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| Shaping Mode: | Injection Mould |
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Food grade PP plastics standard
PP is one of the common plastics, can be made into any food plastic packaging, such as special plastic bags for food, food plastic boxes, food straw, etc., safe, non-toxic and low temperature resistance, high temperature resistance. For plastic lunch boxes, tableware, food grade PP is the most suitable plastic choice,
PP plastic is the only plastic that can be put into the microwave oven, and has high strength folding performance, 50000 times -20ºC high altitude fall will not be damaged.
Normally, all PP can be considered food grade.
The difference between food grade and industrial grade is:
1. food grade PP under normal conditions and high temperature will not dissolve harmful substances.
2. industrial grade PP at room temperature or high temperature will dissolve harmful substances, harm to human health, some used in food containers, a heat will have a strong odor.
The generation of industrial grade PP is mainly caused by the following reasons:
1. Defective or contaminated raw material particles produced during the decomposition of petroleum.
2. food grade PP in the production of food containers produced in the process of waste (commonly known as: nozzle) again for recycling, this part is basically contaminated, if used to produce food containers will affect the quality, strict requirements of the factory will isolate this part as industrial grade PP resale.
These industrial PP S are often low cost and are used by poor manufacturers to produce food containers.
Thin-wall lunch box mold manufacturing steps
The manufacture of thin-walled lunch box injection mould is a high-precision and difficult project, requiring manufacturers to have good professional knowledge and experience, but also have patience and care. Here are some reference steps on how to make thin-walled lunch box injection molds:
The first step: the program design, according to customer needs to determine the specifications, size, shape and other parameters of the lunch box injection mould requirements.
The second step: carry out CAD 3D modeling, translate the lunch box design drawing provided by the customer into a 3D model, and design some details according to the actual situation.
The third step: CAM numerical control programming, according to the 3D model data numerical control programming, determine the movement trajectory of the machine tool, develop the processing process route and tool use plan.
The fourth step: mould processing, according to the requirements of CAM programming, the use of CNC machine tools to process metal sheets, the bulk material gradually cut into the prototype of the mold.
The fifth step: electrode manufacturing and processing, electrode manufacturing according to the mold prototype, electrode processing, forming the details of the mould and internal structure.
The sixth step: precision grinding processing, precision grinding of the mould to meet the design requirements.
Step 7: Perform mould testing, test the mould to ensure that the mould meets customer requirements.
In short, the manufacture of thin-walled lunch box injection molds requires a set of industry skills and a high level of machining technology, but also need to have a high degree of self-requirements and self-restraint, only in this way can we produce high-quality injection molds.
Plastic lunch box mould show
Plastic lunch boxes have become increasingly popular in recent years as they allow people to eat quickly and save time. On the market, there are many different types of plastic lunch boxes, but the most common ones are rectangular and round. According to the requirements of customers, are generally large output, high quality requirements. We recommend the use of H13 steel, hot runner, multi-cavity, mirror polishing, multiple groups of waterways to shorten the cycle.
Factors affecting cooling time in injection molding
In the process of plastic food container injection molding, cooling time accounts for 80% of the injection molding cycle, the injection molding cycle is an important factor affecting the injection molding cost. Reducing the cooling time of injection molding is an important means to reduce the cost of injection molding.
1. Selected injection mold steel
If you want to improve the cooling efficiency, the die steel with better thermal conductivity should be preferred when selecting materials.
2. Layout of waterway molding
In the design of injection mold channel, the hot spot of product structure design should be fully evaluated. To achieve this, it is necessary to consider designing a separate circulating water channel and using the beryllium copper insert just mentioned, or adding heat conduction needles and installing cooling tools for heat conduction tubes for the thin-wall insert. Mould channel as far as possible to use straight channel, reduce the design of too many cooling Wells and corners of the channel, to avoid too much dead water area. In the mold design stage, reasonable arrangement of cooling water channel layout, basically ensure the cooling effect.
3. Mold temperature
It is determined by measuring the actual temperature of the inlet point and outlet point on the surface of the mold cavity. If the temperature difference between different areas and the set value can be controlled within ±5ºC, the basic cooling effect is acceptable.
4. Daily maintenance of injection molds
If the surface of the mold is greasy or dirty, it will generally reduce the cooling efficiency. The cavity surface should be cleaned and the forming channel cleaned with a cleaning machine. Daily startup inspection needs to increase the monitoring of cooling water flow, and any abnormality should be dealt with in time.
| CNC Plastic Precision Mechanical Dummy Prototype | 1. CNC ABS part |
| 2. CNC PC clear part | |
| 3. CNC PMMA transparent | |
| 4. CNC plastic part | |
| 5. CNC machining prototype | |
| 6. Vacuum casting molding | |
| 7. Vacuum casting TPU part | |
| 8. Silicon rubber molding partpart | |
| 9. Small production by SLA/vacuum casting | |
| Plastic material | ABS, PP, PC, POM, PMMA, NYLON, TPE, TPU etc |
| Color | RAL/PANTONE color |
| Prototype surface finish | Polishing finish,Texture Finish,Glossy Finish,Painting,Slik print,Rubber Painting etc |
| 1) Good quality with competitive price |
| 2) Have rich experienced design and satisfy you |
| 3) The quotation will be submit after you inquiry from us |
| 4) Every week will provide mould proccess & photos |
| 5) Trail samples freely to send you by couriers for confirm |
| 6) Packing and shipping moulds after confirm all proccess from our work |
| 7) Hard Working, Sincerity, Honesty, Responsibility is our personality |
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