TL-119

 

A Teledyne Halco portable fluxer unit

with a Vanton close-coupled,

self-priming Flex-i-liner® pump.

Close-up view showing compact

Flex-i-liner® positioned in fluxer

cabinet.

Block and Liners of varying material.

Flex-i-liner® pumps are available in a

variety of engineered rigid plastics and

elastomers enabling them to safely

handle just about every corrosive or

hazardous fluid over the full pH range.

The most common materials are shown

here. (Top row, left to right);

Polyethylene body, Viton liner;

reinforced Teflon body, Hypalon liner;

Polypropylene body, Natural Rubber

liner; (Bottom row) Polypropylene body,

Buna-N liner; Carbon- Filled Teflon

body, Neoprene liner; Teflon body,

Nordel liner.

Pumping Solder Flux

INDUSTRY:

ENTITY:

SOLUTION(S) PUMPED:

PUMP TYPE(S):

Chemical

Teledyne Halco

Hydrochloric acid, Solder flux

FLEX-I-LINER Sealless Self-Priming Peristaltic Pumps

 

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Reprinted from PUMPS AND SYSTEMS MAGAZINE

 

Unique plastic pump distributes solder flux onto

printed circuit boards

 

Pumping solder flux that contains 5% hydrochloric acid is a troublesome

service. A unique plastic pump that uniformly distributes the flux onto

printed circuit boards (PCBs) is critical to the performance of the

horizontal solder leveling system developed by Teledyne Halco.

 

Specifications call for uniform coating and metering of the aqueous flux

as the PCBs move by on a conveyor at 30 feet/min. The pump, which

operates continuously during eight-hour shifts, is designed so that only

two non-metallic parts are in contact with the ethylene-glycol based

flux.

 

The Unicote® Horizontal Solder Leveling System is said to deliver the

tighter hole tolerances, surface thickness, and uniformity of application

that today's surface mount technology demands. On identical SMD pad

configurations with solder thickness of 200 to 300 millionths of an inch

at the crest, deviations of 50 to 60 millionths of an inch are typically

achieved on 50 pitch and smaller.

 

The solder fluxer is a mobile, compact roller coating unit designed to

apply flux formulations as specified. It is constructed as a

polypropylene box frame with compartments for the pump and supply

tank, both of which can be readily accessed.

 

The fluxer has three sets of conveyor rolls. The first and third sets run

dry and are intended only for conveyance. The second set, constantly

flooded by fluxing liquid, serves as the applicator in addition to

providing conveyance. The rollers are designed with an inner core to

provide rigidity and dimensional stability. Their outer surface is bonded

to a thin-walled plastic tube. The entire roller coating assembly rests in

a compartment at the top of the fluxer. The compartment serves as a

drain conduit, returning excess flux to the supply tank below. A

platform is provided directly under the chamber for the flux circulation

pump, which must be self-priming and draw the flux from the supply

tank for continuous, uniform distribution through manifolds to the

circuit boards.

 

The Pump

 

The pump selected for this operation is a close-coupled Vanton

Flex-i-liner® self-priming polypropylene pump with a flexible neoprene

liner. It has no stuffing box, glands, shaft seals, check valves, or gaskets

and it is completely sealless. The plastic components are totally

resistant to the flux, and the design is ideal for handling viscous

materials. Fluid flow is confined to a channel formed by the outer

surface of the flexible body block or pump casing. All mechanical

action and moving parts are within the liner and are not exposed to the

corrosive fluid. Movement of the fluid is controlled by a rotor mounted

on an eccentric shaft that oscillates within the liner, creating a

progressive "squeegee" action on the trapped fluid. The liner and pump

casing are the only parts in contact with the pumped fluid, eliminating

any danger of contamination. The model selected for this service is a

size 12, which has a capacity of two gallons per minute. It is driven by a

¼ Hp, totally enclosed electric motor operating at 1,450 rpm at 50

cycles (1,750 rpm at 60 cycles).

 

In addition to dependable, uniform operation, a significant feature of this

pump is the ease with which it can be maintained and serviced. The

only wearing part is the low-cost liner, which can be replaced in a

matter of minutes without special tools. In addition, the pump can be

run dry for extended periods without harm.

 

Teledyne Halco's Horizontal Solder Leveling Systems are recommended

where high production rates are required on relatively thick boards

(typically 0.062 in.), 18 in. x 24 in. Dwell time of the entire board as it

passes through the 6 in. chamber is less than two seconds.

Exploded view of Vanton pedestal mounted

Flex-i-liner® pump showing basic

simplicity of construction. No seals.

No packing. No valves. No gaskets.

Only two chemically inert parts — the

flexible liner and body block — are in

contact with the fluid.

Copyright 2016 - Vanton Pumps (Europe) Ltd - All rights reserved

About Us

In the 1950, Vanton developed a revolutionary all-plastic pump for use in conjunction with the first heart-lung device. The design limited fluid contact to only two non-metallic parts: a plastic body block and a flexible liner. This was the birth of our Flex-I-Liner rotary pump. Its self-priming sealless design made it an industry standard for the handling of corrosive, abrasive and viscous fluids as well as those that must be transferred without contaminating the product. Vanton now offers the most comprehensive line of thermoplastic pumps in the industry.

 

 

Stay in touch

mail@vantonpump.com

(+44) 01260 277040

Vanton Pumps (Europe) Ltd.

Unit 4, Royle Park

Royle Street

Congleton CW12 1JJ

UNITED KINGDOM

www.vantonpump.com