Category Archives: articles

Polystyrene (PS) is generally produced in such a way that an irregular structure is formed along the main branch. In fact, the repeating units are irregular. This structure prevents crystallization. Therefore, the resulting polymer is completely amorphous (glass transition temperature = F˚210, C˚100), which makes it very transparent. This property, along with its high tensile […]

Materials used in the blowing film process are divided into two major categories: polymers and additives. Many types of polymers are used to produce blow-drying films, but most of them are different grades of polyethylene. Additives are often used to improve performance, appearance and economic benefits. The choice of raw material to produce a particular […]

Polyethylene is chemically the simplest polymer resulting from the polymerization of ethylene monomer and consists of a long carbon chain in which each carbon atom is bonded to two hydrogen atoms. Certain molecules or chains may be very long, containing hundreds to tens of thousands of carbon atoms. Polyethylene chains may be linear or branched, […]

Polyethylene metallocene is a wide range of polymers that use metallocene catalysts in their production process. Also known as imposed geometric catalyst technology and single-site catalyst technology. In this relatively new method, there is tight control over the molecular structure of materials that allows chemists to design a wide range of polyethylenes with different properties […]

Lubricants are added to the polymer for two reasons: internal lubrication and external lubrication. External lubrication reduces friction between the polymer and process equipment such as die. For example, lubricants eliminate melt fracture by reducing the stress applied to the melt that passes through the die. In addition, the seepage and accumulation of material at […]

Antistatics are used to minimize the accumulation of electrical charge on polymer surfaces. Many polymers are exposed to static electricity during the process, such as the path of the film between the rollers that conduct it to the winder. This problem occurs especially when the humidity is very low. Antistatics disperse static loads by increasing […]

Antiblocks are materials that prevent the blocking of polymer surfaces. Blocking is a common problem in movies, especially blown movies. When the film bubble passes through the nip rolls and the two layers of film are pressed together, there is a tendency for adhesion between them. The anti-block helps the two layers not stick together […]

Polyvinyl chloride (PVC) is the most widely used polymer in terms of volume worldwide. Although health and environmental concerns have led to the failure of the participatory market in some specific applications, PVC has a wide range of other uses, such as wood substitutes and aluminum profiles in construction products. In the production of PVC […]

Ethylene vinyl alcohol (EVOH) is similar to EVA. It is also a copolymer of polyethylene with a percentage of vinyl comonomer along the main branch. In fact, EVOH arises from the conversion of VA units along EVA branches into vinyl alcohol (VOH) units. Depending on the conversion percentage of VA to VOH, different types of […]