Check the quality of the frame of the all-inclusive sofa, and be sure to ask the sales or production staff to open the masked cloth at the back to view the interior. The main frame should use mortise and tenon; wood screws can be used in other places. The sofa whose internal frame is all made of nails should be purchased; otherwise, even if the wooden frame is not bad for the time being, the frame must be loosened soon after use. The frame wood should be solid wood. Wood that is too soft, such as pine (larch, etc.), poplar, and linden, is not suitable for sofa frames; wood that has split, moth-eaten, decayed, and scarred cross-sections more than one third of the surface cannot be used. The moisture content of wood should be below 16%. There should be no fracture, lack of material and looseness at the joint. After the internal inspection, it must be inspected from the outside. Press one leg on the seat surface and twist the backrest with both hands. If there is no looseness or creaking sound, it proves that the quality of the frame is still acceptable.
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