Corrugated cardboard and method of its manufacture

 

(57) Abstract:

Corrugated cardboard and the manufacturing method related to the pulp and paper industry and can be used in the manufacture of, for example, packaging materials. Corrugated cardboard contains interconnected using starch-containing adhesive flat layers of cardboard and located between the corrugated paper. This flat layers of cardboard connected with corrugated paper using two types of starch-containing adhesive with different temperatures of gelatinization. The method includes shirring paper, separate cooking two types of starch-containing adhesives, which differ from each other by the gelatinization temperature. Then starch-containing adhesive with high temperature gelatinization is applied on the upper edge of one side of the corrugated surface of the corrugated paper with one layer of cardboard and then gluing on the corrugating machine under high temperature and pressure. After that starch-containing adhesive with a lower temperature of gelatinization is applied on the top edge on the opposite side of the corrugated surface of the corrugated paper with the application of another layer of cardboard and after the definition result is the provision of high-quality cardboard with a maximum speed of homegreat. 2 S. and 4 C.p. f-crystals, 3 tables.

The invention relates to a method of bonding and can be used in the manufacture of corrugated cardboard.

Known corrugated cardboard (Patent SU, 862834, publ. 1981), containing interconnected by means of two flat layers of cardboard and located between the corrugated paper. To connect layers of corrugated cardboard with paper uses the same type of adhesive and the type of starch basis.

The disadvantage of this corrugated cardboard is that when used for bonding paper flat layers of cardboard, a significantly different quality, it turns out corrugated cardboard with different sides of different properties that the further processing and the manufacture of containers of corrugated cardboard may adversely affect the quality of the finished product as a whole.

A known method of manufacturing corrugated cardboard (see ibid.), selected as a prototype. Corrugated cardboard is produced using a continuous two-stage process: in the first stage, the strip of paper is subjected to the shirring on Garofalo steam heated directly on the shafts at the top edge with one hand rifle ondastan high temperature and pressure, smooth shaft is the swelling of the starch grains, gelatinization and evaporation of excess moisture. The result of this operation receive one-sided corrugated cardboard. In the second stage to repeat exactly the same process of gluing't received the corrugations will be crushed under high pressure. Therefore, the last stage is as follows: the adhesive is applied to the opposite upper edge of the corrugated surface of the one-sided corrugated cardboard and it is then applied another layer of cardboard. The bonding in this case occurs by heating the plates at high temperature and at low pressure, just enough to keep the cardboard in contact with the corrugated surface of the paper. The result is going to further processing lightweight and durable corrugated cardboard consists of two flat layers of cardboard glued to located between corrugated paper.

The disadvantage of this method is used at all stages of manufacturing corrugated cardboard starch glue one quality, made by the same technology with the use of a particular type of starch. The glue is fed to two bonding site without taking into account differences in mating conditions on gofrirovannyi each operation is different: on the corrugating machine bonding occurs at relatively high temperature and pressure in a short time, on the plates after applying glue to the size the car at high temperature and relatively low pressure to avoid crushing the corrugated cardboard. Bonding the second stage lasts a few seconds depending on the speed of the corrugator. In General, it can be considered that the conditions of bonding at this stage in comparison with the corrugating machine less favourable accordingly, the requirements to the quality of the glue in this case should be raised.

The temperature of gelatinization of the glue should be, on the one hand, low enough to facilitate the process of gelatinization on the plates after the glue spreading machine, on the other hand, high enough not to cause premature gelatinization in the tub corrugating machine in the absence of a circulation system of glue.

To simultaneously satisfy these two conditions when working on one type of starch is extremely difficult. A sufficiently high temperature gelatinization of the glue makes the bonding at the second stage, forcing to reduce the speed of the corrugator and reduces its performance. Relatively low temperature of gelatinization of the glue causes premature gelatinization of starch in the tub corrugated is einnig bands and increasing the percentage of marriage. Increasing the number of washes corrugating machine leads to loss of useful working time of the corrugator. In addition, an extremely negative influence on the viscosity of the adhesive provides the use of pumps when pumping and the impact of relatively high temperature industrial premises. With a significant drop in the viscosity of the adhesive portion of the starch precipitates, clogging pipes and tubs. The solids content in the adhesive is reduced, therefore, to maintain a satisfactory quality of bonding it is necessary to increase the flow of glue. Thus, the decrease of viscosity leads to excess starch.

The present invention is the task of creating a corrugated carton and method of its manufacture, which through the use of adhesives with parameters that are optimal for specific conditions gluing corrugated paper with layers of cardboard at different stages, would provide a high quality cardboard at the maximum speed of the corrugator.

The problem is solved in that in corrugated paperboard, containing interconnected using starch-containing adhesive flat layers of cardboard and located between garyowen the starch-containing adhesive, different from each other temperatures of gelatinization.

The problem is solved also by the fact that the method of making corrugated paperboard, including corrugating paper, the preparation of starch-containing adhesive and gradual bonding of corrugated paper with two layers of cardboard, in which first stage of the starch-containing adhesive is applied on the upper edge of one side of the corrugated surface of the corrugated paper with the application thereto of one layer of cardboard and then gluing on the corrugating machine under high temperature and high pressure, and in the second stage, starch-containing adhesive is applied on the top edge on the opposite side of the corrugated surface of the corrugated paper with the application to them of another layer of cardboard and then glued on the plates after the glue spreading machine at high temperature and low pressure, according to the invention, separately prepared two types of starch-containing adhesive, which differ from each other by gelatinization temperatures, while in the first phase bonding of corrugated paper with cardboard on the corrugating machine use starch-containing adhesive with high temperature gelatinization, and the second stage sclera with a lower temperature relative to the temperature of gelatinization of the glue, used at the first stage.

Starch-containing adhesive for corrugating machines in comparison with glue for glue spreading machine has increased the gelatinization temperature, lower values of solids, and temperature indicators %S. the Interval initial viscosity at which the adhesive allows to obtain satisfactory bonding in the tub corrugating machine, much wider.

The high value of the temperature of gelatinization of the glue for corrugating machine allows you to completely eliminate unwanted premature gelatinization of the glue in the tub corrugating machine and drastically reduce process downtime corrugator. Due to the specific conditions of gluing on a corrugating machine, the increase in this indicator does not adversely affect the quality of the gluing corrugated cardboard. Use when gluing on the plates after the glue spreading machine glue with a low temperature of gelatinization makes it possible to increase the speed of the corrugating machine to consistently high values. Reduce downtime and increase the speed of the corrugator can increase the production of finished products while reducing scrap rate and supplies the ratio of ingredients. So, according to the invention, as the starch-containing adhesives are used, the adhesive composition in the form of a two-component water system, consisting of a suspension neclaustridialnah starch containing cold water, starch and sodium tetraborate in water solution castelsilano starch, which is a carrier and containing starch, cold and hot water and sodium hydroxide, at the first stage when gluing corrugated paper with cardboard on the corrugating machine use starch-containing adhesive in the form specified adhesive compositions in the following ratio of ingredients:

media:

Starch - 14-25 kg

Hot water - 200-260 l

Sodium hydroxide - 1,3-3,0 kg

Cold water - 90-190 l

suspension:

Cold water - 330-400 l

Starch - 160-210 kg

Sodium tetraborate - 0,4-0,8 kg

and at the second stage when gluing corrugated paper with cardboard on the plates after the glue spreading machines use starch-containing adhesive in the form specified adhesive compositions in the following ratio of ingredients:

media:

Starch - 25-44 kg

Hot water - 230-260 l

Sodium hydroxide is 2.0 - 4.5 kg

Cold water - 140-190 l

suspension:

Cold water - 320-the lei for corrugating machine with the following parameters:

The content of dry substances, % - 15-18

The initial viscosity B3-4, C - 30-55

The temperature of the adhesive,oC - 18-20

The temperature of gelatinization of the glue,oC - 60-65

The indicator %S - 2,0-2,5

The working viscosity according B3-4, C - 20-30

Glue for glue spreading machine has the following parameters:

The content of dry substances, % - 18 - 20

The initial viscosity B3-4, C - 25-35

The temperature of the adhesive,oC - 22-24

The temperature of gelatinization of the glue, oC - 56-59

The indicator %S - 3,5-4,0

The working viscosity according B3-4, C - 25-40

In the preparation of two types of starch-containing adhesive, the use of starch selected from the group consisting of potato, corn and tapioca starches. The possible combinations of different types of starch at different stages there are two approaches: technological and economic. The economic approach allows for a flexible policy on the purchase of certain raw materials, taking into account market conditions. From the point of view of the efficiency of operation of the corrugator is possible to determine the optimal combination of different starch bases for different bonding sites.

One of the possible optimal combinations is the use in the first stage of glue on the basis of securerom stage glue on the basis of the potato starch with the lowest temperature of gelatinization.

In the preparation of starch-containing adhesive for bonding corrugated paper with cardboard on the corrugating machine use cornstarch in the following ratio of ingredients:

media:

Starch - 20 - 25 kg

Hot water - 200 - 240 l

Sodium hydroxide - 2,7 - 3,0 kg

Cold water - 150-190 l

suspension:

Cold water - 330-370 l

Starch - 160-210 kg

Sodium tetraborate - 0.5-0.8 kg

and in the preparation of starch-containing adhesive for bonding corrugated paper with cardboard on the plates after the glue spreading machines use potato starch in the following ratio of ingredients:

media:

Starch - 25-30 kg

Hot water - 240-250 l

Sodium hydroxide is 2.0 - 2.3 kg

Cold water - 140-150 l

suspension:

Cold water - 400-420 l

Starch - 200-220 kg

Sodium tetraborate - 0,6-0,8 kg

The difference in the properties of the adhesives is also provided varying degrees of intensity mixing of its mass. In the preparation of starch-containing adhesive used in the first stage, the adhesive is mixed with the speed of rotation of peremeci is up, mixing device rotate at speeds over 1000 rpm, while the finished adhesive is supplied by gravity.

The proposed method of manufacturing corrugated cardboard is as follows.

Glue on a starch basis for the production of corrugated cardboard are produced separately for each phase bonding of corrugated paper with layers of cardboard. Table 1 shows the formulations of starch-containing adhesive used for the first step for bonding corrugated paper with one layer of cardboard on the corrugating machine.

Preparation of the adhesive is carried out in three stages.

1. Preparation of media

In tank-mixer pour 200-260 l hot water temperatures of 2-4oC below the temperature of gelatinization of the appropriate type of starch. Include a mixing device, for example, frame type, rotating at a speed of 30 rpm, and serves compressed air. Fall asleep 14-25 kg of starch and stirred for 5-10 minutes Pour a solution of sodium hydroxide so that the amount of added reagent 1,3-3,0 kg Stirred for 20-25 minutes Then cooled 90-190 l of cold water having a temperature of 15-20o

2. Preparation of suspension

In the tank for the preparation of suspension is poured 330-400 l of cold water temperature of 15-20oC, include a mixing device and a compressed air supply. Fall asleep 160-210 kg of starch and stirred for 40 minutes Add sodium tetraborate in an amount of 0.4-0.8 kg Stirred for 10-15 minutes

3. Preparation of glue

Suspension under continuous stirring, pour in the cooled medium. Stirred for 10-15 minutes Measure the initial viscosity by viscometer B3-4 and, if necessary, correct it by adding a small amount of water. Measure all the indicators are ready to glue.

The result is the glue with the following parameters:

The content of dry substances, % - 15-18

The initial viscosity B3-4, C - 30-55

The temperature of the adhesive, oC - 18-20

The temperature of gelatinization of the glue,oC - 60-65

The indicator %S - 2,0-2,5

The working viscosity according B3-4, C - 20-30

Table 2 shows the formulation of the adhesive for the second phase bonding of corrugated paper with cardboard on the plates after the glue spreading machine.

Preparation of the adhesive is carried out in three stages.

1. Prigotovleniya the gelatinization of the appropriate type of starch. Include a mixing device, for example, with a disk stirrer rotating at a speed above 1000 rpm, and serves compressed air. Fall asleep 25-44 kg of starch and stirred for 5-10 minutes Pour a solution of sodium hydroxide so that the amount of added reagent was 2.0 to 4.5 kg Stirred for 10-15 minutes Then cooled 100-190 l of cold water having a temperature of 15 - 20oC, to a temperature above which when mixed possible gelatinization of the starch contained in the first portion of the suspension. Mixed media 5-10 minutes

2. Preparation of suspension

In the tank for the preparation of suspension is poured 320-440 l of cold water temperature of 15-20oC, include a mixing device and a compressed air supply. Fall asleep 190-220 kg of starch and stirred for 40 minutes Add sodium tetraborate in an amount of 0.6 to 0.9 kg Stirred for 10-15 minutes

3. Preparation of glue

Suspension under continuous stirring, pour in the cooled medium. Stirred for 5-10 minutes Measure the initial viscosity by viscometer B3-4 and, if necessary, correct it by adding a small amount of water. Measure all the indicators are ready to glue.< The initial viscosity B3-4, C - 25-35

The temperature of the adhesive,oC - 22-24

The temperature of gelatinization of the glue,oC - 56-59

The indicator %S - 3,5-4,0

The working viscosity according B3-4, C - 25-40

In the following table 3 shows examples of the use of various combinations of starch bases for different stages of bonding.

Corrugated cardboard, obtained using different starch bases in the bonding of the various layers, characterized in that depending on the quality of the flat layers of cardboard the opportunity due to the quantity or quality of the applied starch and the use of various additives in the appropriate starch glue to adjust in the right direction quality corrugated cardboard and manufacturing of corrugated packaging.

The system of preparation of glue is a tank for the preparation of suspensions and two tank-mixer, one of which receive adhesive for corrugating machines, and the other adhesive for node glue spreading machine. Supply system contains two tank, piping and valves, which allows the flow of each of the types of adhesives in any section of the tank. The possibility of filing glue is not the so Due to the exclusion of pumps from the system supply of the adhesive, which is supplied from tank mixer in the tank and then to the working bath by gravity, substantially reduce the effects of mechanical impact on the initial viscosity of the adhesive. Dispensing adhesive in a working bath is manufactured using level controls. To minimize the effect of high temperature industrial premises at the initial viscosity is provided by placing a supply tank to a temperature close to the temperature of the finished adhesive.

In the manufacture of corrugated cardboard on the corrugator bonding at the first stage fluting paper is subjected to grooving on the heated hariraya shafts, and the upper edge of one side of the corrugated surface is applied to a starch-containing adhesive, which is optimal for gluing on the corrugating machine. The surface of the corrugated paper with adhesive is brought into contact with one flat layer of cardboard under the action of high pressure and temperature (160-180oC) the bonding of the layers, resulting in a get-sided corrugated cardboard. In the second step of gluing on the top edge with about which is best for gluing conditions on the plates after the glue spreading machine. After applying the adhesive corrugated paper is brought into contact with another flat layer of cardboard. Further bonding occurs as a result of heating of corrugated cardboard on the plates under the action of high temperatures (150-180oC) and relatively low pressure. The resulting continuous process corrugated cardboard goes to further processing.

The development of the technology of preparation of glue with the given parameters in laboratory conditions was carried out on the generated pilot laboratory setup, which is a reduced copy (1:10 linear dimensions and 1: 1000 by volume) of the industrial installation. The development of the technology of gluing corrugated cardboard was carried out under production conditions. Tests were carried out with three main types of starch: potato, corn and tapioca with all possible combinations of starch for corrugating and glue spreading machines.

Process optimization is the introduction of separate preparation and submission of glue using different starch bases can significantly reduce process downtime, the number of defects associated with Necati performance corrugator by increasing its speed.

1. Corrugated cardboard containing interconnected using starch-containing adhesive flat layers of cardboard and located between the corrugated paper, characterized in that the flat layers of cardboard connected with corrugated paper using two types of starch-containing adhesive, which differ from each other temperatures of gelatinization.

2. Method of making corrugated paperboard, including corrugating paper, the preparation of starch-containing adhesive and gradual bonding of corrugated paper with two layers of cardboard, in which first stage of the starch-containing adhesive is applied on the upper edge of one side of the corrugated surface of the corrugated paper with the application thereto of one layer of cardboard and then gluing on the corrugating machine under high temperature and high pressure, and in the second stage, starch-containing adhesive is applied on the top edge on the opposite side of the corrugated surface of the corrugated paper with the application to them of another layer of cardboard and then glued on the plates after the glue spreading machine at high temperature and low pressure, characterized in that the separately prepared two types of starch-containing adhesive, Otley with cardboard on the corrugating machine use starch-containing adhesive with high temperature gelatinization, and in the second phase bonding of corrugated paper with cardboard on the plates after the glue spreading machines use starch-containing adhesive with a lower temperature relative to the temperature of gelatinization of the glue used in the first stage.

3. The method according to p. 2, characterized in that as the starch-containing adhesives are used, the adhesive composition in the form of a two-component water system, consisting of a suspension neclaustridialnah starch containing cold water, starch and sodium tetraborate in water solution castelsilano starch, which is a carrier and containing starch, cold and hot water and sodium hydroxide, at the first stage when gluing corrugated paper with cardboard on the corrugating machine use starch-containing adhesive in the form specified adhesive compositions in the following ratio of ingredients:

media:

Starch, kg - 14-25

Hot water, l - 200-260

Sodium hydroxide, kg - 1,3-3,0

Cold water, l - 90-190

suspension:

Cold water, l - 330-400

Starch, kg - 160-210

Sodium tetraborate, kg 0,4-0,8

and at the second stage when gluing corrugated paper with cardboard on the plates after the glue spreading machine R>media:

Starch, kg - 25-44

Hot water, l - 230-260

Sodium hydroxide, kg - 2,0-4,5

Cold water, l - 140-190

suspension:

Cold water, l - 320-440

Starch, kg - 190-220

Sodium tetraborate, kg - 0,6-0,9

4. The method according to PP.2 and 3, characterized in that in the preparation of starch-containing adhesives, the use of starch selected from the group consisting of potato, corn and tapioca starches.

5. The method according to p. 4, characterized in that in the preparation of starch-containing adhesive for bonding corrugated paper with cardboard on the corrugating machine use cornstarch in the following ratio of ingredients:

media:

Corn starch, kg - 20-25

Hot water, l - 200 - 240

Sodium hydroxide, kg - 2,7-3,0

Cold water, l - 150 -190

suspension:

Cold water, l - 330 - 370

Corn starch, kg - 160-210

Tetraborate sodium, kg - 0,5-0,8

and in the preparation of starch-containing adhesive for bonding corrugated paper with cardboard on the plates after the glue spreading machines use potato starch in the following ratio of ingredients:

media:

Potato starch, kg 25-30

Hot water, l - 240-250
Potato starch, kg - 200-220

Sodium tetraborate, kg - 0,6-0,8

6. The method according to any of paragraphs.2-5, characterized in that in the preparation of starch-containing adhesive used in the first stage, the adhesive is mixed with the speed of rotation of the mixing device is not more than 30 rpm, and in the preparation of starch-containing adhesive used on the second stage mixing device rotate at speeds over 1000 rpm, while the finished adhesive is served by gravity.

 

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