Views: 69 Author: Site Editor Publish Time: 2022-11-15 Origin: Site
A sofa is an upholstered multi-seat chair. A spring or thick styrofoam chair with arms on either side is a type of soft furniture. Sofa inspection and detection is very important. So how to inspect the sofa? This article will give you a detailed introduction to the sofa inspection methods and standards, I hope you learn something successful.
First, the overall inspection standard of the sofa
(1) Design and appearance
The style and collocation of the design is decided by the designer, which is not controlled by the scope of inspection personnel. So we mainly discuss the inspection standard of appearance.
1. After the hair is arranged, see whether the combination of edges and corners is regular, touch the parts of the handrail and corners, to see whether it is empty and whether the sponge is elastic.
2. Strictly follow the size of the prenatal sample after confirmation.
3. Leather and cloth:
a. Inspect the color, texture, softness, etc. of the leather or cloth when it comes back to the factory.
b. Leather/cloth according to the confirmed sample, soft and hard moderate, not hard, not smelly.
c. Palpable skin is smooth, full and elastic, without bump or fold; Fabric sofa fabric splicing pattern should be complete, the direction of the fluff is the same, no hair removal phenomenon.
d. Pick a part of the cortex with both hands to see if there are fine cracks, the cortex or cloth without fading, colorless, dirty and residual spots.
4. Color: The product color shall be consistent with the confirmed sample. The overall color shall be uniform without color difference, and the color of different PO of the same ITEM shall be consistent. Bright colored fabric or leather, white towel can be used to wipe a few times on its surface to see if there is fading.
5. Lathe worker: the car type is meticulous, no obvious floating line, the embedded line should be smooth and straight, no exposed thread, symmetrical rounded corners, exposed nails arranged neatly, no exposed white, no gaps, good stitching, no cracks. The first layer should be placed on top of the second skin.
6. The surface of the external wooden parts is exquisite and smooth, no tree knot, wound, stubble, reverse grain, groove and mechanical damage, no burr by hand touch, and the outside should be chamfered. Fillet and camber and line should be symmetrical and uniform. Straight and smooth, no knife marks sand marks.
7 external paint pieces should be no paint and peeling, the surface to keep bright, no dust and other small spots, electroplating layer should be no crack peeling and rust.
8. The packaging must be complete, the hardware package is complete, the packaging is not damaged, the content of the feeding mark is correct and clear.
1. Confirm the sofa sitting sensation of prenatal sample:
The body is free fall sitting on the sofa, feel whether the sofa is elastic, is not only according to the prenatal confirmation sample, and confirm whether there is a feeling of sitting on the wooden frame.
2. Press the armrest and backrest of the sofa by hand. The leather or cloth is soft and hard, and there is no obvious feeling of the existence of the wooden frame.
3. There should be no abnormal sound of metal friction and impact on the face and back of the press seat with bare hand.
4. The exposed metal parts have no edge burr, the gap between the seat surface and the armrest or the back of the backrest, the bare hand extends into the sofa without burr edge, so that the non-sharp metal objects can penetrate the seat surface and the back.
5. Touch the sofa surface for a long time to feel whether the fabric will stimulate the skin, and observe whether the fabric used before and after the sofa is the same.
1. Wooden frame: Check whether the moisture content of wood is high, whether the wood is regular and strong, and whether the wooden frame is stable. Whether the sponge inside clean, dry, no odor. Check the matching throw pillow and touch the interlining and padding.
2. Functional chairs need to be tested whether their functions are complete.
3 sofa feet: metal sofa feet whether there is rust, welding joints are loose, wood sofa feet whether there are cracks.
4. Hardware: nail gun neat and complete, solid structure, no loose fall off.
5. Leather: Wear well. Rough cloth can be rubbed against the leather to test its wear resistance.
Second, the finished appearance inspection standard of sofa
(I) Product appearance requirements
1. After the sofa is arranged, the overall shape is symmetrical, the connection between the parts is coordinated, the combination of edges and corners is regular, the parts of the handrail and corners can be touched, there is no empty Angle, there is no foreign body in the cracks, and the resilience of foam should be high;
2. The product shall strictly follow the size and color of the pre-production sample after confirmation;
3, soft surface wiring should be smooth and straight, the rounded corner is symmetrical, no obvious floating line, jump needle or exposed thread head;
4, the covered fabric stitching symmetrical pattern should be complete; The same part of the fabric direction should be the same, there should be no obvious color difference;
5. The surface of soft bread cover should be flat and full, elastic and uniform, and there should be no obvious wrinkling. There should be symmetrical technology wrinkling and it should be symmetrical and well structured;
6, the covered fabric should be free of damage, scratches, color stains, oil stains;
7, exposed rivet arrangement should be neat, the spacing is basically equal, there should be no obvious rivet knock flat or paint off;
8, sewing stitch spacing should be uniform, no obvious floating line, bending or exposed thread, off thread, seam, degumming;
9. Press the armrest and back of the sofa by hand. The leather or cloth is soft and hard, and there is no obvious feeling of the existence of the wooden frame.
10, three, double the same seat of the different seat requirements of the same sense of seat, the feeling of different back cushions should also be consistent (each sofa to experience);
11. When pressing the seat surface by hand, the spring shall not make such sounds as impact and friction.
12. The packaging must be complete, the hardware package is complete, the packaging is not damaged, the content of the shipping mark is correct and clear;
13, lift the sofa to see whether the bottom of the treatment is detailed, the sofa legs are required to be straight, the surface treatment must be smooth, the bottom of the leg should have a non-slip pad;
14. All labels shall be set as required (correct location and quantity are required).
(2) Paint film appearance requirements
1, the color of the same color parts should be similar;
2, no fading, fading phenomenon;
3, the coating should not wrinkle, sticky or paint leakage phenomenon;
4, the coating should be smooth, clear, no obvious particles, no obvious processing marks, scratches, white spots, bubbling, bristles.
5, the product surface spray uniform, do not allow thick spray thin phenomenon.
6, the external paint pieces should be no sticking paint and peeling, the surface to keep bright, no dust and other small spots.
(3) Appearance requirements of hardware accessories
1. The structure and size of each part shall meet the requirements of drawings or samples;
2, no obvious burr (less than 0.2mm), indentation, bump and obvious warping deformation phenomenon, smooth interface, beautiful spot welding;
3, the color and the template have no obvious color difference, the same visual board surface color uniformity, no dark lines, color spots, noise;
4. If there is a pattern font or LOGO on the surface, the pattern and font should be clear and correct with complete content; Position deviation ±0.5mm
5, hardware surface or welding parts are not allowed to have rust phenomenon, incoming materials should do salt spray test;
6, children's products can not use any sharp head screws.
Soft and fresh small sofa
Three, sofa product structure processing technology requirements
(1) Processing framework
1, the frame of the sofa is the basic shape of the sofa and the main load to bear part, but also the foundation of the production of the sofa, so all the sofa frame shall not use rotten wood, fracture, serious lack of material or bark, stuttering, bug eyes of the wood;
2, the frame opening size deviation length, width should be controlled at ±1MM, thickness size deviation should be controlled at ±.5MM;
3. The edge of the opening material should not have appearance problems such as raw edge, breaking edge, sawtooth, wave and so on.
4, control the moisture content of parts does not exceed 8%
(2) Nail the frame
1, the frame length of the material bar height size should be unified, so as to avoid uneven surface;
2. There can be no floating nails, virtual nails or nail head leakage and other phenomena;
3, the nail should be flat, to prevent leakage of nails, play explosion;
4. The placement of wooden strips shall be placed in strict accordance with the drawings;
5, the structure is strong, the interface is tight, the wood is not broken, deformation, distortion phenomenon;
6, the back tilt Angle is consistent, the overall size deviation shall not exceed 3MM;
7, the frame positioning should be right Angle, not tilt.
1. All the sewing leather and fabric lines should be straight, symmetrical in radian, smooth in wiring, and no skew or damage on the whole;
2, all leather stitch length of 2.5 cm is 5-6 stitches, fabric stitch length of 2.5 cm is 6-7 stitches;
3. There is no thread breaking, needle skipping or surface knotting in the sewing parts of all fabric leather materials;
4. The leather seam position is correct, and the grain error at the seam position of the fabric should not exceed 1-2 mm;
5, all sewing surface pressure line is uniform, the width is consistent, the sewing line should be consistent with the main color;
6. After processing, there is no floating line, no jumper, no pinhole leakage on the surface of the sewing. The color of the line matches that of the leather cloth surface, and the cloth texture is uniform, without skew.
(4) Cutting foam
1. Proofread sponge type and density according to product style requirements before cutting;
2, the cut plane is vertical, the cut is flush, the hypotenuse, the cut edge shall not have serious waves;
3, accurate size, length, width limit deviation ≤±2MM;
4, the sealing of the product shall not be split, the sponge shall not exceed the ammonite skin too much, and the nail position;
5. The radian is consistent with the drawing requirements.
(5) Spray glue
1, the selection of standard environmental protection formaldehyde free spray glue;
2, the glue requires spraying evenly, in place, no leakage spray;
3, sponge paste is smooth, no wrinkles;
4. Whether the sponge paste is distorted and displaced.
(6) Ammonite skin
1. The handrail, screen and seat of the same product have the same degree of large, small, high and low; the seat Angle and screen Angle are full to the same degree; the screen line is aligned with the seat line, and the seam is compact;
2, in the back of the observation, the front line of sight and the seat surface of the same horizontal plane observation seat surface, concave and convex to be uniform;
3, no floating nails, virtual nails and broken nails phenomenon;
4. The back fabric seam should be aligned with the screen fabric seam, the edge should be straight, and the back of the screen neck should be full and wrinkl-free;
5. Where the bottom cloth is covered, the excess sponge and spray cotton should be cut off;
6, the nail should be in a straight line, the distance between the nail and the nail is about 2cm;
7. Keep the bottom surface flat, no nails exposed or broken, and do not hurt hands by hand.
1, labeling content should not be wrong or unclear;
2, the product should have the product qualification label;
3. The number or letter mark of the component shall not be omitted or pasted in the wrong position;
4, the product should have warning mark (such as careful handling mark, fragile mark, moisture-proof mark, etc.).
(8) Accessories bag
1. The specifications of the accessories are correct and consistent with the actual needs;
2, different specifications of hardware can not be mixed packaging (such as British system);
3, hardware accessories can not rust, stains;
4, wooden accessories can not have moth or mold;
5, accessories can not leak, put more;
1. The instructions should be clear and easy to understand, so that customers can assemble the products according to the instructions. Some key parts of the assembly should have explosion diagrams on the instructions;
2. The hardware, language and component size on the manual are consistent with the data;
3, manual printing can not miss the page, repeated page, damage.
Four, sofa product safety test requirements
(I) Fabric testing requirements
1. Leather: the total lead content of all surface coatings is less than 40PPM, the total lead content of heavy metals in the bottom material is less than 100PPM, and the soluble lead content of the bottom material is less than 90PPM;
2. Leather/fabric tension test: randomly take no less than 5 pieces (divided into warp and weft) and cut into 3*4 inch samples, and the tension test of each piece shall be greater than 50lbs;
3, leather/cloth color fastness test: dry friction ≥4.0, wet friction ≥3.0;
4, leather/fabric wear resistance test: H-18 grinding wheel 300 RPM, fabric can not wear through, loss < 10%;
5. Sewing strength test: sewing strength should be ≥30lbs.
(2) Foam test
1, foam fire test: the sampling size is 12*4*0.5 inches, 10 samples, 5 of which do 24-hour aging treatment; Then it was ignited and burned for 12s with a flame height of 0.75 inches. The length of the foam burned after combustion was recorded. The burning length of a single sample was less than 8 inches, and the average burning length of 10 samples was less than 6 inches.
2. Foam smothering test: It is suitable for the flame retardant performance test of upholstered furniture materials with lit cigarettes as the fire source. The weight loss after smothering test cannot be more than 80%.
(3) Hardware test
1, screw strength test: M6 screw tensile strength ≥1100lbs,M8 screw tensile strength ≥1700lbs;
2. Salt spray test:
Use a salt spray testing machine, the concentration of 1% salt water, constant temperature 27 degrees Celsius, humidity 70%-80%, spray for 24 hours, after the spray with water to gently rinse the surface of the sample, dry the surface should not have obvious rust, corrosion and other phenomena.
1, all accessible surface paint lead content ≤90PPM;
2, sample paint surface to pass the hundred test, can not have the paint off.
3, the film resistance to humidity and heat, 20min,70℃. It should not be lower than level 3
(5) Stability test
1, the front stability: put the single sofa on the horizontal ground, for the adjustable function of the seat should be adjusted to an unstable state, in the test direction of the supporting foot placed a wooden bar to prevent horizontal tension when the side slide, wooden bar height as low as possible to 1 inch, to avoid preventing sample tipping; Fixed point: mark the center point of the cushion width first, and then mark the 2.4-inch position of the front end of the cushion. Apply a 173lbs vertical force downward at the intersection of the two points, and then apply a 4.5lbs tension horizontally forward. Conditions: During the entire test process, the product does not tip over, which is considered as passing the test.
2. Post-stability test: Use the standard 13 disks of post-stability test to pile up close to the backrest in turn. After all 13 disks are stacked up, the seat is qualified if it does not tip over.
(VI) armrest strength test
1. Vertical strength test of handrail: In this test, the sofa seat with armrest was fixed on the test platform to restrict its free movement, and the functions were adjusted to normal operating conditions. A vertical downward force of 200lbs was applied to the obvious weak spot on the armrest (a 5-inch device was installed on the armrest) for one minute, and then the force was discharged to check that the sofa could not have any damage. A confirmatory test was conducted again. A 300lbs force was applied vertically downward to the weak area, maintained for one minute, and the force was discharged, which allowed partial function loss of the product, but no major structural changes.
2. Horizontal strength test of handrail: The sofa seat is fixed on the test platform to prevent the chair from moving horizontally and tipping over, but the activity of the handrail cannot be restricted. The various functions are adjusted to the normal use conditions. A 100lbs force is applied horizontally in the weak position of the handrail (a device with a width of 1 inch is installed on the handrail), maintained for one minute, and then the unloading force is checked. The product should not have any loss of function or any damage, and then the verification test was done. Again, a 150lbs force was applied at the weak position level, maintained for one minute, and then the force was discharged. The product was allowed to have partial loss of function but no major structural changes.
(7) Dynamic impact test
1. Place the sofa on the test platform and use a 225lbs sandbag to drop freely from the position 6 inches from the height of the cushion. The sandbag should not touch the back of the sofa during the falling process. A 300lbs sandbag was dropped 6 inches from the seat height. The sandbag was removed and checked to allow for partial functional damage but no major structural changes.
(8) Sofa foot strength test
1. Select one of the sofa feet to do the test. Apply a 75lbs force to the front and back of the sofa feet in four directions, maintain it for one minute.
(9) Drop test
1, box fall requirements: one point three sides six sides;
Five, sofa product packaging inspection