What does PE need to do? What is PE?

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PE is polyethylene and is a food-grade plastic that can be used in food.

Food-grade plastic is a material that meets the national food safety requirements, and will not produce toxic substances during use, and there are many types of plastic packaging for food contact, including polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), polyester (PET), polycarbonate (PC), etc. Among them, polyethylene is a thermoplastic resin prepared by polymerization of ethylene.

Polyethylene is odorless, non-toxic, feels like wax, has excellent low temperature resistance, the minimum use temperature can reach 100 °C-70 °C, good chemical stability, and can resist the erosion of most acids and alkalis.

General properties of polyethylene

Polyethylene resin is a non-toxic, odorless white powder or granule, the appearance is milky white, with a wax-like feel, low water absorption, less than. The polyethylene film is transparent and decreases as the crystallinity increases. The water permeability of polyethylene film is low but the air permeability is large, which is not suitable for fresh-keeping packaging but suitable for moisture-proof packaging.

The flammable and oxygen index is, low smoke when burning, a small amount of molten droplets, yellow on the flame and blue on the bottom, and paraffin smell. Polyethylene has good water resistance. The surface of the product is non-polar, which is difficult to bond and print, and has been improved by surface treatment. There are many branched chains, and its resistance to light degradation and oxidation is poor.

Its molecular weight is in the range of 10,000,000. If the molecular weight exceeds 100,000, it is ultra-high molecular weight polyethylene. The higher the molecular weight, the better its physical and mechanical properties, and the closer it is to the required level of engineering materials.

However, the higher the molecular weight, the more difficult it is to process. The melting point of polyethylene is 100 130, and it has excellent low temperature resistance. It can still maintain good mechanical properties at -60, but the operating temperature is 80 110.

It is insoluble in any known solvent at room temperature, and can be dissolved in a small amount in solvents such as toluene, amyl acetate, trichloroethylene and more than 70.

Understand PE as a: direct disc running, powerful, lite XP system Windows PE stands for Windows Preinstallation Environment, that is, Microsoft Windows Preinstallation Environment, which is a tool based on Windows XP Professional running in protected mode, and only has a few (but very core) services for the Win32 subsystem. These services provide Windows installation, network sharing, automated underlying processing, and hardware validation.

Windows PE allows information technology (IT) personnel to build custom solutions that accelerate the desktop deployment process with automation, so they can keep desktops updated with less time and effort. Windows PE is capable of running Windows installers, scripts, and image-making applications. Enterprise Agreement (EA) and Software Assurance Membership (SAM) customers acquired Windows PE in the October 2002 update, and it will continue to be available to users as a benefit of Software Assurance.

Windows PE lets you create and format hard drive partitions and gives you access to NTFS file system partitions and internal networks. This pre-installed environment supports all mass storage devices that can be driven with Windows 2000 and Windows XP, and you can easily add drivers for new devices. Supports file copying, deletion, and partition formatting of FAT, FAT32, and NTFS system partitions.

Using Windows PE can help you convert your existing MS DoS-based tools to 32-bit Windows APIs, making it easier for you to maintain these applications in a standard development environment such as Microsoft's VisualStudio. Windows PE includes hardware diagnostics and other pre-installed tools that support the standard Windows XP driver, so you don't have to do anything else. For program developers, they can focus on the diagnosis, debugging, and development of the program.

The benefits of PE system on how to reinstall a computer system, many people have seen it and integrated it, and assembled the computer 4

If you forget the password of the system, you can use the tool he brought to remove the virus in the computer, and you can use PE into the system to back up the data Manual antivirus Of course, you know how to manually disinfect the system file You can enter PE to put the lost files in.

PE is polyethylene, and its main use is in the production of plastic products.

1.There is good flexibility. The molecular chain of PE contains branched chains, but the number of branched chains varies depending on the polymerization method, and in general, HDPE has the most branched chains.

The number of branched chains will inevitably affect the repeated folding and tight stacking properties of the molecular chains, resulting in a decrease in crystallinity and density, and it will also affect the fluidity of its melt. With branched chains, especially molecular chains with long branched chains, the viscosity is less when melted. Therefore, HDPE has the smallest viscosity.

2.It has no polarity, which determines that it has excellent dielectric properties and electrical insulation. Its hygroscopic cinnamon is very small, and the water absorption rate is only, so that its electrical properties are not affected by the ambient humidity and change greatly.

It has a small dielectric constant, which is about, and the dielectric loss factor is also small, and the volume resistivity is high. Since it is a non-polar material, its dielectric properties are not affected by the frequency of the electric field.

3.Under the action of many active substances, stress cracking will occur, also known as environmental stress cracking, which is a unique phenomenon of polyolefin plastics, especially PE.

4.The most widely used is the plastic variety, which can extrude and calender into various films, blow mold into various containers, and extrude into various profiles and monofilaments. Injection molding into a variety of daily necessities, such as bottle shells, lampshades, toys, stationery, basins, bowls, etc., can also be made into instruments, bicycles, some parts in automobiles.

PE is called polyethylene.

Polyethylene: divided into low molecular weight and high molecular weight, low molecular weight is generally liquid, colorless, tasteless, insoluble in water, density of 0 92 grams cm3, can be used as lubricating oil and coatings; The high molecular weight is generally solid, milky white, thermoplastic, waxy to the touch, and the density is between 0 92 0 96 grams cm3. It is corrosion-resistant and has good insulating properties.

High-density polyethylene has the characteristics of rigidity, hardness and mechanical strength, and can be used as containers, pipes, and high-frequency electrical insulation materials for radar and television. It is insoluble in water, has very little water absorption, and is only slightly soluble in some chemical solvents, such as toluene, acetic acid, etc., at temperatures above 70. However, the microgranular polyethylene can be melted or solidified with the change of temperature between 15 and 40, and melt when the temperature rises, absorbing heat; When the temperature drops, it solidifies and releases heat.

And because it absorbs little water, it is not easy to get wet, and it has insulating properties, so it is a good building material. Microgranular polyethylene is mixed with cement to make walls and floors. Taking advantage of its endothermic melting and exothermic solidification properties at normal temperatures, it melts and absorbs heat when the room temperature risesWhen the temperature drops, it solidifies and emits heat.

This keeps the room temperature stable. Therefore, it is a better heat storage material. According to its other properties, this building material is also resistant to leakage, heat, moisture and corrosion.

Commonly used to make:

1. Electrical insulating materials.

Due to its high specific stability, moisture resistance and high dielectric properties, polyethylene has made it an insulating material in electrical engineering and non-group electrical engineering.

2. It is used as a material for resisting erosion chemical reagents, and can be used as chemical structural materials, such as various parts, pipes, anticorrosive linings, etc.

3. It is used for packaging.

Polyethylene flakes and films have low density, softness without plasticizers, high tear strength, non-absorbent, impermeable and chemical resistance, which are necessary for packaging materials, so polyethylene film has a very broad market in the packaging industry and gradually replaces celluloid.

There are many kinds of PE, I guess you mean polyethylene.

Polyethylene (PE) is a thermoplastic resin prepared by polymerization of ethylene. In industry, it also includes copolymers of ethylene with a small amount of -olefins. Polyethylene is odorless, non-toxic, feels like wax, has excellent low temperature resistance, good chemical stability, and can resist the erosion of most acids and alkalis.

It is insoluble in general solvents at room temperature, has low water absorption and excellent electrical insulation performance.

High-pressure polyethylene: more than half is used for film products, followed by pipes, injection molded products, wire wrappings, etc.

Medium and low, pressed polyethylene: mainly injection molded products and hollow products.

Ultra-high pressure polyethylene: Due to the excellent comprehensive properties of ultra-high molecular weight polyethylene, it can be used as an engineering plastic.

Melting point 140

Melting enthalpy printing aspect.

It is suitable for product labels with high resistance to water, oil and chemicals, and Hanyuan Printing often applies this material to cosmetics, shampoos, washing and other daily chemical labels that require moisture resistance and extrusion resistance during use. Excellent softness, especially for plastic bags. It can also be used in cases where PVC label materials cannot be used due to environmental requirements.

Processing. Polyethylene can be processed by blow molding, extrusion, injection molding and other methods, and is widely used in the manufacture of films, hollow products, fibers and daily miscellaneous products.

Apply the film. Low-density polyethylene is widely used as a packaging material for various foods, clothing, medicines, fertilizers, industrial products, and agricultural films. It can also be processed into a composite film by extrusion for packaging heavy objects.

Since 1975, high-density polyethylene film has also been developed, which has high strength, low temperature resistance, moisture resistance, and good printability and processability.

In addition, polyethylene coatings can be extruded on paper, aluminum foil or other plastic films to make polymer composites.

Hollow products. High-density polyethylene has high strength and is suitable for hollow products. Such as milk bottles, detergent bottles;

The extrusion method of pipe sheet can produce polyethylene pipes, and the high-density polyethylene pipes have high strength and are suitable for underground laying; The extruded sheet can be reprocessed; High-density polyethylene can also be made into low-density foam plastic by foam extrusion and foam injection method as a tabletop and building materials; Protective sleeves (e.g. cable jackets).

The fiber is called polypropylene in China, which is generally made of low-pressure polyethylene as raw material and spun into synthetic fibers. Ethylene is mainly used in the production of fishing nets and ropes, or spun into staple fibers for use as flocculents, and can also be used in industrial acid and alkali resistant fabrics.

Ultra-high strength polyethylene fibers (up to 3 4 GPA) have been developed, which can be used as bulletproof vests, composite materials for automobiles and marine operations.

Miscellaneous productsThe miscellaneous products produced by injection molding method include daily miscellaneous goods, artificial flowers, turnover boxes, small containers, parts of bicycles and tractors, etc.; refrigerator containers, storage containers, household kitchenware, sealing lids, etc.; High-density polyethylene is used in the manufacture of structural parts.

Of course, there are many other uses

You can install this PE system directly on your computer. In this way, you can select Start PE in the boot menu when you boot up.

It is also possible to use the disc to boot the computer into PE.

The Windows Preinstallation Environment (Windows PE), the Windows Preinstallation Environment, is the smallest Win32 subsystem with limited services, based on the Windows XP Professional kernel and above running in protected mode.

It includes the minimal functionality required to run Windows installers and scripts, connect to network shares, automate basic processes, and perform hardware validation.

It is used to install, deploy, and repair Windows Desktop (Home, Professional, Enterprise, and Education), Windows Server, and other Windows operating systems, while Windows PE is not a normal operating system for ordinary users, and is mostly used by developers and maintenance of the main and primary systems.

Windows PE contains the PE kernels of Windows XP, Windows Server 2003, Windows Vista, Windows 7, Windows 8, and Windows 10.

Disk Operations:

Create, delete, format, and manage NTFS file system partitions with Windows PE.

This feature is very practical and convenient for individual users. For Disk Management in Windows NT and above, it is a text-mode command interpreter that allows users to manage objects (disks, partitions, or volumes) by using scripts or entering directly from the command prompt.

Windows PE uses DiskPart instead of Fdisk. For details on how to use diskpart, please refer to its entry. In addition, the most convenient place to compare diskpart tool and fdisk is that diskpart supports scripts.