KR20040095557A - Manufacturing method for an adhesive mutilayer film and device thereof - Google Patents

Abstract

PURPOSE: A method for producing a hot-melt type multilayered adhesive film and device used therein are provided to make possible to achieve convenient and perfect adhesion by heating at low temperature, without using chemical adhesives, and improve the productivity and process efficiency owing to its simplified process. CONSTITUTION: The hot-melt type multilayered adhesive film is produced by hot-melting and fixing an adhesive film to a substrate in the form of a film or a sheet, wherein the surface of the adhesive sheet comprises a protective film or a sheet of a resin layer that is formed of a resin having a high melting point, and wherein the other side of the adhesive sheet comprises a film or sheet having a buffering effect, which is formed of a resin having a low melting point. The device used for producing the hot-melt type multilayered adhesive film comprises: an extruder for discharging a melted resin under a high temperature and pressure condition; a cast die for forming a film or sheet with the discharged resin; a pair of pinch rolls for flattening the resulted film; a roll of an adhesive tape(1) that is to be melted and fixed to a substrate and a roll of a substrate sheet(2); a pair of heating rolls(4,5) made of silicon; optionally a cooling roll(3); and optionally a roll(6) for winding the film or sheet.

Description

Manufacturing method for an adhesive mutilayer film and device

The present invention relates to a method for manufacturing a heat-sealable multi-layered film and a device thereof, and more particularly, to a film or sheet resin layer as a substrate and various types of films or sheet layers or buffers. The present invention relates to a method for manufacturing a heat-sealed multilayer film and a device thereof, which are formed of a protective film or sheet having a ground layer and are processed to be thermally fused by heating when they are adhered to an adherend.

Recently, various adhesive films or sheets have been developed, but these adhesive films or sheets require the use of an adhesive. Therefore, there is a problem caused by the volatile flammable substances and carcinogens contained in the pressure-sensitive adhesive, and furthermore, there is a problem such as productivity decrease because the pressure-sensitive adhesive coating process is required.

Therefore, research into a multilayer film capable of thermal fusion by heating to a resin layer having a low melting point without using an adhesive as in the prior art has been actively conducted. This method has been proposed to make a resin film or sheet layer having a low melting point by heating to have a strong adhesive ability and to produce a multilayer film by laminating with various kinds of resin film or sheet layer.

However, when heat is normally applied to the resin layer, there is a problem that deformation or breakage may occur to the adherend due to deformation of the pressure sensitive adhesive sheet at high temperature fusion by use of a resin sheet that is excessively contracted and deformed.

Accordingly, the present inventors have studied in order to solve the above problems, and when manufacturing a heat-sealed pressure-sensitive adhesive sheet of one layer or a heat-sealed film of two layers, problems of shrinkage or deformation due to heating as in the prior art are known. The present invention has been completed by contemplating that the above-described conventional problems can be solved by interposing an intermediate resin layer that buffers such shrinkage or deformation, so that the present invention can be obtained.

Accordingly, the present invention is to solve the problems of the prior art as described above, an object of the present invention is to enable heat fusion easily by heating during the manufacture of a protective adhesive film and heat to prevent shrinkage or deformation due to heating To provide a method and apparatus for manufacturing a fusion-sensitive adhesive sheet, the first object of the present invention is to provide a method for producing a variety of types of protective adhesive film that can be heat-sealed during the coating operation of the pressure-sensitive adhesive.

It is a second object of the present invention to provide a manufacturing method according to the first object described above, which can increase productivity by simplifying unnecessary processes or production processes in the production of a protective film.

A third object of the present invention is to provide an apparatus for manufacturing a protective adhesive film or sheet which can efficiently perform the manufacturing method according to the first and second objects described above.

Thus, an object of the present invention is to provide a heat-sealed multilayer adhesive film that can be strongly bonded by using a resin composition having a simple low melting point without using an adhesive or a chemical agent when adhering the adherend to the base film.

1 is a schematic diagram of a film manufacturing apparatus of a heat-sealed multilayer film according to the present invention.

* Explanation of symbols for main parts in the drawings

1. Adhesive tape roll 2. Base roll

3. Guide roll 4. Pressed silicon roll

5. Pressed heat silicone roll 6. Winding roll

Method for producing a heat-sealed multilayer adhesive film of the present invention for achieving the above object;

The surface is a resin layer of a protective film or sheet. The surface is composed of a resin having a high temperature melting point, and the back side is a film or sheet of various types of films or sheets that play a buffer role. It is characterized in that it is formed by thermal fusion to.

According to another configuration of the present invention, the heat-sealed pressure-sensitive adhesive sheet is heat-sealed to the adherend, so that the high-temperature melting point resin of the surface layer is a polyolefin-based resin or copolymers or terpolymers, polyvinyl alcohol, polyvinyl chloride It can be selected from resins such as polystyrene, polyester, and the low-temperature melting point resin of the back layer thereof is polyethylene or copolymers such as ethylene vinyl acetate, ethylene-1-butene, copolymer of ethylene-propylene-butadiene or foaming Polyolefin-based resin film layer or polystyrene layer.

As described above, the multilayer adhesive film prepared according to the present invention is laminated in two or more layers as in the configuration of the present invention, thereby preventing excessive deformation or shrinkage of the adhesive sheet by heating and easily thermal fusion. . That is, the heat-sealed pressure-sensitive adhesive sheet according to the invention is composed of a resin layer of a protective film or sheet on the surface and a processed heat-sealed pressure-sensitive adhesive sheet made of various kinds of films or sheet layers on the back side thereof as described above. It is possible to easily bond by heating without a layer.

On the other hand, according to still another configuration of the present invention, as the film or sheet for the substrate used as the substrate layer of the present invention, if a thermoplastic resin, a thermosetting resin, or the like can be used, for example, polyvinyl alcohol, poly Polyolefin resins such as vinyl chloride, polyvinyl fluoride, polystyrene, polyester, polyethylene terephthalate, polypropylene, polybutene, polybutadiene and copolymers of ethylene-propylene-butadiene or polyvinyl methyl ketone Can be used.

In addition, resins used as an adhesive layer capable of thermal fusion may be used in various types of resin polymers such as films, sheets, foamed sheets, etc., of which the melting point is slightly lower than that of the substrate, and in the present invention, polyethylene, linear low density polyethylene, low density polyethylene Or a copolymer of ethylene vinyl acetate, ethylene-1-butene, ethylene-propylene-butadiene, or the like, and is preferably composed of a soft layer.

On the other hand, in the molding method of the base film of the present invention, the resin composition may be formed into a thin film on a process sheet as a production device such as an inflation film, a cast film, or a T-die, or a T-die or inflation may be used. Calendaring or extrusion molding. Among them, one or more of the thermoplastic resins and thermosetting resins may be mixed to prepare a multilayer film or may be manufactured with different resin layers without mixing, and inorganic additives may be mixed as necessary.

In the heat-sealed adhesive sheet of the present invention, the thickness of each layer is not limited, but is preferably 30 to 3000 µm, more preferably 40 to 2000 µm, and may be prepared by varying the thickness of each layer.

On the other hand, in the present invention, in order to supplement the melting characteristics of the resin composition that is thermally fused by heating, the low boiling point polymer wax components may be mixed to enhance the melting characteristics. In addition, it may be effective to improve the interfacial adhesion surface of the layer by corona treatment on the hot melt surface.

Compared to the adhesive sheet containing the chemically treated adhesive, the heat-sealed adhesive film or sheet according to the present invention is safer against residual substances and can be used stably against chemical changes, and is useful for surface protection as well as in various processes. It can be usefully used. That is, the heat-sealed adhesive sheet manufactured using the heat-sealed multilayer film according to the present invention enables fusion and strong adhesion by heat, and various protective adhesives by heat-sealing a protective film and a base film having various film layers specially manufactured. Not only is it possible to produce the film, but also greatly improves the manufacturing process of the protective adhesive film and a series of manufacturing process is very simple, it is a multilayer film that can be very useful in the manufacturing process of the protective adhesive film. In more detail, this invention provides the multilayer film which can be heat-sealed to a to-be-adhered body by heating, without using the adhesion imparting resin like rubber type or acryl type.

According to another configuration of the present invention, the apparatus for producing a heat-sealed multilayer pressure-sensitive adhesive film for achieving the above object of the present invention is an extruder for discharging the molten resin at high temperature and high pressure, the film or the discharged resin A die for the production of a sheet, a set of pinch rolls for smoothing the film, an adhesive tape roll (1) and a substrate roll (2) for supplying various kinds of films or sheets prepared for heat fusion with the substrate layer, and heating It is characterized in that it consists of two sets of silicon thermal roller means 4 and 5 which enable heat fusion, a cooling roll 3 as an optional means, and a winding roll 6 for film or sheet winding as an optional means.

According to the configuration of the present invention as described above, the heat-sealed adhesive sheet produced using the heat-sealed multilayer film according to the present invention is fused by heat to enable strong adhesion and various film layers specially prepared on the base of the protective film By heat-sealing, not only the production of various protective adhesive films is possible, but also greatly improving the manufacturing process of the protective adhesive film, and since the series of manufacturing process of such multilayer adhesive films is very simple, it can be very useful for the manufacturing process of the protective adhesive film. In particular, the film or sheet extruded from the die for forming a film can be thermally fused through two sets of silicon thermal rollers heated to a predetermined temperature, and a film or sheet can be produced with improved adhesive strength at the time of adhesion. Heat-sealing the film or sheet simultaneously with the film-forming production machinery It is possible to manufacture various kinds of protective adhesive films or sheets in a straight line after the heat fusion process, as well as the continuous production of the film can improve productivity, thereby improving work efficiency and productivity. have.

On the other hand, the term 'film' used throughout the specification including the claims of the present invention is used to define a meaning including a film or sheet, unless otherwise specified.

In addition, the term 'thin film' is used to define the meaning including both the thickness range of the film or sheet that is commonly distributed in the trading world and the thickness range of the ultra-thin film used in a special packaging film, unless otherwise specified. .

Hereinafter, the present invention will be described in more detail with one embodiment.

In the production method of the present invention, the production of a film or sheet to be used as a substrate is extruded in an extruder to stretch or calender the film in an inflation die or T-die, and the like to the guide plate and at least one set of the stretched film or sheet. After passing through the pinch roll, the previously prepared protective film, adhesive film, foamed processed film or sheet and the like are thermally fused with two sets of silicon thermal roller layers together with a base material, and thermally fused to the above-described film or sheet. Significantly improves the thermal fusion strength and adhesion of the film, and it is possible to manufacture various kinds of protective films directly on the same line through a series of continuous processes according to the specifications and processing conditions of the manufacturing equipment. .

In addition, the manufacturing apparatus for carrying out the manufacturing method of the present invention is an extruder (not shown) for discharging the molten resin of high temperature and high pressure, and a die (not shown) for drawing a film having a predetermined thickness and width to the discharged molten resin; A guide plate and at least one set of pinch rolls (not shown) for making the produced film into a smooth film or sheet, heating means (not shown) for controlling the substrate and the manufactured film to an optimum temperature, and a pressurized silicon thermal roller (5). ), Unwinding roll for protection film (not shown), heat-sealed film or sheet, which can be equipped with base film and various kinds of protective films manufactured for heat fusion, in the same direction as the film production line, that is, in the machine direction It consists of at least one set of winding rolls 6 which make winding of said film or sheet | seat possible.

The present invention as described above can be applied to a thermoplastic resin such as a polyethylene resin, a polyolefin resin, a polyvinyl chloride resin, a polystyrene resin, a polyamide resin, or a mixed resin of a thermoplastic resin and a thermosetting resin, and the like. When extrusion molding these resins into a film, the film formed in the die is subjected to at least one set of pinch rolls via a guide plate or a guide roll, and then heated to an optimum temperature, for example, by a heating means such as a rod heater, Passed through the silicon thermal roller in a controlled state, the film or sheet is processed in the same line as the film processing line by the pinch roll, and optionally directly using a cooling roll in a straight line on the same line after high temperature heat fusion molding. By cooling, a protective film or sheet whose production process is simple is efficiently produced.

The heating temperature of the heating means is dependent on the required physical properties of the molding and the physical properties of the resin used and the like, and may be any range as long as the temperature can be optimally formed, such as second stretching, but is not limited thereto. A temperature range of ˜600 ° C. is preferred.

In addition, the cooling roll is cooled to a predetermined temperature (typically about 25 ° C. or less) by a cooling water flow path formed in the cooling roll, or by a separate blower, and the film cooled by the cooling roll is suitable for use. Accordingly, the both ends of the film are slitted or omitted, and the guide roll is guided to the film or sheet, and then wound and wound into the winding machine to manufacture the finished product of the film.

In the above detailed description, the manufacturing method and apparatus according to the present invention have been mainly described with respect to the upward inflation method and the T-die method, but the present invention is not limited thereto, and the same technical concept may be applied to other film production methods. It will be appreciated that the fusion film can be made and of course also within the scope of the present invention.

As described above, the method and apparatus for manufacturing a heat-sealed multilayer pressure-sensitive adhesive film according to the constitution of the present invention are various types of heat-sealed multilayer pressure-sensitive adhesive films which can be easily adhered by simple heating without using a chemical adhesive as in the prior art. It is a useful invention to provide a method for producing and an apparatus which can easily manufacture the same.

Claims (5)

The surface is a resin layer of a protective film or sheet. The surface is composed of a resin having a high temperature melting point, and the back side is a film or sheet of various types of films or sheets that play a buffer role. Method for producing a heat-sealed multi-layer adhesive film characterized in that it is formed by heat fusion. The method of claim 1, wherein the high-temperature melting point resin of the surface layer is selected from a polyolefin-based resin, a copolymer thereof, a terpolymer, a polyvinyl alcohol, a polyvinyl chloride, a polystyrene, and a polyester, and the low temperature of the back layer. The melting point resin is selected from copolymers such as polyethylene, copolymers of ethylene vinyl acetate, ethylene-1-butene, and ethylene-propylene-butadiene, foamed polyolefin resin film layers and polystyrene layers. Method of manufacturing a multilayer multilayer adhesive film. The method of claim 1, wherein the base layer is made of a copolymer of polyvinyl alcohol, polyvinyl chloride, polyvinyl fluoride, polystyrene, polyester, polyethylene terephthalate, polypropylene, polybutene, polybutadiene and ethylene-propylene-butadiene A method for producing a heat-sealed multilayer pressure-sensitive adhesive film, characterized in that polyolefin resin or polyvinyl methyl ketone is mixed or used alone. The method of claim 1, wherein the base film is a surface protection film having a thickness of 30 to 200 μm. 5. Extruder for discharging molten resin at high temperature and high pressure, die for producing film or sheet, set of pinch rolls for smoothing film, various kinds of films prepared for thermal fusion with base layer Adhesive rolls 1 and base rolls 2 for supplying sheets or sheets, two sets of silicon thermal rollers 4 and 5 for heat fusion by heating, cooling rolls 3 as optional means, and optional means An apparatus for producing a heat-sealed multilayer adhesive film, comprising a film or sheet winding roll (6).