Bubbles, needle holes, sticky hair and delayered check

Bubbles and needle holes

Bubbles are often associated with substrate dampness, pore exhausts, solar warming, mixing of curly gas, or single-channel thickness; The needle hole may also come from a lack of containment in the primmer. The origin level of the bubble should be judged by the opening of defects.

Peaks and surface pollution

Oil pollution, silicon contamination, dust and tool residues cause local surface tension anomalies. Work on return should be expanded to cover cleaning and grinding, and the surface of defects should not be covered by new materials alone.

Tackiness and failure to cure

Priority is given to the verification of A/B matching, statistical records, hybrid homogeneity, material temperature, construction environment and batches of products. Blends that are thickened or above pot life may not continue to be used by water or by any solvent.

Skinning and decorating

Check substrate strength, water-bearing state, prmer matching and interstory recoat window. The restoration must be managed to a solid interface, which is then re-established at a supporting level and accompanied by validation.

Create diagnostic pathways with defective features

The diagnosis of defects begins with a record of “when, where, at which level and how”. (a) A high-intensity bubble immediately present in the construction process, often associated with the mixing of balloons, substrate exhausts or high temperatures; (a) Bumps that appear after curing in the solar area may be associated with vapour pressure; Only detachments that occur on the sides should be checked for recoat window and contamination. Evidentiary chains based on photographs, area maps, material batch numbers, feed times, humidity and substrate state are more reliable than direct empirical attribution. When necessary, the defects are observed in the source layer and internal state.

The needle holes, constrictors and bubbles look similar but different. The needle hole may have escaped the gas without leaving, the condensed hole may have been caused by oil, silicon or surface tension, and the bubble may have retained the complete bubble wall. The inspection was conducted to observe size, edge, internal moisture or contamination and corresponded to the direction of construction, the drums and the substrate patch. Do not “cover” the surface of the defect directly, and the new layer may reproduce the problem again and even seal the water vapours and unsolidated compounds inside.

Fabrication, environmental and construction factors

Sticky or softened first check A/B scale, scales, pre-blended mix, mixing time and sound corner of barrel. Different components appear to be mixed and do not amount to the correct reaction ratio, and artificial volume measurement is particularly prone to deviations. The material above the pot life will grow thicker and lose valueless and cannot be added to water or solvent recovery. Low temperatures, excessive temperature differentials and local mixing also lead to curing differences. The issue is whether a single barrel, a single batch or a systemic anomaly is to be determined by maintaining a record of the volume per barrel and the construction area.

In the environment, both air temperature, substrate temperature, humidity, dew point differential, wind and solar warming are considered. The sudden heating of cold substrate areas accelerates the pore venting, and cooling at night can lead to exposure; High wind speeds render the surface too fast to dissolve or bring in dust. One-way too thick, repeatedly rolling, high-speed mixing and water-bearing tools can also cause defects. The roller, carving and monoway usage are determined in small samples prior to construction and should be discontinued and new materials replaced in the event of a significant change in the material ' s state during the process.

Principles of restoration and prevention of closed loops

The repair should extend beyond visible defects in the naked eye until a firm, dry and clean border is found. Unresolved materials are completely removed, contaminated surfaces are cleaned using compatible methods, remechanical grinding and vacuuming. Local deep pits are patched by layer to avoid a stack; Composed edge plume into a smooth tie. If the substrate return or structural cracks are still active, the problems of water supply and migration should be addressed first. Following the completion of the repairs, the original acceptance project was reviewed and could not be qualified solely by colour cover.

Prevention closed loops include the conversion of the cause of defects into an on-site inspection item. For example, substrate vents lead to needle holes, increasing containment timetime control; The matching results in adhesiveness, calibration of scales and double review; The pollution between layers results in de-scrambles, where area time plates and pre-paint checks are set. The class should end up showing a genuine sample of acceptable and unacceptable conditions. The risk of duplication in equipment, materials or processes can be identified for ongoing statistical deficiencies of type and area where they occur.

Project landing and risk review

Prior to formal entry, the project leader shall organize a review of the design, materials, construction and user's common completion conditions and convert the drawing requirements into an on-site list of enforceable areas. The list contains, at a minimum, the type and state of the base materials, the target level and film thickness, the location of nodes, batches of materials, single batches, construction tools, division of labour, environmental control, repainting time and conditions of openness. Synchronization of cross-operations, temporary power, ventilation, fire protection and product protection to avoid interference with welding, cutting, dusting or installation of equipment. Following the completion of the first area of operation, a team self-check and technical review was conducted to compare actual usage, solidity and sample results and to confirm that there were no systemic deviations that could be carried out successively.

Quality management should have suspended inspection nodes instead of waiting for full coverage of the latter acceptance. The photographs and data are checked and stored before the substrate processes are completed, the Primer closures are closed, the defects are fixed, the key nodes are enhanced and the topcoat is delivered. In the event of an abnormal state of material, transboundary environment, batch changes or large area defects, the area shall be immediately isolated, samples and records maintained and the disposal method determined by the technicians. Any return to work will be accompanied by a breakdown interface, scope of processing, application of materials and results. The transformation of laboratory performance from stable to long-term use at the engineering site is achieved through piloting, process testimony, data marks and closed loop re-examination.