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31 08, 2019

POM Injection Molding Technology

By |2019-08-23T16:42:46+08:00August 31st, 2019|Categories: molds, POM, POM Injection Molding, POM Injection Molding Technology|Tags: , , |Comments Off on POM Injection Molding Technology

POM (also called acetal) is polymerized by formaldehyde and other raw materials, etc. POM-H (Polyoxymethylene homopolymer), POM-K(Polyoxymethylene copolymer) are thermoplastic engineering plastic with high density and crystallinity. It has good physical, mechanical and chemical properties, especially excellent rub resistance.

POM Injection Molding Technology is a crystalline plastic with an obvious melting point. Once it reaches the melting point, the melt viscosity will rapidly decrease. When the temperature exceeds a certain limit or the melt is heated too long, it will cause decomposition. Copper is POM’s degradation catalyst, the areas contacting with POM melt should avoid the use of copper or copper materials.POM INJECTION MOLDING

  1. Processing of […]
30 08, 2019

Mold Cooling Channel Manufacturing

By |2019-08-30T21:21:51+08:00August 30th, 2019|Categories: Mold Cooling Channel Manufacturing, molds|Tags: , |Comments Off on Mold Cooling Channel Manufacturing

This manufacturing tip is for plastic injection molds that have round inserts with o-rings and cooling channel on the outside.

When we put the insert with the o-ring into the hole in the insert sometimes we damages the o-ring, because the edge in the cooling hole is too sharp and the edge cuts away a part of the o-ring and damaged the o-ring, to avoid this issue we need to add small chamfer to the edge of the cooling hole in the insert plate, when the o-ring comes to the cooling hole the o-ring will not be damaged since the edge area is smoothly.

Below red cycle area, the edge is too sharp, it will damage the […]

28 08, 2019

Blow Molding Process

By |2019-08-23T16:15:52+08:00August 28th, 2019|Categories: Blow Molding Process, Blowing Molding, bow molded products, China mold, Inject2blow, injection blow molding|Tags: , , , , |Comments Off on Blow Molding Process

Blow molding is kind of molding process of placing the molten preform into the blow mold, injecting the compressed air, and the performance will be stick to the mold cavity wall, after cooling and mold release we got the blow molded products we want. Blow molding can be applied for the production of plastic containers as bottles, pots, barrels, and daily uses, children’s toys, etc.

The major materials for blow moldings are Polyethylene, PVC, polystyrene, linear resin, polycarbonate… The consumption of HDPE takes the first place in blow molding, it is widely used in food, chemical and disposing of liquid packaging. PVC container is more popular in cosmetics and detergent packaging for its good transparency […]

25 08, 2019

Polystyrene PS Injection Molding

By |2019-08-21T16:02:00+08:00August 25th, 2019|Categories: China mold, molds, PS injection moulding, PS plastic moulding|Tags: , , , , , , |Comments Off on Polystyrene PS Injection Molding

Polystyrene (PS, GPS) is commonly known as ordinary styrene hard plastic which is transparent and belongs to translucent plastic (with greater density than water, fragility).

The properties of PS include good optical performance 88%-92%, excellent electrical performance, easily molding and processing and good colorability. Its disadvantages include fragility, low temperature of heat-resisting, high requirements for processing and molding conditions (distinct Aging and great sensitivity to heat) weak acid resistance, easy to burn. If there is no fire source and it will burn continually with yellow color, thick black charcoal, blistering, and monosomy.

PS injection molding

Viscosity is sensitive to the velocity of shear. With the increase of pressure, melt viscosity […]

23 08, 2019

PET Injection Molding

By |2019-08-19T15:54:06+08:00August 23rd, 2019|Categories: molds, PET injection molding, PET plastic molding, PET plastic moulding|Tags: , , , |Comments Off on PET Injection Molding

The injection techniques of poly terephthalic acid alcohol ester (PET)

The chemical name of PET is poly terephthalic acid alcohol ester, also called polyester. At present, GF-PET is used by most clients. PET injection molding parts are mostly used in the bottle preform products

PET has a good rheological property in molten condition and pressure has more effects on viscosity than temperature does. Therefore, we change the rheological property mainly from the pressure.

Plastic drying

Due to PET macromolecule contains an aliphatic base, it has certain hydrophilicity. The aggregate is very sensitive to water when it’s at a high temperature. When the water content exceeds the limit, the molecular weight of the PET will drop during the processing, […]

22 08, 2019

Die Casting Mold Design Guideline

By |2019-08-21T20:16:54+08:00August 22nd, 2019|Categories: Die Casting Mold, Die Casting Mold Design Guidelines, molds|Tags: , |Comments Off on Die Casting Mold Design Guideline

In order to be able to think in the same way within SinereTech, and to be able to use dimensions that are suitable for all applications we have created the following guidelines. Those guidelines will be used by the calculation engineers as well as a base for our designers in case of any die casting mold project.

  1. Injection gate and overall layout.
    1. Generally, the injection gate will be placed along the longest side of the part and the injection gate cylinder will be on the closest distance to that side (runner will normally not go around the cavity like a banana).
    2. If sliders are used or if other factors may influence the placement of […]
21 08, 2019

A plate Manufacturing

By |2019-08-21T16:06:23+08:00August 21st, 2019|Categories: A plate Manufacturing, Mold manufacturing, molds|Tags: , |Comments Off on A plate Manufacturing

Mold manufacturing is not an easy job, if you do not have any good team or experience in this field, I suggest you find a profession plastic mold company to support you, you could do the molding process at your side but make the mold outsource, because make plastic mold need very high technical skill for every worker, compared to injection molding process, mold manufacturing needs more manual jobs than injection molding service, and need high technical requirement as well, below is one of manufacturing guideline for A plate of mold.

When we manufacture the A plate for plastic mold, there are some dimensions that we need to manufacture with some tolerances so that our […]

21 08, 2019

Mold Trial Process

By |2019-08-19T15:54:06+08:00August 21st, 2019|Categories: injection mold manufacturing, Mold Trial, Mold Trial Process, molds|Tags: , , |Comments Off on Mold Trial Process

When a new injection mold manufacturing is completely finished, the next step is mold trial (testing), to trial the mold we need to check some important information to avoid any mistake, we need to check the plastic material, samples color, quantity samples that we should send to customer, any special tolerance if needs to be verified during the mold trial, etc, below is our mold trial procedures & processes,Mold trial

  1. Set barrel temperature according to recommendations from the material supplier. Middle of recommended in front and lower end of recommended in back, if don’t have date sheet, reference from mold flow report. Record actual melt temp […]
20 08, 2019

Mold manufacturing guideline for the clamping plate

By |2019-08-19T15:54:06+08:00August 20th, 2019|Categories: clamping plate, molds|Tags: |Comments Off on Mold manufacturing guideline for the clamping plate

When we manufacture the cavity side of the clamping plate, there are some dimensions that we need to control with some tolerances so that our standard mold components and other parts can fit well in the clamping plate.

For the locating pinholes, the tolerance should be H7 (0/+0.015mm)

The hole diameter for the locating ring, the tolerance should be ±0.02mm

The hole diameter for the Hot runner manifold support insert, the tolerance should be ±0.05mm

The height dimension for the air venting groove on the Hot runner manifold support insert, the tolerance should be ±0.01mm

The slot for the locating pin to the sprue bushing, the tolerance should be 0/+0.10mm

The location of the hole for the locating pin is important, […]

20 08, 2019

Mold Modification Process

By |2019-08-19T15:54:06+08:00August 20th, 2019|Categories: Chinese mold, Chinese mold company, Chinese mold maker, Chinese molding company, molds, Plastic Mold Companies, plastic mold company, plastic mold maker, plastic mold manufacturer, Plastic mold manufacturers|Tags: , , , , |Comments Off on Mold Modification Process

As a professional plastic mold company, during mold manufacturing, we normally have some requirement for mold modification, this is a very common issue when we manufacture molds for our customer, below is a step that how to handle this modification in our mod companymold modification

  1. When we receive a request for modification from our customer. After that, we analyze the requested modification, which must be done at least within the same day as the files have been received or latest the morning after if the files have been received in the afternoon. It is important to create a clear illustration of the modification (ppt file […]