Extrusion Molding Introduction

Extrusion molding

To know us more, please visit   ￫ ￫ ￫ ￫  www.spider.com.tw

Extrusion molding, also known as extrusion molding or extrusion molding, is one of the commonly used plastic processing methods. Many other processes, such as blow molding and wire coating, also need to be extruded to form the manufacturing process. a part.

Extruder, also known as extruder, heats and fuses plastic materials such as pellets or pellets of plastic fibers to form a molten material, and then continuously melts this material from the forming die (mold). The extrusion, after cooling it to form a continuous product.

These products include wire and cable encapsulated products.

This molding method can still include many post-processing operations.

• For example, extruders can generally be divided into
• Single-Screw Extruder
• Double-Screw Extruder
• Multi-Screw Extruder

There are also special non-screws, which are mostly single-screw type in practical use.

The internal structure of a typical single screw extruder can be divided into seven sections

one,

(1.) Feeder Hopper.(2.) The Barrel is equipped with a screw for the hollow cylinder body, where the plastic melts into a liquid and the outside is equipped with a heating or cooling system.(3.) The screw is used to mix and heat the plastic to make it liquid and send it to the die.(4.) Screen Pack and Breaker Plate is used to filter impurities in plastic materials and generate Back Pressure.(5.) The die (Die) is used to determine the shape of the extrudate.(6.) Moter and Gear Reduction System.(7.) Thermocouple pressure gauges and other equipment.

Second, the extrusion flow estimate derivation: Extrusion is a continuous process, its flow will determine the production capacity, is an important related parameters. How to estimate the traffic, the relevant formula for deducing traffic is now as follows.

Assumptions:

1. The screw is uniformly melted2. The screw diameter is constant (D(constant))3. Viscosity is not a function of speed (function of temperature (ì=ì(T)))4. The flow rate is a function of the screw geometry, melt material, and operating parameters, ie Q=f(D,h,N) (processing parameter: N) (melt meterial): μ )

Extrusion molding is an important process in the field of polymer processing and has been widely

Used in the manufacture of flat products, films, tubes, and many other daily necessities,

Such as acrylic sheets,

Cellophane, plastic tubes, etc. are all produced by extrusion molding process, common polymer

Plastics such as PE, PS, PVC, ABS, etc. can be finished by extrusion molding.

Excuse

The molding process is mainly to melt and transport the polymer plastic through the screw extruder.

The slope becomes smaller

After the die is ejected, the molten plastic is expanded into a flat plate or film and even a variety of finished products are produced.

Shape, finally extrusion die outlet, after cooling, curing and then through the transmission, cutting and other processing

The program is a product.

In general, process design for industrial use, in addition to the application of special requirements,

The general product must reach a certain degree of uniformity in thickness, while the polymer melt is extruded

The flow in the program should avoid the creation of vortex or stagnant area because

This region is subject to the phenomenon of polymer degradation, and impurities and air bubbles easily trap in it.

It caused instability in processing.

Twitter ： https://twitter.com/SpiderExtrusion

Linkedin ：https://www.linkedin.com/in/spiderextrusion

Google plus  https://plus.google.com/u/0/110466745260693019079

Youtube  https://www.youtube.com/channel/UCL-kZL7bQEQkRwUw8O3CnFw

Facebook  https://www.facebook.com/spider.extrusion/

Taiwantrade https://spider.en.taiwantrade.com/