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How to identify the quality level of the recycled plastics materials

1. The glossiness of surface is an important indicator to measure the quality level of particles of all kinds of recycled materials. Recycled materials of good quality have glabrous and smooth surface.

2. Transparency is also an important indicator to measure the quality level of particles of middle and high-grade recycled materials. Materials with the good transparency are usually of good quality.

3. The uniformity and consistency of color is an important indicator to measure the quality level of particles of colored recycled materials. For example: white, creamy white, yellow, blue, black and other colors

4. The density of particles is an important aspect to inspect the level of the regeneration process. 
Poor plasticizing and loose particles

5. To test whether the recycled particles sinking water or not can be used for inspecting the stuffing content of PP and PE.

If you want to know more about plastic material, like PMMA injectioin molding material, abs, PC, please go to our home page to take a look

As for recycled materials, different recycled materials have different applications, as there’re no uniform standards and it is also difficult to institute it. The only standard if have to say is to well meet production requirements of the users.

Injection Moulding Service

PLASTIC MOULD DESIGN

For the customer new to injection moulding, we offer complete concept-to-finished-part customer service. Bring us a sample, prototype or mock-up; a drawing, a concept; a completely finished part design or finished mold drawing: Cascade Plastics will provide the expertise you need to develop the molds for your product.

  1. If injection molding is not viable or economical for your project, we will tell you.
  2. We will verify that the mold design is appropriate for the anticipated volume, materials and variables anticipated.
  3. We will assist you in finding the right materials, colorants, fillers or foaming agents.
  4. We will produce the samples for your testing and evaluation.

For the customer experienced in plastics processing, Cascade Plastics will apply its expertise to review your design to identify any potential benefits or cost savings.

EXISTING MOULD MODIFICATION

Often, existing molds or materials need modification to meet new design or production requirements.

  1. We will sample new, more competitive materials and colorants, including reinforced specialty molding materials.
  2. Our in-house tool room can modify your existing mold at minimum of cost and down time.
  3. As your volume grows, Cascade Plastics has the large capacity machines, plus bulk material storage, to run multi-cavity, high-volume molds. We will work with you to complete a cost/benefit analysis, then design and build the molds to maximize the return on your investment.

COST REDUCTION

We work with existing & prospective customers in several ways:

  1. We put our purchasing power to work for you, finding the best prices for your molding materials, including truck load bulk storage purchases.
  2. We identify and sample alternative materials for your inspection and evaluation.
  3. Our process controls and operating efficiency assure you receive the most competitive plastic processing in the industry.
  4. Our electricity costs are among the lowest in the U.S.
  5. For high volume customers, our bulk storage and vacuum delivery systems are real cost savers.
  6. Our 24/5 operations permit us to offer customers additional scheduling options, just-in-time delivery, speedy reaction and price competitiveness.

INJECTIOIN MOULDING SERVICE

Sincere Tech Plastics maintains 25 injection moulding machines on line at all times, with oil or water heated thermalators providing process stability. We have color blending equipment for dry and liquid concentrates on site; our dryers can handle any volume or type of material. Having all that support equipment under one roof adds efficiencies and consistency to the injection molding process gives you stable, competitive pricing.

Our equipment features hydraulic, core pull, air blast or air eject part removal and special screws for faster cycling.

Our well maintained computer process controlled machines assure you the highest part-to-part consistency. Our machines have capacities to accommodate a variety of clamp pressures and shot sizes, giving us the opportunity to operate your mold in an optimally sized machine, creating ideal molding conditions for plastic material processing and lowering the cost per part.

POST MOLDING

We provide a variety of services ranging from part assembly, to post forming operations, to packaging of your finished product. By performing secondary operations at ST Plastics, we minimize your handling, transportation and floor space costs. Whenever possible, functions are handled by the machine operator in-cycle at no extra cost to our customers. We can send you completely assembled, labeled and packaged parts ready for shipment. In other cases, bulk packaged parts may be your lowest cost option.

Other ST Plastics services include injection moulding, ultrasonic welding, inserting, mechanical fastening, hot foil stamping and hinge post forming. Our role at ST Plastics is providing production solutions to all your thermoforming needs.

Procedures for control of injection pressure

The control of the injection pressure is usually divided into an injection pressure, the second injection pressure (holding pressure) or more than three times the injection pressure control. Switching time pressure if it is appropriate to prevent mold pressure is too high, to prevent overflow or lack of material are all very important. Mold making packing stage the specific volume depends on the gate closed when the melt pressure and temperature. If the holding pressure time to switch to products from the cooling phase of the same pressure and temperature, then the specific volume of products will not change. Plastic Molding at a constant temperature to determine product size is the most important parameters of the packing pressure, affecting the product dimensional tolerances of the most important variable is the holding pressure and temperature. For example: after the end of the filling, packing pressure decreased immediately, when the surface to form a certain thickness, packing pressure to rise again, thus forming a low clamping force of large thick-walled products, elimination of collapse pits and flash.

Holding pressure and the speed is usually highest when the plastic cavity filling pressure and speed of 50% to 65%, which is holding pressure lower than the injection pressure of about 0.6 ~ 0.8MPa. As the packing pressure lower than the injection pressure, holding pressure in the considerable time, the pump load is low, solid pump life is extended, while oil pump motor power consumption is also reduced.
Three pressure injection filling both the smooth parts, and weld line does not appear, depression, flash and warpage. For thin-walled parts, small pieces of long, long process of molding large parts or even the cavity mold configuration is not balanced and not too close parts of the molding as a whole.

1.4.3.3 the amount injected into the mold cavity filling process control of plastic
Regulate the use of certain measures in advance so near the end of the injection stroke, the screw end is still a small amount of residual melt (buffer capacity), according to the mold filling was further applied injection pressure (injection pressure two or three times) , add little melt. This can prevent depression or adjustment products product shrinkage.

1.4.3.4 screw back pressure and speed of the process control
High back pressure can be intense shear melt at low speeds, will also get a long plastic tube in the machine plasticizing time. Therefore the current use of more back pressure and speed of parallel programming control. For example: measurement of the whole trip in the screw first high speed, low back pressure, and then switch to a lower speed, high back pressure, and then switch to high back pressure, low speed, and finally in the low back-pressure, low speed for plastics , so that the front screw melt most of the pressure be released, reducing the rotational inertia of the screw, thereby improving the accuracy of measurement of the screw. Often result in excessive back pressure increases the degree of stain color; pre-plastic bodies in increased mechanical wear screw and barrel; pre-plastic periodic extension of decline in production efficiency; nozzle prone to drooling, regeneration feeding amount increased; even with self-locking nozzle, if the back pressure higher than the design of the spring closure pressure may also cause fatigue failure. So, back pressure must be properly adjusted.

3D CAD design for plastic injection molding

Over the years, 3D CAD systems such as SolidWorks have become more and more integrated into the design and manufacturing processes. Plastic injection molding is no exception. Industrial designers use 3D CAD to make ergonomic and aesthetic contours which would be next to impossible to communicate in 2D drawings. Modern toolmakers must use 3D models to make the mold cavities. Also, most rapid prototyping machines accept only 3D files to create parts.

Rebling Plastics has extensive experience using SolidWorks and CADKEY to design parts for plastic injection molding. While formats are constantly changing, we have successfully imported from and exported to virtually all other CAD programs, including Pro/ENGINEER, CATIA, Solid Edge, Inventor, and AutoDesk/AutoCAD. In addition, we use universal formats such as IGES, STEP, DXF, DWG, parasolid (x_t), STL, and many others.