Absorber to absorb acoustic sound waves and method for its production

A method for producing an absorber for absorbing acoustic sound waves, comprising a supporting body (1) and spacers (2) which protrude from the supporting body, and a covering layer (5) connected to the spacers (2) of the supporting body (1) to close chamber-like intermediate cavities (7) between the supporting body (1) and spacers (2), wherein the spacers (2) are integrally preformed with the supporting body (1) to define a basic constructional unit (10), the covering layer (5) being included in a covering unit (11) applied onto the basic constructional unit (10), the covering unit (11) being deformed and thin, the covering unit (11) being able to vibrate in certain regions at least, wherein the covering layer is deformed and connected with the basic constructional unit, characterized in that the method comprises the steps of:

• performing the basic constructional unit (10);
• subsequently deforming the covering unit (11) from a more particularly straight plane, directly onto open front ends (3) of the spacers (2) and onto an edge (4) of the preformed basic constructional unit (10) by means of a stamp (8) which is configured to have a front face (9) in correspondence with the contours of the finished covering unit (11);
• and
• connecting, using pressure and/or heat, the covering unit (11) to the basic constructional unit (10).

A method for producing an absorber for absorbing acoustic sound waves, the method comprising the steps of:

• deep-drawing, transfer-molding or injection molding thermoplastic or thermosetting material to form a basic constructional unit (10);
• performing the basic constructional unit (10) to have spacers (2) protruding from an integral supporting body (1);
• deforming a covering unit (11) comprising a covering layer (5) from a more particularly straight plane, directly onto open front ends (3) of said spacers (2) and onto an edge (4) of the preformed basic constructional unit (10) by means of a stamp (8) which is configured to have a front face (9) in correspondence with the contours of the finished deformed covering unit (11);
• and
• connecting the covering layer (5), using pressure and/or heat, to the basic constructional unit (10) to close chamber-like intermediate cavities (7) between the supporting body (1) and spacers (2), said connection of the covering layer (5) both with the edge (4) of the basic constructional unit (10) and with open front ends (3) of the spacers (2) being by a substantially rigid connection (6) such that the covering layer (5) is deformed and thin, and such that the covering layer (5) is able to vibrate at least in certain regions in a membrane-like manner thereby transferring sound waves into said intermediate cavities (7).

An absorber for acoustic waves, comprising:

• a supporting body;
• spacers protruding from said supporting body to define chamber-like intermediate cavities between said supporting body and spacers;
• and
• a covering layer connected to said spacers to close said intermediate cavities, said covering layer having resilient portions between said spacers to vibrate to transfer acoustic waves into said intermediate cavities.

A method for making an absorber for acoustic waves, the method comprising the steps of:

• forming a supporting body;
• forming spacers connected to the supporting body to define chamber-like intermediate cavities between the supporting body and spacers;
• deforming a covering layer directly onto the spacers and onto the supporting body by a stamp having a front face corresponding to the contours of the spacers and supporting body, the front face of the stamp being continuous so that said deforming of the covering layer onto the spacers and supporting body closes the intermediate cavities;
• and
• connecting the deformed covering layer to the spacers and supporting body such that resilient portions of the covering layer between the spacers and supporting body vibrate to transfer sound waves into the intermediate cavities.