Adhesive System Ends Stress Cracking in Catheter Assembly

March 27, 2001
/ Print / Reprints /
ShareMore
/ Text Size+
The manufacturer of this flexible catheter assembly benefited from a UV-cure system that eliminated solvents and stress cracking.
This soft, flexible catheter uses a “peel away,” splitable-needle introducer, a unique catheter insertion system for fragile veins. After insertion, the needle’s wing assembly is split apart and discarded, eliminating the need to repeatedly re-stick the patient.

The manufacturer was dissatisfied with the process used to bond the stainless steel needle halves to lightly tinted polycarbonate wings. A “solvent cocktail,” made by combining a plastic, such as PVC pellets, and adding solvent, to make “glue,” was being used. Formulation inconsistency, stress cracking and toxic solvent fumes were growing concerns.

The solution, Loctite® 3211 medical device adhesive, was specified along with a Loctite® light-cure chamber. The combination proved superior in every way — eliminating stress cracking while reducing rejects due to the solvent cocktail’s inconsistencies.

Typical Applications

Loctite 3211 is primarily designed for bonding polycarbonate to itself, while not inducing stress cracking under typical molded-in stress levels. Its flexibility enhances the load-bearing and shock-absorbing characteristics of the bond area. The adhesive has also shown excellent adhesion to a wide variety of substrates including glass, many plastics and most metals.

Typical Curing Performance

Loctite 3211 is a one-component, thixotropic adhesive that cures rapidly to form flexible, transparent bonds when exposed to ultraviolet radiation and/or visible light of sufficient intensity. The cure rate and ultimate depth of cure will depend on light intensity, the spectral distribution of light source, exposure time and light transmittance of the substrates.

Additional information on Loctite 3211 and the Loctite light-cure chamber is available from Loctite Corp., 1001 Trout Brook Crossing, Rocky Hill, CT 06067-3910; telephone 860-571-5100; fax 860-571-5465; or visit the Web site www.loctite.com

Sidebar: The Benefits of Light-Cure Technology

The many benefits of light-cure adhesives and curing systems make them ideal for assembly operations that require fast processing speeds and low-cost, reliable bonds. They provide:

Speed of Cure — With typical cure times from 2 to 60 seconds, manufacturers can dramatically increase throughput, reduce in-process inventories and lower overall processing costs.

Structural Bonds — High-strength bonds may be achieved.

Substrate Versatility — The latest advances in light-cure technology allow manufacturers to bond even a wider range of substrates than before, including plastics containing UV blocking agents, as well as difficult substrates such as polypropylene and polyethylene.

In-line Quality Assurance — Instant cures allow for 100% in-line inspection, eliminating costly off-line quality checks.

Solvent-Free Formulations — for a safer work environment.

Cure on Command — allows time to align parts precisely prior to cure.

Minimal Space and Energy Requirements — Unlike heat-cure epoxies that require large thermal ovens that are expensive to operate, light-cure systems require little space and consume minimal energy.

Easy to Automate — Fully automated dispensing and curing equipment is available to support most any production requirement.

Did you enjoy this article? Click here to subscribe to Adhesives & Sealants Industry Magazine.

You must login or register in order to post a comment.

Multimedia

Videos

Image Galleries

ASI April 2014 Photo Gallery

Our April 2014 issue is now available!

Podcasts

ExxonMobil Tackifier Expansion

Dwight Tozer, vice president of ExxonMobil’s Adhesion Industry business, discusses the company’s latest tackifier expansion project with Editor-in-Chief Susan Sutton.

More Podcasts

Adhesives & Sealants Industry Magazine

ASI July 2014 cover

2014 July

Our annual Distributor Directory helps you locate a distributor that best suits your needs. Check it out today!

Table Of Contents Subscribe

THE ADHESIVES STORE

handbook-sealant-tech.gif
Handbook of Sealant Technology

The Handbook of Sealant Technology provides an in-depth examination of sealants, reviewing their historical developments and fundamentals, adhesion theories and properties, and today’s wide range of applications.

More Products

ASI 2014 Buyers GuideASI's Buyers' Guide

Annual purchasing resource for equipment used in the manufacture/formulation of adhesives, sealants, pressure sensitives, tapes and labels and for application of finished adhesives. 

Clear Seas Research

With access to over one million professionals and more than 60 industry-specific publications, Clear Seas Research offers relevant insights from those who know your industry best. Let us customize a market research solution that exceeds your marketing goals.

STAY CONNECTED

facebook_40px twitter_40  youtube_40pxlinkedin_40 google+ icon ASI 30px