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JW Latex Consultants (and Rubber Consultants,乳胶顾问) offer solutions to your problems in Natural Rubber latex and Synthetic Rubber latex processing and the manufacturing of latex products (condoms, catheters, medical gloves, baby teats and soothers, toy balloons etc) Quick answers through e-mails are possible at reasonable cost.

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Send Your Enquiry and Orders To: woonsungliang@yahoo.com.sg

Problem Solving Through E-Mails with John Woon Latex Consultants Is Possible
可以通过电子邮件与JW乳胶顾问来解决问题

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Thursday, September 15, 2011

Chinese, Malaysian Companies in Joint Venture

The Straits Times/Asia News Network reports that two Chinese companies, Mazhongdu International and Hainan Baisha Industrial, have teamed up with a Malaysian firm, Hateg, for a rubber production joint venture in Indonesia, in what is said to be a 3.5-billion-ringgit ($1.14 billion) investment over the next five years.

The first phase of the project in Kalimantan will cover 1,000 hectares over a year at a cost of 40 million ringgits, while another 40,000 hectares will be planted over five years after that. The joint venture partners are also in discussion to expand the plantation to 200,000 hectares, which will bring the total investment to about 8 billion ringgits.

Probelms with Latex Dipping of Vascular Catheters

Manufacturer:   I am an Engineer from a vascular catheters manufacturer. I found your blog (http://latexconsultants.blogspot.com) during my search for answers to the problems I am facing with my rubber manufacturing process and have found the information on the blog site very useful. However, I still have questions and I hope you will be able to give me some advice based on your technical expertise on rubber manufacturing and many years of experience. This is my first time working on rubber manufacturing and I have little knowledge in this aspect.
I am recently working on my own coagulant mixture of Calcium Nitrate plus Methanol and have used it to dip with natural dipping latex. However, I have been finding extremely bulky tip immediately after the formers have been removed from the latex tank. I have tried adjusting the dipping speed, only to find the same results. I have also adjusted the dipping duration for the coagulant, with similar end results. Is the Calcium Nitrate that I have added too little?
I am also facing balloon recovery issues on my balloon after inflation. What are the possible reasons for recovery problems?

John Woon (Senior Latex Consultant): 
Here's my comment and recommendation:
1) At first I thought what you meant by "bulky tips" was the effect of excessive pick up of either the coagulant or the latex at the tip on withdrawal for the formers from the two respective tanks. However, your photos show that it was the narrowing of the areas just below the tips making the tips appearing bulky and thicker.

2) Anyway, let's assume that it was in fact due to excessive pick up of either coagulant or the latex. To overcome this problem, you have to withdraw the former at a lowest possible speed.

3) Formers should be heated to higher temperature to ensure faster drying of the coagulant. You are now using 37C. Please try 45C. Faster drying of the coagulant would help to "set" it before it has a chance to flow back when the formers are inverted after withdrawal. Excessive flow back might result in thinning of the coagulant and hence latex pick-up as seen in the photos.

4) Ensure the formers are well cleaned (with detergent periodically) after each cycle of dipping. This is to ensure even coating of the coagulant.

5) Add about 0.1% of a non-ionic surfactant as a wetting agent in the coagulant. Triton X100 and Teric 320 are possible examples.

6) For health reason, do not use methanol which is highly toxic. It has been reported that workers who are repeatedly exposed to methanol could suffer from eventual blindness. Replace it  with ethanol or IPA (Isopropyl alcohol)

7) Poor recovery of the balloons after inflation and deflation could be due to insufficient drying of the balloons and also low modulus of the film. Prevulcanized latex is available commercially in three modulus ranges, namely low, medium and high modulus. I suggest you use either the medium modulus grade or a 50/50 blend of medium modulus and high modulus.

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What has the bouncing ball to do with tyres?

Latex Gloves Educational Articles from the Malaysian Rubber Export Promotion Council

How do you select your medical gloves?

Rubber Chemicals: Carcinogenicity, Mutagenicity, Clastogenicity.

Why is Compression Set measurement important?

Assessment of Latex Stability

Joule Effect

Poor Flocking Quality Of Household Gloves

Creaming of Latex

What is Vulcanization?

History of Latex Dipped Products

Applications of Prevulcanized Latex

Defoamer Creating Havoc in Glove Factory

Problems With Milling Rubber Chemicals

Medical Gloves From Guayule Latex

Introduction to SMG Gloves

 

 

Click on The Following Links to Read More Articles:

[Advantages of Vulcanization] [Applications of PV Latex] [Bacteria and Latex] [Chemical Toxicity] [Cross-Linking Density] [Biodegradability] [Black Articles] [Blooming] [Bouncing Ball] [Compression Set] [Condoms] [Creaming] [Defoamer] [FDA] [Fatty Acid Soaps] [Flame Retardant] [Flocking] [Food Packaging] [Glove Demand] [Glove Selection] [Guayule Latex] [History of Gloves] [Joul Effect] [Latex Stability] [Latex Thread] [Milling Problem] [MREPC Articles] [Nano Polymer Particles] [Nano ZnO] [Polychloroprene] [REACH] [SMG] [Storage Hardening] [Vulcanization] [Vytex] [Yulex]

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