Common Types of plastic roll films
1. Stretch Film
Stretch film is highly elastic and wraps tightly around items without adhesives. It’s mainly used for securing pallet loads, bundling products, and protecting goods from dust and moisture. The film “stretches” to hug the load firmly.
2. Shrink Film
Shrink film tightens when heated, conforming perfectly to the shape of the product. You often see it covering bottles, CDs, or gift baskets. It provides a tamper‑evident, dust‑proof seal.
3. Cling Film (Food Wrap)
This is the thin, sticky film used in kitchens to cover bowls or wrap sandwiches. It clings to itself and to smooth surfaces, keeping food fresh by blocking air and moisture.
4. Barrier Film
Barrier films are multi‑layer structures designed to block oxygen, 水分, or light. They are essential for vacuum packaging coffee, 肉, 奶酪, and other sensitive foods to extend shelf life.
5. Industrial Lidding Film
Used to seal trays (like ready meals or yogurt cups), lidding film bonds to plastic or foil trays. It often includes an easy‑peel feature.
Key Materials Used
| 材料 | 主要特性 | 常见应用 |
|---|---|---|
| LDPE (Low‑Density Polyethylene) | Soft, 灵活的, good clarity, moisture‑resistant | Cling film, bread bags, 工业内衬 |
| llde (Linear Low‑Density Polyethylene) | 高拉伸强度和抗穿刺性 | Stretch wrap (pallet wrap) |
| PVC (聚氯乙烯) | Excellent clarity, moderate cling, low cost | Some food wrap, shrink film for non‑food items |
| 宠物 (聚对苯二甲酸乙二醇酯) | 强的, 清除, excellent gas barrier | Shrink sleeves, high‑clarity blister packs |
| evoh (乙烯-乙烯醇共聚物) | Very high oxygen barrier (usually a thin layer between other plastics) | Vacuum bags, barrier films for meat & 奶酪 |
| PA (聚酰胺 / 尼龙) | 艰难的, puncture‑resistant, good heat tolerance | Vacuum pouches, shrink bags for large cuts of meat |
笔记: Many high‑performance films are co‑extruded — they combine several materials (例如。, 宠物 + evoh + PE) to get the best of each: strength, 障碍, and sealability.
Choosing the plastic roll films
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For packaging and shipping: 使用 stretch film (llde) for pallet wrapping, 或者 shrink film for individual product protection.
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For food freshness at home: Go with 保鲜膜 (LDPE or PVC).
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For long‑term food storage (vacuum sealing): Choose a multi‑layer barrier film containing EVOH or Nylon.
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For tamper‑evident lids: Select lidding film compatible with your tray material.
最后的想法
plastic roll films are a versatile packaging solution, and understanding the difference between stretch, 收缩, cling, and barrier films helps you pick the right one for your needs. Pay attention to materials like LDPE, llde, or EVOH — each brings specific strengths to the table. Whether you’re running a warehouse, a food business, or just wrapping leftovers, there’s a perfect roll film for the job.
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