# Resin Lot and Dryer Log Worksheet > Source: https://netray.co/tools/resin-lot-and-dryer-log-worksheet > Publisher: Netray (netray.co), AI and integration engineering for ERP and manufacturing systems. > Section: Free Tools ## Short answer Record resin lots, dryer settings and drying hours, and see at a glance which lots were under dried. ## Category quality ## Industry Plastics and Injection Molding ## Audience - Material handler - Process technician - Quality engineer ## Tool **Kind:** worksheet **Mode:** editable **Columns:** #### Date **Key:** date **Type:** date #### Resin lot **Key:** lot **Type:** text #### Resin and grade **Key:** resin **Type:** text #### Dryer **Key:** dryer **Type:** text #### Dry temp **Key:** temp **Type:** number **Unit:** C #### Dew point **Key:** dew **Type:** number **Unit:** C #### Hours dried **Key:** actual **Type:** number **Unit:** h #### Hours required **Key:** required **Type:** number **Unit:** h #### Margin **Key:** margin **Type:** number **Expr:** actual - required **Format:** hours #### Regrind share **Key:** regrind **Type:** number **Unit:** % #### Quantity loaded **Key:** kg **Type:** number **Unit:** kg **Rows:** **Date:** 2026-10-12 **Lot:** 24B1187 **Resin:** PA66 GF30 **Dryer:** D2 **Temp:** 80 **Dew:** -40 **Actual:** 4.5 **Required:** 4 **Regrind:** 15 **Kg:** 450 **Date:** 2026-10-13 **Lot:** 24C0231 **Resin:** PC clear **Dryer:** D1 **Temp:** 120 **Dew:** -40 **Actual:** 3 **Required:** 4 **Regrind:** 0 **Kg:** 300 **Date:** 2026-10-14 **Lot:** 24B0912 **Resin:** PET bottle grade **Dryer:** D3 **Temp:** 160 **Dew:** -45 **Actual:** 5.5 **Required:** 5 **Regrind:** 10 **Kg:** 600 **Date:** 2026-10-15 **Lot:** 24A7745 **Resin:** ABS **Dryer:** D2 **Temp:** 80 **Dew:** -30 **Actual:** 3.5 **Required:** 3 **Regrind:** 20 **Kg:** 400 **Date:** 2026-10-16 **Lot:** 24C0305 **Resin:** PA6 **Dryer:** D1 **Temp:** 80 **Dew:** -40 **Actual:** 4 **Required:** 4 **Regrind:** 0 **Kg:** 350 **Totals:** #### Total resin loaded **Key:** kg **Agg:** sum **Format:** number #### Lowest margin in hours **Key:** margin **Agg:** min **Format:** hours #### Average margin in hours **Key:** margin **Agg:** avg **Format:** hours **Summary:** #### Lots logged **Key:** entries **Expr:** count **Format:** integer #### Worst drying margin **Key:** worst **Expr:** min_margin **Format:** hours **Primary:** true **Description:** A negative value means at least one lot was loaded before reaching the required drying time. **Notes:** Take required hours, temperature and dew point from the resin supplier datasheet for your grade. Values in the sample rows are illustrative only. Include regrind in the drying plan, since it is often wetter than virgin pellets. ## Content **Intro:** Moisture in hygroscopic resin causes splay, brittleness and unpredictable viscosity. This log records lot, dryer settings and drying hours against the required time, so you can prove a lot was dried properly or find the one that was not. **Sections:** #### How to use the log **Body:** Enter one row per lot loaded to a dryer. Take the drying temperature, dew point and minimum time from the resin supplier datasheet for the exact grade. Record the actual time dried before the material went to the press. The margin column compares actual hours with required hours, and a negative margin signals under drying. Keep the sheet with the production records so lot traceability is complete. **Bullets:** - Use the datasheet for your exact grade - Log the dew point at the dryer outlet or hopper - Record regrind share with the lot - Treat a negative margin as a hold item #### Why drying matters **Body:** Nylon, polycarbonate, PET and many engineered grades absorb moisture from air. At melt temperature the water reacts with the polymer or turns to steam, giving splay, silver streaks, bubbles and lower impact strength. Desiccant dryers with a low dew point remove moisture far more reliably than hot air alone. Over drying and long residence time can also degrade some resins, so more is not always better. #### Reading the results **Body:** A positive margin means the material met the minimum time. A small negative margin may be tolerable in some cases, but that call belongs to your process engineer. The lowest margin figure in the summary tells you whether any lot in the period was at risk. If a defect occurs, you can match the date and lot to the dryer entry and check the settings. **Bullets:** - Negative margin: investigate before molding - Dew point warmer than spec: check desiccant and filters - High regrind share: confirm it was dried too #### Common mistakes **Body:** Refilling a hopper with undried material on top of dry material defeats the dryer. Using a dryer that is too small for the throughput gives less residence time than the datasheet requires, even when the setpoint looks right. Forgetting to include regrind and ignoring a dryer filter that needs cleaning are other frequent issues. **Cta:** If lot numbers and material usage already sit in your ERP, we can help connect them so drying records follow the lot automatically. **Faq:** #### How long should resin be dried? **Answer:** Follow the supplier datasheet. Typical times are several hours at a temperature that depends on the polymer, and they are tied to a dew point. Do not use generic values for critical parts. #### Do I need to dry polypropylene? **Answer:** Usually not, because it absorbs very little moisture. Always check the datasheet, since fillers and colorants can change behavior. #### What dew point should I target? **Answer:** Many drying specs call for about minus 30 to minus 40 degrees Celsius at the dryer, but your resin supplier gives the right figure for your grade. #### Why track regrind share? **Answer:** Regrind has already been through a heat history and may have picked up moisture. Knowing the percent helps explain a change in part quality and viscosity. ## Search terms resin dryer log, resin lot traceability log, material drying log template, hygroscopic resin drying record, injection molding material log excel, dryer dew point log, resin lot tracking worksheet --- Talk to an engineer: https://netray.co/contact?intent=erp_ai | Machine catalog: https://netray.co/agent/catalog.json