What the data for this category looks like
This category covers coating line operations for automotive, home appliance, engineering machinery, and metal furniture. Daily documents include coating process cards, paint batch sheets, paint mixing records, film thickness and color difference reports, oven curves, defect repair orders, and VOCs ledgers. Data sources include paint supplier TDS/SDS, spray booth and oven operating data, colorimeter and film thickness gauge test data, environmental monitoring records, and MES systems. Documents are updated per paint batch, per shift output, and for continuously collected real-time operating data. Documents include numerical fields with units, such as μm for film thickness and seconds for viscosity. Some documents include structured tables and line charts.
What constraints these characteristics impose on the document parsing and chunking workflow
Multiple document types and real-time updated data require parsing tools to support text, tables, line charts, and other formats, to avoid losing field associations. Numerical fields with units must retain complete parameters and corresponding identifiers during chunking. Otherwise, defect causes and process parameters cannot be matched during retrieval. Continuously collected oven curves and process cards must cover complete time or process segments. Chunk length should not be too short, as this will break the coherence of process logic. Compliance-related VOCs ledgers must retain individual entries in full, and critical information must not be truncated by automatic chunking.
How to configure the settings
The following configurations apply to FastGPT v4.17.0
| Configuration Item | Recommended Setting | Rationale |
|---|---|---|
chunkSize | 800–1200 characters | Adapts to documents such as coating process cards and oven curves, covers complete process segments or single-batch data, and avoids truncating the association between key parameters |
chunkSplitter | Split by paragraph + table | Adapts to documents with multi-column tables such as paint mixing records and film thickness reports, retains the correspondence between fields and values within cells |
customPdfParse | Enable structured parsing | Extracts chart and table data from oven curves and defect repair orders, avoids losing the correspondence between coordinates and values from plain text parsing |
PARSE_FILE_TIMEOUT_SECONDS | 120 seconds | Adapts to large coating process documents or batch-imported batch sheets, prevents task interruptions caused by excessively long parsing times |
chunkSettingMode | Manual mode | For compliance documents such as VOCs ledgers, custom chunk boundaries can be set to ensure that individual ledger entries are retained in full |
Three common misconfigurations
- After uploading a multi-column paint mixing record Excel file, the parsed text chunks are split chaotically. Individual paint ratio and viscosity test data are split across different chunks, making corresponding relationships unmatchable during retrieval. The cause is failing to set
chunkSplitterto split by paragraph + table. The default chunking logic only splits by line breaks, and does not recognize the cell structure of tables. - When uploading a single oven curve PDF document with a duration longer than 30 minutes, the interface displays a parsing timeout and returns a 504 status code. The cause is failing to adjust
PARSE_FILE_TIMEOUT_SECONDSto 120 seconds. The default timeout duration is insufficient for parsing long-duration curve documents. - After uploading a VOCs ledger PDF, only partial entry content is returned during retrieval, and complete ledger numbers and emission data cannot be obtained. The cause is failing to switch
chunkSettingModeto manual mode. The automatic chunking logic does not recognize the entry boundaries of the ledger, resulting in individual compliance entries being truncated.
How to confirm configurations are correctly set
- Upload a coating process card PDF, view the parsed text chunks, and confirm that associated fields such as process parameters and batch numbers are not split across chunks.
- Upload a single oven curve document, check that the parsing duration matches the
PARSE_FILE_TIMEOUT_SECONDSsetting, and no timeout errors occur. - Import a multi-column paint mixing record Excel file, confirm that complete column fields and corresponding values are retained within each parsed chunk.
- Test retrieval of an individual entry from the VOCs ledger, confirm that complete ledger content is returned without truncation.
The values provided are common starting points and should be measured against the reader's own samples.