Hi from China at SINCERE TECH.I have been using Autodesk Autocad products such as Mechanical Desktop for many years. Recently I have upgraded to the Autodesk Inventor 2019 series, and shortly thereafter to the new Inventor 2019 Tooling package. I will note some of the good and poor things i have found in the product […]
Plastic mold shrinkage varies due to many factors including, but not limited to: Plastic supplier/ material batch Mold Temperature Plastic melt temperature Injection and hold pressures Gate and runner size Part wall thickness Colorant/ Additives List of Shrink rates from various sources. You should of course, do your own sampling and make your own judgements
Mold Venting is very important on plastic injection molds. Inadequate mold venting will cause burns and inadequate part filling. Too deep vents may cause flash on the part in the area of the vent. Below is a list of common vent depths for various plastics. This is just a “jumping off” point as the requirements
Specific-Gravity Specific Gravity of Various Plastics SPECIFIC GRAVITY- The ratio of the weight of the molded piece as compared to the weight of an equal volume of water ASTM D792. Polybutylene 0.60 Polymethylpentene 0.83 Ethylene-propylene 0.86 Polypropylene 0.90-0.92 Polyethylene LDPE 0.91-0.93 LLDPE 0.91-0.94 HDPE 0.96-0.97 Polybutene 0.91-0.92 Natural rubber 0.91 Butyl rubber 0.92 Styrene-butadiene 0.93
What difference is there? Thermoplastics-thermosets! In general, 2 kinds of plastics are used in common injection molding: Thermoplastics and theromosets. Thermoset plastics are plastics in which the plastic softens once and when hardens cannot be remelted and recycle. Thermoset plastics form cross-links between the molecules that will not be broken down by re-heating. Old thermoset
Injection-Mold-Types There are many injection mold types. This site will attempt to explain the basics of some injection-mold-types here. The information may seen basic to those who are in the molding business, but I feel the layman deserves an overview before we proceed with details What is Injection Mold? An injection mold is a group
New SINCERE TECH Inc. Odd-Job-Lifter Easy to use, easy to install, easy to remove. All in all, this safety lifting device just makes an odd job easy and most important – safe. Install the SINCERE TECH Odd Job Lifter in the existing locating ring recess in your stationary mold half, screw in two 5/16-18 socket
Mini-Scrapers, just perfect for those little jobs in industry and at home. Strong enough to do the job, yet gentle enough not to scratch. Smaller than scraper from the hardware store, easy to modify for even smaller or contoured spaces, and cheap enough you don’t feel bad when you dispose of it when you are
SINCERE TECH has new acetal high quality scrapers. Made in USA of acetal and glass filled acetal, these scrapers are the answer to your problems. Our large scraper has both a 1 inch and 2 inch wide replaceable blade made of glass filled acetal held in a red and blue acetal handle. Strong enough to
The SINCERE TECH is plastic mold maker in China, they Safety Mold Lift Ring is manufactured of 4140 heat-treated parts for a 4″ and 5″ fork version. They come with an assortment of screws to fit in mold lift holes. The lift ring works by the cams self-centering and clamps to the lift truck fork
