按标签归档 Surface Property

Surface Properties of Plastic Film

Gloss Haze Surface Energy Slip Blocking From: Handbook of Plastic Films

Surface Modification of Plastic Films

Corona Discharge Antiblocking Slip Additives Lubricants Antistatic Agents From: Handbook of Plastic Films

Surface Modification of Plastic Films – Lubricants

Lubricants are added to assist with processing. The polymer can be extruded more readily when there is a layer of lubricant between the polymer and the surfaces within the extruder. This is particularly important at the die lips. where the lubricant can decrease surface irregularities such as ‘shark skin’ effects. The melt can maintain laminar [...]

Surface Modification of Plastic Films – Slip Additives

The coefficient of friction can be reduced by adding slip agents. The requirement for a slip agent is that it is miscible with the polymer melt, but separates as the polymer is crystallising. Sometimes the separation will rake several hours or days to become complete. The slip agent should form a very thin layer on [...]

Surface Modification of Plastic Films – Antiblocking

Blocking can be reduced by decreasing the surface contact area of the films. Small particles at the surface can decrease the contact. Particles such as silica, diatomaceous earth and talc are useful antiblocking agents. To provide the protection efficiently, they must be included in the polymer during processing. Many of the particles will be in [...]

Surface Properties of Plastic Film – Blocking

The low surface energy and softness of polyethylenes make them self-adhere if pressed together under a load for a considerable time. This self-adhesion is called blocking. The polyolefins can flow, or creep, under load, and so mutual adhesion can occur if the pressure is sufficient or the time of contact is long. This is a [...]

Surface Properties of Plastic Film – Slip

Polyolefin films generally have a smooth surface, with the exception of defects and surfacecrystal structures. They have a low surface energy and so frictional forces are low. Relative to their strength, the frictional forces can cause damage to the films. Slip additives can decrease the frictional forces. The factors that cause poor slip are often [...]

Surface Properties of Plastic Film – Surface Energy

The surface energy of polyolefin films is very low. It is difficult to find other substances that will adhere to polyolefins. Suitable adhesion can be obtained by melt adhesion of polyolefins to each other, but only when the polyolefins are very similar. For instance, polyethylenes have good mutual adhesion. The branched polyethylenes with lower melting [...]

Surface Properties of Plastic Film – Gloss & Haze

Surface Properties Gloss Gloss is the reflection of light from a surface. The nature and origin of gloss and haze are illustrated in Figure. A high gloss requires a smooth surface. Surface imperfections may be introduced by the processing. Excessive drawing into the strain-hardening region will usually reduce the gloss. Blown film usually has a [...]

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