Injection mold material selection requirements

ABS \ PC \ AS \ PS etc. are china injection mold material selection objects, many users are very urgent injection mold reasonably want to know the selection criteria, the appropriate materials to create the ideal injection mold products.

Injection mold material selection criteria, as follows:

1. High corrosion resistance many resins and additives have a corrosive effect on the cavity surface, which makes the cavity surface corrosion of metal corrosion, peeling, surface conditions deteriorate, plastic parts quality deteriorates. Therefore, the best use of corrosion resistant steel, or cavity surface chrome, nickel cymbals.

2. When the gloss and precision injection mold plastic parts, good wear resistance and abrasion resistance of the surface of the mold cavity are directly related to the surface, especially in some plastics joined the fiberglass, mineral fillers and some paint, they Gao plastic melt together and flow velocity in the flow channel, the mold cavity, the cavity surface friction of the great, if the material does not wear, will soon wear, damage the quality of the plastic parts.

3. Good dimensional stability during the injection molding, injection mold cavity temperature should reach 300 ℃. For this reason, the best selection of properly tempered tool steel. Otherwise it will cause changes in the microstructure of the material, resulting in changes in the size of the plastic mold.

4. The ease of processing mold parts are mostly made of metal, and some very complex structure and shape, in order to shorten the production cycle, improve efficiency, ease of processing the material requirements of injection molds and precision drawing into the shape required.

5. Good polishing performance injection molded plastic parts are usually required to have good gloss and surface state, thus requiring cavity surface roughness is very small, so that the surface of the cavity surface must be processed, such as polishing, grinding. Therefore, the choice of steel should not contain coarse impurities and pores, etc.

6. Affected by heat treatment in order to extract a small Gao hardness and wear resistance, generally injection mold subjected to heat treatment, but this deal should make changes in small sizes. Thus, preferred to use a pre-hardened steel cutting.

Study predicts sharp increase in bioplastics production, leading by Asia

European Bioplastics’ annual market data predicts that, the bioplastic plastic mould production will greatly increase in four years, reach 6.7 million tons in 2018. The data was announced on the 9th European Bioplastics Conference in Brussels, the prediction is basing on the 2013 output 1.6million tons. The study was compiled in cooperation with scientific partners the Institute for Bioplastics and Biocomposites in Hannover, Germany and the Nova-Institute in Hürth.

Biobased, non-biodegradable plastics, such as biobased polyethylene and biobased PET, is appearing the biggest increase, and local produced renewable and compostable plastics are more likely to be benefit by the new European union   directive on the reduction of shopping bags.

European Bioplastics chairman François de Bie said: “Flexible and rigid package remains by far the leading application field for bioplastics.”

"Besides this, a decisive growth can be observed in textiles and automotive injection mold applications. From functional sports garments with enhanced breathability to fuel lines — bioplastics are constantly spreading into new markets.”

The study found that Asia will expand its role as major production hub. Most of the currently planned projects are being implemented in Thailand, India and China.

"We urge the EU legislators to consider and make efficient use of the immense environmental, economic growth and job creation potential of our industry. In this context, the Circular Economy Package should remain in the Commission’s 2015 Work Program and the Waste Target Review should proceed as planned,” de Bie added.

A successful project for industrial equipment handle grip over molding tool

This is 2 sets of over molding tool WIT MOLD built for industrial equipment mold  handle grip, the first shot hard material is PA-GF30 and second shot over molding material is blue TPE, part weight is totally 293g+52g, the mould size is 396*596*480mm & 346*496*420mm, the mold weight is 854kg & 600kg. The build time is 7 weeks and after the 3rd trial the customer approve the mold.

The mold applies Hasco standard. Injection scheme is cold runner sub-gate. Over molding the part with two separated mold, 1st mold create the handle body and secondly put the body into the 2nd mold to do the over molding

This is one of our successful projects we made recently, and visit blow link for more:http://www.witmold.com/references/Successful_projects/

Prodways release 9 new product on Euromold

On Nov 24th 2014, the 3D printing company Prodways—which a subsidiary of French engineering company GroupeGorgé, unreleased 9 brand-new 3D printer mould and material.

At first, Prodways release a new 3D printer brand—Promakers, there are two series in it, the L series using Liquid photosensitive resin and V series using composite material.

Prodways released nine new products in these two series to meet the diverse needs of the market, of which 8 are L Series 3D printer, 1 are V-Series models. These products are used Prodways proprietary MOVINGLight technology, which combines UVALED and mobile DLP makes printing speed boost (10 times faster than the market standard), and print out parts have unmatched resolution and accuracy.

On EuroMold, Prodways will release its latest material brand --PLASTCureMaterials. These materials are developed by Prodways with its partners. Now has 14 kinds of different china injection mold materials, a total of about 20 kinds of products, most of which is the first appearance.

WIT MOLD attent Euromold show in December

EuroMold 2014 successfully held from Nov.25-Nov.28 last month in Frankfurt,Germany. WIT MOLD attent Euromold show as the china injection mold visitor.

EuroMold is the world’s leading trade fair for tooling and mould construction, design and product development. Based on the process chain “from design to prototype to series”, it presents products and services, technologies and innovations, trends and tendencies for the markets of the future.

WIT MOLD learnt a lot by visiting this show, including some new technologies and collected some important information for our company’s future development.

After the show, we also visited some customers in Germany. Seeing some molds running in our customer’s facility. We have known more about customer’s needs and will keep continuous improvement and make the progess year by year.

The machinability and mold life of injection mold have great relationship with the steel

The machinability and plastic injection mold life of injection mold have great relationship with the steel, so the mold steel is very important, generally saying mold steel must have below characteristics.

(1) High wear resistance

In order to improve the rigidity and mechanical property, glass fiber and inorganic filler are variously filled into plastic material use to reinforce the plastic material, they are injected into the mold cavity with the melted plastic in high speed, it causing a great wear to the mold cavity, there for mold steel should have high wear resistance.

(2)High corrosion resistance

 Lots of resin additive such as fire retardant, even the plastic material itself may be corrosive. When the resin material is mixed with filler, it could intensify the damage to the cavity, there for the cavity must apply chroming or nickeling.

(3) High thermo conductive

During the molding process, good temperature control is very important to the quality of the part. Usually copper alloy have better thermo conductive than steel, but it has lower elastic modulus, hardness and wear resistance. The low thermo conductive of steel can be compensate by cooling system.

(4) Good dimension stableness

In the molding process, the cavity temperature can be up to 300℃, great temperature difference can cause thermal expansion and thus cause the unstable of the part dimension, therefor heat-treated and pre-harden steel is preferred for better dimension stableness.

(5) Polishing ability

The surface quality of the plastic part is determined by the cavity surface quality. So the polishing ability of the steel is important for injection mold. The steel must have a good polishing ability and have no defect such as pore.

The world's largest injection mold

Nothing can replace the role of plastic injection mold in the batch production, known as "the mother of industrial" Most of our articles for daily use is inseparable from the mold. Computers, telephones, fax machines, keyboards, glass and so on these plastic products is needless to say, like a car and motorcycle engine metal cover is also made of mold, a car will used more than 20000 kinds of mold.

This mold can take cover the MINI directly below, is the world's largest mold, the overall weight of 160 tons .Germany's GRAF use it to produce a huge collection and purify rainwater storage tank, the volume of a storage for 6500 litres. Through the wholechina injection molding, saves 30% of energy and 30-40% and raw materials. Due to the closed cooling water circulation, water consumption has been reduced a lot, and to provide manufacturers warranty for 25 years. GRAF has 60 patent for the tank and nominated for "the award of federal republic of Germany" and several awards, sell well in more than 60 countries.