DE2910609A1 - Parison for repeated use bottle - designed with specified cross=section and diameter to length ratio - Google Patents

Abstract

A parison for the blow moulding of bottles for repeated use, contg. carbonated beverages, made of transparent plastic such as polyethylene terephthalate has a throat angle of 3-45 degrees and a max. cross-section of the rump of 5-9 cm2. The normal outside rump dia. is 40 to 50 mm and the ratio of dia. to length is 1:3 to 1:4.5. Such a parison contains more material than conventional types. This material is distributed in such a way that the transparency is not impaired and the bottle has enough stability for repeated use.

Description

Patent application D 5891

"Preform for producing a transparent hollow body" . ·

The invention relates to a preform for producing, in particular, bubbles, a transparent, reusable hollow body, for example a returnable bottle for carbonated beverages, preferably made of thermoplastic polyester based on polyethylene terephthalate (PETP) with walls corresponding to an iv value of ~ 1.0 , consisting of a tubular body closed at one end, the open end of which has a shape that is essentially finally adapted to the intended hollow body closure and, in a transition zone representing the neck, gradually increasing wall thickness merges into a body with approximately constant wall thickness over its length, whereby a preform cap is continuously connected to the end of the body opposite the neck.

It has already been proposed to use polyethylene terephthalate (PETP) with iv values (iv = intrinsic viscosity) of preferably Si 1.0 in the thermoelastic

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030039/0319

Patent application ^; · '' -. ".. ' : - ·' United ^ rpacicungs-D 5891 2 Gesellschaft mbH

Area stretched at temperatures between 80 and 110 ° Manufacture bottles with crystal clear walls that are sufficiently stable for use as returnable bottles and have strong walls, floors, etc., Such views can have filling volumes of 0.5 1 upwards, preferably between 1 \ ind 2 1.

A preform, injection molding or parison similar to that The type mentioned above is from DE-OS έ 8i4 952 . known. This also made of a polyethylene terephthalate polymer existing preform is intended for the manufacture of an aerosol bottle. The well-known preform is to be produced in a form having a core pin, in which the beaded edge bead is later made the preform to be formed bottle already receives its final dimensions. On the beaded edge of the well-known The preform is followed by a neck of steadily increasing wall thickness, which then ends up in the body transforms. The latter has essentially constant wall thickness and is on the opposite of the later closure Longitudinal end by a continuously connecting one

Molded cap completed. The body of the known A'or-) molding has a smaller cross-section than the closure end with a flanged edge, which is already final in its shape. From the information in the acquaintance it can be seen that the cross-section of the trunk is a maximum of about 3 cm ² . Due to the limited wall thickness of the preform in terms of manufacturing, only bottles of relatively small volume can be produced in this way by blowing, or the larger-volume bottles formed have such a small wall thickness that, due to the deformation behavior, use as a returnable bottle is out of the question.

030039/0319

Ί Λ! ·· ': ;;: 2310609

Patent application '' United Packaging

_D rßq- | 3 Gesellschaft mbH

The invention is based on the object of creating a preform for the production of relatively large-volume returnable bottles with a clear, transparent wall. The preform should therefore have more than a previous body of this type. But the material is to be selectively distributed so that it is without the expense of unnecessarily increasing and reducing the transparency of the final hollow body to be distributed so that the hollow body is given an adequate for repeated use r 10 stability.

In the case of a preform of the type mentioned at the outset, the inventive solution to this problem consists in that at one is the increase in wall thickness in the area of the neck characteristic wall thickness opening angle of about 3 up to ^ 5 is the maximum cross-section of the fuselage produced by pressing, Casting and / or injection molded preforms about

2
5 to 9 cm, the maximum fuselage outside diameter is about ^ 0 to 50 mm and the ratio of trunk diameter to trunk length is about 1: 3 to about 1: 4.5.

The preform according to the invention is cfemem in principle a tubular body closed at one end, whose open end than for all common types of closure, such as screw closure, snap closure or clinch closure, already finally finished hollow body mouth is formed. If necessary, a screw cap can be used be equipped with or without theft protection (Pilfer-Proof-Ring). As a support and / or Carrying aid, it can also be advantageous to place the mouth area below the closure - between the pre-closure and neck - to be designed in the form of a plate even with the preform.

030039/0319

Patent application ■ United packaging

D 5B91 ^ Gesellschaft mbH

The body of the preform, injection molding or parison has '. according to the invention an outer diameter at least as large as the open end of the tubular body, which is finally shaped as a hollow body opening. In spite of the greater mass contained in the fuselage than before, the wall thickness required compared to known preforms; not to be significantly changed. The usual problems | a transparency that is always reduced if the wall thickness is too great does not occur. 'i {

The body of the preform according to the invention is as usual! lent the main carrier of the for further processing ' required material. Accordingly, opposite ·; the preform cross-section in the muzzle zone is subject to a strong cross-section change towards the fuselage. the end

Manufacturing and processing technology point of view V

However, this change must not be sudden, but A should take place smoothly. According to the invention, among other things, the increase in wall thickness in the area of the neck defined between the closure and the hull is to be kept smaller, the greater the cross-sectional difference between the closure and the (finished) hull is supposed to be. The limits for the corresponding opening vinyl;

Is the wall thickness ran generally between 3 j

and h ^>, but preferably between about 7 and 15 · Bei;, '? With a sufficiently small opening angle of the wall thickness, it is';'not essential whether the beginning and end of the neck of the.' Külbels-forming transition zone is angular or rounded.

Following the neck of the preform according to the invention follows - as I said - the Rxa-npf. This can be used as a

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030039/0319

Patent application ^D 5891

-United

approved sales

^D 5891 5 Gesellschaft mbH

cylindrical or slightly ionically tapering tube section from the neck. The conicity should generally not be greater than 2 °. The cross section of the body of the preform according to the invention

; 5 should have a maximum of about 5 to 9 cm j preferably

6 to 7 cm. The fuselage outside diameter is

; then carries a maximum of et \ * a kS mm. With known preform

! length of a similar shape made of PETP is the maximum transverse

■ 2

: cut in the fuselage at approx. 3 cm.

I ί ■ 10 To the end of the fuselage opposite the lock ϊ is continuously followed by a so-called preform cap. .

I This can be a flat dome with small transition radii

\ be designed to the fuselage; with a length

ΐ bordering Külbel, this variant offers the possibility of

i 15 to accommodate a maximum amount of material. As a pre

; molded cap can also be provided with a ball point,

which are favorable conditions with regard to the amount of material and, in many cases, the manufacture of the preform

indicates. · In the latter respect, offers an elliptical

20 dome as a preform cap, significant advantages regarding i
\ the manufacturing and processing. Can be advantageous here

be a more appropriate in the center of the dome knobs, the ER a simple judging) quality of the manufactured article from the parison during further processing

;: 25 leaves. There. the center of the preform cap during manufacture,

In particular, bubbles, the hollow body to be formed is less stretched than the corresponding edge areas, for reasons of material savings and transparency it is advisable to make the wall thickness of the preform cap up to 30 ? <> Less in its center than in the area adjacent to the fuselage .

u 0 3 0 0 3 9/0319

Patent application D 5891

United packaging company mbH

Further details of the invention are given with the aid of the schematic representation of exemplary embodiments explained. Show it:

Fig. 1 is an overall view, partially in cross-section, of the preform;

FIG. 2 shows a closure of the preform that is modified compared to FIG. 1:

FIG. 3 shows different alternatives of Vandstärkezunahme and H ^ _m area of the neck of the preform; and

5 variants of the design of the preform cap. to 7

The preform, injection molded part or parison according to FIG. 1 can in principle be thought of as being composed of four longitudinal sections. The first longitudinal section is the mouth 1, also shown in FIG. 2, which should have a shape that is finally adapted to the intended hollow body closure. The mouth is followed by the neck 2, in the area of which the wall thickness of the preform increases to the amount required for the third area, namely the body 3. The preform cap k continuously adjoins the body 3. This can according to FIG. 1 as a spherical dome with everywhere uniform wall thickness, as a flat tip as shown in FIG. 5 as an elliptical dome in accordance with Figure 6 and / or FIG. 7 k as a dome with the hull for lying in the center knobs 5 decreasing towards ¥ and strength be formed. In Fig. 7, the wall thickness in the center of the preform cap is h with d ^ and in the area

K.

of the fuselage 3 denoted _{by d p.}

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030039/031 9

Patent application '"* United packaging

D 5891 7 Gesellschaft mbH

Among other things, the second is essential according to the invention Longitudinal section (llals 2) of the preform. The neck 2 closes directly according to FIG. 1 or via a TeD.ler 6 according to FIG. 2 to the one in the exemplary embodiment as a screw closure mouth 1 shown. In the mouth area there are outside diameters between about 30 and 40 mm, one maximum height of about 35 mm and a plate diameter of a maximum of about 60 mm is expedient.

The change in cross section and change in wall thickness in the area of the neck 2 can be on the outside of the preform as well as on the inside thereof. In Fig. 1 the case is shown that

of the preform clearance in mouth 1, neck 2 and body 3 is the same and the three parts 1 to 3 merge flush with one another. The outside diameter increases by the Wall thickness opening angle a to. In contrast, Fig. 3 shows the case that the mouth 1, the neck 2 and the Fuselage 3 is essentially smooth on the outside Form cylinders, while the inner diameter in the region of the neck 2 corresponds to the extent of the opening angle a decreases. It should be noted that the increase in wall thickness in the area of the neck approximately in accordance with Fig. ^ Airch on the outside and inside at the same time can be done. According to FIG. 4, the opening angles a add up on the outside and a_ on the inside to the total opening angle a.

The body 3 of the preform according to the invention is disregarded of a possible cross-section through the angle b in the amount of at most 2 according to Fig.

030039/0319 j

Patent application ¹ · ^: '..' · .. ■ ·: ·· Vereinigte Verpaokungs-D 5891 8 Gesellschaft mbH

would be essentially cylindrical from the border of the neck 2 to the border of the preform cap k. The ratio of trunk diameter D to trunk length L should be approximately between 1: 3 and 1: k.5 .

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030039/0319

: ■ till ti ti

Patent application 9 United Packaging D 589 'gesei !schaft mbH

; -.,: List of symbols

I Ί = mouth

I 2 = neck 1 | ■ 3 = trunk

r ¹ ; 4 = preform cap

U 5 = knobs

^ 6 = plate

II a = wall thickness opening angle in the area of the neck 2 || b = angle of conicity in the area of the fuselage 3

(I D = outer diameter of the fuselage 3

= ί ^; I »= body length between neck 2 and preform cap 4

030039/0319

Claims (1)

D 5891 ¹ Gesellschaft mbH j "preform for producing a transparent hollow j body " V claims '/ j (1y preform for making, especially bubbles, It 5 of a transparent, reusable hollow body, \ ■ ' for example a reusable bottle for carbonated f ^; ; Beverages, preferably made of thermoplastic polyester U based on polyethylene terephthalate (PETP) with ['! corresponding to an IV value = 1.0 crystal clear, transparent fi; 10 rentev. Walls, consisting of a t) closed, tubular body, its open end ;; one to the intended hollow body closure essentially 5> borrowed finally adapted form and in one of the . ' Neck representing the transition zone gradually increasing / 15 Wall thickness in a fuselage with roughly the same length ■ constant wall thickness merges, with the neck : the opposite end of the body is continuously connected to a preform cap, characterized in that at an opening angle (a) of about 3 to U $ of the U maximum body cross-section of a maximum body cross-section of a pressing, to water '?.;' and / or injection molded preforms about 5 to 9 cm, the maximum fuselage outside diameter (d) about 40 to 50 mm and the ratio of the fuselage outside diameter; 25 (d) to torso length (l) is about 1: 3 to about 1: h.5 . 2. Preform according to claim 1, characterized in that the through the area between the neck (2) and . the preform cap (h) defined body (3) approximately cylindrical i is shaped drisch. 030039/0319 Patent application D 5S91 United packaging company mbH 3 · Vox "molding according to claim 1, characterized in that that the body (3) defined by the area between the neck (2) and the preform cap (4) beginning with a maximum diameter following the neck (2) a conically gradually tapering shape, in particular with a Konizxtätswinkel (b) of up to about 2 (Fig. 4). 4. Preform according to one or more of claims 1 to 3> characterized in that the preform cap (4) as a flat, substantially rectangular in the Fuselage is formed dome (Fig. 5) 5 · Preform according to one or more of the claims 1 to 4, characterized in that a knob (5) is provided in the center of the preform cap (4). 6. Preform according to one or more of claims 1 to 5, characterized in that the wall thickness (d _K ) in the center of the preform cap (4) is up to 30 ^c /> less than that (d _p ) immediately adjacent to the body ( 3) is (Fig. 7). 7 · Preform according to one or more of the claims 1 to 6, characterized in that the increase in wall thickness in the area of the neck (2), in particular between about 7 and 15, the opening angle (a) is the smaller, the larger the Difference in the cross-sections of the neck (2) and trunk (3) are to be selected. / 3 030039/0319 Patent application United Packaging D 5891 3 Gesellschaft mbH 8. Preform according to one or more of claims 1 to 7> characterized in that the maximum The cross-section of the trunk is between 6 and 7 cm. 9 · Preform according to one or more of the claims 1 to 8, characterized in that the maximum fuselage outside diameter (d) is approximately 46 mm. 10. Preform according to one or more of claims ·; (1 to 9) characterized in that the mouth (i) in the form required to produce a screw, snap or clinch closure, in particular with anti-theft ring, is formed. 11. Preform according to one or more of the claims 1 to 10, characterized in that between the closure zone of the mouth (i) and the neck (2) a plate-shaped Collar (6) is formed as a support and / or carrying aid. 12. Preform according to one or more of claims 1 to 11, characterized in that the outer diameter "diameter of the mouth (1) between about 30 and HO mm and the maximum height of the mouth (1) measured perpendicular to the diameter be up to about 35 mm. ) 3 · Preform according to claim 11, characterized in that that the diameter of the plate-shaped collar (6) is approximately a maximum of 60 mm. / h 030039/0319 Patent application 2S10609 United Packaging Society mbH 14. Preform according to one or more of claims 1 to 13 j, characterized in that the increase in
Wall thickness in? Area of the neck (s) entirely on the outside of the neck (Fig. 1), entirely on the inside of the shark (Fig. Or partly on the outside and partly on the
Inside (Fig. 4) is provided. 10 15 · Preform according to one or more of claims 1 to 1U, characterized in that the closure-side and / or the body-side end of the neck (2) marked by the wall thickness increased in the longitudinal direction of the preform rounded into the neighboring area
(1, 3) passes over. 030039/0319