Development of an extrusion system for producing fine-celled HDPE/wood-fiber composite foams using CO2 as a blowing agent

2004 ◽  
Vol 23 (4) ◽  
pp. 263-276 ◽  
Author(s):  
H. Zhang ◽  
G. M. Rizvi ◽  
C. B. Park
Keyword(s):  
Fiber Composite ◽  
Wood Fiber ◽  
Blowing Agent ◽  
Composite Foams

A Novel Design for Producing Fine-Celled Foams of Plastic/Wood-Fiber Composites

2000 ◽  
Author(s):  
Ghaus M. Rizvi ◽  
Chul B. Park
Keyword(s):  
System Design ◽  
Cell Morphology ◽  
Fiber Composite ◽  
Wood Fiber ◽  
Fiber Composites ◽  
Wood Fibers ◽  
Blowing Agent ◽  
Composite Foams ◽  
Innovative System ◽  
Novel Design

Abstract This paper presents an innovative system design for production of plastic/wood-fiber composite foams based on a chemical blowing agent (CBA). Wood-fiber inherently contains moisture, which adversely affects the foam processing and the resultant cell morphology. To improve the cell morphology, the moisture content in the final foam should be minimized. A novel system design is presented for achieving this goal. Undried wood-fibers were processed together with HDPE, CBA and a coupling agent (CA) in a tandem extrusion system. At the interconnection of the two extruders, a vent was provided to purge the moisture into the atmosphere. HDPE/wood-fiber composite foams were produced on this system and on a single extruder without the vent, for comparison. The cellular morphology and volume expansion ratios of the foamed composites were characterized. The foams produced on the newly developed tandem system exhibited significantly improved cell morphology and surface quality.

scholarly journals Role of Wood Fibers in Tuning Dynamic Rheology, Non-Isothermal Crystallization, and Microcellular Structure of Polypropylene Foams

Materials ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 106 ◽  
Author(s):  
Yongming Song ◽  
Youyong Wang ◽  
Hao Li ◽  
Qiling Zong ◽  
Ailing Xu
Keyword(s):  
Isothermal Crystallization ◽  
Fiber Composite ◽  
Cell Structure ◽  
Wood Fiber ◽  
Crystallization Rate ◽  
Complex Viscosity ◽  
Expansion Ratio ◽  
Wood Fibers ◽  
Cell Nucleation ◽  
Composite Foams

Microcellular polypropylene (PP)/wood fiber composite foams were fabricated via batch foaming assisted by supercritical CO2 (scCO2). Effects of wood fibers on rheology, crystallization, and foaming behaviors of PP were comprehensively investigated. The obtained results showed that the incorporation of wood fibers increased the complex viscosity and the storage modulus of the PP matrix. Jeziorny’s model for non-isothermal crystallization kinetics indicated that wood fibers did not change the crystal growth. However, the crystallization rate of the PP matrix was decreased to a certain extent with increasing wood fiber loadings. The wood fiber exerts a noticeable role in improving the cell density and reducing the cell size, despite decreasing the expansion ratio. Interestingly, a “small-sized cells to large-sized cells” gradient cell structure was found around the wood fibers, implying cell nucleation was induced at the interface between wood fiber and PP matrix. When wood fiber loadings were specifically increased, a desirable microcellular structure was obtained. However, further increasing the wood fiber loadings deteriorated the cell structure. Moreover, the crystallinity of the composite foams initially decreased and then slightly increased with increasing wood fiber loadings, while the crystal size decreased.

Foaming of PPC/Wood Fiber Composite Using Moisture Contained in Wood as Blowing Agent

2013 ◽  
Vol 415 ◽  
pp. 631-635
Author(s):  
Li Tao Guan ◽  
Chong Ling Yang ◽  
Na Xin Yuan ◽  
Di Wu Xie
Keyword(s):  
Moisture Content ◽  
Fiber Composite ◽  
Orthogonal Design ◽  
Wood Fiber ◽  
Fiber Content ◽  
Foam Density ◽  
Blowing Agent ◽  
Die Temperature ◽  
The Relationship

The processing of PPC/wood fiber foam composites using moisture as blowing agent was studied in this manuscript. Three important factors, such as: moisture content, wood fiber content and extruder die temperature were investigated with orthogonal design. The relationship between each factor and foam density was revealed, as well as the foaming mechanism was obtained.

Aluminum and copper deposition through the process of thermal flame spray on polypropylene-pine wood fiber composite filaments and their applications

2021 ◽  
pp. 002199832110365
Author(s):  
Sônia MA Veroneze ◽  
Thais HS Flores-Sahagun ◽  
Ramón SC Paredes ◽  
Kestur Gundappa Satyanarayana
Keyword(s):  
Fiber Composite ◽  
Wood Fiber ◽  
Physical And Mechanical Properties ◽  
Heat Treating ◽  
Flame Spray ◽  
Pine Wood ◽  
Thermal Spray Process ◽  
Spray Process ◽  
Copper Coatings ◽  
Study Results

This paper presents a study about polypropylene-pine wood composites, both as filaments and products, coated with aluminum (Al) or copper (Cu), obtained through flame thermal spray process after subjecting the composites to thermal treatments in the second and third step of the study. Results revealed that a previous aluminum layer was needed in order to obtain copper coatings on the composites. The physical and mechanical properties of both metal coated composite filaments were also evaluated and compared with the uncoated composite filaments with and without heat treating these. Consequently, it was observed that the nature of the coating adhesion on the substrates was mechanical, and therefore abrasion blasting of filaments or the use of a higher wood fiber content in the composite improved the Al or Cu adhesion. Also, it was observed that extruded wood fiber/PP filaments should not be cooled in water because pieces might be molded directly once the moisture affects the metal coatings adhesion onto the substrates.

LDPE/MWCNT and LDPE/MWCNT/UHMWPE self-reinforced fiber-composite foams prepared via supercritical CO2: a microstructure-engineering property perspective

2021 ◽  
pp. 105248
Author(s):  
Mohammad Aghvami-Panah ◽  
Mahyar Panahi-Sarmad ◽  
Amir Abbas Seraji ◽  
Seifollah Jamalpour ◽  
Seyed Reza Ghaffarian ◽  
...  
Keyword(s):  
Supercritical Co2 ◽  
Fiber Composite ◽  
Engineering Property ◽  
Composite Foams ◽  
Reinforced Fiber

The Influence of Amount of Wood Fiber on New Flame-Retardant Melamine-Urea-Formaldehyde (MUF) Composite Foam

2011 ◽  
Vol 393-395 ◽  
pp. 1012-1017 ◽  
Author(s):  
Yu Feng Ma ◽  
Wei Zhang ◽  
Ling Li ◽  
Ming Ming Zhang ◽  
Zeng Hui Cheng ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Flame Retardant ◽  
Cell Shape ◽  
Urea Formaldehyde ◽  
Wood Fiber ◽  
Cell Size Distribution ◽  
Composite Foam ◽  
Composite Foams ◽  
Flame Retardant Properties ◽  
Irregular Cell

New composite foams were prepared by co-foaming of Melamine-Urea-Formaldehyde (MUF) resin and wood fiber in the closed mould at 70°C. The effects of amount of wood fiber on mechanical properties, brittleness, flame-retardant, insulation and microscopic structures of wood fiber-MUF foam were investigated. Results indicated that the flame-retardant properties increased, and the brittleness and mechanical properties decreased with the increase of the amount of wood fiber in composite foams. The addition of wood fiber resulted in more uniform cell size distribution and irregular cell shape, but had little effect on insulation properties.

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