Bread Slicer Knife with Variable Thickness Profile
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Solution Overview
Problem
Bread slicers face issues with fresh bread's high moisture content causing adhesion between the knife and the bread, leading to damage and difficult cleaning due to oil application, and existing knife designs either compromise on stability or require extensive cleaning efforts.
Innovation Solution
A knife with a central thickness between 0.5 mm and 2.0 mm, preferably 0.8 mm to 1.5 mm, and a large diameter, eliminating the need for oil by minimizing restoring and frictional forces, and optionally coated with polytetrafluoroethylene for reduced friction, allowing for a stable, easy-to-clean design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a film of oil is applied to the knife to reduce adhesion between the knife and bread, then the adhesion is significantly reduced, but the cleaning effort and time increase considerably
Solution Approach 1:
The invention extracts and eliminates the oil film from the system by using a knife geometry that inherently prevents adhesion. The specific thickness profile (thinner in cutting area, thicker in receiving area) removes the need for oil by minimizing the friction surface area between knife and bread, thereby eliminating the cleaning problem associated with oil while maintaining ease of operation
Solution Approach 2:
The invention changes the geometric parameters of the knife, specifically the thickness distribution along its length. By making the knife thinner in the cutting area (0.5-2.0 mm) compared to the receiving area, it alters the physical interaction with bread, reducing adhesion forces without requiring oil, thus solving both the adhesion problem and the subsequent cleaning issue
2Ease of operation
If the cutting area of the knife is made thinner to reduce friction surface area, then adhesion forces are reduced, but the knife stability and ability to resist cutting forces decrease
Solution Approach 1:
The invention applies local quality by creating different thickness zones along the knife length. The cutting area has a reduced thickness (0.5-2.0 mm) to minimize friction and adhesion with the bread, while the receiving area has a greater thickness to provide structural stability and resistance to cutting forces. This localized differentiation allows the knife to simultaneously achieve low adhesion and high stability
Solution Approach 2:
The invention resolves the contradiction by transitioning from a uniform one-dimensional thickness to a varied thickness profile along the length of the knife. This dimensional variation allows the cutting portion to be thin for reduced friction while the rear portion remains thick for stability, effectively decoupling the two conflicting requirements through spatial distribution
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 thin, large-diameter knife minimizes bread adhesion and eliminates the need for oil, simplifying cleaning and maintaining better hygiene while ensuring stability and accurate slicing.
Implementation Method 1
at least one side surface of the knife located in the central area is at least partially provided with a coating that reduces the friction between the side surface and the bread, in particular a coating containing polytetrafluoroethylene
Data Source
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AI summary
The invention relates to a knife (1) of a bread slicer, wherein the knife (1) has: - a receiving area (4) for creating a rotationally fixed connection with a drive shaft rotatable about a rotational axis, - a cutting area (5) rotating about a rotational axis (13) of the knife (1), which is identical with the rotational axis of the drive shaft, and tapering to a point outwards in a cutting plane parallel to the rotational axis (13) of the knife (1), which has a cutting edge (6) at its radially outer end and is provided with teeth, and - a central area (3) arranged between the receiving area (4) and the cutting area (5), in which a thickness (2) of the knife (1) measured parallel to the rotational axis (13) of the knife (1) is constant, wherein the thickness (2) of the knife (1) in the central area (3) is at least as large as the greatest thickness (2) of the knife (1) in the cutting area (5).wherein the greatest distance of the cutting edge (6) from the axis of rotation (13) of the knife (1) is at least 180 mm, preferably at least 200 mm. In order to produce a knife which does not have the disadvantages of the known technologies, it is proposed according to the invention to make the knife (1) in its central region (3) with a thickness (2) between 0.5 mm and 2.0 mm, preferably between 0.8 mm and 1.5 mm.