Polymer plastic plug impregnated with wood preservative and...

Stock material or miscellaneous articles – Composite – Of polyamide

Utility Patent

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Details

C428S479600, C428S535000, C428S536000, C428S537100, C215S356000

Utility Patent

active

06168870

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a preservative-impregnated, polymer plastic plug for sealing preservative chemicals in wood, and method of making the same.
BACKGROUND OF THE INVENTION
Preservative chemicals are placed into wood structures, such as wood poles, posts and pilings, by drilling a hole. After insertion of the preservative chemicals, the hole is sealed by means of a plug. If this plug is contaminated from dust, dirt, water or airborne spores during field use, it can serve as an initial inoculation for decay onset in the wood structure.
When wood plugs are used, an industry practise has been adopted of dip treating the plugs with a 2% copper napthenate preservative solution. This solution protects against the accidental transfer of spores by the plug during field use.
U.S. Pat. No. 5,114,032 discloses a reusable polymer plastic plug for sealing preservative in wood. The plug has threads that allow the plug to be inserted without rotation by hammering, but requires rotation for extraction from the hole. One inherent disadvantage of the reusable plastic plug is that there is no manner of introducing wood preservative into the plastic resin out of which the plug is made. Polymer plastic plugs cannot be dip treated in the same manner as wood plugs are presently treated.
SUMMARY OF THE INVENTION
What is required is a method of making a polymer plastic plug impregnated with wood preservative and a polymer plastic plug made in accordance with the method.
According to one aspect of the present invention there is provided a method of impregnating a polymer plastic plug with wood preservative. A first step involves dehydrating a polymer plastic plug to reduce its naturally occurring moisture content. A second step involves introducing liquid wood preservative into the polymer plastic plug while the polymer plastic plug is in a dehydrated state by immersing it in the liquid wood preservative and boiling the liquid wood preservative at temperatures that are less than that required to turn the polymer plastic plug into a molten state. In accordance with the teachings of this method liquid wood preservative is absorbed into the dehydrated polymer plastic plug in place of the naturally occurring moisture content.
All polymer plastic resins have some naturally occurring moisture content. The present method takes advantage of this fact, by substituting liquid wood preservative for the naturally occurring moisture content.


REFERENCES:
patent: 5114032 (1992-05-01), Laidlaw
Removable Re-usable Replugs, W.S. Laidlaw Products Ltds., product brochure, 2 pages, Apr. 1992.
Engineering Plastic Products, Polymer Corporation Product Brochure, 30 pages, 1992. (No Month).

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