JPH1067037A - Hot-melt resin sheet, and method and apparatus for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve production efficiency at a time when a molded article is molded by cooling and solidifying the molten matter of a hot-melt resin having stickiness at the normal temp. and to make a releasable packing material easy to peel. SOLUTION: In an apparatus for producing a sticky hot-melt resin sheet by continuously extruding molten matter of a hot-melt type water insoluble resin having stickiness at the normal temp. or resin compsn. A1 in a strip like form at a constant flow rate and adjusting the extrudate to a desired thickness to cool and solidify the same, piping 1 equipped with a quantitative pump sending in the molten matter of the resin or resin compsn. A1 while adjusting the same to a constant rate, the slit like nozzle 2 provided to the leading end of the piping to extrude the molten matter in a strip like state and a support belt conveyor 4a and a V-shaped belt conveyor 4b continuously sending the extruded strip like matter into a water tank 3 while adjusting the thickness thereof and continuously advancing the strip like resin cooled and solidified in water through the water tank to send out the same to the outside of the water tank are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-melt resin sheet, a sheet manufacturing method and a sheet manufacturing apparatus. More specifically, it is an adhesive hot melt resin sheet used for an adhesive or a pressure-sensitive adhesive; a production method in which a melt is extruded into a sheet shape, the thickness is adjusted and cooled and solidified; and a production apparatus is cooled and solidified using a water tank. .

[0002]

2. Description of the Related Art Hot-melt type resins and resin compositions are thermoplastics. Generally, non-adhesive ones are hard at room temperature, while adhesive ones are flexible and sticky at room temperature. For this reason, special attention may be required in handling during production, storage, transportation, use, and the like, and labor may be required. Conventionally, adhesive and hot-melt type resins and resin compositions are in a molten state in the manufacturing equipment. 1) Putting a release sheet in a lining shape in a so-called lunch box type container, A method in which a melt of a resin or a resin composition is poured, cooled and solidified in the air, taken out together with a release sheet, and packaged. 2) When the resin or the resin composition is water-insoluble, the same method is used. A method in which the melt is extruded into a rod shape from a nozzle, wrapped in a release film, cooled in water, cooled, and then wrapped in a stick or pillow shape while being wrapped in the film to form a package wrapped in release paper, etc. It was manufactured by.

[0003]

However, the material obtained by the method 1) is cooled and solidified from a molten state.
Since the package is already packaged with release paper, there is a problem in that the adhesiveness of the resin is a factor and it is difficult to peel off the resin when it is used. In general, this type of resin takes a long time to cool the melt, and therefore, in the method 1), it takes a long time to cool and solidify even in the air. The lower the thermal conductivity of the resin in the process, the longer this time is, and there is a problem in handling space. On the other hand, the method according to the method 2) has a problem that the film to be packaged is carbonized in the re-melting tank when re-melting in the tank at the time of use as an adhesive or a pressure-sensitive adhesive.

[0004]

Means for Solving the Problems As a result of intensive studies to solve these problems, the present inventors have extruded a sticky hot melt type resin or a molten resin composition into a sheet. Those obtained by adjusting the thickness and cooling and solidifying are: a. Good cooling efficiency; b. It is sufficient to pack after solidification, so that the release packaging material is easily peeled off, c. The present invention has been found to be able to form a stacked form or a bellows-like package, which can greatly improve the conventional method, such as easy handling at the time of use, and a manufacturing apparatus using a water tank. Reached.

That is, the present invention relates to the following hot melt resin sheet, a method for producing the same, and a production apparatus. <1> Hot-melt resin sheet A hot-melt type resin or a melt of the resin composition (A), which is tacky at room temperature, is extruded in a belt shape, adjusted to a desired thickness, cooled and solidified. Adhesive hot melt resin sheet.

<2> Hot Melt Resin Sheet Production Method A hot melt type resin or a melt of the resin composition (A), which is tacky at room temperature, is continuously extruded into a strip at a constant flow rate to obtain a desired material. A method for producing an adhesive hot melt resin sheet which is cooled and solidified while being adjusted in thickness and moved in a band in a refrigerant or in the atmosphere.

<3> Hot Melt Resin Sheet Manufacturing Apparatus The melt of the water-insoluble resin or resin composition (A1) of the tacky and hot melt type is continuously extruded into a strip at a constant flow rate to obtain a desired thickness. An adhesive hot-melt resin sheet manufacturing apparatus that cools and solidifies by adjusting the flow rate, and a pipe (1) equipped with a metering pump for feeding the melt of (A1) at a constant flow rate; A slit-shaped nozzle (2) for extruding the melt at the tip of the strip into a strip, and continuously feeding the water into the lower water tank (3) while adjusting the thickness of the strip, and cooling in water Means for continuously advancing the solidified band-shaped resin in a water tank and sending it out of the water tank.

[0008]

The resin sheet of the present invention is extruded into a sheet and cooled by using a melt of the resin or the resin composition (A), so that the resin sheet has a large surface area and is adjusted to a desired thickness. Since a thin product is obtained and is continuously cooled in a belt shape, the cooling efficiency during manufacturing is good. The resin sheet of the present invention is a thin sheet-like molded product, and can be in the form of a stacked or bellows-like package, and is easy to handle at the time of use. Although the resin sheet of the present invention is tacky at room temperature, it is formed into a sheet before being packaged, and when it is packaged with a release packaging material, it has been solidified. The material can be easily peeled off.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the adhesive or hot-melt type resin or resin composition (A) includes:
For example, hot-melt resins or resin compositions such as ethylene-vinyl acetate (EVA), amorphous poly-α-olefin (APAO), styrene block copolymer rubber, styrene, olefin, polyester, and polyamide can be used. These may be those that can be used as such as adhesives, pressure-sensitive adhesives, etc., or may be intermediates or components of these final products. (A) may be water-soluble or water-insoluble, but if it is water-soluble, <1> and <2
The cooling and solidification in <> need to be performed in the air or in a non-aqueous refrigerant. If it is insoluble in water, it can be cooled and solidified in the air or water. For example, it can be cooled and solidified in a water tank with the device <3>.

The resin or the resin composition (A) is tacky at room temperature, and various known additives (for example, tackifiers (rosin-based resin, terpene-based resin)) as long as they do not impair the properties of the hot melt type. Resin, cumarone-indene resin, petroleum resin, etc.), wax (paraffin wax, microcrystalline wax, low molecular weight polyolefin wax, etc.), plasticizer (process oil, low molecular weight liquid resin, etc.), stabilizer (antioxidant, UV inhibitors),
A filler or the like may be added.

The softening point of the resin or the resin composition (A) is as follows:
It is usually 50 to 180 ° C, and the thermal conductivity is usually 0.1 to
0.5 kcal / m · h · ° C. The value of the adhesive test (A) according to the adhesion test (180 ° peeling method specified in JIS Z 0237) is usually 0.1 to 10 kg / 25 m
m.

The pressure-sensitive adhesive hot-melt resin sheet of the present invention <1> is obtained by the method of the present invention <2>, and the melt of the resin or the resin composition (A) is extruded in a belt shape, It is adjusted to a desired thickness, cooled and solidified, and its manufacturing method will be exemplified below. The melt of (A) is discharged through a pipe at a constant flow rate from a tank containing the melt of (A) [for example, when (A) is a pressure-sensitive adhesive composition or the like, a production tank thereof), and the melt is slit. And extrude it into a belt through a base. The strip is adjusted to a desired thickness by a rolling roller in the atmosphere, and cooled and solidified. As described above, it is necessary to select a method for cooling and solidifying depending on whether the air (A) is water-soluble or water-insoluble in the air, water, non-aqueous refrigerant, or the like.

When the resin or the resin composition (A) is water-insoluble (A1), the cooling and solidifying in water is more efficient in cooling than in air. In this case, the cooling and the solidification are performed while moving in a belt shape in the water. If it is solidified in the water, it is sufficient if there is a means for transporting the strip-shaped object while supporting it in the water and taking it out of the water. Specifically, it will be described separately using the device <3> of the present invention.

[0014] When water or a non-aqueous refrigerant is used, the band-shaped adhesive hot melt resin sheet cooled and solidified by the method exemplified above is dried by blowing air onto the surface, and then dried. It can be packaged with a release packaging material. PET film, PP
Films, papers, etc. that have been treated with a release agent can be mentioned, and in the packaging material, a band-shaped object is cut into a fixed length to be in a laminated state, or a band-shaped or folded in a bellows shape and a constant It can be cut in length and packaged in a state.
Such a package is suitable, for example, as a package for an adhesive or a pressure-sensitive adhesive.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the manufacturing apparatus according to the present invention <3> will be described below with reference to the drawings. FIG. 1 is a schematic cross-sectional view of the resin sheet manufacturing apparatus of the present invention. In FIG. 1, A1 is tacky at room temperature, is a hot melt type, a water-insoluble resin or resin composition, 1 is a pipe, 2 is a slit-shaped nozzle,
3 is a water tank, 4a is a supporting belt conveyor, 4b is a V-shaped belt conveyor, 5a is a guide roll of a belt conveyor, 5b is a guide roll of a resin sheet, 6 is a tank for manufacturing (A1), 7 Is a strainer, 8 is a metering pump, 9 is a rolling roll, 10 is an air blow device, 1
1 is a cutting device, 12 is a roll-shaped release paper, 13 is a weighing conveyor, 14 is a belt conveyor, 15 is an open / close dropping type packaging device, and 16 is water.

The production apparatus of the present invention <3> adjusts the melt of the water-insoluble resin or the resin composition (A1) to a desired thickness, and cools and solidifies to produce an adhesive hot melt resin sheet. As shown in FIG. 1, a pipe (1) for feeding the melt of (A1) at a constant flow rate, and a pipe (1) shown in FIG.
And a slit-shaped nozzle (2) for extruding the molten material at the end of the pipe in a strip shape. In FIG. 1, the (A1) melt in the tank (6) flows through the pipe (1) through the metering pump (8) and the strainer (7) while the flow rate is adjusted to be constant, and the slit nozzle (2) ) Is extruded in a belt shape.

In the manufacturing apparatus according to the present invention <3>, the means described in the above item, that is, while adjusting the thickness of the strip extruded from the nozzle (2), continuously into the water tank (3) below it. The belt-like resin that has been sent in and cooled and solidified in water,
It has a means to continuously advance in the water tank and send it out of the water tank. In FIG. 1, the support belt
Conveyor (4a) and V-shaped belt conveyor (4b)
Is provided. Here, the conveyor (4a) is a releasable material conveyor having an inclined surface toward the inside of the water tank in order to support the belt-like molten material from the nozzle (2) into the water.

Here, in FIG. 1, (A1) is an apparatus having a specific gravity smaller than 1 and floating on water. (A
When the specific gravity of 1) is larger than 1, instead of the V-shaped belt conveyor (4b), the belt-shaped resin may be guided out of the water tank by a rotating belt that transports the resin in the water.
On the other hand, the conveyor (4b) has an inclined surface facing downwardly facing the inclined surface of the conveyor (4a), and a water tank formed by advancing the inside of the water tank while supporting the floating of the band which solidifies and cools in water. This is a conveyor made of a releasable material that has a surface that is refracted and inverted at the lower part of the water tank and inclined upward to be sent out. A roll supporting the conveyor (4b) is provided at a position opposed to an upper roll supporting the conveyor (4a) [a rolling roll (9) is provided in FIG. 1),
It has a clearance adjusting function by adjusting the interval between two rolls. With this function, the thickness of the strip is adjusted before cooling in water proceeds.

As shown in FIG. 1, the belt-like resin fed onto the conveyor (4b) is adjusted to a desired thickness by adjusting the clearance between the rolling roller (9) and the opposing roller. , Transported and solidified in water.
The conveyor (4b) functions to support the lifting of (A1) in water and to assist the resin in advancing while solidifying in a belt-like form by the rotation of the contacting belt.

In FIG. 1, the conveyor (4b) has a loop-like shape supported by a guide roll (5a) which rotates in contact with a plurality of inflection points above and below the water of the conveyor.
It is a conveyor that rotates around. In FIG. 1,
A guide roll (5b) which supports the belt-shaped resin sent out of the water tank and rotates in contact therewith is provided. Examples of the material of the belt conveyors (4a) and (4b) include a releasable resin such as a silicon-based or urethane-based resin. As the material of the guide roll (5b), a metal roll such as a SUS is used for a silicon plasma. Abrasion-resistant and releasable materials such as those coated and coated with a silicone resin may be used.

For this purpose, the conveyors (4a) and (4b) are provided in FIG.
A combination of conveyors such as That is, FIG. 2 is a cross-sectional view showing a portion where a drum-shaped belt conveyor and a belt conveyor having a semicircular surface are provided in a water tank. In FIG. 2, A1 is adhesive at room temperature, is a hot melt type, a water-insoluble resin or resin composition, 3 is a water tank, 4c is a drum-shaped belt conveyor, and 4d is a belt conveyor having a semicircular peripheral surface. 5a is a guide roll of the belt conveyor, 9 is a rolling roll, and 16 is water.

As shown in FIG. 2, the conveyor (4c) is partially above the water surface. On the other hand, the conveyor (4d)
The conveyer (4c) has an inward semicircular surface facing both sides and a lower surface thereof, facing both sides and a lower surface, and both ends of which are above the water surface. One end (left side in FIG. 2) of the gap between the conveyors (4c) and (4d) is arranged so that the band-like melt from the nozzle (2) enters. The conveyors (4c) and (4
In the gap with d), the cooling and solidification of the strip (A1) progresses in water through this gap, and the strip advances while moving in the water tank while supporting the float, and is sent out of the water tank from the other end of the gap. It is designed to be. An upper roll (in FIG. 2, a rolling roll (9)) supporting the conveyor (4c) in the vicinity of a position where a belt-shaped melt enters, and the conveyor (4d).
It has a clearance adjustment function by adjusting the distance between the drum and the supporting drum. As shown in FIG. 2, the belt-like resin fed into the gap between the conveyors (4c) and (4d) is adjusted to a desired thickness by adjusting the clearance between the rolling roller (9) and the drum. Transported and solidified in water.

The state after solidification in water will be described with reference to FIG. The solidified (A1) that has come out of the water tank (3) and has a belt shape is supported by guide rolls (5b), moves forward, is dried by an air blow device (10), and is then loaded with release paper. It is dropped on the weighing conveyor (13) and weighed. Release paper on the weighing conveyor is supplied from roll release paper (12). It is cut by a cutting device (11) linked to a weighing machine at a desired constant weight, and is moved and packed by the next belt conveyor (14) and the opening / closing fall type packaging device (15). The package can be shipped in a cardboard box or the like.

[0024]

The method and the apparatus for producing the adhesive hot melt adhesive sheet of the present invention have the following effects as compared with the conventional one. (1) Since the hot melt resin is continuously extruded in a sheet form, adjusted to a desired thickness, and cooled in the refrigerant liquid, the cooling efficiency is high. (2) Since the adhesive hot melt is adjusted to a desired thickness in advance, cooled and solidified, and then packaged in a release sheet, it is easy to peel off at the time of use and easy to handle. Because of the above effects, the production method and the production apparatus of the present invention are particularly useful for taking out the adhesive hot melt adhesive,
It can also be used for taking out other thermoplastic resins and the like.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of an apparatus for producing an adhesive hot melt resin sheet according to the present invention.

FIG. 2 is a schematic cross-sectional view illustrating a conveyor in a water tank (3) in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Piping 2 Slit nozzle 3 Water tank 4a Belt conveyor for support 4b V-shaped (drum-shaped) belt conveyor 5a Guide roll inside water tank 5b Guide roll outside water tank 6 (A1) Production tank 7 Strainer 8 Fixed amount Pump 9 Rolling roller 10 Air blow device 11 Cutting device 12 Roll release paper 13 Measuring conveyor 14 Belt conveyor 15 Opening / closing fall type packaging device 16 Water

Claims (9)

[Claims] 1. A hot-melt type adhesive which is sticky at room temperature, and is formed by extruding a molten resin or a resin composition (A) into a strip, adjusting the thickness to a desired thickness, and cooling and solidifying the resin. Hot melt resin sheet. 2. The thermal conductivity of (A) is 0.1 to 0.5 kc.
al / m · h · ° C. and a tackiness test (JIS Z 02
The value according to the 180 ° peeling method specified in 37)
The resin sheet according to claim 1, which has a weight of 0.1 to 10 kg / 25 mm. 3. The resin sheet according to claim 1, wherein (A) is a water-insoluble resin or a resin composition (A1), and the cooling / solidification is performed while moving in water in a strip shape. 4. The resin sheet according to claim 1, wherein after cooling and solidifying, the resin sheet is packaged in a release packaging material in a laminated state or folded in a bellows shape. 5. The method according to claim 1, which is for an adhesive or a pressure-sensitive adhesive.
5. The resin sheet according to any one of 4. 6. A hot-melt type resin which is tacky at room temperature and is continuously extruded into a strip at a constant flow rate at a constant flow rate and adjusted to a desired thickness to obtain a refrigerant. A method for producing an adhesive hot melt resin sheet that is cooled and solidified while being moved in a band in the air or in the air. 7. A sticky hot-melt type water-insoluble resin or a melt of the resin composition (A1) is continuously extruded at a constant flow rate into a belt shape, adjusted to a desired thickness, and cooled / solidified. A pipe (1) equipped with a metering pump for feeding the melt of (A1) while adjusting the flow rate to a constant value, and a belt-shaped melt at the tip of the pipe. A slit-shaped nozzle (2) for extruding the resin, and a belt-like resin cooled and solidified in water while being continuously fed into a lower water tank (3) while adjusting the thickness of the extruded band-like material. An adhesive hot-melt resin sheet manufacturing apparatus comprising means for continuously advancing in a water tank and sending it out of the water tank. 8. The resin sheet manufacturing apparatus according to claim 1, wherein the specific gravity of (A1) is 1 or less, a supporting belt conveyor (4a) for the means described, and a V-shaped belt. A conveyor (4b) is provided, and the conveyor (4b)
a) is a conveyor made of a releasable material having a slope toward the inside of the water tank to support the belt-like molten material from the nozzle (2) into the water, and the conveyor (4b) is a conveyor (4b). 4a) The inclined surface facing downward and facing the inclined surface of FIG. 4A is refracted and inverted at the lower part of the water tank for advancing the inside of the water tank and sending it out of the water tank while supporting the floating of the band solidifying and cooling in water. And a roll supporting the conveyor (4b) at a position opposed to an upper roll supporting the conveyor (4a), and a gap between the two rolls. 9. The manufacturing apparatus according to claim 8, which has a clearance adjusting function by preparation. 9. The resin sheet manufacturing apparatus according to claim 1, wherein the specific gravity of (A1) is 1 or less, and a drum-shaped belt conveyor (4c) for the means described in claim 1; A belt conveyor (4d) having a surface is provided,
The conveyor (4c) has an upper part protruding above the water surface, and the conveyor (4d) has surfaces surrounding the conveyor (4c) opposite to both sides and a lower part thereof. One end of the gap is arranged so that the band-like melt from the nozzle (2) enters, and through the gap between (4c) and (4d), the cooling and solidification of (A1) progresses in water and The (4d) supports the conveyor (4c) near the position where the belt-like melt enters so that the both ends have an inward semicircular surface protruding above the water surface so as to be sent out of the water tank from the other end. The manufacturing apparatus according to claim 7, further comprising a clearance adjusting function by adjusting a distance between an upper roll and a drum supporting the conveyor (4d).