聚合物气体辅助挤出成型

介绍了气体辅助挤出成型新工艺，阐述了气辅挤出系统，特别是气辅挤出口模的组建和设计，概述了气辅挤出成型机理、和传统挤出相比所具有的技术优势、工艺实现及其在应用中需要注意的关键问题。     

振动力场下聚合物塑化挤出技术研究

介绍玫种将电磁场引起的机械振动力场引入聚合物塑化挤出全过程的塑料电磁动态塑化挤出设备,讨论了它的原理、结构及应用,实验与生产表明,塑料电磁动态塑化挤出设备在加工聚烯烃时能耗降低２０％～５０％,挤出熔体温度降低２０℃以上,制品拉伸强度提高１６％以上,对无机填料充体系的兴旺聚散效果提高。     

聚合物挤出发泡成型设备的特点分析

结合发泡成型工艺,分析说明了传统的挤出发泡系统、串联挤出发泡系统的结构设计特点,介绍了动态成型设备和基于拉伸流变的高分子材料塑化运输设备在挤出发泡成型加工中的应用;对比分析了各种不同的挤出发泡系统在发泡成型工艺上的特点;同时提出了连续发泡成型对注气装置的要求。     

塑料挤出成型加工设备

介绍单、双螺杆挤出机的特征,主要结构与工作原理,以及典型挤出口模。     

挤出成型中聚合物熔体流动的基本研究

在聚合物的挤出工艺中，控制聚合物熔体流动和热传递是保证制品质量的关键。本文对熔体流动进行基本分析，并找出一些质量问题的成因。     

聚合物塑化注射成型过程的研究

全面分析了聚合物塑化注射成型的工作周期与机理,阐述了聚合物塑化注射成型过程的控制策略,并揭示了聚合物注塑成型技术及其装备的发展现状与前景。     

模拟技术在聚合物挤出成型中的应用

当今，计算机模拟技术在聚合物挤出领域中成为新的发展点，通过编程模拟聚合物熔体在机头内的流动来展示了机头内的结构。为了满足聚合物挤出的需要，根据熔体的流动状态来最佳的口模结构，本文介绍了计算机模拟的基本内容，步骤以及模拟技术在双层复合膜共挤出中的应用。     

塑料挤出成型设备的发展现状

本文介绍了国内外塑料挤出成型设备的发展现状。     

高聚物挤出造粒形式和原理

本文主要介绍了高聚物熔体挤出造粒的几种形式、工作原理、设备结构和使用范围,并提出了应遵循的原则     

聚合物反应性挤出加工及挤出反应器

介绍了反应性挤出加工以及螺杆挤出反应器的特点,并详述了螺杆挤出反应器所需具备的工艺条件。     

基于电磁动态塑化挤出的模头挤出特性的研究

本文以塑料电磁动态塑化挤出机上的圆截面模头为对象,研究了将振动力场引入聚合物塑化挤出全过程条件下圆截面模头的挤出特性,建立了圆截面模头脉动挤出特性的数学模型,并进行了实验研究,理论分析与实验结果趋向一致,从而揭示了振动力场引入聚合物塑化挤出全过程对圆截面模头挤出特性的影响规律。     

振动力场作用下聚合物填充体系挤出混合特性

本文利用一种新型毛细管动态流变仪,对碳酸钙填充聚丙烯体系进行了实验性研究。发现质量百分比为８５／１５的ＰＰ／ＣａＣＯ３填充体系,在一较佳振动条件下动态挤出时,振动场的存在对ＣａＣＯ３在ＰＰ熔体中的分散有促进作用,大大改善了混合料的混合程度。     

线型聚合物毛细管挤出中熔体破裂研究进展

回顾了近年来在熔体破裂方面的研究进展，详细介绍了熔体破裂形成的4种常见机理，并简要介绍了消除熔体破裂的方法。     

聚合物及其加工技术研究的一些新动向

扼要介绍了用于聚合物加工的振荡挤出模具、固态成型加工技术、用于聚合物合金设计系统探索性研究的工具软件、可降解的聚合物、永久性抗静电聚苯乙烯共混材料和以弹性体为基材的纳米复合材料等方面研究的一些新动向.     

Polymer Extrusion Devolatilization

Polymer devolatilization, including flash, surface renewal and stripping‐agent‐added techniques in screw extruders, is one of the most important polymer processing technologies. Its development requires an understanding of the relationships among some facts and subjects. Surface renewal devolatilization (SRDV) is a commonly used technique, which includes the two essential elements of film interface area and exposure time. A main feature of SRDV in various types of screw extruders is extrusion devolatilization, in which those elements vary with screw speed and throughput. An extrusion‐devolatilization model for SRDV model has been developed, which solves some important engineering problems encountered in devolatilization.     

Quantitative Characterization of Viscoelastic Properties and their Relationship During Extrusion Flow of Polymer Melts

The viscoelastic behavior, such as end pressure losses, die swell, and normal stress difference, is a very important rheological phenomenon of viscoelastic fluids in channel flow. Therefore, understanding the elastic behavior and the mechanisms is quite necessary and meaningful for polymer rheology. Extrusion is a usual processing way in polymer industry. The viscoelastic behavior and the factors affecting it during die extrusion flow of polymeric melts are discussed, and the relationships among these viscoelastic properties, such as entry pressure drop (ΔP _en), exit pressure drop (ΔP _ex), die-swell ratio (B), and the first normal stress difference (N ₁), are analyzed in this article. The results showed that there are some simple and available expressions for describing the relationships among these viscoelastic property parameters and the values of these parameters can be evaluated. Furthermore, the recent progresses in the quantitative expressions for prediction of these viscoelastic property parameters and their correlations are briefly reviewed.     

Laboratory modular instrumented single screw extruder for optimisation of polymer processing

Abstract

A laboratory fully modular instrumented single screw extruder designed to gather information on the development along its axis of temperature, mixing, chemical conversion and/or morphology development of a given material is presented. Some of its capabilities are utilised to study the effect of operating conditions and of screw geometry, including conventional versus barrier profiles, on the evolution of the plasticating sequence of a low density polyethylene. Melting of an immiscible polymer blend (polyamide 6/polypropylene) is also investigated and a specific melting mechanism is proposed.     

Extrusion Characteristics of Round-Section Dies with VFF

A vibration force field was applied to the whole process of polymer plasticating extrusion by periodical vibration of the screw. It observably affected both the extruder screw extrusion characteristics and the round-section die extrusion characteristics. It also affected the polymer plasticating extrusion process and the quality of the extrudates. An analytical model of typical dynamic extrusion of round-section dies was created. The results showed that a vibration force field can improve extrusion output.