JP3111429B2 - Method and apparatus for manufacturing thermoplastic laminated paper having non-laminated side edges - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermoplastic resin laminated paper, and more particularly to the production of a thermoplastic resin laminated paper having no thermoplastic resin layer on its edge so as to be convenient for lamination during bag making. The present invention relates to a method and its apparatus.

[0002]

2. Description of the Related Art Thermoplastic resin laminated paper in which a thermoplastic resin is laminated on one or both sides of a base paper to impart strength against water resistance, tearing and elongation is widely used in shopping bags in department stores, book covers and posters. Used in various fields. However, since the surface of this thermoplastic resin laminated paper is a resin layer unlike paper, it is not easy to bond it during bag making and to adhere it to other sheets. Often needed.

[0003] In particular, in the case of bag making, since a trader in this field already has a device for manufacturing paper bags from general paper, coated paper, bleached kraft paper, etc., it is necessary to apply the device directly to this device. It is desirable to supply a thermoplastic resin laminated paper that can be used. For this reason, when the thermoplastic resin layer 2 is provided on one side of the base paper 1 as shown in the perspective view of the shopping bag in FIG. The side edge 36 to be glued does not need to be processed because the back side remains the base paper, but the side edge 37 to be glued to the front side is provided with the thermoplastic resin layer 2 at the boundary 38. Not been.

As described above, there are the following two methods for exposing the base paper without providing the resin layer at the edge portion corresponding to the margin portion of the thermoplastic resin laminated paper.

The first method is to control the film width of the extruded resin to be smaller than the width of the base paper in the extrusion laminating method, and the second method is to control the film width of the extruded resin in the dry laminating method.
In this method, a resin film formed in advance to be narrower than the base paper is bonded to the base paper.

[0006]

In the case of the first extrusion laminating method among the above-mentioned conventional methods, when the molten film of the resin falls from the T-die, both ends shrink toward the center due to surface tension. As a result, the thickness of the resin layer laminated on the base paper also has a disadvantage that both edges in the width direction are thicker than the center. As a countermeasure, measures such as reducing the neck-in by the type and composition of the resin and narrowing the opening at both edges of the slot of the T-die have been adopted, but the types of resin usable by these means are as follows. In addition, it is difficult to make both ends of the resin layer straight. In addition, the second dry lamination method requires a step of manufacturing a resin film in advance, so that the equipment must be large-scale and disadvantageous in cost.

Therefore, the present invention can be used irrespective of the type of resin, and has a uniform thickness of the resin layer, and a clean straight line at the end of the resin layer which is a boundary with the exposed side edge of the base paper. It is an object of the present invention to provide a method for producing a thermoplastic resin laminated paper having a shape and a production apparatus therefor.

[0008]

SUMMARY OF THE INVENTION The present invention is based on the premise that a neck-in may occur so that any kind of thermoplastic resin can be applied to an extrusion laminate. It has been conceived as a result of examining a method of removing a portion and simultaneously forming a non-laminated portion on a side edge portion of the base paper.

That is, in the method for producing a thermoplastic resin laminated paper according to the present invention, a masking tape is placed on a base paper that is unwound from a winding and runs so as to continuously cover a predetermined side edge thereof. Thereafter, a thermoplastic resin in a molten state extruded from a T-die is laminated on the base paper and the masking tape such that the side ends of the resin layer are located within or beyond the width of the masking tape. Then, the thermoplastic resin layer is cut along substantially the side edge of the masking tape on the center side of the base paper, and the masking tape on which the side edges of the thermoplastic resin layer are laminated is removed.

Further, the masking tape has a contact surface with the base paper which has no adhesiveness, and separates the base paper and the masking tape into wedges when cutting the thermoplastic resin. It is characterized by inserting a knife from the space. Further, the masking tape is an endless belt or a winding tape.

Further, the manufacturing apparatus according to the present invention comprises a traveling device comprising a group of rolls for traveling the base paper unwound from the winding, and a side above the traveling device and continuously with respect to the base paper. A tape supply device for placing a masking tape so as to cover an edge portion, and an extrusion device that straddles both the running base paper and the masking tape and drops a thermoplastic resin on them as a coating in a molten state. A cooling device comprising a cooling roll and a nip roll which are opposed to each other, rotate under the pressure and cool the thermoplastic resin on the base paper under pressure, and a substantially side end of the masking tape at the center side of the base paper. A cutting device for cutting the thermoplastic resin layer along the
A device for removing the masking tape from the upper surface of the base paper.

In the present invention, high-quality paper, medium-quality paper, art paper, coated paper, kraft paper, roll paper, etc. are used as the base paper.
It is used as appropriate according to the application, and is not particularly limited.

Further, as the thermoplastic resin to be laminated,
Examples include polyethylene, polypropylene, polycarbonate, polyvinyl acetate, polymethyl methacrylate, and polyvinyl chloride.These resins include various fillers for the purpose of improving writability, antistatic and the like, for example, calcium carbonate,
Magnesium carbonate, titanium oxide, silica, barium sulfate and the like can be added.

Further, the thermoplastic resin layer covering the base paper comprises:
The coating is not limited to a single-layer extrusion, and may be a two or more-layer coating by coextrusion. In this case, the type of resin for each layer,
The thickness, the presence / absence of the filler, the type and the amount thereof can be different. The thermoplastic resin layer may be provided on both front and back surfaces of the base paper.

As the masking tape, a take-up tape and an endless belt are used, all of which are placed on the side edges of the base paper and then laminated with a thermoplastic resin. The winding tape may be made of paper, cloth, a heat-resistant film, or the like, and may be provided with a weak adhesive layer that is easy to peel off on the contact surface with the base paper, if necessary. These winding tapes are discarded in a state where the thermoplastic resin is kept laminated, or the resin is peeled off and reused. On the other hand, the endless belt is a belt made of metal or synthetic resin and formed endlessly. This endless belt is preferably used while applying a Teflon process to the surface or continuously applying a release agent such as silicon so that the laminated resin layer can be easily peeled off. There is an advantage that the length is not restricted.

As a means for cutting the resin layer, there is a method in which the surface of the resin layer is cut with a knife or a hot blade, or a laser beam for fusing is applied. Is not always constant, it is desirable to insert a knife between the base paper and the masking tape to cut the resin layer from the back side.

[0017]

According to the present invention, the width of the thick portion 7 where the resin film appears in a hill on the side edge of the base paper due to the neck-in or the width of the margin portion of the base paper After correspondingly positioning the masking tape and laminating the resin film in this state, since only the resin layer is cut along the side edges of the masking tape, the resin layer laminated on the masking tape is removed. A portion of the base paper can be exposed.

Further, when cutting only the resin layer, the base paper and the masking tape can be separated from each other in a wedge shape and a knife can be inserted from the wedge-shaped space. In this method, since the knife cuts into the resin layer not obliquely but vertically, the cut surface of the resin layer becomes a slope that gradually descends toward the exposed base paper. For this reason, troubles due to a sudden change in thickness do not occur in the bag making process.
Further, if the masking tape is an endless belt, there is no need to change the tape as in the case of the winding tape, and there is no restriction on the continuous operation time.

If a winding tape is used as a masking tape and collected, the working environment is not scattered, and the tape can be reused by winding the tape.

[0020]

Next, an embodiment of the present invention will be described with reference to the drawings. 1 is an explanatory view showing an embodiment using a winding tape as a masking tape, FIG. 2 is an explanatory view of a thermoplastic resin layer cutting / recovering portion of FIG. 1, and FIG. 3 is a sectional view taken along line AA of FIG. It is. In FIG. 1, guide rolls 10, 11, and 12 guide a running base paper 1 in a direction indicated by an arrow by a driving device (not shown). The small-diameter guide rolls 3 corresponding to the side edges 5 of the base paper 1 are provided on the running path of the take-up tape 3 unwound from the small take-up 31 so as to match the running direction of the base paper 1.
2, 33, 34 are provided. The small-diameter guide roll 34 pushes down the winding tape 3 in the direction of the base paper 1, and is positioned so as to cover the side edge 5 of the base paper 1 on the peripheral surface of the guide roll 10. The T-die 20 is a device for dropping a hot-melted thermoplastic resin film 21 in a curtain shape. At this time, the side end of the coating 21 is located within or beyond the width of the winding tape 3, and the thick portion 7 of the coating 21 due to the neck-in is wound on the winding tape 3. It is located so that it is located above or beyond. The thick portion 7 is formed on both side edges of the coating 21, but in this embodiment, only one is removed, and the other thick portion is laminated on the base paper as it is, and is removed as a cutting piece when cutting the laminated paper.

Next, a cooling device comprising a cooling roll 22 and a nip roll 23 is provided below the T-die 20, and the winding tape 3 and the thermoplastic resin film 21 are placed thereon. The base paper 1 is sandwiched between the two rolls, and the resin film is cooled while being pressed. Guide roll 1
The resin film 2 is laminated on the upper surface of the base paper 1 separated from the cooling roll 22 at 1 to form a thermoplastic resin laminated paper, and the base paper 1 is pressed by the resin film 2 so as to be pressed down. The winding tape 3 is placed on the side edge 5. Guide roll 1 for thermoplastic resin laminated paper
2 and then the knife 25 as shown in FIGS.
Is cut along the side edge of the winding tape 3. The knife 25 is inserted between the base paper 1 and the winding tape 3 during the test operation of the apparatus according to the present invention, and the resin film 2
Is fixed at the cutting position, the resin film 2 can be cut continuously by running the thermoplastic resin laminated paper during operation. Further, if the forced separation device 27 is installed together with the knife 25 to separate the winding tape 3 and the base paper 1 in a wedge shape and then cut the resin film 2, workability is good. As the forced separating device 27, a device in which rolls are attached to the respective ends of a "-" shaped shaft is effective. A suction pipe 26 is provided near the knife 25, and the base paper 1
Then, the winding tape 3 which is continuously cut and separated from the substrate and the side edges of the resin film 2 are laminated is drawn in.

In this way, a desired thermoplastic resin laminated paper, that is, a laminated paper having no thermoplastic resin layer laminated on the side edge portion 5 can be obtained.

Next, another embodiment of the present invention will be described. FIG. 4 is an explanatory view showing an embodiment using an endless belt as a masking tape, and FIG. 5 is an explanatory view of a thermoplastic resin layer cutting / recovering portion in FIG.

4 and 5, in comparison with FIG.
The masking tape is transferred from the winding tape 3 to the endless belt 6,
Further, it is basically the same except that the means for cutting the thermoplastic resin layer is changed from the knife 25 to the laser fusing device 28.
That is, the endless belt 6 is made up of the small-diameter guide rolls 41, 42, 4
3, 44, 45, the nip roll 23, the cooling roll 22, and the guide rolls 11, 12. The small-diameter guide roll 45 of the above-mentioned roll group adjusts the position of the endless belt 6 with respect to the side edge portion 5 of the base paper 1, and the endless belt 6 moves with respect to the peripheral surface of the guide roll 10. It is arranged so that it may be pressed lightly with 1 in between.

After being pressed against the base paper 1, the endless belt 6 is covered with a molten film 21 of resin flowing down from the T-die 20 together with the exposed surface of the base paper 1 not covered by the endless belt 6. The surface covered with the molten film 21 is cooled under pressure between the cooling roll 22 and the nip roll 23 to form the resin film 2. Thereafter, the base paper 1, the endless belt 6, and the resin film 2 travel integrally, and after passing through the guide rolls 11 and 12, the resin film 2 is cut along the side end of the endless belt 6 by the laser fusing device 28. I do. In this cutting, the output of the laser is adjusted, and only the thickness of the resin film 2 is cut without damaging the base paper 1.

The side edge of the cut resin film 2 is
6, separated from the endless belt 6, sucked,
The endless belt 6 continues the predetermined running.

FIGS. 6, 7, 8 and 9 are sectional views showing examples of the arrangement of the masking tape (winding tape) and the side edges of the resin film on the side edges 5 of the base paper 1. . First, in FIG. 6, the winding tape 3 is aligned with the side edge 5 of the base paper 1, and the thick part 7 formed on the side edge of the resin film 2 is laminated so as to protrude from the winding tape 3. I have. This example is a case where the width L of the non-laminated portion matches the width of the winding tape 3. Next, in FIG. 7, the take-up tape 3 is placed so as to protrude from the side edge portion 5 of the base paper 1, and
The thick portion 7 is laminated so as to protrude from the portion. This example is effective for removing the relatively thick portion 7 with the narrow winding tape 3 when the width L of the non-laminated portion of the base paper 1 is small. It is desirable that an adhesive layer that can be easily peeled off is provided on the contact surface with the base paper 1. FIG. 8 is a modification of FIG. 6 and FIG. 9 is a modification of FIG. 7, in which the thick portion 7 of the resin film 2 does not protrude from the top of the winding tape 3 but fits within the tape width. Only differ. In these examples, there is no possibility that the nip roll 23 is stained.

[0028]

The present invention is configured as described above.
It is easy to provide a part where the resin is not laminated on the side edge of the thermoplastic resin laminated paper, and since the cutting means is fixed, the cut surface is straight and the width of the non-laminated part is a constant finish. Gluing in post-process bag making, etc.
Good workability for bonding. Further, since the influence of neck-in occurring in the molten resin film can be eliminated, any thermoplastic resin according to the required quality of the laminated paper can be used.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a manufacturing process according to an embodiment of the present invention.

FIG. 2 is an enlarged explanatory view of a cutting / suctioning step in FIG. 1;

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is an explanatory view showing a manufacturing process according to another embodiment.

FIG. 5 is an enlarged explanatory view of a cutting / suctioning step in FIG. 4;

FIG. 6 is a cross-sectional view showing an example of a positional relationship among a side edge of a base paper, a masking tape, and a resin film.

[Fig. 7]

[Fig. 8]

[Fig. 9]

FIG. 10 is a perspective view of a product using the thermoplastic resin laminated paper of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Base paper 2 Thermoplastic resin layer 3 Winding tape 6 Endless belt 20 T-die 22 Cooling roll 25 Knife 26 Suction device 28 Laser device for fusing 32, 33, 34, 41, 42, 43, 44, 45
Small diameter guide roll

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B29D 9/00 B32B 27/12 B32B 31/18

Claims (5)

(57) [Claims] 1. A masking tape is placed on a base paper which is unwound from a winding and runs so as to continuously cover a predetermined side edge thereof, and then a molten thermoplastic resin extruded from a T-die is removed. And laminating on the base paper and the masking tape such that the side end of the resin layer is located within or beyond the width of the masking tape, and then the side end of the masking tape substantially at the center side of the base paper Cutting the thermoplastic resin layer along the line to remove the masking tape on which the side edges of the thermoplastic resin layer are laminated, the method for producing a thermoplastic resin laminated paper having a non-laminated portion at the side edges. . 2. The masking tape has a contact surface with a base paper that has no adhesiveness, and the base paper and the masking tape are separated from each other in a wedge shape when the thermoplastic resin is cut. 2. The method according to claim 1, wherein a knife is inserted from the space. 3. The method according to claim 1, wherein the masking tape is an endless belt. 4. The method for producing a thermoplastic resin-laminated paper according to claim 1, wherein said masking tape is a take-up tape. 5. A traveling device comprising a group of rolls for traveling the base paper unwound from winding, and a masking tape above the traveling device so as to continuously cover a side edge of the base paper. A tape supply device on which the thermoplastic resin is placed, an extruder that straddles both the running base paper and the masking tape, and drops the thermoplastic resin onto them in a molten coating, and an extruder below the extruder. A cooling device consisting of a cooling roll and a nip roll, which rotate in opposition to cool the thermoplastic resin on the base paper under pressure, and a thermoplastic resin layer along substantially side edges of the masking tape on the center side of the base paper. An apparatus for manufacturing a thermoplastic resin laminated paper having a non-laminated portion on a side edge portion, comprising a cutting device for cutting and a device for removing the masking tape from the upper surface of a base paper.