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Most GLS styrenic TPEs Dynaflex and some Versaflex have fairly high mold shrinkage and cause the overmolding TPE to contract more than the substrate, which can result in warpage or cupping of the substrate part. This is especially true for long, thin parts or parts where the substrate is thinner than the overmold or if a low modulus substrate material is used. An accent groove of 0. Due to the tolerance on metal and other non-compressible inserts, it is necessary to include Belleville disc springs or high tension springs in the design to prevent flashing of minimal thickness inserts or crushing of oversized inserts.
Mechanical interlocks are used in overmolding to improve attachment to the substrate in areas subject to high stress or abrasion. A few examples of mechanical interlock designs are shown below:. Overmolding: Part Design. Transitions between wall thickness should be gradual to reduce flow problems such as back fills and gas traps.
Wall thickness in the range from 0. If the part requires the use of thick sections, they should be cored out to minimize shrinkage problems and to reduce the part weight. The use of radii 0. Deep unventable blind pockets or ribs should be avoided. Care should be taken to minimize sharp corners. An advancing core should be used when the mold opens and the elastomer should be allowed to deflect as it is ejected. This can be managed in several ways: Use a higher modulus substrate material Add stiffening ribs to the substrate part Minimize the thickness of the soft TPE Use a lower hardness for the TPE Relocate the gate to minimize the flow length to thickness ratio Shut-Off Design Shut-offs should be designed to: Reduce the potential of peeling and provide a sharp transition between the TPE and the substrate.
Provide a distinct cavity for the TPE that is capable of being vented. Prevent the TPE from flashing over areas on the substrate. Provide a 0.
Welcome to Overmould
Provide a spring-loaded area if the inserted substrate is a metal or other non-compressible material. Need help? How can we help you? Close Start Chat.Injection Molding. Overmolding is a two-shot plastic injection molding process that creates a single part by combining two separate but complimentary thermoplastic materials. The first shot, called the substrate, is usually composed of a more rigid plastic and is designed to accept the second shot, called the overmold.
The overmold is typically composed of a softer, more flexible plastic-like rubber. One of the more common reasons to use the overmolding process in injection molding is to create a soft grip. Pulling from the example used above, the green part is used functionally as a twistable nozzle that will help direct the flow of a liquid. However, in this case, the plastic chosen to facilitate the flow and to keep its chemical resistance for lasting part integrity happens to be very rigid and hard to the touch; not ideal for tightening and loosening with human hands.
The solution is to design for an overmolded rubber-like grip to aid the user in the twisting of this product. But, tactile functionality is not limited to human grip. Overmolding can also be cleverly used to add rubber-like grips to clips designed to grab inanimate objects. Here is another tactile example where a softer, rubber-like grip has been overmolded onto a rigid plastic part.
In this case, though, the rubber-like grips are overmolded in two separate areas, which is a feasible use of the overmolding process.
That is, overmolding can be utilized in more than one area of the same part to achieve even more functionality. Another fairly common use of overmolding is for purely cosmetic reasons.Can you paint over mold?
Overmolding can be used to create color contrasts for a more pleasing look and feel. The part example on the right uses a red plastic overmold onto a black substrate, creating a nice-looking part design, which can help with product branding or to differentiate functionality.
Also, overmolding can be used to hide features within the substrate. In this example, there happens to be a visible parting line in the substrate of this housing panel.
To hide it, the designer chose to overmold the perimeter of this part. Finally, by using a contrasting color, this single overmolding design serves three different functions. A third reason to use overmolding when desinging for plastic injection molding is to connect two or more substrates. In this example, a plastic button red is connected to a plastic housing green via a rubber overmold blue.
This overmolding design allows the button to move freely within the housing substrate while providing good pressure for the button. In this case, the overmold was accessed through the rear of this part and encapsulates the button in a way that allows the actuator pin to interact with the circuit board that will be assembled within. This also doubles as a seal around the button. The softer, rubber-like material also allows for more flexible actuation that cannot be found on a standard button assembly.Find a pre-screened local mold removal specialist Free Estimate.
Can you paint over mold if you use mold resistant paint? We are asked that question frequently by homeowners hoping to cover walls or other surfaces discolored by mold and also hoping to kill any lingering mold and prevent its return. We never recommend painting over mold, though, not even with anti-mold paint. That type of paint will resist the development of mold if applied to a clean, mold-free surface. However, it will not kill mold already on the surface, at least not completely.
What it will do is make it more difficult for you to see when that mold begins to grow and spread, which is sure to happen at some point, and therefore the mold problem can get much worse before you even notice that it is happening.
Instead of painting over mold, remove as much mold as possible from a surface before painting it. Use an antimicrobial cleanser we like Foster and a brush to clean the surface thoroughly.
It can be difficult or impossible to completely remove mold from porous surfaces like wood, and in those cases, professionals sometimes sand the wood to remove more mold. If you think a surface may need to be sanded in order to remove all traces of mold, call in a professional.
Most offer free consultations, so you have nothing to lose. Just take advantage of some free expert advice. Known as encapsulation, this process seals in any mold that cannot be removed, preventing it from growing and spreading. It also helps repel future mold from the surface. Before you paint over mold sealant, allow it to dry completely. Keep in mind, however, that mold remediation professionals recommend removing and replacing moldy materials whenever possible if they cannot be thoroughly cleaned; encapsulation should be a last resort.
Professionals also recommend against encapsulating large areas of mold; use this technique only sparing if you must use it at all. Use mold resistant paint in areas that are subject to lots of moisture, like bathrooms and kitchens, in damp spaces like basements, and in any areas that have previously had mold problems. You can purchase paints designed to resist mold at most home improvement stores.
Make sure surfaces are clean, free of mold, and completely dry before painting them. If you apply a mold sealant to a surface, allow the surface to dry completely before applying the sealant and then allow that to dry completely before painting it. If you need assistance with mold remediation, or need help sanding or encapsulating a moldy surface, you can schedule a free consultation with a mold remediation professional.
A highly trained, experienced professional will visit your home, assess the situation, and advise you about how to proceed at no cost to you. Follow the link to find qualified mold remediation professionals near you. Mold Prevention. Causes of Mold.Overmolding is the process of adding an additional layer of material over an already existing piece or part.
For example your product has a screw, which would be much easier for the consumer to turn if it had an added T-handle. You could try to attach a T-handle with additional screws or snap one in place, but optimally it would be nice to have the T-handle incorporated into the design of the screw.
Overmolding can do this. The screw is placed into a mold and material is attached directly, either chemically or mechanically, with no additional parts or pieces, to form the T-handle. For chemical attachment the initial part is coated with adhesives before adding the overmolding material.
For mechanical attachment, the primary piece is either scored or altered slightly with projections or recessions to better attach to the overmolding material. Ultimately, you will be left with a single part that fulfills a custom function. This process is ideal to simplify your end product design and decrease the chance of moving parts breaking.
The options that overmolding creates are endless. Overmolding can be added to change the surface of a piece or product part by adding texture, color, and incorporating necessary functionality components for the specific consumer. If you can dream it, we can make it. Overmolding physically alters the surface of a part or piece so it can be made smooth or rough depending on the material used for the overmold.
It can also be spongy for handling comfort or very strong for enhancing product durability, also varying with the material used for the overmold. The options are limited only to the imagination of the inventor. Material for overmolding is available in many variations of strength, pliability, and durability.
As well as the tactile variations overmolding provides, the options are endless for colors that can be added with overmolding. No longer is the inventor limited by a single color of metal. Overmolding allows the unlimited choice of colors available with plastics. Overmolding also allows detail to be added to products for specific consumer use. A screwdriver may have a rubberized plastic handle added to the metal core for ergonomics and consumer comfort.
The handle can be a variable thickness and have added cushion or texture for better grip. The color of the handle can be made a bright color for ease of finding by the consumer or to reflect a particular brand identity. The handle of a flashlight may be red or yellow to aid quick retrieval in an emergency situation.
Medical instruments may have overmolding to improve ease-of-use for the physician or technician. Handles on instruments may need to be thicker than the internal metal structure for proper handling, or have a specific shape on the outer handling surface for ease-of-use or for connection into another instrument.
Overmolding could also be added to smooth out corners or sharp edges of metal instruments to avoid possible accidents during use. Consumers may require that their tools have smooth or rough surfaces added to metal structures for use in outdoor environments and protection from the elements, or from the chemicals or processes in which they are exposed during regular use.
All of these issues can be addressed and incorporated with Overmolding. Overmolding can also streamline your product by reducing the necessity for rings and sealing fixtures.Painting over any mold or mildew can be done only after taking the necessary precautions and recommended steps. Ignoring the issue around your home will continue to cause you mold and mildew health problems. Try as you might to hide it with a moisture resistant paint primer it always has a way of showing its face again, especially if the source and reason are not discovered and taken care of first.
Paint itself does not and will not get rid of or kill any mold or mildew. Mold is a type of fungus consisting of tiny organisms found almost everywhere. They can appear most often as as black, gray, or brown spots, but have also been known to show up as white, orange, green, or purple spots. It thrives on moisture and spreads quickly. The spores travel through the air and are easily inhaled, causing breathing problems, headaches and fatigue to name a few.
Mildew is also a form of fungus and is related to mold. The difference between the two would be how they appear. While mold will tend to show up as a black or green large almost fuzzy type looking patch, mildew cab show up as a gray or sometimes white patch on any moist area or surface like walls. Mildew can be treated with a good cleaning solution, and elbow grease. Mold on the other hand may have to be further investigated by mold experts.
Mildew can show up in high levels of humidity such as bathrooms, kitchens or basements and can appear as black, gray, green or brown spots.
Areas in the home with high levels of humidity that are without proper or adequate fresh air circulation can eventually create mold or mildew problems. Mold can be caused by water leaks from a bathtub, toilet, sink, leaky roof or water faucet or from flood damage.
It is important to find the source of the water damage causing the mold and fixing it. Paint itself does not cause mold or mildew but the appearance of bubbling paintpeeling or cracking paint are usually signs that high levels of moisture are present and that immediate action should be taken. Taking the first step to find the source of the problem and why there is moisture is important to identify, so as to be able to seal any water leaks or repair any damaged roof to prevent the mold from happening again after you have repaired and repainted the area.
You can not just hide the mold and mildew by just painting fresh paint over it, if the issue is not fixed and resolved first the problem will continue to exist and re-occur.
Sometimes it is very obvious that mold is present from the dark spots on the walls, around the windows etc. You can identify if you have a moisture problem inside your home if you notice and of the following issues. Smell — If it smells musty and damp in the bathroom, laundry room or basement that can be the first indication that there may be a mold issue in your home.
These spots may range in colour from white green, brown, gray and the most common black.Welcome to Overmold Express! More Than 75 Years of Experience To Help You Exceed Expectations Overmold Express is an established manufacturing partner providing overmolding and encapsulation services to hundreds of domestic companies. We do more than fulfill orders, we care enough about your projects to ensure that you always find more than you need. Custom Services We Provide. Brilliant Team Our professional staff will provide consultative feedback to maximize your product outcomes.
Never hesitate to ask. Huge Selection of Materials We have one of the largest selections of materials for you to choose from. Overmolding Expertise. Overmold Express has more than 75 years of professional experience working with all overmolding technologies in multiple industries. Prototyping is often part of our design process. We can help you explore different design alternatives. Choose Any Color or material.
What is Overmolding?
We provide you with the widest variety of materials and colors available on the market today! We have a proven track record of overmolding success with hundreds of clients.
We have a dedicated team of manufacturing specialists to help you with any overmolding project. Overmold Express is an established manufacturing partner providing overmolding and encapsulation services to hundreds of domestic companies. Industry Experience More than 75 years of expertise at your disposal. Over 75 years of combined knowledge overmolding electronics.
We provide many different overmolding processes.
We know what to recommend to help you achieve optimal product outcomes. Extremely short lead times. Contact us today to find out how quickly your project can be completed. We have one of the largest selections of materials for you to choose from. Our work flow is very flexible and our staff will make the experience better every time you contact us.Our services also include 3D printing, injection moulding and rapid prototyping.
As the leading UK experts in overmoulding, who better to handle your outsourced Electronics encapsulation and overmoulding requirements?
We offer you overmoulding expertise right from product design to ensure you maximise productivity at the lowest cost for your electronic assemblies. If you have an idea for a plastic product and need an experienced, professional company to help you make it a reality, then relax, you have come to the right place.
We provide a rapid development and production service for Mould Sets for low pressure and injection moulding.
Overmolding: Part Design
From concept to completion you can rely on our experienced engineers to provide you with a first class service. Our 3D Printing service enables parts to be produced, layer by layer from 3D CAD data, in just a matter of days without the need for any tooling. Vacuum forming is a versatile, cost-effective, plastic moulding technique that can be applied to a number of different market sectors and industries. Overmould can supply prototypes to production runs in a variety of thermoplastic materials with low tooling cost and a quick turn-around time.
Laser Cutting is a simple process of cutting a direct translation of what we or our customers have drawn using CAD.
The end results however are outstanding and customers are continually impressed with the precision and quality provided. Our overmoulded electronics are used in industries such as automotive, industrial, consumer, medical, theatre, and military. With our expertise and state of the art equipment, technology and best practices, our company strives to provide total customer satisfaction.
Each product undergoes testing and quality control before packaging and shipping. Overmould Ltd provides manufacturing for a single component, as well as turnkey production, from procurement all the way to packaging and shipping to the place it will be sold.
Utilising our dedicated CEM manufacturing facilities, Overmould Ltd can deliver a full end to end PCB Assembly solution that can include wiring, potting and conformal coating and extends to final assembly operations. Overmould Ltd provides a great service and speedy turnaround.
We use resin encapsulation for most of our products, and Overmould are a key element of our supply chain. As well as the overmoulding service, they provide expert tooling manufacture and product design advice. All we could look for in a supplier! LEMO UK has worked with Overmould for a number of years and always found them ready and able for the challenges that lie ahead. Overmould is flexible to customer requirements and present many excellent ideas, they are very responsive to its customers wishes and will do everything in their power to match what the customer needs for its project, they are always on time and willing to co-operate — I wish all suppliers had the same ethic.
Thank you and keep up the excellent services! The directors of C R Encapsulation Ltd would like to thank you for the advice you have given our company on our investment in Overmoulding. Many thanks for the support Overmould Ltd have given Labone, culminating in our purchase of the Moldman machine.
It is so user friendly that within an hour of the kit arriving we had the first pieces coming into production, and none of us had any background in plastics. This equipment will increase our efficiency and also gives us greater control of what was an outsourced process.
Overmould, formerly known as Engineering Solutions, is a sub contract manufacturer specialising in the sealing and protection of electronics using low pressure injection moulding technology as well as other appropriate technologies. We work with our customers to provide complete turnkey support including: design, engineering, prototyping, assembly, overmoulding, and testing.