2.5″ Line Vac Used In Plastic Part Recovery

I recently worked with an OEM who designed an injection molding machine for their customer. In their design, after the polypropylene parts are formed, they pass through a punch process which creates a scrap piece roughly 1-3/4″ in diameter and 6mm thick but it is very light in weight. The end user was looking for a way to recover these parts in an effort to reduce the amount of waste material in the process but needed an automated solution so they didn’t have to dedicate an operator to manually recover the parts and dump them in the recycle bin. The recovery bin is located close to 25 feet away on the other side of the machining area.

After further discussion,  I recommended they incorporate our Model # 6085 2-1/2″ aluminum Line Vac into their design. The 2.5″ Line Vac has a 2.25″ inside throat diameter which could easily pass the parts and convey them to the collection hopper.

Line Vacs connect to standard ID hose or pipe to create a powerful in-line conveyor

With the recovery bin being located outside of the processing area, they were going to have to run the discharge piping up and over the machines so they were needing something flexible to do so. In addition to the Line Vac, I suggested they use a 30′ section of our 2.5″ conveyance hose. Our conveyance hose is constructed of a durable, clear reinforced PVC, ideal for most general applications and we offer it in 10′ lengths up to 50′, in diameters of 3/8″ to 3″ ID.

Flexible clear PVC hose with smooth bore eliminates material build up.


When it comes to moving dry material, like small plastic parts or more abrasive materials like steel shot blasting media, the Line Vacs are the perfect, maintenance-free solution as they have no moving parts or motors to wear out. For help selecting the best option to fit your needs or to discuss how another product might be suitable for your application, give us a call.

Justin Nicholl
Application Engineer

Super Ion Air Knife Improve Cycle Rates in an Injection Molding Process

A die manufacturer created a 12” wide by 24” long (30.5cm X 61 cm) tool for an injection molding machine that contained 80 cavities for an automotive supplier. As contracted with their customer, the goal was to have 30 injection per minute to create 2400 parts every minute.  The tool was designed with 2 chambers, each containing 40 cavities to control production rates.  Also as part of the contract, the automotive supplier required a pre-production approval before signing off on the purchase order.  As they attached the tool to the injection molding machine for a trial run, they began to notice that some of the parts were sticking to the cavities.  In the first 30 minutes, they stopped the machine as they only averaged 16 injections per minute with only 50% of the parts falling out of the tool.  They did notice that they could feel the static electricity on their arms when they reached into the tool to remove the parts.  To try and improve the cycle rate, they attempted to mount a 12” (30.5 cm) pipe with drill holes above the tool. Many manufacturers attempt this because it is simple and easy to do; but, this style of blow-off is very inefficient and not very effective.  As they began the next trial, they did see a slight improvement.  It increased the cycle rate to 19 injection per minute and it was removing 75% of the parts.  It still was not good enough for the automotive supplier.

Super Ion Air Knife Kit includes Super Ion Air Knife, Power Supply, filter, regulator and shim set.
Super Ion Air Knife Kit includes Super Ion Air Knife, Power Supply, filter, regulator and shim set.

The die manufacturer was under pressure to find a solution as he did not want to redesign or rebuild the tool. He noticed that EXAIR was a leader in Static Eliminators and Blow-off equipment, so he contacted us.  In our discussion, he explained how he needed to remove the static and remove the parts quickly out of the tool.  I suggested our model 111212 Super Ion Air Knife Kit.  It is 12” (30.5 cm) long, and it can be mounted easily across the width of the tool.  With a 40:1 amplification ratio and both positive and negative ion streams, it can remove the static and push the parts very effectively.  Once they installed the Super Ion Air Knife, they began the operation once again.  They initially noticed that all the parts were being ejected from the tool.  When they measured the cycle rate, it was running at 33 injection per minute (exceeding the requirement).  The tool was approved and the die manufacture was very pleased.

When it comes to removing static and blowing parts, EXAIR has a great range of products. We can do it very efficiently, quietly, and effectively.  If you have any issues with injection molding, EXAIR may have the product to help you.  You can discuss your applications further by contacting one of our Application Engineers.

John Ball
Application Engineer
Email: johnball@exair.com
Twitter: @EXAIR_jb

Let’s Talk About Cooling. Yes, In January.

Well, we’re right smack dab in the middle of January, and it’s time for the annual reminder (to myself, mainly) that I surrendered my right to complain about the cold when I moved here from Florida (on purpose) some 24 years (and 2 months, 8 days, and a handful of hours) ago.  Not that I’m keeping track.  You can follow this link (and this one, and this one) to some of my former rantings on the subject.

After an admittedly mild December in Ohio, the struggle became real this week.
After an admittedly mild December in Ohio, the struggle became real this week.

But, as the title implies, I AM going to talk about a need for cooling. Of course, no matter how cold it is outside, there are many, many processes in industry that can get quite hot. Here’s one of them:

A company that operates injection molding machinery had a big problem: their machines’ molds were cooled by chilled water, and as they aged, they developed leaks, allowing water into the mold cavities. This, of course, ruined the product. To make things worse, the passages that the chilled water flows through are cast right into the machine body, so permanent repair essentially means that these bodies (the main part of the machinery) have to be replaced, at significant cost.

Last summer, they went looking for alternate methods of cooling, and found our Vortex Tubes. After some experimentation, they determined that (8) Model 3240 Vortex Tubes (2,800 Btu/hr, Maximum Cooling Power) would replicate the cooling previously provided by the chilled water systems.

EXAIR Vortex Tubes are a quick & easy method to get cold air, on demand, wherever you need it. Just like this.
EXAIR Vortex Tubes are a quick & easy method to get cold air, on demand, wherever you need it. Just like this.

They’ve since outfitted all of their injection molding machines with these, and have dodged a very expensive replacement of machinery for the foreseeable future.

If you’d like to find out how an engineered product from EXAIR’s comprehensive line can take the heat off (literally or figuratively) an application you’re struggling with, give us a call.

Russ Bowman
Application Engineer
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