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November 2018

The Moisture-Resistant Factor Of Plywood

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Moisture content is an essential factor that qualifies the quality of plywood. Therefore if the volume of moisture is less in the material, then the plywood would be brittle but if the water volume is high then too it will affect the content. It will rot in sometime. Since the material is used for making essential structures, therefore, it is imbibed with some of the vital factors that include the moisture content as one of them. This factor depends on the thickness of the plywood and the volume of the material.

Introduction To The Tenacity Of Capturing Moisture

Firstly it is a product of wood where the solid wood is cut into different layers that are too of the same dimensions and compressed with a load. There are dryer machines that are used to absorb the moisture content from the original base material from where the plywood is manufactured. The highest range of moisture that should be present in the veneered product is not more than 10%.  Some rollers circulate continuously,and they itself generate a hot, dry air that releases the moisture content of the wood to a substantial extent. After this automatic process, the pieces are gathered together and kept one above another. There are pressing machines that compress the portions to form into thin slices of Plywood. All these activities are performed in a constant high temperature and pressure mode.

Devices are therefore to check on the moisture content factor of the material — basically, the adhesive that furnishes the plywood that imbibes the structures with the moisture resistant factor. It also gives a glossy look and hence can be used to make some products that include marine products such as boats and docks.

This adhesive property varies from material to material and the cost along with rises from to lower to higher. It is the best hybrid product of the wooden products and a fantastic substitute to manufacture any interior and exterior works. The material is not only tolerant of humidity but also the warmth that is the heat it is exposed and balances in between them to form a stable temperature to thrive. The devices that check on the moisture level can be both analogue and digital. Since water is a good conductor of electricity,therefore the impulses and the value can be calculated with higher chances of accuracy and can be gone through the further process.

A Small Attempt On Our Part To Enlighten Our Readers Regarding Plywood Market Of India

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Plywood industry in India is one of the most significant trade in India that serves the market by providing plywood for various construction and building purposes. Ply’s all over India are sold in some standard size (having its own appropriate measurements). So the standardization factors for plywood are very significant as the different size of ply’s serves for the distinct purpose of the building. To understand these better let’s find out more about it.

Standardized plywood thickness and size:

The companies that manufacture plywood in India maintain a standard when it comes to thickness and size. Our country adopted the metric system that is used Indian plywood market; the pricing policy used by the market is mostly based on cost per sq. foot.

The widely sold plywood planks that are sold inIndia market are of 8 feet by 4 feet. There are other sizes like 8×3, 7×4, 7×3, 7×4 and 6×3 are also widely manufactured and purchased by the customer.

Here we will try to enlighten our readers regarding the standardized plywood sizes of India market in square feet and in mm.

  • 8’ x 4’ ———– (2440 x 1220) mm.
  • 8’ x 3’ ———— (2440 x 920) mm.
  • 7’ x 4’ ———– (2140 x 1220) mm.
  • 7’ x 3’ ———– (2140 x 920) mm.
  • 6’ x 4’ ———— (1830 x 1220) mm.
  • 6’ x 3’ ————- (1830 x 920) mm.

When a novice customer goes for plywood shopping always check the ISI mark stamped on the sheet which is a mark of genuinity of the particular product.

The thickness of plywood is also similarly standardized like size, though it varies from one grade of plywood to another. Here is another chart for our readers to have a better understanding of this subject of dimensioning.

  • MR or Moisture Resistant grade comes in 3, 4, 6, 8, 12, 15, 18, 21, and 25.
  • BWR or Boiling Water Resistant grade comes in 4, 6, 9, 12, 16, 19, and
  • Shuttering Plywood comes in 6, 12, 15, 18, 21, and 25.
  • Blockboards* comes in 19 and 25.

All the measurements mentioned above are in millimeters.

Notes:

  • In the above chart, we have included Blackboards,but it is often not considered under the category of plywood. It is done so mostly due to the difference in its property in comparison to a typical plywood plank.
  • The thickness range for Marine and Fire Resistant grade plywood is same as that of the BWR grade which is already mentioned in the chart.
  • The shuttering Plywood mentioned in the chart is mostly meant and used in construction sites and not used for domestic purpose. So, if our readers are looking for plywood to make furniture, MR and BWR grade material will always be the best bet.

How to Veneer with Plywood – Useful Tips to Help You

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Plywood is a form of manufactured wood panel created by gluing of veneers with each other. The layers are attached to ply wood grain at 90 ° to each other. Veneers are thin wood slices that may be peeled off easily, and these are generally less than one-eighth of an inch in thickness. Plywood is generally composed of 3 veneer layers or more. It is essential to veneer with plywood in a proper way.

Tips for Veneering with Plywood

You need only minimal amount of surface preparation for veneering with plywood. Here are some assistive tips to help you:

  • Use a tack cloth to clean up the surface.
  • Follow the directions (if any) provided along with contact cement, in case you are using that process.
  • When it comes to applying veneer over plywood, it is recommended that you follow these steps:
  • Use yellow glue or white glue, hot or cold press and a vacuum. The white glue should have low amount of filler for preventing problems with products. Unless you can access a press, make use of contact cement with high quantity of solids. Always abide by the directions given by the adhesive manufacturer.
  • Next, use water-base finishes and achieve a veneer finish.
  • Lay the veneer out for readying. Use a plastic covering on it at all times.
  • Adhesive is required by wood veneer for strong bonding. Use a second coat for veneering.
  • After each adhesive coating, allow enough time for drying. Let the glue dry completely prior to the veneer application. Otherwise, the bonding will be weak and there can be bubbles.
  • Make use of a pinch roller while using contact cement for pressing the veneer to the substrate. In case there is no pinch roller, you may instead use a flexible wood scraper tool.
  • Before you apply the finish, let the adhesive dry for one whole day. Apply the finish in light coats.

How to Veneer the Edge of Plywood?

You may use some basic tools and a wood veneer edge banding roll to cover the edges of raw plywood. This makes the plywood almost impossible to tell apart from solid wood. Generally, iron-on edge banding happens to be wood veneer having the back coated with adhesive. Use a household iron to run it over. Heat the adhesive, and allow it some time to be cooled. Finally, trim its edges.

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