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Unscrew injection molding, as its name implied, there is thread in the plastic part for easy assemble and connection with other screw parts. Unscrew molding products are common in our daily life as we can see the caps form our bottle. This is kind of a very basic and normal unscrew molding products. 

Unscrew molding is a very important form of injection molding. Unscrew mold manufacturing technology is becoming more and more mature. However, many mold factories cannot really master the technical essentials. The unscrew molds have very strict requirements for the entire mold manufacturing and processing because of their assembly performance. Unscrew mold is divided into internal thread mold and external thread mold. Externally threaded molds can generally be realized by slider in the mold, but the precision is very high. Internally threaded molds generally require the cooperation of the core pulling structure.

Our company specializes in manufacturing unscrew molds. Years of industry experience have given us a deep understanding and knowledge of unscrew molds. We have made many kinds of packaging lids, pipes, connectors. If you are looking for a real unscrew mold manufacturer, please choose us.We will serve you the best, high quality unscrew mold and products. 

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As a good reputation manufacturer in China, we here share the basic injection mold making process in our company: 

1. Products design department provides product information to injection mold design department, injection mold designers complete cost analysis in two working days, and provide to R&D manager. 

2. R&D department release "Mold Making Apply" to plastic injection mold design department after confirming the project. 

3. Injection mold designers organize relevant personnel to review the project based on the product information, including product structure, mold structure, cooling system, runner, slag, venting, etc. in plastic injection molding process

4. After evaluation, injection mold designers begin to design the plastic injection mold, including 3D drawing correction, 3D parting, mold parts assembly drawing, EDM drawing, electrode drawing etc., and organize relevant personnel to evaluate those drawings, then issue to plastic injection mold making department. 

5. Injection mold makers evaluate and study the drawings, and order mold materials if there is no objection, otherwise, communicate with the plastic injection mold designers.

6. Injection mold makers inspect the mold materials in time after the materials arrive to injection mold factory china, and arrange technicians to do locksmith works, including turning, grinding, milling, screw holes, water carrying hole, center hole, CNC roughing, etc. The technicians should pay attention to the precision of each right-angle sides, avoid empty of the center hole and each production base, roughing margin etc. Then outsource each mold part to heat treatment promptly.

7. After heat processing, plastic injection mold maker must detect its hardness and metallurgical analysis. Generally, the core hardness 46-50HRC, for uniform distribution of 9 points, requiring its hardness differ is less than 2HRC. Metallurgical analysis should be done for the injection mold core prior to processing to make sure there is no segregation, scars, etc. 

8. Electrode processing, there are fine and rough processing, fine male spark is 0.05-0.08, rough male spark is 0.2-0.3 (subject to the actual situation). Be sure to pay attention to each processing benchmarks, and detect electrodes after processing finished.

9. Before finishing, must make right angle for the mold core, the vertical degree should less than 0.02 mm, finish degree 1.6.

10. For line cutting, please note that all parts' base, enlarge 0.02mm for the insert hole and center hole as tolerance clearance, for non-standard thimble, the tolerance clearance is 0.04mm of the actual thimble size. 

11. Mold core finishing, based on the benchmarks after making right-angles, typically leaves 0.02 mm die as a margin (without considering tool wearing).

12. EDM processing, process according to the drawings' size, fine 0.05-0.08, rough 0.2-0.3 (subject to the actual situation), pay attention to the benchmarks in processing, for sparks processing, the leave a margin of 0.03-0.05 mm. 

13. The runner surface must be polished to achieve Ra6 or Ra7 finishing, the surface does not allow spark or knife pattern to exist. 

14. Before assembling the plastic injection molding parts, the mold maker must do a comprehensive inspection for all related parts to make sure everything is in a good condition, and do cleaning and anti-rust treatment. Then fill "Mold Inspection Summary" form.

15. In tryout, injection mold designers, plastic mold makers and die casting workshop personnel should go to the site, making analysis and solution of abnormal in casting tryout, improving the plastic injection mold and die casting process according to the results, and fill "Mold Tryout Report".

16. By 100-150 cycle time, the tryout products are defect-free, the production department make production schedule, the technicians track the production processes, and feedback yield to the plastic injection mold making department.

17. After tryout, plastic injection mold making department apply for storage with the forms of "Mold Making Apply" and "Mold Making Inspection".

We are ready and looking forward to cooperate with your next project, Contact Us Now, you will be satisfied to choose us as your partner in plastic parts manufacturing process.

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Polyvinyl Chloride (PVC or Vinyl) is a high strength thermoplastic material widely used in applications, such as pipes, medical devices, wire and cable insulation...the list is endless. It is the world's third-most widely produced synthetic plastic polymer. 

Polyvinyl Chloride can be injection molded just like other plastics but the inclusion of chlorine in the material complicates the process. This is because melted PVC can give off a corrosive toxic gas. Accordingly, shops need to be equipped with sufficient ventilation systems. Those that aren’t are likely to be hesitant to work with the material. Additionally, special corrosive resistant materials like stainless steel or a chrome plating are required for the mold tool when injection molding PVC plastic. Shrinkage in PVC tends to be between one and two percent but can vary based on a number of factors including material durometer (hardness), gate size, holding pressure, holding time, melt temperature, mold wall thickness, mold temperature, and the percentage and type of additives.

Properties of PVC Injection Molding

General performance PVC resin is a white or light yellow powder with a relative density of 1.35-1.45. The hardness of the product can be added by PVC transparent board PVC transparent board. Adjust the number of plasticizers. Pure PVC has low water absorption and permeability.

Thermal properties: The thermal stability of PVC is very poor. It begins to decompose at 140 ° C and the melting temperature is 160 ° C. The coefficient of linear expansion of PVC is small, and it is flame retardant, and the oxidation index is as high as 45 or more.

Electrical properties: PVC is a polymer with better electrical properties, but due to its greater polarity, electrical insulation is not as good as PP and PE. Dielectric constant, dielectric loss tangent and volume resistivity are large, corona resistance is not good, generally suitable for low-voltage and low-frequency insulating materials.

PVC Injection Molding Requirement

Injection Molding Condition Value Unit for reference

Drying Temperature 60-90 °C

Drying Time 4.0-6.0 hr

Suggested Moisture Content <=0.30 %

Rear Barrel Temperature 160-180 °C

Middle Barrel Temperature 170-190 °C

Front Barrel Temperature 180-200 °C

Nozzle Temperature 180-200 °C

Mold Temperature 40-60 °C

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Prototype samples of plastic injection molding products are basic working samples, mockups, models, or just simulations of actual products, and other forms (final products and variants) are developed on this basis.

The main motivation for prototyping is to verify the design of the actual product. Sometimes, creating prototype samples is called implementation, because this is the first step in converting a virtual or conceptual design into an actual physical form.

It is a preliminary version of the actual product developed for the following purposes:

Verify plastic mold design,

Introduce to investors or licensees

Intellectual Property Protection,

Eliminate the knots in manufacturing,

Test and improve products.

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Polypropylene, abbreviated as PP, is a colorless, odorless, non-toxic, translucent solid substance. Polypropylene (PP) is a thermoplastic synthetic resin with excellent properties. It is a colorless, translucent, thermoplastic and lightweight general-purpose plastic. With chemical resistance, heat resistance, electrical insulation, high-strength mechanical properties and good high-abrasion processing properties, etc., this has made polypropylene quickly used in machinery, automobiles, electronic appliances, construction, textile, packaging , agriculture, forestry, fishery and food industry.

In recent years, with the rapid development of China's packaging, electronics, automotive and other industries, it has greatly promoted the development of China's industry. And because of its plasticity, polypropylene materials are gradually replacing wooden products, and high strength and toughness and high wear resistance have gradually replaced the mechanical functions of metals.

Properties of PP Injection Molding

Polypropylene is a non-toxic, odorless and tasteless milky white highly crystalline polymer with a density of only 0.90- "0.91g / cm3. It is one of the lightest varieties of all plastics. It is particularly stable to water and absorbs water in water. The rate is only 0.01%, and the molecular weight is about 81.15 million. The moldability is good, but because of the large shrinkage (1% to 2.5%), thick-walled products are easy to sag, and it is difficult to meet the requirements for some parts with high dimensional accuracy , Good surface gloss.

PP Injection Molding Requirement

Drying Temperature 60-90 °C

Drying Time 2.0-6.0 hr

Suggested Moisture Content <=0.20 %

Rear Barrel Temperature 200-260 °C

Middle Barrel Temperature 210-270 °C

Front Barrel Temperature 220-280 °C

Nozzle Temperature 230-290 °C

Mold Temperature 20-90 °C

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pom injection molding, Polyacetal, also known as acetal or polyoxymethylene (POM), is a formaldehyde-based, semi-crystalline engineering thermoplastic containing the functional group of a carbon bonded to two -OR groups. Other names of POM are Polyformaldehyde, Polymethylene glycol, Polyoxymethylene glycol. It is 100% recyclable.

POM resins are widely used in the production of precision plastic molding parts for applications demanding good dimensional stability and sliding properties. Some of them include: Automotive, Electrical & electronic, Industrial, Drug Delivery ect. 

The polymer serves as an alternative to metals thanks to its low friction & wear characteristics and its excellent balance of mechanical and chemical properties.

Properties of POM Injection Molding

The tensile strength of POM reaches 70MPa, the water absorption is small, the size is stable, and the gloss is better than nylon. POM is a highly crystalline resin, which is the toughest among thermoplastic resins. With heat resistance, bending strength, fatigue resistance strength are high, wear resistance and electrical properties are excellent. POM properties: specific gravity 1.43 performance values ??m.p. 175 ° C tensile strength (yield) 70MPa Elongation (Yield) 15% (at break) 15% impact strength (no notched) 108KJ / m2 (with a notch) 7.6KJ / m2

pom injection Molding Requirement

Drying Temperature 60-80 °C

Drying Time 2.0-6.0 hr

Suggested Moisture Content <=0.20 %

Rear Barrel Temperature 170-190 °C

Middle Barrel Temperature 180-200 °C

Front Barrel Temperature 190-210 °C

Nozzle Temperature 200-220 °C

Mold Temperature 40-80 °C

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PC is classified as a ''thermoplastic'', and the name has to do with the way the plastic responds to heat. Thermoplastic materials become liquid at their melting point (155 degrees Celsius in the case of Polycarbonat). A major useful attribute about thermoplastics is that they can be heated to their melting point, cooled, and reheated again without significant degradation. Instead of burning, thermoplastics is like Polycarbonate liquefy, which allows them to be easily injection molded and then subsequently recycled.

PC is commonly used for plastic lenses in eyewear, in medical devices, automotive components, protective gear, greenhouses, Digital Disks (CDs, DVDs, and Blu-ray), and exterior lighting fixtures. 

Injection molding most often produces parts by polycarbonates and their blends. Since polycarbonate is highly viscous, it is usually processed at high temperature to reduce its viscosity. In this process, the hot polymer melt is pressed through into a mold with high pressure. The mold when cools, gives the molten polymer its desired shape and characteristics. This process is generally used to manufacture polycarbonate bottles, plates etc. Since polycarbonate is a poor-flowing plastic, wall thickness should not be too thin.

Properties of pc injection molding

Mechanical performance: high strength, fatigue resistance, dimensional stability, and small creep (also rarely changes under high temperature conditions);

Heat aging resistance: The enhanced UL temperature index reaches 120 ~ 140 ℃ (long-term outdoor aging is also very good);

Solvent resistance: no stress cracking;

Stability to water: easy to decompose under water at high temperature (use caution in high temperature and high humidity environment);

Insulation performance: excellent (moisture and high temperature can also maintain stable electrical performance, is an ideal material for manufacturing electronic and electrical parts);

Dielectric coefficient: 3.0-3.2;

Arc resistance: 120s;

Form ability: injection molding or extrusion of ordinary equipment.

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Other materials molding

Here we list some other materials for plastic injection molding parts.

PE, Polyethylene is a lightweight, durable thermoplastic with variable crystalline structure. It is one of the most widely produced plastics in the world. Polyethylene is used in applications ranging for films, tubes, plastic parts, laminates, etc. in several markets (packaging, automotive, electrical, etc.)

Polystyrene (PS) plastic is a naturally transparent thermoplastic that is available as both a typical solid plastic as well in the form of a rigid foam material. PS plastic is commonly used in a variety of consumer product applications and is also particularly useful for commercial packaging, laboratory ware, automotive, and Electronics.

General Purpose Polystyrene (GPPS) and High Impact Polystyrene (HIPS) are probably the most commonly used PS resins for injection molding. GPPS is clear, but brittle (think of a CD jewel case) while HIPS is opaque and much less brittle.

Acrylonitrile Styrene (AS) - A group of copolymers that have the transparency of polystyrene, but with improved resistance to solvents and stress cracking. AS is used in applications ranging for Electrical/Electronic Applications, Appliances, Construction Applications, Decorative Parts, Automotive Applications, Piping, Telecommunications, Industrial Applications, Non-specific Food Applications.

Thermoplastic Polyurethane or TPU is referred to as the bridge between rubbers and plastics. The material appears rubber-like, which means it can be extremely flexible, durable and smooth to the touch. All these properties and compound versatility makes TPU widely used in many industries for coatings, components and customer goods. TPU exhibits high-performance properties if processed correctly through injection molding, the important factors are mold and nozzle temperature, pressure and plasticizing energy. If the plastic injection molding process or an object's design don't suit the material, it may cause damage and shrinkage of parts.

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Nylon is commonly referred to using the chemical designation “PA” (e.g., PA 6 or PA 6/66) and is most widely available in black, white, and its natural color (off-white or beige). Perhaps the most common variant for engineering applications is Nylon 6/6. Nylon 6/6 can be extruded (melted and forced through a die) and is also a suitable plastic for both injection molding and 3D printing. It has a high melting temperature, making it an excellent substitute for metals in high-temperature environments (e.g., under the hood of a vehicle). The material’s downside is that it has relatively low-impact strength (even when compared to other plastics). Of note, the impact strength of Nylon can be improved by a process called “conditioning.” For this reason, as well as the ease with which Nylon can be combined with other materials to enhance its strength, it is important to check the material properties of the specific Nylon material you are using.

The molding cycles are quick, providing an economical interest. Polyamide 6 and Polyamide 66 answer the requirements of numerous applications in the varied markets. PA6, PA66 Replace Metal in Automotive Applications Electrical & Electronics Applications-Flame Retarded PA Works Well! Good Surface Aspect in Consumer Applications Food Packaging with PA6 & PA66.

Properties of nylon injection molding

High mechanical strength, good toughness, and high tensile and compressive strength.

The fatigue resistance is outstanding, and the parts can still maintain the original mechanical strength after repeated repeated bending.

High softening temp. and heat resistance.

Smooth surface, low friction coefficient, wear-resistant.

Has excellent electrical properties.

Self-extinguishing, non-toxic, odorless, good weather resistance, inert to biological erosion, good antibacterial and anti-mildew ability.

The parts are light in weight, easy to dye and easy to form. Because of its low melt viscosity, it can flow quickly for easy filling.

Nylon Injection Molding Requirement

Drying Temperature 60-80 °C

Drying Time 4.0-6.0 hr

Suggested Moisture Content <=0.30 %

Rear Barrel Temperature 180-220 °C

Middle Barrel Temperature 200-220 °C

Front Barrel Temperature 220-260 °C

Nozzle Temperature 230-260 °C

Mold Temperature 60-80 °C

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Feman medical parts are essential component of Feman tooling. There is special department in-house that only service for the medical customers. A team with professional skills and full experience form plastic injection mold design, CNC & EDM group and project management will take on an accurate care on all the Feman medical products. Customers no need to worried about the quality and precision of the medical injection molding. 

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