JPH0645213B2 - Cardboard manufacturing equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a cardboard manufacturing apparatus, and more particularly, to a cardboard manufacturing apparatus suitable for manufacturing a cardboard using a sheet material having a thermoplastic synthetic resin layer on both surfaces of an intermediate layer as a liner material. Is.

(Prior Art) A so-called corrugated cardboard, in which a liner material is arranged on one or both sides of a core material and joined together, has been widely used as a buffer packaging material, and the core material is provided with two grooves. It is made by corrugating with a roll and pressing a liner with an adhesive.

However, in recent years, in order to reduce the amount of adhesive, a method without using an adhesive and a device therefor have been proposed.A method in which an extruded melt liner is attached to one side and then cooled and then attached to one side, or a core material is used. After corrugation, it is heated to a temperature above its melting point with an infrared heater and corrugated rolls, and a method and device for bonding it to a liner at a temperature below the melting temperature. And then pressure-bond them by sandwiching them with a liner material and a core material,
Devices and the like have been proposed. (Japanese Patent Publication No. 56-18379)
(Problem to be solved by the invention) However, the manufacturing method and apparatus of each cardboard proposed above are not suitable for extruded melt liner bonding, which is a joint using a resin material, or for film sandwiching in a hot melt state. The resin material is in a molten state over the entire surface, and when it is cooled, it contracts, causing wrinkles on the surface and varying dimensions, which deteriorates the appearance of the product.

The present invention addresses the above situation, pays attention to the characteristics of the liner material having the thermoplastic synthetic resin layers on both surfaces of the intermediate layer, and finds that the fixing of the necessary parts for joining is stopped, and the cardboard itself is manufactured at once, The purpose of the present invention is to keep the resin temperature of the liner material at a suitable level, to prevent controllability, to prevent unnecessary shrinkage of the resin, and to prevent deterioration of the appearance.

(Means for Solving the Problems) That is, the feature of the cardboard manufacturing apparatus of the present invention that meets the above-mentioned object is, firstly, that a liner material and a core material each consisting of a pair of a heated smooth roll and a grooved roll are used. Pressure contact bonding roll means, liner material supplying means for supplying and guiding the liner material to introduce the liner material into the bonding roll along the smooth roll, and the core paired with the grooved roll of the bonding roll means. With a core material introducing means for introducing a core material between the joining rolls along the grooved roll by corrugating the material, and the liner material supplying means to the roll surface as the supply speed increases and decreases. The contact area is changed to be large when the supply speed is increased and small when the supply speed is decreased, and is provided with a heating roll capable of adjusting the heating temperature of the liner material to be constant, and a mechanism capable of contacting and separating the liner material with the heating roll, Also core material The supply means is equipped with a heating means for heating the corrugated top of the core material to be joined to a predetermined temperature or higher.

Further, according to the invention of claim 2, the present invention is an embodiment of the above apparatus in which the heating means for heating the wavy top of the core material is constituted by a heating roll which can be brought into contact with and separated from the grooved roll constituting the joining roll. To do.

The invention according to claim 3 of the present invention is directed to the production of a single-sided cardboard, while the invention is expanded to a double-sided cardboard. A means for feeding the material, a means for supplying the second liner material to be joined to the opposite surface of the interleaved liner material, and a means for joining the second liner material to the core material. Characterize.

(Operation) According to the manufacturing apparatus as described above, even when a sheet material using a thermoplastic synthetic resin layer as the liner material or an intermediate paper layer or both sides of the intermediate paper layer and the aluminum layer is used, the liner material itself is waterproof. Needless to say, if this is joined to a core material to manufacture a cardboard, it becomes easy to manufacture cardboard having good waterproofness all at once.

In joining, the corrugated top of the core material is heated by a heating means to a temperature not lower than the melting temperature of the thermoplastic synthetic resin of the liner material sheet, and at the time of joining, the thermoplastic synthetic resin of the corrugated top is melted and fused. Alternatively, by applying a sizing agent only to the wavy top of the core material and performing gluing and bonding, stable adhesive fixing can be performed irrespective of other than the bonded portion.

Moreover, the induction roll does not separate and become overheated when the machine is stopped.

The cardboard thus obtained spreads over the entire surface of the thermoplastic synthetic resin such as a liner material, and shrinkage during cooling hardly occurs, so that a good quality cardboard can be manufactured without deteriorating the appearance.

(Example) Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows a case of basic one-sided cardboard manufacturing as a first embodiment of the apparatus according to the present invention. In the figure, (1) is a heat insulating roll, (2) is a guide roll, and (4) and (5) are machines. The direction changing rolls attached to the frame (3), (6) and (7) are members for adjusting the liner material (a) to and from the heating roll described later, which are cylinders.
(8) a pair of guide rolls that can be moved up and down,
(9) is related to the vertical movement of the induction roll as the speed increases and decreases, and the degree of contact of the liner material with the roll surface is increased when the speed is increased and is decreased when the speed is decreased, and the heating temperature of the liner material to be supplied is substantially changed. A heating roll that can be adjusted to a constant level, (10) is a smooth roll that forms a pressure contact bonding roll by pairing with a grooved roll (11), and the liner material (a) drawn from a liner material supply device (not shown) is kept warm. It was provided so that it could move up and down so as to separate from the liner material when the machine was stopped via the guide roll (2) from the roll (1), the direction change rolls (4) and (5) attached to the machine frame (3). Pair of induction rolls (6) (7)
Between the grooved roll (11) and the smoothing roll (10), which constitutes the joining roll from the heating roll (9). ing.

On the other hand, on the upper side, (12) is a grooved roll, (14) is a guide roll, (15) is a heating roll, these are the introduction side of the core material (b), the core material ( b) is the heating roll (1
5), through the guide roll (14), one side is the smooth heating roll
The liner material (a) is corrugated between a pair of heating grooved rolls (11) and (12) which are grooved rolls (11) paired with (10).
Smooth heating roll (11) and grooved roll (11)
Will be introduced during.

In the apparatus as described above, the grooved roll (11) has a corrugated corrugated top of at least the side of the core material (b) to be joined with the liner material as a main part of the present invention, which is made of the thermoplastic synthetic resin of the liner material. A heating device for heating to a temperature equal to or higher than the melting temperature, a heating roller (13) is arranged in a pair in the figure, and the corrugated corrugated top of the core material (b) is joined to the liner material (a). Prior to the above, it is configured to be heated above the melting temperature of the thermoplastic synthetic resin.

The heating roller (13) is a grooved roll (11) when the machine is stopped.
Since it is more detachable, the thermoplastic synthetic resin on the back surface of the core does not melt and adhere to the grooved roll (11).

Further, although not shown in the drawing, a paste tray is provided under the heating roller (13) to melt the room temperature glue or the thermoplastic synthetic resin and attach it to the wavy top of the core material to speed up the process. I am doing it. On the other hand, since the grooved roll (11) is provided with a space device in which the heat of the heating roller (13) is not conducted, it has almost no influence.

Of course, heating to the melting temperature or higher is not limited to the heating roller (13) in the figure, and an infrared heater or other device may be used.

In the introduction of the liner material (a) and the core material (b),
Each heating roll in the middle is a heating roll at an appropriate temperature that does not reach the melting temperature of the thermoplastic synthetic resin, and the liner material (a) and the core material (b) are appropriately kept in a heated state. The joint described later is smoothed.

Thus, in the device having the above configuration, the grooved roll (11)
And liner material introduced between the smooth heating roll (10)
(a) and the core material (b) are pressure-welded to each other between the rolls (10) and (11) to form a single-sided corrugated cardboard.As described above, the corrugated top of the core material (b) melts the resin. Since it is heated above the temperature, the thermoplastic synthetic resin (a ₁ ), moisture-proof aluminum layer (a ₂ ), paper layer (a ₃ ), the thermoplasticity of the paper layer surface from the outer surface side as shown in FIG. In the liner material (a) made of a synthetic resin (a ₄ ) (the inner and outer surfaces can be appropriately reversed and used), only the resin at the wavy top (c) with which the core material (b) contacts is melted.

Therefore, when the core material (b) has thermoplastic synthetic resin layers (ba) (b ₃ ) on both sides of the paper layer (b ₁ ) as shown in FIG.
At the wavy top of (b), the two are joined by the molten resin of the core material (b) and the molten resin of the liner material (a).

Thus, when the molten resin is discharged from both rolls (10) and (11) and cooled, the molten resin solidifies and becomes a state as shown in FIG.
The core material (b) and the core material are bonded and fixed to each other, and there is almost no influence on the resin of the wavy top portion (c) which is not in contact.

Incidentally, the above is the joining by the resin melting method using the wavy top heating of the core material by the heating roller (13), but the device of the present invention is not limited to the resin melting method as described above, but the room temperature glue or the resin. It is also possible to join by applying a sizing material such as a gluing agent only to the wavy top of the core material. In this case, a paste tray for accommodating the sizing agent is arranged below the heating roll (13), and the sizing agent is introduced between the pressure welding rollers.

When using normal cardboard or cardboard as the core material, it is effective to add the above-mentioned glue.

The guide rolls (17), the heating rolls (16), and the introducing rolls (18) and (19) shown by the two-dot chain line in FIG. 1 indicate other methods of introducing the liner material (a).

FIG. 3 shows a case where the one-sided cardboard is manufactured according to the above description, whereas the liner material (a) ′ is further formed on the other surface of the liner material of the one-sided cardboard sheet (A) manufactured in the step shown in FIG. Shows the device in the case of manufacturing as a double-sided corrugated cardboard, the single-sided corrugated cardboard sheet (A) manufactured is conveyed by the conveyor (21), while appropriately holding the pressing rolls (22) (23) while pressing. Pass the guide roll (24), preheating rolls (25) (26) (29), and guide rolls (27) (28) (30) to advance the single-sided cardboard sheet (A) to a new liner material bonding site. .

In this case, the preheating rolls (25), (26) and (27) are usually maintained at a temperature at which the thermoplastic synthetic resin of the liner material (a) is not melted, like the heating roll described above.

Immediately before reaching the bonding site, the single-sided cardboard sheet (A) melts the thermoplastic synthetic resin on the wavy top portion on the other surface side of the core material (b) to which the liner material (a) is not adhered. The heating roller (36) is brought into contact with the heating roller (36) in order to give the obtained temperature, and the wavy top portion is heated to a temperature higher than the resin melting temperature.

If the heating is insufficient, the hot plate (3
By 9), the temperature is further raised to bring the wavy top to a predetermined resin melting temperature or higher.

It should be noted that the heating roller (36) is provided with a glue applying device including a glue tray for sticking glue, like the heating roller (13) described above.

When the heating roller (36) and the heating plate (39) are unnecessary, the sheet
Cylinders (35) and (40) that should be separated from (A) enable vertical movement.

Thus, while the single-sided cardboard sheet (A) is fed by the above-mentioned device as above, a new backlining material, preferably a thermoplastic synthetic resin layer, a moisture-proof aluminum layer, a paper layer and the same as the liner material are used. The liner material (a) 'consisting of the thermoplastic synthetic resin layer on the layer surface is heated by the heating roll (31) (3
2) And as the speed increases or decreases, the contact area of the liner material to the roll is changed as appropriate, and the heating temperature of the liner material can be adjusted to be substantially constant. The corrugated top portion is sent to the joining portion while being kept in a heat-retaining state, and is pressed against the heated single-sided cardboard sheet (A) under the pressure of the pressure roll (41). At this time, the resin of the liner material (a) 'which is in contact with the liquid top is melt-bonded in the same manner as in FIG. 2, cooled by the subsequent cooling plate (42) and bonded integrally to obtain a double-sided cardboard.

According to the method of the present invention as described above, the moisture-proof sheet having the thermoplastic synthetic resin layered on both sides of the intermediate layer such as the moisture-proof aluminum layer is used as the liner material without causing any trouble in the core material, and the shrinkage deformation of the thermoplastic synthetic resin is caused. It is possible to efficiently manufacture the moisture-proof corrugated cardboard by joining them together without involving.

However, the device of the present invention is not limited to a sheet material having a moisture-proof aluminum layer as an intermediate layer, and a sheet material having a thermoplastic synthetic resin layer on both sides of an intermediate layer such as paper can be used and a cardboard can be effectively used. Can be manufactured.

In addition, in FIG. 3, when heating the side of the single-sided corrugated fiber core material to which the liner material is not joined, it is different from the moisture-proof sheet by applying a sizing agent only to the wavy top portion without heating. It is also possible to attach an ordinary sheet, which is included in the present invention.

(Effects of the Invention) The present invention provides a pressure contact bonding roll means for a liner material and a core material, which is composed of a pair of a smooth roll and a grooved roll heated as described above, and supplies and guides the liner material to smooth the surface. A pair of liner material supplying means for introducing a liner material along the roll between the joining rolls and the grooved roll of the joining roll means are paired and corrugated on the core material and along the grooved roll between the joining rolls. A device provided with a core material introducing means for introducing a core material, wherein the liner material supplying means at least increases the contact rate of the liner material with the roll surface as the supply speed increases or decreases. It comprises a heating roll that can be adjusted to a large value and a small value when it decreases and the heating temperature of the liner material can be adjusted to a substantially constant value, and an induction roll that allows the liner material to come into contact with and separate from the heating roll. Supply means Since it is configured to have at least a heating means for heating the corrugated top portion of the core material to be joined, the degree of contact between the heating roll and the liner material is increased when the liner supply speed is increased, as the speed is increased or decreased. When the machine is stopped, the induction roll is separated from the heating roll to prevent the liner material from overheating when the machine is stopped. hand,
Even when a sheet material having thermoplastic synthetic resin layers on both sides is used as a liner material, it is possible to smoothly produce cardboard without overheating and melting the thermoplastic synthetic resin on the surface. Which is extremely effective in the production of, at the time of joining, the wavy top of the core material is heated above the melting temperature of the resin to bond the liner material and the core material, and the resin at the contact site is fused, or Even if a sheet material having a thermoplastic synthetic resin layer is used, since the adhesive is applied only to the contact portion, even if a sheet material having a thermoplastic synthetic resin layer is used, the surface of the layer is contracted by shrinkage during cooling such as melting of the resin. It has a remarkable effect that a corrugated cardboard having a good appearance can be obtained without causing unevenness and deteriorating the appearance.

The invention according to claim 2 has the effect of simplifying the apparatus configuration and improving manufacturability by using a heating roll as the heating means.

Further, the invention according to claim 3 provides each of the effects as an apparatus for producing a double-sided cardboard, and enhances the practical effect.

In particular, the device of the present invention is suitable as a device for reusing the moisture-proof sheet containing the used moisture-proof aluminum without discarding it.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing one example of the manufacturing apparatus of the present invention, and FIG.
FIG. 1 is an enlarged view of the joint portion of FIG. 1, and FIG. 3 is a schematic outline view showing the double-sided cardboard manufacturing apparatus following FIG. (a) (a) ′ …… Liner material, (b) …… Core material, (c) …… Wavy top, (a ₁ ) (a ₄ ) …… Thermoplastic synthetic resin layer, (a ₂ )… … Moisture-proof aluminum layer, (a ₄ ) …… Paper layer,

Claims (3)

[Claims] 1. A pressure-bonding joining roll means for joining a liner material and a core material, which comprises a pair of a heated smooth roll and a grooved roll, and a liner material which is fed to guide the liner material along the smooth roll. A liner material supplying means to be introduced between the joining rolls and the grooved roll of the joining roll means are paired to corrugate the core material and introduce the core material between the joining rolls along the grooved roll. A device for joining a liner material at the corrugated corrugated top of the core material, which comprises a core material introducing means, wherein the liner material supply means supplies the supply speed to the front part of the smooth roll as the supply speed increases and decreases. A heating roll that can adjust the heating temperature of the liner material to a constant value by increasing the contact area with the roll surface when increasing and a small contact area when decreasing, and a mechanism that allows the liner material to contact and separate from the heating roll. And also in Cardboard manufacturing apparatus characterized by comprising a heating means for heating the corrugated top portion which is corrugated core material in which the timber feed means for joining. 2. The cardboard manufacturing apparatus according to claim 1, wherein the heating means for heating the corrugated top of the core material is a heating roll capable of coming into contact with and separating from a grooved roll constituting a joining roll. 3. A pressure-bonding roll means for joining a liner material and a core material, which comprises a pair of a heated smooth roll and a grooved roll, and a liner material which is fed to guide the liner material along the smooth roll. A liner material supplying means to be introduced between the joining rolls and the grooved roll of the joining roll means are paired to corrugate the core material and introduce the core material between the joining rolls along the grooved roll. A device for joining a liner material at the corrugated top of the core material provided with a core material introducing means, wherein the liner material supplying means increases the supply speed to the roll surface when the supply speed increases as the supply speed increases or decreases. It has a heating roll that can adjust the heating temperature of the liner material to a constant value by changing the contact area to a large value and decreasing it when it decreases, and a mechanism that allows the liner material to contact and separate from the heating roller. Core material to which material supply means is joined A means for feeding the liner material and the core material, which are joined to each other, which are connected to the cardboard manufacturing apparatus having a heating means for heating the corrugated top, and the liner material and the core material, which are interleaved. A means for supplying a second liner material to be joined to a surface opposite to the side where the liner material is joined and a means for joining the second liner material to a central material are additionally provided to the core material of the material. Characteristic cardboard manufacturing equipment.