Blown Film Extrusion
For Mapco to cover an order for a blown film extrusion is a regular job. clients from around the world order the reels with precise specifications. these reels are easier to order and produce because printing and sealing on the reels can be done at any time by the client. this saves cost and room. Blown Film extrusion is by far Mapco's biggest asset.
Mapco Also produces shrink-wrap in Pakistan and is shipped easily else where in the world. In today's day and age it is an essential product for the fright industry. It is easy to use. and easy to manage. With the shipping industry growing by the minute and the world turning into a global village. this product needs to be produced massively, Mapco is doing just that.
The manufacture of plastic film for products such as shopping bags is achieved using a blown film line.
Plastics extrusion is a high volume manufacturing process in which raw plastic material is melted and formed into a continuous profile. Extrusion produces items such as pipe/tubing, weather stripping, window frames, adhesive tape and wire insulation.
The die in blown film extrusion is an upright cylinder with a circular opening similar to a pipe die. The diameter can be a few centimetres to more than three metres across. The molten plastic is pulled upwards from the die by a pair of nip rolls high above the die (4 metres to 20 metres or more depending on the amount of cooling required). Changing the speed of these nip rollers will change the gauge (wall thickness) of the film. Around the die sits an air-ring. The air-ring cools the film as it travels upwards. In the centre of the die is an air outlet from which compressed air can be forced into the centre of the extruded circular profile, creating a bubble. This expands the extruded circular cross section by some ratio (a multiple of the die diameter). This ratio, called the “blow-up ratio” can be just a few percent to more than 200 percent of the original diameter. The nip rolls flatten the bubble into a double layer of film whose width (called the “layflat”) is equal to ½ the circumference of the bubble. This film can then be spooled or printed on, cut into shapes, and heat sealed into bags or other items.
Mapco Also produces shrink-wrap in Pakistan and is shipped easily else where in the world. In today's day and age it is an essential product for the fright industry. It is easy to use. and easy to manage. With the shipping industry growing by the minute and the world turning into a global village. this product needs to be produced massively, Mapco is doing just that.
The manufacture of plastic film for products such as shopping bags is achieved using a blown film line.
Plastics extrusion is a high volume manufacturing process in which raw plastic material is melted and formed into a continuous profile. Extrusion produces items such as pipe/tubing, weather stripping, window frames, adhesive tape and wire insulation.
The die in blown film extrusion is an upright cylinder with a circular opening similar to a pipe die. The diameter can be a few centimetres to more than three metres across. The molten plastic is pulled upwards from the die by a pair of nip rolls high above the die (4 metres to 20 metres or more depending on the amount of cooling required). Changing the speed of these nip rollers will change the gauge (wall thickness) of the film. Around the die sits an air-ring. The air-ring cools the film as it travels upwards. In the centre of the die is an air outlet from which compressed air can be forced into the centre of the extruded circular profile, creating a bubble. This expands the extruded circular cross section by some ratio (a multiple of the die diameter). This ratio, called the “blow-up ratio” can be just a few percent to more than 200 percent of the original diameter. The nip rolls flatten the bubble into a double layer of film whose width (called the “layflat”) is equal to ½ the circumference of the bubble. This film can then be spooled or printed on, cut into shapes, and heat sealed into bags or other items.
