JPH07100898A - Manufacture of thermoplastic resin laminate - Google Patents

Abstract

PURPOSE:To manufacture a laminate with good productivity in a known resin sheet manufacturing device by inserting a sheet-shaped material prepared separately into a space between two rolls from a second roll afterwards of a roll unit. CONSTITUTION:Molten resin formed into the sheet shape in the foregoing stage is inserted into a space between a first roll and a second roll of a finishing roll unit, where the thickness of sheet-shaped resin is formed in a given thickness. A resin well called a bank is formed at an inlet of a space between the first and second rolls. A sheet-shaped material prepared separately is inserted from one site in the space between two rolls from the second roll afterwards of the finishing roll to manufacture a laminate of double layer structure. When the sheet-shaped material is inserted from two sites in the space, a laminate of triple layer structure can be manufactured. Thus laminates can be manufactured with good productivity by using a conventional thermoplastic resin sheet manufacturing device in general. Also a multiple functional laminate can be manufactured by using a multiple functional sheet-shaped material for the laminate.

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 laminated board using a thermoplastic resin as a base material.

[0002]

2. Description of the Related Art Conventionally, as a method for producing a resin laminated plate using a roll, a plurality of layers to be laminated are extruded as separate streams of molten resin by separate extruders, and the layers are laminated to form a laminated sheet. Extruder molding method; Extrusion lamination method in which a substrate of paper, aluminum foil, cellophane, plastic film, etc., that has been pre-wound, is unwound and the molten resin layer extruded from the extruder is superposed on it. There is a method of laminating the layers by an adhesive or by a heat press.

[0003]

In the coextrusion method, although each layer to be laminated can be a different type of layer,
One layer itself can only be applied with a layer of a single composition.

The extrusion lamination method is suitable for a laminated body composed of a thin resin sheet-like material on a thin base material, and cannot be applied to a thick one, since the wound base material is wound on a delivery roll.

The method of laminating a plurality of layers prepared in advance with an adhesive or a hot press has many steps and is complicated and the productivity is low.

Therefore, the present invention uses a well-known resin sheet manufacturing apparatus, the thickness of the base material can be arbitrarily adjusted, the other material to be laminated can also have various compositions, and the adhesive strength is large. Provided is a method for manufacturing a laminate having high productivity.

[0007]

According to the present invention, when a molten thermoplastic resin is manufactured into a resin sheet through three or more finishing roll units, the gap between the second and subsequent rolls of the roll unit is The method for producing a thermoplastic resin laminate is characterized in that sheet-like materials prepared in advance are sandwiched.

As the thermoplastic resin in the present invention, a resin which can be plastically worked by heating such as acrylic resin, polycarbonate, styrene resin, vinyl chloride resin, polyolefin, polyester, polyacetal, fluorine resin, polyamide is applicable. . One of the layers constituting the desired laminate may be selected from these.

As a method for producing a resin sheet from the molten thermoplastic resin of the present invention through three or more finishing roll units, a well-known representative of producing resin plates, sheets and films (hereinafter sheets). Method. For example, "Handbook of Plastic Processing Technology" (October 20, 1979)
Nikkan Kogyo Shimbun) pages 254-260: "Plastic sheet extrusion technology" (May 29, 1969, Industrial Research Board): "Plastics" vol.3
3, NO. 10 (October 1982 issue, Industrial Research Association) pages 49-56, "Plastic sheet molding technology for improved appearance": as described in Japanese Patent Publication No. 61-46305. The so-called "extruder", "die", "polished roll unit (polishing roll machine)", "roller table", "edge trimming device", "take-up roll", "cutting and stacking device" are used. There is an extrusion method. Others 32 in the above "Handbook of Plastic Processing Technology"
As described on pages 3 to 360, "kneading device" for resin,
There is a so-called calendering method using a device having a "calender roll".

The finishing roll unit cools the molten resin sheets and is usually a glossy roll for smoothing the surface thereof. As a special case, a textured roll may be used.

In the above-described molding method and processing method, the sheet-shaped molten resin in the preceding step is first sandwiched in the gap between the first and second rolls of the finishing roll unit, where the thickness of the sheet-shaped resin is set to a predetermined value. It is assumed that And this one
A resin pool called a bank is formed at the entrance of the gap between the second and second rolls.

2 of the finishing roll unit referred to in the present invention
The rolls after the second roll and the gaps between the rolls are expressed in the order of the rolls along the flow of the sheet-shaped resin, and the second and third gaps, or the third and fourth gaps, and the roll gap depending on the number of rolls The gap between rolls is referred to, and any gap other than the gap between the first and second rolls may be used.

A sheet-like material prepared separately is sandwiched between the second and subsequent rolls of the finishing roll unit. By sandwiching the sheet-like material in the gap between the first and second rolls of the finishing roll unit, the amount of banks existing in the gap fluctuates, in addition to the restrictions on the apparatus, and molding is performed. Bank mark on the sheet,
It is not preferable because surface defects such as pockmarks occur.

If a sheet-like material prepared separately is sandwiched from one of the gaps between the second and subsequent rolls of the finishing roll, a laminated plate having a two-layer structure is formed, and the sheet-like matter is sandwiched from two places of the gap. For example, a laminate having a three-layer structure can be created.

In order to enhance the adhesiveness between the sheet resin and the separately prepared sheet-shaped material, the surface of the sheet-shaped resin (the surface not in contact with the roll) in the gap between the roll and the roll that sandwiches the separately prepared sheet-shaped material ) Can be heated to further develop the adhesiveness.

To heat the surface of the sheet-shaped resin,
A non-contact type external heater can be applied, and an infrared heater is generally used.

The sheet-like material prepared separately is called a sheet or a film depending on its thickness. Any material may be used as long as it can be heat-sealed with the sheet-shaped resin. Examples include paper, cellophane, metal foil such as aluminum foil, and various thermoplastic resins. Furthermore,
It is also possible to use a multi-layered sheet-like material having various functions. In other words, on the surface of this sheet,
Examples include scratch resistant coatings, UV curable coatings, and strong adhesive coatings.

When the sheet-like material is preferably applied to the production method of the present invention, it is desirable that the sheet-like material can be sequentially fed out from the rolled material.

If the sheet-like material is rigid and has a so-called rigidity, it may be simply unwound and sequentially sandwiched between the rolls, but the sheet-like material may be thin, soft or wrinkled. For a material that is easily twisted, it is necessary to apply tension in the flow direction and the width direction to maintain a uniform flat surface.
The method of applying both tensions may be a known method.

In order to apply tension in the flow direction, when the sheet-like material is unwound, it is not rotated freely but is slightly braked, and a force to pull the sheet-like material to some extent is applied. Is used. Further, in order to make the tension uniform, one of the simple methods is to set a guide roll movable up and down or left and right according to the tension between the feeding device and the roll gap to buffer the fluctuation of the tension.

To apply tension in the width direction, one of the convenient methods is to use a so-called expander roll having a maximum central diameter and a small end diameter between the feeding device and the roll gap. .

[0022]

According to the method of the present invention, a laminated board can be manufactured with high productivity by using a general thermoplastic resin sheet manufacturing apparatus. Further, by using a multi-functional sheet-like material to be laminated, a multi-functional laminated plate can be obtained.

[0023]

EXAMPLES The present invention will be described below with reference to examples.
The invention is not limited by these examples. The apparatus used in the examples is shown in FIG. The equipment used is as follows.・ Extruder: Screw diameter 150 mm, single shaft, Toshiba Machine Co., Ltd.
Manufacture ・ Flat die: width 1500 mm, lip gap 4 mm ・ Finishing roll: diameter 500 mm, width 1500 mm, 3 rolls, and temperature in order of 90 ° C, 100 ° C, 110 ° C. -Sheet feeding device: Powder brake-Creel stand with tension controller (LD-X tension 1.2Kgf) -Guide roll: Diameter 35 mm, width 1400 mm-Expander roll: Diameter 125 mm, width 1300 mm (you Giken Industry Co., Ltd. FE-S type ・ External heater: infrared heater, 6kw

Example 1 Acrylic resin (SUMIPEX B Sumitomo Chemical Co., Ltd.)
Extruder-Flat Die
The resin sheet having a thickness of 1.3 mm was extruded at 70 ° C. at a flow rate of 600 kg / Hr and about 4 m / min. 6 as a sheet
A urethane-based UV-curable hard coating agent (Koei Hard T-6) on a 5μ polyethylene terephthalate film.
5, a product manufactured by Koei Chemical Co., Ltd. was used, and the coating agent was supplied in a direction in which the coated surface was in contact with the extruded resin sheet.
The obtained laminate had an acrylic resin sheet sufficiently adhered with the hard coating agent.

Example 2 In Example 1, the thickness of the acrylic resin sheet was set to 2.
The same procedure was performed except that the impact-resistant acrylic resin (SUMIPEX HT41X, manufactured by Sumitomo Chemical Co., Ltd.) having a thickness of 0.3 mm was used as the sheet-like material to be laminated. The obtained laminated plate did not peel off even if a cutter knife blade was inserted between the layers to peel it off, and it had good adhesiveness.

[Brief description of drawings]

FIG. 1 is a diagram of an apparatus used in a manufacturing method of the present invention.

[Explanation of symbols]

 1: 1st finishing roll 2: 2nd finishing roll 3: 3rd finishing roll 4: Flat die 5: Resin sheet 6: Sheet material 7: Sheet material feeding device 8: Guide roll 9: Expander roll 10: External heating Container 11: Laminated resin plate

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical indication location // B29L 9:00 (72) Inventor Sadao Satomura 5-1 Sokai-cho, Niihama-shi, Ehime Sumitomo Chemical Industry Co., Ltd.

Claims (1)

[Claims] 1. When a molten thermoplastic resin is used to produce a resin sheet through three or more finishing roll units, a sheet-like material separately prepared in the gap between the second and subsequent rolls of the roll unit. A method for producing a thermoplastic resin laminate, comprising: