Preparation of backsheet, EVA, separator
The operating procedures in this article take manual operation as an example.
1. Purpose
According to the requirements of the drawing, cut the backboard, EVA and separator of the specified size and quantity.
2. Bill of Materials
① Backplane (Specification: 810mm x 1585mm).
② EVA (specification: 810mm x 1585 mm).
③ PVC gloves.
3. Proper craftsmanship
① Use a steel ruler to measure the length and width of the backboard and EVA, respectively, so that the length and width are basically vertical, and then fix it with a steel ruler or special tools.
② Use a utility knife to cut the back panel and EVA against the edge of a steel ruler or special tool.
③ The cut back plate and EVA are neatly stacked. If the backplane and EVA are cut from large-sized materials, they need to be cut in strict accordance with the process requirements to reduce material loss.
④ After the operation, self-inspection is carried out, and the semi-finished products that meet the quality requirements can enter the next process.
⑤ Determine the size of the backplane and EVA according to the tempered glass required by the component design. The length and width of the backplane and EVA are required to be increased (25) mm + 5mm (under normal conditions, due to the heat shrinkage of the material) than the glass size. The length direction needs to be extended a little more). The example requirements are as follows:
Backplane: length 1585mm + 5mm, width 810mm + 5mm, as shown in Figure 1.
EVA: length 1585mm + 5mm, width 810mm + 5mm.
TPT Separator: See Figure 2 for dimensions.
EVA pad: length 640mm, width 60mm.
4. Equipment and Tools
① Backboard/EVA cutting table.
② utility knife.
③ Steel ruler.
④ Turnover car.
5. Quality requirements
① The length and width dimension deviation of the backplane and EVA is not allowed to exceed the requirements of the process drawing.
② The backboard and EVA shall not have obvious creases, and the cross section shall be straight, smooth and tidy.
③ The back plate and EVA shall not have stains, protrusions, etc.
6. Notes
① The utility knife is very sharp and should be handled with caution to avoid scratching yourself or others.
② In the process of cutting, if there is a large area of quality problems in the material, the operation should be stopped, and the quality management personnel (IPQC) should be contacted to confirm the treatment plan.
Ribbon preparation
1. Purpose
In the example of the article on this site, it is necessary to prepare two kinds of welding strips of 1. 5mm x 0. 15mm and 5mm x 0. 2mm.
2. Bill of Materials
① Flux.
② Wrapping paper (can choose waste paper for wrapping tempered glass).
3. Equipment and Tools
① Belt cutting machine.
② Heat gun.
③ Tweezers.
④ Storage box.
4. Process requirements
① Use a tape cutting machine to cut welding tapes with a size of 1.5mm x 0.15mm, and the number is as follows: 132 pieces with a length of 220mm; a total of 24 pieces with a length of 160mm.
② Use a tape cutting machine to cut welding tapes with a specification of 5mm x 0.2mm, and the number is as follows: 220mm long, 3 pieces, 195mm long, 3 pieces, 330mm long, 2 pieces, and 75mm long, 4 pieces.
③ Soak the tin-coated tape in the flux for at least 5 minutes, take it out and filter it on a filter screen, dry it with a hot air gun, and pack it with wrapping paper. Pay attention to soaking the welding strips of different lengths separately, and make identification and statistics. (The ideal method is to dry naturally, but usually affects productivity.)
④ After the above operations are completed, it is necessary to accurately record the corresponding data.
5. Quality requirements
① Whether it is self-cutting or directly purchasing the cut ribbon, there should be no copper leakage, tin removal, black spots, rust, cracks, scars, tin nodules, burrs, etc.
② The surface should be smooth and uniform in color.
③ The flux is soaked evenly and fully covered.
④ All welding strips must be kept flat, the incision is straight, and there must be no deformation such as bending or twisting.
⑤ The size error is less than ±2mm or according to the requirements of the craft drawing.
⑥ All prepared materials should be wrapped in wrapping paper, and direct contact with hands is strictly prohibited.
6. Precautions
① Welding strips of various lengths (interconnecting bars, bus bars) should be placed separately, and the specifications, dimensions, quantities, and names must be indicated on the packaging paper, and beware of mixing.
② Check the welding tape for blackening or copper leakage, and select the unqualified ones and hand them over to the process team leader for processing.
③ If a large number of abnormal conditions are found, the IPQC of the Quality Department and the on-site technicians should be notified immediately.