EP3238931A1 - Procédé d'application d'adhésif - Google Patents

Procédé d'application d'adhésif Download PDF

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Publication number
EP3238931A1
EP3238931A1 EP17168673.6A EP17168673A EP3238931A1 EP 3238931 A1 EP3238931 A1 EP 3238931A1 EP 17168673 A EP17168673 A EP 17168673A EP 3238931 A1 EP3238931 A1 EP 3238931A1
Authority
EP
European Patent Office
Prior art keywords
adhesive
foam
bag
paper
stage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP17168673.6A
Other languages
German (de)
English (en)
Inventor
Eigil Kaasgaard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Segezha Packaging AS
Original Assignee
Segezha Packaging AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Segezha Packaging AS filed Critical Segezha Packaging AS
Publication of EP3238931A1 publication Critical patent/EP3238931A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/006—Controlling; Regulating; Measuring; Safety measures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/60—Uniting opposed surfaces or edges; Taping
    • B31B70/62—Uniting opposed surfaces or edges; Taping by adhesives
    • B31B70/628—Applying glue on moving webs to form tubular webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2155/00—Flexible containers made from webs
    • B31B2155/001—Flexible containers made from webs by folding webs longitudinally
    • B31B2155/0012—Flexible containers made from webs by folding webs longitudinally having their openings facing in the direction of movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2155/00—Flexible containers made from webs
    • B31B2155/002—Flexible containers made from webs by joining superimposed webs, e.g. with separate bottom webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2160/00—Shape of flexible containers
    • B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2170/00—Construction of flexible containers
    • B31B2170/20—Construction of flexible containers having multi-layered walls, e.g. laminated or lined

Definitions

  • the present invention relates to an adhesive application process as well as a paper sack manufactured according to the novel and inventive adhesive application process.
  • starch-based adhesives where the solvent is water does provide a number of drawbacks, particularly when the sacks are to be used for foodstuffs in that the starch-based adhesive is organic and as such may form the basis for the growth of fungus or other organically based organisms which in the hygienic environment which is desirable for the handling/production of foodstuffs is very undesirable.
  • the use of a starch based adhesive increases the moisture in the paper materials from which the sack is manufactured from approximately 5-6% to 13-15%. Although this may be considered a slight increase in the moisture in the vicinity/region where adhesives are applied to the sack material this increase in moisture is relatively important with respect to the strength of the sack material in that area and thereby in the overall sack strength.
  • the paper strength (paper being the material from which the sack is manufactured) has its highest strength generally around 8-8.5% moisture such that at lower moisture levels the strength is slightly reduced but clearly at higher moisture contents the strength is severely diminished.
  • the amount of adhesive is reduced by up to approx. 30%.
  • Using a two-component foam adhesive and adapting the production line to the use of a foam adhesive require special arrangements.
  • the adhesives are applied to the paper by means of drums/cylinders, which rotate through a bath and thereafter is brought into contact with the paper (material) in order to apply the adhesive in the designated areas, i.e. the area of the drum where an adhesive is deposited in the bath and which is in contact with the paper. In order to apply the correct amount of adhesive it is important to be able to monitor and control the amount and level of adhesive in the bath.
  • a secondary effect - also related to the foam structure of the adhesive - is the fact that in the adhesive bath the adhesive moves, usually rotates around an axis parallel to the rotation axis of the drum or cylinder which the adhesive shall be transferred to on the adhesive's way to being applied to the paper. This movement further complicates a precise measurement of the adhesive level.
  • the adhesive level influences the amount of adhesive applied to the paper, and is therefore of importance, not only in order to avoid applying too much adhesive, which may cause adhesives migrating uncontrolled outside the designated adhesive zones, but also from a cost perspective in that these types of adhesives are relatively expensive compared to ordinary starch-based alternatives.
  • the present invention achieves these objects by a foam-adhesive application method in a paper bag production line, where said bag comprises two or more layers, where the paper material from which the bag is manufactured is continuously transported through the production line in a transport direction, where the bag production line comprises four stages:
  • the adhesive amount is defined as less than (in fact only 80 % or even less - often only 60%) what is used with starch based adhesives shall be seen in relation to the manufacturing process. It is foreseen as discussed above that the conversion process (from flat paper material on rolls to finished sacks) is carried out on large industrial installations, as for example supplied by Windmöller und Hölscher. When operating these installations the operator will, depending on the paper material being used, adjust the amount of adhesive to be used for that particular conversion process. The operator will naturally also adjust/control a number of other parameters which with respect to the present invention is of lesser importance. In the process of obtaining a satisfying adhesion through the conversion process an amount of adhesive is selected to be applied.
  • the amount is determined with respect to applying enough adhesive to the surfaces which are destined to be adhered together, and also minimizing the amount of adhesive, such that the adhesive does not spread to undesired places (such as for example outside the limitations of intended adhesive areas). Also from an economic point of view saving adhesive is important. Consequently, with the present invention, it has surprisingly been found that it is possible to use at least 80 % less adhesive, by using the foam adhesive as described above. In addition to the other advantages obtained by using less adhesive - as discussed in this description, the lesser amount of adhesive provides economic advantages, and the risk of polluting the paper outside designated adhesive areas is reduced dramatically. Therefore the expression 80% less does convey a clear instruction to the skilled operator on how to implement the invention.
  • At least 50 % (by weight) less adhesive is used.
  • the still fresh adhesive When the paper materials to be adhered to each other are forced together, the still fresh adhesive will be squeezed, and thereby spread out into a substantially two dimensional plane substantially parallel to the plane of the paper in that particular region.
  • the adhesive it may be difficult to control the adhesive in its designated area. With less adhesive the risk of the adhesive being squeezed out of the designated area is much less.
  • the adhesive is a foam
  • the adhesive will when squeezed deform, also into the area/volume occupied by the bubbles (air or gas) in the foam. Therefore, in addition to using less adhesive, the adhesive will also be more effectively distributed within the designated adhesive area, and further it is easier to control the adhesive within the designated area.
  • Any fresh adhesive which is not covered by paper may give cause to an undesired adhesive contact, for example with another bag. Due to the very rapid manufacturing speed the adhesives have not hardened/cured by the time the paper bags leave the production line, and as such it is possible for excess adhesive to come into contact with another bag in the stack at the end of the production line, and thereby create further inconveniences when the bags are to be used.
  • these types of bags are used in an automated manufacturing and filling process, such that a robot or the like will take the bag from the stack and arrange it in a fill position whereby the products which the bags are to hold are automatically filled into the bag.
  • the amount of adhesive is also a source of moisture for the paper to which it is applied.
  • the paper strength is the highest when the moisture content of the paper is the range 8-8.5%.
  • the moisture content in the area in the vicinity of where the adhesive is applied is increased to approx. 13-14%. This in turn results in a weakness of the paper in that area by approximately 15-20%.
  • the moisture content is kept around 8.5%.
  • the paper retains its strength and has the highest TEA rate. This again facilitates that the finished product, i.e. the paper sacks, may be used immediately after manufacture in that the moisture content in the sacks and thereby the strength of the adhesive connections is very high right after manufacture.
  • the moisture as already mentioned is increased and thereby the strength is decreased such that by this type of manufacture the overall sack has a decreased strength.
  • the manufactured sacks are often stored in order to allow the sacks to dry thereby obtaining a moisture content around 8-9%.
  • the foam adhesive is a two-component adhesive, where the adhesive is mixed immediately before being deposited in an adhesive bath, where adhesive application rollers/cylinders are arranged in said bath, such that the periphery or part of the periphery of at least one roller is brought into contact with the paper material.
  • the adhesive is mixed immediately prior to being placed in the adhesive bath and consequently such that there will be a constant use of adhesive requiring constant mixing and refilling of the bath, it is always ensured that a fresh adhesive having the correct and constant properties is always present in the bath.
  • the one-component adhesive may harden or draw a skin, i.e. a not so fluid surface layer, which makes the application of adhesives on the paper more inconsistent and unreliable.
  • non-contact detection means are provided for detecting a predetermined adhesive level in the adhesive bath, and where said means are connected to the means for mixing the two-component adhesive, such that the volume mixed is controlled by the detection means.
  • the contactless sensor measuring the adhesive level will typically register a level every 1/10 th of a second, and for practical purposes average measurements taken over for example 1 or 2 seconds. This average value is then used as an indication of the "true" level in the foam.
  • the foam adhesive has a density between 100 grams per liter to 900 grams per liter, more preferred 200 grams per liter to 600 grams per liter.
  • the foam characteristics are obtained by mechanical aeration during the mixing of the two components or by chemical reaction between the two components during the mixing of the two components.
  • Mechanical aeration means a process where the adhesive components during mixing are severely agitated, for example by a mixing wheel or propeller, such that although the components as such do not contain bubbles, a large amount of air is mixed into the adhesive prior to being placed in the adhesive bath and applied to the paper material.
  • the two components may be designed such that they will react with each other creating a chemical aeration whereby mechanical agitation is not necessary.
  • the adhesive in the third stage the adhesive is applied to the paper material by means of an adhesive cliché, which cliché is mounted on a roller such that a surface of the cliché is brought into contact with an opposing adhesive roller, said adhesive roller being in contact with an adhesive bath.
  • the actual amount of adhesive will be less although the volume may be the same or as in this invention reduced by at least 20% such that less adhesive is applied by the cliché to the paper.
  • the paper will at this stage be subjected to a folding routine forming the closed end of the bag.
  • FIG 1 is illustrated a usual adhesive supply system where in a first station 10 the adhesive is prepared, i.e. filled into the main supply tank. From the first station 10 a pipeline 20 is supplying the liquid adhesive to a distribution manifold 30 from which separate pipelines 32, 34, 36, 38 distribute the adhesive to each machine or production line 40.
  • the adhesive may be further sub-supplied by separate supply lines 42, 42' and 42" to the separate adhesive stations situated various places in the machines/production line.
  • FIG 2 is illustrated the set-up when using a foam adhesive and in particular a two-component foam adhesive.
  • the two foam adhesive components are supplied to a mixing unit 50 by separate supply lines 52, 54 such that the foam adhesive is only activated during the mixing in the adhesive mixing unit 50.
  • a pipeline 56 From the adhesive mixing unit a pipeline 56 directs the mixed foam adhesive to pipelines 58', 58", 58'" connected to separate glue stations in the production line or each separate machine 40'.
  • Each separate sub-supply line 58', 58" etc. may be supplied with valve means 59.
  • valve means 59 are typically connected to a sensor positioned at the glue stations such that by measuring the level of adhesive or glue in the glue stations the valve means may regulate the opening and closing of the supply such that an optimum amount of adhesive is present at the desired adhesive stations.
  • the sensors are typically non-contact types such as radar based systems or a laser based systems.
  • a float may be used which float is positioned such that it will float on the surface of the adhesive in the vicinity of the sensor, whereby the sensor will in fact measure the level/distance from the sensor to the float and thereby determine the amount of adhesive present in the adhesive/glue station.
  • FIGS 3, 4 and 5 are illustrated examples of glue stations where special means are adapted in order to be able to apply the foam adhesive in a paper sack manufacturing process.
  • FIG 3 is illustrated an adhesive station where adhesive is supplied to a large cylinder 60.
  • the foam adhesive is supplied by pipeline 58 to an adhesive storage tank 61.
  • On the surface of the adhesive 64 is placed a float superposed a non-contact sensor such that the sensor will be able to measure the distance between the sensor and the float 62 and thereby determine the level of adhesive in the adhesive container 61.
  • the measurement from the sensor 63 is used as input for a control device (not illustrated) controlling the valve 59 such that the valve will be opened or closed in order to maintain a certain predetermined level 64 in the adhesive container 61.
  • a second roller 65 is rotatably arranged such that it will come into contact with the surface 64 of the adhesive in the adhesive container 61 and whereby a thin layer of adhesive will be applied to the roller 65.
  • a counter roller 66 is adjusted such that a desired minimum/maximum amount of adhesive is applied to the roller 65.
  • the layer of adhesive on the roller 65 may be kept substantially thinner than regular starch-based adhesives.
  • this provides advantages in that less adhesive is transferred from one roller to another thereby reducing the risk of pollution to the ambient environment. If too much adhesive is allowed to be attached to the rollers and the rollers are rotated at speed, the rollers may spray adhesive to the ambient surroundings thereby polluting the adhesive station and possibly the paper in positions where it is undesirable to have an adhesive applied to the paper.
  • the large drum 60 is typically used in order to apply a long line of continuous adhesive to the paper in order to convert the flat paper into a cylindrical shape during the sack-forming process.
  • FIG. 4 a and 4 b a further glue station for a different type of connection in the paper sack is illustrated.
  • this glue station two cylinders 70, 71 are counter rotated such that an adhesive pool 72 is maintained between the two cylinders 70, 71.
  • adhesive application rotator 73 is arranged above the adhesive pool such that adhesive application means 74 are rotated into the adhesive pool 72 before coming into contact with the paper 75 from which the sack is formed.
  • various patterns, particularly discreet adhesive patterns may be applied to the paper 75.
  • FIG 4b is illustrated an example of such a pattern where adhesive dots 76 have been applied to the paper 75 by the adhesive application means 74 arranged on the rotator 73.
  • the adhesive application means 74 As the two component foam adhesive contains solvents, it is important to select the adhesive application means 74 from a material which is not dissolved by the solvents of the adhesive and at the same time are able to apply the adhesive to the paper 75, for example in a pattern as illustrated in figure 4 b. For many sacks it is undesirable to have discolouring arising from the interaction of paper and adhesive, particularly when the adhesive is polluted, for example by dissolving the adhesive application means 74. Traditionally rubber has been used as application means, but with the two component foam adhesive used with the present invention rubber will create a discolouring, particularly in a green colour which is undesirable.
  • the invention therefore uses application means 74 from various other materials such as for example neoprene, nylon or specifically chemically resistant nylons, i.e. modified nylons, or stainless steel.
  • FIG 5 a further example of a specific glue station is illustrated.
  • two drums 80, 81 are counter-rotated.
  • a block 82 On the first drum 80 is arranged a block 82 and the second drum 81 is arranged in connection with a foam adhesive bath such that a film of foam adhesive 83 will be present on the surface of the drum 81.
  • a layer of adhesive will be transferred from the drum 81 to the block 82.
  • the block 82 will have shape as illustrated in figure 5b , i.e. a rectangular shape with some openings 82'. Due to the contact with the adhesive layer 83 on the drum 81 the block 82 will where it has edges facing the direction of rotation accumulate excessive adhesive 84.
  • the block 82 will provide a pattern as illustrated in figure 5c , see the dotted area 86.
  • the excess amount of adhesive 84 would when using a normal starch-based adhesive create an undesirable adhesive surplus on the paper 75.
  • the adhesive layer may only be 50% of the normal layer (of starch adhesive) such that a substantially lower amount of adhesive is applied to the block 82 and thereby the undesirable accumulations 84, see figure 5b , are dramatically reduced or avoided altogether. This will result in an adhesive pattern 86 without the undesirable adhesive blotches which may otherwise arise with use of normal starch-based adhesives.
  • the adhesive layer 83 on the drum 81 is reduced to approx. 0.1 mm or less.
  • the adhesives will be squeezed and thereby displaced in a plane parallel to the paper surface creating an adhesive pattern substantially larger than the intended pattern as illustrated by 86 in figure 5C .
  • the bubbles in the foam when being squeezed together will allow the non-foam part of the foam adhesive to expand into the space where the bubble is/was present, and thereby substantially keep the adhesive pattern 86 as illustrated in figure 5 c. In this manner a much more accurate adhesive application is obtained due to the use of a foam based adhesive.

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  • Making Paper Articles (AREA)
  • Adhesives Or Adhesive Processes (AREA)
EP17168673.6A 2016-04-29 2017-04-28 Procédé d'application d'adhésif Withdrawn EP3238931A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DKPA201670274 2016-04-29

Publications (1)

Publication Number Publication Date
EP3238931A1 true EP3238931A1 (fr) 2017-11-01

Family

ID=58644944

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17168673.6A Withdrawn EP3238931A1 (fr) 2016-04-29 2017-04-28 Procédé d'application d'adhésif

Country Status (1)

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EP (1) EP3238931A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107901507A (zh) * 2017-12-06 2018-04-13 福建南王环保科技股份有限公司 一种手提袋手柄自动粘贴系统

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4634414A (en) * 1983-07-08 1987-01-06 Kochsiek Maschinenbau Gmbh Soltau Method and apparatus for manufacturing folding paper sacks
US20050087293A1 (en) * 2000-05-17 2005-04-28 Prescott Paper Products (Usa), Inc. Wet waste compostable bag and method and apparatus for manufacturing same
US20110301007A1 (en) * 2010-06-02 2011-12-08 Andreas Lamkemeyer Device and method for the production of tubes or sections of tubes
US20120259448A1 (en) * 2009-12-21 2012-10-11 Henkel Corporation Method and system for regulating adhesive application
US20150322301A1 (en) * 2013-01-24 2015-11-12 Henkel Ltd. Foamable hot melt adhesive compositions and use thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4634414A (en) * 1983-07-08 1987-01-06 Kochsiek Maschinenbau Gmbh Soltau Method and apparatus for manufacturing folding paper sacks
US20050087293A1 (en) * 2000-05-17 2005-04-28 Prescott Paper Products (Usa), Inc. Wet waste compostable bag and method and apparatus for manufacturing same
US20120259448A1 (en) * 2009-12-21 2012-10-11 Henkel Corporation Method and system for regulating adhesive application
US20110301007A1 (en) * 2010-06-02 2011-12-08 Andreas Lamkemeyer Device and method for the production of tubes or sections of tubes
US20150322301A1 (en) * 2013-01-24 2015-11-12 Henkel Ltd. Foamable hot melt adhesive compositions and use thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107901507A (zh) * 2017-12-06 2018-04-13 福建南王环保科技股份有限公司 一种手提袋手柄自动粘贴系统
WO2019109719A1 (fr) * 2017-12-06 2019-06-13 福建南王环保科技股份有限公司 Système de fixation automatique d'une poignée de sac de transport
CN107901507B (zh) * 2017-12-06 2019-10-18 福建南王环保科技股份有限公司 一种手提袋手柄自动粘贴系统

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