A method of forming a layering structure of a plastic flooring comprises steps of:
- A) providing equipment comprising a co-extrusion unit, a first rolling mechanism, a second rolling mechanism, and a roller unit wherein the co-extrusion unit includes a first extruder, a second extruder, a third extruder, and a material distributor, wherein the first, second, third extruders are configured to extrude different melted plastic materials, and a respective one of multiple guide tubes is defined between an opening of each of the first, second, third extruders and a first end portion of the material distributor, wherein the material distributor has multiple conduits configured to gather the melted plastic materials from the first, second, third extruder;
- wherein the roller unit is mounted on a support frame and includes a first delivery roller, a second delivery roller, a contact roller, two pattern rollers, a first guide roller, a second guide roller, and a third guide roller which are arranged along a horizontal direction of the support frame, wherein the first delivery roller is fixed above a top of the support frame, and the second delivery roller is defined between the first delivery roller and the support frame, alternatively, the first delivery roller is fixed beside an end of the support frame, and the second delivery roller is defined between the first delivery roller and the support frame;
- the contact roller is located on the top or the end of the support frame and beside the first delivery roller and the second delivery roller,
- wherein a diameter of the contact roller is more than a diameter of each of the first delivery roller and the second delivery roller, the first guide roller is arranged on the contact roller, the second guide roller is arranged beside the contact roller and the first guide roller, and the third guide roller is fixed beside the contact roller and the second guide roller away from the first guide roller;
- B) forming a substrate using the co-extrusion unit wherein the substrate includes at least two sheets, and a hardness of a first sheet is different from a hardness of a second sheet, and the substrate is delivered to the roller unit;
- C) delivering a printing layer, wherein the printing layer has predetermined textures formed on an outer surface thereof and is delivered to the roller unit by the second rolling mechanism;
- D) delivering an abrasion resistant layer, wherein the abrasion resistant layer is delivered to the roller unit by the first rolling mechanism;
- E) rolling and pressing the substrate, the printing layer, and the abrasion resistant layer by way of the roller unit in following sub-steps of:
- E1) forming a predetermined thickness of the substrate and delivering the substrate to the contact roller, wherein the substrate is made of the different melted plastic materials from a supply head of the material distributor and is delivered to the contact roller via the first delivery roller, the second delivery roller, and the first guide roller;
- E2) delivering the printing layer to the contact roller via the second guide roller so as to contact the printing layer with the substrate on the contact roller;
- E3) delivering the abrasion resistant layer to the contact roller via the third guide roller so as to contact and stack the abrasion resistant layer with the printing layer on the contact roller;
- E4) contacting and stacking the substrate, the printing layer, and the abrasion resistant layer on the contact roller to form the layering structure, wherein the layering structure is delivered to the two pattern rollers via a fourth guide roller;
- and
- E5) forming patterns on the layering structure by using the two pattern rollers.