The content and standard of VCM plate test project.

I'll tell you to ask for extra points if I'm satisfied.

First of all, let me tell you the concept: yield strength: is the yield limit of the metal material when the yield phenomenon occurs, that is, the stress that resists the slight plastic deformation.

For metal materials without obvious yield, the stress value that produces the residual deformation is specified as its yield limit, which is called the conditional yield limit or yield strength. External forces greater than this limit will cause the parts to fail permanently and cannot be recovered. For example, the yield limit of mild steel is 207MPa, when the external force greater than this limit acts, the parts will produce permanent deformation, less than this, the parts will return to their original appearance.

Tensile strength is the critical value of the transition from uniform plastic deformation to local concentrated plastic deformation, and it is also the maximum bearing capacity of metal under static tensile conditions. For plastic materials, it characterizes the resistance of the maximum uniform plastic deformation of the material, and the deformation of the tensile specimen is uniform before the maximum tensile stress, but after exceeding, the metal begins to neck, that is, concentrated deformation; For brittle materials with no (or small) uniform plastic deformation, it reflects the breaking resistance of the material. The symbol is RM and the unit is MPA.

The ability of a material to resist a hard object pressing into its surface locally is known as hardness. The local resistance of a solid to the invasion of external objects is an indicator of the hardness and softness of various materials.

Through these three concepts, there is no absolute relationship between the hardness and strength of materials, because there is a range of hardness and strength of materials of different specifications, and the hardness and strength range of different materials may intersect. It can only be simply said that the steel has a high hardness and relatively large strength. This is not a concept, I hope it helps.

There are three main differences between VCM laminating board and PVC laminating:

1. Appearance:

PVC laminated board.

2. Definition.

PVC laminated sheetThe specially treated PVC film is laminated on the metal sheet at high temperature.

VCM is a kind of metal color laminated steel plate with steel plate as the base material and vinyl chloride coating on the surface. That is, the printing film product is laminated to the surface of the steel plate by pasting.

3. Characteristics. PVC has unique properties: fireproof, waterproof, fire-resistant, weather-resistant and other characteristics, the surface forms a rich variety of wood grain, stone grain, brick and tile pattern, velvet pattern, leather pattern, camouflage pattern, ice pattern, sheepskin pattern, orange peel pattern, refrigerator pattern and other patterns and patterns, to achieve the effect of beautiful pattern and anti-corrosion and durability.

Generally, the VCM board is made of galvanized substrate and covered with color or pattern film, the surface of this type of plate is very smooth and flat, and the surface color effect is not achievable by PCM.

4. Application.

Uses: PVC products are excellent thermoforming materials, which can replace some stainless steel and other corrosion-resistant synthetic materials.

VCM is generally used in the panel of refrigerators, or the side panels of high-end wine cabinets, set-top box shells, etc., and the product uses have relatively high requirements for membranes.

VCM board is a coated board, PCM is a color-coated board, generally VCM board is made of galvanized substrate, covered with color or pattern film, the surface of this kind of plate is very smooth and flat, and the surface color effect is unattainable by PCM, but it is more expensive, generally used in the panel of the refrigerator, or the side plate of the high-end wine cabinet, the shell of the set-top box, etc., the product use has relatively high requirements for the requirements of the film. PCM is a color pre-painted plate, the surface is an environmentally friendly paint for household appliances, ** is cheaper than PCM, generally used in the side panel of the refrigerator, this kind of plate is not suitable for the panel of the high-end refrigerator, because the flatness of the plate is worse than VCM and the color effect is single, so it is mainly the use of the side plate.

They are all color-coated plates, and the processes in use are different. . .

1. Citations.

GB191 Pictorial Marking for Packaging, Storage and Transportation.

Test method for natural facing stone Compressive strength test method after drying, water saturation, freeze-thaw cycle GB9966 2 Test method for natural facing stone Bending strength test method GB9966 3 days hot facing stone test method Bulk density, true density, true porosity, water absorption test method.

Natural Facing Stone Test Method: Mirror Gloss Test Method.

2. Technical requirements.

The thickness of the plate is less than or equal to 15mm, the allowable range of thickness on the same plate is l 5mmt, the thickness of the plate is greater than 15mm, and the allowable range of thickness on the same plate is 3 0mm.

Hello! The common specification is: 600x600 (mm), and the plate utilization rate is the highest. Customization is required.

Difference: Usually the final process of product production and manufacturing is painting and painting, but there are also methods of pre-coating steel plates and then combining them into products. The English abbreviation of PCM is Pre-Coated Metal, which means pre-coated metal plate.

PCM paint is pre-coated on a sheet of metal, and the painted sheet metal is cut into a mold and combined into a variety of products.

Compared with the coating molding equipment, this PCM method can be said to be more efficient and higher in terms of paint savings and coating quality.

Introduction to the VCM Panel:

VCM is based on steel plate.

A metal colored laminated steel plate coated with vinyl chloride on the surface. That is, the printing film products are laminated to the surface of the steel plate by pasting.

Due to the wide variety of products used for filming, it is possible to create beautiful patterns and patterns.

Introduction to Metal Panels:

The PCM of the refrigerator is the metal panel.

Coated ordinary steel plates, ** cheaper than stainless steel.

Refrigerator panel material type:

There are three types: PCM, PVC, and PVT.

It is commonly known as baking paint, wire drawing, and glass fiber reinforced plastic.

Practical value: the most practical is the brushed panel, the paint panel is easy to change color, the FRP panel is easy to stick fingerprints, and the better refrigerator is made of stainless steel plates, of course, this cost is also the highest.

Now the refrigerator panel materials sold on the market are generally made of tempered glass, and the cost is relatively moderate.

Some use acrylic sheet imitation glass, which will be cheaper.

If the refrigerator panel is painted with ordinary steel plates, this is the cheapest. The ordinary steel plate and VCM film will make the refrigerator look more beautiful and the cost is moderate.

PCM steel plate is a type of pre-coated steel plate, and this material is also widely used.

The PCM color-coated board used in low-end refrigerators is painted on the surface of steel, which has a low cost, a single color and a dark tone.

The VCM laminated board is covered with a layer of plastic on the surface of the steel, and the film printing is used as the appearance pattern, which is mostly manifested as a pattern of repeated texture, and some can also imitate the brushed texture of stainless steel. However, the surface plastic will age and yellowish over time, and it needs more maintenance.

The stainless steel panel does not leave fingerprints, and the metal texture is more versatile, but care should be taken to avoid scratches, and it is only stainless steel.

Tempered glass is easy to clean, scratch-resistant, and has random patterns and colors, leaving enough space for designers to splash ink to create. Crystal clear glass makes better use of light reflection and makes the color more vibrant. However, the glass will leave fingerprints, which is inferior to the stainless steel panel.

Some products also make the glass panel into a mirror, which expands the sense of visual space.

The antibacterial performance test process of the surface of the plastic is relatively simple, the plate culture method is used for the test, and the process is generally in accordance with the order of bacterial pre-culture - sample preparation - inoculum preparation - sample inoculation - inoculation sample culture - bacteria on the sample, and then the number of colonies is counted after regular culture, and the final conclusion is that Feifan detection provides activated strains, so the test cycle can be shortened.

Guangzhou Industrial Microbiology Testing Center has set up a microbial germplasm resource bank in Guangdong Province, which can provide dozens of molds for mold prevention testing, and more comprehensively reflect the mold resistance performance of products. At present, the product categories of anti-mold testing include synthetic polymeric materials, wood, cardboard, leather, packaging materials, fabrics and textile products, coatings, paint films, adhesives, military equipment, instruments and their components, etc.

Sampling Standards for Testing and Sampling of Construction Engineering Materials (2012 Edition).

Sand: 1Executive Standards:

JGJ52-2006, GB inspection batch: should be stacked at the construction site of the same origin, the same specifications in batches acceptance, with 400 cubic meters or 600 tons for an acceptance batch, small tools (such as tractors) to 200m3 or 300t for an inspection batch, less than the above quantity for a batch. For those who enter the site with a small number of times and use them with the input, when the quality is relatively stable, they can be inspected in a monthly cycle of 400 cubic meters or 600 tons, and those who are insufficient are also sampled for a batch.

40kg of samples were taken from 8 different parts at a time.

Pebbles (crushed stone): 1Executive Standards:

jgj53-2006、gb/t14685-20012.Inspection batch: should be stacked at the construction site of the same origin, the same specifications in batches acceptance, with 400 cubic meters or 600 tons for an acceptance batch, less than the above quantity to a batch.

For those who enter the site with a small number of times and use them with the input, when the quality is relatively stable, they can be inspected in a monthly cycle of 400 cubic meters or 600 tons, and those who are insufficient are also sampled for a batch. 60kg of samples were taken from 16 different parts at a time.