The introduction for glass bottles, deep processing, and plastic accessories

1.The Composition of Glass

  • Glass is an amorphous inorganic non-metallic material, which is generally made of a variety of inorganic minerals (such as quartz sand, borax, calcite, barium carbonate, soda ash, etc.) as the main raw materials and a small amount of auxiliary raw materials;
  • Its main components are silicon dioxide and other oxides (silicate complex salts);
  • The glass we use for cosmetic and perfume bottleare also called soda lime glass. It is low cost, easy to form and suitable for large-scale production. Its output accounts for 90% of commonly used glass. It can produce glass bottles, flat glass, containers, light bulbs, etc. it is mainly silica (75%), containing 15% sodium and 10% calcium, so it is called sodium calcium glass.

2.Category of Glass

  • Material classification: crystal material, high white material and normalwhite material;
  • What is the differences?different visual effects, costs, prices,ingredients, production formulas and different quality level;
  • The whitest: crystal material,the highest cost and the most expensive, generally used in crafts;
  • The worst: normalwhite material has the worst whiteness, with yellow or green color;
  • Slightly worse than crystal but much better than normal material: We call it high white material, good whiteness and transparency.
  • Shengwei’s products: use high white materials, high-endand suitable for cosmetic and perfume glass bottle and jar.

Category From The Purpose of The Product:

  • Cosmetic bottles;
  • Medicine bottles;
  • Food& Beverages bottle;
  • Handicraft bottle.
  • Shengwei’s main products: cosmetic bottles!

Cosmetic Bottle Classifications

Cream Jar

  • The bottle topis with a screw thread mouth;
  • The bottles are short;
  • The openof the bottle is so big that you can put your fingers into the bottle;
  • 20g, 30g is used foreye cream, 50g is used for face cream, 80g, 100g is used for face mask, refers to the capacity;
  • With hand gaskets and covers, there are PE or foam gaskets in the lid.

Lotion Bottle

  • The bottle topis usually with a screw thread mouth;
  • The bottle is higher;
  • Bottle open like afinger size;
  • 30-60ml, used forfoundation, sunscreen, essence, etc., 80-150ml mainly usded for toner, refers to the capacity;
  • The accessories incl cover, inner plug, pump head and outer cover, dropper and inner plug (wiper).

Aromatherapy/Car Perfume Bottle

  • The bottle topis with a screw thread mouth;
  • The bottle topis a bit distinctive;
  • Bottle open like afinger size;
  • More than 100ml for Aromatherapy/Car Perfume Bottle;
  • The accessories are includea cover and an inner plug. At that time, the aromatherapy branch will be inserted / the cover will be opened directly.

Perfume Bottle

  • The openof the bottle has no screw teeth, it is a clamp or a tie;
  • Used for perfume;
  • The commonly used 15.3 of the bottle toprefers to the screw tooth diameter of the bottle. Of course, there are also 13.3, 18.3 and 20.3, which are rarely used;
  • Accessory nozzle (spray), there are two kinds of nozzles: normalclamping nozzle and snap-in clamping nozzle.
  • Normalperfume clip mouth nozzle, the machine is used when installation to tie a mouth, need to be installed again in the sleeve, seal the water line can not play can also be sealed in place
  • Clip-on nozzle,It can be directly pressed during installation without installing the middle sleeve. It has high requirements for the size of the bottle top, especially the water sealing line of the bottle top.

3.The production process

  • Feeding and melting:

Weighing batching——Mixing——Conveying——Feeder——Melting pool 1500 degrees——Working pool;

  • Feeding:

Feeding channel——Feeding basin——Mud bowl——Cutting——Dropping 1100

degrees——Guide pipe;

  • Production molding:

Row and column machine——Initial mold——Turnover——Molding——Molding 550 degrees——Bottle clamping——Bottle pulling——Turning machine;

  • Annealing:

Push the bottle machine to push the furnace——Annealing furnace heating 550-580 ——Holding for 20 minutes——Slow cooling process (slow cooling to 430)——Quick cooling out (annealing time is generally about 1.5 hours);

  • Inspection:

Light inspection full inspection——Packaging——Sampling inspection——Into the warehouse——Shipment.


The following will be send to a third party for testing:

  • All raw materials will be sampled at least once a year to check the composition;
  • There are several raw materials, and the composition is sampled and inspected

every month;

  • Full analysis of glass bottles, Once a quarter;
  • Four ROHS,theheavy metals are tested once a year to ensure there are cadmium, lead, mercury, hexavalent chromium not contained;
  • Water resistance test will be conducted once a year, reaching HC3 level.

Internal stress detection

  • Using stress testing, usuallythe product is qualified if you reach level ≤ 3 for glass internal stress. The unqualified product would burst open and the main method of stress relief annealing furnace annealing, the stress level 1 is the best one, with the stress gauge to watch the color, the color purple, stress is the best, no noise or interference color color.

Thermal shock resistance test

  • Use a constant temperature water bath to detect, and the temperature difference is ≥42 degrees; Put the empty glass bottles in the net basket to make them stand upright and separate, then close the net cap and immerse the net basket into the hot water tank (temperature: 64 ℃ ± 1 ℃), ensure that the container is completely filled with water and keep the top of the bottle topat least 50mm below the water surface for 5 minutes.In 16s, the hot water in the glass bottle in the net basket is completely poured off, and into the cold water tank (22℃±5℃), ensure that the container is completely filled with water and the top of the bottle open is at least 50mm below the water surface, keep for 30 seconds, and then the container in the basket is removed together from the cold water tank, and completely pour the cold water in the bottle. Observe the bottle body can not have cracks,fissures, damage and other bad phenomenon.

External pressure detection

  • Use thepush-pull tester detection, pressure value ≥ 60 kg, the bottle is placed directly under the rod scale sensor, rotate the rod, the rod weight sensor will slowly decline, the data on the display will continue to increase. When the pressure value is ≥ 60kg, the product is considered qualified. The cream bottle no need to test because the shoulder part material is very thick; Mainly detect lotion bottle, perfume bottle, especially light lotion and perfume bottle, check whether the product has thin shoulder, when the shoulder thickness is not enough, the product is easy to be damaged. At the same time, the press in force and pull-out force are also tested with this equipment.

Torque Test

  • Category of force tested using torque meter:
  • The tightening force of the screw cap and the container(the air tightness test is tested by the minimum screwing force, the inner and outer cap separation test is tested by the maximum screwing force.
  • The unscrewing force of the cap and the container (after screwing the cap with the tightening force standard, test the unscrewing force);
  • Sliding force of screw cap and container;
  • Locking-point screw cap and container advance force;
  • Locking-point screw cap and container unscrewing force;
  • Locking-point screw cap and container Over shift force.

Torque Standard

  • Customer private model: if there is a speicicstandard, then refers to the customer’s speicic standard, not according to the conventional standard;
  • Publicmold mould: according to our standard, the conventional screw thread tightening force is half of the screw thread diameter plus 1KGF, and the loosening force is half of the screw thread diameter;
  • For example, half of 20 teeth is 10, plus 1 is 11 tightening force, loosening force is half of screw 10, tolerances are both plus or minus 3 or more, tightening force is 11±3, and loosening force is 10±3;
  • The thread sizeis the diameter of the cap screw, usually 18, 20, 22, 24, etc. The screw diameter of the glass bottle corresponds to 17.5, 19.5, 21.5, 23.5MM;
  • The shift in force with buckle and the over shift force when unscrewing are the standards set during the development of new products.;
  • The sliding teeth should reach at least 25KGF above, or even more 30/35K

Tightness Test

  • The lotionbottle provides the top cover / pump / fittings (except the locating cover) with the minimum capping torque, and the lid has a clamping point structure, if only the lid is in place;
  • Fill the bottle with colored water of filling capacity, and pad white paper under the opening;
  • Start the vacuum leak detector, -0.06MPa, test for 10 minutes;
  • Open the vacuum leak detector and put it standafter taking it out, tap the cover several times, and then unscrew the cover to observe whether there is leakage; If there is liquid leakage on the white paper, directly determine the liquid leakage of the test sample placed at this position;
  • Fill the cream bottle with colored waterof full capacity, cover the product and accessories with the specified minimum capping torque, pad white paper under the top, and observe whether there is liquid leakage after placing it upside down / on the side for 24 hours.

Weight And Capacity Test

  • The standards refer to the drawings. The internal standards of Shengwei are stricter than those of the customers;
  • The weighttolerance is generally ± 5g~+±7g; We use ± 5g as test standard;
  • Capacitytolerance , usually for lotion and perfume, 80 ml or above by + 3 ml, 50-80 ml below 2.5 ml, 50 ml below + 2 ml; The skin cream bottle shall be ± 3 g for more than 50 g, ± 2.5 g for 30 g and ± 2 g for less than 30 g;
  • This standard has a national standardwhich is GBT 21299-2007 glass container capacity tolerance. We will follow this if this standard are higher than that was given by our customer.


  • Using an electronic scale to detect the weight of the bottle, sometimes because the volume is not in the middle value, there will be slight adjustments, usually based on the volume; the density of the glass is 2.5g/1ml, which means that the weight of the bottle increases by 2.5g, and the volume is It will be reduced by 1 ml. On the contrary, for every 2.5 g of the bottle’s weight, the capacity will be increased by 1 ml;
  • For example, the bottle weighs 100g and has a capacity of 50ml. Sothe bottle is 105g, the capacity is 48ml.
  • When the bottle weighs 100g and has a capacity of 50ml. The bottle is 97.5g, the capacity is 51ml.


  • Full capacity, the capacity we generally detect is full capacity;
  • The other is the filling capacity, and the filling capacity is the customer’s requirement. For example, some customers require that the capacity of the shoulder or the first ring of the screw tooth must be controlled. However, generally, we suggest to usethe full capacity to test, and the filling capacity is easy to have controversy;
  • The easy way to test the capacity: use an electronic scale to test, first weigh the bottle, and then fill it with water until it is flush with the topof the bottle. The total weight obtained minus the weight of the bottle is the mouthful capacity.

Dimension detection

  • Inner diameter of bottle top: measure with caliper. The standard is ± 0.3mm. Put the caliper into the bottle topfor about 3mm and get two values, one at the clamping line and the other in the vertical direction of the clamping line;
  • Control purpose: prevent the inner plug / hand-held pad from being too tightly, the inner plug rebounds, the inner plug and hand-held pad cannot be installed, the inner plug and hand-held pad are loose, and the seal is not in place.
  • Thread outer diameter: Measured with a caliper, the standard is ±0.3 mm. The caliper is attached to the maximum outer diameter of the bottle thread, one is next to the parting line (avoiding the parting line), and the other is the vertical direction of the first point.
  • Control purpose: when the size is big, the cover can not be screwed onmatching cover, and when the size is small, the cover can not be tightened and the sliding thread
  • Bottle body diameter: measured by caliper, the standard is between ± 0.5 -1.2mm. The caliper is placed at the maximum outer diameter of the product and reads at the maximum point. The square product diameter needs to be measured in both directions;
  • Control purpose: a biggerdiameter will affect the outer packaging of the carton after the customer make the finished product. Resulted the finished product is loose and the protection is not in place. Or even worst that the diameter too big will cause the capacity to be too large. The diameter is small and the capacity is too
  • Head and neck height: measured with a depth gauge, the standard is ± 0.3mm.

Close to the thread on the top, one end of the gauge contacts the top of the bottle, press the depth gauge, and read the value from the test rod to the bottle shoulder;

  • The total height can be measured with a height ruler first, and then the height of the bottle. The head and neck height can be obtained by subtracting the height of the bottle from the total height;
  • Control purpose: the head and neck height is short, the covercan not be sealed properly when screwed on, or it can be sealed but there is no gap in the fit, resulting in a shoulder break. The head and neck are high and after screwed on the cover the gap is big, look ugly.
  • Depth in bottle: measure with depth ruler / thin rod depth ruler, the standard is ± 2mm, Let both ends of the depth ruler contact the topof the cover, put the measuring head in the center of the bottle and read the value;
  • Control purpose:

For products with dropper and pump head, if the depth in the bottle is too deep, the dropper can not touch the bottom of the bottle, and if the depth in the bottle is too shallow, the dropper can not be installed;

The same situation for the pump head. If the bottle too deep, the pipe of the pump head cannot touch the bottom, if too shallow, and the pipe of the pump head is bent too much, not good looking;

 In addition, for products without pump head or dropper, same model, some bottle bottom  are thick and some are thin, also look ugly.

  • Total bottle height: use a depth ruler / height ruler, usually ± 1-1.2mm, stick to the bottle body, measure the distance between the bottom and top of the bottle, measure again in the vertical direction, and record the maximum value of the two measurements;
  • Control purpose: If the total height of the bottle is too high, the customer’sbox packaging can’t fit, if the bottle body is too short, the customer’s box will be loose, and the protection is not enough.
  • Bottle bottom thickness: Our current bottles are usually about 10mmfor costmetic bottles. Some special products bottom thickness reach about 15mm. When the bottom is too thick, the bottom thickness position will be deformed due to molding problems, and the machine speed is low, affecting the output. But we can sure make the bottom thickness more than 15mm or even more than 30mm. We also have a 9s machine speical for pumfure bottle with thick bottom bottle. This machine have obvious advantages in producing these thick bottom product when the product weight is more than 200g.
  • Matchclearance: the standard is normally1-1.0mm when measured with a feeler gauge. After fiting the bottle, measure the fit clearance between the cover and the bottle with the standard feeler gauge along the shoulder of the bottle to see the maximum and the minimum clearance. It is good to control it from 0.2 to 0.8mm, and the difference between the maximum clearance and the minimum is within 0.3mm;
  • Control purposes:If no gap, The matching cover or accesories will rub the bottle shoulder and the spray coating will have scratch, the lotion bottle may have shoulder breaking, if the lid with big clearance, it will look But fortunately, the gap can be control by controlling the head and neck height.

Overall Coordination

  • The matching of bottle and cap shall not be too tight orloose, internal plug rebound and internal plug rotation.Customers with strict requirements also demand that the pressing force and pulling force of the inner plug which the inner plug shall be greater than 5kg, less than 15kg, and the pulling force shall be greater than 3kg.

The cover shall be smooth without resistance and tightness. There shall be no sliding teeth and rotation within the specified torque. The tightening and loosening force meets the requirements, The gap shall meet the requirements, and there shall be no obvious skew visually.

The dislocation between the bottom of the accessories and the bottle shoulder shall be ≤ 1mm. The shoulder sleeve shall not be loose or tight. Customers with strict requirements also have the requirements for the pressing force and pulling force of the shoulder sleeve. Those with positioning points shall have positioning feeling, hand feeling, and the direction of the directional cover shall be aligned to complete a basic glass smooth bottle. 

5.Defect Category and Sampling Plan

Defect Category and AQL

  • the critical defect is harmful to human safety or health; Zero accepted
  • Class B defects are serious defects that affect the use. AQL0.65
  • Class D defects are general defects and important appearance indicators. AQL1.5
  • Class D defects are slight, and the appearance indicators are unqualified. AQL2.5
  • Sampling plan
  • Standard GB/T2828.1-2012
  • The appearance shall be inspected according to the normal one-time sampling plan, and the general inspection level is level II.
  • Special inspection level S-3 is adopted for function inspection.

6.Appearance defect

Foreign matter

  • Insects, hair, broken glass and metal in the bottle or box are zero accepted not allowed;

Burst and damage

  • Under the light,we can seethe crack will be bright, reflective and white. It is easy to see under the fluorescent lamp. It is particularly obvious after frosting.

The bottleneck, bottle top thread, bottle shoulder mold closing line, bottle bottom and other positions will appear. Usually, there are neck crack, opening burst, thread burst, head and neck burst (beheading), bottle body burst and bottle bottom burst. Generally, penetrating bottle opening burst is not allowed.

Bottle opening defect and bottle shoulder defect.

  • Bottle opening notch;
  • The inner openingof the bottle is not full. Look from the top to the bottom of the bottle, it can be seen that the bottle opening is concave inward, affecting the sealing.
  • The bottle openingis not round;
  • The bottle mouth is not well formed and flat. Look from the bottle mouth. Affect fitting and sealing.
  • Burr in topof the bottle;
  • There is extra glass at the inner mouth of the bottle. The burr shape is zero accepted, or there are scars at the inner mouth of the bottle, which affects the sealing.
  • large and small openingand trapezoid opening;
  • From the top to the bottom, the innertop part of bottle is like a horn, and the inner opening of the bottle is too large or too small; notsealing well.
  • Big head and fat head;
  • Looking at the threadposition at the bottle opening from the side, there is glass swelling and bulging.This kind of problem usually make the bottle can’t match the cap.
  • Bottle mouth clamping line burr;
  • There are hairy thorns at the position of the bottle clamping line. You can seethat there are sharp corners at the position of the clamping line, which can scrape the hand, grind the cover, sometimes the old mold will have this problem.
  • Uneven bottle top;
  • It usually appears on thebig opening When the bottle is placed upside down on the glass, the obvious unevenness can be seen. It can be judged as pass product if it can not be plugged with a 0.3mm feeler gauge in four directions. If it exceeds the standard, the sealing effect will be not good.
  • Head skew and head displacement;
  • Visually check that the head and neck of the product is skewed or the head is offset to one side, which can be clearly seen when it iswith the cover.
  • Insufficient bottle shoulder;
  • The shoulder shape of the bottle is not full enough.
  • Thin shoulder;
  • The shoulder material is too thinnot even reach 1.5mm.
  • Clamping line thick / misplaced;
  • Bottle shoulder clamping line, with scraping hands or with obvious steps.

Bottle Body Defect

Bottle Body Skew

The body is crooked, the bottle is not well formed, and there is skew. It can be seen by visual inspection that it affects the appearance and filling. Usually the high bottle with small bottom will be easy have this kind of issue. Normally, it can’t be more than 1.5 degrees.

  • The bottle body is deformed and uneven;
  • When youtouched by hand. It feels uneven, which affects the coming processing or even the capacity, and can’t be used at all.
  • Bottle body water mark , material stamp;
  • The bottle body has lines like water ripples withone or more marks, which generally appear horizontally. It can be seen by visual inspection and the hand can feel for it, which look very ugly unaccepatable.
  • Wrinkled skin and material knot;
  • The bottle body is wrinkled or there is a mark like the clamping line on the body, which can be seen clearly. The hand feeling will also be obvious and unacceptable, affecting the appearance.
  • The bottle body is not smooth andhave cold spots;
  • By visual inspection, the bottle hazy opaque, and it feels slightly uneven by hand. After painting solid color this defecive will bevery obvious.
  • Clamping line is thick or misplaced;
  • The clamping line can be seen visually. It can be obviously felt by touching the clamping line with hands. The position of the clamping line is misplaced or raised / scraped.
  • Clamping line concave;
  • Touch the clamping line by hand and obviously feel the concave position of the clamping line. The post-processing solid color or electroplating process will be obvious and affect the appearance.
  • DoubleMould Seam;
  • There are two mould Seamon one side of the bottle body at the same time, mainly because the forming mold is not aligned with the initial mold. There are two mould Seam, which can be clearly seen by visual inspection. There will be a slight but not thick, within 2MM.
  • Bruises/scratches;
  • Visually, it can be seen that the two bottles collide together to produce scars. After the frosting it will be easy to find. The main reason to causethis is frosting processing. Generally, silk screen spraying and light bottle links will not occur.
  • Uneven feeding of bottle body;
  • When you look at the bottle, you will seethat the bottle is uneven, or the inner wall of the bottle is not smooth. The inner wall of the bottle is divided into two sections. Normally the lotion and perfume bottle will have, and the cream jar will not have. Because they use blowing to produce glass bottle. The higher the bottle is, the more obvious it is. After the toner or loitoin is filled, it will look better.
  • The uneven shoulder can be found in any product, mainly because ofmold design and operation, but sometimes it is also related to bottle shape, poor blanking, etc
  • Sticking mold;
  • It usually happenat the bottom of the bottle where the material is thick, one or more dents can be seen.

Bottle bottom

  • Bottle bottom burst;
  • When visually inspect the bottom of the bottle, you will see thebright, reflective and white under the light. It will be very obvious after frosting.
  • Thick and thin bottom;
  • For the same model product, some bottles have thick material inside the bottom, and some are thin.
  • Inclined bottom;
  • For the same model bottle, uneven alignment inside the bottom of the bottle, and the materialat the bottle bottom is one side high and other side
  • Baffle move up;
  • There is a circle of line at the bottom of the bottle, which is calledbaffle, but the line can not move up to the bottle body. Moving to the bottle body as above, we call baffle move up, which look ugly.
  • Uneven bottom,swing bottle;

The bottle swings left and right on the table or glass. Generally, it cannot swing for more than 3 seconds, otherwise it is fail product. Generally, the anti-burst strip at the bottom of the bottle not enough, which will casue this problem;

  • Bottom uneven;

 Normally, it happen on the cream jar. The larger the bottom, the easier it appears, which will affect the capacity. It shouldn’t have obvious concave convex, and very obvious after the solid color painting.

  • Cut-off scar 
  • The product has a water splash shape, called cut-off scar , which usually appears at the bottom of the bottle, but sometimes appears at the bottle body or shoulder. It will be at the bottle body and shoulder. If appears in the bottle and the shoulder of the bottle will be judged to be defective product, few in the bottom of the bottle can be acceptable, cut-off scar like wrinkles exist because each drop of material is cut.

7.Appearance defect


  • Bubbles include surface bubbles, broken bubbles andinner Surface bubbles or broken bubbles are not accepted; 1-2 inner bubbles less than 0.6mm are ok. Noramlly, dense bubbles are not allowed. The customer requirements of inner bubbles are different. Unfortunately, this problem can not be completely eliminated during production, but can only be screen out by full inspection;
  • Dirty material, stones, sand holes;
  • The bottlelook like sand appears is called stones / dirty material. If there is a small hole on the surface we called sand hole, which is also not accepted and cannot be 100% avoid. Have to be screen out by full inspection.
  • Stripe, screw pattern, cat scratch pattern;
  • All of the above are essentially the same pattern. They produced inside the material. The surface is like being scratched by a cat. Sometimes there are only one and sometimes multiple stripes. They are unacceptable.
  • Oil spots / putty, Pitting, Black spots;

There are oil stains, putty or black spots on the surface. Pitting is because many small spots on the bottle body; Black spots are small black spots on the surface, which are usually produced by oiling. The cream jar is made by pressure blowing. So we should be aware of this as they will more likely have black spots at the bottom of the bottle. They are easy to appear if they are not well controlled.

  • Rust;
  • The bottom of the bottle or the shoulder or body of the bottle is stained with yellow rust stains.
  • Other contamination;
  • Some powder or other contaminants on the surface.
  • Moldy and Re-alkali;

The product may go mildew and re-alkali inside or outside the bottle for more than half a year in stock, some of which are similar to snowflakes, when this happen the bottle needs to be cleaned again before delivery.


Process (A process in which glass bottles are soaked in frosting liquid)

  • Frosting with cleaning:

Products to be frosted——Insert the bottle opeing into the fixture——Into the acid pickling tank for about 10 seconds——Into frosting liquid tank for about 20 seconds——Reduce the frosting liquid in the filtrate tank for 10 seconds——Clean pool cleaning——Acid washing pool to wash off the bottle frosting liquid—— Into water clean again——Pull out the bottle and put it into the drying oven——Packed.

  • Frosting without cleaning:

Like the above processes, without the first acid pickling tank, but without this usually the bottom rust is not clean enough;

  • Wash the inside and outside of the bottle:

Bottles into plastic case- completely soaked into the acid pickling pool – two/three times clean with fresh water – dried in drying ovens – packed.

  • Bottle washing outside/shallow sanding.:

Additional process is the bottle top will be inserted into the fixture in the first process. The rest processes are the same.

Bottle loading (insert the bottle opening into the fixture)

Clean the cream jar opening and then into the drying oven

Packing of finished products after drying

  • Frosting quality problems;
  • Light leakage / light transmission: some parts of the product cannot be covered with sand after frosting. During inspection, the product is tested against the light source, and the product shows star dotted light transmission, which is now light leakage / light transmission.
  • Frosted powder;
  • White powder remains on the surface of the product, which can be clearly seen only after the bottle is dry, can’t seewhen it is wet. Pay special attention to the bottle shoulder, material grain and screw thread
  • Uneven Frosting / frosting watermark;
  • After the product is frosted,there are watermark / fingerprint on the bottle surface , which is mainly caused by uneven frosting. If it can be erased, then it should be the water quality issue.
  • Scratches / Scuffs;
  • After frosting, the bottles collide and rub, and the frosting bottles are particularly obvious. We should pay more attentionto the processing and post-processing of frosting bottles, which will affect the appearance.
  • Thread frosting ;
  • During frosting, the medicine soakedinto the thread, because the fixture is wrong / the fixture is broken / the bottle is not inserted well, resulting the excessive frosting of screw teeth.
  • Obvious material pattern

The glass bottle has a material pattern itself , and the mixing of the potion is not very good, resulting in obvious material pattern after the product is frosting, and there is a material pattern in the product.

  • Frosting is too coarse;

The soaking time of liquid medicine during frosting is too long, or the frosting wrokshop finds that the product leaks light and performs secondary frosting after frosting. This is difficult to see but usually known by touching it with your hand. You will feel that the surface is very rough. The products with coarse frosting and unacceptable, some translucent products are not glossy and will be lusterless when used for plating.

9.Silk Screen Printing

  • The content of silk screen printing shall be consistent with the confirmed sample, without wrong printing, missing printing, overprint, incomplete or garbage patterns and words, touch patterns, obvious font blur and overlapping images;
  • Silk screen printing position: consistent with the sample, without skew and left-right deviation, generally: left-right ± 1mm, upper and lower deviation: ± 1mm; Upper and lower overprint deviation ≤± 1mm, left and right overprint deviation ≤± 1.5mm;
  • The size, handwriting thickness and color of silk screen text are consistent with the sample;
  • Contamination, the surface of the bottle shall not be stained with excess ink and other varias;
  • Adhesion test,cover the test part with 3m810 adhesive tape so that there are no bubbles in the covered part. After smoothing, stay for 1 minute and tear it off quickly at an angle of 45 °. The same part shall be test twice. The adherend is punctate / the falling off area is ≤ 5% / the surface layer falls off, and the wording and appearance shall not be affected.

10.Hot stamping

  • The hot stamping position, color and luster shall be consistent with the sample;
  • There is no wrinkle, crack, deformity, pitting, blistering, flash (sawtooth), stain, scratch, etc. in the hot stamping part;
  • Adhesion test,cover the test part with 3m810 adhesive tape so that there are no bubbles in the covered part. After smoothing, stay for 1 minute and tear it off quickly at an angle of 45°.The same part shall be subject to twice. The adherend is punctate / the falling off area is ≤5% / the surface layer falls off, and the reading and appearance effects shall not be affected.

11.Spraying / electroplating

  • Color, if it is a gradient, the position shall be consistent with the samples. For samples with upper and lower limits of color, it shall be within the upper and lower limits;
  • The position is the same as the frosting requirements, and can not be sprayed to the thread position;
  • There shall be no sand hole, light leakage, pitting, uneven coating (scattered oil / accumulated oil) or dust and garbage impurities, no bruise, paint falling, obvious scratch, scratch and scratch, and no scratch exceeding 10 * 0.3mm;
  • Adhesion (100 grid test) draw 10*10 (100) 1mm*1mm small grids on the surface of the test sample. Each scribe shall be deep enough to the bottom of the paint, and the surface shall be cleaned,cover the test part with 3m810 adhesive tape so that there are no bubbles in the covered part. After smoothing, stay for 1 minute and tear it off quickly at an angle of 45°. The same part shall be test twice.  the falling off area is ≤5% .

Quality policy: Keep improving, continuous improvement