What the data for this category looks like
Data sources for the chemical fiber category mainly cover upstream raw material market trends of the petrochemical industry chain, midstream production process parameters, downstream application demand reports, and customs import and export details. Update rhythms vary significantly: raw material futures market trends are updated daily, industry supply and demand reports are mostly released monthly, and corporate annual production reports are updated annually. Document structures primarily use structured tables, including process parameters such as degree of polymerization, fineness, and breaking strength. They are interspersed with price trend line charts and supply and demand balance sheets. Field units mostly use industry-specific units such as denier (D), centinewtons per tex (cN/dtex), and tons.
What constraints do these characteristics place on the document parsing and chunking workflow
The varied update rhythms of multiple data sources require parsing tasks to adapt to batch processing of documents with different frequencies, to avoid parsing timeouts for short-cycle market-related documents. Structured tables account for a large proportion of documents and include specialized units. General-purpose parsing tools are prone to issues such as misaligned table cells and incorrect unit recognition, so targeted adjustments to the table splitting logic of parsing are needed. Field names for industry-specific parameters differ from general terminology. Complete parameter identification must be retained during chunking to avoid losing key context after splitting. Chunking long documents requires balancing the relevance between process parameter tables and text descriptions, to prevent key process logic from being split across chunks.
How to configure the settings
| Configuration Item | Recommended Value | Rationale |
|---|---|---|
PARSE_FILE_TIMEOUT_SECONDS | 600 seconds | Chemical fiber industry documents often include multi-page large supply and demand balance sheets, requiring sufficient time to complete full parsing |
chunk_size | 800–1200 characters | Balances the integrity of process parameter tables and the contextual coherence of text descriptions, avoiding splitting key parameters across chunks |
chunk_overlap | 100–150 characters | Retains the connection between process parameters and preceding or following text descriptions, preventing context loss during retrieval |
PDF_PARSE_TABLE_MODE | fixed | Most tables in chemical fiber documents use fixed formats, and the fixed mode reduces cell misalignment issues |
UPLOAD_FILE_MAX_SIZE | 200 MB | Some annual industry report PDF files have large file sizes, requiring adaptation to batch upload requirements |
CUSTOM_PARSE_SERVICE_URL | Fill in according to the actual address of the self-built service | Adapts to the specialized parsing needs of chemical fiber documents, replacing general-purpose parsing to improve table recognition accuracy |
The parameter values provided on this page are all conventional recommendations used as a starting point for configuration. Actual values are affected by material form, data volume, and business rules. Specific issues require specific analysis, and it is recommended to test on your own samples before finalizing settings.
Three common configuration mistakes
- Symptom: Rows and columns of parsed tables are misaligned, and field correspondence is chaotic after uploading a PDF file. Cause:
PDF_PARSE_TABLE_MODEis not set tofixed, and the default streaming parsing mode cannot adapt to the fixed-format tables in chemical fiber documents. - Symptom: The intelligent agent API returns a
504 Gateway Timeoutstatus code after uploading a file, and the parsing task fails. Cause: ThePARSE_FILE_TIMEOUT_SECONDSparameter is not adjusted, and the default timeout duration is insufficient to complete parsing of large chemical fiber industry reports. - Symptom: The custom PDF parsing service is not triggered, and the platform's default parsing logic is still used. Cause: The custom parsing function is not enabled in the knowledge base settings, or the interface address configured in
CUSTOM_PARSE_SERVICE_URLcannot be accessed normally.
How to verify successful configuration
- Upload a chemical fiber industry PDF document containing a large supply and demand balance sheet, and check whether the parsed table maintains row and column alignment without misalignment.
- View the
PARSE_FILE_TIMEOUT_SECONDSparameter value in the knowledge base settings to confirm that it adapts to the parsing duration requirements of the current document. - Call the intelligent agent API to upload a test file, and check whether the returned parsing result includes complete process parameter fields and corresponding units.
- Confirm that the current FastGPT version is 4.8.20-fix2 or later to support full configuration of the
PDF_PARSE_TABLE_MODEparameter. - Check the interface logs of the custom parsing service to confirm that the platform has sent parsing requests to the configured
CUSTOM_PARSE_SERVICE_URL.
Question material comes from public community discussions. Configuration values are common starting points and should be measured against your own samples. Verified on 2026-09-14.