CN105050903A - Container provided with a deformable base with a double arch - Google Patents

Abstract

Container (1) made of plastics material, comprising a body (5) which extends along a main axis (X), and a base (6) which extends at a lower end of the body (5), the base (6) being provided with protruding feet (7) that are provided with crowns (11) which extend in a common setting-down plane (12), pairs of the feet (7) being separated by recessed grooves (15) which extend radially from a central region (8) of the base (6), each foot (7) having two flanks (17) that each laterally border a groove (15), characterized in that the flanks (17) of two adjacent feet (7) which border one and the same groove (15) form between one another, at the level of the setting-down plane (12) and in a plane transverse to the radial direction of extension of the groove (15), an obtuse angle (A) at the crown.

Description

There is the container of double-arc deformable bottom

Technical field

The container that the present invention relates to the plastic material utilizing blank (no matter this intermediate receptacle relating to preform or lived through preform pre-blowing operation) by blowing or stretch blow is as the field of bottle or kettle, container has main body, main body is continued by neck in upper end, carry out through described neck the filling of container and discharge, main body is continued by the bottom of closed container in bottom.

Background technology

Blowing operation and stretch blow operation are carried out in the mould with container die cavity, give material with certain rigidity, this rigidity stems from makes material simultaneously (be parallel to the general axis of mould or container) vertically and radially (perpendicular to described general axis) double orientation of standing.

But this rigidity is not enough to allow the container opposing internal stress that stands during its life cycle from filling of container and external carbuncle all the time.

Internal stress mainly comprises temperature or the pressure of content.

Knownly carry out thermal finalization (i.e. thermal crystallization) to increase the intensity of container resistance to deformation, the thermal stress stood when this distortion results from hot filling (being about 90 DEG C as pasteurization fruit juice or even tea for some beverages).But thermal finalization, in view of its cost is high, period is long, thus can not be generalized to more common application examples as without in carbonated drink.

Also known employing is called the special bottom shape bottom petal-shaped, it has protruding footing, the top of footing is defined for the setting plane of container, by dark trench separately, dark trench provides the compressive strength of the increase of pressure in the height caused by some contents of opposing (especially carbonated drink) to footing.But, in view of the degree of depth (this degree of depth is generally at least 50% of bottom overall diameter) of the complexity of its shape and trench thereof bottom petal-shaped, thus more material is needed, this kind of petal bottom is made to be not suitable for as the common application without carbonated drink, for this kind of common application, make every effort to by contrast reduce material usage as far as possible.

External carbuncle mainly comprises the axial compression stress that container that collet stows transport bears, and each container bears the weight of the container post above container.Even if the container of heat setting and/or the container had bottom petal-shaped generally can bear this stress well because its mechanical characteristics improves, but the container carrying out the common application as without carbonated drink compares and is difficult to bear this stress, when carrying out collet and stowing this container of transport, occur sometimes flattening phenomenon.

Known radial rib reinforces the bottom of this container, radial rib extends from the central area of bottom, through the setting plane that bottom is formed, exceed bottom range, see such as French Patent (FRP) FR2932458 (SIDEL) or its equivalent US Patent No. 2009/308835.What provide bottom this is functional, but still expects to improve its performance to reduce the danger be crushed to greatest extent, thus contributes to collet steadiness.Although it should be noted that only fluting may reinforce bottom but not necessarily good method, because it gives blowing, larger difficulty (in other words, which reducing the blow molding of container and the ability of correct blowmoulding plastic containers) is brought in bottom.

Summary of the invention

The first object of the present invention proposes a kind of container, and the bottom of this container has the mechanical characteristics of improvement under equivalent material, or have equivalent performance under quantity of material reduces.

The second object of the present invention proposes a kind of container, and the bottom of this container has the blow molding of improvement.

The third object of the present invention proposes a kind of container, and the bottom of this container makes it to have the better anti-mechanical strength axially flattened.

A kind of container of plastic material is proposed for this reason, it has main body and bottom, described main body extends along spindle axis, described bottom extends the lower end of main body, bottom is furnished with protruding footing, these footings are provided with top, these tops extend in a public setting plane, footing is separated by twos by the groove portion of caving in, groove portion extends from the central area radial direction of bottom, each footing has two sides, described two each side direction in side are in the edge in a groove portion, the side being in edge, same groove portion of two adjacent footings is each other at setting plane place, and blunt drift angle A is formed in the radial direction extended with groove portion is in horizontal plane.

Under axial compression, angle A trends towards opening, thus allows light axial compression bottom, causes the pressure increase of container contents, and thus makes container can have larger rigidity.

The following various different supplemental characteristics adopted alone or in combination can be set:

Blunt drift angle A between-side is between 90 ° to 150 °.

Blunt drift angle A between-side is about 120 °.

Outside the concave surface facing container of-each side.

-each groove portion to have between setting plane and the bottom land in groove portion perpendicular to the depth H measured by setting plane, makes:

$\frac{H}{D}\≤\frac{1}{10},$

Wherein, D is the full lateral dimension recorded at the joint of bottom and main body of bottom.

The degree of depth in-groove portion makes:

$\frac{H}{D}\≅\frac{1}{20}.$

-be in edge, same groove portion side with the parallel plane plane of setting in limit the lock angle aperture B recorded centered by the axis of main body, lock angle aperture B is greater than angle aperture C that the top of each footing limits, that record in setting plane centered by the axis of main body.

The lock angle aperture B of-side is such:

$\frac{B}{C}\≅2$

The bottom of-container has two concentric region, i.e. middle section and neighboring area, middle section and neighboring area are separated to stage by tween drive shaft, and described tween drive shaft extends ringwise continuously to stage, thus middle section relative to neighboring area to axial offset in container.

The prolongation of-groove portion exceedes setting plane and extends on the lateral wall of bottom.

Accompanying drawing explanation

According to reference to the accompanying drawings to embodiment description, of the present invention other object and advantage will be embodied, in accompanying drawing:

-Fig. 1 is the perspective bottom view of plastic material container;

-Fig. 2 is the real transparent view of magnification ratio, and the bottom of Fig. 1 container is shown; In order to understand the shape of bottom better, represent that the Curved of lower surface is wide with lines;

-Fig. 3 is the real face upwarding view of container;

-Fig. 4 is the part sectional view of container along section IV-IV of Fig. 3;

-Fig. 5 is lateral plan, with solid line illustrate there is no stress time container profile, the profile of container under axial compression stress shown in broken lines, concentrates on the thin portion of a part of being out of shape due to axial compression of bottom shown in square frame (m é daillon).

Detailed description of the invention

Container 1 shown in Fig. 1 is bottle here, and it utilizes the preform stretch blow of thermoplastic material to form, and described thermoplastic material is such as PET (poly é thylenet é r é phtalate, i.e. polyethylene terephthalate).This container 1 is for receiving without vapour content (especially without carbonated drink).

This container 1 has neck 2 in upper end, and neck is furnished with eck 3.In the extendible portion of neck 2, container 1 has convex shoulder 4 at an upper portion thereof, and convex shoulder expands along the direction contrary with neck 2 and extends, and this convex shoulder 4 is extended by sidewall or main body 5, and sidewall or main body are in the pivotal usual cylinder form of spindle axis X around container 1.

Container 1 also has bottom 6, the bottom of bottom autonomous agent 5, relatively extends with neck 2.With D indicate bottom 6 bottom this with the full lateral dimension of the joint of main body 5.When the profile of container 1 is circular, as in the embodiment shown, the full lateral dimension D of bottom 6 is equivalent to its overall diameter.

Bottom 6 is furnished with footing 7, these footings are formed by the reinforcement to container 1 outer lug, extend from the central area 8 of bottom 6, described central area 8 extends to container 1 sunken inside and comprises disk portion 9, disk portion results from the injection mo(u)lding to making container 1 preform used and carrying out, and it is unbodied substantially that material keeps in disk portion.

Each footing 7 has the lower surface 10 of the arch outside concave surface facing container 1.As shown in Figure 4, this lower surface 10 is comparatively to delay gradient (relative to the Transverse plane perpendicular to container axis X, this gradient is less than or equal to about 10 °) extend until top surface 11 from central area 8 radial direction, be called top more simply after top surface, form the most outshot of footing 7.The top 11 forming the most outshot of footing 7 extends in the public Transverse plane 12 being called setting plane, and container 1 is placed on a flat surfaces such as desk by this setting plane.

As filled top 11 as described in two by honeycomb-like pattern with visible in the Fig. 2 and 3 embodying its shape exterior feature well, top 11 has scalloped profile in setting plane 12, is connected to the lateral wall 13 of bottom by large radius chamfer 14.With C indicate limited by the top 11 of each footing 7, record in setting plane 12 and centered by axis X in isogonism aperture (Fig. 3).

As shown in Figures 2 and 3, bottom 6 is provided with the groove portion 15 of a series of depression, and groove portion extends from central area 8 radial direction, and groove portion makes footing 7 separate by twos.As seen in Figures 2 and 4, see that these groove portion 15 radial directions forming a kind of mulle extend beyond setting plane 12 from looking up angle (Fig. 3), each groove portion has outer end portion 16, and outer end portion 16 rises on the lateral wall 13 of bottom 6.For the purpose of clearer, in Fig. 2 and 3, fill a groove portion 15 with dashed pattern.In an illustrated embodiment, bottom 6 has seven groove portions 15 (and seven footings 7), but this quantity can less (at least three) or can more (such as many as 11 groove portions 15 and 11 footings 7).

In view of the height of footing 7 is low, thus bottom 6 can not be regarded as bottom a kind of petal-shaped.More precisely, as shown in Figure 4, each groove portion 15 to have between setting plane and the bottom land in groove portion 15 perpendicular to the depth H measured by setting plane 12, makes:

$\frac{H}{D}\≤\frac{1}{10}$

More precisely, in an illustrated embodiment, the ratio of H and D is:

$\frac{H}{D}\≅\frac{1}{20}$

Comparatively speaking, in bottom petal-shaped, trench vertically arrives the trench degree of depth of setting plane and is about less than 1/5 with the ratio of the full lateral dimension of bottom.

As shown in Figure 5, more particularly as shown in the square frame relevant to Fig. 5, each groove portion 15 is (in the plane paralleling to the axis X and the radius extended perpendicular to groove portion) in vertical section, there is the arch profile (in other words, exit skirt U-shaped profile) outside concave surface facing container 1.

Shown in Fig. 2 and 3, each footing 7 has two sides 17, and these two each side direction in side 17 are in the edge in a groove portion 15, so that belongs to respectively around two side 17 side direction of two adjacent footings 7 in this groove portion 15 along the edge in this groove portion 15.For the purpose of clearer, two sides 17 (groove portion 15 illustrates with dashed pattern itself) being positioned at both sides, same groove portion 15 are shown with dot pattern grey in figs 2 and 3.

As shown in Figure 5, especially as shown in its square frame, each other parallel to the axis in the plane of X at setting plane 12 place and in the radial direction extended transverse to groove portion 15 in two sides 17 at edge, same groove portion 15, form blunt drift angle A.

Preferably, the drift angle A between two sides 17 at edge, same groove portion 15 is between 90 ° to 150 °.A kind of preferred implementation with reference to the accompanying drawings, drift angle A is about 120 °.

Preferably, each side 17 is the spill outside concave surface facing container 1.As clearly visible in the square frame of Fig. 5, the radius of curvature of side 17 is much larger than the radius of curvature in groove portion 15.According to a kind of preferred implementation, the radius of curvature in groove portion 15 is less than 1/10 with the ratio of the radius of curvature of side 17, is especially about 1/15.Therefore, side 17 forms open discharging arch in the both sides in groove portion, and its effect will be set forth below.

Each side 17, by minor radius fillet, is connected to the top 11 of footing 7 on the one hand and is connected to groove portion 15 on the other hand.

In addition, as clearly visible in Fig. 2 and 3, each side 17 has a kind of arrow tail shape profile from the angle of looking up, expand from the some position that is positioned near central area 8 until widen middle body just to setting plane 12, then widen middle body narrow until be positioned at the some position of the lateral wall 13 of bottom 6 from this.

Two sides 17 being in edge, same groove portion 15 jointly limit lock angle aperture B (it is centered by axis X, records in setting plane 12 between the outward flange of the middle body of side 17) in the plane parallel with setting plane 12.Preferably, angle aperture B is greater than the angle aperture C that each top 11 limits.A preferred implementation with reference to the accompanying drawings, the ratio of the angle aperture C that angle aperture B and each top limit is:

$\frac{B}{C}\≅2$

As seen in FIG., especially as more clearly appreciiable in Fig. 2 and 3, the bottom 6 of container 1 also can be divided into two concentric region, namely around the annular central region 18 of the central area 8 of bottom 6 and the annular peripheral region 19 around middle section 18, they by annular stage 20 axially extended on predetermined altitude separately.This stage (d é crochement) 20 mediates relative to bottom 6, and that is, central annular region 18 and circumferential annular region 19 substantially have identical radial direction and extend size.

Stage 24 extends continuously, and namely stage is not interrupted at place of groove portion 15, but extends to the bottom land in groove portion, and stage is not also interrupted at footing 7 place, but straddles footing and extend, and comprises straddling its lower surface 10 and its side 17 extends.

At container 1 in around in the illustrated embodiment of the pivotal substantially cylindrical shape of its axis X, stage 24 forms the ring with circular contour.

Owing to there is axial stage 24, thus the middle section 18 of bottom 6 slightly offsets along short transverse relative to neighboring area 19 in container 1.

The effect of stage 24 is: by strengthening bottom this steadiness that 6 keep container 1 in the zone line of bottom.

The bottom 6 of structure like this has good blow molding (especially due to the large angle aperture A of side 17), gives container 1 to have better mechanical characteristics than the common vessel of equivalent material simultaneously.

In fact, under the effect of the axial compression that the neck 2 of the container 1 kept flat with its setting plane 12 is applied (in Fig. 5 shown in arrow), side 17 distortion is opened (namely opening described angle A), and the direction towards setting plane 12 becomes flat, as shown in the dotted line on the square frame of Fig. 5.

Thus cause bottom 6 to be slightly out of shape under axial compression, thus cause whole main body 5 towards the direction translation (body is not significantly out of shape, because body has the ring-segment-like structure of small curvature radius) of setting plane 12, as on Fig. 5 with shown in dotted line.

The effect of this structural strain's is the content supercharging making container 1, thus increases the rigidity of container 1, is conducive to the intensity of the anti-axial compression improving container.Therefore, bottom 6, is in general container 1, shows as Compress Spring, and its rigidity increases with the compressive force axially applied.

Stage 20 forms piston, can limit the axial deformation of bottom 6, and piston forms stroke limit block, and under the effect of large axial compression stress, stroke limit block engages with setting plane 12, thus increases the contact surface area of container and its supporting member.

Therefore, these advantages make to carry out collet and stow transfer cask 1, and do not make the serious risk that container deforms, thus can conveniently carry out collet stow carrying and boost productivity.

Claims (9)

1. the container (1) of a plastic material, container has main body (5) and bottom (6), described main body extends along spindle axis (X), described bottom extends the lower end of main body (5), bottom (6) is furnished with protruding footing (7), these footings are provided with top (11), these tops extend in a public setting plane (12), footing (7) is separated by twos by the groove portion (15) of caving in, groove portion extends from central area (8) radial direction of bottom (6), each footing (7) has two sides (17), described two each side direction in side are in the edge in a groove portion (15), it is characterized in that, the side (17) being in same groove portion (15) edge of adjacent two footings (7) is each other at setting plane (12) place, and blunt drift angle (A) is formed in the plane of the radial direction extended transverse to groove portion (15), each groove portion (15) has between setting plane and the bottom land of groove portion (15) perpendicular to the depth H measured by setting plane (12), make:

$\frac{H}{D}\≤\frac{1}{10},$

Wherein, D is the full lateral dimension recorded at the joint of bottom and main body (5) of bottom (6).

2. container according to claim 1 (1), is characterized in that, the blunt drift angle A between side (17) is between 90 ° to 150 °.

3. container according to claim 2 (1), is characterized in that, the blunt drift angle A between side (17) is about 120 °.

4. according to container in any one of the preceding claims wherein (1), it is characterized in that, the concave surface facing container (1) of each side (17) outward.

5. according to container in any one of the preceding claims wherein (1), it is characterized in that, the degree of depth of groove portion (15) makes:

$\frac{H}{D}\≅\frac{1}{20}.$

6. according to container in any one of the preceding claims wherein (1), it is characterized in that, the side (17) being in same groove portion (15) edge limits the lock angle aperture B recorded centered by the spindle axis of main body (5) (X) in the plane parallel with setting plane (12), and lock angle aperture B is greater than angle aperture C that the top (11) of each footing (7) limits, that record in setting plane (12) centered by the spindle axis of main body (5) (X).

7. container according to claim 7 (1), is characterized in that, the lock angle aperture B of side (17) makes:

$\frac{B}{C}\≅2.$

8. according to container in any one of the preceding claims wherein (1), it is characterized in that, the bottom (6) of container has two concentric region, i.e. middle section (18) and neighboring area (19), middle section and neighboring area are by tween drive shaft to stage (20) separately, described tween drive shaft extends ringwise continuously to stage, thus middle section (18) relative to neighboring area (19) to container (1) interior axial offset.

9. according to container in any one of the preceding claims wherein (1), it is characterized in that, groove portion (15) prolongation exceedes setting plane (12) and extends on the lateral wall (13) of bottom.