2 Simple Reasons To Switch To Plastic Sprockets

Plastic sprockets primarily made of polyurethane but sometimes nylon have been part of the sawmill industry for years and are proven in this application. But there are still many sawmills where metal sprockets are used. If your sawmill is one of those, there are two very good reasons to make the switch over to plastic!

1.) Increased chain & part life

Quite simply, mating a softer plastic sprocket to your chain will make both the chain and the sprocket last much longer. Metal-on-metal wear is a major maintenance headache and a switch to plastic  is an easy way to avoid premature wear of your parts – and save you money!

2.) Noise reduction

Depending on what country or region you’re in, noise may be a key concern at your saw mill. Specifically, noise reduction to meet certain regulations. Metal on metal contact is loud and a change to plastic sprockets will reduce noise and therefore assist in your overall noise reduction plan.

For more information on plastic sprockets, contact Redwood Plastics.

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Shark Fin Replacement Parts

Do you have a Shark Fin system? Has the old maintenance hand at your mill left you without knowing where to get replacement parts? For over a decade Redwood Plastics has been the exclusive manufacturer of the Shark Fin Board Turning System and is your source for replacements. Anything from Shark Fin lugs to sprockets, chain channel, or complete turner systems can be supplied on an approximately 3 week delivery. Important information to have on hand when you contact Redwood Plastics:

  • Color of lugs needed
  • A picture & measurements of the lug (there have been several models over the years)
  • Size of turners (15.5″ or 17.5″)
  • Are the turners optimized for softwood or hardwood (if known)?

For more information on Shark Fin replacement parts, or the value of a new Shark Fin system for your sawmill, contact Redwood Plastics.

For more information on the Shark Fin Board Turning System visit www.sharkfinsystems.com

 

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Rulon & Nylon Team Up For New Dry Kiln Fan Bearing

Recently one of the sawmill experts with Redwood Plastics started a test for a superior dry kiln fan bearing. Typically the standard bearings for the application are ~$1300.00 and we were asked to come up with something better and less expensive. Originally Redwood Plastics’ standard material for this application (Redco 750 polyurethane) was considered but was expected to deform under the high heat and friction the bearings will be subjected to. A bearing engineer was consulted and Rulon LR was found to be the optimum material; however, to machine a bearing of the size required for this application out of Rulon would be prohibitively expensive.

Instead, a decision was made to machine a bearing housing out of 30% glass filled nylon which, due to the glass content, has much higher dimensional stability at elevated temperatures. The Rulon LR was still used, except as an insert on the ID of the bearing. Because the customer was using an “auto lube” system grease grooves were machined on the Rulon – but for the record, Rulon can run completely “dry” in most applications! A test with ten of these new bushings is under way and after all this work – they did end up less expensive than the traditional bushings.

A picture of the application:

Rulon_Kiln

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Pulp-Safe: More Important Than Ever

Contamination is an issue in many industries. But with how quick information travels with social media and mass media these days even a small contamination issue can lead to a disproportionate amount of bad PR.  In the case of pulp mills a single incident of contamination could be a disaster resulting in entire shipments of product having to be discarded with a huge financial cost. Simple fact is you cannot have contamination in pulp and you need to use materials in your production and maintenance processes that will cause contamination issues.

Some pulp and paper mills still use plastics which are not pulp-safe. The reason being that pulp-safe options are either not known to the customer, or financial considerations influence the choice to go with materials that are not pulp-safe. Pulp-safe plastic may be more expensive than more readily available alternatives; however, a single contamination incident will erase any savings you would have earned going with the cheaper material.

There are two main types of pulp-safe plastic available.

Redco Synsteel: This is a pulp-safe UHMW with a specific gravity > 2. Synsteel will trigger metal detectors, is magnetic, has a melting point > 180 degrees, and twice the compressive strength of natural UHMW. Synsteel comes in 4′ x 10′ sheets from 3/8″-2″ thick. For more information visit the Synsteel webpage here.

SPS-2000: This polyurethane product is available in a 75D hardness and is kraftmill safe. SPS-2000 dissolves completely in the cooking process and leaves no chance of contamination. It has the additional benefit of having the lowest coeffecient of friction among Redco Polyurethanes. Visit the SPS-2000 webpage here.

 

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Product Spotlight: CJ Composite Bushings

Plastic bushings and bearings have several decades worth of success in sawmill applications but these are usually nylon, polyurethane or UHMW bushings. Redwood Plastics is trying to introduce the more advanced composite bushings into sawmill applications. The composite bushings have several advantages, with their filled PTFE liner they are much slicker than other bearing choices available. Labor costs on machining are saved because the bearings are only available in “drop in” form, already complete, and replacing another material such as brass. These bearings are called CJ or “composite jacket” referring to the hard composite shell of the bearing.

CJ bearings supply several advantages to applications:

-High-load capacity/high-shock load capability.

-Accommodates incredible compression loads that literally crush competing composite materials.

-Self-lubricating design.

-Provides maintenance-free operation and eliminates the need for costly and messy greasing systems.

-Reduces wear and extends operating life. Coefficients as low as 0.05 in dry applications and <0.009 in lubricated environments.

-Temperature resistant: operates flawlessly in temperatures ranging from cryogenic levels to a high of 300°F (149°C).

-Dimensionally stable in fluids (water and corrosive liquids). Absorption rates are negligible, providing near-zero swell.

-Chemical resistant: compatible with a wide range of lubricants and media.

-Suitable for press fit, freeze fit, epoxy bonding, as well as conventional mechanical retention.

-Low weight/high strength.

-Accommodates high-load with a compact strength to weight ratio.

-Drop in replacement for metal or bronze bearings.

For information on these CJ bearings and how they might reduce your downtime and increase your profits, contact Redwood Plastics.

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Wind Powered Dutch Sawmill

This is a piece more about curiosity and fun rather than cutting-edge sawmill technology. We stumbled across an article and some videos about a wind powered sawmill in the Netherlands. It’s amazing to see this old mix of wooden gears and cogs work together to power the blades. Since wind is in control, the windier it is, the more power (and higher speed) for the blades. Even the winch to drag the logs up from the river is wind powered. The approximately 8 minute video is neat because it explains the mechanics on how the whole thing works. Overall, it has a rustic and almost childlike appeal to those interested in sawmill technology and rudimentary technology. You can see the video embedded below:

 

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Stop Shock With Redco Deadplate

If you are experiencing shock issues anywhere in your mill operations where logs or lumber are impacting equipment then you need to consider a Redco Deadplate solution. Redco Deadplate is a variety of polyurethane specifically for shock-absorption applications and is primarily used in sawmills. The application commonly takes place where logs or lumber impact part of the conveyor and change direction. This impact for hours each day without Deadplate can cause shock and vibration which damages equipment.

Redco Deadplate is commonly supplied in a sandwich made up of three parts. The point of impact is the “face plate” and this is usually 3/8″ or 1/2″ thick Redco 500 polyurethane or steel. The middle part of the sandwich is the Deadplate itself and then there is a backing plate usually 3/8″ or 1/2″ steel. All three components are bonded together. The cost of a Deadplate solution varies, typically running between $2000-$3500 per sandwich. For more information on the Redco Deadplate product click here.

To request a quote for your Redco Deadplate click here to contact Redwood Plastics.

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Redco Saw Blade Carriers – FAQs

The new model Redco Saw blade carrier has been on the market for a couple years and has received a very positive response. The saw blade carriers are manufactured out of quality Redco polyurethane and are the result of years of research and planning into the best way to make this important safety product. As we quote more and more of this product we have started to receive a few questions that keep coming up and we hope to help you out right here:

 

What is the maximum size saw blade that the carriers can hold?

26″ in diameter at this time.

 

What are the standard saw blade carrier sizes?

The product is actually molded every time for a 26″ diameter blade. We simply cut the blade-holding polyurethane to size. The smallest size the carrier can reasonable hold is a 16″ diameter blade.

 

What are the prices?

Due to differences in freight to land the product at our branches, quantity, currency of the customer’s market, the price varies. Contact us for a quote. However, because the product is always molded for the maximum size of 26″ diameter the cost of the carrier is the same no matter what diameter we cut it to. In essence, we are simply cutting a 26″ carrier down to size but a 26″ carrier still needs to be made.

 

Are there versions of the carrier that hold multiple blades?

Yes, there is a “Double/Triple” model that can hold up the three blades. It is very similar to the single bladed carrier except the groove in the blade-holding polyurethane is wider.

 

Does the “Double/Triple” carrier cost more?

No, the simple change to adapt the carrier to hold multiple blades means this model costs the same as the single.

 

Do you have local distributors for the Redco Saw Blade Carrier?

Redwood Plastics is the distributor. The Redwood branch serving your state or province would be the ship-to/pick-up point for the product.

 

What is the delivery time to get one?

Usual lead time is 2-3 weeks to ship.

 

What are the saw blade carriers made out of?

Redco polyurethane of various durometers. Harder durometers for the handle and standing base, softer for the actual blade carrying portion.

 

Are the blade carriers made for saw blades outside of the sawmill industry?

If the blade can fit the carriers than yes. An important note is for blades in the food service industry, such as butcher’s blades. The standard polyurethane is not food-safe; however, we can supply a “food safe” saw blade carrier. We have not had the carrier itself FDA tested but the material itself would be FDA approved.

 

If you have more questions about the Redco Saw Blade Carrier or would like a quote, contact Redwood Plastics here.

 

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Micarta Isn’t A Material

One plastic that sometimes confuses customers in sawmills is “Micarta”. First of all, Micarta is just a brand name – it isn’t a type of material. What Micarta in sawmills usually refers to is a very rigid, high-load bearing “industrial laminate”. These laminates are a very large family of plastics. They break down into five different types of resin, and then three types of thin substrate (canvas, paper, or glass) which is then layered into a sandwich of substrate and plastic resin. While the common term in the sawmill industry is to call this material “Micarta” referring to a popular brand, but people in the plastics industry would call this “phenolic”. Plastics have a reputation sometimes of being easy to deform under heat and/or pressure: but phenolic/Micarta does not have this problem. Two main grades are used in sawmill applications.

“Micarta CE” or equivalent is the standard mechanical grade. It is used for simple, mechanical applications where high strength and little deformation is desired. It is widely available and fairly inexpensive and is pictured in the featured image for this article entry (look for the brown board beside the saw blade in the picture). We also see Micarta BL400 (graphite filled) often used by sawmills. This graphite filled type holds its shape even better, wears less, and is excellent in applications such as saw blade guides. Another application for these industrial laminates is as very high load bearing kiln wheel bushings (as a replacement for nylon). You can find more information on these materials here.

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Canadian-US Softwood Lumber Dispute: The Basics

The fall of 2016 is going to be an interesting time for the North American sawmilling industry. The 2006 agreement on softwood lumber between the two countries has expired and the U.S. may elect to go through litigation as of October of this year. This is a long, complicated dispute that has stretched over 30 years at this point and has the potential for flare-ups in the near future. Since this issue is so important to sawmillers in both countries, we would be wise to examine the history and context of this long-running trade dispute*.

The Nutshell:

At its core the dispute revolves around perceived unfair subsidies the Canadian sawmilling industry gets because Canadian lumber mostly comes from forests owned by the government. Therefore the “stumpage fee” is not set by the marketplace but by the government. The United States sees this as a subsidy and worthy of a countervailing duty tariff to bring Canadian lumber pricing up to market price. Canada disagrees, primarily arguing that countervailing duties are only against specific industries whereas “trees” can be used for many industries.

The Context:

For much of the timeframe during the dispute the Canadian dollar has been lower than the U.S. dollar making Canadian lumber that much more attractive to U.S. markets. As of 2015 the U.S. imported 69% of Canadian lumber (China held most of the remaining market share).

Although there were flare-ups of the dispute, first in 1982, then 1986 and 1991 starting in 2002 was the most notable phase of the dispute. For the first time the U.S. accused Canadian producers of “dumping” product on the market. A combined duty over 27% was levied on Canadian softwood, which hit the industry hard. The dispute was brought to World Trade Organization litigation where that although Canada won some hearings, the WTO did stress that Canadian policy led to financial burdens on U.S. producers. Finally in 2006 a softwood lumber deal was reached and renewed until it recently expired. Under the current framework duties were leveraged when the market price of softwood hit certain levels.

The Future:

A negotiation framework has yet to be set. Publicly, both parties are stressing negotiation but the U.S. side has made it clear that increased duties may be needed as they argue the lumber market has changed significantly since 2006. The “wild card” in these negotiations this time around is Canada’s stake in the U.S. lumber industry itself, as since 2006 Canadian lumber companies have bought a significant stake in U.S. sawmills. To put it in perspective, in 2006 Canadian lumber companies owned two U.S. sawmills. Now that number is forty.

*The facts in this article were sourced from the Wikipedia article on this dispute and its various links. A link to that article can be found here.

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