𝐓𝐨𝐝𝐚𝐲'𝐬 𝐊𝐍𝐎𝐖𝐋𝐄𝐃𝐆𝐄 𝐒𝐡𝐚𝐫𝐞 : 𝐌𝐚𝐭𝐞𝐫𝐢𝐚𝐥 𝐃𝐫𝐲𝐢𝐧𝐠 — 𝐓𝐡𝐞 𝐈𝐧𝐯𝐢𝐬𝐢𝐛𝐥𝐞 𝐒𝐭𝐞𝐩 𝐓𝐡𝐚𝐭 𝐂𝐚𝐧 𝐑𝐮𝐢𝐧 𝐚 𝐏𝐞𝐫𝐟𝐞𝐜𝐭 𝐏𝐚𝐫𝐭

 𝐓𝐨𝐝𝐚𝐲'𝐬 𝐊𝐍𝐎𝐖𝐋𝐄𝐃𝐆𝐄 𝐒𝐡𝐚𝐫𝐞

🔹 𝐌𝐚𝐭𝐞𝐫𝐢𝐚𝐥 𝐃𝐫𝐲𝐢𝐧𝐠 — 𝐓𝐡𝐞 𝐈𝐧𝐯𝐢𝐬𝐢𝐛𝐥𝐞 𝐒𝐭𝐞𝐩 𝐓𝐡𝐚𝐭 𝐂𝐚𝐧 𝐑𝐮𝐢𝐧 𝐚 𝐏𝐞𝐫𝐟𝐞𝐜𝐭 𝐏𝐚𝐫𝐭

A mold can be perfect.

The machine can be perfectly tuned.

The material can be premium quality.

Yet the part still fails.

Why?

Because some plastics absorb moisture from the air long before they reach the molding machine.

🔍 Which materials are sensitive to moisture?

Many engineering plastics are hygroscopic, meaning they absorb water from the environment:

💧 PA (Nylon)

💧 PC (Polycarbonate)

💧 PBT

💧 PET

💧 ABS/PC blends

Even a small amount of moisture can significantly affect the molding process.

⚠️ What happens if material is not dried properly?

Common defects include:

❌ Silver streaks on the surface

❌ Bubbles or voids

❌ Reduced mechanical strength

❌ Poor dimensional stability

❌ Increased scrap rates

In some cases, the material begins to degrade during processing.

💡 Why drying matters

Proper drying ensures:

✅ Better surface quality

✅ Consistent mechanical properties

✅ Stable processing conditions

✅ Reliable part performance

Material suppliers often specify:

🌡️ Drying temperature

⏱️ Drying time

💦 Maximum moisture content

Ignoring these recommendations can create problems before the plastic even enters the mold.

🧠 Engineering insight

Not every plastic requires drying.

For example:

✔️ PP (Polypropylene) typically requires little or no drying

✔️ PE (Polyethylene) is generally moisture-resistant

But engineering materials like PA, PC, and PBT demand careful moisture control.

Understanding the material is just as important as understanding the mold.

Material handling is considered part of the process—not an afterthought.

Because quality starts long before the first shot is injected.

source : SCSplastic

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