ES2644249T3 - Retractable blow molded plastic thin wall container - Google Patents

Description

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5

fifteen

25

35

Four. Five

55

65

below in the dispensing unit for home and office delivery (HOD) as shown in Figure 5A.

This thin-walled bottle (1) is composed, from the top to the base, of the following parts:

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one neck end (2),

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a neck support ring (3),

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a neck (4),

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a flange joint (5) comprising a recoil starter (51), which is a rib in this example (see Figures 1A, 2-,

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a portion of tubular body (6) that is printed with several continuous transverse grooves (61) and with several collapsing / folding initiators (62) located in the grooves (61),

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and an integral lower structure (7) that includes:

- a curved terminal portion (8)

- a terminal retractable projection extended axially outward (9)

- and at least one recoil starter (71) that joins the terminal curved portion (8) with the projection (9), and which is a groove in this example (see Figures 1A, 1A ’, 1B-.

In the thin-walled bottle (1) shown in the attached drawings, the end of the neck (2) is threaded to receive a screw cap 2 ’as shown in Figures 5C; 5J; 6A; 6B. In a variant, the cover 2 ’can be a cover that is adjusted by force on an adapted neck finish composed of a neck end (2) and a neck support ring (3). Classically, the bottom of the screw cap 2 ’is attached to a tamper-proof ring that rests on the neck support ring (3) that separates the end of the neck (2) and the neck (4).

The rib (51) of the flange (5) acting as a retraction initiator of the upper part of the thin-walled bottle (1) is shown in detail in Figure 2. Said rib (51) behaves as a reinforcement that makes it possible to push the upper part of the flange (5) and the end of the neck (2), when a downward force is applied on the end of the neck (2) and / or when an upward force is applied on the bottom ( 7) of the thin-walled bottle (1). The retraction of the upper part of the flange (5) together with the end of the neck (2) of a thin-walled bottle (1) filled with water and stacked according to the invention is shown in Figure 6B.

The width of the rib (51) is, for example, between 1-30 mm, preferably between 7-20 mm, more preferably equal to about 12 mm.

The height of the rib (51) is, for example, between 0.5-20 mm, preferably between 2-10 mm, more preferably equal to about 6 mm.

The tubular body portion (6) is printed with, for example, 9 continuous transverse grooves (61), each of which comprises 4 or 6 collapsing / folding initiators (62), which are angularly offset about the axis.

In the embodiment shown in the attached figures, especially in Figure 1A ’, the slots (61) of the thin-walled bottle (1) each cross section have a V-shape, and more particularly two coplanar edges

(58)

and an intermediate part between the two edges (58), said intermediate part having a vertex (56) displaced inwards with respect to the two edges. The latter are two straight branches (58) of the V-shape connected by circular arcs 60 to the substantially cylindrical side wall of the thin-walled bottle (1). Each slot (61) has a width (w) measured between the two edges and a maximum height (h) measured between the edges and the apex. In this embodiment, each slot (61) includes collapsing initiators (62) that are legs angularly evenly distributed around the longitudinal axis (64) of the bottle (1) and protruding outwardly from the bottoms of the slots (61) . Said slots (61) are of constant height h apart from the collapsing initiators (62). The shape of the folding initiators (62) can be defined as follows. In the plan view of Figures 1C and 1D (variant), they are respectively curved and circumflexed, with an apex protruding outward. Each initiator

(62)

It has an average plane of symmetry (66) that includes the axis (64) of the bottle (1). The middle planes 66 of two consecutive collapsing initiators in the same slot (61) form an angle between them of 2.π / n, where n is the number of collapsing initiators (62) per groove (61). The angular extent ε of each collapsing initiator (62) around the axis of the bottle (64) is in the range of approximately 0.2 radians at 2.π / n; in its middle plane of symmetry (66) that includes the axis of the bottle, each collapsing initiator (62) is defined by a generatrix or crest line (68) that extends between the two branches (58) of the groove ( 62) and which is connected to one of said branches by a circular arc 70 whose concave side faces outwards and has a radius located in the range of approximately 0.5 mm with respect to the radius of the circular arc tangent to the generating line 68 , and to the branch (58) of the groove; the generating line or crest line (68) is a straight line connected to the other flank (58) of the groove through a rounded portion (72) of minimum radius of curvature, the connecting line being curved in a plane perpendicular to the bottle shaft; the generating line or crest line (68) is inclined relative to the longitudinal axis (64) of the bottle (1) by an angle and in the range of 0 to about 45 °; and the radial extension λ of the collapsing initiator (62) in the middle plane (74) of the groove (61) is substantially equal or

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The method of manufacturing blow molding of the thin-walled bottle / jar (1) as defined above can be illustrated by the example as follows.

20 liter bottles (1) as defined above are manufactured by injection and blown with a standard 5 blow molding device, including an aluminum shell mold with an IR oven consisting of 3 ovens and a tree.

The thermoplastic raw material is a NOVAPET W170 PET resin and a VORIDIAN Xtreme PET resin. The intrinsic viscosity of these PET (IV) = 0.74 dl / g.

10 The heating and pre-blowing conditioning stages B are implemented. The parameters of this example are given below:

• Blowing parameters:

- Furnace power% 15

oven 1 oven 2 oven 3 0% 75% 100% 0% 0% 0% 0% 55% 45% 0% 0% 0% 0% 45% 50% 0% 0% 0% 0% 45% 50% 0% 5% 5% 0% 45% 42.5% 0% 0% 0%

- tree diameter: 16 mm

-speed: 1.9 m / s

- flow control: 22% 20 - For blowing: 150 mm opening / closing: 362 mm

The dimensions of the preform and the bottles are as follows:

Preform (injection stage A)

Thin-walled bottle (blow stage C)

Average diameter (mm)

35.65 209

Height without neck finish (mm)

112 350

Total Weight (g)

55.43 55.43

Neck Weight (g)

4.48 4.48

Body weight (g)

50.95 50.95

25 Bottles look good after blowing

The thickness distribution (Tmedia) of the bottles is indicated in Figure 3

The stretch ratios of the thin-walled bottle (1) in the example are as follows:

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 hoop stretch ratio: 209 / 35.65 = 5.86

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 axial stretch ratio: 3.95

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 total stretch ratio: 23.15

35 The method of bottling a liquid in that of the thin-walled bottle (1) as defined above, is to fill the thin-walled bottle (1) with a liquid (for example, water) in the bottling line, wherein the thin-walled bottle is subjected to pressure by means of the filled liquid (for example, water) which gives the thin-walled bottle (1) a mechanical resistance to deformation.

40 Conventional bottling lines can be adapted to this bottling method.

The method for packaging in view of storage and transport of thin-walled bottles (1) as defined above, essentially consists in taking advantage of the fact that the upper part of the flange (5) together with the neck (4) and the neck end (2, 3) and the bottom of the integral bottom structure (7)

45 of the thin-walled bottle (1), are retractable under the effect of coaxial forces.

Therefore, it is possible to stack the bottles filled with water (1), closed with screw caps (2 ’), which are resistant to

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Claims (1)

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