neck portion when the second region is pushed to the other side toward the neck portion of the outer layer

Methodology Applied

Scientific EffectMechanical force: Mechanical Force

Implementation Method 4

the preform is blow-molded to form the vent in a bottom portion of the delamination container

Methodology Applied

Scientific EffectBlow molding:

Data Source

PatentEP4617028A1Peelable container, preform, and manufacturing method and manufacturing device for peelable container

Publication Date: 2025.09.17 NISSEI ASB MASCH CO LTD

Figure 1
Figure 2(a)~2(b)
Figure 3

AI summary

A delamination container includes a neck portion opened on one side and a bottomed cylindrical body portion connected to the neck portion, in which an inner layer is laminated on an inner side of an outer layer. The neck portion of the inner layer includes: a first region that is injection-molded in close contact with an inner periphery of the neck portion of the outer layer; a second region that is formed on one side of the first region and is injection-molded in a state of protruding from the neck portion of the outer layer; and a protruding body that is formed on an outer periphery of the second region and peels off the inner layer and the outer layer from each other from one side of the neck portion when the second region is pushed to the other side toward the neck portion of the outer layer.