KR930001997Y1 - Heat resisting biaxial orientation bottles - Google Patents

Abstract

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Description

Heat Resistant Biaxial Orientation Bottle

1 is an external view of a biaxial alignment bottle according to the present invention.

2 is a cross-sectional view taken along the line II-II of FIG.

3 is a longitudinal cross-sectional view of the left half showing the state before molding and the right half showing the state after molding, with the neck of the bottle together with the mold.

4 is a longitudinal sectional view of a conventional biaxial alignment bottle.

The present invention relates to a heat-resistant biaxial alignment bottle for forming a crystalline resin such as polyethylene terephthalate by stretch blow molding.

Biaxially oriented bottles are formed by stretching injection and extrusion molded preforms axially in the mold and expanding the preforms radially.

This stretch blow molding is achieved by receiving the biaxial orientation of the parts below the neck of the bottle, namely the body and bottom, while supporting the preformed neck. The part is left in an injection or compression molded state.

4 shows a conventional biaxially oriented die with preform and mold.

The neck 1 is formed when the preliminary form 4 is molded, the outer periphery has a threaded portion 1a, and the support ring 1b is formed around the lower portion of the threaded portion 1a.

The body part 2 and the boundary part 3 are formed by drawing the preliminary shape 4 in the mold 5 in two directions, ie, in the axial direction and the radial direction, and the wall thickness is the body part 2 from the top of the boundary part 3. Decreases to).

Stretching of the preliminary form 4 is achieved by closing the blow mold 5 and using the stretching rod 7 and air pressure while supporting the neck 1 by the wood mold 6. The preliminary form 4 is axially stretched by the elongate rod 7 and is expanded in the radial direction by blowing air into the preliminary form at the same time or thereafter. The axial elongation of the preliminary form 4 extends over all parts except for the portion of the neck 1 supported by the wood mold 6 and corresponds to the boundary 3 of the preform 4. Is elongated in the axial direction similar to the part corresponding to the body part 2, but is not sufficiently drawn in the radial direction because the expansion ratio is smaller than that corresponding to the body part 2.

Performance improvements such as pressure resistance, insect repellency, heat resistance, and gas barriers for these types of bottles are seen in the biaxial orientation.

Since the performance is proportional to the degree of orientation, the portion close to the neck 1, in particular, the lower portion of the support ring 1b is inferior in heat resistance to the portion close to the body 2.

When such a biaxially oriented bottle is filled with a liquid heated to a temperature substantially equal to the molding temperature, the boundary 3 between the neck 1 and the body 2 is thermally deformed, distorted and often leads to tilting. This results from the fact that in the biaxially oriented part, the boundary part 3 has the lowest degree of orientation and smaller wall thickness than the neck part 1.

Therefore, when the biaxially oriented bottle is used as a bottle for packaging the contents requiring heating, the heat resistance of the boundary 3 should be improved in this way or that way.

The present invention has been achieved in order to solve the problem of heat resistance in the biaxial alignment bottle in the simplest way.

The object of the present invention is to increase both the inside and outside surface area of the boundary, which is hardly subjected to biaxial orientation due to the shape of the bottle, thereby increasing the crystallinity to improve the heat resistance of the boundary, and the boundary almost deforms thermally even by heating and filling. In order to prevent this from happening, it is to provide a biaxially oriented bottle in which a plurality of longitudinal rods are formed in parallel in a boundary portion.

Another object of the present invention is a packaging bottle, which does not damage the appearance. Despite the small expansion of the boundary, a plurality of longitudinal poles formed at the boundary between the body and the neck in order to increase the internal and external surface area and increase the mechanical strength It is providing the heat resistant biaxial orientation bottle with which it was provided.

In the packaging bottle of the present invention having the above object, the peripheral wall of the boundary portion is formed with a plurality of longitudinal ribs arranged side by side to increase the surface area of the inner and outer surfaces of the boundary portion and the heat resistance is proportional to the increased amount of the surface area. It is improved by biaxial orientation.

As a means to increase the surface area of the boundary, it is possible to expand the peripheral wall of the boundary, in which case the effect cannot be obtained without increasing the expansion rate and the appearance of the bottle is damaged by the expanded boundary.

Moreover, the wall thickness is reduced, and therefore the mechanical strength is lowered.

However, for many longitudinals in which the inner and outer surfaces are both expanded outward to form a curved surface, the surface area is increased by the curved surface of each longitudinal and biaxial orientation can be achieved without increasing the expansion rate of the boundary and the boundary is longitudinal Although the wall thickness is reduced to some extent by the presence of the band, the mechanical strength does not decrease.

In addition, the number of rods can be appropriately selected, and the rods can be formed at the boundary considering the shape and appearance of the bottle, and therefore the value of the bottle as a packaging bottle is not reduced by the improvement of heat resistance.

The present invention will now be described in detail by way of examples.

In the embodiment of the present invention shown in FIGS. 1 to 3, the inner and outer surface areas of the boundary between the neck portion 11 and the body portion 12 are all increased.

The increase in surface area is achieved by successively forming a number of longitudinal poles 13c in which the inner surface 13a and the outer surface 13b are bent outward at the boundary 13 below the support ring.

In this embodiment sixteen longitudinal bars 13c are provided to increase the surface area of the boundary 13. The number of longitudinals may be appropriately selected depending on the diameter of the boundary 13. The surface area may increase as the number of longitudinal bars 13c increases.

However, if the number of the vertical poles 13c increases, it becomes difficult to form both the inner surface 13a and the outer surface 13b with respect to each longitudinal pole 13c by curved. The outer surface 13b provides a curved surface but causes an obstacle in increasing the surface area of the boundary inner surface so that the inner surface is not bent. Therefore, the number of cell bands 13c stays within the range where both internal and external surface areas can be bent.

3 shows the molded state of the vertical rod 13c.

Preforms are obtained by injection or extrusion.

The part forming the neck 11 of the bottle is supported by the wood mold 16 and placed in the blow mold 15 and the preliminary 14 is then axially stretched by an extension rod and radially by air pressure. , The peripheral wall of the boundary 13 is likewise expanded. In order to smoothly expand the boundary 13 in the radial direction, a clearance for proper expansion is formed between the portion corresponding to the boundary 13 of the preform 14 and the mold surface of the blow mold 15. desirable.

Since the longitudinal poles are formed by pressing them to the blow mold 15, continuous recesses 17 are formed endlessly in the inner circumference at a portion corresponding to the boundary 13 of the blow mold 15 in the required number of side surfaces.

Preferably, the temperature of the preform 14 during molding is maintained at about 100 ° C.

The preliminary form 14 is expanded by an air pressure of approximately 25 kg / cm ³ so that the peripheral wall of the boundary 13 can be formed into a cell band 13c in which both the inner surface 13a and the outer surface 13b are bent. have.

In a bottle consisting of a plurality of longitudinal rods 13c continuously formed side by side as described above, the surface area of the inner and outer surfaces is bent outwardly and is increased by the expanded longitudinal rods 13c, and the degree of orientation is also increased. Is increased equally.

Therefore, crystallinity also increases, and eventually heat resistance improves.

In fact, even if the bottle is filled with hot water heated to a temperature of 90 ° C. or higher, there is no distortion of the boundary 13 due to thermal deformation and no inclination of the neck 11 occurs.

The mechanical strength of the boundary portion 13 is increased by the longitudinal pole 13c, and the wall thickness of the boundary portion can withstand the external force from above even if it is formed thinner than the prior art, and no buckling occurs during the filling process.

Moreover, many longitudinal bars are externally integrated with the threaded portion and the support ring around the neck portion 11, and only the vertical bars are inconspicuous.

Therefore, the appearance of the bottle as a packaging bottle is not damaged and the bottles as a biaxially oriented bottle having heat resistance are widely applied.

Claims (3)

In heat-resistant biaxially oriented bottles in which injection- or extruded preforms formed of crystalline resins such as polyethylene terephthalate are elongated in a blow mold in the biaxial direction and expanded by air pressure, crystallinity and mechanical strength of the boundary portion are increased. Heat-resistant biaxial alignment bottle, characterized in that a plurality of longitudinal poles for increasing the surface area of the inner surface and the outer surface of the boundary portion is formed in parallel with the boundary portion. The heat resistant biaxially oriented bottle according to claim 1, wherein the vertical pole has an outer curved surface and has both an expanded inner surface and an outer surface. The heat-resistant biaxial alignment bottle according to claim 1, wherein the longitudinal column is located under the neck support ring.