Chloe Zhang
You may have noticed clock-like symbols underneath plastic containers and wondered what they mean. These symbols are not related to the time of day but instead are used for quality control and to identify the mold used to form the container. They may also indicate the date of manufacture, allowing companies to trace quality issues to a specific date and material source.
| Characteristics | Values |
|---|---|
| Purpose | Record production run number for quality control |
| Date of manufacture | |
| Mold used to form the product | |
| Number of dials | Multiple dials in pairs (12 months, 10 years) |
| Single 12-number dial with a 2-digit | |
| Dial indicators | Year, Month, Week |
| Day, Month, Year | |
| Year, Month |
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What You'll Learn
The symbols indicate the date of manufacture
The clock-like symbols underneath plastic containers indicate the date of manufacture. These symbols are usually found on the bottom of plastic containers and consist of circles with numbers and an arrow pointing at one of the numbers. The upper dial denotes the year of manufacture, the middle dial indicates the month, and the bottom dial could be a mold identifier or a shift indicator.
These symbols are not always easy to interpret, and sometimes the bottom dial may be a week or day indicator, depending on the number of shifts in the factory. The clock-like symbols are a form of quality control, allowing factories to quickly identify and rectify any issues with a particular mold or production run.
While some sources suggest that these symbols are not related to dates, it is generally agreed that they do indicate a date of some sort, whether that be the date of manufacture or a date code for quality control purposes. These date codes can be used to identify and test other parts from the same batch if a failure occurs due to apparent material failure.
The clock-like symbols are a standardized form of marking plastic products, and while they may not be immediately understandable to consumers, they play an important role in quality control and product maintenance.
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They are used for quality control
Plastic containers often have circles with numbers and an arrow in the middle pointing at one of the numbers. These clock-like symbols are used for quality control and to identify the date and shift when the item was manufactured. The upper dial gives the year, the middle one the month, and the bottom indicator could be a mold identifier or shift indicator.
These symbols are important for quality control as they allow factories to quickly identify and maintain faulty products. If a problem is identified with a particular batch, the date markers can be used to track down that batch and perform additional testing. This helps to ensure that only high-quality products reach consumers and maintains the reputation of the manufacturer.
The bottom dial, or mold number, is especially useful for quality control. If a faulty product is noticed, the quality department can use the mold number to identify which mold was used and quickly track down other products made with the same mold. This allows them to either fix the mold or ensure that products made with it are not distributed.
Additionally, these clock-like symbols can also be used to identify the production run number. This information can be useful for tracking inventory and ensuring that products are distributed efficiently. By having a clear record of the production run, manufacturers can also identify any potential issues with specific runs and make the necessary improvements.
Overall, these clock-like symbols under plastic containers are an important tool for quality control and ensuring consumer safety. They provide valuable information about the manufacturing process and allow for quick identification and resolution of any issues.
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They are mould identifiers
The clock-like symbols underneath plastic containers are mould identifiers. These symbols are usually dials with numbers and an arrow pointing at one of the numbers. They indicate the mould used to form the container. This is important for quality control in factories. If a faulty product is noticed, the quality department can quickly identify which mould needs maintenance or further inspection.
These mould identifiers are often accompanied by dials indicating the date of manufacture. The upper dial usually represents the year, the middle one the month, and the bottom dial could be the week or day of manufacture. These date markers are useful for tracking down a specific batch if a problem arises.
While some sources suggest that the clock-like symbols are solely date-related, others confirm that they are indeed mould identifiers. It is possible that different industries or manufacturers use similar symbols for different purposes. In some cases, the clock-like symbols may serve a dual purpose, indicating both the mould number and a specific date or production run.
It is important to note that these symbols are a form of standardised plastic product marking. They are not intended to convey recycling information, plastic type, serial number, or food suitability. Instead, they primarily help manufacturers with quality control and batch identification.
So, the next time you see those clock-like symbols on a plastic container, remember that they are more than just decorations—they play a crucial role in ensuring product quality and consistency.
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They indicate the shift when the item was made
Plastic containers often have circles with numbers and an arrow in the middle pointing at one of the numbers. These clock-like symbols indicate the shift when the item was manufactured. The upper dial gives the year, the middle one the month, and the bottom indicator could be a shift or mould identifier. This is used for quality control, allowing factories to quickly identify which moulds need maintenance if a faulty product is found.
These clock-like symbols are not always related to dates. They are a standardised plastic product marking, used for quality control. If a part with a certain date code fails, manufacturers can find other parts with the same date code and conduct further testing.
The clock-like symbols are usually found on plastic containers, but they can also be found on various other plastic products, such as computer hardware and automotive parts. The symbols are moulded into the plastic and can be difficult to read, but sometimes numbers are moulded clearly around them.
While the upper two dials are typically date-related, indicating the year and month of manufacture, the bottom dial could indicate the week or day of manufacture. This allows manufacturers to quickly identify when a product was made and track down any potential issues with a specific batch.
These clock symbols are an important tool for quality control, helping manufacturers identify and address any issues with their products in a timely and efficient manner.
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They are standardised plastic product markings
The clock-like symbols underneath plastic containers are standardised plastic product markings. These markings are usually moulded into the plastic and consist of dials with numbers and an arrow pointing to a particular number.
These markings are related to quality control and indicate the date of manufacture. The upper dial represents the year, the middle one the month, and the bottom dial could be a mould identifier or a shift indicator. These markings allow factories to quickly identify which moulds may need maintenance if a faulty product is found.
Some sources suggest that the bottom dial could represent the week of manufacture, with the top and middle dials representing the year and month, respectively. This allows for further specificity in identifying batches in the event of a problem.
While these markings are commonly associated with date information, there may be variations where the dials do not represent a date, but rather some other form of standardised plastic product marking.
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Frequently asked questions
The clock-like symbols indicate the date of manufacture.
The upper dial likely represents the year, the middle one the month, and the bottom one could be a mold identifier.
These symbols are used for quality control. If a faulty product is found, the batch can be identified and investigated.
No, these symbols are not related to recycling. They are related to production information.
No, these symbols are also found on various other plastic products, including computer parts and automotive parts.
