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| Soft Indoor Playground suppliers |
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Posted by: zuoqin - 07-17-2018, 03:17 AM - Forum: Buying Leads
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OUR HISTORY
Guangzhou cowboy recreation equipment co.,ltd was established in 2003 in Cuangzhou China,over 15 years professional experience. Cowboy has been specialized in the design,production,marketing and installation of children indoor playground.
Our production factory and office building more than 75000 square meters,2000 square meter as our exhibition hall.
OFFICE
Built an office building, production plant and warehouse, elegant, rigorous, clean office environment.
OUR PRODUCT
1.Modern paradise indoor playground
2.Space island indoor playground
3.Jungle adventure indoor playground
4.Ocean world indoor playground
5.Colorful castle indoor playground
6.Snow dream indoor playground
7.Small indoor playground
8.Huge ball pool
9.Toddler area
10.Role play area
11.Accessories
12.Adult trampoline
13.Kids trampoline
PRODUCT APPLICATION
Used for Schools, kindergartens, gardens, hotels, villas,community, amusement park,restaurant , shopping malls, supermarkets ,kids club,home,play center and other indoor places .
OUR CERTIFICATION
CCC,CE,TUV,GS,EN1176,ISO9001,ISO18001,ISO14001
PRODUCTION EQUIPMENT
Machine including Injection molding machine, Blow molding machine, Rotational molding machine, crane, CO2 protection welding machine, Pipe cutting Machine, painting machine, PVC cutting machine, GD series metal band sawing machine
PRODUCT MARKET
We have customers from both domestic market and oversea market. Our main oversea market Middle East 30%; Russian 27%; Asia20%; Africa6%; Europe and the United States8%; Australia5%; other area4%
OUR SERVICE
Pre-sale: provide professional planning and design;
In sale: report production progress at any time;
After sale: provide professional engineers to install or Install video;
Maintenance service: One year warranty.Soft Indoor Playground suppliers
website:http://www.cowboysoftplay.com/
website2:http://www.playgroundcowboy.com/
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| China Water Park Equipment factory |
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Posted by: zuoqin - 07-17-2018, 03:14 AM - Forum: Buying Leads
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High speed water slide
1. High speed water slide introduction
High speed water slide, also called the " freefall water slide" , this kind of water slide tends to be straight forward drops from start to the end, to give a feeling of maximum vertical drop to the riders. With our speed water slide, riders can experience the highest ride speed from the tallest towers. As a result, these water slides are definitely the most exciting rides, and are also some of the most dramatic slides due to the height. This water slide is usually the highest slides of the water park and therefore can be seen outside the park.
2. High speed water slide Specifications/Technical parameters
Item No. WOP14
Height 5-13m
Interior Width 0.82m
Power 7.5kw/lane
Material Fiberglass and galvanized pipe
Color Customized according to customer's requirement
Vehicle Body
3. High speed water slide application: water park, theme park, amusement park, resort, hotel, etc.
4. High speed water slide characteristics
a. High speed water slide is usually built in one or two lanes.
b. High speed water slide can be used for competition.
5. Our service :
Ø Make the whole design for customer's project according to his site;
Ø Provide professional technical training and guidance on site according to the contract;
Ø Other special technical service according to client's requirements.
6. Packages and Delivery:
Packed by plastic film and bubble wrap.
Delivery: containers come to our factory for loading.
7.FAQ
1. Are you a manufacturer, trading company or a third party?
We are a manufacturer, and we have built up our company since 2003.
2. What is the delivery time of your equipment?
In general, the delivery time of our equipment is about 30 days, customized equipment will be delivered as the negotiation with our clients.
3. Is your price competitive?
A: Only good quality equipment we supply. Surely we will give you best factory price based on superior product and service.
8. Welcome for inquiry and send us your detailed requirements for your project, we are pleased to get in contact with you. China Water Park Equipment factory
website:http://www.cowboy-play.com/water-park-equipment/
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| Industrial Paint Booth manufacturers |
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Posted by: zuoqin - 07-17-2018, 03:09 AM - Forum: Buying Leads
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Guangzhou Baoyue electromechanical equipment co., ltd located at Huadu district Guangzhou China, 15 kilometres far from the Guangzhou international airport. The factory’s area for working and manufacture is more than 13000 m2. We are specialize in the design, manufacture, sale and service for the auto spray/baking booth, industry painting equipment, high temperature drying plant.
Our company put to use the international design standard, latest manufacture technology, make and provide the high quality spray booth, other painting equipments to the auto industry, machinofacture industry and so on, all products and service sell to around the world.
Baoyue have the excellent technology team, all with rich experience, and pay attention to scientific research, innovate and the high quality, we are working on the way of corporate development, hope to create the better tomorrow with you in the future.
selling network:
Cooperative dealers:Industrial Paint Booth manufacturers
website:http://www.car-spraybooths.com/
website2:http://www.industrypaintbooth.com/
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| How does the surface of aluminium sheet extrusion blister? |
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Posted by: ZellaHyday - 07-16-2018, 07:56 AM - Forum: aluminium faq
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During the extrusion process of aluminum plate, there will be surface peeling or bubble appearing in a large capacity. What is the reason? What should be done to eliminate it? Now by the aluminum plate manufacturer for your troubleshooting!
What is bubble or peel: appear in the product surface convex bubble, common at the head, tail, complete call bubble, already broken call skin.
![[Image: 201703290853012800-300x259.jpg]](http://www.aluminiumstrip-hm.com/wp-content/uploads/2018/07/201703290853012800-300x259.jpg)
I. causes of bubbles and peeling caused by extrusion of aluminum plates
1. Excessive wear of the extrusion cylinder and the extrusion pad, improper matching of the size of the extrusion cylinder and the extrusion pad, and the diameter difference of the gasket used exceeds the allowable value;
2. The extrusion cylinder and the extrusion pad are too dirty and adhere to oil, water, graphite, etc.;
3. Water is contained in lubricating oil;
4. There are too many shovel grooves on the surface of ingot, too deep, or there are pores and sand holes on the surface of ingot, loose tissue and greasy dirt, etc.;
5. The cylinder is not cleaned when alloy is replaced;
6. The extrusion cylinder temperature and the extrusion casting ingot temperature are too high;
7. The temperature and size of ingot exceed the allowable negative deviation;
8. The ingot is too long, the filling is too fast, and the temperature of the ingot is uneven, resulting in non-drum filling, so that the exhaust in the cylinder is incomplete or improperly operated, and the exhaust process is not carried out;
9. Improper die hole design, or improper cutting of residual materials, the residual materials in the split hole and the guide hole are partially taken out, and the air in the gap enters the surface during extrusion.
![[Image: 201703290853157655-300x222.jpg]](http://www.aluminiumstrip-hm.com/wp-content/uploads/2018/07/201703290853157655-300x222.jpg)
2. Elimination of bubbles and peeling caused by aluminum extrusion
1. Reasonably designed the matching size of the extrusion cylinder and the extrusion gasket, frequently checked the tool size to ensure that it meets the requirements. If the extrusion cylinder has a large belly, it should be repaired in time, and the extrusion gasket should not be out of tolerance;
2. Keep the surfaces of tools and ingots clean, smooth and dry;
3. Clean the cylinder thoroughly when replacing the alloy;
4. Regularly check equipment and instruments to prevent excessive temperature and speed;
5. Strictly implement the process rules and regulations;
6. The reasonable design, manufacturing mold, diversion hole and diversion hole design into 1 ° ~ 3 ° slope;
![[Image: 3-300x300.jpg]](http://www.aluminiumstrip-hm.com/wp-content/uploads/2018/07/3-300x300.jpg)
How does the surface of aluminium sheet extrusion blister?
Strict operation, correct cutting residues and complete exhaust.
By experts to disabuse, believe that everyone in aluminum extrusion causes of bubble, peeling and eliminate method has a profound understanding of, to avoid these problems in the daily production, can reduce losses, improve the yield.
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| 6061 aluminum plate three different states and main USES |
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Posted by: ZellaHyday - 07-16-2018, 07:49 AM - Forum: aluminium faq
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6061 aluminum plate has high strength, corrosion resistance, oxidation resistance, good effect, is widely used in automated machinery parts, precision machining, automobile chassis, cake mold, etc., was liked by the majority of users, but 6061 T6 aluminum plate, F, O what is the difference between the three kinds of states, as the car chassis and cake mold what are the advantages? Now henan aluminum plate manufacturers for you to explain it in detail!
![[Image: 6061-aluminum-plate.jpg]](http://www.thick-aluminum-plate.com/images/pic/6061-aluminum-plate.jpg)
The difference between T6, F and O of 6061 aluminum plate
The main alloy elements of 6061 aluminum plate are magnesium and silicon, with moderate strength, good corrosion resistance and good oxidation effect. The 6061 aluminum plate is widely used after heat treatment, and the 6061 aluminum alloy plate is used in automatic machine parts, precision processing and various mould manufacturing.
Common state of aluminum plate 6061:
The T6 state is the most commonly used 6061 aluminum alloy, and the 6061 medium thickness plate is quenched through the medium thickness plate — medium thickness plate slice — tensile machine — aging treatment — sawing machine — polishing — packaging. The whole production cycle is about 10 days. After the solid solution heat treatment, no cold processing is required.
F state is the free processing state of 6061 aluminum alloy, which is applicable to the special products of processing hardening and heat treatment conditions during the molding process. F state short production cycle, medium thickness plate slices, sawing machine, polishing (or not polished, according to customer requirements), packaging, the whole process smooth, 3 days for shipment arrangement F state mechanical properties do not specifications, customers according to their own needs can be heat treatment processing, the F state again the state into production use. The corresponding price is also the cheapest.
O state is 6061 aluminum alloy through complete annealing to obtain the lowest strength of the processing products. Suitable for 6061 aluminum alloy sheetunder 8.0, its production process: cold rolling thickness, bent proper cleaning, full annealing, flying shear sheet (or finish the stretch bending pose) – packing warehousing and so on a series of production, production cycle after T6 state
Application of 6061 alloy aluminum plate in automobile chassis
The car chassis is the main frame of the car bottom. All the power parts of the vehicle, including the engine, axle, gearbox, differential, and suspension system, are mounted on the chassis.
The role of the chassis is supporting, installation car engine and its parts and assemblies, form the car overall modelling, and accept the power of engine, make the car produces sports, ensure the normal driving. Meanwhile, a good chassis can guarantee the safety of the driver’s life.
Now automotive lightweighting is a big trend, automotive lightweighting namely using modern design method and the effective means, or the use of new materials for optimization design of automobile products, under the premise that ensure the automobile comprehensive performance indicators, to achieve weight loss, energy conservation, emission reduction, the comprehensive index of safety.
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| How To Make A Great Black And White Print |
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Posted by: ircasodle - 07-13-2018, 08:17 AM - Forum: aluminium faq
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It may seem like magic, but the steps to making a great black and white print are simple and methodical. This article will provide a step-by-step guide to paper processing, for both Fiber and RC prints, as well as some helpful hints to guide you on your way.
Rules of Thumb
All processing times listed are for chemicals kept at about 68 ° F. This is especially important for developer and fixer. If you are using a graded paper, print contrast can be somewhat manipulated by varying your developer dilution. For the majority of developers, increasing the dilution results in lower contrast, while decreasing the dilution results in higher contrast. Do not change your developing time when changing dilutions. You should always experiment with test strips for the best results.
Note: Be advised that over-diluting beyond the manufacturer's recommendations tends to produce weaker blacks in the print.
PROCESSING PRINTS (For RC Prints)
Developing (90 seconds)
First, start your timer. Then, slide your print face up into the developer in one smooth motion, ensuring that the entire surface of the print is submersed. The print needs a constant supply of fresh developer, so agitate by gently rocking the developing tray. Some printers like to grab the print with tongs, flipping it over and over. This practice carries the risk of damaging the paper.
The important thing is to keep things moving, and to keep the print covered with developer. If the print is properly exposed, an image will appear on the face of the print after about 15 seconds. At first it will be very light, but it will grow steadily darker. Do not get excited and pull the print out when it "looks ready." Develop the print for one and 1/2 minutes, no matter what it looks like in the tray. Remember (and this is extremely important): you control the darkness or lightness of the print with the exposure time, not the development time. If your print is too dark, toss it and expose the next sheet of paper for a shorter time.
Stopping Development (30 seconds)
Ten seconds before the ninety seconds of development are up, lift the print from the developer with the developer tongs. Let it drain for 10 seconds, and then place it gently in the stop bath. Agitate the print for 20 seconds.
Fixing the Print (5 minutes)
Lift the print out with the stop bath tongs, let it drain for ten seconds, and then place it into the tray of fixer. Agitate the tray gently, in the same way you agitated while in the developer.
Fixer removes the light sensitive silver from the print, making it safe to take out into the light. It usually takes about 5 minutes in standard fixer to fully remove the residual silver. Always check your specific brand of fixer for instructions. If you are making a final print, fix for the recommended number of minutes to ensure long-term durability. If you are working with a test strip, you need only fix the print for about 30 seconds. It will not be safe for long-term storage, but it will be safe for you to briefly examine the strip in daylight.
Washing the Print (10 minutes)
Wash the print for at least 10 minutes under constantly running water. An archival print washer or a tray siphon washer are ideal, as they draw water from the bottom of the washer, where the chemicals accumulate. A regular processing tray can work too, if placed under running water. When using this method it is best to empty it several times during the wash, and shuffle the prints in the tray, to make sure the chemicals are completely removed. To prevent damage to the emulsion, RC paper should not stay wet for more than 20 minutes.
Drying the Print
Squeegee your prints to remove water from the surface. You can then hang them by clips or leave to dry on a drying rack. You can also use a print drier (make sure that it is safe for RC paper) or gently dry with a hair drier.
PROCESSING PRINTS (For Fiber-Based Prints)
When processing fiber-based paper, the basic procedure is the same. However, the time spent at each step will be different than for RC prints. In addition, you will need a Hypo Wash to help clear the fixer from your print, and it will take much longer to wash the print:
Developing:
Develop your prints for 2-3 minutes. The image will become visible much more gradually than with an RC print. Again, use a consistent development time rather than developing by inspection.
Stop Bath:
Put your print in stop bath for about 30 seconds, as you do with RC paper. Fixing: Fix your print for at least 4-5 minutes. Check the instructions for your specific fixer for the exact fix time. As with RC paper, you can fix for a shorter time if working with a test strip.
Rinse:
Rinse fiber prints under running water for about 2 minutes before processing in hypo clear.
Fixing the Print:
Lift the print out with the stop bath tongs, let it drain for ten seconds, and then place it into the tray of fixer. Agitate the tray gently, in the same way you agitated while in the developer.
Hypo Wash:
This step helps to clear fixer from the print, and reduces wash time which saves water. The duration is usually 1-2 minutes, with agitation, but check the label on your particular brand for instructions.
Fixer removes the light sensitive silver from the print, making it safe to take out into the light. It usually takes about 5 minutes in standard fixer to fully remove the residual silver. Always check your specific brand of fixer for instructions. If you are making a final print, fix for the recommended number of minutes to ensure long-term durability. If you are working with a test strip, you need only fix the print for about 30 seconds. It will not be safe for long-term storage, but it will be safe for you to briefly examine the strip in daylight.
Washing:
Washing a fiber print to archival standards is a time consuming task. The best way to do it is with an archival print washer, such as the Cachet Eco-Wash. These washers can wash several prints at the same time, they use less water than other methods, and they are more effective. If you have an archival print washer, wash your fiber print for at least 30 minutes.
If you don't have access to an archival print washer, the next best thing is a tray siphon. These are not as efficient as an archival washer, but they are better than a tray without a siphon. The siphon drains the water from the bottom of the tray, where the chemicals settle, which means the wash water is much cleaner than in a standard tray. If you have multiple prints in a tray with a siphon, you will need to shuffle them frequently during washing, to make sure that each print gets equal time at the top of the pile.
Fiber prints should not be left wet for more than four hours, to prevent damage to the emulsion.
Archival Prints:
If you want to make sure that your print will last for years to come, you should use a residual hypo testing kit, such as the one made by Photographer's Formulary. This test will tell you conclusively whether all chemicals have been successfully removed during washing, which is essential to the archival longevity of your image.
Drying the Print:
Drying a fiber print is a little bit different than drying an RC print. Fiber paper takes longer to dry, and tends to curl during the drying process. Heated print dryers do a great job of avoiding this, but if you do not have one, a blotter book or a print drying screen will work well. Here are some tips for the use of blotter books:
Be sure to squeegee your print very well.
Blotter book pages are interleaved with a vellum-like sheet. The emulsion of your print should face the interleaf.
Check your prints every few hours. If the pages seem saturated, or are threatening to stick to your print, move your prints to a different section of the blotter book.
Once dry, your fiber-based print will curl around the edges. No harm in it, and you haven't done anything wrong. It is the nature of fiber-based papers. To prevent curling, mount and mat your prints as soon as they are thoroughly dry.
Your blotter book is reusable, but not forever. Blotter books are inexpensive when compared to the time you put into your photographs. Stop using pages as they become stained or damaged, or if they start leaving marks or fibers on your prints. In some cases that can be with as few as 2 or 3 uses.
Caution: Prints must be washed completely before placing in the blotter book. Prints containing fixer will contaminate the blotter book and any prints subsequently placed in it.
Hints for use of drying screens:
Window screens work great. Buy ones with fiberglass rather than metal mesh. You can have screens custom made to fit your printing needs.
Squeegee the prints and lay them face up on the screen.
Place another screen directly over the first. This will help minimize curling. Leaving space between screens dries the prints faster, but allows more curling.
Prints will take 8-10 hours to dry on screens depending on ambient humidity and the number of prints you are drying.
Hints for use of heated print dryers:
Use the lowest time and temperature needed to dry the print.
Place the base side of the paper against the heated metal. The emulsion side of a print will stick to the metal.
Do not dry RC prints in a heated metal type dryer. They will melt. Do not dry fiber prints in a heated dryer designed for RC prints. They will disintegrate.
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| What Are Flexographic Printing Plates? |
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Posted by: ZellaHyday - 07-13-2018, 08:15 AM - Forum: aluminium faq
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Flexographic printing plates are flexible photopolymer plates, used in flexo printing to transfer ink & images to a flexible substrate, such as paper or film. The printing plates are a critical element of the flexographic printing process and the quality of the printed image is largely dependant on the quality of the flexo plates used.
The flexo process itself is well known for adapting to print onto all types of flexible substrates and the plates can be used & re-used over millions of impressions. Here, you will understand the how the plates are made and how they function. The plates are designed in relief, which means the print surface is raised where the image has been exposed.
The plate surface is the only area that comes into contact with the substrate after the ink is applied to the plate. The etched or relieved areas do not contact the ink. Originally, flexo plates were made from rubber, but are today made from photopolymer material in sheet form – which differentiates them from the fixed metallic printing plates of offset printing. The plates are flexible enough to be wrapped around cylindrical print/plate rollers.
Plate Processing
1) Traditional Method
The required image is first exposed onto a film negative, using a laser imagesetter. It is then placed directly onto the surface of the unexposed plate material and is held in place via a vacuum cover. The plate and film are then exposed to UV light in order to fix the image into the polymer material. Only the transparent areas of the negative film will allow the UV light to pass through, enabling the UV rays to alter the molecular bonding in the photopolymer material. After sufficient exposure time, the plate is then fixed to an oscillating platten and immersed into a washout tank. The washout solution can be water or solvent, depending on the type of plate material. The unexposed areas of the polymer are then washed away from the plate base, via a washout brush. The waste polymer is dissolved into the washout solution, which is then later processed for recycling / solvent reclamation.
Following the washout process, the plate is then placed in a hot air dryer, where excess water / solvent evaporates, leaving a dry plate. A post cure is then required, using both UVA & UVC lamps, after which the finished plate is ready for use.
2) Digital Plates
Most flexo plates today are exposed using direct ‘computer-to-plate’ technology (CTP). In this case, the unexposed film negative is supplied pre-laminated onto the photopolymer sheet, so that both layers can be exposed in the same piece of equipment.
A laser is directed by a computer to first expose the negative layer, after which the photopolymer is then exposed to the UVA light source. This exposure technique produces a superior quality plate, compared with the traditional method. The exposed plate is then processed, using the washout method described above.
3) Thermal Flexo Plate Processing
Whilst the exposure is a CTP process, as above - this processing method eliminates the need for water or solvent in the etching process. The unexposed areas of the photopolymer are essentially ‘melted’ and removed using a purely mechanical process, using heat treatment and a series of rotating rollers. This method is said to be more environmentally friendly than conventional plate washout processing.
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| Talk about Haomei 3005 aluminum slugs |
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Posted by: ZellaHyday - 07-13-2018, 08:05 AM - Forum: Knowledge & Technique
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As we had talked before, aluminum slugs has wide application on automotive, gas cylinders, aerosol cans, tubes, industrial packaging, electronics and other aspects. As we all know that aluminum alloy has 8 series, when it comes to 3000 series, the typical alloy is 3005, the same as aluminum alloy, [b]3005 aluminum slugs[/b] is the typical product of 3000 series aluminum slugs. 3005 aluminum slugs has the same physical characteristics and chemical characteristics with 3005 aluminum alloy.
![[Image: 14a323121LD0-1P39.jpg]](http://hmalu.biz/uploads/allimg/c170613/14a323121LD0-1P39.jpg)
Haomei aluminum produce large amount of 3005 aluminum slugs for the customers all over the world. We have 5 producing lines for rolling, casting, pressing, thanks to the high degree of modularity, each line can be configured according to specific customer requirements. We can supply aluminum slugs with various temper, specification, shape, alloy content and so on, we can sure the products of Haomei can meet all the demands of our clients. [b]3005 aluminum slugs[/b]of Haomei temper can be O-H112, the thickness is 2mm~10mm, the diameter is 11mm~60mm. If you want to know the MOQ, the price, the delivery period, please come to contact us immediately. With over 20 years experience, we can provide you high quality aluminum slugs and best service, we are looking forward to have business cooperation with you!
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| Differences between PS and CTP base plate |
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Posted by: ircasodle - 07-13-2018, 07:55 AM - Forum: Knowledge & Technique
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With the increasing maturity and the rapid development of CTP technology, as well as the declining of price, CTP technology has been more and more welcomed by the majority of printing practitioners, usage of CTP plates have the potential trend to catch up with the traditional PS plate. The overall requirements of the printing plate is very high, especially the current CTP plate is mostly used for high-grade color printing plate, to ensure the quality of the aluminium plate, the plate based apparent quality is the premise.
![[Image: thermal%20CTP.jpg]](http://www.ctp-plate.com/images/thermal%20CTP.jpg)
The characteristic of CTP technology is the quality of CTP based plate, such as the apparent quality, physical property and electrolytic performance. The aluminum plate base is widely used according to CTP plate technical requirement. The difference between CTP plates and PS plate on the apparent properties of aluminum plate base are as follows. The basic appearance requirements of the aluminum base plate is clean and smooth, no cracks, corrosion pits, air vents, scratches, broken, marks, bark, pine pattern, oil marks. The surface does not allow non metal pressing and sticking wound, transverse and horizontal skin defects. There is no slight color difference, bright lines and other issues. And the phenomenon of bulging and flounces is not allowed. While the PS plate can ignore the above problems, the main reason is the CTP device using scanning imaging, unlike the PS plate exposure use the vacuum method to make the layout and film sealing, if the flatness of the base plate is not well, it will affect the quality of laser imaging.
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| Are You Ready for Furniture Made of Aluminum Sheet |
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Posted by: ZellaHyday - 07-12-2018, 07:39 AM - Forum: aluminium faq
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With its delicate design, fine workmanship, heavy weight and long service life, traditional wooden furniture has long been taking leading position in the market. However, modern technology has developed to such a degree that manufacturers begin to replace quality wood with artificial board in such a skillful way that it’s very difficult for common consumers to tell the differences. No one wants to give a good offer for furniture of bad dissatisfying quality. What’s more, artificial wood usually contains materials harmful to human body, which makes many people flinch before buying wooden furniture. It used to be dilemma in the past, because you had no other choice, but now, a new type of furniture made of aluminum sheet, is coming into fashion.
![[Image: portoflio-09.jpg]](http://www.aluminium-sheet.com/images/portfolio/portoflio-09.jpg)
This kind of furniture, made of pure aluminum sheet, spares you from worries of formaldehyde contained in paintings of wooden furniture. It is only painted with a thin layer of protective film in physical way, containing no harmful material at all. There will be no problem like deformation because of moisture or worm damages. Metal boards do not take in water as wooden ones, and even mice with strongest teeth can not deal with the metal of strong strength. Besides, aluminum sheet furniture has longer service life than wooden furniture. After being processed, the boards reach a strength and property of exterior wall boards which can last 30 years even in outdoor environment. Besides, the furniture performs good fire-proof ability. It does not burn under the temperature of 600 degrees and not melt under 2000 degrees. In case of fire it helps to reduce loss greatly.
Aluminum sheet furniture is going to coming into your life. Are you ready? Which type of furniture do you prefer, wooden or aluminum?
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