Door Leaf Bonding Pattern for Rigidity and Acoustics
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Solution Overview
Problem
Existing door leaf designs in box-cover construction struggle to balance cost-effectiveness, mechanical rigidity, sound insulation, and appearance, often requiring additional reinforcements that increase weight and complexity, while compromising soundproofing performance.
Innovation Solution
A door leaf with a sandwich construction where the first and second metal sheets are partially bonded to a door panel using alternating bonding patterns, creating a rigid and acoustically soft connection without continuous gluing, which simplifies production and eliminates the need for additional stiffening inserts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If continuous gluing is used to bond metal sheets to door panel, then mechanical rigidity is improved, but sound insulation deteriorates
Solution Approach 1:
The bonding area is segmented into discrete bonding zones rather than continuous gluing. The door panel is bonded to metal sheets at specific segmented locations, creating isolated bonding regions that maintain structural rigidity while preserving sound insulation through unbonded gaps.
Solution Approach 2:
Different regions of the door assembly have different bonding characteristics. Bonding is applied locally at specific zones where mechanical strength is needed, while other regions remain unbonded to maintain acoustic performance, creating local quality variations in the bonding structure.
2Strength
If additional stiffening inserts are added to enhance rigidity, then mechanical strength is improved, but device complexity and weight increase
Solution Approach 1:
The stiffening function is merged with the bonding structure itself. The door panel and metal sheets form an integrated bonded assembly where the bonding zones create inherent stiffening without requiring separate insert elements, eliminating additional components while maintaining rigidity.
Solution Approach 2:
The door panel and metal sheets provide their own stiffening through the strategic bonding arrangement. The structure serves its own reinforcement needs through the bonding pattern design, eliminating the need for external stiffening inserts or additional reinforcement elements.
3Object-affected harmful factors
If pointwise gluing through holes in intermediate layer is used, then sound insulation is improved, but manufacturing complexity increases
Solution Approach 1:
The intermediate layer with holes is extracted and replaced by direct bonding between the door panel and metal sheets. The bonding is achieved without requiring punched holes or intermediate carrier layers, simplifying the manufacturing process while maintaining the sound insulation benefits of discontinuous bonding.
4Object-affected harmful factors
If checkerboard-like gluing pattern is used, then sound insulation is improved, but production complexity increases
Solution Approach 1:
The bonding pattern is segmented into discrete zones arranged in a systematic pattern. This segmentation provides the sound insulation benefits of non-continuous bonding while using a regular, repeatable pattern that simplifies manufacturing compared to complex checkerboard designs, improving production efficiency.
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 achieves a cost-effective, rigid, and aesthetically pleasing door leaf with enhanced sound insulation and fire protection capabilities, maintaining mechanical integrity without the weight and complexity of additional reinforcements.
Implementation Method 1
The door panel (206) is bonded to the first metal sheet (200) with a first adhesive layer (106) in a first bonding pattern (208) and to the second metal sheet (202) with a second adhesive layer (106a) in a second bonding pattern (212)
Data Source
Figure 1
Figure 2
Figure 3~5
AI summary
The door leaf (10) is formed from two metal sheets (200,202) forming a cavity (204) between the metal sheets and a door panel (206) in the cavity. The door panel is bonded with the metal sheets. The former metal sheet is bonded with the door panel in certain areas with a bonding pattern (208) formed from bonded- and unbonded areas. The latter metal sheet is bonded with the door panel in certain areas with another bonding pattern (212) formed from bonded- and unbonded areas. The two bonding patterns are formed in a different manner. Independent claims are included for the following: (1) a door with a frame; and (2) a method for manufacturing a door leaf.