PVC flooring

1. A PVC flooring, comprising:

a wear-resistant layer, a decorative layer and a substrate layer from top to bottom in order; and

said substrate layer comprising a flexible layer, a strength layer and a correction layer from top to bottom in order and the hardness of the strength layer is 1.05-1.10 times that of said flexible layer and said correction layer;

each of the flexible layer, the strength layer and the correction layer comprising PVC powder and calcium powder, wherein a weight ratio of the PVC powder and the calcium powder in the flexible layer is 1:(2-3), a weight ratio of the PVC powder and the calcium powder in the strength layer is 1:(3-4) and a weight ratio of the PVC powder and the calcium powder in the correction layer is 1:(2-3).

2. The PVC flooring as claimed in claim 1 , wherein the thickness ratio of said flexible layer, said strength layer and said correction layer is 1:(1.8-2.2):1.

3. The PVC flooring as claimed in claim 1 , wherein there is no adhesive between said flexible layer, said strength layer and said correction layer.

4. The PVC flooring as claimed in claim 1 , wherein said flexible layer comprising the following raw materials and the amount of each raw material are shown as below:

calcium powder 267-300 kg

PVC powder 100-133 kg

calcium-zinc stabilizer 7.8-8.2 kg

aids acrylic resin 4.8-5.2 kg

chlorinated polyethylene 5.8-6.2 kg

AC3A.G60-1 stearic acid 1 kg;

said strength layer comprising the following raw materials and the amount of each raw material are shown as below:

calcium powder 300-320 kg

PVC powder 80-100 kg

calcium-zinc stabilizer 6.8-7.2 kg

aids acrylic resin 4.8-5.2 kg

chlorinated polyethylene 3.8-4.2 kg

AC3A.G60-1 stearic acid 1.2 kg;

said correction layer comprising the following raw materials and the amount of each raw material are shown as below:

calcium powder 267-300 kg;

PVC powder 100-133 kg;

calcium-zinc stabilizer 7.8-8.2 kg;

cids acrylic resin 4.8-5.2 kg;

chlorinated polyethylene 5.8-6.2 kg;

AC3A.G60-1 stearic acid 1 kg.

5. The PVC flooring as claimed in claim 1 , wherein said decorative layer comprises a color paper, and said wear-resistant layer comprises a PVC film and/or a paint layer overlaid on the PVC film, with no adhesive used between said wear-resistant layer and said decorative layer.

6. The PVC flooring as claimed in claim 1 , wherein said decorative layer comprises a wood-faced sheet or a bamboo-faced sheet, and said wear-resistant layer comprises a paint layer, and further comprising an adhesive to bond bonding these two layers together.

7. The PVC flooring as claimed in claim 1 , wherein said PVC flooring further comprises a mute layer which is provided below the substrate layer, and said mute layer selected from the group consisting of a cork layer, an IXPE layer, an ethyleno vinyl acetale layer, or a PVC layer, and combinations thereof.

8. The PVC flooring as claimed in claim 5 , wherein a method of producing the PVC flooring comprises the steps of: firstly, obtaining materials A and B by way of extrusion, dividing the material A into two equal portions by using of a dispenser and placing the material B between the two portions of the material A; then forming said substrate layer with materials A and B by means of hot-extruding with a pair of molds; and then using a backside pattern roller to form concave-convex backside patterns on the back surface of said substrate layer; and finally, using an embossing roller to hot-press and calender said wear-resistant layer and said corrective layer on the surface of said substrate layer and simultaneously forming concave-convex surface patterns.

9. The PVC flooring as claimed in claim 6 , wherein a method of producing the PVC flooring comprises the steps of: firstly, obtaining materials A and B by way of extrusion, dividing said material A into two equal portions by using of a dispenser and placing said material B between two portions of said material A; then forming said substrate layer with said material A and B by means of hot-extruding with a pair of molds; and then applying the glue on the surface of said substrate layer and using a hot press to calender the decorative layer; and finally, roll-coating the paint to form the wear-resistant layer.