Custom Ziplock Bag Design
Ziplock Bag Wholesale
Ziplock bags are commonly used in both daily life and industrial production. Food-grade materials can store various fruits, snacks, tea, and other items, effectively providing moisture resistance and freshness while allowing for repeated use. Standard ziplock bags can be used for storing clothing, accessories, and other products, making them attractive to customers. Below, we introduce food-grade ziplock bags in detail.
Industrial Applications
In industrial production, ziplock bags are often used as inner and outer packaging for various components, hardware, and other items.
Selection of Raw Materials
Everything starts with the raw materials of the ziplock bag. The milky white granular substance shown is the primary material for manufacturing ziplock bags—scientifically known as polyethylene (PE). This virgin PE material is safe for direct food contact.
Blown Film Process
The raw material is poured into the machine hopper and processed through a film-blowing machine. This process forms plastic film, which is then wound into rolls, ready for the bag-making production line.
Bag-Making Process
During the bag-making stage, the plastic film is cut while simultaneously heat-sealed at the edges. Finally, workers manually package the ziplock bags, typically in packs of 100.
Understanding Thickness Measurement
Among various plastic films, thickness is commonly measured using “silk” (丝), a colloquial unit. One millimeter (mm) equals 100 silk. The higher the silk number, the thicker the bag.
Choosing the Right Thickness
When selecting ziplock bags, thicker does not always mean better—it depends on the stored items.
- For soft, non-angular items, extra thickness is unnecessary.
- For sharp, easily punctured, or chemical-related items, a minimum thickness of 10 silk is recommended. This is suitable for packaging bone-in foods, screws, nails, and other industrial products.
