Inspection Standard for Wooden Furniture

Inspection Standard for Wooden Furniture

Inspection Requirements for Appearance Quality

The following defects are not allowed on processed product: those parts made of artificial board shall be completed for edge banding; there are degumming, bubble, open joint, transparent glue and other defects existing after fitting overlay material;

There are loose, open joint and crack existing on spare part joints, mortise joint, inserting panel parts and various supporting elements;

The product installed with hardware fitting is not allowed the following defects existing: fitting defect, installing hole without installing parts; the bolt on installing parts is missed or exposed; the moving parts are not flexible; the fittings are installed loosely and not firmly; there are crumbles around installing hole.

Inspection Requirement for Dimension Quality

The furniture dimension is divided into design dimension, limit deviation size, opening and position tolerance dimension.

Design dimension refers to that marked on product pattern, such as product dimension: height, width and depth.

Main dimension, also named as functional dimension of product, refers to design dimension of some parts on product and must conform to the dimensional requirement specified by standards. For example, if the part of wardrobe has standard regulations and the clearance depth shall be ≥530mm, then the design dimension must conform to this requirement.

Limit deviation dimension refers to the difference calculated through measured value of actual product minus product’s design dimension. The limit deviation of unfoldable furniture is ±5mm while that of foldable furniture is ±6mm specified by standard.

Shape and position tolerance dimension: including 8 items: warpage, flatness, perpendicularity of adjacent sides, position tolerance, drawer swinging range, drooping, product footing, ground roughness and open joint.

Quality Inspection Requirement for Wood Moisture Content

It’s specified by standard regulations that wood moisture content shall satisfy annual average wood moisture content where the product is located + W1%.

The above “where the product is located” refers to the tested standard value calculated by wood moisture content shall satisfy annual average wood moisture content where the product is located + W1% when inspecting the product; when purchasing the products, if distributer has additional requirements on wood moisture content, please clarify it in order contract.

Performance Requirement for Physicochemical Quality Inspection of Paint Film Coating

The test items for physicochemical performance of paint film coating include 8 items: liquid resistance, moist heat resistance, dry heat resistance, adhesive force,  abrasive resistance, resistance to cold and hot temperature difference, impact resistance and glossiness.

Liquid resistance test refers to that anti-chemical reaction will occur when the paint film of furniture surface contacts with various penitential liquids.

Moist heat resistance test refers to that of changes caused by paint film when paint film on furniture surface contacts with 85℃ hot water.

Dry heat resistance test refers to that of changes caused by paint film when paint film on furniture surface contacts with 70℃ objects.

Adhesive force test refers to that of bonding strength between paint film and base material.

Abrasive resistance test refers to that of wear strength of paint film on furniture surface.

Test of resistance to cold and hot temperature difference refers to the changes caused by paint film after paint film on furniture passing the cycle test with the temperature at 60℃ and under -40℃.

Impact resistance test refers to that of capacity for impact resistance to foreign objects of paint film on furniture surface.

Glossiness test refers to the ratio between positive reflected light on surface of paint film and positive reflected light on surface of standard board under the same condition.

Quality Inspection Requirement for Product’s Mechanical Property

The test items for furniture’s mechanical property include: strength, stability and duration test for tables; strength, stability and duration test for chairs and stools; strength, stability and duration test for cabinets; strength and duration test for beds.

Strength test includes dead load test and dead load test in impact test and refers to the test for the strength of product under heavy load; impact test refers to simulation test for strength of product under the condition of casually impact load.

Stability test refers to simulation test for anti-dumping strength of chairs and stools under load condition in daily use, and that of cabinet furniture under load condition or no-load condition in daily use.

Duration test refers to simulation test for fatigue strength of product under repeated use and repeated loading condition.