A production process of LVT floor

Abstract

The present invention relates to a LVT floor production process, which has the following process steps: step one, batching, mixing the following materials according to the proportion: PVC resin powder, stone powder, plasticizer, carbon black, stabilizer; step two, PVC online extrusion, putting the mixed materials into the extruder for extrusion, and then entering the mold for molding; step three, UV coating and annealing, using a roller to emboss the front of the molded floor, and using a UV lamp to cure, and then annealing; step four, coating, coating the back of the floor after UV embossing on the front with paint; step five, cutting, cutting the coated floor, deburring and packaging. The present invention has made innovations in the UV coating process through process adjustment testing. After UV on the front, a single coat of paint is used on the back to solve the problem of product size shrinkage and product warping at room temperature and high temperature up to 80°C. A large amount of equipment investment is saved, and product quality requirements are met with a simple and effective process solution.

Description

Technical Field

[0001] The invention relates to the technical field of panels, and in particular to a LVT floor production process. Background Art

[0002] LVT floor is a kind of plastic floor with high elasticity and soft texture, which has good fireproof and impact resistance. The existing press composite LVT floor production line: the raw materials are mixed and stirred and placed in an internal mixer to heat and stir to 110-130℃, and then continue to stir in the roller, discharge the materials, and cool them to form the intermediate-middle material and base material. The base material-middle material is successively mixed with the color film and the wear-resistant layer, and then heated by a boiler to generate steam for a long time. In order to produce output, several or even dozens of presses are required. This LVT floor production line has low automation, large equipment investment, large plant space occupation, high equipment investment cost, high electricity and gas energy consumption, high production cost, many labor, high labor intensity, poor production environment and high pollution, low production capacity and low efficiency, discontinuous production, long cycle, complex operation and other problems. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects of the prior art and provide a LVT floor production process.

[0004] The technical solution to achieve the purpose of the present invention is: a LVT floor production process, comprising the following process steps:

[0005] Step 1: Mix the following materials according to the proportion: PVC resin powder, stone powder, plasticizer, carbon black, stabilizer;

[0006] Step 2: PVC is extruded online, the mixed material is put into the extruder for extrusion, and then enters the mold for molding;

[0007] Step three, UV coating and annealing, the front of the formed floor is embossed with a roller, cured with a UV lamp, and then annealed;

[0008] Step 4: coating: use 15-20g of paint to coat the back of the floor after UV embossing on the front side;

[0009] Step 5: Cutting: The coated floor is cut, deburred and packaged.

[0010] The ingredients described in the above technical solution have the following quality components:

[0011] PVC resin powder 50-75KG, stone powder 200-250KG, plasticizer 20-30KG, carbon black 0.2-0.5KG, stabilizer 2.0-3.0KG.

[0012] The ingredients described in the above technical solution also include 0.2-0.5KG of internal lubricant and 0.2-0.5KG of external lubricant, the internal lubricant is G60, and the external lubricant is PE wax.

[0013] The plasticizer described in the above technical solution is dioctyl phthalate and / or chlorinated polyethylene.

[0014] The ingredients described in the above technical solution have the following mass components: 100-200KG of recycled material.

[0015] In step 1 of the above technical solution, the mixing temperature of the materials is 120°C.

[0016] In step 2, the barrel discharge temperature of the extruder is 50°C;

[0017] In step 2, the mold molding uses a mold temperature controller, the temperature of the mold temperature controller is set at 160-170°C, and the barrel temperature is 160-190°C.

[0018] The temperatures of the extruder zones described in the above technical solution are as follows: zone 1 170-190°C, zone 2 170-190°C, zone 3 170-190°C, zone 4 160-180°C, zone 5 160-180°C, zone 6 155-175°C, and confluence core 150-170°C.

[0019] The temperatures of the molds described in the above technical solution are as follows: mold one 160-180°C, mold two 160-180°C, mold three 170-190°C, mold four 170-190°C, mold five 160-180°C.

[0020] In step 3 of the above technical solution, the rotation speeds of the rollers are as follows: roller one 1100 rpm, roller two 1100 rpm, roller three 950 rpm, roller four 1000 rpm, and roller five 1200 rpm;

[0021] The temperatures of the rollers are as follows: roller one 130-150°C, roller two 140-160°C, roller three 140-160°C, roller four 140-160°C, roller five 140-160°C.

[0022] In step three of the above technical solution, the roller is 10-15 millimeters shallower on the dense part of the embossing than on the loose part of the embossing.

[0023] After adopting the above technical solution, the present invention has the following positive effects:

[0024] (1) The present invention has made innovations in the UV coating process through process adjustment and testing. After UV treatment on the front side, a single coat of 15-20g of paint is applied on the back side to solve the problems of product shrinkage and product warping at room temperature and high temperature up to 80°C. A large amount of equipment investment is saved, and product quality requirements are met with a simple and effective process solution. The LVT floor produced has passed multiple performance tests such as flatness testing, chemical resistance testing, heavy metal testing, shrinkage and warping testing, etc.

[0025] (2) The PVC resin powder in the ingredients of the present invention is an environmentally friendly, non-toxic, odorless renewable resource, which can ensure the overall environmental protection effect and good plasticity of the LVT floor. The stone powder can increase the overall opacity and improve the overall flexibility. The carbon black can ensure that the LVT floor has stable heat resistance and light resistance, and improve the quality of the LVT floor. Since the PVC resin powder itself is a hard material, the addition of plasticizer can make the LVT floor soft, easy to bend, fold, and have good elasticity and easy to shape.

[0026] (3) The temperature of the mold temperature controller of the present invention is set at 160-170°C, the temperature of the barrel is 160-190°C, the temperature of the five zones of the discharge port mold is set at 160-180°C, and the temperature of the cut core is 160-170°C. The main engine speed can reach 450-550rpm. In order to ensure that the depth of the pattern meets customer requirements, we adjust the speed ratio between the rollers and set the roller temperature at 150-170°C. The temperature of the preheating roller is controlled at 130-160°C to better achieve an effective preheating effect on the wear-resistant layer.

[0027] (4) The roller of the present invention makes the dense part of the embossing 10-15 lines lighter than the loose part of the embossing, and the overall texture remains consistent, which not only controls the embossing print on the back, but also avoids the problem of bright lines at the dense texture due to the failure of paint to be applied during UV treatment. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0029] Embodiment 1,

[0030] Step 1: For the first time, weigh and prepare 50-75KG of PVC resin powder, 200-250KG of stone powder, 20-30KG of dioctyl phthalate, 3.0-4.0KG of chlorinated polyethylene, 0.2-0.5KG of carbon black, 2.0-3.0KG of stabilizer, 0.2-0.5KG of G60 polyol fatty acid ester and 0.2-0.5KG of PE wax. The PVC resin powder in the ingredients is an environmentally friendly, non-toxic, odorless renewable resource, which can ensure the overall environmental protection effect and good plasticity of the LVT floor. The stone powder can increase the overall opacity and improve the overall flexibility. The carbon black can ensure that the LVT floor has stable heat resistance and light resistance, and improve the quality of the LVT floor. Since the PVC resin powder itself is a hard material, the addition of plasticizer can make the LVT floor soft, easy to bend, fold, elastic and easy to shape.

[0031] In order to achieve better subsequent material fusion performance, better extrusion effect and stronger flexibility, after the first batching of LVT flooring, 100-200KG of recycled materials are added to the ingredients. The recycled materials here refer to the previous finished products, scraps of finished products, small materials cut by punching, etc., which are collected and crushed and ground into a product.

[0032] Step 2, PVC online extrusion, the main speed of the extruder can reach 450-550rpm, the materials after batching are hot mixed at a temperature of 120℃; then cold mixed at 50℃. After cold mixing, the ingredients of each component are put into the extruder. The temperature of each zone of the extruder is as follows: zone 1 170-190℃, zone 2 170-190℃, zone 3 170-190℃, zone 4 160-180℃, zone 5 160-180℃, zone 6 155-175℃, confluence core 150-170℃. The mixed material is extruded from the extruder and then enters the mold for molding. The mold molding is heated by a mold temperature controller. The temperature of the mold temperature controller is set at 160-170℃, and the barrel temperature is 160-190℃. The temperature of the 5 zones of the discharge port mold is set at 160-180℃, and the temperature of the confluence core is 160-170℃. Specifically, the temperatures of the molds are as follows: mold one 160-180°C, mold two 160-180°C, mold three 170-190°C, mold four 170-190°C, mold five 160-180°C.

[0033] Step three, UV coating and annealing. In order to ensure that the depth of the pattern meets customer requirements, we adjusted the speed ratio between the rollers and set the roller temperature at 150-170℃. The temperature of the preheating roller is controlled at 130-160℃ to better preheat the wear-resistant layer. The front of the formed floor is embossed with rollers. The speed of the rollers is as follows: roller one 1100rpm, roller two 1100rpm, roller three 950rpm, roller four 1000rpm, roller five 1200rpm. And use UV lamp to cure. The temperature of the rollers is as follows: roller one 130-150℃, roller two 140-160℃, roller three 140-160℃, roller four 140-160℃, roller five 140-160℃, and annealing is performed after curing. The product itself is thin, 2.5 / 2.0mm thick. For the dense pattern, it is easy to press on the back, resulting in deep embossing on the back, affecting the appearance. Therefore, the roller should emboss the dense part 10-15 degrees lighter than the loose part. The overall texture is consistent, which not only controls the embossed print on the back, but also avoids the problem of bright lines on the dense texture due to the lack of paint during UV treatment.

[0034] Step 4: coating. Use 15-20g of paint to coat the back of the floor after UV embossing on the front. The paint coating can be one layer or two layers, which can solve the problem of product shrinkage and product warping at room temperature and high temperature up to 80℃. It saves a lot of equipment investment and meets product quality requirements with a simple and effective process solution.

[0035] Step 5: Cutting: The coated floor is cut, deburred and packaged.

[0036] The produced LVT floor has passed many performance tests such as flatness test, chemical resistance test, heavy metal test, shrinkage and warping test, etc., as shown in Table 1:

[0037]

[0038] Table 1

[0039] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A LVT floor production process, characterized in that: The process steps are as follows: Step 1: Mix the following materials according to the proportion: PVC resin powder, stone powder, plasticizer, carbon black, stabilizer; Step 2: PVC is extruded online, the mixed material is put into the extruder for extrusion, and then enters the mold for molding; Step 3: UV coating and annealing: emboss the front of the formed floor with a roller, cure it with a UV lamp, and then anneal it; Step 4: coating: coat the back of the floor with UV embossing on the front with 15-20g of paint; Step 5: Cutting: Cut the coated floor, remove burrs and pack it; In step three, the roller is 10-15 millimeters shallower on the dense part of the embossing than on the loose part of the embossing.

2. The LVT floor production process according to claim 1, characterized in that: The batch has the following mass components: PVC resin powder 50-75KG, stone powder 200-250KG, plasticizer 20-30KG, carbon black 0.2-0.5KG, stabilizer 2.0-3.0KG.

3. The LVT floor production process according to claim 1, characterized in that: The ingredients also include 0.2-0.5 kg of internal lubricant and 0.2-0.5 kg of external lubricant, the internal lubricant is G60, and the external lubricant is PE wax.

4. The LVT floor production process according to claim 1, characterized in that: The plasticizer is dioctyl phthalate and / or chlorinated polyethylene.

5. The LVT floor production process according to claim 2, characterized in that :The ingredients have the following mass components: return material 100-200KG.

6. The LVT floor production process according to claim 1, characterized in that: In step 1, the mixing temperature of the materials is 120°C. In step 2, the barrel discharge temperature of the extruder is 50°C; In step 2, the mold molding uses a mold temperature controller, the temperature of the mold temperature controller is set at 160-170°C, and the barrel temperature is 160-190°C.

7. The LVT floor production process according to claim 1, characterized in that: In step 2, the temperature of each zone of the extruder is as follows: zone 1 170-190°C, zone 2 170-190°C, zone 3 170-190°C, zone 4 160-180°C, zone 5 160-180°C, zone 6 155-175°C, and confluence core 150-170°C.

8. The LVT floor production process according to claim 1, characterized in that: In step 2, the temperatures of the molds are as follows: mold one 160-180°C, mold two 160-180°C, mold three 170-190°C, mold four 170-190°C, mold five 160-180°C.

9. The LVT floor production process according to claim 1, characterized in that: In step three, The speeds of the rollers are as follows: roller one 1100 rpm, roller two 1100 rpm, roller three 950 rpm, roller four 1000 rpm, roller five 1200 rpm; The temperatures of the rollers are as follows: roller one 130-150°C, roller two 140-160°C, roller three 140-160°C, roller four 140-160°C, roller five 140-160°C.

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