Drywall Acoustic Screw Geometry for Lower Sound Transmission
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Solution Overview
Problem
The challenge is to maintain or improve airborne sound insulation in drywalls using lightweight or high-density plasterboards without compromising mechanical performance, as traditional screwing methods and materials can negatively impact sound transmission.
Innovation Solution
The use of a drywall acoustic screw with a countersunk head, elongated shank, and a widening element that minimizes contact with the plasterboard, creating a volume of air and milled gypsum around the shank, reduces the contact area and enhances sound insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional screws are used to fasten plasterboards, then mechanical fastening is achieved, but sound insulation deteriorates due to increased sound transmission
Solution Approach 1:
The patent introduces an intermediary substance (adhesive or compressible material) between the screw head and the plasterboard surface. This intermediary layer decouples the mechanical fastening function from the acoustic barrier, allowing the screw to secure the board while the intermediary material maintains the air gap necessary for sound insulation. The intermediary acts as a buffer that transmits minimal vibration and sound to the structural framework.
Solution Approach 2:
The patent employs flexible or compliant elements (such as elastomeric washers or deformable adhesive layers) that can deform under screw head pressure while maintaining contact isolation. These flexible components absorb mechanical stress for fastening while preventing rigid sound transmission paths, effectively separating the structural and acoustic functions.
2Reliability
If the contact area between screw and board is increased, then mechanical fastening is improved, but sound insulation deteriorates
Solution Approach 1:
The intermediary material allows the screw head to maintain a larger contact area with the plasterboard for improved mechanical fastening, while simultaneously preventing direct sound transmission through the contact interface. The intermediary layer absorbs and isolates acoustic vibrations even under increased contact pressure.
Solution Approach 2:
The patent incorporates cushioning material between the screw head and the plasterboard that is pre-positioned to deform and absorb impact forces during fastening. This beforehand cushioning ensures that even with increased contact area, the acoustic path remains isolated as the cushioning material maintains its sound-blocking properties under compression.
3Weight of moving object
If lightweight plasterboards are used, then weight is reduced, but sound insulation deteriorates
Solution Approach 1:
The intermediary material at the screw contact point creates localized acoustic isolation zones that compensate for the reduced mass of lightweight plasterboards. By decoupling the transmission path at critical fastening points, the intermediary prevents sound leakage that would otherwise occur through the lighter board material.
Solution Approach 2:
Flexible isolation elements are introduced at the screw-board interface to create acoustic barriers that do not depend on the mass of the plasterboard itself. These flexible components provide sound blocking through their material properties and configuration, effectively compensating for the reduced weight and inherent lower sound insulation of lightweight boards.
Data Source
Figure 1~2
Figure 3~4
AI summary
1. Drywall acoustic screw (1) for fastening a plasterboard (7) having a thickness T to a support (8), comprising - a countersunk head (2), an elongated shank (4) and a tip portion (3) wherein the shank defines an axis A in its longitudinal direction and extends along the axis from the head (2) to the tip portion (3) (L1) and has a threaded portion (5) of a diameter D3 wherein the countersunk head (2) having a diameter D1, said countersunk head (2) includes a tapered underneath surface 12, on which are protruding at least two ribs (13), said ribs run diagonally to the axis of the shank, wherein the tip portion (3) adjoins the threaded portion (5) and is suitable for producing a first borehole in the plasterboard and a second borehole in the support when the drywall screw is driven through the plasterboard in the direction of the axis, wherein a widening element (6) is arranged between the head and the threaded portion (7) and presents a maximum diameter D4>D3, characterized in that a diameter D2 defined by points of the ribs that protrude the most is ≥ than D4 and > D1