Furniture inspection: chair inspection standards and processes

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Tool Preparation:

Tape measure, level, tester, filming tools, carry paper recording forms and pens to record in detail all inspection data, description of the problem and its handling.

Data collection:

Collect order information of chairs, including product model, quantity, material requirements, color, style, etc.; obtain product design drawings to clarify size specifications, design and process requirements.

II. Appearance check

Overall Appearance:

Under natural light or near-natural light conditions, make an all-round observation of the chair. The chair as a whole should have no obvious deformation, skewing, natural and smooth connection of all parts, and no stains.

Surface Material:

1. Cloth material: the cloth surface shall not have stains, blistering, glue seepage, perforation, drawing, skipping, stripes and yin and yang color phenomenon. There should be no obvious color difference between the color and the sample, and by comparing with the standard color card, we can ensure that the color deviation is within the permissible range of the industry. Touch the cloth surface with your hand to feel its flatness and softness, and there should be no roughness or stinging feeling.
2. Leather material: leather surface without scratches, discoloration, perforation, obvious scars, uniform color and no obvious color difference and odor compared with the sample. Wipe the leather surface with a wet or dry cloth 10 times, observe whether there is color loss, damage and other conditions. Check the consistency of the leather pattern, especially in the splicing parts, the leather pattern should be naturally articulated, without obvious pinholes.
3. Wooden parts: the paint film on the surface of wooden parts should be smooth and even, without hanging, bulging, orange peel, missed paint, scratching phenomenon, no obvious color difference with the color plate. Contact with people should be smooth, no brown hand, burr phenomenon, touch the wooden surface, there should be no obvious bumpy feeling.
4. Hardware parts: The coating of hardware parts shall not have scratches, bottoming out, rust, roughness, unevenness, orange peeling, hanging, etc. The color shall not have any obvious color difference in comparison with the color plate. The surface of plating parts should be bright, without yellowing, scratches, rust, pinholes, spots, burrs and de-coating and other phenomena. Stainless steel parts surface without scratches, oxidation, no desoldering, false welding, welding through, connecting parts welded and polished smooth, tightly combined.
5. Plastic parts: the surface texture and brightness of the plastic parts are consistent, no bubbles, watermarks, cracking, decolorization, particles, deformation, softness and hardness inconsistencies, and there is no overflow of adhesive on the combined parts of the mold.

III. Size Measurement

Use a steel tape measure to measure key dimensions of the chair, and the measurements shall conform to the requirements of the order, drawings, and related materials.

1. Seat Height: The vertical distance from the ground to the surface of the seat.
2. Seat depth: the horizontal distance from the front edge of the seat to the back edge.
3. Seat Width: The maximum horizontal distance between the left and right sides of the seat.
4. Back Height: The vertical distance from the surface of the seat to the top of the back.
5. Armrest height: the vertical distance from the surface of the seat to the top of the armrest. Height deviations of chairs from the same batch, especially when placed together in use, should be within the permissible values.

For chairs with special size requirements, such as children's chairs, ergonomic chairs, etc., measurements are taken in strict accordance with the design requirements to ensure that they meet the needs of specific usage scenarios.

IV. Material Inspection

Wood material:

Observe whether the wood texture is clear and natural, without obvious splicing traces. Check the surface of the wood for insect infestation, mold, bark residue, etc., to ensure that the wood has been treated with insecticide and anticorrosion.

Use the wood hardness tester to detect the hardness of wood, different types of wood have corresponding hardness standards, such as oak hardness should be in line with its material properties, to ensure that the chair structure is solid.

For solid wood parts, you can listen to the sound by knocking to determine whether there are internal voids, decay and other issues, the sound should be crisp, solid.

Metal:

Metal parts are detected with metal flaw detectors to check for internal defects such as cracks, sand holes, air holes, etc. to ensure reliable quality of metal parts.

Measure the thickness of metal parts, such as chair legs, frame and other key parts of the metal thickness should be in line with the design requirements, to ensure the load-bearing capacity and stability of the chair.

Check the adhesion of the coating on the metal surface, scribe the grid on the surface of the metal coating with a Baguette knife, and then stick it with tape and tear it off quickly to observe the shedding of the coating, and the number of shedding grids should be within the standard range to ensure that the coating is not easy to fall off.

Upholstery:

For fabric or leather material, in addition to appearance inspection, use the fabric abrasion tester to conduct abrasion resistance test. According to the standard test method, under a certain pressure and number of friction times, observe whether the surface of the fabric is broken, pilling and other phenomena to ensure that the fabric has sufficient abrasion resistance.

Check the density and elasticity of the sponge and other fillers. Press the filler with your hand, feel its elasticity, rebound should be rapid, strong, and no obvious collapse. By measuring the density of the sponge, determine whether it meets the design requirements to ensure the comfort of the chair.

V. Structural inspections

Connection site:

Check the connection of the chair parts, such as screw connection, mortise and tenon connection, welding connection, etc.. Screws should be tightened without loosening, and a screwdriver can be used for spot checking to ensure that the screws have enough tightening force. Mortise and tenon connection should be tight, no gap, tenon and mortise fit well to ensure structural stability.

For welded parts, check that the welds are uniform, full, and free of defects such as false welds, leaks, and weld penetrations. Use a magnifying glass to observe the details of the weld to ensure that the quality of the weld meets the standard.

Frame structure:

Shake the chair to feel the stability of its overall structure, there should be no obvious shaking, loose feeling. Apply a certain amount of external force to the chair to simulate the daily use of the force situation, and observe whether the frame is deformed, cracked.

Check the diagonal length of the chair to ensure that the frame is square and that the error in the length of the two diagonal lines should be within a very small margin to ensure that the chair is placed smoothly.

VI. Functional testing

Regulatory function:

For chairs with lifting, rotating, tilting and other adjustment functions, carry out multiple adjustment operations. Organs or have the requirements of the armrest lifting mechanism and angle adjustment mechanism, should be lifting and lowering light and flexible, strength to meet the requirements, in the process of adjustment, no jamming, rattling.

The air pressure bar should be smooth, no air leakage, no abnormal noise, any height can be static, stable and with the five-star foot with close. Try to sit and tilt backward, lift and lower 3-5 times, check whether the tilting angle is moderate, flexible, good stability, strength and rigidity in line with the requirements.

Mobile Functions:

The casters should rotate lightly and flexibly, with no breakage and firm connection. Push the chair to move on the horizontal ground, check whether the steering of the casters is flexible and whether they can follow the moving direction of the chair smoothly.

For swivel chairs, they should be easy to dismantle and assemble, with reliable connections after assembly, not easy to come loose and land smoothly. The rotating test of the swivel chair should be carried out, and the rotating process should be smooth, with no obvious resistance or stagnation.

Trial sitting experience: Arrange for people of different weights and heights to sit on a trial basis to assess the comfort of the chair from an ergonomic point of view. The seat cushion and backrest should be able to provide good support, and there is no obvious fatigue after sitting for a long time. Check whether the depth and width of the seat surface of the chair are suitable, and whether the height of the armrests is in line with the natural position of the human body.

VII. Stability testing

Static stability: Place the chair on the horizontal test bench, load the weight on the chair according to the standard, simulate the human body sitting on the chair. Observe whether the chair has tilting and shaking phenomenon to ensure that the chair remains stable under static load.

Dynamic stability: use the stability test equipment to simulate the dynamic test of the chair in daily use, such as rocking back and forth, swinging left and right. In the dynamic test process, the chair structure should remain stable, no loose parts, shedding phenomenon, to ensure the stability of the chair in long-term use.

VIII. Packaging Inspection

Check whether the package is intact, without damage, deformation, moisture and other phenomena. Packaging materials should meet the requirements for protecting the product, such as using cardboard boxes of sufficient thickness, foam boards, bubble wrap, etc. for protection.

Confirm that the accessories, manuals, warranty cards, etc. in the package are complete. Accessories should not be damaged, missing, the manual should be a detailed and accurate description of the chair's installation methods, precautions for use.

IX. Records of inspection results

Record: The inspection personnel should record the results of each inspection in detail during the inspection process. Use the equipment to photograph the overall appearance of the chair, the key parts and the problems found, and correspond the photo number to the record form. In the record form, clearly record the chair's model, batch, inspection items, measurement data, whether it is qualified, description of the problem and other information to ensure the accuracy and completeness of the record.

Judgment: According to the inspection standards, the chair is judged comprehensively. If the chair in the appearance, size, material, structure, function, stability, environmental protection and other aspects are in line with the requirements, it is judged to be a qualified product; if there is one or more does not meet the standard, it is judged to be unqualified products. For unqualified products, a detailed list of unqualified items and the severity of the problem.

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