Injection Molding

Non stick coatings for injection molding Parts?

Yes! Just recognize the difference between ‘lubrication’ and ‘release’ and you need never fail again.

Today, there are a number of hard coatings for you, the mold maker, to choose. Many are conformal in nature and replicate surface geometry and finish. Many, too, resist thermal oxidation and can wear well. But what about release? You know, actual non-stick properties, like an egg cooked in a fry pan?

The answer for injection molding is not lubrication. And here is why.

Lubrication is defined as a means to reduce friction or wear. That is true. But it is meant to be a substance between two bodies in relative motion, a load bearing interface between two solid, cohesive surfaces. And that is not what you find when you heat the mold surface above your material glass transition temperature (Tg). Which is why hard coatings designed exclusively for lubrication fail.

Depending on the compounds you are molding, ‘sticking’ failures can manifest in a number of ways: skinning, loss of polymer mobility, lower gloss and surface roughness. Hard coatings ‘with lubrication’ can negatively affect heating and cooling which, alone, can alter depth and visibility of weld lines.

On the other hand, hard coatings for non stick can make significant improvements to finish. Surface flaws can be eliminated. And that means no more painting. Structural imperfections, too, like molded in stresses, which lead to warping or distortion, can be a thing of the past.

Unfortunately, Plastic mold makers who have had negative coating experiences are reluctant to re-consider. No different than those currently experiencing satisfactory but marginal performance. Why change, they say. Especially when you believe you have tried or know about all the coatings available, today, like plating, Teflon or PTFE, PVD or PACVD.

So, where is your answer? Just ask around. You will not have to look far. The answer, you will discover, is with those who understand surface forces, the characterization of adhesion, non stick coatings for injection molding parts.

Want more information? Need help with your surface engineering?

William Gunnar, a degreed scientist, researcher, engineer, and friend, has helped thousands of ‘best of class’ product designers and equipment manufacturers — for nearly 20 years now — surface engineer with coatings for success.

His publication, brings wisdom, honesty, leading edge information, and no nonsense advice to thousands weekly. Put together by some of the world’s leading experts in coatings and manufacturing, his FREE newsletters are truly must-reads for those who want to be ‘in-the-know’.

Custom Injection Molding

Custom Injection Molding

If  your business needs plastic molding products with specific types and dimensions, then you should turn to custom injection molding companies. These manufacturers have the ability to make plastic parts for specific applications – they can customize virtually all plastic components per your requirements. They can stamp your logo or messages, produce unique colors and designs and package them specifically based on what you want and need.

Choosing a custom injection molding company

Most of the custom injection molding companies can produce any plastic product you specify, but not all of them go the extra mile to take care of ‘finishing services’ such as decorating, assembly, labeling and packaging. Some even have a design group that can assist clients with plastic part and mold design. From rapid prototyping and tooling to injection molding, ultrasonic and plastic welding and stamping, these companies can assist you every step of the way. Go for manufacturers that offer these added perks – you will end up saving time, money and effort.

Note that some custom injection molding companies do not do these extras in-house – they hire sub-assemblers and finishers, but are still able to produce products at par with your standards.

Also examine the manufacturing company’s logistics and scheduling system. They should be able to handle your delivery needs no matter how demanding they may be. You should also go for companies that implement strict controls to monitor the whole custom injection molding process. They should have the latest inspection equipment at hand to allow them to match the closest tolerance and thus provide quality consistently.

The custom injection molding company’s plant climate is also very important. They should have facilities that ensure mold cooling system control. You may contact any companies in the internet directory for your custom injection molding needs. injection Molding provides detailed information on Plastic Molds, Injection Molding, Plastic Injection Molding, Injection Molding Machines, Custom Injection Molding and more.

What Is Plastic Molding

What Is Plastic Molding

Plastics are synthetically produced non-metallic compounds. It can be molded into various forms and hardened for commercial use. Plastic molding products can be seen everywhere. Examples are jars, protective caps, plastic tubes, grips, toys, bottles, cases, accessories, kitchen utensils and a lot more.

Even the keyboard and the mouse that you use are made through plastic molding. Even the plastic parts of the chair that you are sitting on are created this way.

The basic idea in plastic molding is inserting molten liquid plastic into a ready shaped mold, for example the mold of a bottle. It will be then allowed to cool, then the mold will be removed to reveal the plastic bottle.

Plastic moulding can also custom-mold a wide variety of plastic products including: garden pots, cabinets, office trays and boxes, barriers, barricades and traffic signage and displays for product and marketing promotions.

If you are planning to go into plastic molding business, you should first know the different processes.  Choose from a plastic molding process that fits your budget, your expertise, and your resources. Here are basic definitions of various methods of plastic molding.

The Plastic Molding Processes:

1.      Injection Molding

In Injection Molding, melted plastic is forced into a mold cavity. Once cooled, the mold can be removed. This plastic molding process is commonly used in mass-production or prototyping of a product. Injection molding machines were made in the 1930’s. These can be used to mass produce toys, kitchen utensils, bottle caps, and cell phone stands to name a few.

2.      Blow Molding

Blow molding is like injection molding except that hot liquid plastic pours out of a barrel vertically in a molten tube. The mold closes on it and forces it outward to conform to the inside shape of the mold. When it is cooled, the hollow part is formed. Examples of blow molding products are bottles, tubes and containers.

Equipments needed in setting-up a blow molding business are relatively higher than injection molding.

3.      Compression Molding

In this type of plastic molds, a slug of hard plastic is pressed between two heated mold halves. Compression molding usually uses vertical presses instead of the horizontal presses used for injection and blow molding. The parts formed are then air-cooled. Prices of equipment used for compression molding are moderate.

4.      Film Insert Molding

This plastic molding technique imbeds an image beneath the surface of a molded part. A material like film or fabric is inserted into a mold. Plastic is then injected.

5.      Gas Assist Molding

Also called gas injection molding is used to create plastic parts with hollow interiors. Partial shot of plastic is then followed by high-pressure gas to fill the mold cavity with plastic.

6.      Rotational Molding

Hollow molds packed with powdered plastic are secured to pipe-like spokes that extend from a central hub. The molds rotate on separate axes at once. The hub swings the whole mold to a closed furnace room causing the powder to melt and stick to the insides of the tools. As the molds turn slowly, the tools move into a cooling room. Here, sprayed water causes the plastic to harden into a hollow part. In this type of plastic molds tooling costs are low and piece prices are high. Cycle time takes about 40-45 minutes.

7.      Structural Foam Molding

Structural foam molding is a process of plastic molding usually used for parts that require thicker walls than standard injection molding. Inserting a small amount of nitrogen or chemical blow agent into the plastic material makes the walls thicker. Foaming happens as the melted plastic material enters the mold cavity. A thin plastic skin forms and solidifies in the mold wall. This type of plastic molding can be used with any thermoplastic that can be injection molded.

8.      Thermoforming

In this plastic molding process, sheets of pre-extruded rigid plastics are horizontally heated and sucked down into hollow one-piece tools. When the hot plastic solidifies, its shape conforms to that of the mold.

Tooling costs are usually low and piece prices vary on the machinery.

Plastic molding is a very technical process. It needs experts in this type of manufacturing business for it to be competitive in the market. Therefore, a very scientific and systematic study should be first made before going into this endeavor, if you want to know more about us, please go to our mean website to know more.