Blow Moulding Machine And Blow Moulding Method
Blow Moulding Machine And Blow Moulding Method
The present invention relates to an blow moulding machine or blow unit and to an blow moulding method for blow moulding plastic materials (e.g., elastomeric materials), particularly according to cold channel and hot channel techniques, comprising an extruder, a first piston/cylinder unit and a second piston/cylinder unit mounted in series thereto. The cylinder of the first piston/cylinder unit leads into the end of the second piston/cylinder unit located at a distance from an blow mould to be filled. According to the bottle blow moulding machine, the elastomeric material is firstly led by means of the first piston/cylinder unit through the cylinder of the second piston/cylinder unit and into the blow mould, wherein the piston of the second piston/cylinder unit frees the flow path to the blow mould. Afterwards, the piston of the second piston/cylinder unit is displaced into the corresponding cylinder in order to introduce the elastomeric material located inside the second cylinder into the blow mould. The piston is retracted once the elastomeric material has been vulcanised on the cold channel nozzles.
The present invention relates to a , in particular an blow unit and a method for blow moulding plastic materials, in particular elastomers or caoutchouc material, according to cold channel and hot channel techniques.
Usually, according to the cold channel technique, several blow- moulded products are made simultaneously in one blow moulding process, wherein the caoutchouc material is led through a cold channel block in which individual channels extend to several cavities in a mould for the respective blow- moulded products. Before opening the mould, the blow piston of the blow moulding machine has to be retracted in order to relieve pressure from the cold channel, wherein the relatively long channels make the backflow of the material more difficult. Furthermore, known blow moulding machines are disadvantageous in that often waste material remains in the blow tube channel after the blow.
It is often the case with hot channel methods that the material remains at the wall of the blow tube channel and the machine nozzle in the form of a tube and the new material is passed through this tube. At high shear rate, the tube consisting of vulcanised material may come off and block the machine nozzle and the runner system. Thus, in order to ensure a complete emptying of the blow tube, in practice, a short ˇ°pre-ejection processˇ± has to take place before.
The present invention relates to an blow moulding machine or blow unit and to an blow moulding method for blow moulding plastic materials (e.g., elastomeric materials), particularly according to cold channel and hot channel techniques, comprising an extruder, a first piston/cylinder unit and a second piston/cylinder unit mounted in series thereto. The cylinder of the first piston/cylinder unit leads into the end of the second piston/cylinder unit located at a distance from an blow mould to be filled. According to the bottle blow moulding machine, the elastomeric material is firstly led by means of the first piston/cylinder unit through the cylinder of the second piston/cylinder unit and into the blow mould, wherein the piston of the second piston/cylinder unit frees the flow path to the blow mould. Afterwards, the piston of the second piston/cylinder unit is displaced into the corresponding cylinder in order to introduce the elastomeric material located inside the second cylinder into the blow mould. The piston is retracted once the elastomeric material has been vulcanised on the cold channel nozzles.
The present invention relates to a , in particular an blow unit and a method for blow moulding plastic materials, in particular elastomers or caoutchouc material, according to cold channel and hot channel techniques.
Usually, according to the cold channel technique, several blow- moulded products are made simultaneously in one blow moulding process, wherein the caoutchouc material is led through a cold channel block in which individual channels extend to several cavities in a mould for the respective blow- moulded products. Before opening the mould, the blow piston of the blow moulding machine has to be retracted in order to relieve pressure from the cold channel, wherein the relatively long channels make the backflow of the material more difficult. Furthermore, known blow moulding machines are disadvantageous in that often waste material remains in the blow tube channel after the blow.
It is often the case with hot channel methods that the material remains at the wall of the blow tube channel and the machine nozzle in the form of a tube and the new material is passed through this tube. At high shear rate, the tube consisting of vulcanised material may come off and block the machine nozzle and the runner system. Thus, in order to ensure a complete emptying of the blow tube, in practice, a short ˇ°pre-ejection processˇ± has to take place before.