Paperboard Container Weld Seal for Sift-Proof Sealing

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing packaging containers for dry flowable pulverulent consumer goods face challenges in maintaining the freshness and hygiene of contents after the inner barrier membrane is removed, as they are not sufficiently sift-proof and can be contaminated, leading to issues with flavor, scent, and vitamin retention.

Innovation Solution

A method of producing paperboard packaging containers involves forming a tubular container body, attaching a reinforcing rim to the inner surface via welding, and applying a sealing membrane before filling with pulverulent material to ensure a tight and hygienic seal, which is sift-proof and gas-tight, maintaining the container's barrier properties even after the inner membrane is removed.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a sealing membrane is applied to close the upper body opening, then the container maintains freshness and protection against contamination, but the container cannot be repeatedly opened and re-sealed

Engineering Contradiction:

Improveprotection against contaminationVSAvoidrepeated opening and re-sealing capability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The sealing system is divided into two independent parts: a removable sealing membrane for initial protection and a reusable lid with integrating rim for repeated sealing. The sealing membrane can be removed to access contents while the lid remains attached to the container body, enabling subsequent opening/closing cycles without compromising the sealing function.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The integrating rim acts as an intermediary component that connects the lid to the container body, providing a mechanical interface for repeated sealing. This rim structure mediates between the removable sealing membrane and the lid, allowing the lid to form a gas-tight seal independently after the membrane is removed.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If the container is designed for repeated opening and closing, then adaptability is improved, but the ability to maintain freshness and protection is compromised

Engineering Contradiction:

Improverepeated opening and closing capabilityVSAvoidfreshness and protection maintenance

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The lid assembly combines multiple materials with complementary properties: the lid body provides structural integrity, the integrating rim provides mechanical connection and sealing surface, and the sealing membrane provides initial gas-tight barrier. This composite structure enables both repeated opening/closing and maintained freshness protection.

Inventive Principle:

Principle #40Composite materials

3Reliability

If an inner removable barrier membrane is used, then initial protection is improved, but the container lacks sufficient sift-proof capability after membrane removal

Engineering Contradiction:

Improveinitial protection capabilityVSAvoidcontamination and sift-proof deficiency

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The sealing membrane is extracted as a separate, removable component rather than being integrated into the lid structure. This allows the membrane to be removed completely after initial use, while the lid with integrating rim remains as a permanent fixture providing ongoing sift-proof protection independent of the membrane.

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

The method provides a reliable, sift-proof, and gas-tight seal that maintains the quality and hygiene of the contents, preventing contamination and ensuring the retention of flavor, scent, and vitamin content, even after repeated openings and closings.

Implementation Method 1

forming a weld seal between the inner surface of the container wall and the inserted part of the upper reinforcing rim

Methodology Applied

Scientific EffectWelding: Welding

Data Source

PatentUS10787280B2Method of producing and filling a packaging container

Publication Date: 2020.09.29 GPI SYST AB

AI summary

A method of producing and filling a paperboard packaging container with pulverulent bulk solids includes forming a tubular container body from a paperboard sheet, the body having upper and lower body openings and a container wall extending between the upper and lower body openings and having inner and outer surfaces; closing the upper body opening with a sealing membrane attached to the inner surface; providing an upper reinforcing rim; inserting at least a lower part of the upper reinforcing rim into the tubular container body at the upper body opening; forming a weld seal between the inner surface and the inserted part of the upper reinforcing rim; presenting the body to a filling station with the bottom body opening of the container body directed upward in a vertical direction; filling pulverulent material into the body through the upwardly directed bottom body opening; and closing the bottom body opening.