How to Distinguish HDPE and LDPE Plastic Bags?

The Advantages of the LDPE Plastic Bags

Low-density polyethylene is the lightest variety among polyethylene resins. Compared with high-density polyethylene, its crystallinity (55%-65%) and softening point (90-100℃) are lower; it has good flexibility, elongation, transparency, cold resistance and processability; its chemistry Good stability, resistance to acid, alkali and salt solutions; good electrical insulation and air permeability; low water absorption; easy to burn. It is soft in nature, with good extensibility, electrical insulation, chemical stability, processing performance and low temperature resistance (-70℃).

 

The Disadvantages of LDPE Plastic Bags

The disadvantage of LDPE is its poor mechanical strength, moisture barrier, gas barrier and solvent resistance. The molecular structure is not regular enough, the crystallinity (55%-65%) is low, and the crystal melting point (108-126℃) is also low. Its mechanical strength is lower than that of high-density polyethylene, and its impermeability coefficient, heat resistance and solar aging resistance are poor. It is easy to decompose and change color under sunlight or high temperature, resulting in performance degradation. Therefore, when low-density polyethylene is made into plastic coils, antioxidants and ultraviolet absorbers are added to improve its shortcomings.

 

HDPE Plastic Bags

 

HDPE plastic is generally opaque. After biting with teeth, white stubble marks will appear at the cracks. The material is relatively brittle and hard, and it is often used for packaging products. However, LDPE is relatively soft, has good toughness, good transparency, and has a relatively slippery feel, and the sound produced by tearing by hand is relatively small.

 

According to the purpose, LDPE is widely used in light packaging materials such as waterproof carton lining, plastic wraps, and so on. It is also used in computer hardware covers and packaging, wash bottles, and more. HDPE is used in strong packaging materials such as plastic milk bottles, drums, bulk containers, bottle caps for industrial use. Also, it is used in pipes and tubing, plastic chairs and tables.

 

Our company has the HDPE plastic bags of high quality for sale, welcome to consult!

评论

发表评论

此博客中的热门博文

Why Choose Fengyi Plastic as Your Plastic Bag Manufacturer

图片
Over the years, there has been much discussion about plastic bags and their harmful effects on the environment and people. However, this hasn't affected their popularity. Why? Because they are the most cost effective, easy to use and easy to store packaging option. They benefit retailers and consumers in a variety of ways, so despite all the drawbacks, they remain a popular packaging option. Aware of the growing demand for clear plastic bags and other types of recyclable plastic bags, they are mass produced at wholesale prices.Fengyi has been one of the leading manufacturers of such plastic bags for over two decades. Now, you may ask, what makes   Fengyi Plastics   one of the leading manufacturers of small clear plastic plastic bags? Let us know why!   Top 5 Reasons to Choose General Plastics for Sourcing Plastic Bags When it comes to plastic bags, Fengyi is the name you can trust! Here's what sets us apart from other manufacturers. Extensive product portfolio under one roof: Y
阅读全文

What kind of plastic bags can I recycle?

图片
Plastic bag recycling (also known as plastic film recycling) can get tricky if you don't know what kind of plastic the bags are made of. Grocery store drop-off bins for plastic bag recycling accept polyethylene film, which includes high-density polyethylene (also known as HDPE or #2 plastic) and low-density polyethylene (also known as #4 plastic or LDPE). Most bags marked as #2 HDPE or #4 LDPE will fit in the drop box with your regular plastic shopping bags. However, many perfectly acceptable bags are not labeled as to what plastic they are - such as bread bags and Ziploc bags. When you take them back to the grocery store for recycling, you can actually put the bread bags and Ziploc bags in with the plastic grocery bags. Just make sure they're dry and clean and completely free of food debris. But it's true, frozen vegetable bags are not accepted. This is because the plastic in these bags usually contains additives or layers of other materials to protect the food. Additives
阅读全文

Learn Which Vacuum Bags are Best for Your Food

图片
Storing food in vacuum sealed bags is very common and convenient at the home and commercial level. There are vacuum-sealed bags that can be refrigerated or even frozen, thawed, and then heated. These bags require FDA-approved, high-quality, thick plastic to store food in because the bags can withstand hot and cold temperatures. They should not melt when heated and should not break and tear when frozen. This happens when low-quality thin plastic bags are used, so the FDA has separate standards for storing food because there should be no risk of melted plastic getting inside the food. This article discusses the various types of storage vacuum bags and which ones are best for storing food.   Types of plastic vacuum storage bags There are many different types, sizes, and uses of vacuum seal bags. Here are some of the bags that are considered to be the best for storing food. Laminated or vacuum bags. These are pre-cut bags with an external suction vacuum sealer. The pouches are usually betw
阅读全文