Paper Container Seam Structure for Cut-Edge Leak Prevention

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Solution Overview

Problem

Paper containers face challenges with liquid leakage through cut edges due to difficulties in applying a lamination layer, especially with colored or highly permeable liquids, affecting usability.

Innovation Solution

The anti-leakage paper container design includes a container wall composed of connecting cardboard with a first and second side forming a cylinder, equipped with a lamination layer on inner and outer surfaces, and a film wrapping edge wrapping the cut edge to prevent leakage, using materials like composite barrier film and mixed films of LLDPE and LDPE for enhanced protection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a lamination layer is applied to the inner and outer surfaces of the paper container, then liquid leakage through the substrate is prevented, but the cut edges of the substrate remain exposed and vulnerable to leakage

Engineering Contradiction:

Improveanti-leakage performanceVSAvoidedge leakage

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

A film wrapping edge is introduced to wrap around the cut edges of the connecting cardboard, forming a flexible barrier that prevents liquid from penetrating through the edges. This thin film structure complements the rigid lamination layer by protecting the vulnerable edge regions where the lamination cannot be applied.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The anti-leakage protection is divided into two segments: the lamination layer covering the inner and outer surfaces of the container, and the film wrapping edge specifically protecting the cut edges. This segmentation allows each component to address its specific functional requirement independently.

Inventive Principle:

Principle #1Segmentation

2Ease of manufacture

If the first side and second side of the connecting cardboard are lapped to form a cylinder, then the container structure is formed, but the overlapping region creates potential leakage paths

Engineering Contradiction:

Improvecylinder formationVSAvoidseam leakage resistance

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The film wrapping edge extends into the overlapping region between the first and second sides of the connecting cardboard, creating a continuous flexible barrier that seals the seam area. This ensures that the lapped joint does not create leakage paths while maintaining the cylindrical structure.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The film wrapping edge is nested within the overlapping region of the lapped sides, with the film positioned inside the fold to create a sealed pocket that prevents liquid from penetrating through the seam between the first and second sides.

Inventive Principle:

Principle #7Nested doll (Nesting)

3Reliability

If the film wrapping edge wrapping depth is increased to ensure edge coverage, then cut edge protection is improved, but the container structure complexity increases

Engineering Contradiction:

Improvecut edge sealingVSAvoidwrapping structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The wrapping depth of the film wrapping edge is optimized to a specific parameter range (10-15 mm) that provides sufficient coverage of the cut edges and overlapping region without excessive complexity. This parameter optimization balances protection effectiveness with structural simplicity.

Inventive Principle:

Principle #35Parameter changes

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 design effectively prevents liquid leakage through cut edges, enhancing usability and durability by ensuring tight connections and using appropriate thicknesses and materials for the lamination and film wrapping edges.

Implementation Method 1

The first side may be wrapped within the film wrapping edge

Methodology Applied

Scientific EffectPhysical containment: Physical Containment

Implementation Method 2

An inner surface and an outer surface of the container wall and an inner surface and an outer surface of the container bottom may be equipped with a lamination layer, respectively

Methodology Applied

Scientific EffectLamination: Lamination

Implementation Method 3

The first side may be connected with the second side by at least one of gluing, heat sealing, and ultrasonic welding

Methodology Applied

Scientific EffectHeat sealing:

Implementation Method 4

The first side may be connected with the second side by at least one of gluing, heat sealing, and ultrasonic welding

Methodology Applied

Scientific EffectUltrasonic welding: Ultrasonic Vibration

Data Source

PatentUS12552576B2Anti-leakage paper containers

Publication Date: 2026.02.17 ZHEJIANG SENMENG PACKAGING CO LTD

AI summary

Embodiments of the present disclosure provide an anti-leakage paper container, comprising a container wall and a container bottom. A lower end of the container wall is connected with the container bottom. The container wall is composed of a connecting cardboard. The connecting cardboard includes a first side and a second side. The first side and the second side lap each other to form a cylinder, and the first side is located on an inner side of the cylinder. An inner surface and an outer surface of the container wall and an inner surface and an outer surface of the container bottom are equipped with a lamination layer, respectively. The first side is provided with a film wrapping edge, and the first side is wrapped within the film wrapping edge.