UNDERSTANDING HOW PRODUCT AND ATMOSPHERE LOADING TEMPERATURES AFFECT YOUR BULK BAGS
A lesser-known factor when it comes to safely using your FIBCs is understanding how product and atmospheric loading temperatures can affect your bulk bags. When discussing product temperatures, it is important to understand that the tapes used to weave FIBC fabric are manufactured through an extrusion process. During extrusion, polypropene pellets are melted into a liquid that is then forced through a die into a very thin sheet of material and cooled in a water bath.
Due to this manufacturing process, the chemical properties of the polypropylene can become highly susceptible to melting in conditions where the product and/or environmental temperature exceeds the material melting point.
Product Loading Temps and FIBC Melting
The polypropylene used in your FIBC has a relatively low melting point of 230°F. This means that the material will become more elastic as product temperatures increase and begin to melt as temperatures approach 230°F. While an FIBC may be able to withstand product temperatures up to 230°F, the material may be adversely affected as product temperatures increase, which will reduce the bag’s performance and safe handling. It is recommended that product temperatures be between 50°F – 149°F to ensure the material is not compromised. Heavier fabric weights and breathable fabrics can help withstand higher temperatures if it’s not possible to fill at a temperature below the recommended 149°F.
Environmental Loading Temperatures
Regarding environmental loading temperatures, it is recommended that bags are stored and filled in an environment where temperatures are between 50°F and 140°F. If the environmental temps exceed 176°F, there is no escape route for the heat generated inside the bag, which will result in dimensional instability of the product, leading to a possible bag failure.
Obviously, atmospheric temperatures will not naturally reach 176°F. It is, however, important to consider where your bags are being stored or staged once loaded… i.e., near equipment (possibly a furnace, dryer, or kiln) that may produce radiant heat.
On the negative side, polypropylene is also a homopolymer, which can become brittle like glass when exposed to extremely low temperatures. This point is defined as the “glass transition point.” This brittle point can be reached when temperatures drop below 14°F. These extremely cold temperatures may result in damage of components or loop breakage, which could lead to a catastrophic bag failure.
Practical Tips for Managing FIBCs in Extreme Temperatures
- Tip 1: Always check both product and environmental temperatures before loading to ensure they fall within the recommended range. This can prevent potential damage and ensure the longevity of your FIBCs.
- Tip 2: Consider using temperature sensors or indicators to monitor conditions during storage and transport, especially if you suspect the temperatures may fluctuate beyond safe levels.
- Tip 3: If your product temperature is high, consider filling FIBCs in a cooler environment or allowing the product to cool down to within the recommended range before loading.
- Tip 4: For products with high loading temperatures, using thicker fabric or incorporating breathable materials in the FIBCs can help dissipate heat more effectively.
- Tip 5: When dealing with low temperatures, ensure that your FIBCs are handled with care to avoid sudden impacts or stress that could cause the material to become brittle and break.
Frequently Asked Questions (FAQs)
1. What is the maximum safe temperature for FIBCs?
The maximum safe temperature for standard polypropylene FIBCs is 230°F. However, it is recommended to keep product temperatures between 50°F and 149°F to ensure the bag’s material is not compromised.
2. Can FIBCs be used in freezing temperatures?
FIBCs can be used in freezing temperatures, but it’s important to note that polypropylene can become brittle at temperatures below 14°F. This brittleness can lead to component or loop breakage, so extra care should be taken when handling FIBCs in extremely cold conditions.
3. What materials can be used if the product temperature exceeds 200°F?
If your product’s temperature exceeds 200°F, consider using FIBCs with thick aluminum liners or switching to bags made from alternative materials like polyester, which can withstand higher temperatures.
4. How can I prevent FIBC failures due to environmental temperatures?
To prevent FIBC failures, ensure that bags are stored and filled in environments where temperatures are within the safe range of 50°F to 140°F. Avoid placing bags near equipment that emits radiant heat, such as furnaces or dryers.
5. What should I do if I’m unsure about the temperature safety of my FIBCs?
If you’re unsure whether your FIBCs are suitable for your specific temperature conditions, consult with your FlexSack sales representative. They can help you determine the best options for your needs.
For more information on product or environmental loading temperatures and how they may affect your FIBCs, please contact your FlexSack sales representative or send your questions to sales@flexsack.com.
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