A continuous lamination method for LVT floor

Abstract

The present invention discloses a continuous lamination method for LVT flooring. A plurality of heating wheels are arranged below the bottom layer of the flooring. The bottom surface of the bottom layer is heated by the heating wheels before lamination, so that the upper and lower surfaces are heated simultaneously. This not only realizes the continuous lamination of the LVT flooring, but also avoids the problems of floor bubbling and loose lamination caused by uneven temperatures of the upper and lower surfaces of the bottom layer. The setting of multiple heating wheels with different parameters further enhances the quality of the lamination process, increases the qualified product rate of the continuous lamination line flooring from 80% to 96%, saves production costs and rework costs, and truly realizes fully automatic continuous lamination.

Description

Technical Field

[0001] The invention relates to the field of floor heating devices, in particular to a continuous laminating method for LVT floors. Background Art

[0002] The traditional LVT floor production process is mixing the base material and the middle layer material, hot pressing, roller coating and tempering, punching, edge cutting, slotting and packaging. The vinyl chloride resin powder, plasticizer, stabilizer and carbon black with a good proportion are added to the mixer, and then the plasticizer and stone powder are added in turn. They are put into the internal mixer, rolled and formed by rollers, cooled and cut into blocks. Canvas, embossed plate, soft film, base material, middle material, frosted sheet, color film and soft film are laid between two steel plates in turn. After being fully pressed, they are put into the hot press. During the period, the temperature and pressure are continuously increased. After about 40 minutes, the soft film can be torn off and the floor is finally formed. After the UV coating is applied by the roller, it is directly baked and cured in the oven under ultraviolet irradiation, cooled in cold water and blown dry. Use a punching machine to cut 5 to 6 pieces, place them regularly on the tray, and finally package them. However, the co-printing process is cumbersome and requires multiple processes to complete. Therefore, a continuous laminating device was developed, in which the laminating and UV of the floor are completed on the same production line, saving process flow, equipment costs and labor costs, and is currently a popular production process.

[0003] However, in the process of continuous lamination, it was found that the traditional equipment base only heats the upper layer for lamination with the wear-resistant layer and printed film, while the lower layer is not heated. The two layers are heated at uneven temperatures, resulting in bulging of the produced floors and a low rate of authenticity. This is a shortcoming of the continuous lamination process. Summary of the invention

[0004] Purpose of the invention: In order to solve the problems existing in the prior art, the present invention provides a continuous bonding method for LVT floors, which effectively improves the quality of finished products, saves production costs and rework costs, and realizes fully automatic continuous bonding.

[0005] Technical solution: To achieve the above-mentioned purpose, the present invention can adopt the following technical solution: a continuous bonding method for LVT flooring, wherein the rolled wear-resistant layer is pulled to a heating roller for heating by a traction roller, the rolled second decorative layer is pulled to a heating roller for heating by a traction roller, the bottom layer is pulled by the traction roller to pass through a horizontal drying tunnel at a uniform speed, and a heating device is provided on the upper layer of the horizontal drying tunnel to heat the upper surface of the bottom layer; and after the upper surface of the bottom layer is heated and smoothly passes through the horizontal drying tunnel, a plurality of heating wheels are provided below, and after the bottom surface of the bottom layer is heated by the heating wheel for the lower surface to be bonded with the heated rolled wear-resistant layer and decorative layer.

[0006] Furthermore, a UV coating device is provided at the rear end of the laminating production line. The laminated floor is transmitted through a transmission line to the UV coating device at the rear end, and UV coating is directly performed on the surface of the floor without the need to be transported to other UV coating lines for coating.

[0007] Furthermore, the air pressure and speed of the multiple heating wheels arranged below the bottom layer are different.

[0008] Furthermore, four heating wheels with different air pressures and speeds are arranged below the bottom layer.

[0009] Furthermore, the air pressure of the first heating wheel is 0.3-1.0 MPa, and the operating speed is 11-18 m / min.

[0010] Furthermore, the air pressure of the second heating wheel is 0.3-0.9 MPa, the operating speed is 10-18 m / min, the temperature of the electric heating box is 200-300° C., and the conveying wheel speed is 13-18 m / min.

[0011] Furthermore, the air pressure of the third heating wheel is 0.3-0.7 MPa, the operating speed is 11-15 m / min, the temperature of the electric heating box is 200-300°C, and the conveying wheel speed is 13-18 m / min.

[0012] Furthermore, the air pressure of the fourth heating wheel is 0.3-0.7 MPa, the operating speed is 11-15 m / min, the temperature of the electric heating box is 160-300° C., and the conveying wheel speed is 11-18 m / min.

[0013] Furthermore, an embossing roller heating wheel is provided after the fourth heating wheel, with an air pressure of 0.3-0.9 MPa, a running speed of 11-18 m / min, and a laminating speed of 11-14 m / min.

[0014] Furthermore, the laminated floor is cooled by a cold water tank, and the speed of the conveyor belt in the tank is adjusted according to the laminating speed, with a processing speed of 7 to 9 m / min.

[0015] Beneficial effects: The present invention has the following advantages:

[0016] (1) The bottom of the floor is equipped with multiple heating wheels. The bottom surface of the bottom layer is heated by the heating wheels before bonding, achieving simultaneous heating of the upper and lower surfaces. This not only enables continuous bonding of the LVT floor, but also avoids problems such as floor bubbling and loose bonding caused by uneven temperatures on the upper and lower surfaces of the bottom layer.

[0017] (2) The setting of multiple heating wheels with different parameters further enhances the quality of the laminating process, increasing the qualified product rate of the continuous laminating line floor from 80% to 96%, saving production costs and rework costs, and truly realizing fully automatic continuous laminating. DETAILED DESCRIPTION

[0018] Embodiment 1:

[0019] A continuous lamination method for LVT flooring comprises the following steps:

[0020] (1) The rolled wear-resistant layer is pulled by a traction roller to a heating roller for heating, the rolled second decorative layer is pulled by a traction roller to a heating roller for heating, the bottom layer is pulled by the traction roller to pass through a horizontal drying tunnel at a uniform speed, and a heating device is provided on the upper layer of the horizontal drying tunnel to heat the upper surface of the bottom layer; and after the upper surface of the bottom layer is heated and smoothly passes through the horizontal drying tunnel, a plurality of heating wheels are provided below, and the bottom surface of the bottom layer is heated by the heating wheels to heat the lower surface, and then the bottom surface is bonded to the heated rolled wear-resistant layer and decorative layer;

[0021] Four heating wheels with different air pressures and speeds are arranged under the bottom layer; the air pressure of the first heating wheel is 0.5MPa, and the operating speed is 12m / min; the air pressure of the second heating wheel is 0.5MPa, and the operating speed is 12m / min, the temperature of the electric heating box is 200℃, and the conveying wheel speed is 13m / min; the air pressure of the third heating wheel is 0.3MPa, and the operating speed is 11m / min, the temperature of the electric heating box is 200℃, and the conveying wheel speed is 13m / min; the air pressure of the fourth heating wheel is 0.3MPa, and the operating speed is 11m / min, the temperature of the electric heating box is 160℃, and the conveying wheel speed is 11m / min; an embossing roller heating wheel is also arranged after the fourth heating wheel, with an air pressure of 0.3MPa, an operating speed of 11m / min, and a laminating speed of 11m / min.

[0022] (2) The laminated floor is cooled in a cold water tank, and the speed of the conveyor belt in the water tank is adjusted according to the laminating speed. The processing speed is 7m / min;

[0023] (3) After being cooled in the cold water tank, the floor is transported through a transmission line to the UV coating device at the rear end, and UV coating is directly performed on the floor surface without being transported to other UV coating lines for coating.

[0024] (4) Stand still for punching, inspection, and completion.

[0025] Embodiment 2:

[0026] A continuous lamination method for LVT flooring comprises the following steps:

[0027] (1) The rolled wear-resistant layer is pulled by a traction roller to a heating roller for heating, the rolled second decorative layer is pulled by a traction roller to a heating roller for heating, the bottom layer is pulled by the traction roller to pass through a horizontal drying tunnel at a uniform speed, and a heating device is provided on the upper layer of the horizontal drying tunnel to heat the upper surface of the bottom layer; and after the upper surface of the bottom layer is heated and smoothly passes through the horizontal drying tunnel, a plurality of heating wheels are provided below, and the bottom surface of the bottom layer is heated by the heating wheels to heat the lower surface, and then the bottom surface is bonded to the heated rolled wear-resistant layer and decorative layer;

[0028] Four heating wheels with different air pressures and speeds are arranged under the bottom layer; the air pressure of the first heating wheel is 1.0MPa, and the operating speed is 18m / min; the air pressure of the second heating wheel is 0.9MPa, the operating speed is 18m / min, the temperature of the electric heating box is 300℃, and the conveying wheel speed is 18m / min; the air pressure of the third heating wheel is 0.7MPa, the operating speed is 15m / min, the temperature of the electric heating box is 300℃, and the conveying wheel speed is 18m / min; the air pressure of the fourth heating wheel is 0.7MPa, the operating speed is 15m / min, the temperature of the electric heating box is 300℃, and the conveying wheel speed is 18m / min; an embossing roller heating wheel is also arranged after the fourth heating wheel, with an air pressure of 0.9MPa, an operating speed of 18m / min, and a laminating speed of 14m / min.

[0029] (2) The laminated floor is cooled in a cold water tank, and the speed of the conveyor belt in the water tank is adjusted according to the laminating speed. The processing speed is 9m / min;

[0030] (3) After being cooled in the cold water tank, the floor is transported through a transmission line to the UV coating device at the rear end, and UV coating is directly performed on the floor surface without being transported to other UV coating lines for coating.

[0031] (4) Stand still for punching, inspection, and completion.

[0032] Embodiment 3:

[0033] A continuous lamination method for LVT flooring comprises the following steps:

[0034] (1) The rolled wear-resistant layer is pulled by a traction roller to a heating roller for heating, the rolled second decorative layer is pulled by a traction roller to a heating roller for heating, the bottom layer is pulled by the traction roller to pass through a horizontal drying tunnel at a uniform speed, and a heating device is provided on the upper layer of the horizontal drying tunnel to heat the upper surface of the bottom layer; and after the upper surface of the bottom layer is heated and smoothly passes through the horizontal drying tunnel, a plurality of heating wheels are provided below, and the bottom surface of the bottom layer is heated by the heating wheels to heat the lower surface, and then the bottom surface is bonded to the heated rolled wear-resistant layer and decorative layer;

[0035] Four heating wheels with different air pressures and speeds are arranged under the bottom layer; the air pressure of the first heating wheel is 0.7MPa, and the operating speed is 16m / min; the air pressure of the second heating wheel is 0.7MPa, the operating speed is 15m / min, the temperature of the electric heating box is 260℃, and the conveying wheel speed is 15m / min; the air pressure of the third heating wheel is 0.5MPa, the operating speed is 13m / min, the temperature of the electric heating box is 260℃, and the conveying wheel speed is 15m / min; the air pressure of the fourth heating wheel is 0.5MPa, the operating speed is 13m / min, the temperature of the electric heating box is 220℃, and the conveying wheel speed is 16m / min; an embossing roller heating wheel is also arranged after the fourth heating wheel, with an air pressure of 0.6MPa, an operating speed of 16m / min, and a laminating speed of 13m / min.

[0036] (2) The laminated floor is cooled in a cold water tank, and the speed of the conveyor belt in the water tank is adjusted according to the laminating speed. The processing speed is 8m / min;

[0037] (3) After being cooled in the cold water tank, the floor is transported through a transmission line to the UV coating device at the rear end, and UV coating is directly performed on the floor surface without being transported to other UV coating lines for coating.

[0038] (4) Stand still for punching, inspection, and completion.

[0039] Comparative Example 1:

[0040] The other process steps are the same as those in Example 3, except that four heating wheels are not provided.

[0041] The finished floor products of Example 3 and Comparative Example 1 were tested for bubbling and adhesion strength. The qualified product rate of the floor prepared in Example 3 was 96%, while that of the floor prepared by conventional process in Comparative Example 1 was only 80%.

Claims

1. A continuous lamination method for LVT flooring, characterized in that: The rolled wear-resistant layer is pulled to the heating roller for heating by the pulling roller, the rolled second decorative layer is pulled to the heating roller for heating by the pulling roller, the bottom layer is pulled by the pulling roller to pass through the horizontal drying tunnel at a uniform speed, the upper layer of the horizontal drying tunnel is provided with a heating device to heat the upper surface of the bottom layer; and after the upper surface of the bottom layer is heated and smoothly passes through the horizontal drying tunnel, a plurality of heating wheels are provided below, the bottom surface of the bottom layer is heated by the heating wheel to heat the lower surface, and then is bonded with the rolled wear-resistant layer and decorative layer that have been heated.

2. The continuous lamination method of LVT floor according to claim 1, characterized in that: A UV coating device is installed at the back end of the laminating production line. The laminated floor is transported through a transmission line to the UV coating device at the back end, where UV coating is directly applied to the floor surface without the need to be transported to other UV coating lines for coating.

3. The continuous lamination method of LVT floor according to claim 1, characterized in that: The air pressure and speed of the multiple heating wheels arranged below the bottom layer are different.

4. The continuous lamination method of LVT floor according to claim 3, characterized in that: Four heating wheels with different air pressures and speeds are arranged below the bottom layer.

5. The continuous lamination method of LVT floor according to claim 4, characterized in that: The air pressure of the first heating wheel is 0.3-1.0 MPa, and the operating speed is 11-18 m / min.

6. The continuous lamination method of LVT floor according to claim 4, characterized in that: The air pressure of the second heating wheel is 0.3-0.9 MPa, the operating speed is 10-18 m / min, the temperature of the electric heating box is 200-300°C, and the conveying wheel speed is 13-18 m / min.

7. The continuous lamination method of LVT floor according to claim 4, characterized in that: The air pressure of the third heating wheel is 0.3-0.7 MPa, the operating speed is 11-15 m / min, the temperature of the electric heating box is 200-300°C, and the conveying wheel speed is 13-18 m / min.

8. The continuous lamination method of LVT floor according to claim 4, characterized in that: The air pressure of the fourth heating wheel is 0.3-0.7 MPa, the operating speed is 11-15 m / min, the temperature of the electric heating box is 160-300°C, and the conveying wheel speed is 11-18 m / min.

9. The continuous lamination method of LVT floor according to claim 8, characterized in that: An embossing roller heating wheel is provided after the fourth heating wheel, with an air pressure of 0.3-0.9 MPa, a running speed of 11-18 m / min, and a laminating speed of 11-14 m / min.

10. The continuous lamination method of LVT floor according to claim 1, characterized in that: The laminated floor is cooled in a cold water tank, and the speed of the conveyor belt in the water tank is adjusted according to the laminating speed. The processing speed is 7 to 9 m / min.