Molded Fiber Razor Handle With Reinforced Hollow Structure

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Solution Overview

Problem

Existing razors, particularly those with cardboard handles, face challenges in achieving an attractive shape and are laborious to manufacture, while disposable razors lack sustainability and system razors have limited handle longevity.

Innovation Solution

A molded fiber handle with an elongated hollow body and reinforcing elements, made using a suction mold process, combined with a biodegradable thermoplastic adapter piece for a replaceable razor head, providing structural stability and ease of manufacturing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the handle is made from cardboard or paperboard, then the manufacturing process becomes laborious and achieving an attractive shape becomes problematic, but using molded fiber parts allows for easier manufacturing and attractive curved surfaces

Engineering Contradiction:

Improveease of manufactureVSAvoiddevice complexity

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The patent changes the material form from flat cardboard/paperboard to three-dimensional molded fiber parts, transforming the manufacturing approach from laborious cutting and assembly to a more efficient molding process that produces complex shapes in one step

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The handle uses molded fiber parts that combine the benefits of natural fiber materials with modern molding techniques, creating a composite structure that is both environmentally friendly and manufacturally efficient

Inventive Principle:

Principle #40Composite materials

2Shape

If the handle is made as a hollow shell, then the shape can be adapted to intended use and mechanical loads with pleasant curved surfaces, but the structural stability may be reduced without reinforcing elements

Engineering Contradiction:

ImproveshapeVSAvoidstructural stability

Core Design Contradiction:

ShapeVSStrength

Solution Approach 1:

The handle features curved surfaces that follow the contours of the hand for comfortable grip, with the curvature optimized to distribute mechanical loads effectively while maintaining structural integrity

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

Reinforcing elements are pre-integrated into the hollow shell structure during the molding process, providing structural stability before the handle is assembled into the final razor product

Inventive Principle:

Principle #10Preliminary action

3Ease of manufacture

If disposable razors are used, then ease of disposal is achieved, but environmental sustainability is compromised

Engineering Contradiction:

Improveease of disposalVSAvoidenvironmental sustainability

Core Design Contradiction:

Ease of manufactureVSLoss of substance

Solution Approach 1:

The razor handle is designed to be biodegradable and compostable, allowing it to be safely discarded in the environment without causing harm, while the replaceable razor head can be recovered and reused multiple times before disposal

Inventive Principle:

Principle #34Discarding and recovering

Solution Approach 2:

The handle uses biodegradable fiber materials that are inexpensive and environmentally friendly, accepting a shorter lifespan in exchange for reduced environmental impact and ease of disposal

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

4Loss of substance

If system razors with replaceable razor heads are used, then sustainability is improved, but the handle life span is limited compared to traditional system razors

Engineering Contradiction:

ImprovesustainabilityVSAvoidhandle life span

Core Design Contradiction:

Loss of substanceVSDuration of action of stationary object

Solution Approach 1:

The razor is divided into two separable components: a durable handle that can be reused multiple times and a replaceable razor head, allowing the handle to maintain its structural integrity and longevity while the blade component is replaced when worn

Inventive Principle:

Principle #1Segmentation

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 solution offers an environmentally friendly, easily manufacturable razor with a comfortable grip and durable handle design, allowing for replaceable razor heads and biodegradable components.

Implementation Method 1

The production of molded pulp parts by sucking pulp fibers from an aqueous fiber pulp using a suction mold is known

Methodology Applied

Scientific EffectSuction: Suction

Data Source

PatentUS20260048520A1Shaving device

Publication Date: 2026.02.19 WILKINSON SWORD GMBH

AI summary

A shaving device includes a handle attached to a razor head carrying at least one razor blade. The handle is a molded fiber part having an elongated hollow body open on one side. The shaving device may also include reinforcing elements arranged in the elongated hollow body that forms the handle, a plurality of reinforcing ribs spaced apart from one another and traversing the elongated hollow body of the handle in a transverse direction with respect to the handle, reinforcing ribs that completely fill a U-shaped cross-section of the elongated hollow body of the handle, reinforcing ribs having a height that is significantly less than a height of the handle, and/or at least one longitudinal rib in the elongated hollow body of the handle. The molded fiber part may include a mixture of long fibers, short fibers and microfibrils. The fiber blend may have a mixture of hemp fibers.