A rough surface color coated steel sheet film pasting method

Abstract

The application discloses a rough surface color-coated steel plate film pasting method. The method comprises the following steps: step S101, protective film matching; and step S102, film coating process, the process flow is as follows: 1) first online: winding-up→ unwinding→ splicing→ pre-washing→ straightening→ washing→ primer→ drying→ initial topcoat→ drying→ cooling→ finishing topcoat→ drying→ cooling→ online inspection→ winding; 2) second online: winding-up→ unwinding→ splicing→ pre-washing off→ straightening on→ washing off→ passivation coating head on→ drying→ initial primer coating head on→ drying→ cooling→ finishing topcoat coating head on→ drying→ cooling→ film coating→ online inspection→ winding. The method effectively solves the problems that ordinary protective film cannot be normally adhered and is easy to fall off after being adhered due to large surface roughness in the production process of special surface color-coated plates such as wrinkle, scratch resistance, suede and net texture.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of steel plate protective film, more particularly, to a rough surface color coated steel plate film pasting method. BACKGROUND

[0002] Color coated steel plate is widely used in the construction, household appliances, packaging and other industries, the existing color coated steel plate production process, after the galvanized substrate degreasing, passivation, initial coating, using precision coating to coat the finish. In order to avoid the color coated steel plate in the process of transportation due to collision, stacking, friction, static shock and damage to the coating, most of the household appliances color coated products are pasted with protective film before the line to protect. For example, the patent with the patent application number 201520985332.X discloses a film coated color steel plate, which comprises a steel plate substrate and a topcoat layer coated on the steel plate substrate, and a film is fused and pressed on the topcoat layer, the film is provided with a hot melt adhesive resin coating, an adhesive layer and a PET layer from inside to outside; the hot melt adhesive resin coating is adhered to the PET layer through the adhesive layer.

[0003] In addition, in the color coated steel plate film pasting, the corresponding film pasting process also discloses part of the content, for example, the patent with the patent application number 201310055605.6 discloses a preparation method of cold film pasting color coated plate, which adopts the following process flow: base plate unwinding→base plate pretreatment→base plate back coating→base plate front surface pasting color film→front surface covering protective film winding; again, the patent with the patent application number 201410070748.9 discloses a production method of embossed PET combined color steel plate, and the basic process flow is as follows: base plate unwinding→base plate pretreatment→steel plate back coating→steel plate front surface coating→steel plate front surface film covering→front surface covering protective film winding.

[0004] However, for the rough surface color coated steel plate, such as the special effect of the plate surface, under normal process conditions, the protective film cannot be firmly adhered to the plate surface, and the protective film is prone to bulging and falling off. SUMMARY

[0005] 1. Problem to be solved

[0006] In view of the problem that the protective film of the color coated plate with rough surface such as wrinkle, scratch resistance, suede and mesh is easy to fall off after being adhered, the present application provides a rough surface color coated steel plate film pasting method, which can firmly adhere the protective film and prevent it from falling off.

[0007] 2. Technical scheme

[0008] In order to solve the above problems, the technical scheme adopted by the present application is as follows:

[0009] The rough surface color coated steel plate film pasting method of the present application, the surface roughness of the color coated plate is 1.5-55, comprising the following steps:

[0010] Step S101, protective film matching

[0011] Table 1 protective film selection

[0012]

[0013]

[0014] The polyethylene plastic film has good physical and mechanical properties, and has excellent performance in flexibility and extensibility.

[0015] The water-based emulsion type acrylic pressure-sensitive adhesive (referred to as water-based acrylic) glue system is synthesized by free radical emulsion polymerization of acrylic ester monomers. The main advantages of the water-based emulsion type acrylic pressure-sensitive adhesive glue are: low cost, no harm, environmentally friendly; the preparation method of the polymer is simple, and the reaction time is not long; it is convenient to obtain a low viscosity polymer pressure-sensitive adhesive with high concentration and high molecular weight.

[0016] Preferably, the protective film is a low crystal point protective film. Smaller crystal points can make the film bubble not easy to break, and the production stability is good. The low crystal point is not easy to cause film indentation defects, and the crystal point size is preferably 0.02mm≤ crystal point size≤0.5mm, and the number of crystal points is≤5 per square meter.

[0017] Step S102, film coating process optimization

[0018] The present application mainly adopts the secondary online cold film hot pasting process, and the specific process flow is as follows:

[0019] 1) First online: winding→ unwinding→ sewing→ pre-washing→ straightening→ washing→ primer→ drying→ initial topcoat→ drying→ cooling→ fine topcoat→ drying→ cooling→ online inspection→ winding;

[0020] 2) Second online: winding→ unwinding→ sewing→ pre-washing closed (squeeze dry roller open, air knife open)→ straightening open→ washing closed (squeeze dry roller open, air knife open)→ passivation coating head open→ drying→ initial bottom coating coating head open→ drying→ cooling→ fine topcoat coating head open→ drying→ cooling→ film coating→ online inspection→ winding.

[0021] The specific process of the second online is:

[0022] 1) Optimize the tension of the whole line

[0023] Table 2 process parameters

[0024]

[0025] 2) Stop the chemical coating machine, and stop the chemical coating machine belt roller and coating roller to prevent the passivation liquid from splashing to the product surface through the rotation of the belt roller and the coating roller, and set the chemical coating section furnace temperature.

[0026] Table 3 Coating section furnace temperature

[0027] Furnace temperature setting Coating PMT Furnace temperature (°C) 60-80 40-50

[0028] 3) The furnace temperature is lowered, and the initial coating furnace temperature is set to 80-100℃, and the finishing coating furnace temperature is set to 80-120℃.

[0029] Table 4 Curing section furnace temperature

[0030] Furnace temperature setting 1st stage 2nd stage 3rd stage 4th stage 5th stage PMT Initial coating furnace temperature (°C) 80-100 80-100 80-100 80-100 80-100 50-60 Finishing coating furnace temperature (°C) 80-120 80-120 80-120 80-120 80-120 60-80

[0031] 4) The finishing coating water quenching spray and mist are optimized

[0032] Table 5 Water quenching control

[0033] / Initial coating water cooling Finishing coating water cooling Cooling effect Scheme 100% open 40-60% open No backflow plate type is better

[0034] The on-off of the cooling water is performed according to the above operation, and the water treatment is checked for the production line water supply pressure, so that the water treatment can adjust the water pressure to 2-4KG; in production, the water of the finishing coating water quenching cannot flow back to the hot film sticking machine along the surface of the steel strip, and the angle of the spray pipe is adjusted to 50-70° with the steel strip.

[0035] 5) The film guide adjustment knob of the hot film operation panel is used to adjust the edge of the operation side and the transmission side (the film guide adjustment time is 1 second, and the adjustment is 3mm).

[0036] Table 6 Film covering tension control

[0037] Production stage Initial stage Transition stage Stable stage Tension setting / KN 1.5-2.5 0.6-1.0 0.3-0.6

[0038] 3. Beneficial effects

[0039] Compared with the prior art, the beneficial effects of the present application are:

[0040] (1) The rough surface color coated steel plate film sticking method of the present application effectively solves the problems that ordinary protective films cannot be normally adhered and are easily peeled off after being adhered due to the large surface roughness in the production process of special plate surface color coated plates such as wrinkle, scratch resistance, suede, and mesh;

[0041] (2) The rough surface color coated steel plate film sticking method of the present application, the rough surface color coated plate is prone to collapse during winding, especially after sticking the protective film on the smooth surface, the friction between the surfaces is greatly reduced, which is more prone to slipping and collapse, the present application effectively solves the problem of film collapse by adjusting the tension of the whole line, especially the winding process. BRIEF DESCRIPTION OF DRAWINGS

[0042] The technical solutions of the present application will be further described in detail below in combination with the drawings and examples, but it should be understood that these drawings are designed only for the purpose of explanation, and therefore do not limit the scope of the present application. In addition, unless specifically indicated, these drawings are only intended to conceptually illustrate the structural configuration described herein, and are not necessarily drawn to scale.

[0043] Figure 1 Structure diagram of the existing technology process for attaching the raised color coated steel plate;

[0044] Figure 2 Structure diagram of the color coated steel plate for the film attaching method of the rough surface color coated steel plate of the present application. DETAILED DESCRIPTION

[0045] The following detailed description of exemplary embodiments of the present application refers to the accompanying drawings that form a part of this description, in which are shown, by way of example, exemplary embodiments in which the present application can be practiced. Although these exemplary embodiments are described in sufficient detail to enable those skilled in the art to practice the application, it is understood that other embodiments can be used and that

[0046] Example 1

[0047] The film attaching method of the rough surface color coated steel plate of the present embodiment, wherein the equipment used is the equipment of the prior art, such as the equipment disclosed in patent 201310055605.6, the present application mainly adopts the secondary online cold film hot attaching process, and the specific process flow is as follows:

[0048] Secondary online: winding up→ unwinding→ sewing→ pre-washing closed (squeeze dry roller open, air knife open)→ straightening open→ washing closed (squeeze dry roller open, air knife open)→ passivation coating head open→ drying→ initial coating primer coating head open→ drying→ cooling→ finishing coating topcoat coating head open→ drying→ cooling→ film covering→ online inspection→ winding. The protective film and process parameters used in this process flow are shown in Table 7 and Table 8.

[0049] Example 2

[0050] The steps of the present embodiment are basically the same as those of example 1, except that the parameters are different. The protective film and process parameters used in this process flow are shown in Table 7 and Table 8.

[0051] Example 3

[0052] The embodiment is basically consistent with the steps of embodiment 1, and the difference is that the selection of parameters is different. The protective film and process parameters used in the process are shown in table 7 and table 8.

[0053] Table 7 protective film selection of example 1-3

[0054]

[0055] Table 8 production process parameters of example 1-3

[0056] Item Example 1 Example 2 Example 3 Exit loop tension / KN 8 10 12 Initial coating furnace tension / KN 35 38 32 Finishing coating furnace tension / KN 46 42 45 Coiling tension / KN 24 25 26 Initial (finishing) coating sag cm 0 10 25 Coating PMT 45 42 47 Initial coating PMT 58 56 51 Finishing coating PMT 65 72 75 Initial coating water cooling open state 100% open 100% open 100% open Finishing coating water cooling open state 46% open 51% open 55% open Initial stage film tension / KN 1.9 2.1 2.4 Transition stage film tension / KN 0.6 0.8 1.0 Stable stage film tension / KN 0.4 0.5 0.6

[0057] It can be seen from the above examples 1-3 that the rough surface color coating product cold film hot sticking process operation method of the application solves the problems that ordinary protective film cannot be firmly adhered to the plate surface under normal process conditions and is easy to collapse during winding, and has good popularization and application value.

Claims

1. A method for applying film to rough-surfaced color-coated steel sheets, characterized in that, Includes the following steps: Step S101, Protective film matching The requirements for selecting protective films are as follows: Transparent color; The protective film is made of polyethylene. Water-based emulsion acrylic pressure-sensitive adhesive; Crystal point requirements: 0.02mm~0.5mm, number of crystal points ≤5 / square meter; The protective film thickness is 40-60 micrometers; Protective film peel strength: 0.3-1.5 N / cm; The tensile strength of the protective film is ≥10MPa; Elongation ≥ 100%; Step S102, Coating process The process flow is as follows: 1) One-time production line: Unwinding → Sewing → Pre-cleaning → Straightening → Cleaning → Primer → Drying → Initial topcoat application → Drying → Cooling → Fine topcoat application → Drying → Cooling → Online inspection → Winding up; 2) Secondary production line: Unwinding → Sewing → Pre-cleaning and closing → Straightening and opening → Cleaning and closing → Passivation coating head opening → Drying → Initial primer coating head opening → Drying → Cooling → Fine topcoat coating head opening → Drying → Cooling → Lamination → Online inspection → Rewinding.

2. The method for applying film to rough-surfaced color-coated steel sheets according to claim 1, characterized in that, Specific process parameter settings for the second production run: 1) The tension settings for the entire production line are as follows: 2) Set the furnace temperature for the chemical coating section: 3) Set the initial coating oven temperature to 80-100℃ and the finishing coating oven temperature to 80-120℃. The specific curing section oven temperatures are as follows: 4) Water cooling on: 5) Film tension control: 。

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