JPH05305946A - Manufacture of sheet pallet - Google Patents

Abstract

PURPOSE:To provide slipperiness, water resistance and water repellency to a sheet pallet by a method wherein a coating agent is applied to one surface of a pulled out web made of paper, and is dried, and a web for lamination is joined to the other surface to form a composite web, and the composite web is cut into a sheet for pallet, and is formed into a pallet by providing specified ruled lines. CONSTITUTION:A paper web 112 is pulled out from a roll 110, and is made to pass through a gravure coater 120, and a coating layer with slipperiness, water resistance and water repellency, e.g. a wax, etc., is applied to the lower surface of the web 112. Then, an adhesive 138 is extruded from an extrusion die 136 and applied to the upper surface of the web 112 which is dried by passing through a drying device 130. Then, a second web 142 made of a plastic cloth which is made of a stretched body of polyethylene, etc., is let out from a second roll 140, and is placed on the top of the adhesive 138, and is pressed by a press unit 150 to stick the web 142 to the adhesive 138. The obtained article is cut into sheets 9. Specified ruled lines are provided on the sheet, and the sheet 9 is formed into a pallet 5 by bending a tab 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a sheet pallet, and more particularly to a method of manufacturing a sheet pallet consisting essentially of paper.

[0002]

2. Description of the Related Art Several sheet pallets consisting essentially of paper are known (for example, Japanese Utility Model Laid-Open No. 63-16112).
No. 9). However, since the sheet pallet is often dragged on the work place (usually the concrete floor surface) with the luggage still loaded, there is a problem that the paper layer, which is the lower surface of the sheet pallet, is easily damaged.

[0003] In the market or at a collection point, trucks directly enter for loading and unloading of luggage, so that in rainy weather, the floor surface in the market or at the collection point gets wet, and the paper layer absorbs the moisture and becomes strong. There was a problem that it deteriorated.

[0004]

Therefore, the present invention is to provide a method for producing a sheet pallet having a lower surface provided with a coating layer for imparting slipperiness and water resistance or water repellency.

[0005]

In the present invention, a coating layer is not provided on a sheet-shaped pallet, but a coating material is applied to one side of the winding web in the state of the winding web, and another coating is applied after drying. Manufacturing a sheet pallet having a coating layer on the lower surface by laminating webs to obtain a composite web, cutting the composite web into predetermined dimensions, and providing ruled lines for tab formation if necessary Can be done.
More specifically, a withdrawal step of withdrawing a first web made of paper from an unwinder, and a coating agent on the one surface of the withdrawn first web to form a coating layer on the one surface. A coating step of coating, a drying step of drying the coating agent, a lamination step of bonding a second web to the other surface of the first web to obtain a composite web, and the composite web to a predetermined length. A sheet pallet manufacturing method comprising: a cutting step of cutting to obtain a sheet.

The second web used in the present invention may be paper, like the first web, but may be plastic. When the plastic is used, for example, a fiber so-called flat yarn obtained by uniaxially stretching plastic such as polyethylene or polypropylene, a woven cloth, a biaxially stretched polyester film, or the like is preferable, but not limited thereto. In the printing industry, the web is translated into Japanese, such as roll paper, but it is not limited to paper and refers to cloth of indefinite length.

The paper used in the present invention is not particularly limited,
Considering availability and the like, corrugated cardboard base paper such as liner base paper, core base paper, and kraft paper can be used.

The unwinder applicable to the present invention is a concept including an unwinder used for printing, a mill roll stand used for corrugated board production, an uncoiler used for steel plates, etc. Is a means to do.

Various coaters such as a reverse roll coater, a knife coater, an air knife coater and a gravure coater can be used as a coating machine suitable for the method of the present invention.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail below with reference to one embodiment illustrated in the drawings, but it goes without saying that the present invention is not limited to this embodiment.

FIG. 1 is a perspective view showing a sheet pallet 5 manufactured according to the present invention, in which a tab 8 is integrally formed on a main body 7 via ruled lines 7. The number of tabs 8 is not limited to one, and two to four tabs can be provided on any side.

FIG. 2 is a partial cross-sectional view of a sheet pallet 5 made in accordance with the present invention, where reference numeral 10 is a first layer of paper, 20 is a second layer of plastic fiber cloth, and reference numeral 30. Is a coating layer for imparting slipperiness and water resistance or water repellency, and reference numeral 12 is an adhesive layer.

The paper for forming the first layer 10 is more preferably a kraft paper system, for example, a K liner for corrugated board, a so-called imported liner, or the like because the fibers in the paper quality are long and the tensile strength is large. When the exposed surface of the second layer 20 which is the upper surface of the sheet pallet 5 has an appropriate coefficient of friction, the load placed on the sheet pallet 5 becomes difficult to slip. It is convenient. The anti-slip agent may be applied to the upper surface of the sheet pallet 5.

The second layer 20 is a cloth layer in which warp yarns 21 and weft yarns 23 made of plastic fibers, which are so-called flat yarns, are plain-woven. This plastic fiber is made of polyethylene film, polypropylene film,
It can be obtained by uniaxially stretching a plastic film such as a polyester film 3 to 10 times.

In order to make the elongation of the first layer 10 made of paper in the plane direction equal to that of plastic fibers, for example, when high density polyethylene is used, it is uniaxially stretched 3 to 10 times. It is convenient. If the stretching ratio is less than 3 times, the elongation in the plane direction is still too large, and conversely 1
When stretched to 0 times or more, there is a disadvantage that the elongation rate becomes too small. The stretching ratio is more preferably 5 to 8 times so as to be almost the same as that of the paper.

The thickness of the flat yarn is preferably 500 to 2000 denier. If it is less than 500 denier, the yarn may be too thin and may be overheated in the lamination step, resulting in deterioration of crystallinity. If it is 2000 denier or more, the unevenness of the cloth layer may be large and the adhesion to the paper layer tends to be poor.

The adhesive layer 12 comprises the first layer 10 and the second layer 20 while extruding the adhesive composition into a film.
It is to be laminated (bonded) by interposing it between and. The higher the basis weight of the paper forming the first layer 10 is, the more preferable it is. However, when heated when adhering to the cross layer of the flat yarn (that is, the second layer 20), the higher the basis weight is, the higher the yarn becomes. The amount of heat increases, and the normally stretched yarn tends to return to a normal amorphous state. Therefore, the tensile strength of the second layer 20 deteriorates.

In order to avoid this problem, it is necessary to prevent the cloth layer serving as the second layer 20 from being excessively heated. In order to avoid overheating, this problem can be solved by, for example, increasing the laminating speed or reducing the amount of the adhesive composition extruded as much as possible. Further, when a modified product of various resins is added to the adhesive composition in an amount of 1 to 100% by weight, preferably 5 to 20% by weight, the adhesiveness with the cloth layer is improved, so that the heating amount is reduced. be able to.

When the cross layer is made of a stretched polyethylene, examples of the resin modified product that can be used for the purpose of adhesion include polyethylene derivatives such as a partially oxidized modified product of polyethylene and a maleic anhydride modified product of polyethylene, and maleic anhydride. Examples thereof include copolymers of acrylic acid and methacrylic acid with ethylene, and compositions containing two or more of these. When the cloth layer is formed of a plastic other than polyethylene, it is preferable to bond the cloth layer with a composition having a good affinity with the plastic and paper.

Reference numeral 30 is a coating layer, which is formed on the bottom surface of the sheet pallet 5 in order to impart slipperiness and water resistance or water repellency. Since the sheet pallet is sometimes placed in a place with a lot of water, it needs to have water resistance or water repellency. In addition, the sheet pallet is often dragged on the floor surface, and needs to have slipperiness with respect to the floor surface.

FIG. 3 shows an example suitable for manufacturing such a sheet pallet 5. Reference numeral 110 is a roll around which a first web 112 made of paper is wound. The web 112 is pulled out from the roll 110. A device that pulls out the roll 110 while holding it is usually called an unwinder. This web 11
The lower surface of 2 has a slippery and water-resistant or water-repellent coating layer 3
A coating 126 is applied to form a zero. The coating machine 120 is called a gravure coater in FIG. 3, and is a system in which the web 112 is passed between the gravure cylinder 122 and the impression cylinder 124.

The normal gravure coater is driven by a motor, but the gravure coater used in this embodiment does not need to be driven specifically. Since the web of the present invention has a tensile strength that can be used for a sheet pallet, the gravure cylinder 122 and the impression cylinder 124 can be rotated by pulling the web.

The coating agent contains a material that imparts slipperiness and water resistance or water repellency. Since the web consists mainly of paper, in order to prevent fire and other hazards, this coating agent is an aqueous emulsion or suspension,
It is preferably an aqueous liquid such as an aqueous solution. Incidentally, when a pigment or a dye is mixed in the coating agent, the coating layer 30 is colored and it is possible to easily determine which is the lower surface.

There are various materials for imparting slipperiness and water resistance or water repellency, and the following materials can be used. (1) Fats and oils (animal and vegetable fats and oils, mineral fats and oils) As a coating method, when the fats and oils are liquid, they may be applied as they are or as an aqueous emulsion. When it is a solid, it can be applied by heat melting. (2) Waxes (natural waxes such as plant wax, animal wax, mineral wax, petroleum wax, synthetic hydrocarbons, modified wax, synthetic waxes such as fatty acid amide, compounded wax containing these waxes) coating method Can be applied in the form of an aqueous emulsion or solution, or can be heat-melted for application. (3) Silicones (silicon oil, silicone resin)

The coated web 112 is
It is guided to the drying device 130 via the gravure coater 120. As the drying device 130, various types such as hot air, infrared rays, far infrared rays, electromagnetic waves, and thermal drums can be used.

An adhesive 138 is extruded from the extrusion die 136 and applied to the other surface, that is, the upper surface of the dried first web 112 to form the adhesive layer 12 in FIG.

On the other hand, the second web 142 made of a plastic cloth is pulled out from the roll 140 and reaches the press section 150 via the guide roll 144. The press section 1
50 is an upper press roll 152 and a lower press roll 154.
The second web 142 is laminated on the adhesive 138 by the pressing section 150 to form a composite web 156. The composite web 156 has the structure shown in FIG.

The composite web 156 is cut into a predetermined length by the cut-off device 160. This dimension is measured by the measuring roll 164 which measures the traveling distance while contacting the web 156 as the composite web 156 passes over the guide roll 162. The length measurement signal measured by the measuring roll 164 actuates the cutting blade 166 via an electronic control unit (not shown). Thus, the sheet 9 having an arbitrary length can be obtained.

The sheet 9 thus obtained is formed into a sheet pallet 5 by forming ruled lines 7 and tabs 8 as required as shown in FIG. The ruled lines 7 can be formed simultaneously with slitting, for example, in a slitter scorer used in a corrugated board factory. When printing on the upper surface of the sheet pallet 5, for example, a sheet-fed printing machine used in a corrugated board factory can be used. Further, the sheet-fed printing machine can also be used when it is desired to perform anti-slip treatment on the upper surface. For example, anti-slip treatment can be performed by applying an emulsion of ethylene / vinyl acetate in a required pattern on a printing plate simultaneously with printing.

[0030]

As described above, the present invention has a roll-shaped first structure.
The coating layer having slipperiness and water resistance or water repellency can be easily formed on the web 112. When a uniaxially stretched flat yarn cloth is used as the second web 142, since the coating layer is provided before bonding with the first web 112, the cloth is not heated more than necessary, and There is an advantage that there is little risk of strength deterioration.

Although the second web 142 is a flat yarn cloth in the above embodiment, the material is not limited to this, and paper, plastic film or the like may be used. If the second web 142 is paper, the adhesive 1
38 is not limited to coating by the extrusion die 136, but may be of another type such as a reverse roll coater or a gravure coater. In this case, the adhesive may be a liquid adhesive such as an emulsion type or an aqueous solution type.

[Brief description of drawings]

FIG. 1 is a perspective view of a sheet pallet manufactured by the method of the present invention.

FIG. 2 is a partial cross-sectional view of the sheet pallet of FIG.

FIG. 3 is a schematic view showing an example of an apparatus suitable for carrying out the method of the present invention.

[Explanation of symbols]

 5 sheet pallet 6 main body 7 ruled line 8 tab 9 sheet 10 first layer 20 second layer 21 warp yarn 23 weft yarn 30 coating layer 110 first roll 112 first web 120 gravure coater 122 gravure cylinder 124 impression cylinder 126 coating agent 130 Drying device 136 Extrusion die 140 Second roll 142 Second web 144 Guide roll 150 Press part 152 Upper press roll 154 Lower press roll 156 Composite web 160 Cut-off device 162 Guide roll 164 Measuring roll 166 Cutting blade

Claims (3)

[Claims] 1. A drawing step of drawing a first web of paper from an unwinder; and a coating agent on one side of the drawn first web to form a coating layer on the one side. A coating step of coating, a drying step of drying the coating material, a lamination step of bonding a second web to the other surface of the first web to obtain a composite web, and the composite web to a predetermined length. A sheet pallet manufacturing method, comprising: a cutting step of cutting to obtain a sheet. 2. The manufacturing method according to claim 1, further comprising a scoring step of forming a tab by providing a ruled line on one side or two or more sides of the sheet. 3. The method according to claim 1, wherein a pigment or a dye is mixed in the coating agent.