Today's KNOWLEDGE Share:Packing Pressure:

-

Today's KNOWLEDGE Share:

Packing Pressure:

The final (true not apparent) density of a molded polymer is not packing pressure dependent.


Your packing pressure will allow you to compensate for shrinkage by compressing the melt in the cavity. As a transient, you will indeed increase the melt density as you pack.


But at the end of the process, after ejection and cooling, the part density will be controlled by the polymer thermodynamics, not by the process.

So packing will change the part volume, the weight, the thickness along the flow, and dimensions in general, but not the material density.

Well, to be very precise, in crystalline materials pressure may influence crystallization (one way or the other in fact) leading to relatively small density variations.

But if we look at amorphous materials for the sake of simplicity, disregarding voids and associated apparent density, the actual material density will be the same near or far from the gate, with a lot or very little packing !


Source:Vito Leo

Visit MY BLOG http://polymerguru.blogspot.com


#plastics #plasticsindustry #injectionmolding #cooling #packing #pressure #crystallization #amorphous

Comments

Post a Comment

Popular posts from this blog

Today's KNOWLEDGE Share:PLA BOTTLE

-
Image
Today's KNOWLEDGE Share Ever wondered how we can reduce plastic pollution in India? The Mysuru-based Defence Food Research Laboratory (DFRL), affiliated with the DRDO, has launched an eco-friendly remedy with the introduction of biodegradable water bottles. Crafted from sustainable Polylactic acid (PLA) material, these bottles not only combat plastic waste but also contribute to reducing the overall carbon footprint. The best thing about this bottle is its all-encompassing sustainability approach – the bottle, cap, and label are all compostable. This innovation, derived from 100% bio-based and renewable sources, sets us on a path towards environmental conservation and fosters a greener and more sustainable future. Source:The Better India #polymers #bioplastics #pla   #compostable   #ecofriendly   #sustainability
Read more

Today's KNOWLEDGE Share :Floor Tiles with Cellulose Microfiber

-
Image
Today's KNOWLEDGE Share Mitsui Chemicals & Partners Create Floor Tiles Comprising of a Cellulose Microfiber The three partners have created floor tiles made of Transwood™ with Prasus™ a fully bio-based composite that combines a cellulose microfiber compound with Prasus™ a mass-balanced bio-polypropylene resin produced by Prime Polymer. New Building Material Selected for use in Flooring of an Event Facility The new building material was selected for use in the flooring of an event facility for Expo 2025 Osaka, Kansai, Japan (Expo 2025): the EXPO National Day Hall, which has been designed by Akihisa Hirata Office, among others.Mitsui Chemicals has decided to provide sponsorship for Expo 2025 in the form of supplying the 20,000 floor tiles each measuring 15 centimeters square required for the facility. In providing these biomass-based floor tiles,Mitsui Chemicals aims to express its endorsement of the theme of Expo 2025,Designing Future Society for Our Lives,and help to ensure tha...
Read more

SABIC OPENS MULTI- MILLION-DOLLAR ULTEM™ RESIN MANUFACTURING FACILITY IN SINGAPORE

-
Image
SABIC, a global diversified chemicals company, today announced the official launch of its new US$170 (S$220) million ULTEM™ resin manufacturing facility in Singapore, marking the company’s first advanced specialty chemical manufacturing facility in the region producing the high-performance thermoplastic, ULTEM™ resin. The new facility is a strategic move to support SABIC’s goal of increasing global ULTEM™ specialty resin production by more than 50%, responding to the growing demand from high-tech and manufacturing industries in the Asia-Pacific region, including Japan and China. The facility opening was officiated by Ms. Low Yen Ling, Senior Minister of State for the Ministry of Trade and Industry (MTI) and Ministry of Culture, Community and Youth (MCCY), Eng. Khalid H. Al-Dabbagh, Chairman of the Board of Directors of SABIC, Eng. Abdulrahman Al-Fageeh, SABIC Chief Executive Officer, and Mr. Omar Al-Harthi, Deputy Head of Mission, Embassy of the Kingdom of Saudi Arabia in Singapore...
Read more