Wasting Dollars In The Sawmill

We recently found an interesting article by Terence Brown, at one point a member of Oregon State University faculty and a member of the Department of Forest Products. Surprisingly, the document is about 35 years old, yet the messages are are timeless. There are countless inefficiencies and issues that can lead to losses of productivity and profits in sawmills. Everything from wasting valuable parts of each log to unmotivated employees. The ten page article breaks everything down from log storage, to kiln drying, to log sorting – potential problems and solutions mill managers can put into place.

You can read the article here (clicking the link will open a new window).

One area of concern that keeps coming up is proper maintenance of machinery. While this might make sense, the article really stresses that a regular maintenance schedule and proactively dealing with wearing parts will avoid further damage later. But do we really value maintenance as much as we should? Often it seems parts made of premium materials that may cost slightly more than basic plastic parts are not selected: even if they may greatly increase part life and reduce the amount of maintenance required. But it also seems that when times are good (such as with the Canadian sawmilling industry, due to American and Asian demand) and funds exist for maintenance, at times, the pressure to run more logs makes it enticing to let maintenance slide. Unfortunately that increases the potential of catastrophic failure and when that happens you lose control over the situation (as well as profits!).

The solution? Be proactive. If you have a dry kiln, keep extra kiln wheel bushings on hand. Same goes for carriage wheels, chain channel, trimmer lugs and bearing inserts. The panic inspired by our customers when one of our bearing inserts is not in stock is not a fun thing to deal with. Supporting the sawmill industry like we do, we understand our customers frustration when parts cannot be “rushed” fast enough. When a single broken or worn part brings the mill to a halt. Being proactive with your maintenance will go a long way.

For assistance with plastic maintenance solutions for your sawmill please contact us.

 

 

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Redco Polyurethane In Sawmill Applications

Out of all the plastics used in sawmills polyurethane is the most versatile. The material is available from “eraser soft” to “bowling ball” hard and permits a use in a very wide range of applications. A quick overview of the different types of Redco polyurethanes and potential applications:

Redco Deadplate: at 52A this is our softest urethane and is specifically used as a shock-deadener. This is used wherever logs/lumber impact part of the mill and serves to reduce or eliminate wear and damage from impact. Deadplate is commonly sold bonded in a sandwich between two pieces of steel.

Redco 54A: A urethane that has excellent gripping characteristics, it is often used as tires for Redco carry-over wheels.

Redco 6060: Primarily used in applications where impingement is a concern and has limited applications so far in sawmills.

Redco 70A: Can hold heavy load and has high compression resistance. Primarily used as shock and vibration pads.

Redco 80A: Provides a compromise of pliability of the softer urethanes combined with with the high shock, load and vibration tolerances of the harder urethanes. Also used as a carry-over wheel tire material and is excellent in scraping applications.

Redco 430: Perhaps the most well-balanced urethane of all, Redco 430 provides excellent shock, vibration, impact and impingement resistance. At 90A on the hardness scale it straddles the line between rubbers and “plastic” hardness. Used as bumpers, shock/vibration pads, deflector plates.

Redco 500: A slightly harder polyurethane than Redco 430, it has high abrasion and impact resistance. Used in shock, impact and isolation pads and liners and also as wear plate.

Redco 600: Used in applications where deformation of the urethane is a problem and also performs very well in cold weather applications.

Redco 750 and 750 SXL: Bearing-grade polyurethane. Very common in sawmill applications in all sorts of hanger bearings, bushings, sprockets, lugs, bearing inserts and much more. The SXL version is lubricated for dry-running periods.

Redco SPS-2000: Also 75D hardness (same as Redco 750) this is a PULP-SAFE polyurethane designed for kraft pulp applications. It dissolves in the cooking process and makes contamination impossible. Is a substitute wherever Redco 750 would otherwise be suitable.

Why use polyurethane in your sawmill or planar mill? Urethanes bring many useful characteristics to the job:

-Oil, grease and chemical resistance

-Controllable rebound

-Heat, water and low temperature resistance

-Mold, mildew and fungus resistance

-Machinability

 

 

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Redco Titanium – The Ultimate Option

UHMW polyethylene provides numerous benefits in sawmill applications and has several decades of use in sawmills. UHMW has good impact resistance, good wear properties and a low coefficient of friction and helps sawmill and planar mills reduce maintenance downtime thus increasing profits. When regular UHMW needs replacement prematurely in an application or when premium performance is desired Redco Titanium* is there. Redco Titanium is a premium UHMW that is grey in color, it has the lowest coefficient of friction and also takes the most wear and impact. One might assume we only have Redco Titanium available in sheet form; however, we can also provide most of our channel insert profiles in Titanium. Some of our branches even stock their most popular channel profiles in Redco Titanium.

As you might expect, the upfront cost of Redco Titanium is about 50% more than regular UHMW but the benefits of reduced wear and downtime add up. So the next time you are considering channel insert or wear plate or other UHMW parts, consider Redco Titanium as an option. A Redwood Plastics representative would be happy to discuss the suitability of the material to your particular application. For questions or quote request on Redco Titanium material or parts please contact Redwood Plastics.

To view our Redco Titanium literature click here.

*Redco Tivar 88 has similar properties to Redco Titanium and may be suggested by your local representative because of increase availability.

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Double/Triple Saw Blade Carrier

Redwood Plastics’ saw blade carrier is one of our more innovative sawmill solutions: meant to reduce the risk of injury in what is traditionally a dangerous task – transporting saw blades. The carrier’s tear resistant polyurethane design allows for these blades to be moved with less danger the the employee. The standard carrier handles only a single blade but we get asked about multiple blade carriers all the time. We now have an option, the R-33066 Double/Triple Saw Blade Carrier for multiple blades. The carrier can carry blades up to 26″ in diameter. In fact, the mold we use only casts the largest size and while we will modify it to fit the blades you use it is “one price fits all” as we must cast the same amount of material for each carrier. Lead time to ship the carriers is usually 3 weeks as they are manufactured to-order and not a stock item.

For a quotation or to purchase a single or double/triple Saw Blade Carrier – contact Redwood Plastics.

 

Saw blade carrier drawing

 

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The Impact Of Plastics In Sawmills

On this website we often focus on specific applications or plastics used in sawmill and planar mill applications. But we shouldn’t lose sight of the big picture – why are we using plastics in the mill in the first place? Meaning, what are the benefits for you and your operation by switching to plastic?

Firstly, reduced maintenance downtime. Plastics, believe it or not, outwear metal in most applications. You have less breakdowns and have to replace parts less often. We don’t need to tell you how damaging unexpected breakdowns or maintenance can cost your operation. Secondly, plastics reduce noise. They do this because, when you switch from a metal-on-metal application to mating with plastic, the noise gets reduced. Of course there are other benefits of eliminating metal-to-plastic in that you greatly reduce the wear on the metal component when you mate it to plastic. This synergy is seen when you replace metal sprockets with plastic or place channel insert between the metal chain and metal channel. Another benefit of plastics is in the reduction of shock and impact, many plastics are good at absorbing impact, especially Redco polyurethane, which as an elastomeric plastic has many applications in shock and impact reduction. Not only Redco Deadplate but also our fabricated dissipater channels.

Those benefits indirectly save on costs and increase production but did you also know that plastics can also reduce the power consumption of sawmill equipment directly? This is because plastics have a far smaller coefficient of friction chain slides easier and metal doesn’t pull so hard on the plastic. This means less horsepower is required to keep the lumber moving! Plastics are an exceptional addition to modern sawmills and if you have any questions on how plastics might provide benefits to your operations please contact us.

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Redco Hi-Temp Yellow Kiln Wheel Bushings

The Redco Hi-Temp Yellow kiln wheel bushing continues to be tested, and adopted, by sawmills across North America. Compared with the traditional blue nylon bushings, the Hi-Temp Yellows will outwear and outlast the blue bushings. While we cannot guarantee how much longer they last, around 50-100% longer is typical with our current customers, which also means less maintenance and downtime. The robust nature of the bushing’s proprietary kiln wheel plastic means they’re more forgiving if you forget to grease them.

We’ve tested them in a mill running them without any grease for two months and they showed no wear. Using them this way is not recommended, but it shows you how strong these bushings are. This has been a three year project by Redwood Plastics to develop a superior kiln wheel bushing to the blue. The bushings can be supplied as the simple grease groove-less version or with a 1/4″ grease groove (does not affect price). Lead time is usually 3-4 weeks to ship from your local branch. Please note these are not a replacement for the phenolic (laminate/Micarta) higher-load bushings.

For more information or a quote on these Hi-Temp Yellow Kiln Wheel bushings or our other sawmill parts please contact us today.

Safe_Yellow_Kiln-238x300

 

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Custom Channel Insert

Chain channel insert is one of the most common plastic applications in sawmills. With good reason: the channel insert extends the life of chain, reduces the horsepower required to pull the chain and thus reduces maintenance downtime. Plus, compared to other plastic maintenance solutions, it’s quite inexpensive. But did you know Redwood Plastics can supply custom channel insert? In fact, we do so quite often as our standard extruded profiles do not meet all of our customer’s needs. The reason for a custom profile could be for one of two reasons:

1.) Existing profiles do not work for the customer’s chain or needs.

2.) The customer wants a better grade of UHMW than reprocessed but the needs are too low for a custom run of extruded Redco Titanium channel insert.

The process our branches will use is called “dado” cutting where a number of blades are placed in a bit side-by-side to shave down the channel. While this works fine for channel insert it does mean the channel will have a different finish and not be as smooth as the extruded profiles. However, it does work well and is an economical solution usually adding about 25% to the cost of the channel insert based on equivalent material. So a custom reprocessed channel insert will tend to end up around 25% more than an extruded profile off the shelf.

Where the pricing (and performance) really changes is when you do custom channel out of products like Redco Tivar 88 or Titanium. The materials’ performance is comparable, but availability may offer significant savings on price and lead time as some of our branches will stock some Titanium and others choose to stock Tivar 88. In these cases, the channel insert can cost 4-5x as much as the reprocessed; however, the performance benefits are great with additional savings on horsepower and both longer chain life and less replacement of the channel insert itself.

For more information on our standard or custom channel insert profiles please contact us.

Picture below is of a dado cut custom channel insert.

Dado_Finish2

 

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UHMW Wear Strip

UHMW wear strip is a common plastic application for sawmills but not all wear strip is the same. The basic wear strip is probably black-reprocessed UHMW because not only is it a cost-effective solution, but the manufacturing process actually makes the reprocessed UHMW more wear resistant than natural! An additional benefit is that reprocessed UHMW is widely available. For premium wear strip Tivar 88, which is actually a lining-grade UHMW that is both cross-linked and glass-filled is commonly specified. However, Redco Titanium is very similar and interchangeable in this application to Tivar 88. At Redwood Plastics, some of our branches stock Tivar 88 and some stock Titanium – so you may request one and be asked if we can substitute the other. Finally, Redco Synsteel and SPS-2000 (which is a polyurethane, not UHMW)  may be specified for kraftmill or pulp-safe applications. Wear strip can be supplied cut and pre-drilled along with weld washers and plugs (if desired). Just send us those drawings!

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Redco 750 S.N. Bearing Inserts

bearings_inserts-75D

Redco S.N. Bearing inserts were originally designed as a short-term replacement for standard cast iron housings. But made from durable Redco 750 polyurethane our customers have taken these inserts to be a permanent solution now at many sawmills. The bearing inserts perform better than the iron and are quick and relatively inexpensive to replace. Also, unlike most of solutions that are manufactured as required, we usually carry the most common bearing inserts in stock. Originally, this was because the inserts were intended to be a part that would need to be purchased quickly to reduce downtime; however, our customers do appreciate the next day shipment they get many times with the inserts. The bearing inserts are a floating bearing and a locking device is required.

A table with the popular sizes is below. If you have any questions or would like a quote please contact Redwood Plastics (Please let us know the quantity of inserts needed and the shaft dimensions).

Bearing_Insert_Dimensions

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Tivar 88 Wear Strip

When considering new or replacement wear strip in your sawmill or planar mill, Tivar 88 UHMW should be considered*. Many long-time customers of Redwood Plastics already request Tivar 88 after years of excellent performance in their sawmills. Traditionally, cheaper reprocessed-black or natural (white) UHMW is used in wear strip applications; however, Tivar 88 has several properties that make a great substitute. Tivar 88 was developed for aggressive lining solutions and is often seen in various hoppers and chutes in a wide variety of industries: everything from moving agricultural goods such as seeds and grain, to fly ash, to aggregates such as rock. Tivar 88 is glass-filled and cross-linked. The glass-filled provides a more robust, dimensionally stable UHMW material when compared to natural or repro-black. Cross-linking is an additional step in the production process where the UHMW on a molecular level entwines and bonds in very long chains. This provides higher strength and wear properties.

As a premium material, you can expect an approximate 30% price premium for this option. But the benefits to production and decreased downtime make the switch to Tivar 88 well worth it. For your questions on this product or if you would like a quotation on your wear strip needs, please contact us today.

*Redco Titanium is a very similar material that can be substituted for Tivar 88 in sawmill wear strip applications.

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