FR2628837A1 - Liquid or paste filled sachet bursting measuring appts. - uses two plates with one fixed and one adjustable, with fixed plate connected to pressure measuring device - Google Patents

Abstract

The appts. has two parallel plates (5,6) which define an interface designed to receive the sachet (18) whose bursting pressure is to be measured. The sachet is placed between the two places (5,6) which can be displaced w.r.t. each other. The first plate (5) is the pressure transmission plate which is acted on by a motorised screw (11). The pressure exerted by the plate (5) is transferred to the other plate (6) via the sachet. The second plate resists the applied force and presses against a pressure compression force applied to the sachet. ADVANTAGE - Enables person sending sachet as parcel whether it can withstand rigours of postage.

Description

() FRENCH REPUBLIC Publication no .: 2,628,837 (to be used only

  for NATIONAL INSTITUTE reproduction orders)

INDUSTRIAL PROPERTY

  D National registration number 88 03563 PARIS

() Int C14: G 01 N 3/10.

@ A1 PATENT APPLICATION

  Filing date: March 18, 1988. Q Applicant (s) Public limited company known as: MECAPLAN. -

FR. ) Priority:

  (Inventor (s): Christian Planchard.

    Date of public availability of the

  application: BOPI "Patents" n 38 of September 22, 1989.

  References to other national documents appearing

rented: rt Holder (s):

(Agent (s): Propi Conseils.

  È Device for measuring pressure resistance of various objects.

  () Apparatus for measuring pressure resistance

  in particular to measure the burst pressure of an envelope. -

  flexible pad, such as a sachet containing a liquid - or pasty product, and the apparatus is characterized in that it consists of two parallel plates 5, 6 defining an interface capable of receiving the sachet 18 subjected to the measurement and set up between the two plates, which are designed to be displaceable one. T., '5 relative to the other, a first pressure transmission plate 5 receiving the thrust from a motor member such as a 6i_, I, /,' l cylinder 11, the thrust exerted by the plate being carried over by _ _ !: i, the sachet on the opposite tray 6 which resists the thrust, M

  I being supported by a force sensor 9 capable of measuring said -

  thrust and compression force undergone by the sachet in

intermediate position.

  0N L0 D Sale of flyersl NATIONAL PRINTER, 27, rue de la Convention75732 PARIS CEDEX 15 o DVend fascicles to the NATIONAL PRINT, 27. rue de la Convention -75732 PARIS CEDEX 15 1i 2628837 1 The present invention relates to a device of the "compressiometer" type and to measure resistance

  offered to pressure by various objects.

  The invention relates in particular to a device of reduced size making it possible to measure the resistance offered by articles of small dimensions but intended to be

  routed for example by post or courier.

  Items of this type must be checked at departure to ensure that they are able to withstand severe conditions of transport without the risk of bursting or

of destruction.

  The invention relates more particularly to an apparatus intended for measuring the resistance to bursting under accidental pressure, of sachets or envelopes of flexible material such as a synthetic film or a synthetic complex and containing products in the liquid state or pasty. And it is in connection with this application that the invention will be described more particularly below, although it

  is not specifically limited to this use.

  We know the bags made of two sheets of synthetic material, laminated by their edges, and whose intermediate space located in the center between the two sheets, is capable of containing a product in the form

liquid, viscous or pasty.

  Such products are used to constitute single-use doses in particular in the field of cleaning products, detergents, household products and more especially still in the field of cosmetics and perfumery; is

2 2628837

  1 that each sachet corresponds to a dose for a single use, that is to say that the sachet is conveyed in order to constitute

a free sample.

  In the case of the sample, the latter may be sent by post or by courier, in particular by press courier, being inserted in a magazine, a

review, etc ...

  It is clear that the sachet must present particularly precise physical conditions of resistance and determined so as not to risk, during the journey and transport, a burst as a result of which the liquid or viscous product would spread, thereby polluting the

neighboring objects.

  To this end, the invention relates to an apparatus making it possible to renew the possibilities of tests and verifications of

such sachets.

  We understand that these bags are shipped in large numbers, it is necessary that the device can operate at extremely fast rates, otherwise the verification phase would constitute in production a bottleneck, unless multiplied control stations by increasing then singularly

cost prices.

  To this end, the invention relates to an apparatus for measuring the resistance to pressure, in particular for measuring the burst pressure of a flexible envelope, such as a sachet containing a liquid or pasty product, and the apparatus is characterized in that it consists of two parallel plates defining an interface capable of receiving the sachet subjected to the measurement and placed between

3 2628837

  1 the two plates, which are designed to be movable relative to each other, a first pressure transmission plate receiving the thrust from a motor member such as a jack, the thrust exerted by the plate being transferred by the sachet on the opposite plate which resists the thrust being supported on a force sensor able to measure said thrust and the compression force undergone by

  the bag in the intermediate position.

  More particularly and preferably the two plates are arranged horizontally and comprise an upper plate movable downwards, against a second

  plateau qui.repose on said force sensor.

  In particular the upper plate is associated with a hydraulic cylinder arranged perpendicularly and above said upper plate, the hydraulic cylinder being supplied by a hydraulic pump located in the immediate vicinity and at

  which the cylinder is connected by a flexible pipe.

  More specifically, the apparatus comprises a fixed base or base, on which a plurality of columns are mounted integral, successively passing through the two parallel plates, slidably mounted on said columns, which join on the side opposite the base a fixed plate integral with said columns , the plate serving as support for the thrust member, such as a jack, ensuring the

  displacement of one of the two parallel plates.

  Thus and according to one embodiment, two trays of quadrangular shape are provided, mounted to slide, perpendicular to their plane, on four vertical columns, secured respectively to a base or lower base and to an upper plate, the two plates being mounted displacement relative to each other in

4 2628837

  1 a vertical movement remaining parallel to themselves.

  The plates are more particularly mounted on said columns by guide members such as bearing or

ball guide.

  There is also provision for the use of a hydraulic pump, capable of controlling the jack ensuring the displacement of one of the plates relative to the other, the supply of the jack from the pump being controlled by means of a control valve itself subjected to an operation by

pedal.

  According to yet another characteristic, the plate, opposite the plate moved by the jack, rests on a force sensor itself trapped between said plate and the fixed base. And preferably the force sensor is connected to a

digital display device.

  According to another characteristic, one of the two plates, preferably the lower plate, comprises a horizontally sliding drawer enabling the object to be engaged and released, such as a bag, subjected to the pressure measurement. According to yet another characteristic, the digital display device is provided of the peak memory type and optionally according to a development of the invention, the assembly is associated with devices for placing and automatically removing the sachets on the lower tray. , the movement of arrival and withdrawal of each sachet being slaved to the movements of raising, then lowering of the upper plate of transmission

pressure.

2628837

  1 Other characteristics and advantages of the invention

  will emerge from the description which follows and which is given

  in connection with an embodiment presented by way of nonlimiting example and with reference to the accompanying drawings. The single figure represents a schematic front elevation view of a compression tester or

  compression resistance measurement according to the invention.

  We see that the device comprises a fixed frame consisting essentially of a lower base 1 connected to an upper plate 2 by a set of four columns 3,4, each arranged at an angle from the base 1 and the

plate 2 of quadrangular shape.

  Two movable plates 5 and 6 respectively are slidably mounted by means of guide members with

  7.7 'and 8.8' ball, on columns 3 and 4.

  The lower plate 6 rests on a force sensor 9 while the upper plate is connected to the piston 10 of a

hydraulic cylinder 11.

  -The hydraulic cylinder 11 is connected by the pipe 14 to the hydraulic pump 13 itself driven by a motor by

  example a pneumatic or electric motor.

  The connection from the pump 13 to the jack 11 passes through a regulating valve operated by a pedal device consequently making it possible to press the jack 11, to maintain the pressure at a determined value and conversely to release the pressure of the jack; in the case where the jack is a single-acting jack, which will be the simplest embodiment, the raising of the plate, in

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  - 1 end of operation, will be obtained by a return spring

(not shown).

  A digital display device 16 rests in the upper part on the plate 2 and therefore allows instantaneous monitoring of the measured values. Preferably the assembly, between the upper plate and the base is associated with a transparent protective casing, for example of synthetic material in order to avoid any

  projection towards the outside in the event of bursting.

  It can also be seen that the lower plate 6 comprises substantially in its middle a removable plate 17 forming a drawer mounted to slide horizontally in the plate 6 and consequently making it easier to ensure the positioning of the individual bag 18 subjected to

measurement.

  Also the maneuver and the use of the measuring device according to the invention can be simple, fast and therefore ensuring. efficient operation and efficiency in the test and measurement phase of sachets subjected to control in order to verify their resistance to burst pressure. Each individual bag 18 is placed on the drawer after the latter has been called up, after which the drawer 17 is returned to its active position above the lower plate 6; the operation of the jack 11 is then controlled by the pedal (not shown) authorizing the transmission of the pressure from the hydraulic pump to the jack and

  thus ensures the lowering of the upper plate 5.

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  The pressure exerted by the plate 5 is transferred to the lower plate 6, also sliding on the columns

  side 3 and 4, trapping the bag 18.

  The instantaneous pressure is reviewed and measured by the force sensor 9 which transmits the appropriate signals to the digital display device 16; the latter is preferably of the peak memory type, which consequently makes it possible to recover the measurement of a pressure which would not have been recorded visually by the operator;

  with possibilities of a return to zero.

  The force sensor is provided to allow measurement

up to 5000 daN.

  The number of controls capable of being carried out in series with the apparatus according to the invention allows a flow of

around 6 sachets per minute.

8 2628837

Claims (8)

  1 - Apparatus for measuring the resistance to pressure, in particular for measuring the burst pressure of a flexible envelope, such as a sachet containing a liquid or pasty product, characterized in that it consists of two parallel plates (5,6) defining an interface capable of receiving the sachet (18) subjected to the measurement and placed between the two plates, which are provided to be movable relative to each other, a first plate (5) of pressure transmission receiving the thrust from a motor member such as a jack (11), the thrust exerted by the plate being transferred by the bag to the opposite plate (6) which resists the thrust, being supported on a sensor force 9 capable of measuring said thrust and the force of   compression undergone by the sachet in the intermediate position.   2 - Apparatus according to claim 1, characterized in that the two plates are arranged horizontally and have an upper plate (5) movable downwards, against a second plate   (6) which rests on said force sensor (9).   3 - Apparatus according to claim 2, characterized in that the upper plate (5) is associated with a hydraulic cylinder (11) disposed perpendicularly and above said upper plate (5), the hydraulic cylinder being supplied by a hydraulic pump ( 13) located in the immediate vicinity and to which the cylinder is connected by a flexible pipe (14).   4 - Apparatus according to one of claims 1 to 3,   characterized in that it comprises a fixed base or base (1), on which are mounted a plurality of 9 2628837   t columns (3,4), successively passing through the two parallel plates (5,6), slidably mounted on said columns, which join on the side opposite the base a plate (2) fixed and integral with said columns, the plate serving as support to the thrust member, such as a jack   (11), ensuring the displacement of one of the two parallel plates   lèles, while the base 1 serves as a rest plan for the audit force sensor (9) ..   - Apparatus according to claim 4, characterized in that it comprises two plates (5,6) of   quadrangular shape, mounted to slide, perpendicular to   rement to their plan, on four vertical columns (3,4), respectively secured to a lower base or base (1) and an upper plate (2), the two plates being mounted to move one relative to the other in a vertical movement remaining parallel to themselves.   6 - Apparatus according to one of claims 1 to 5,   characterized in that the trays are more particular-   ment mounted on said columns by   guides such as bearings or ball guides (7.7 ', 8.8').   7 - Apparatus according to one of claims 1 to 6,   characterized in that it comprises a hydraulic pump   (13), capable of controlling the jack (11) ensuring the movement   ment of one of the plates (5) relative to the other (6), the supply and the exhaust of the jack (11) from and to the pump (13) being controlled by means of   a control valve itself subjected to an actuation manual or automatic.   8 - Apparatus according to one of claims 1 to 7,   characterized in that the plate (6), opposite the plate (5) moved by the jack, rests on a force sensor (9) itself trapped between said plate (6) and the base 2628837   1 fixed (1) and the force sensor (9) is connected to a digital display device (16) in position on the platinum (2).   9 - Apparatus according to one of claims 1 to 7,   characterized in that one of the two plates, preferably the lower plate (6), comprises a drawer (17) sliding horizontally enabling the object to be engaged and released,   such as a bag (18), subjected to the pressure measurement.   - Apparatus according to one of claims 1 to 9,   characterized in that it is associated with devices for placing and automatically removing the sachets on the lower tray, the movement of arrival and withdrawal of each sachet being controlled by the movements of raising and then lowering of the tray transmission upper pressure. Od I- 4 <, JU / 'E7 91 _jIl i