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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 […]
19 08, 2019

Manufacturing core and cavity insert Guideline

By |2019-08-19T16:05:31+08:00August 19th, 2019|Categories: cavity insert, China mold, core insert, molds|Tags: , , |Comments Off on Manufacturing core and cavity insert Guideline

When we manufacture the core and cavity inserts during the mold manufacturing, there are some dimensions that we need to manufacture with some tolerances so that it fits well in the pocket of the insert plate or cavity/core.

And this will save some work when we will fit the cavity & core, high tolerance, and good manufacturing technology will save lots of time for the moldmaster, below are some manufacturing core and cavity insert Guideline that we need to pay attention to make high quality mold.

When we make the corner radius In the manual milling machine, make a 0.2mm big step there, after hardening, we don’t have to grind on the corner when we fit […]

19 08, 2019

Plastic Injection Molding Defect Weld Lines

By |2019-08-19T15:54:06+08:00August 19th, 2019|Categories: molding part defect, molds, Weld Lines|Tags: , |Comments Off on Plastic Injection Molding Defect Weld Lines

Weld Lines is a molding part defect that will reduce the part lifetime or even broken. Before massive production, function testing is very important,

Several years ago a customer transferred an old single cavity mold to our facility. The part was a very simple rectangular ring. It had two sub-gates, one at each end of the part on the short side of the rectangle. The material was glass-filled and made a very strong part.welding line

We made our first sample submission and were approved for production immediately. The next day we delivered the first parts for their order. A couple of weeks after the plastic parts were delivered I […]

16 08, 2019

PBT Injection molding

By |2019-08-19T15:54:09+08:00August 16th, 2019|Categories: molds, PBT Injection Molding, PBT Injection Moulding|Tags: , |Comments Off on PBT Injection molding

Polybutylene terephthalate (PBT) has advantageous combination properties such as a convenient source of raw materials, and mature polymerization process has gotten easier, low cost and easily forming and processing. Nylon, polycarbonate (PC), polyoxymethylene and modified polyphenylene oxide are five major engineering plastics.

PBT Injection Molding (Moulding):

PBT is a kind of crystalline polymer with a sharp melting point (225-235 Celsius degree). Crystallinity can reach 40%. When the temperature rises above the melting point, the liquidity of melt will become obvious. However, when changing from the molten state to the gruel state, it not only has the fast rate of cooling rate but has a fast crystalline speed.

PBT injection moldingIn […]

13 08, 2019

PA (Nylon) Injection Molding

By |2019-08-19T15:54:11+08:00August 13th, 2019|Categories: ABS injection molding, ABS injection moulding, molds, Nylon injection molding, PA injection molding, PA66 injection molding|Tags: , , , , , |Comments Off on PA (Nylon) Injection Molding

Information about PA (Nylon) Injection Molding

Characteristic:
Nylon has tenacious and wearable, self-lubricious and smooth characteristic with non-toxic and antibiosis and high water absorbability. In addition, its tensile strength and stiffness will be sharply decreased with the moisture-absorbing. Then, the size of finished pieces changes greatly. If in the high-temperature environment for a long time, it will be resolved.

It will not soften gradually with increasing high temperature until closing to the extent of melting-point. Once reaching the proper temperature, it will flow. It is soluble in many chemicals. However, gas, lubricating oil, developer, detergent and grease have no effect on nylon.PA injection molding

Advantages:
It has high mechanical strength, good tenacity […]