JPH06155581A - Manufacture of laminated material - Google Patents

Abstract

PURPOSE:To provide a method for manufacture of a laminated material which can prevent a base material sheet from being thermally damaged without providing a skin material for cooling separately when hot melt is applied to the base material sheet even in the case where a melting point or a softening point of the base material sheet is lower then a melting temperature of a hot melt adhesive or a pressure sensitive adhesive. CONSTITUTION:When a melted hot melt adhesive or a pressure sensitive adhesive 5 is applied to a band like base material sheet 4 having a melting point or a softening point equivalent to or lower than a melting point of the hot melt adhesive or the pressure sensitive adhesive 5, it is applied in a belt like manner to the whole upper surface of the base material sheet 4 without providing a method for allowing to cool while the base material sheet 4 is being moved at a line speed exceeding 5m/min.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a laminate using a hot-melt adhesive or pressure-sensitive adhesive, and more specifically, a hot-melt adhesive or pressure-sensitive adhesive is applied to a foamed polyethylene sheet having a low melting point or a softening point. And a method for manufacturing a laminate.

[0002]

2. Description of the Related Art Conventionally, for example, in a bath mat or an entrance mat, foamed polyethylene sheets or the like are bonded to each other by heat, or a skin material is adhesively laminated on the foamed polyethylene sheet or the like by using heat or an adhesive or an adhesive. It was manufactured. Also, for interior materials such as automobile ceilings and doors, there are known examples in which a core material such as resin felt, glass board, corrugated board, etc. and a skin material lining a fiber or vinyl chloride leather with foamed polyethylene etc. is adhesively laminated. Has been.

Solvent-type or emulsion-type adhesives are used in lamination processes other than the heat-bonding of the foamed polyethylene sheet and the skin material.

However, in the above solvent type adhesive,
Since it contains an organic solvent, it may cause problems in the working environment and pollution problems. Also, in the case of an emulsion type adhesive, there is a problem of pollution such as requiring wastewater treatment.

Further, since the solvent-type or emulsion-type adhesive needs to be coated by using a roll coater, a knife coater, a blade coater, etc., the coating amount per unit area is large, and therefore the working speed is high. The line speed of the material is as slow as 3 to 5 m / min, and there is a drawback that the production efficiency is poor.

Further, a solvent-type or emulsion-type adhesive requires a drying step after coating, and there is a problem that a facility cost is large when a drying oven is provided.

[0007] Therefore, there is a demand for a method for producing a laminated body which is free from the problems of working environment and pollution caused by the adhesive, and does not require wastewater treatment.

There is also a demand for a method for producing a laminate which is excellent in production efficiency and has a low facility cost burden.

As a result of intensive studies to satisfy the above demands, the present inventor has tried to apply a molten hot melt adhesive or pressure sensitive adhesive to a base sheet, but the melting point or softening point of the base sheet is Since the temperature is lower than the melting temperature of the hot-melt adhesive or pressure-sensitive adhesive, there is a problem that the base sheet is thermally damaged by the melted hot-melt adhesive or pressure-sensitive adhesive.

For this reason, a method is conceivable in which the skin material is immediately laminated and cooled immediately after being applied in the form of a thin thread in order to increase the cooling rate of the hot melt adhesive or pressure sensitive adhesive.
If a separate cooling means is provided, not only will the equipment cost increase, but in the case of applying a thin thread-like method to a base material sheet having a strip shape, there are parts where adhesive is present and parts where no adhesive is present. There is a problem that reduces value,
Further, the linear bonding has a problem that the bonding strength is weak and the commercial value is lowered.

[0011]

Therefore, an object of the present invention is to apply hot-melt coating to a base sheet even when the melting or softening point of the base sheet is lower than the melting temperature of the hot-melt adhesive or pressure-sensitive adhesive. In this case, it is an object of the present invention to provide a method for manufacturing a laminate, which can prevent heat damage to the base sheet without separately providing a skin material for cooling.

[0012]

Means for Solving the Problems The inventors of the present invention have completed the present invention as a result of continuing studies to solve the above problems.

That is, the method for producing a laminate according to the present invention is
When the molten hot-melt adhesive or pressure-sensitive adhesive is applied to a belt-shaped substrate sheet having a melting point or softening point equal to or lower than the melting temperature of the hot-melt adhesive or pressure-sensitive adhesive, the substrate sheet Is moved at a line speed exceeding 5 m / min, and is applied in strips on the entire upper surface of the base sheet without providing cooling means.

Further, in a preferred aspect of the present invention, the base sheet is a foamed polyolefin sheet or a foamed polystyrene sheet.

In another preferred embodiment of the present invention, the substrate sheet is 10 m / min to 100 m / mi.
To move at a line speed of n.

The present invention will be specifically described below.

As the hot-melt adhesive or pressure-sensitive adhesive used in the present invention, a commercially available hot-melt adhesive or pressure-sensitive adhesive may be appropriately selected and used depending on the required physical properties depending on the application.

The melting temperature of the hot-melt adhesive or pressure-sensitive adhesive varies depending on the viscosity, but since it is about 120 to 190 ° C., the melting point or softening point of the base sheet is equal to or lower than that, and preferably. Is 50 to 100 ° C. lower than the melting temperature of the hot melt adhesive or pressure sensitive adhesive.

The base material sheet used in the present invention may be a crosslinked or non-crosslinked polyolefin sheet or polystyrene sheet, and is preferably a non-crosslinked expanded polyolefin sheet or expanded polystyrene sheet. Examples thereof include a polyethylene sheet and a foamed polypropylene sheet.

The shape of the base sheet may be a band,
The length is not particularly limited (for example, 50 m).

To apply the hot-melt adhesive or pressure-sensitive adhesive to the strip-shaped base sheet, for example, a hot-melt applicator is used. The hot melt applicator has at least a hopper filled with an adhesive in a molten state under heating, a coating nozzle, and a pump for transferring the molten adhesive from the hopper to the coating nozzle.

When the hot-melt adhesive or pressure-sensitive adhesive is extruded into a sheet, the base sheet is moved at a line speed exceeding 5 m / min, and at that time, a skin material for cooling is not provided. It is a feature of the present invention that the entire surface of the upper surface of the base sheet is coated in a strip shape.

That is, when it is less than 5 m / min,
Since it is the same speed as the coating speed of conventional solvent-based adhesives,
There is a problem that the work efficiency is poor and the base sheet is thermally damaged by the melted hot melt adhesive or pressure sensitive adhesive.

Further, since it is not necessary to provide a skin material for cooling the material at the same time as coating, and the time of adhering the skin material can be freely selected, the range of work is widened (for example, primer processing can be performed), and workability is improved. Can be achieved.

The laminate obtained by the production method of the present invention is a base sheet / hot-melt adhesive or pressure-sensitive adhesive (eg so-called primer processed product), base sheet (a) (eg expanded polyethylene sheet)
/ Hot melt adhesive or pressure-sensitive adhesive / Substrate sheet (b)
(For example, cardboard, corrugated plastic, paper, fiber, cloth, plastic film sheet, etc.), base sheet (a) (for example, paper, plastic film sheet, etc.) / Hot melt adhesive / base sheet (expanded polystyrene) / hot Examples thereof include melt adhesive / base material sheet (a).

In the present invention, the preferable line speed of the base sheet is 10 to 100 m / min in the so-called primer processing, and 10 m / min to 30 m in the so-called lamination processing.
The range of / min is preferable. In this way, by achieving a coating speed far exceeding the coating speed of conventional solvent-type or emulsion-type adhesives or pressure-sensitive adhesives,
The object of the present invention can be achieved more effectively.

Next, an example of a hot melt applicator for producing the laminate of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is an explanatory view showing an example of a hot melt applicator. In FIG. 1, 1 is a hopper filled with an adhesive in a molten state. The hopper 1 is heated by, for example, a heater.

Reference numeral 2 denotes a coating nozzle, which is provided with a slit mouthpiece (not shown) at its tip and is formed so that a hot-melt adhesive or pressure-sensitive adhesive can be extruded into a sheet shape. The slit width of the slit base is not particularly limited, but is 0.3 to
0.6 mm is preferable.

Reference numeral 3 is a pump for transferring the molten adhesive from the hopper 1 to the coating nozzle 2. Pump 3
For example, a gear pump or the like having a predetermined discharge pressure is used.

The line extending from the hopper 1 to the coating nozzle 2 and the pump 3 are preferably heated or kept warm to maintain the molten state of the resin.

The hot-melt adhesive or pressure-sensitive adhesive supplied to the coating nozzle 2 is extruded by the pump pressure onto the moving base sheet 4 to form the hot-melt adhesive layer 5. At this time, when a slit mouthpiece is used at the tip of the nozzle, it is extruded in a sheet shape. The coating amount can be increased according to the pump capacity, hopper capacity, etc.
The coating width can be adjusted by changing the surface length of the slit mouthpiece.

[0033]

EXAMPLES Examples of the present invention will be given below, but the present invention is not limited to the examples.

Example 1 On a non-crosslinked polyethylene sheet (softening point 60 to 70 ° C.) having a thickness of 0.5 mm and a width of 300 mm, a hot melt adhesive or tackiness agent at 140 ° C. was applied with a gear pump at 78 g / min.
The amount of.

The coating nozzle has a groove width of 0.3 mm × 300 m
A m base was used. The line speed of the non-crosslinked polyethylene sheet was set to 20 m / min.

As a result, the non-crosslinked polyethylene sheet is damaged.
Coating amount 13g / m without scratching ²Adhesive processed sheet
Got

Example 2 The same procedure as in Example 1 was repeated except that the thickness of the non-crosslinked polyethylene sheet was changed to 1.0 mm and the line speed of the non-crosslinked polyethylene sheet was changed to 10 m / min.

As a result, an adhesive processed sheet having a coating amount of 26 g / m ² was obtained without damaging the non-crosslinked polyethylene sheet.

Example 3 The non-crosslinked polyethylene sheet of Example 1 was replaced with a foamed polypropylene sheet (softening point 140 ° C.) and glued at a line speed of 20 m / min in the same manner as in Example 1.

As a result, in the same manner as in Example 1, an adhesive processed sheet having a coating amount of 13 g / m ² was obtained.

Example 4 The non-crosslinked polyethylene sheet of Example 1 was replaced with a foamed polystyrene sheet (10-fold foamed product having a softening point of 90 ° C.) and glued at a line speed of 20 m / min in the same manner as in Example 1.

As a result, the same result as in the case of Example 1 was obtained.

[0043]

According to the present invention, even when the melting point or softening point of the base sheet is lower than the melting temperature of the hot-melt adhesive or pressure-sensitive adhesive, a separate cooling is required when applying the hot-melt to the base sheet. It is possible to provide a method for manufacturing a laminate that can prevent heat damage to a base sheet without providing a skin material for the above.

Further, since it is not necessary to provide the skin material for cooling the material at the same time as the application, and the time of adhering the skin material can be freely selected, the range of work can be expanded (for example, primer processing can be performed), and workability can be improved. Can be achieved.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an example of a hot melt applicator.

[Explanation of symbols]

 1 Hopper 2 Coating Nozzle 3 Pump 4 Base Sheet 5 Hot Melt Adhesive or Adhesive Layer

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location // B29K 23:00 B29L 9:00 4F

Claims (3)

[Claims] 1. When applying a molten hot-melt adhesive or pressure-sensitive adhesive to a strip-shaped substrate sheet having a melting point or softening point equal to or lower than the melting temperature of the hot-melt adhesive or pressure-sensitive adhesive. , The base material sheet at 5 m / min
A method for producing a laminated body, characterized in that the coating is applied in a strip shape on the entire upper surface of the base material sheet while moving at a line speed exceeding the above, without providing a cooling means. 2. The method for producing a laminate according to claim 1, wherein the base sheet is a foamed polyolefin sheet or a foamed polystyrene sheet. 3. The substrate sheet is 10 m / min to 100
The method for producing a laminate according to claim 1, wherein the laminate is moved at a line speed of m / min.