DD147652A1 - FORMULA FOR THE PRODUCTION OF TUBE-FAST PACKAGING - Google Patents

Abstract

The invention relates to a forming shoulder for the production of hose-shaped packages with rectangular cross-section and rounded edges or with circular cross-section, in particular for tubular bag-form-filling-sealing machines. The aim of the invention is a wrinkle-free as possible forming of packaging material, including coated papers, hose-like packaging. The invention solves the problem of the forming height even at large inlet angles r & ind1! to be kept within practically acceptable limits and to achieve sufficiently large deformation angles ksi in the vicinity of the seam-forming organs. According to the invention, the object is achieved in that the tips of the four conical surface areas from which the forming shoulder i.a. and which are usually in mirror image symmetry in pairs, are outside the cross section. In a preferred embodiment, the tips are located infinitely far from the cross section, i. the Beruehrungslinien a Kegelmantelflaeche with the adjacent flat surfaces are parallel to each other.

Description

21753 1-1-

Int. Cl. B 65 B 9/00

Form shoulder for the production of tubular packaging

Field of application of the invention

The invention relates to a forming shoulder for the production of tubular packaging with a rectangular cross-section and rounded edges or with a circular cross-section, in particular for tubular bag form-flap sealing machines.

Characteristic of the known technical solutions

According to Mot, Jr. E. (On the Form Shoulder Problem on Form-FUll Sealing Machines, Verpakking Rotterdam, 23/1971/10, pp. 570-577) and Arapov, AN (On the Theory of Construction of Form Shoulders _t Packaging Machines I ₁ Kaunas , 1972, pp 69-72) are design proposals for form shoulders with quasi rectangular cross section known. In both authors, the shoulder part is produced by a conical shell or two cone shells, the tips of which lie within the cross section of the cylinder part of the forming shoulder. With these constructions, large forming heights, which are indispensable for practical implementations, result for the desired large entry angles f ^ i for the possible wrinkle-free reshaping of coated papers. Nor do they offer any possibility of producing the so-called

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Bennaht, because the forming angles % in the vicinity of the seaming elements drop to values that are only slightly above zero rad (0 °).

Object of the invention

The aim of the invention is a wrinkle-free as possible forming of packaging material, including coated papers, tubular packaging ·

Explanation of the essence of the invention

The invention solves the problem of keeping the forming height in practically acceptable limits even with large inlet angles X * and to achieve sufficiently large forming angles in the vicinity of the seam forming organs.

According to the invention the object is achieved in that the tips of the four conical surface areas from which the forming shoulder i · a. exists and usually for reasons of symmetry in pairs mirror images of _s are outside of the cross section · In a preferred embodiment, the peaks are infinitely far away from the cross section, d · h · the BerUhrungslinien a conical surface with the adjacent flat surfaces parallel to each other.

This design of the forming shoulder makes it possible to keep the forming height sufficiently small even with large entry angles X * .

embodiment

In the drawings show:

Fig. 1: a complete form shoulder according to the invention, Fig. 2: the projection of a forming shoulder for

a substantially rectangular cross-section, Fig. 3 1, the projection of a forming shoulder: for a circular cross-section.

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In each figure, the tips of the conical surface have a different distance from the cross section · In each case in the left half of the drawing, this distance is infinitely large.

Each form shoulder consists of the shoulder and the cylinder part. In the drawings, the shoulder is formed from the flat surfaces I to III and the conical surface areas therebetween. Shoulder and cylinder parts are common - along the forming line contiguous - unwound in the plane. All longitudinally parallel imaginary fibers of the packaging material go back the same way during the forming process.

For the statements were determined:

Entry angle T ₁ = 90 °

Opening angle oi = 90 °

Deflection angle X = 45 °

Bag width B «11.5 cm

With these values were calculated:

Cross-section forming height cm cross-sectional area cm)

circular 20.11 42.1

almost rectangular 21.92 36.0

Depending on the choice of the angle λ, the angle of inclination of the anterior shoulder surfaces reaches 15 ... 30 ° (about 15 ° in the example), which is large enough to make organs for fin seam formation.

With comparable forming height remains in the previously known versions of the inlet angle T- significantly below 90 °, approximately in the order of 60 °.

From the comparison alone, the inlet angle of the advantage of the embodiment of the invention is clear. It can also be strong creasing tipping packaging such. As coated papers are processed largely trouble-free.

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With an infinite distance of the conical-shell tips from the cross-section, which has also been made possible by the invention, the production of the forming shoulder is substantially facilitated.

Claims (2)

21753 1 Invention claim 1 · Form shoulder with rectangular cross section and rounded edges or · with circular cross section, in which the shoulder part several cone shells alternating with flat surfaces, characterized in that the tips of the preferably four conical surfaces, of which i «a« for reasons of symmetry two mirror images are the same, outside the cross section. 2 · Form shoulder according to item 1, characterized in that the tips are infinitely far away from the cross section · H! Erzu_ £? L-sides drawings