Basic knowledge and quality testing of accessories

 

1.Leather: The leather can be divided into dermis and imitation leather (artificial leather) and silica gel leather

 

 (1)Type

   ①Dermis (natural skin) has natural pores and skin texture on the surface layer and strong toughness. It feels smooth, soft and elastic with the touch of the hands. There will be the smell of burning meat and hair

       after burning. Commonly used cowhide, cattle embossed leather, sheepskin, horse fur and other leather, two times processed semi-finished products.

   ②The imitation leather (artificial skin), including PVC, PU, super fibrin skin and so on, made mainly of petroleum chemical products (alginate fiber bottom), resin composite material and so on. The leather feels harsh,

       rigid and poor softness, and has a strong smell of plastic. It has a pungent odor after ignition, and it will form lumps

   ③Silica gel leather also known as polysiloxane resin, is a polymer of organic groups

 (2)Testing

   ①Color test: Color should meet the requirements, refer to color cards or templates, color difference phenomenon must be confirmed before acceptance

   ②Thickness test: Generally according to the distance between the equidistant acquisition head, middle and tail of three points, the error of double-layer is (+0.4MM), single-layer 0.2MM

   ③Color fastness test: Using adhesive tape to peel film test (stick to the same place for five times), or use the white cloth to rub the leather repeatedly (the same position, rub back and forth for 10 times), do not fade or slightly fade

   ④Environmental test: According to the European and American standards, DMF (two methyl formamide) cannot have, heavy metal lead content is not more than 0.1mg, 22 carcinogenic dyes banned.Formaldehyde content

      and mold inhibitor content requirements, specifically depending on customer requirements

 

2.Semi jewel

 

    There are cracks, sand holes, impurities, variegation, color differences and other problems, the defect within a certain range, is acceptable. Because this is made of natural materials, for dyeing or plating color difference

    reference to the standard of prenatal samples and customers have special requirements to be explained in advance.

 

3.Cat's eye/tiger eye stone

 

   ①Must have a good cat's eye gem effect, not too thorough, the grain thickness and direction to be unified

   ②There should be no impurities, raindrops, defects, variegation and other issues

   ③Half of the surface needs to be fitted, first check whether it can be fitted, cat's eye stone color allows for a difference of less than 10%

   ④Color vision is different when the same material is used to make different shapes/sizes of products

   ⑤The color of paint need to be unified, the oil color should be uniform and bright, the surface can not have dust, impurities

 

4.Zircon

 

   ①Domestic zircon is basically produced in Wuzhou, Guangxi, generally synthetic, also known as cubic zirconia

   ②Commonly used zircon color, colorless, purplish red, violet, golden yellow, pomegranate red, olive green, champagne, pink, apple green and so on are high-temperature resistant discoloring color system; Smoked zircon,

      coffee zircon, blue zirconium, black zirconium and green zirconium are high-temperature discoloring lines.There is a certain chromatic aberration according to different grades, especially after the high-temperature wax is inlaid.

   ③According to quality, zircon can mainly divid into A (AA, AAA) and B goods. The company currently purchases AAA zircon, and there is basically no color difference in color. The pavilion and baseplate surface is uniform,

      no bottom leakage, sand angle, etc. the size control error is + 0.03mm

 

5.Other beads

 

   ①Pearls / glass pearls: The size of glass pearls is uniform and the color adhesion is strong, and it can be decolorization through testing and the surface must be absolutely smooth and bright, and there must be no stain,

      scratch, color difference, sand point and so on; Natural pearls are allowed to vary in size and shape, allowing for some minor blemishes, color will be uneven when natural pearls are dyed. Different batches of color will have

      the color difference is a normal phenomenon

   ②Plastic beads / acrylic beads: Allowing parting line, slight shrink, gas & water-mark, small bubbles, scratches, impurities, variegated and other minor defects; Not allowed to be short of glue, obvious burr, scorch and serious

      shrinkage and obvious gas & water-mark, small bubbles, scratches, impurities, variegated.

   ③Silica gel beads: The color needs to meet the requirements that according to the color card or template. The surface is free from impurities, stains, no obvious smell. The mold line is uniform and not thick. The

      environmental requirements are specific to the requirements of customers

 

Basic knowledge and test of workmanship

 

1.Polishing of hardware

 

   There should be no sand holes, die lines, pockmarks and so on. Smooth polished surfaces are mirror effects and they must not be worn or deformed; The corners must also be polished and after polishing, the ligand lines must           be kept fluent.

 

2.Burning welding

 

   The soldering is firm and the welding position is unified. According to the quality and the stress condition, the most suitable solder (the different purity of tin, copper, silver, etc.) is selected. The size of the solder joint is moderate,

   and there should be no big welding scar. The non-back or concealed solder joints need to be polished strictly.

 

3.Inlaid

 

   ①The claw diamonds should be in place and flat, and the paws should be flattened. When the strength is enough, the paws can be made as small as possible so as not to hide light or claws harm to diamonds. The diamonds

   must be firm and cannot be swaying.

   ②The embryo body beneath and around the waxed zircon was hollowed out as far as possible for daylighting.

 

4.Stick stone(rhinestone)

 

   Small stones stuck in the middle and use slow dry transparent AB adhesive. The glue must be used properly, and it should not be spilt. The stone is in place and solid to pass the drop test. For large area sticky drill, drill bit 

   should be dense, if there is no nail position, the drill should bigger the platform than 1-2PP#, to show more high-grade drilling.

 

5.Grinding glue

 

   Glue class

   ①The glue class effect is after electroplating

   ②The color of dropping glue should meet the requirements, referring to the color card or sample

   ③There are flat surface and arc surface depending on the effect, and the plane should not be too convex or hollow, and there should be no pores or impurities

 

6.Leather oil edge

 

   The oil edge is smooth and uniform, and the color can be matched with the main color, without obvious pores, convex, etc

 

7.Assembled viscose

 

   The selection of assembly glue directly affects the quality and life of the product. So we do not use double-sided adhesive, quick drying glue, and some other adhesives which are low-viscosity, brittle and easy to be aged. The

   adhesive position is correct and firm, and it can pass the drop test, aging test and tensile test.

 

8.Packing

 

   ①For conventional requirements, the finished goods box must be marked with size, net weight, gross weight, number (color), quantity, PO#, guest mark, origin and so on. The gross weight cannot exceed 25KG, and the outer

      box is generally A/B paper and 3 pit box.

   ②All products must have desiccant.

   ③The way of packing depends on the requirements of the customer.

 

Electroplate Process test items:

 

1.Water electroplating

 

 (1)Poor electroplating

   Blistering: The phenomenon of surface bulging caused by bad adhesion between coating and base layer

   ②Desquamation: The coating and the substrate adhesion is not good, the coating from the base peeling off

   ③Scorching: There are different colors between the local coating and other surface coatings, and the surface is rough

   ④Uneven color: The uneven color of electroplating, the local color difference

   ⑤Impurities: Coating surface due to attachment to other metal particles (convex), resulting in the rough surface

   ⑥Blue film (color): Observe the surface of the coating can be seen a blue reflection

   ⑦Exposed substrate: The surface of the product is not completely covered by the coating

 (2)Non-electroplated surface defect

   ①Collision: The concave mark on the surface of the coating caused by collision

   ②Scratch: Linear marks were made on the surface of the coating by sharp objects

   ③Scraping: A slight linear mark (force rack or electrophoresis flower) on the surface of the coating rubbed by a hard object

   ④Watermarking: Electroplating solution left on the surface of the coating after electroplating

   ⑤Wave surface: Before electroplating, the surface of the product is not smooth, after electroplating can be seen in the coating wavy

   ⑥Sand hole: Imperfect embryo itself with obvious sand hole electroplating is unable to cover up

 (3)Water electroplating test project

   ①Environmental protection requirements, lead and nickel testing to meet the requirements, the general electroplating manufacturers have environmental protection assurance

   ②Thickness requirements, according to customer requirements, provide test reports

   ③Protective layer test, potassium sulfide test, ammonium sulfide test, sweat test, or according to the customer to do salt spray test, meet the relevant requirements

 

2.Vacuum electroplating

 

 (1)Poor electroplating

   ①discoloration, blackening and lusterless

   ②The color difference plating is not uniform, and the gloss and color of the product surface are not uniform

   ③Oil attached,  the oil is attached to the surface of the product

   ④Fine scratches, no deep scratches

   ⑤Hard scratches, deep scratches

   ⑥Bruised, damage to the surface of the product caused by external forces

   ⑦Leakage, the product does not dry, there is water out (hollow products)

   ⑧Pock, the surface of the electroplating layer appeared granular defects

   ⑨Coke, due to excessive current plating and other reasons caused by the defects

   ⑩The coating is rough and the surface of the coating is not smooth

 (2)Vacuum test project

   ①Wear resistance, 24-48 hours wear resistance test

   ②Color fastness, 24-72 hours salt spray test

 

Product detection

 

1.Necklaces

 

 (1)The length error of the 16" necklace is -0.25" and +0.5"

 (2)The length error of the 18" necklace is 0.5"

 (3)The length error of the 36" necklace is 1"

 (4)Length measurement is the position from the lobster buckle to the first single lap

 (5)All necklace must pass a tensile test of more than 2KG (about 5 pounds)

 (6)Lobster buckle elastic smooth in place, open and close test 150 times

 (7)All single lap should be closed and 0.5mm single lap should be spot welded

 (8)The normal size of the lengthening chain are 2" and 3"

 

2.Ring

 

 (1)Ring perimeter measurement has an American Standard (such as 6#/7#/8#)

 (2)The standard error is ±0.1 according to the US standard and other requirements are customer oriented

 (3)The routine size of the ring perimeter is 7#

 (4)Customer's requirement is 6#7# for opening ring refers to the closure 6# opening 7#

 

3.Bracelet

 

 (1)The internal diameter error of the circular bracelet is ±1mm

 (2)The inner diameter error of C-shaped open bracelet is ±5mm and the opening error is ±5mm

 (3)The Bracelet must have a certain degree of hardness and not be easily deformed when the relative area of the bracelet is relatively small

 (4)The length of the two ends of the adjustable spring Bracelet should be the same, the elasticity is good, and the static inner diameter error is ±2 mm

 

4.Hand chain

 

 (1)The length of the conventional hand chain is 7.5". The length error is -0.15" and + 0.25"

 (2)The regular size of the extension chain is 2 "and 3" two

 (3)All hand chain must pass a tensile test of more than 2KG (about 5 pounds)

 (4)All single lap should be closed and 0.5mm single lap should be spot welded

 (5)The knot in the dark, must be the double line head which is moderate in length and short, a little bit of glue for the knot, cannot shave hands

 (6)Elastic line with the size of matching beads, other requirements on the basis of the customer

 

5.Earring

 

 (1)Conventional Ear Needling is not electroplating

 (2)Ear needling head (including auricular hook) should not be hypertrophic, non-smooth and burred

 (3)The earrings will be divided to the left and right, and the matching needs to be correct

 (4)Plastic rear bundle and bullet rear bundle should be medium elasticity, and the posterior bundle of butterfly should be flexible and smooth

 (5)The ear clips are usually white, and the ear clips should not exceed the earrings

 (6) All Earring parts should not be sharp and burred to avoid skin injury

 

Related test requirements

 

 It meets the testing requirements of our company and may do other tests according to the characteristics of the products or the requirements of customers and industries

 

1.Color fastness test

 

   Mainly for spraying or dyeing materials: spray the alcoholic perfume on the surface of the product and wipe it with the white cloth. If there is no fading, it is regarded as passing the test

 

2.Electroplating protection test (reference Electroplate Process test items above)

 

   Can be sent to third parties for the salt spray test as required by the customer

 

3.Safety packaging test

 

   The finished product box is loaded 1 meter away from the ground to do drop tests each side which order of fall is upper, lower, front, rear, left and right. Then the product is inspected. If the product is not damaged, it is

   considered to pass the test. The reverse is deemed not to pass (similar products, packaging, can be combined to do the test). The tested whole box product should be fully checked or increase the sampling volume. The total

   weight of each case should not exceed 13 KG,special should not exceed 20kg.

 

4.Tensile test

 

   ①Necklaces must be tested by more than 2KG pulling force

   ②Bracelet must be tested over 2KG pulling force

   ③Earrings generally do not require, specific customer requirements shall prevail

 

5.Drop test (impact resistance)

 

   Finished products or accessories (water drill balls, clay stones, etc.) without any packaging, from the ground (hard floor) , 0.9-1.2M high drop four times, the material must remain intact

 

6.Anti-aging test

 

   The object is baked for 30 minutes in an oven (65 C) and then frozen (below 0 C) for 4 hours. Check whether the material keeps the original quality, and then exposure 4-8 hours in the sun to check whether the appearance

   and color of the object is obviously changed, and observe it in moist environment for several days. Generally speaking, there is no customer without this requirement, or the customer's requirement shall prevail

 

7.Attachment strength test

 

   ①Scope:Oil injection, transfer printing, bronzing, silk printing and clay stone parts are included in the products

   ②Dyeing and spraying paint:Paste 3M adhesive paper on it directly and tear it at 45 degrees to see if it is discolored

      Clay Stone:Use 3M adhesive paper to stick on it, tear it at 45 degrees to see if there is any sticky stone

   ③Before testing, it is necessary to ensure that the surface of the test object is completely dry

 

8.Heavy metal test

 

   It can be sent to SGS or other designated authoritative organization for testing according to customer's requirement, and the specific testing items can be carried out according to customer's requirement

 

9. Products that fail to pass the test must be approved by the company's general manager before they can be shipped. Others have no authority to approve the shipment without authorization

 

Requirements for revision of quality control procedures and quality manuals

1. All supplier incoming and external inspection products, if there are any abnormalities in the inspection, should be carried out in accordance with the company's quality control procedures.

2. The product knowledge and other testing requirements not yet compiled in this manual can be carried out according to the company's usual quality activities.

3. The final revision authority of this manual is the responsibility of the Quality Department of the company.

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