This article provides a comprehensive overview of screw maintenance for extruders. It covers key topics such as screw cleaning methods, including the use of purging compounds and HDPE as a cost-effective alternative, as well as the causes and effects of screw wear. It also explains the procedures for removing screws, the materials used in screw manufacturing, and how to select the right materials based on processing needs. Additionally, a Q&A section addresses common concerns, such as increasing production output, screw design, and wear prevention. This guide is valuable for anyone involved in plastic extrusion or recycling operations.

This article explains the structure and function of extruder screws, which are divided into three main zones: the feeding zone, where solid resin is transported and preheated; the compression zone, where the resin melts through external heating and shear heat; and the metering zone, which ensures uniform extrusion. Additionally, the article discusses darmage(a mixing section), screw elements used in twin-screw extruders, the compression ratio affecting resin flow and pressure, and the barrel, which houses the screw and facilitates heat transfer. Proper screw design is essential for optimizing resin plasticization, mixing, and extrusion efficiency.

This article discusses the selection principles and specific applications of plastic additives. Additives should be chosen based on the intended purpose, ensuring they can fully perform their functions and meet the required standards and performance specifications. Various types of additives and their applications are listed, including toughening, reinforcing, flame retardant, antistatic, conductive, magnetic, thermal conductivity, heat resistance, transparency, wear resistance, insulation, and barrier properties. The selectivity of additives for different resins is also addressed, highlighting the effectiveness of red phosphorus, nitrogen-based flame retardants, nucleating agents, and glass fiber heat resistance modifiers for specific resins. For example, red phosphorus is effective for PA, PBT, and PET, while nucleating agents work well for copolymer polypropylene.

Filler masterbatch refers to the granules and powders obtained by mixing and kneading various additives and fillers with a small amount of carrier resin in the process of plastic processing and molding for the convenience of operation. The main component of filler masterbatch is filler, which is mainly used for the processing and molding of polyolefins (polyethylene and polypropylene), and is also called polyolefin filler masterbatch.

Polyethylene terephthalate is a colorless, transparent substance with a certain gloss (amorphous), or an opaque milky white substance (crystalline). Physical properties: Polyethylene is non-toxic, odorless, and milky white. It has a density of 0.91-0.96g/cm3 and is a crystalline plastic. Polyethylene has a certain mechanical strength, but its mechanical strength is lower than that of other plastics and its surface hardness is poor.

Plastic additives, also known as plastic auxiliaries, are compounds that must be added to polymers (synthetic resins) during molding to improve their processing properties or to improve the performance of the resin itself.

How much do you know about hot melt adhesive? 1、 Composition of hot melt adhesive 2、 Characteristics of hot melt adhesive 3、 Types and applications of hot melt adhesives 4、 Main testing indicators of hot melt adhesive 5、 The main factors affecting the adhesion of hot melt adhesive 6、 Correct usage of hot melt adhesive

The blending toughening of polypropylene PP is widely used in various fields due to its significant effects, low industrial investment, and fast and easy implementation. Blending toughening modification refers to the use of other plastics, elastomers, and inorganic powders as modifiers to blend with PP to improve the toughness of PP plastics.

During blown film production, the adverse reactions of raw materials are summarized in the table below for reference.