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www.CustomMoldedPlasticParts.com Custom Molded Plastic Parts will provide a step by step process from design to final production, develop quicker to market approaches in the design stage, offer advice on manufacturability of the product & much more…
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CSIT Trading Co., Ltd Established in 2009, we are specialized in Injection molding,Die casting,CNC process,Puncher process,Electric painting,Powder coating． We are equipped with a modern fleet of machineries and provide the highest standard quality products.
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This process uses a multi-station, multi-mold machine with an injector on a horizontal hydraulic rod. The injector moves from station to station injecting separate molds, sometimes making entirely different parts. Find out more at www.mdiproducts.com

This excerpt discusses Short Shot part defects – including possible causes (including insufficient injection pressure, high material viscosity, restricted polymer flow) and remedies. These courses convey many of the concepts and theories covered within the RJG DECOUPLED MOLDING (SM) training seminars. This four part series starts with the major components of the molding process, and progresses to systematic troubleshooting. The DECOUPLED MOLDING (SM) system is an ideal processing method intended for anyone interested in optimizing an injection molding process. A. Routsis Associates – Complete Training Solutions for the Plastics Industry. Visit www.traininteractive.com for state-of-art plastics training, including interactive CD-ROM and online training.
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www.controlplastics.com – China Manufacturing & Assembly

Question by Responsible Plastics: Is anyone looking for recycled / green injection molded products?
Responsible Plastics molds green and recycled plastics and is currently looking for customers trying to kick start sustainability projects. Contact us at www.responsibleplastics.com if interested.

Best answer:

Answer by SOLHUTEC
Thanks for the post. There are a few companies that do look for this type of PE and molded tanks, carts, spill carts, bollards and safety railings. Contact http://www.graniteenvironmental.com/ they provide a lot of environmental products and may be interested. Good luck!

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Question by kelli p: what plastic can be injection molded and has the same density as pure methyl alcohol?
chemistry or engineering category.

Best answer:

Answer by acidcrap
Are you talking about vapor density or do you mean the specific gravity?

Another determining factor would the application for this plastic. Off the top of my head I can’t quote you any special types of plastics. All of my reference books are at work. But plastic isn’t all the same. Do you need a crystalline or amorphous plastic for your application? Will it be coming in contact with chemicals, heat, etc.

You might want to check out this web site.

http://www.immnet.com/

This is one of the biggest injection molding magazines for the business. They do have a forum there where they might be able to help you with your question.

Give your answer to this question below!

Unlike plastic injection, the mold cavities for injection molded foam are designed smaller than the final part size. The parts expand rather than shrink. The amount of expansion is dependant on the material softness you require. The material remains in the heated mold during the cross-linking or cooking process. The cooking time is dependant on the thickness of the part. The mold opens very quickly when the cooking is complete. The part expands and explosively self ejects from the mold cavity. The part is removed from the mold station and set to cool. Find out more at www.mdiproducts.com

Injection Molding-How Plastic is Molded

Plastic has, quite literally, become the cornerstone of our society. We make so many things from plastic that it is hard to imagine what our lives would be like if it was never invented. With so many of our everyday products being made of plastic, it is easy to understand why plastic injection molding is such a huge industry.

Approximately 30% of all plastic products are produced using an injection molding process. Of this 30%, a large amount of these products are produced by using custom injection molding technology. Six steps are involved in the injection molding process, after the prototype has been made and approved.

The first step to the injection molding process is the clamping of the mold. This clamping unit is one of three standard parts of the injection machine. They are the mold, the clamping unit and the injection unit. The clamp is what actually holds the mold while the melted plastic is being injected, the mold is held under pressure while the injected plastic is cooling.

Next is the actual injection of the melted plastic. The plastic usually begins this process as pellets that are put into a large hopper. The pellets are then fed to a cylinder; here they are heated until they become molten plastic that is easily forced into the mold. The plastic stays in the mold, where it is being clamped under pressure until it cools.

The next couple of steps consist of the dwelling phase, which is basically making sure that all of the cavities of the mold are filled with the melted plastic. After the dwelling phase, the cooling process begins and continues until the plastic becomes solid inside the form. Finally, the mold is opened and the newly formed plastic part is ejected from its mold. The part is cleaned of any extra plastic from the mold.

As with any process, there are advantages and disadvantages associated with plastic injection molding. The advantages outweigh the disadvantages for most companies; they include being able to keep up high levels of production, being able to replicate a high tolerance level in the products being produced, and lower costs for labor as the bulk of the work is done by machine. Plastic injection molding also has the added benefit of lower scrap costs because the mold is so precisely made.

However, the disadvantages can be a deal breaker for smaller companies that would like to utilize plastic injection molding as a way to produce parts. These disadvantages are, that they equipment needed is expensive, therefore, increasing operating costs.

Thankfully, for these smaller companies, there are businesses that specialize in custom plastic injection molding. They will make a mock up mold to the exact specifications, run it through the complete process and present the completed piece along with an estimate to complete the job to the customer.

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Inspection Techniques for Print Quality on Molded Plastic

The applications presented utilized tools that are developed from image processing algorithms. In the inspection of correctly inserted print templates.it has been shown for instance that two feature detection algorithms can be applied; in this case canned in the software described as feature detection tools. If the print template is inverted in any way, whether upside down or left to right, either or both tools will return a “fail” based on the prescribed dark or bright feature size required across the tools. For print quality, two methods have been described. The first is to use a template match of a good print and compare it with other parts. This was mainly used to detect smudges, smears and poorly printed characters. Provided the degree of mismatch is adequately defined, the template match can be used fairly adequately. In this particular case study, the template match could not be tested extensively because of lack of adequate samples.The second method used algorithms for reading optical characters (OCR).The printed characters on a good plastic part, which are not standard OCR fonts, were read into an OCR tool.Through software, the tool was trained to recognize these as OCR fonts with varying degrees of acceptance. Like in the case of the template match, the OCR was not tested extensively due to lack of adequate different production samples.For example casting mould,mold making,plastic injection mold etc.

A variety of such software and hardware exist in the market today. The comparison between the different software/hardware platforms is not intended to be the subject of this paper; however a comprehensive listing can be obtained from the Automated Imaging Association.20 Plastic molding processes are widely used in the manufacturing of various engineering and consumer items. The growth of the plastics sector has seen a slight decline (-5% overall) in the U.S. since 2000 due to the increasing costs of fuel and gas, the weakening of the dollar against major currencies in the world, and more so, the movement of manufacturing to Asia (especially China). This deficit has been absorbed mainly by China, Canada and Japan. Despite this, there is still a substantial proportion of manufacturing companies in the U.S., especially in the molding industry. Thus there is still a great need for improved process and quality control. This paper presents a simple approach that utilizes commercially available hardware and software for machine vision applications to automate the inspection of molded plastics. Generally, the training required for using such systems is minimal since most software packages supplied by vision systems manufacturers are user-friendly. The inspection for quality also requires very simple tools like those that have been demonstrated such as feature count and template matching.

After the molding process is over, the part is removed from the mold cavity manually, and visually inspected for quality. Despite this, process variations could cause minor blemishes or smears on the print that are not immediately visible to the operator. Figure S shows an example of such a defect with a close-up on a print revealing a small smear on the letter “d.” Two methods can be used for this inspection.The first is to use a temporal operation such as the template match described in section 2.S.The training data is obtained from a captured image of what is perceived as a very good quality print. Subsequent images can then be captured from parts as they flow along a conveyor, and each image compared with the trained data. A problem such as a smear or a missing character may cause a mismatch in the number and position of dark pixels that are in the image. Figure 6 is an illustration of the application of this tool.

Another useful tool that would he used to inspect a print is an optical character reader (OCR). Although the prints are not true optical characters, using the software, normal non-OCR font characters can be trained to correspond to a particular print image.After an image of a good print is captured, using this software, the actual character string is typed into the OCR reader. The reader is then “trained” to interpret the image data as corresponding to character string from the keyboard entry. After several trials, an acceptance level for allowing the captured image characters as ones that match the corresponding keyboard characters is determined. If any of the characters from a subsequent part contains a large smear it would not match the trained data set. Additionally, if there is a missing character on a plastic part, the string will not match the trained one. An example of this is shown in Figure . There are two limitations with this tool however. The first is that there ought to he adequate spacing hetween the characters for it to work effectively. secondly, minor smears on the prints may not easily he detected. Such limitations have heen addressed hy the use of advanced processing algorithms such as those that utilize neural-fuzzy classifiers.