Full Analysis of Inspection and Certification Standards for Sofa Products: A Comprehensive Guide for Quality Control Throughout the Entire Process from Appearance to Packaging

March 30, 2026

Part One: Overall Inspection Requirements
1. Symmetry and Coordination
The overall shape is symmetrical on both sides (for specific guests and specific styles, pay particular attention to the symmetry of the backrest)
The connections between all parts are coordinated and smooth.
II. Cleanliness Inspection
The surface is clean, without dust, gun oil, or glue contamination.
There is no foreign object in the crevice (The inspector needs to carefully touch and check each corner of the sofa)
III. Color and Stitching
The overall color combination is harmonious and there is no color discrepancy.
The color of the stitches matches that of the leather surface.
IV. Sewing Process
The seams are firmly sewn together, with uniform needle spacing, straight lines, and smooth transitions at turns.
Prevent the occurrence of loose threads, broken threads, open threads, and needle holes (Regular inspections and tests are required for the covers.)
V. Leather Surface and Leather Usage
The corners of the leather surface should be sewn correctly, and the added fixed length should be accurate. Special attention should be paid to the areas with prone-to-sewting points.
The surface texture is consistent with the leather panel, without any scars, no peeling of the leather, no nail holes, and no adhering substances under the skin.
The position of the leather (the top layer and the second layer) must be correct and cannot be used incorrectly (the customer's standard is that the front part should be all top layer).
VI. Seat Comfort and Back Support
For three-seater and two-seater configurations, the requirements for seat comfort should be the same as those for the single-seat configuration.
The comfort of the different back cushions should also be consistent (the inspectors need to personally experience each sofa)
The ride is slightly softer than the seat comfort.
VII. Label Inspection
All labels are properly attached as per requirements, with correct positions and quantities.
Part Two: Backrest Inspection Standards
1. Inner Liner Inspection
The loose cotton in the inner liner should be properly positioned at the edges, evenly distributed, and the overall surface should be flat without any unevenness.
The inner liner must not be in the form of a block.
The sprayed cotton on the inner liner surface should be flat and uniform, and no folded or curled edges should be allowed.
For those with duck down bags, pay attention to the proportion of the duck down and the stitching of the inner lining.
II. Appearance and Fixation
The flat surface at the top of the back pad is basically in a straight line (for both two-position and three-position models)
The underside of the back pad is firmly fixed, and when viewed from the side, it basically forms a straight line.
The seams of the back cushion are evenly wrinkled, the seams are straight and aligned with the seams of the seat cushion.
The overall appearance of the backrest should be full and rounded, with proper corners, without any wrinkles, and the surface should be smooth without any unevenness.
Part Three: Inspection Standards for Seat Cushions
1. Inspection of Inner Liner and Sponge
The inner liner and sponge should be straight and upright, with an overall smooth surface.
The spray-bonded cotton on the surface of the sponge should be flat and uniform, and no fraying or curling edges should be allowed.
II. Appearance and Fit
The outer contours of the front openings of the upper pad and the lower pad are basically in a straight line.
The seating surfaces for the third and second rows should be flat.
The pads must be closely attached to each other, with straight and even stitching that is exposed evenly.
The stitching along the outer edge of the upper pad is basically in a straight line when viewed from the side.
The two ends of the stitching on both side cushions must not curve downward, and the lower edge of the stitching must not be wrinkled.
III. Fixation and Connection
The inner side of the upper pad must be firmly fixed.
The connection between the front sides of the seat cushion (upper and lower cushions) and the armrests should be smooth and seamless without any gaps.
IV. Leather Surface and Dimensions
The leather surfaces of the underlay and seat cushion must be smooth and free from any wrinkles.
The width of the base should be uniform both at the top and the bottom, and the phenomenon of being wider in the middle and narrower at the ends should be completely avoided.
The distance from the stitching at the base and the lower pad to the front opening should be kept consistent, and the phenomenon of deeper on one side and shallower in the middle should be avoided.
The lower pad opening must not extend beyond the upper pad opening.
The bottom front edge is level with the front of the armrest.
The upper edges on both sides of the seat base (where the seat base and the armrest cover overlap) should be seamlessly and perfectly overlapped. There should be no exposed knife edges, no exposed foam, and no wrinkles.
V. Detail Requirements
The front seam of the seat cushion should be perpendicular to the bottom edge of the seat, and no tilting should occur.
The sponge on the underside should be in close contact with the edges, and the entire surface should be smooth. There should be no cases of edge folding or overlapping.
The bottom edge of the seat cushion should be smooth and wide, and there should be no water wave-like wrinkles.
When pressing the seat surface with your hand, the spring must not make any clicking or rubbing sounds.
Part Four: Inspection Standards for Armrests
1. Inspection of Inner Liner and Sponge
The loose cotton inside the handrest should be properly positioned at the edges, evenly distributed, and the overall surface should be flat.
Eliminate any situations such as vacancies or block-like patterns.
II. Sewing and Fixing
The sewing line at the front edge of the armrest is level with the edge of the wooden frame. The edge of the wooden frame is evenly joined by the seams of the sewing line.
The inner side seam of the front cover should be straight both from top to bottom.
The inner lining leather and the handle cloth should be tightly fastened and securely fixed.
The sealing strip at the front cover should be straight and firm from top to bottom.
Use double needle stitching. The distance from the stitching line to the hem edge for the lines closer to the hem edge should be 1 to 2 millimeters.
III. Sponge and Sealing
The sponge on the sealing bar and beneath the front cover must be smooth and firm, without any sharp edges. There should be no wrinkles.
The indentation area below the edge sealing pad should be smooth and wide, without any sharp edges and free from wrinkles.
The seams of the hand pads, back pads and edge seals must be sewn tightly to prevent any splits or loose stitches.
The overall and jointing of the subcutaneous sponge should ensure that the edges are well-defined and smooth, and there should be no occurrences of balling, overlapping or missing sections.
IV. Appearance and Adhesion
The connection between the front and back pads should be harmonious and natural, without any gaps or depressions.
The cover skin of the package must be adhered平整ly and firmly， and there should be no phenomenon of peeling off.
Part 5: Post-shipment Inspection Standards
1. Leather Surface and Stitching
The leather surface should be taut and flat. It is acceptable if there is no wrinkling when pushing the leather with your hand.
The stitches at the back seam must not be pulled crooked; they should be perpendicular to the bottom edge or the ground.
II. Shape and Corners
The rear side of the backrest on the top of the wooden frame should have a shape that highlights the flat surface of the frame.
The rear edge trim should be properly stretched to ensure that the stitching lines are precisely placed along the edge of the wooden frame, and there should be no misalignment.
III. Sponge and Splints
The entire and joined surface of the sponge under the skin should be smooth and free from balling, overlapping, missing edges or blocks.
The rear cover plate should be flat, smooth, complete and sturdy.
No protruding nails are allowed, and no cracks are permitted.
When lifting the back, there should be no abnormal sound (caused by the dampening and bending deformation of the splint)
4. Lower edge stitching
The stitching at the lower edge of the rear closure must be intact and no broken threads are allowed.
Drill holes and flatten the edges.
Part VI: Bottom (Base) Inspection Standards
1. Desiccant Inspection
Quantity: 6 packs for each of the three types, 4 packs for each of the two types, 2 packs for each type.
Location: Uniformly distributed at the bottom of the sofa
Method: Put the desiccant in a non-woven fabric bag. Fold the bag opening edges to seal it and fix it. When nailing the bottom of the bag, stretch the bag out (so that the bag does not sag when placed flat on the sofa)
The placement should be correct and secure. The bag must not be torn or loose, and its bottom should not exceed the bottom of the wooden frame.
II. Bottom Fabric Inspection
Positioning:
The distance from the folded edge to the outer edge is 10mm.
The distance between the nail and the fabric edge is 1 to 2 millimeters.
The spacing of the nails is approximately 25mm.
Please provide the accurate and error-free English translation of the following text,
The spacing between nails is uniform, straight and flat, and there are no occurrences of missed nails, damaged nails, floating nails or false nails.
The outer side of the light frame must not have any loose nails.
After the surface of the base cloth is treated, it is required to be flat, intact and clean.
III. Foot Inspection
Quantity: The quantity is correct. Those requiring medium-sized feet must be fitted with medium-sized shoes.
Positioning:
The center positions of the front and rear feet are at the same distance from the outer openings on both sides.
The center point of the middle foot is located 150mm away from the front edge of the wooden frame (except for special requirements)
Please provide the accurate and error-free English translation of the following text,
Fixed firmly and installed stably. There should be no unevenness at the four corners on the horizontal surface.
The color of the shoes matches the color confirmed by the customer, and the size is correct.
The surface shows no scratches or abrasions, and there are no paint defects.
IV. Inspection of Packaging Wooden Legs
Materials: The requirements are that there should be no insect damage, no cracks, and no dead knots.
Position: Install according to packaging design requirements. The wooden feet must be placed correctly and must not be tilted.
Fixed: The screw must not be broken and the fixation must be secure.
Quantity: Three and two pairs should be placed on the right side of the sofa, and one pair should be installed on each side of the single seats.
Packaging: A wooden base and assembly instructions are required.
V. Internal Cleaning Inspection
The interior of the sofa should be free of any foreign objects, such as wood pieces, nails, screws, tools, etc. (Special attention should be paid during packaging)
Part 7: Packaging Inspection Standards
1. Packaging Method
Strictly follow the packaging method confirmed by the customer.
II. Label Inspection
Before packaging, confirm that all the labels and tags requested by the customers are correct.
III. Protection Inspection
The non-woven fabric cover must completely cover the entire sofa.
All the guard plates must be of the correct size and the foam must be properly placed.
IV. Outer Packaging Inspection
Wrap the sofa tightly in a plastic bag and seal it with transparent tape. The tape should be neat.
V. Outer Box Identification
Adhere the outer box labels as per the customer's requirements
VI. Storage and Handling
When storing, be sure to handle the items carefully to avoid damaging the packaging.
Arrange the products by model, color and order number, so as to facilitate loading into containers and quantity checking.
Part 8: Link between Factory Audit and Certification
I. Supplier Capability Assessment
During the factory audit, the sofa supplier is required to conduct a key assessment of:
Wooden frame manufacturing process and quality control
Sponge cutting and bonding process
Leather Material Purchase and Inspection Records
Quality control points for the sewing process
Standardization of packaging materials and packaging methods
Qualifications and training records of inspectors
II. Product Certification Requirements
For sofa products to enter different markets, they must comply with the corresponding certification standards:
Chinese market: GB/T 3324 "General Technical Conditions for Wooden Furniture", GB 18584 "Limits of Hazardous Substances in Wooden Furniture"
EU market: REACH regulations, fire safety standards (such as EN 1021-1/2)
US market: CA TB 117-2013 Fire Resistance Standard, BIFMA Office Furniture Standard
During the inspection process, it is necessary to verify the consistency between the product labels and the certification certificates.
III. Continuous Improvement
Any quality issues identified during the inspection should be promptly reported to the supplier.
Repetitive issues need to be followed up and rectified through factory inspections.
Establish a quality traceability record to support product certification audits
Regularly update the inspection standards to adapt to the changes in regulations in the target market.