In the entire life cycle of production, storage and use of Aerosol Tin Can, inner coating peeling is the core quality hazard second only to weld leakage. Especially in industries with high requirements for can body protection such as food, medicine and chemical industry, inner coating peeling not only affects the service life of the can body, but also may lead to content contamination, can body corrosion and even safety accidents. Many enterprises only focus on the appearance and weld quality of the can body during production, ignoring the construction and control of the inner coating, resulting in batch cans having problems such as wrinkling, peeling and dissolving of the inner coating. This not only causes loss of raw materials, but also may lead to complaints from downstream customers and affect the enterprise's brand reputation. In fact, the inner coating of Aerosol Tin Can is a "protective barrier" between the can body and the contents. Its adhesion and stability directly determine the safety and service life of the can body. It is necessary to focus on controlling the key links of the entire production process to eliminate the hidden danger of inner coating peeling.
Inner coating peeling is not an accidental phenomenon, and its causes are closely related to many factors such as raw material quality, construction process and storage environment. Based on SAILON's years of production experience and industry case summary, the core causes of inner coating peeling have obvious industry commonalities, and the corresponding production performance and long-term hazards of different causes are also different. To help enterprises accurately troubleshoot hidden dangers and quickly solve problems, we have sorted out a detailed cause analysis table for enterprises' reference:
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Core Causes of Peeling
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Typical Performances in Production
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Long-Term Hazards
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Improper selection of inner coating materials
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Chemical reaction occurs between the coating and the contents, resulting in dissolution, discoloration and wrinkling. Peeling problems break out intensively during mass production, and most of them occur at the bottom of the inner wall of the can body
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The contents are contaminated by coating impurities and cannot be used normally. If they are food or medical products, they may also cause safety and compliance risks, leading to product recall
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Incomplete surface treatment of can body base material
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There are oil stains, oxide layers and impurities on the surface of the base material, the coating adhesion is poor, it can be peeled off with a light scratch by hand, and the coating peeling phenomenon in the weld area is particularly obvious
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The can body base material is in direct contact with the contents, causing corrosion and rust, leading to can body damage, content leakage and shortening the service life of the can body
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Non-standard coating construction process
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The coating thickness is uneven, some areas are missing or thinly coated, the baking temperature is too high or too low, leading to insufficient curing of the coating, resulting in cracking and peeling
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During storage and transportation of the can body, the coating is easy to peel off due to collision and friction, increasing the proportion of unqualified products and raising the enterprise's production costs
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Inappropriate storage environment
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The can body storage environment is humid and the temperature is too high, the coating appears damp and soft, and large-area peeling occurs after long-term storage
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Batch cans are scrapped, causing serious loss of raw materials and production costs, affecting the enterprise's production progress and delivery cycle
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Among the above causes, improper selection of inner coating materials and incomplete surface treatment of base materials are the two most common incentives, accounting for more than 70%. Many enterprises choose general-purpose inner coating materials to reduce production costs, without targeted selection according to the characteristics of the contents. For example, ordinary coatings are used for chemical contents with strong corrosion or for food-grade cans, leading to reactions between the coating and the contents and rapid peeling; at the same time, some enterprises omit pre-treatment links such as degreasing, derusting and passivation of the base material surface, and directly carry out coating construction, resulting in the coating cannot be closely combined with the base material, leading to peeling hidden dangers.
As a professional Aerosol Tin Can manufacturer focusing on the production of custom Aerosol Tin Can, SAILON has built a full-process solution for inner coating peeling, avoiding hidden dangers from the source and ensuring stable can body quality: first, accurately select inner coating materials, customize suitable special coatings according to the characteristics of customers' contents (oily, water-based, corrosive, etc.), select food-contact epoxy phenolic coatings for food-grade cans, and corrosion-resistant special coatings for chemical cans to ensure that the coating does not react with the contents; second, improve the base material surface pre-treatment process, adopt chromium-free passivation technology to degrease, derust and passivate the base material, improve coating adhesion, and eliminate peeling problems caused by surface impurities; third, standardize the coating construction and curing process, adopt automatic spraying equipment to accurately control the coating thickness, optimize the baking temperature and time to ensure sufficient curing of the coating, and establish a detection mechanism for coating thickness and curing effect. Each batch of products undergoes strict detection to ensure that the coating quality meets the standard.
Frequently Asked Questions (FAQ)
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Q: Can inner coating peeling be found in advance with the naked eye? A: Some can be found, but hidden peeling is difficult to identify. Obvious wrinkles and large-area peeling can be observed with the naked eye, but hidden hidden dangers such as tiny peeling and separation between the coating and the base material can only be accurately checked with professional detection equipment (such as coating adhesion tester). Each batch of cans of SAILON undergoes coating adhesion detection to ensure that the coating is firm and eliminate hidden peeling hazards.
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Q: Are there clear industry standard requirements for the inner coating of food-grade Aerosol Tin Can? A: There are clear standard requirements. The inner coating of food-grade cans must comply with the national GB/T 13042-2008 "Packaging Containers - Aerosol Cans" and GB 4806.1-2016 "General Safety Requirements for Plastic Materials and Products in Contact with Food", and must have the characteristics of safety, non-toxicity, no odor, no heavy metal precipitation, and corrosion resistance to food media. The food-grade inner coating of SAILON has passed third-party testing, fully complying with industry standards, and can be safely used for food packaging.
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Q: How to avoid inner coating peeling during storage? A: The core is to control the storage environment. It is recommended to store the cans in a dry, ventilated and cool warehouse, avoid humidity, high temperature and direct sunlight, and avoid stacking the cans too high to prevent the bottom cans from being pressed and collided, leading to coating peeling; in addition, the cans must ensure that the coating is completely cured before storage, to avoid the uncured coating contacting the humid environment and causing softening and peeling. SAILON can provide professional guidance on can storage to help customers avoid quality hazards during storage.
In summary, the inner coating peeling of Aerosol Tin Can is a preventable and controllable quality problem. The core lies in accurately selecting coating materials, standardizing the production process and controlling the storage environment. Enterprises need to abandon the production concept of "valuing appearance over inner quality", pay attention to the quality control of the inner coating, and strictly follow industry standards in every link from raw material selection, base material pre-treatment to coating construction and finished product testing, so as to eliminate the hidden danger of inner coating peeling. With a professional technical team and a complete production control system, SAILON can provide customized inner coating solutions for customers in different industries, helping enterprises solve the pain point of inner coating peeling and improve product quality and market competitiveness.