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Ⅲ.

Explanation of Molding

The plastic parts made by these molding techniques have some characteristics. You can find

them on the parts used for this robot as well as other plastic parts around your house. Here,

the typical phenomena is explained in the case of injection molding.

・

Gate

In injection molding, there must be a gate to pour in the plastic. The solid plastic taken out of

the molds has the extra amount at the gate and it will be cut off to finish the part. Therefore,

the plastic part made by injection molding has a remain of the gate. Let’s try to find the marks

of the gates on the various plastic parts. Since cutting off the extra plastic at the gate makes a

mark on the plastic part, the gate is often located at the position, where it will not be noticed.

・

Parting line

The melted plastic will be pressed into the molds to spread all over the inside. Though the

molds are joined tightly, there will be partings between the molds, and the melted plastic will

get into there, making the line on the surface. This line is called the parting line. Since the

parting of the molds makes this line, it is usually designed to in such a way that the parting

lines will not be noticeable on the finished product.

2. Molded Plastic Parts

●

The characteristics of injection molding

A remain of the gate : 
Melted plastic was poured in here.

Parting line

The part where the
molds meet.

・

Gate

・

Parting line

Ⅲ.

Explanation of Molding

・

Weld line

As explained in the previous pages, the molds have the shape exactly opposite of the plastic

part. Therefore, to make a projection on the plastic, the mold must have a hole for it, and to

make a hole in the plastic, the mold needs to have a pin for it. When the mold has the pin, it

will divide the stream of the melted plastic. But the divided streams will soon join again

passing around the pin, leaving a trace of the juncture. This trace is called a weld line. When

you look at the plastic surface around the hole made by the pin on the mold, you may be able

to find the line grown from the hole. The mold surface is also designed to have a good flow of

the melted plastic to avoid making the weld line.

・

Shrinkage

Plastic shrinks a little when it hardens. How much it shrinks depends on the material and the

thickness of the plastic. When the thickness of the plastic is uneven, a thicker portion will

shrink more than other portions. The shrinkage differential affects not only the appearance

but also the size of the plastic part. To prevent this, the molds are designed to make the

thickness of plastic even.

・

Weld line

Weld line

Pin on the mold

Juncture

Flow of the
plastic

・

Shrinkage

A thicker portion shrinks
more and makes a de-
pression on the surface.

Adjusting the thickness
makes the plastic shrink
evenly.

Shrink mark

30

31

*MR-9003E  3.7.30 1:47 PM  ページ 30

Содержание MR-9003E

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Страница 12: ...hole Put in small cut up pieces of rubber bands Ping pong table Install fences around the table Goal Goal Make many other creative and fun games and rules How to operate Forward Left rotation Right ro...

Страница 13: ...printed circuit board through which the electric current can pass When the switch on the controller is pushed the switch contact inside is also pushed in and makes a path for the electricity to run th...

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Страница 15: ...ted Mold Explanation of Molding Explanation of Molding The robot has many plastic parts for its body and the controller There are many plastic products around you also When you compare the same plasti...

Страница 16: ...he gate Melted plastic was poured in here Parting line The part where the molds meet Gate Parting line Explanation of Molding Weld line As explained in the previous pages the molds have the shape exac...

Страница 17: ...heating and pressurization and it is removed synthesized synthetic rubber synthetic fiber synthetic leather and called as synthetic resin It sounds like difficult doesn t it Let s explain about plast...

Страница 18: ...them by heat and chemicals These could be other products later Recently package of the products show material of plastic to distinguish each material easily Recently a gift box has a printing of plast...

Страница 19: ...nd vinyl wire might be cut sometimes PCB solves this problem as well You may hard to find the electric machines that is without a circuit board However circuit board has some electricity to avoid elec...

Страница 20: ...er film is that copper made as very flatten and it is the part that let electricity through The board has the copper film only one side is called one sided PCB both side is called double sided PCB bot...

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