Hybrid Pulp and Thermoformed Container Snap-Fit Assembly

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Solution Overview

Problem

Hybrid containers combining pulp and thermoformed plastic components face challenges in maintaining structural integrity and recyclability, as pulp materials lose rigidity under mechanical deformation, while thermoformed plastic is not renewable or compostable.

Innovation Solution

A hybrid container design featuring a pulp tray with a rim ear that snaps into a thermoformed frame or lid with protrusions, allowing for easy assembly and separation for recycling, enhancing the proportion of recyclable and compostable content.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If pulp material is used to create a container, then renewable and recyclable content is increased, but structural integrity and rigidity are reduced when subjected to mechanical deformation

Engineering Contradiction:

Improverenewable and recyclable contentVSAvoidstructural integrity

Core Design Contradiction:

Adaptability or versatilityVSStrength

Solution Approach 1:

The invention uses a composite structure combining pulp material for the tray body with a thermoformed plastic lid. The pulp tray provides renewable, recyclable, and compostable characteristics, while the thermoformed plastic lid provides structural rigidity, heat resistance, and sealing capability. This composite approach allows the container to maintain both environmental benefits and structural integrity.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The container is divided into separable components: a pulp tray and a thermoformed plastic lid that can be easily separated. This segmentation allows each component to be recycled or composted independently, maximizing the renewable and recyclable content while maintaining structural integrity during use through the snap-fit connection mechanism.

Inventive Principle:

Principle #1Segmentation

2Strength

If thermoformed plastic is used to create a container, then structural integrity and rigidity are maintained, but renewable and recyclable content is reduced

Engineering Contradiction:

Improvestructural integrityVSAvoidrenewable and recyclable content

Core Design Contradiction:

StrengthVSAdaptability or versatility

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different parts of the container are made from different materials optimized for their specific functions: the pulp tray provides renewable, recyclable, and compostable characteristics for the main body, while the thermoformed plastic lid provides structural rigidity, heat resistance, and sealing capability where needed.

Inventive Principle:

Principle #3Local quality

3Ease of manufacture

If simple hybrid containers with plastic lids and pulp cups are used, then assembly is simple, but structural integrity is compromised during handling

Engineering Contradiction:

Improveassembly simplicityVSAvoidstructural integrity

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The lid connection mechanism uses a dynamic snap-fit design where the lid can be easily attached and detached by applying force to the protrusion on the lid's side wall. This dynamic connection provides structural integrity during normal use while maintaining ease of assembly and disassembly for recycling purposes.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The lid is pre-formed with protrusions on its side wall that are designed to engage with corresponding features on the pulp tray. This preliminary design of the connection mechanism ensures that structural integrity is maintained during handling while keeping assembly simple - users only need to press the lid onto the tray and the snap-fit connection automatically secures it.

Inventive Principle:

Principle #10Preliminary action

4Strength

If injection molded hybrid containers requiring assembly in an injection molder are used, then structural integrity is maintained, but manufacturing complexity and equipment requirements increase

Engineering Contradiction:

Improvestructural integrityVSAvoidmanufacturing equipment requirements

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The container is divided into separately manufacturable components: the pulp tray can be manufactured using conventional pulp forming equipment, and the thermoformed plastic lid can be manufactured using standard thermoforming equipment. This segmentation eliminates the need for complex injection molding equipment while maintaining structural integrity through the snap-fit connection design.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The connection between the pulp tray and thermoformed plastic lid is achieved through a mechanical intermediary snap-fit mechanism rather than requiring complex injection molding equipment. The protrusions on the lid engage with corresponding features on the tray, providing structural integrity through a simple mechanical connection that can be assembled with basic equipment.

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

The hybrid container maintains structural advantages of thermoformed plastic while increasing renewable and recyclable content, allowing for easy assembly and separate recycling of pulp and plastic components.

Implementation Method 1

thermoformed frame with a rib having inside and outside walls

Methodology Applied

Scientific EffectThermal forming: Heat Treatment

Implementation Method 2

the pulp tray can be attached to the thermoformed frame by snapping the ear into position above the protrusion

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Data Source

PatentUS8870015B1Hybrid pulp and thermoformed containers

Publication Date: 2014.10.28 PLASTIC INGENUITY

AI summary

A hybrid thermoformed/pulp container comprising a pulp tray with a rim that includes an ear; and a thermoformed frame with a rib that includes a protrusion, wherein the pulp tray can be attached to the thermoformed frame by snapping the ear into position above the protrusion. Alternative embodiments of the invention include a kit for building the hybrid container, and a method of assembling the hybrid container.