Understanding Cutting Devices for Extrusion Blow Molding Machines
What Are the Types of Cutting Devices for Extrusion Blow Molding?
According to the different functions, the cutting devices of Extrusion Blow Molding machine are distinguished as : 1. Cutting the parison before forming. 2. Cutting the bottle neck of the semi-finished product.
1. Knives for cutting the parison before forming are separated as: (1)Hot Cutter (2) Cold Cutter (3) Cold Cutter Sealing (Cold Cutter includes the sealing mechanism)
2. Knives for cutting the bottle neck of the semi-finished product are separated as: (1) On-machine spin trimmer (2) Independent spin trimmer (3) Linear spin trimmer (4) Centrifugal spin trimmer
1. Knives for cutting the parison before forming are separated as: (1)Hot Cutter (2) Cold Cutter (3) Cold Cutter Sealing (Cold Cutter includes the sealing mechanism)
2. Knives for cutting the bottle neck of the semi-finished product are separated as: (1) On-machine spin trimmer (2) Independent spin trimmer (3) Linear spin trimmer (4) Centrifugal spin trimmer
Read more - What is the parison controller?
How Do Hot Cutters, Cold Cutters, and Cold Cutter Sealings Differ?
1. Hot cutter device: The electrical hot cutter contains a transformer, using electricity to heat the cutter and the temperature is adjustable. Including smelting and cutting functions, the cutting ability is good for all kinds of material. The disadvantage is power consumption, and it may trigger a fire under improper operations or neglect of maintenance.
2. Cold cutter device: The quantity and the width of the cutter are customized according to the cavity numbers and the center distance. The sharp tip of the cutter as well as the high speed puncturing can cut the parison. The disadvantage is the low percentage of the universality for different cavities of the mold, and the possibility of hurting operators by flying blade without proper maintenance of the cutter device.
3. Cold cutter sealing device: Each one blade is equipped at the front and back of the device to cut the parison simultaneously just like teeth cutting the food. In addition, it is equipped with a packaging device that squeezes and seals the parison, which can cut off the parison while sealing the opening of the bottom parison, so it can perform "support air". It is very useful in the production of square products ,greatly reducing the difficulty of forming and strengthening the strength of the four corners. The disadvantage is the complicated mechanism with a higher price.
** PP, EPET, PETG can only be cut by hot cutter, or the unqualified products will be produced by incompletely cutting of the parison.
2. Cold cutter device: The quantity and the width of the cutter are customized according to the cavity numbers and the center distance. The sharp tip of the cutter as well as the high speed puncturing can cut the parison. The disadvantage is the low percentage of the universality for different cavities of the mold, and the possibility of hurting operators by flying blade without proper maintenance of the cutter device.
3. Cold cutter sealing device: Each one blade is equipped at the front and back of the device to cut the parison simultaneously just like teeth cutting the food. In addition, it is equipped with a packaging device that squeezes and seals the parison, which can cut off the parison while sealing the opening of the bottom parison, so it can perform "support air". It is very useful in the production of square products ,greatly reducing the difficulty of forming and strengthening the strength of the four corners. The disadvantage is the complicated mechanism with a higher price.
** PP, EPET, PETG can only be cut by hot cutter, or the unqualified products will be produced by incompletely cutting of the parison.
Read more - What is Extrusion Blow Molding used for? Top 10 examples
What Are the Differences Among Various Spin Trimmers?
It is used to cut the bottle neck of the semi-finished product, so it is also called the bottle neck cutting machine.
1. On-machine spin trimmer: Installed at the side and connected to the Extrusion Blow Molding machine. The spin trimming is proceeded after the bottle enters and moves ahead. The disadvantage is no support under the spin trimmer which may cause incomplete cutting by inclined delivery for heavier or bigger mouth bottles.
2. Independent spin trimmer: The running theory is the same with On-machine spin trimmer, but the body is independent from the Extrusion Blow Molding machine and adding the conveyor independent control cabin. So it can be used independently or coupled with other machines.
3. Linear spin trimmer: Conveyor and independent control cabin are attached under the machine, it can be used independently or connected to Extrusion Blow Molding machine.
** The heating function for cutter is optional for the three types of spin trimmer above to facilitate the cutting of some special materials like EPET.
4. Centrifugal spin trimmer: It should be installed with the Extrusion Blow Molding machine. Due to the unique high speed centrifugal cutter, it can cut ultra thin or ultra soft finished products.
1. On-machine spin trimmer: Installed at the side and connected to the Extrusion Blow Molding machine. The spin trimming is proceeded after the bottle enters and moves ahead. The disadvantage is no support under the spin trimmer which may cause incomplete cutting by inclined delivery for heavier or bigger mouth bottles.
2. Independent spin trimmer: The running theory is the same with On-machine spin trimmer, but the body is independent from the Extrusion Blow Molding machine and adding the conveyor independent control cabin. So it can be used independently or coupled with other machines.
3. Linear spin trimmer: Conveyor and independent control cabin are attached under the machine, it can be used independently or connected to Extrusion Blow Molding machine.
** The heating function for cutter is optional for the three types of spin trimmer above to facilitate the cutting of some special materials like EPET.
4. Centrifugal spin trimmer: It should be installed with the Extrusion Blow Molding machine. Due to the unique high speed centrifugal cutter, it can cut ultra thin or ultra soft finished products.
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