Transparent plastic plates material properties of plastic plates has light weight, good toughness, molding easily, low cost advantages, so in modern industrial and household products and sign LOGO, more and more transparent plastic instead of glass products, special applied optics instrument and packaging industry, especially rapid development.
But because of its better transparency, abrasion resistance, impact resistant firmware is better, so the plastic component, the whole process of injection molding processing technology, equipment, molds, etc. , are precisely controlled to ensure that these plastic panels used to replace the glass (
Transparent plastic products)
, good surface quality, so as to meet the requirements of use.
On the market at present commonly used transparent plastic polymethyl methacrylate, (
PMMA is commonly known as the force that press a gram or organic glass)
, terephthalic acid glycol polyester (
, transparent nylon, acrylic eyes a styrene copolymer (
, polysulfone (
And so on, which we have the most contact is PMMA, PC and PET three types of plastic, with these three kinds of plastic, for example, the following discussion transparent plastic properties and injection molding.
Firstly, performance transparent plastic panels must have a high transparency, next to have a certain strength and abrasion resistance, impact resistance, heat resistance, chemical resistance to optimal, bibulous rate is smaller, with all of the above performance can meet the requirements of the sign of transparency and unchanged for a long time.
Transparent plastic performance compare performance density (
Tensile strength (
Notched impact (
Deformation temperature (
Allow 1 water shrinkage wearability chemical resistance PMMA.
18, 75, 1200, 92, 95.
5 good PC 1.
20 66 1900 90 137.
6 what PET 1.
37, 165, 1030, 86, 120.
03 2 good optimal data from known PC is ideal choice, but the Lord in the raw material price and injection molding process is more difficult, so still is given priority to with selection of PMMA,
To the general requirements of plastic signs products)
And RET because it after stretching to get good mechanical properties, so many used in packaging and containers.
Second, transparent plastic panels should be paid attention to during the process of injection molding items!
Transparent plastic because want to high light transmittance, inevitable requirement strict plastic plate surface quality requirement, there cannot be any markings, porosity, white fog, dizzy, defects such as poor black spots, color and luster, thus in the whole process of raw materials, equipment, tooling, injection molding and the design of the product, will be very attention and strict even special request.
Secondly because of the transparent plastic more for high melting point, poor liquidity, thus to ensure the surface quality of the product, tend to be at a higher temperature, injection pressure, injection speed, make minor adjustment to the process parameters, such as will not produce internal stress caused by the deformation and cracking products.
This paper is we are in the process of production accumulated some experience, provide everyone reference, reprint please indicate the article from: gains sign factory