EP0077131B1 - Herstellung einer Verpackungsschachtel - Google Patents

Herstellung einer Verpackungsschachtel Download PDF

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Publication number
EP0077131B1
EP0077131B1 EP82304832A EP82304832A EP0077131B1 EP 0077131 B1 EP0077131 B1 EP 0077131B1 EP 82304832 A EP82304832 A EP 82304832A EP 82304832 A EP82304832 A EP 82304832A EP 0077131 B1 EP0077131 B1 EP 0077131B1
Authority
EP
European Patent Office
Prior art keywords
reinforcing agent
starch
liner
core liner
corrugated cardboard
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.)
Expired
Application number
EP82304832A
Other languages
English (en)
French (fr)
Other versions
EP0077131A3 (en
EP0077131A2 (de
Inventor
Masayuki Ono
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.)
Tomoku KK
Original Assignee
Tomoku KK
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
Priority claimed from US06/310,817 external-priority patent/US4437850A/en
Application filed by Tomoku KK filed Critical Tomoku KK
Publication of EP0077131A2 publication Critical patent/EP0077131A2/de
Publication of EP0077131A3 publication Critical patent/EP0077131A3/en
Application granted granted Critical
Publication of EP0077131B1 publication Critical patent/EP0077131B1/de
Expired 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
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/20—Corrugating; Corrugating combined with laminating to other layers
    • B31F1/24—Making webs in which the channel of each corrugation is transverse to the web feed
    • B31F1/26—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions
    • B31F1/28—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions combined with uniting the corrugated webs to flat webs ; Making double-faced corrugated cardboard
    • B31F1/2886—Additionally reinforcing, e.g. by applying resin or wire
    • 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
    • B31B2100/00—Rigid or semi-rigid containers made by folding single-piece sheets, blanks or 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
    • B31B2110/00—Shape of rigid or semi-rigid containers
    • B31B2110/30—Shape of rigid or semi-rigid containers having a polygonal cross section
    • B31B2110/35—Shape of rigid or semi-rigid containers having a polygonal cross section rectangular, e.g. square
    • 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
    • B31B2120/00—Construction of rigid or semi-rigid containers
    • B31B2120/70—Construction of rigid or semi-rigid containers having corrugated or pleated walls
    • 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
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/25—Surface scoring

Definitions

  • This invention relates to a process of manufacturing reinforced corrugated cardboard for use in making packaging containers such as carton boxes, and more particularly relates to a process of manufacturing packaging containers made of reinforced corrugated cardboard and having improved pressure resisting properties.
  • Corrugated cardboard packaging containers are widely used for various packaging applications because they are light in weight and strong in mechanical strength.
  • the commodities to be contained therein are heavy and the corrugated cardboard packaging containers containing the commodities are piled one upon another, there is the danger that the pressure applied to the containers will be beyond the limit of the pressure resisting strength of the corrugated cardboard itself, whereby deformation or breakage of the packaging containers will take place.
  • Japanese Utility Model Laid-Open Application 52-84427 it has been proposed that the pressure resisting strength of a packaging container be improved by applying a reinforcing agent to the core of the corrugated cardboard forming the four side portions of the body of the packaging container.
  • reinforced corrugated cardboard packaging containers if reinforced corrugated cardboard manufactured by conventional manufacturing process is used, the necessary reinforcement cannot be fully attained.
  • a reinforcing agent is applied to a sheet of cardboard, the reinforced cardboard is then formed by pressing into a corrugated core liner, thereafter front and back liners are adhered to both faces of the liner to obtain reinforced corrugated cardboard, thereafter the reinforced corrugated cardboard is scored so that score lines are formed in the cardboard, and a packaging container is then formed.
  • FR-A-1222981 (upon which the precharacterising portion of claim 1 herein is based) there is disclosed a process of manufacturing reinforced corrugated cardboard for use in making a packaging container, which comprises adhering one face of a corrugated core liner to a side liner with an aqueous solution comprising starch; applying to the other face of the corrugated core liner an aqueous solution comprising starch and thereafter a reinforcing agent; adhering another side liner to said other face of the core liner; and heating the two side liners and the corrugated core liner to form reinforced corrugated cardboard.
  • the present invention provides a process of manufacturing a reinforced corrugated cardboard type packaging container in which the score line portions are reinforced without fail and its resistance to pressure is improved.
  • a process of manufacturing reinforced corrugated cardboard for use in making a packaging container which comprises adhering one face of a corrugated core liner to a side liner with an aqueous solution comprising starch; applying to the other face of the corrugated core liner (a) an aqueous solution comprising starch and thereafter (b) a reinforcing agent; adhering another side liner to said other face of the core liner; and heating the two side liners and the corrugated core liner to form reinforced corrugated cardboard; characterised in that, before completion of the hardening of said reinforcing agent, score lines for a packaging container are formed in the reinforced region of the reinforced corrugated cardboard; in that each of said aqueous solutions comprising starch is an aqueous solution comprising corn starch; and in that said reinforcing agent comprises 60 to
  • a sheet A for a core liner is heated and dried by a preheater 1 and is press-formed into a corrugated core liner by corrugator 2.
  • an adhesive agent comprising an aqueous solution mainly composed of corn starch, by a coating apparatus 3, this agent being applied to the crests of one face of the corrugated core liner A.
  • the corrugated core liner A is adhered to one side liner B, which is previously heated and dried by a preheater 8.
  • aqueous solution mainly composed of corn starch by a coating apparatus 4, this solution being applied to the crests of the other face of the corrugated liner A.
  • a reinforcing agent D is applied by an applicator 5, partially in the region in which score lines for forming a packaging container are to be formed later.
  • corrugated core liner A is then adhered to another side liner C, so that a sheet of reinforced corrugated cardboard E is formed, this corrugated cardboard being heated by a heating plate apparatus 6 to increase the stickiness of the bonding agent.
  • the reinforced corrugated cardboard E is continuously fed to a slitter-scorer apparatus 7 and is formed with score lines F, before completion of the hardening of the reinforcing agent D applied to the reinforced corrugated cardboard E as above, and also is cut to any desired width and form.
  • the score lines are formed in the reinforced region of the reinforced corrugated cardboard without crushing and destroying the structure of that region.
  • the reinforcing agent D is applied to the core liner only in the region thereof in which score lines are to be formed.
  • the reinforcing agent D may be applied not only to the foregoing region thereof but also to additional regions thereof corresponding to the whole of the four side walls of the packaging container to be formed.
  • the adhesive agent used in this invention is an aqueous solution mainly composed of corn starch. It may be gelatinized, and is usually applied to the corrugated core liner A in a viscous condition at a temperature of 70°C to 90°C.
  • the adhesive agent may be used in the form of an aqueous solution of corn starch at the time of application thereof to the corrugated core liner, and thereafter may be gelatinized by heating the core liner and both the side liners, such as by use of the heating plate apparatus 6.
  • the step of applying the reinforcing agent to the core liner is an additional step as compared to the steps of a conventional process of manufacturing corrugated cardboard.
  • the heating time necessary for strengthening the mutual bonding of the laminate members A, B, C by the heating plate apparatus 6 is prolonged.
  • the aqueous solution mainly composed of corn starch is applied to the core liner and thereafter is gelatinized by heating for effecting the mutually bonding of the laminate members A, B, C, and when a reinforcing agent of a low temperature is applied onto the aqueous solution, the heating time has to be extended for gelatinization of the said solution. This results in a lowering in the production efficiency of reinforced corrugated cardboard. This problem can be overcome by preheating the reinforcing agent and then applying this preheated reinforcing agent to the core liner.
  • the aqueous solution mainly composed of corn starch is applied to the core liner and thereafter is heated to gelatinize it
  • a reinforcing agent which has been preheated above the gelatinization temperature of the aqueous solution.
  • adhesive agents there may be usd a Stein-Hall formulation, which is of such a kind that an aqueous solution mainly composed of corn starch is heated to approximately 50°C to 60°C to gelatinize it.
  • the reinforcing agent should be preheated to about 60°C or higher, preferably to 70°C to 85°C, taking into consideration its heat loss by radiation at the time of application of the reinforcing agent to the core liner.
  • the invention is illustrated by the following Tests.
  • the supply speed of the core liner to the heating plate apparatus can be increased and also the water content in the reinforced corrugated cardboard manufactured can be decreased so that the time for complete bonding of the core liner to the side liner can be reduced, resulting in an improvement in the manufacturing efficiency.
  • the reinforcing agent should not harden at the temperature of the heated plate of the apparatus 6. If, after the reinforcing agent is applied to the core liner A, it is difficult for the adhesive agent to attach to the core liner A, so that the strength of the bond between the core liner A and the surface liner C is reduced. Therefore, it is preferable to apply the reinforcing agent D after the application of the adhesive agent to the core liner A. Accordingly, it is preferable to use a reinforcing agent able to sufficiently penetrate into the core liner A to which the adhesive agent has already been applied. Furthermore, for the purpose of partially reinforcing only the score line portions at the time of forming a packaging container, it is preferable to use a reinforcing agent which is suitable for application by spraying.
  • a reinforcing agent comprising chemically treated or processed starch, water, a surface active agent, and a water resisting agent for starch is especially suitable as the reinforcing agent used in this invention.
  • a reinforcing agent comprises 60 wt% to 40 wt% of the processed starch, 40 wt% to 60 wt% of water, 0.1 wt% or less of the surface active agent, and a water resisting agent for starch in an amount which is 6 wt% or more relative to the solid content of the processed starch.
  • the reinforcing agent have as high concentration as possible and as low a water content as possible so as not to deform the corrugations of the core liner when the reinforcing agent is applied to the core liner, and that it have so low a coefficient of viscosity as to facilitate application thereof by spraying.
  • This coefficient is preferably 100 cps or less (BH type viscosimeter at 20 rpm) at the temperature (20°C to 80°C) for a corrugated cardboard manufacturing process.
  • an aqueous solution comprising 40 wt% to 60 wt% of processed starch and 60 wt% to 40 wt% of water.
  • the processed starch dextrin, oxidized starch or the like may be used, but in view-of the strength of the coating film formed on the core liner by application of the reinforcing agent, and of facilitation of the application by spraying, dextrin is preferable.
  • a reinforcing agent including 40 wt% to 60 wt% of the processed starch meets the above described requirements, but because of its comparatively high concentration, it is somewhat unfavourable in respect of the penetration into the core liner.
  • a surface active agent is added.
  • the surface active agent a dialkyl sulphosuccinate ester, an alkyl naphthalene sulphonate ester, or the like, is preferably used.
  • a dialkyl sulphosuccinate ester is preferably used because it has defoaming properties effective in preventing uneven coating on the core liner caused by foaming of the reinforcing agent when the reinforcing agent is applied by spraying.
  • the amount of the surface active agent exceeds 0.1 wt%, appreciably improved mechanical strength cannot be observed; rather foaming becomes easier at the time of the spraying, so that a uniform coating on the core liner cannot be produced.
  • a surface active agent is added, but at the same time the hygropscopic properties of the core liner coated with the reinforcing agent iare increased.
  • the water content of the corrugated cardboard is increased to, for example, 12 wt% to 13 wt%, so that its mechanical strength is reduced. Therefore, in order to increase its resistance to moisture and maintain its mechanical strength, a water resisting agent for starch is added to the reinforcing agent in an amount based on the amount of the processed starch.
  • the water resisting agent for starch trimethoxy methyl melamine or the like are preferably used.
  • a preferred amount of the water resisting agent for starch is 6 wt% to 10 wt% based on a solid component, i.e. the dry matter content of the processed starch.
  • 6 wt% or more of the water resisting agent for starch non-reinforced corrugated cardboard which has a 70% residual strength can be increased in its residual strength.
  • an amount thereof exceeding 10% no appreciable increase in the residual strength is obtained, but rather the chemical reaction of the water resisting agent with the processed starch does not take place and the water resisting agent for starch is liberated.
  • Conventional product No. 1 is one produced by applying the reinforcing agent to the core liner before feeding the core liner to the corrugator, and conventional product No. 2 is one made of non-reinforced corrugated cardboard.
  • composition of the reinforcing agent and the amount thereof applied were the same as in Test 2.
  • composition of the adhesive agent and the amount thereof applied were the same as in Test 2.
  • the results are given in Table 3.
  • a corrugated core liner and both side liners are adhered together by an adhesive agent comprising an aqueous solution composed mainly of corn starch, so that even in the case where the reinforcing agent is applied to the core liner after the adhesive agent has been applied to the core liner, the reinforcing agent can penetrate sufficiently into the core liner and does not hamper the adhering of the core liner and the side liner, and consequently reinforced corrugated cardboard excellent in pressure resisting strength can be produced.
  • the score lines for the packaging container are scored before the reinforcing agent hardens, so that the structure of the score line region thereof is not destroyed and reinforced corrugated cardboard packaging containers having improved pressure resisting properties can be made. The process of this invention can be carried out easily and simply by incorporating the reinforcing in any conventional existing corrugator.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
  • Laminated Bodies (AREA)

Claims (2)

1. Verfahren zur Herstellung von verstärkter Wellpappe (E) zur Verwendung bei der Herstellung einer Verpackungsschachtel, wobei man
die eine Seite einer gewellten inneren Bahn (A) mit einer wässrigen stärkehaltigen Lösung auf eine Seitenbahn (B) ankleistert,
auf die andere Seite der gewellten inneren Bahn (a) eine wässrige stärkehaltige Lösung und danach (b) ein Verstärkungsmittel (D) angbringt,
eine andere Seitenbahn (C) auf die genannte andere Seite der inneren Bahn (A) ankleistert,
und die beiden Seitenbahnen (B, C) sowie die gewellte innere Bahn (A) erhitzt, um verstärkte Wellpappe (E) zu bilden, dadurch gekennzeichnet, dass
man in verstärkten Bereich der verstärkten Wellpappe (E) Kerblinien (F) für eine Verpackungsschachtel bildet, bevor man die Härtung des genannten Verstärkungsmittels (D) beendet,
jede der genannten wässrigen stärkehaltigen Lösungen eine wässrige maisstärkehaltige Lösung ist, und
das genannte Verstärkungsmittel (D) 60 bis 40 Gew.-% verarbeiteter Stärke, 40 bis 60 Gew.-% Wasser, bis zu 0,1 Gew.-% eines Tensids und, bezogen auf den Feststoffgehalt an der genannten verarbeiteten Stärke, 6 Gew.-% oder mehr eines Agens, das Stärke gegen Wasser widerstandsfähig macht, umfasst.
2. Verfahren nach Anspruch 1, bei dem, nachdem man die wässrige maisstärkehaltige Lösung und das Verstärkungsmittel (D) auf die gewellte innere Bahn (A) angebracht hat, man das Verstärkungsmittel (D) über dessen Gelatinisierungstemperatur vorheizt.
EP82304832A 1981-10-13 1982-09-14 Herstellung einer Verpackungsschachtel Expired EP0077131B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/310,817 US4437850A (en) 1980-10-14 1981-10-13 Process of manufacturing of reinforced corrugated cardboard type packaging container
US310817 1989-02-13

Publications (3)

Publication Number Publication Date
EP0077131A2 EP0077131A2 (de) 1983-04-20
EP0077131A3 EP0077131A3 (en) 1984-09-05
EP0077131B1 true EP0077131B1 (de) 1987-06-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP82304832A Expired EP0077131B1 (de) 1981-10-13 1982-09-14 Herstellung einer Verpackungsschachtel

Country Status (2)

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EP (1) EP0077131B1 (de)
ES (1) ES516465A0 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2592209A1 (de) 2011-11-11 2013-05-15 Bayer MaterialScience AG Vakuumisolierplatte

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5292391A (en) * 1991-04-29 1994-03-08 Wyerhaeuser Company Corrugated paperboard strength enhancing process

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55142482A (en) * 1979-04-24 1980-11-07 Nec Corp Magnetic bubble memory element

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1222981A (fr) * 1958-04-30 1960-06-14 West Virginia Pulp & Paper Co Procédé de fabrication du carton ondulé imprégné de cire
US3189502A (en) * 1961-03-03 1965-06-15 West Virginia Pulp & Paper Com Method of making impregnated corrugated paperboard sheets on a corrugator machine
BE746945A (fr) * 1969-03-07 1970-09-07 Exxon Research Engineering Co Procede de traitement de carton ondule
US3619342A (en) * 1969-07-18 1971-11-09 Alton Box Board Co Corrugated fiberboard
US3687767A (en) * 1971-02-25 1972-08-29 Alton Box Board Co Scoring process for certain rigid-when-wet corrugated fiberboard
SE391153B (sv) * 1972-12-05 1977-02-07 A E Edkvist Forfarande och anordning for tillverkning av vagpapp

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55142482A (en) * 1979-04-24 1980-11-07 Nec Corp Magnetic bubble memory element

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2592209A1 (de) 2011-11-11 2013-05-15 Bayer MaterialScience AG Vakuumisolierplatte

Also Published As

Publication number Publication date
ES8308952A1 (es) 1983-10-16
EP0077131A3 (en) 1984-09-05
EP0077131A2 (de) 1983-04-20
ES516465A0 (es) 1983-10-16

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