Injection molding product warranty inspection is used to inspect the size of the black spot, what is

Cans are made into flower ornaments1Remove the top lid of the can no more than one centimeter from the bottom.

2.Cut the strips in the direction of the bottom, cut the strips evenly, each strip is about 5 mm, leave 3 4 cm from the bottom of the can upwards and do not cut it, keep it for the stuff.

The number of strips of the number of clippers is divided into a group of 5 6 strips 2If it is a can, you can remove the lid with scissors and brush it with paint according to the design pattern. Divide it into three sections, buy a hose and glue it with 502 in three sections.

Wear a small iron rod in the middle and wrap each section with waste paper, remember to bring the bottom of the bag, and it will become a small multi-layer shelf that can be rotated. Stick ceramic clay around the jar (to have a sense of staggering), insert a discarded pen in the mud and let it dry, then remove the pen and use waste paper.

Wrap the can body with mud to become a sex pen with a pen holder, cut the mouth of the can a little bigger and put a small motor, take a can to cut a spiral pulp, put a small battery to become a small airship, and install remote control. Cut the can into strips.

A few twists and nails are attached to the perimeter of the board to form a sex album. Also on an hour's clock, cut four or twelve small pieces, write the number or not, or other trinkets at home to become a sex wall clock.

Black dot card: various sizes, stain card, spot gauge are mainly used by the quality control department to determine the stain, is used to measure, compare the point, display and other parts of the mobile phone shell, display and other parts, whether the area, diameter, width, length of the scratch exceeds the benchmark.

Cause of failure Treatment The overheated part of the plastic adheres to the inner wall of the melt cylinder Thorough air injection, remove the melt cartridge to clean up, reduce the temperature of the plastic, shorten the heating time in the bright light, and strengthen the plastic drying treatment The plastic is mixed with respectful sundries, paper scraps, etc. Check the plastic, and completely air shoot Focal spots are generated when injected into the mold Reduce the pressure and speed of the injection, reduce the temperature of the plastic, strengthen the exhaust hole of the cracking mold, reduce the mold pressure as appropriate, and change the position of the overflow There is a dead angle in the melt cylinder that overheats the plastic Check the contact surface between the nozzle melt cartridges, Whether there is a gap or corrosion Simply put, check whether the injection molding machine is clean.

With a black dot card. It is a film film with dots of various diameters, straight lines of various widths, etc., which is specially used to compare the size of the black dots and the length and width of the scratches.

What are the five steps of the injection molding IPQC inspection step?

The inspection standard is first of all the appearance, such as whether the shape is consistent with the drawing, if it is a product used for the appearance, it is necessary to confirm the water lines, black spots on the surface, color, etc.; Then there is the size, which includes the key dimensions of the product, such as the length, bending, size of the hole for screwing, etc. In some cases, assembly tests must also be done, which need to be checked.

The common quality problems of plastic parts are: color difference, black spots, lack of material, shrinkage, watermark, brittleness, burr, etc. Test method: Mainly by looking with the eyes. Measuring tools for testing: generally calipers are used more.

The common quality problems of hardware are: burrs, finish, which is the appearance.

The most important thing to use is to see what product you are making, there are many commonly used calipers, and there are many other measuring tools.

Both of the above depend on what kind of product you are making.

I have been engaged in injection molding, hardware industry for more than 5 years, and all I do are export products.

1. Plastic extrusion index meter determines the flow properties of plastic particles in the processing process.

2. Plastic moisture content test and density test.

3. The plastic particles are injection molded into standard test strips, and physical properties such as tensile, impact, Vicat softening point, and surface hardness are tested.

4. Appearance inspection: the reference color of plastic particles or the color of dyed plastic particles.

5. Determination of limit samples.

For plastic particle inspection, most companies do not have relevant testing equipment.

The plastic particles can be compared according to the color of the sample, and then a specimen can be injected for tensile test, etc.

If you need to do mechanical, optical, and electrical properties, you still need to make standard specimens for testing.

Melt flow rate tester detects the melt index.

Moisture analyzer detects water content.

There are also manufacturers who test the tensile properties.

If necessary, the following tests will be done:

1.The pressing plate is checked for impurities, black spots, etc.;

2.Chromatic aberration; 3.Melt Index.

The items that can be tested for plastic particles are as follows:

1.Physical and chemical performance testing: apparent density, particle size diameter, whiteness, pH value, oil absorption, iodine absorption value, specific surface area, etc.

2.Impurity content detection: volatile, water-soluble, sieve residue, ash, heating reduction, heavy metals, particle content, moisture content, combustibles, etc.

3.Detection of hazardous substances: lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls, polybrominated diphenyl ethers, etc.

4.Aging performance testing: fatigue test, salt spray test, extension fatigue, flexural cracking, wear resistance, damp heat aging, hot air accelerated aging, heat resistance, ozone crack resistance, ultraviolet aging, etc.

5.Component analysis items: component analysis, principal component analysis, comparative analysis, unknown substance analysis, graph analysis, failure analysis, full component analysis, molecular weight analysis, qualitative and quantitative analysis, grade identification, material identification, formula reduction, etc.

Physical and chemical properties: biocompatibility, degradation performance, apparent density, light transmittance, rate haze, yellow index, whiteness, swelling ratio, water content, acid value, specific gravity, hardness, rigidity, density, resin content, water absorption, dimensional stability, etc.

Mechanical properties: impact properties, tensile properties, bending properties, electrical properties, wear resistance, friction coefficients, low temperature properties, resilience properties, tear properties, creep, three-comprehensive tests, vibration, impact, fatigue, stress relaxation, etc.

Environmental reliability: life assessment, aging test (ultraviolet, xenon lamp, carbon arc lamp, ozone), salt spray test, oil resistance and other liquid test, high and low temperature impact, high and low temperature cycle, etc.

Fire performance: fire rating, vertical combustion, horizontal combustion, smoke density, smoke toxicity, oxygen index, flame spread rate, etc.

Electrical properties: surface resistivity, volume resistivity, breakdown voltage, dielectric constant, loss tangent, etc.

If it is not impurities, it is paste, and paste is also normal, you can find two reasons: 1. Stabilizer; 2. Body temperature. The problem is solved through these two meetings, of course, impurities need to be filtered out.

Black dots and insoluble matter are called mixtures in the injection molding industry Black dots are generally the firing phenomenon caused by the temperature of the PVC material machine when no one uses it for a long time The insoluble matter may be caused by the unclean washing material when you change the high temperature material to the low temperature material Plastic Molding Machine Maintenance Skill Group 84240373 Welcome.

Too high a temperature may cause PVC to carbonize and decompose to produce black spots.

The problem of black spots should start from the raw materials, first see if there are impurities in the raw materials? Secondly, look at the operating temperature, see if the temperature is high, and the general temperature setting of the transparent tube should not exceed 180. Third, look at whether the amount of heat stabilizer in the formula is enough.

Fourth, see if the machine has been produced for a long time, and some dead corners in the barrel and screw have been carbonized. Fifth, see if the die head part is to be cleaned.

Please describe the characteristics of the insoluble matter carefully.

Your so-called inadmissible substances, the first may be bubbles, and the second may be impurities in the additives.

1. Black spot impurities. The mixing and conveying process is not clean, the production environment is poor, and the equipment is not cleaned thoroughly.

2. The temperature is too high and leads to decomposition, that is, carbide. Extruders or high mixers are poorly cooled and often overheated. Or the head filter is too fine, causing the melt pressure to be too high.

3. Improper formula or poor materials. The amount of stabilizer is wrong or the quality is poor, and even the raw material itself has impurities.

4. Improper operation, the machine was not cleaned when it was stopped.

In terms of control, we will start from these aspects. On-site management is the most critical.