Keyboard Quality Control Inspection Service

1.Appearance
2.Quantity check
3.Barcode Scan
4.Material check
5.Basic function check (Assembly)
6.Rubbing test
7.Odor test
8.Bluetooth device selection and connection
9.Bluetooth 10m distance test
10.FN multimedia function
11.Sleeping set function
12.Battery charge test
13.USB/BT mode switch
14.Standby current
15.Working current
16.Battery discharge test
17.Inner structure and electronic check

Large Mower Quality Control Inspection Service

Large Mower Quality Control Inspection Service

Some common factors for large mower quality control:

Appearance

Quantity check

Measurement(major size)

Basic function test(Functions on product specification work)

3M tape test for Logo

Barcode scanning

Large Mower Quality Control Inspection Service

Electric water heater inspection

Electric water heater inspection

1. Visual inspection standards and inspection methods:

Surface grade

Class A surface: an external surface that can be viewed directly, such as the front and front sides of an electric water heater, hereinafter referred to as the A surface.

Class B surface: Inconspicuous external surfaces, such as the rear and rear surfaces of electric water heaters, hereinafter referred to as the B surface.

Class C surface; internal and external surfaces that are not easily visible, such as the floor surface of electric hot water, hereinafter referred to as the C surface.

Inspection environment

Luminosity: Normal light or 200-300LX (equivalent to a distance of 750mm for a 40W fluorescent lamp) The inspection surface of the product should be approximately 45 ° from the visual direction of the inspector.

The distance between the inspector’s visual direction and the surface of the product to be inspected is as follows:

A surface: 400MM B surface: 500MM C surface: 800MM

Degree of defect

Basic method for judging the degree of surface defects: under a standard inspection light source, the distance from the observation object is 400mm, and it should be at an angle of 45 degrees with the observation surface. Defects that are not visible at a glance are slight defects, visible at a glance, but not very obvious, are general defects. Visible and obvious defects are serious defects, and defects that are visible at a glance and seriously affect the appearance are fatal defects.

Defect sampling

Appearance is based on 1dm2. The 11.3cm circle selects the most defects.

Inspection methods and inspection standards

The A side should be smooth and flat with no obvious defects. No serious defects are allowed. No hand-painting is allowed to repair defects. Minor defects are allowed. No rough feeling or deformation can be felt by hand. The insignificant general defects have a diameter greater than 1mm is not allowed, less than 1mm is not allowed to exceed 10 points, and the concentration is not more than 3 / cm2. For non-orthographic planes, the standard can be appropriately relaxed. In the detection area, the diameter is less than 1mm. It is not allowed to exceed 15 points, and the concentration is not more than 3 / cm2.

The B surface should be smooth and smooth without obvious defects. No serious defects are allowed. Minor defects are allowed, and there is no rough feeling or severe deformation when touched by hand. Non-obvious general defects are not allowed in the detection area with a diameter greater than 1.2mm and less than 1.2. mm is not allowed to exceed 20 points, and the concentration is not to exceed 3 / cm2. For non-orthographic planes, the standard can be appropriately relaxed. In the detection area, the diameter is less than 1.2mm. It is not allowed to exceed 30 points, and the concentration is not more than 3 / cm2.

The C-plane allows the presence of general defects and serious defects that do not affect the appearance quality. The splicing gap is less than 1mm, which is acceptable. If it is more than 1mm but less than 1.5mm, it can be conceded according to the actual situation, and more than 1.5mm is unacceptable.

Signs, stickers, print inspections

Check the position of the signs, logos, stickers, and silk screens in accordance with the technical data to check that they are accurate, flat, and free from obvious skew. Failed.

Inlet and outlet pipe inspection

Check the water inlet and outlet pipes. The mouth of the pipe should be smooth and smooth, and the wire teeth should not be damaged and no obvious skew. Meet the requirements as qualified, otherwise as unqualified.

The exposed length of the inlet and outlet pipes should meet the design requirements. The length of the inlet and outlet water pipes shall meet the design requirements.

2. Structural parameter inspection standards and inspection methods

Dimension inspection

The overall dimensions of the product and the dimensions of the packaging box need to meet the dimensions and tolerance requirements of the design drawings, and those without tolerances are implemented as free tolerances.

Inspection with external dimensions

The size of the external fit must meet the size and tolerance requirements of the design drawing, and the free tolerance is implemented if no tolerance is marked. The outer cymbal fittings should be free from obvious skew.

Content volume inspection

Fill the container with water, put it on the weighing scale using a measuring bucket, and gradually pour the water from the product into the measuring bucket, and finally get the total water storage. The minimum content should meet the relevant capacity standards of the country or country of use, or the minimum allowable capacity requirements confirmed by the customer.

3. Inspection standards and inspection methods for hidden structural parameters

Quality inspection of slush layer

Use the light method to check the quality of the inner slush layer. The surface of the slush layer should be milky white, and there should be no burnt black, scars, cracks, whitening, puncture points, and debris in the slush layer. qualified.

Use light reflection perspective inspection or thickness gauge to check the thickness of the slush layer. The light reflection perspective inspection of the surface of the slush layer should show a uniform milky white, and there should be no gray-black shadows of the perspective substrate color (indicating that the slush layer is too thin). The minimum thickness measured by the thickness gauge should be more than 1.5mm, otherwise it is unqualified.

Foam layer thickness inspection

Using the thickness probe, take a point from the appearance and insert it into the shell to contact the liner, and measure the thickness of the foamed layer in each part. The thickness of the foamed layer should meet the design requirements. Those who meet the design requirements are qualified. If the area does not meet the design requirements but the area does not exceed 10%, and the error does not exceed 2mm, it may be conceded in consideration of the actual situation, otherwise it is unqualified.

Foam layer density test

Take a piece of 50X50X40 foam from both ends and the middle of the product, cut off the outer skin layer, and measure the density of the sample to calculate the average density. The average density should meet the designed density requirement, and the lowest density sample density must meet the minimum density requirement. Otherwise it is disqualified. The normal density requirement is 32 ~ 38KG / M3.

Tightness test

The products are connected into a system by using standard external connection accessories, and the normal work is performed under the use conditions. There must be no leakage at any connection parts, otherwise it is unqualified.

The inner tank is tested in accordance with the tightness test method, and there should be no leakage or leakage, otherwise it is unqualified.

4. Electrical safety performance inspection standards and inspection methods

4.1 Inspection of circuits and electrical components

Circuit and electrical device inspection

The electrical components are installed correctly, especially the switches, thermostats, and wiring cannot be reversed, incorrectly connected, or incorrectly connected. The installation of electrical components must be safe and reliable. Under the condition of limited pulling, pushing and pulling, the live parts of electrical components should not touch the metal parts such as the inner liner, screws, or heating parts. Cause the connection cable to be too tight.

There must be no foam, adhesive tape, screws, or metal parts spilling from the end cap.

The wiring and cable ties must be neat and reasonable. The connecting wires must not touch the sharp angles. The connecting pipes of the thermostat and temperature limiter probes must not be flattened.

Safety distance inspection of electrical components

Check that the distance between all exposed wires and terminals and metal parts should exceed the minimum distance required by safety regulations. All connecting wires and accessories should be firmly fixed. Under shaking and slight force, the distance from metal parts should still exceed the minimum safety distance. .

Ground wire safety connection check

The ground wire should be connected with standard yellow-green wires, and the connection fittings should be made of copper. The connection should be firm and reliable and should not be loose. Ground line signs, L, N and other signs must be correct, clear and durable;

Circuit connector safety test

Shake and pull the terminals and wires by hand, and the terminals, wires and screws should not loosen or fall off.

Functional check

Check whether the switch, indicator light and temperature control can work and indicate normally.

Maneuverability check

The knob must be flexible, smooth, and pointed correctly; the switches and keys are correct and reliable;

Accessories stability check

Use one hand to hold the case where the power cord enters, and hold the power cord with the other hand, and push it in and out twice. The power cord must not go in or out more than 2mm, and the power cord cannot be hung or broken. When it is pulled off, the screws holding the wire clamp must not be loose;

4.2 Ground resistance test

Ground resistance test

Insert the plug of the electric water heater into the socket of the ground resistance tester, and then clamp the ground wire clip to the water nozzle of the electric water heater or the hanger without spraying, start the ground resistance tester, and read the resistance value is not greater than 0.1 ohm (100 millimeters) (Europe) is qualified, otherwise it is disqualified.

The standard for grounding resistance is 25A 5S not more than 0.1 ohm (100 milliohms).

4.3 Withstand voltage test

Pressure test

Plug the electric water heater with a qualified grounding resistance into the socket of the withstand voltage tester, press the reset button of the leakage protection switch, adjust the switch and the thermostat to the on state, and start the withstand voltage tester without breakdown or flicker. To be qualified, breakdown, flashing, arc flash, and smoke were unqualified. The standard of withstand voltage is 1800VAC 5S without breakdown and flicker.

Note: During the pressure test, never touch the metal part of the water heater!

4.4 Leakage current test

Leakage current test

Press the reset button of the leakage protection switch of the electric water heater that has passed the withstand voltage test, adjust the switch and the thermostat to the on state, insert the plug of the electric water heater into the socket of the leakage current tester, and dial the L, N switch, read out the leakage current value in the L and N states, the leakage current per kilowatt is less than 0.75mA is qualified, otherwise it is unqualified.

The leakage current standard is 233VAC 5S leakage value <0.75mA / KW. Our company requires that the leakage current standard of each electric water heater is 233VAC 5S leakage value <0.75mA.

When testing the leakage current, check whether the switches and indicators can be lit and correct. Note: When testing the leakage current, the metal part of the water heater is live!

4.5 Power test

Power test

Insert the water heater plug that passed the leakage current test into the socket of the electrical parameter tester, turn on each switch one by one, and read out the corresponding power. The measured power is 0.9 ~ 1.05 times the rated power is qualified, otherwise it is unqualified.

4.6 Functional test

Heating test

Use heating according to the normal use state, check whether the temperature controller is normal, whether the switch is normal, whether the indicator light is normal, whether the inner tank water is normal heating, short the temperature controller, and check whether the temperature limiter can work normally. Everything is normal, otherwise it is unqualified.

5. Other inspection items

Stress safety test

Use an external air source to pressurize the tank filled with water to the take-off pressure of the safety valve, and check whether the safety valve takes off normally. When the pressure of the inner tank reaches the rated pressure of the safety valve, the normal pressure of the safety valve is qualified and abnormal. Failed.

Inject the liner into 90% water, then immerse the liner into the pool, increase the liner pressure to twice the use pressure, stabilize the pressure for 10 minutes, and observe whether the liner has changed. After the pressure was released from the liner, the shape was qualified if it did not change, and the shape appeared deformed and distorted, and even failed.

Liner fatigue test

Connect the bladder to the fatigue tester, and perform the pressure and pressure fatigue test. The frequency setting and frequency are performed according to the relevant product technical requirements. After the fatigue test is completed, the bladder is qualified if there is no obvious deformation and leakage. After the fatigue test is completed, In the case, obvious deformation and leakage of the inner liner were unacceptable.

Thermal insulation test

Warm the water in the product to the set temperature, turn off the heating power, place it naturally for 24 hours in a standard environment, measure the temperature to reduce the temperature difference, calculate the insulation performance parameters, and meet the relevant requirements of the country and the country of use as qualified, otherwise it is unqualified .

Thermal yield detection

The product is warmed up to the set maximum temperature. After reaching the temperature, it stays stable for 10 minutes. Measure the temperature of the water and then close the water inlet valve. Pour the hot water in the machine into the insulation bucket and mix it uniformly. Measure the temperature after mixing. And the temperature after mixing, calculate the heating rate of the liner water.

The product is heated from the set temperature to the set maximum temperature. After reaching the temperature, it stays stable for 10 minutes. Turn off the power, use a 45-degree thermostatic valve to drain water into the measuring barrel, and keep it until the outlet temperature is lower than 42 degrees. The amount of water and product content were used to calculate the thermal yield.

Suspension strength test

Fill the product with water and hang it on the suspension test wall, and then use the weighting block to double the weight of the product and suspend it for 4 hours. Check whether there is deformation in the hanger and the shell. Damage is qualified, otherwise it is unqualified.

Freezer test

Put the product in a -30 degree freezer, store it for 12 hours, take it out to restore the temperature at ambient temperature, and check whether the shell is deformed or broken. If there is no obvious deformation and crack, it is qualified, otherwise it is unqualified. Then test whether the product can still work normally, it can work normally and the electrical performance test is qualified, otherwise it is unqualified.

Water Flosser Quality Control Inspection Service

Some common factors for Water flosser quality control:

Appearance

Quantity check

Measurement(weight & size)

Assembly test

Waterproof test

Leaks water test

Water jet impact test

Noise test

Hi-Pot test

Charging test

Open/close function check

Power test

2 minutes automatic shutdown test

Water tank volume test

Basic function check

Barcode scan

3M tape test for Logo

Bracelet quality control service

Some common factors for Bracelet quality control:
1.Appearance:the surface of the product shouldn’t have visible defects
2.Quantity check
3.Measurement Product specification
4.Packing check & carton drop test
5.Marking & labels check
6.Color fastness test
7.Pull test
8 Tied knot Check
9.Barcode Scan test
10.Smell test

KN95 mask, N95 mask, surgical mask, surgical mask FFP2 etc. What is the difference

On market, there are so many kinds of masks, how do we distinguish them and how to choose?

There are two main categories: one is medical masks, one is civilian masks. Medical surgical mask, medical protective mask, N95, FFP2 can be used for protection in medical institutions, KN95 can not be used in medical institutions,? the general public can choose by themselves.What are the differences?

1. Medical: disposable surgical mask (medical nursing mask)

Disposable surgical masks, medical care, general standards: YY0969, usually cannot guarantee the filterability of pathogenic microorganisms, dust. It is? commonly used in conventional nursing care in the hospital, main effect is barrier between medical staff and patients daily cross contamination, no particular high demand. If used by the general public, that is to stop bad breath, the actual effect of protection is not very ideal.

KN95 mask, N95 mask, surgical mask, surgical mask FFP2, etc. What is the difference

2. Medical: medical surgical mask: yy0469-2011

Medical surgical mask must refer to the medical standard yy0469-2011 for production. If the enterprise sets its own enterprise standard to meet or even higher than the requirements of YY0469, it can also be printed on the mask packaging (therefore, it is not necessary to have YY0469 to be qualified, specific or to see the name of the mask and enterprise standard to identify); Surgical masks are mainly used for invasive operations such as surgery and catheterization in hospitals.

YY0469 has bacteria filtration performance requirements to the surgical masks, general filtration efficiency of non oily grains should reach more than 30%, filtering efficiency to achieve more than 95% of bacteria (note, here is not the meaning of N95, don’t be confused with medical respirator), in addition, medical surgical masks have requirement for synthetic blood penetrating (can be as simple as anti permeability) in production. The masks are generally divided into three layers: the internal water absorbing layer, middle filter layer, waterproof layer outside, each layer has a special role.

3. Medical: medical protective mask

Medical protective mask, next is disposable medical nursing mask, also known as medical protective mask, in line with gb19083-2003 standard, the important technical indicators include non-oily particle filtration efficiency and airflow resistance. For diameter (0.24 ± 0.06), the filtration efficiency of sodium oxide aerosol of m is not less than 95%, that is, N95 and above. Inspiratory resistance should not exceed 343.2 pa.

4. Civil use: KN mask: gb2626-2006/2019

KN95 mask, N95 mask, surgical mask, surgical mask FFP2, etc. What is the difference

Kn represents non oil particles, and KP represents oil and non oil particles. Kn is a respirator for the prevention of non oil particles (dust, smoke, microorganism: virus, pathogen) specified in Chinese standard gb2626-2006. In the national standard, the protection level is divided into Kn90, kn95 and kn100, kp90, kp95 and kp100. Kn refers to the prevention of non oil particles, and KP refers to the prevention of oil particles + non oil particles. The latter value represents the protection rate for ultrafine particles. Kn100 respirator and kp100 respirator are more than 99.97% for the protection efficiency of ultrafine particles. Therefore, kp100 mask and kn100 mask with higher protection level in the national standard can provide better protection effect than N95 mask.

See here, don’t know if you have found a problem, just the front, have to tell everyone about medical surgical masks (YY0469-2011) for non-oily filterability of particulate matter for 30% or more, the less than 95% or higher requirement in KN95 mask a lot, so a lot of people naturally think that KN type mask, especially the type KN95 masks, definitely better than the effect of medical surgical masks! Is that absolute?

Surgical masks have impermeable requirements, generally divided into three layers, the outermost layer for the waterproof layer, the most important reason to use masks in the medical environment is to isolate bacteria, and bacteria once attached to the surface of the mask, it is very easy to follow the moist mask directly into the mask, so, impermeable is very important!

And throughout the whole GB2626, there is no standard requirements for KN mask waterproof, not only KN mask, KP mask is not, that is to say, meet all the standards of GB2626 qualified masks, there is no anti-penetration requirements. At this point, KN masks are not as good as surgical masks!

FAQ 1: Is a breathing valve good or bad?

KN95 mask, N95 mask, surgical mask, surgical mask FFP2, etc. What is the difference

Because of wearing a mask of doctors and patients, all can’t promise you must be healthy, don’t (incubation period with infectious) with the virus, and masks airflow with exhalation valve is a one-way only protection, is not good to cut off the route of transmission, from the outbreak control perspective, the two-way protection is the right way, so don’t recommend this type of face mask.

FAQ 2: About the safety mask standard: gb19083-2010 and GB2626 which is good?

Misunderstanding: China’s GB19083 standard does not have “N95”, but the use of “level 1”, “level 2” and “level 3” to express the filter efficiency level, generally level 1 can meet the “N95/KN95” requirements. That is to say, as long as any “medical respirator” that conforms to GB19083 standard, the filtration efficiency of N95 and KN95 has been achieved absolutely.

Difference: GB19083 is the highest standard of medical execution, this is the standard of medical execution, this kind of mask you will find that there is no breathing valve, and are used in the medical scene, of course, if you buy it can also be outside civilian use.

GB2626 is usually used for civilian masks, mainly used as some protection such as painting, welding, industrial and haze and other non-medical scenarios of protection, such as the most common 3M brand KN95 masks is this type!

In addition, like the medical surgical mask of yy0469-2011, GB19083 also puts forward the requirements of “synthetic blood penetration”, and there is also a parameter requirement of “surface wetting resistance”, which makes clear the protective effect of the medical protective mask on blood and fluid, which is not in GB2626 (KN type). See the difference? There is no anti – flying liquid spillage for civil use.

What is the EN14683 test for masks

What is the EN14683 test for masks

EN 14683

This standard is intended to help facilitate the choice of surgical face masks in the European Market by standardizing the information and performance data required for the masks.

There are three test methods used to classify surgical masks:

1.Bacterial Filtration Efficiency in vitro (BFE) (ASTM F2101-07)

Test is used to determine the amount of infective agent that is retained by the surgical facemask, which is directly related to the amount of bacteria released through the mask into the air of the surgical theatre.

To test, a controlled flow of air containing an aerosol with a controlled concentration of Staphylococcus aureas is driven through a sample of the surgical mask containing all layers. The average size of the aerosol droplets is around 3.0 Micron. The number of bacteria that passes the sample is compared to the number that passes without the mask sample.

A higher BFE percentage indicates a better protection level for the patient against infective agents from the OR staff.

Classification:

BFE => 95% TYPE I

BFE => 98% TYPE II

A different BFE test called the “Modified Green & Vesley” or BFE in vivo has been used frequently in the past. This test method always provides extremely high values, but does not really differentiate between different quality surgical facemasks. The BFE in vivo test method is therefore not part of the new EU standard.

2.Breathing Resistance (Delta P)

Test is used to determine the resistance airflow of the facemask.

To test, a controlled flow of air is driven through a sample of the surgical mask containing all layers. The pressure before and after the sample is measured; the difference in pressure is divided by the surface (in cm2) of the sample.

A lower breathing resistance indicates a better comfort level for the user. It means the mask feels cooler and easier to breath through, and that the mask will maintain its shape in a better way as there is less pressure on the material. There will be less unfiltered air escaping around the mask.

Classification:

TYPE I & II (non splash resistant) = < 3.0 mmH2O/cm2

TYPE IR & IIR (splash resistant) = < 5.0 mmH2O/cm2

The breathing resistance is always measured per square centimeter of material. One way to increase comfort is to have a low breathing resistance value per cm2, the other to enlarge the surface of the facemask and thereby the total area available for ventilation.

3.Splash Resistance (ASTM F1862-07)

Test is used to determine the resistance penetration of potentially contaminated fluid splashes.

To test, a precisely determined quantity of specially prepared artificial blood is sprayed at a controlled pressure against a sample of the mask. Frequently these tests are done at pressures of 80, 120 and 160 mmHg. A visible inspection on the backside of the sample indicates if there is a fluid strike-through (red color) or not. The test is repeated 32 times at each pressure, and if three or less masks show a strike through, the product is considered splash resistant at that pressure.

A higher splash resistance means the mask will protect the user in a better way against splashes of potentially contaminated fluid during a surgical procedure.

Classification:

TYPE I & TYPE II not applicable

TYPE IR & TYPE IIR minimum 120 mmHg

120 mmHg is a minimum value. It corresponds to the average systolic arterial blood pressure, and intends to protect against ruptures in small arteries causing small sprays of blood. Some products off protection even in excess of the 120 mmHg.

Minimum Performance Requirements According to the New Facemask Standard EN14683

EU Standard Class

Bacterial Filtration Efficiency

Breathing Resistance (mmH2O/cm2)

Splash Resistance (mmHg)

I 95% < 3.0 NA

IR 95% < 5.0 120

II 98% < 3.0 NA

IIR 98% < 5.0 120

Why electronic products need high temperature aging test

Why electronic products need high temperature aging

Main functions: In order to achieve a satisfactory pass rate, almost all products must be aged before leaving the factory. How can manufacturers increase their efficiency without reducing aging time? This article introduces a new approach to functional testing during the aging process to reduce and shorten the cost and time issues associated with the aging process.

In the semiconductor industry, there have been various debates about the aging of devices. Like other products, semiconductors may fail at any time due to various reasons. Aging is to allow defects to appear in a short period of time by overloading the semiconductor to avoid failures early in use. Without aging, many semiconductor products will cause many problems in use due to the complexity of devices and manufacturing processes.

Defects that appear within hours to days after use (depending on the maturity of the manufacturing process and the overall structure of the device) are called early failures. After aging, the device basically requires 100% elimination of failures caused by this time.. The only way to accurately determine the aging time is to refer to previously collected aging failures and failure analysis statistics, and most manufacturers want to reduce or eliminate aging.
The aging process must ensure that the factory’s products meet user requirements for reliability. In addition, it must be able to provide engineering data to improve device performance.

Generally speaking, the aging process uses rigorous tests on semiconductor devices in both the working environment and electrical performance to make faults appear early. Major faults occur at the beginning and the last tenth of the device’s life cycle. Aging is to speed up the operation of the device in the first 10% of its life, forcing early failures to occur in a shorter time, usually hours rather than months or years.

Why electronic products need high temperature aging

Not all semiconductors are classified according to the customer’s product needs:

For example: for drug storage, the name may be called a constant temperature room. For electronic products, automobile meters, energy meters, LCD monitors, industrial meters, mobile phones, etc., the name of the power-on aging screening may be called high-temperature aging room or high-temperature aging screening room. Do inverters, electronic equipment, computer hosts, refrigerators, washing machines, air conditioners, printers, water dispensers, tires, etc. The name may be called high temperature aging test room or aging room.

The outer frame structure of this equipment is composed of double-sided color steel thermal insulation board. The size is customized according to customer requirements and configured according to different requirements. The aging room is mainly composed of a cabinet, a control system, a wind circulation system, a heating system, a time control system, and a test load. Through the aging test, defective products or defective parts can be detected, which provides effective means for customers to quickly find and solve problems, which fully improves customer production efficiency and product quality.

As the performance and environment of the aging room must ensure the required temperature, power quality, load capacity, working hours, and the safety and habits of the operator, a set of qualified aging equipment should be a safe, reliable, and efficient Energy-efficient, fully functional and scalable equipment.

Ladies backpack inspection standard

Ladies backpack check points

1. Check whether the attachment is missing

2. Check whether the belt is firmly sewed

3. Check whether the fabric is damaged or drawn

4. Check whether the fabric has chromatic aberration

5. Check whether the clasp/zipper is easy to use

6. Check whether the tubular trim is too short

7. Check whether the stitch spacing is too close/too thin

8. Check whether the seam is neat

9. Check whether the Logo printing is good

10. Check whether the hem stitches are good

Ladies backpack test

1. Zipper fluent test: during the test, pull the zipper by hand to see whether the zipper is smooth in the process of pulling. Unzip the zipper and then pull it up.

2. Snap reliability test: during the test, use hand rebate to check whether the function of Snap is applicable.

3. (3 M coating adhered test) , where there is printed with 3 m tape tear at ten times back and forth, whether the printing is off.

4. Measurement: according to the size given by the customer, check whether the product size data meets the customer’s requirements.

5. Mildew and odor test: check whether the product has mildew and smell whether the product has pungent odor