PVC board and method of manufacture

1. A polyvinyl chloride (PVC) board comprising:

a transparent wear layer as a top layer;

a PVC film as a presentation layer, permanently coupled to the top layer; and

a base PVC layer permanently coupled to the presentation layer, the base PVC layer containing a compressible elastomeric impact modifier;

wherein the PVC board contains no plasticizer; and

wherein the base layer is a foam formed from a PVC mixture comprising by weight:

100 parts polyvinyl chloride resin,

4-20 parts compressible elastomeric impact modifier,

150-300 parts calcium carbonate,

6-8 parts calcium/zinc stabilizing compound,

0.2-1.0 parts foaming agent,

4-8 parts foaming regulator, and

1.0-2.0 parts lubricant.

2. The PVC board of claim 1 , wherein the top layer is finished with a surface that is glossy, matte, or rough.

3. The PVC board of claim 1 , wherein the base layer is embossed with a uniform geometric pattern.

4. The PVC board of claim 1 , wherein:

the presentation layer simulates the appearance of a building material that is not PVC,

the top layer is embossed with a texture simulating the texture of the building material simulated by the presentation layer.

5. A polyvinyl chloride (PVC) board comprising:

a transparent wear layer as a top layer;

a PVC film as a presentation layer, permanently coupled to the top layer; and

a base PVC layer permanently coupled to the presentation layer, the base PVC layer containing a compressible elastomeric impact modifier;

wherein the PVC board contains no plasticizer; and

wherein the base layer is a foam formed from a PVC mixture consisting of, by weight:

100 parts polyvinyl chloride resin,

4-20 parts compressible elastomeric impact modifier,

150-300 parts calcium carbonate,

6-8 parts calcium/zinc stabilizing compound,

0.2-1.0 parts foaming agent,

4-8 parts foaming regulator, and

1.0-2.0 parts lubricant.

6. A method of manufacturing the PVC board according to claim 1 comprising:

forming a three-layer PVC composite, including:

forming the base PVC layer;

forming the presentation layer and permanently fusing it to the base layer; and

forming the wear layer and permanently fusing it to the presentation layer;

processing the three-layer PVC composite to form the PVC board.

7. The method of claim 6 ,

wherein the forming of the base PVC layer, the forming of the presentation layer, and the forming of the wear layer are each carried out by extrusion in an extruder.

8. The method of claim 6 , further comprising:

hot rolling the PVC composite between a set of rollers that embosses the wear layer.

9. The method of claim 6 , further comprising:

hot rolling the PVC composite between a set of rollers that embosses the base layer.

10. The method of claim 6 , wherein the presentation layer is formed from a first sheet having a first visible design aligned in a first direction, and a second sheet having a second visible design aligned in a second direction different than the first direction.

11. The method of claim 6 , wherein the presentation layer has an appearance that simulates the appearance of a material that is not PVC.

12. The method of claim 11 , further comprising:

embossing the top layer to have a surface that simulates a surface of the genuine material that is simulated by the appearance of the presentation layer.

13. The method of claim 6 , further comprising:

before forming the three layers, mixing raw materials including a PVC component for each layer in a respective mixer to form three separate PVC mixtures;

heating and stirring each of the PVC mixtures until it is a homogeneous hot PVC mixture;

cooling the hot PVC mixture to a predetermined temperature until it has a predetermined target viscosity; and

extruding the cooled viscous PVC through a twin screw PVC extruder to form a respective layer.

14. The method of claim 13 , wherein:

each of the three PVC mixtures is heated in their respective mixer to 110-120° C. to form the hot PVC mixture; and

each of the hot PVC mixtures is cooled in their respective mixer to between 35-45° C. while stirring.