SU605530A3 - Method of manufacturing biaxial orientation hollow articles - Google Patents

Description

The molding of the preform and the blow mold 8 are out of the path of the core 1.

In the second stage, shown in Fig. 2, form 2 is opened to release the core 1 with the blank b, which is removed from the mold 2. With this forming neck of the blank, the ring 9 is retracted together with the core 1 and the blank b. Then, the preform molding 7 of the preform is moved to the molding position under the blown core 1.

In the third stage, as shown in Fig. 3, the blown core 1 with ring 9 for the neck is introduced into the preformed mold 7, and fluid is fed into the channels 10 of core 1 to partially expand the preform to separate it from the core surface. This operation is necessary in order to avoid local thinning with further axial pulling of the workpiece, which may be caused by friction on the core walls. In the fourth stage, as shown in FIG. 4, the workpiece is pulled axially by moving the front part 11 the core 1 in the axial direction under the action of the piston 12. This ensures: the orientation of the workpiece in the axial direction.

At this stage, the preforming mold 7 and the blow mold 8 are removed from the double core 1.

In the fifth step, as shown in Fig. 5, the blow core 1, along with the ring for the neck and the axially stretched workpiece, is installed in the blow mold 8, and through the channels passing through the core, is fed preformed and elongated in the axial direction, the workpiece expands, taking the shape of cavity 13 to form the vessel 14. Depending on the shape of the preformed and axially stretched workpiece, the latter can be inserted through The term blow mold or blow mold disclosed for prrpuska preform. .

After the product is cooled, the neck of the product E is opened, the holder 15 is retracted, and into the mold 8 it is moved from the molding position to the discharge position, where the finished product 14 is removed from

blow molds. Removal of the product can be facilitated by applying a jet of compressed air or by using mechanical devices, such as ejector pins.

The axial or radial orientation steps can be carried out at different temperatures depending on the material.

Thus, before axial stretching of the workpiece, a cooling delay can be introduced. On the contrary, the workpiece or its predetermined ones can be heated to reduce the degree of orientation in these Locations.

The described method allows to improve the quality of the products obtained due to their orientation in the axial and radial directions, as well as due to obtaining a uniform wall thickness in the product.

Claims (6)

Invention Formula A method of manufacturing biaxially oriented hollow articles by the blown method, which includes the steps of obtaining by pouring a hollow billet with a bottom under pressure on the core, intermediate partial expansion of the blank by blowing and final blowing of the blank in the final form into a product that is characterized by the fact that axial stretching of the partially expanded billet is carried out. 2. Method pop.1, characterized in that the preform is pulled out by a part of the core having the possibility of axial reciprocating movement. 3. Method according to Claims 1, 2, and 6, so that the workpiece is cooled before axial stretching. 4. The method according to claim 1, wherein the workpiece is 5 pcs and so that the workpiece is heated before axial stretching. 5. A method according to claim 1, characterized in that a portion of the preform is heated prior to axial stretching. 0 6. A method according to claim 1, characterized in that a multilayer preform is formed on the blown core. Sources of information taken into account in the examination; 55 1. US Patent No. 3244778, cl. 264-89, 1962. 2. The US patent 1,337,637 cl. 264-97, 1968. f dir / Vut.S tput.S