• Introduction

When manufacturing teak engineered flooring in the factory, a high proportion of surface defects is often detected in the quality inspection. These defects typically manifest as scratches or dents that are oriented vertically to the grain, with lengths of approximately 1 to 3 cm, and they are quite shallow. These defects can usually be eliminated by sanding. As illustrated in the following image, the scratches frequently appear as single or multiple lines at the end or edges of the boards, and they become very apparent after painting and finishing.


So, how are these scratches and indentations produced?


  • How come?

Let’s start with the conclusion: The scratches and dents are a result of small sand particles and pebbles on the surface of the unfinished boards being squeezed and rubbed against each other during the stacking process. So, where do these sand particles come from on the teak unfinished flooring boards?


The teak engineered flooring in the factory requires exposure to sunlight before the painting process. This exposure allows the teak to undergo photo-oxidation, resulting in an improved surface color and enhanced beauty.


(Referring to the previous article to understand why teak needs to be air-dried.)


In order to achieve a uniform sun exposure and maximize the absorption of sunlight, unfinished teak flooring boards are laid flat on the ground, which inevitably causes sand particles and pebbles from the ground to adhere to the back of the boards. When these boards are stacked together, it results in surface scratches and dents.


  • How to prevent?

To prevent sand particles from adhering to the back of the flooring in the sun exposure process, we place spacer strips underneath the boards, creating a small gap between the boards and the ground. Although it’s not entirely feasible to eliminate sand particle adhesion, this approach substantially diminishes the chances of surface damage resulting from sand particle abrasion. Typically, having fewer than 5% of the boards with surface scratches or dents is considered acceptable.


Using spacer strips to lift the teak flooring boards in sun exposure offers multiple advantages. It not only prevent sand and pebbles but also provides additional benefits. To promote the teak’s photo-oxidation reaction and maintain consistent moisture levels, preventing potential cracking and warping due to uneven air-drying, the boards are misted with water four to six times daily. Employing spacer strips to establish a separation between the boards and the ground effectively prevents water from collecting at points of board-ground contact or on the upper surface, thus averting localized water saturation.


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