KR20230078357A - Multi-Layer Blown Adhesive Film - Google Patents

Abstract

The present invention relates to a device for manufacturing a multi-layer blown adhesive film, which is capable of producing a multilayer blown adhesive film capable of adhering different materials laminated with a top film layer made of hot melt TPU film, an adhesive layer made of functional material for adhering different materials, and a release film layer made of recyclable PET resin by blown film extrusion. The device for manufacturing a multi-layer blown adhesive film capable of adhering different materials according to the present invention comprises: a plurality of extruders for melting a plurality of polymers which are raw materials for a multi-layer blown film containing hot melt resin pellets; a die which is connected to the end of the extruder from which the molten polymer is discharged and releases the polymer at a constant thickness to create a multi-layer blown film; an air-ring which cools the heat of the polymer coming out of the die; a flap board which guides the multi-layer blown film which comes out of the die in a balloon shape; a nip roll which pulls the multi-layer blown film at a constant speed so that the multi-layer blown film has a constant tension; a plurality of guide rolls which guide the direction of the multi-layer blown film produced; and a winding roll for winding the completed multi-layer blown film.

Description

Multi-Layer Blown Adhesive Film capable of bonding different materials {Multi-Layer Blown Adhesive Film}

The present invention relates to a multi-layer blown adhesive film, and more particularly, to a top film layer made of a hot-melt TPU material, and a functional material for point bonding of dissimilar materials. It relates to a multi-layer blown adhesive film capable of bonding different materials, in which an adhesion layer made of PET resin and a release film layer made of recyclable PET resin are manufactured by a blown film extrusion method.

Currently, the process improvement and automation method for shoes and apparel products are being converted, and the production method is also converted to bonding method rather than the existing stitch method. It is essential to secure the process and develop adhesive materials.

While manufacturing non-stitch type shoes and clothing fabrics, in the past, chemical solvent-type adhesives containing organic solvents were used to attach functional films to the fabrics, but problems occurred due to the toxicity of the solvents. are doing

In addition, due to global environmental regulations, development of eco-friendly processes and material technologies that do not use solvents in solvent-type adhesives is progressing in the adhesive and adhesive field. Research and development on bonding methods that secure excellent bonding strength are being conducted.

For example, a film laminating process that combines fabric and adhesive film using a film type adhesive material for bonding of different materials has been developed and used.

However, when producing film type adhesive materials through T-Die equipment, which is a general film material production method, it is difficult to control due to the phenomenon (Neck-in) of raw materials unique to T-Die, and the process time for technical stabilization until film formation is long. It takes a lot of time, and it is difficult to control the thickness.

In particular, in the case of hot melt adhesive film, products are produced using release paper, and the unit price of the release paper material itself is high, and as it is used and discarded once, the price competitiveness of the product itself decreases, and environmental pollution and disposal costs are reduced. There is a problem with occurrence.

In addition, adhesive film and release paper laminated products produced by T-Die Casting have a high loss rate due to a large number of defects during initial setting. The defect rate is significantly reduced during the stabilization stage during mass production, but many defects occur during small-scale production and lot conversion. There are problems with factors.

Republic of Korea Patent No. 10-0693068

The present invention uses a multi-layer blower type balloon extruder to make a hot melt type material into a film, controls the shrinkage and orientation of the film in both directions, and reduces the thickness of the heterogeneous It is to provide a multi-layer blown adhesive film capable of attaching materials.

A multi-layer blown adhesive film capable of bonding different materials according to the present invention for achieving the above object includes a top film layer made of a hot melt TPU film material; an adhesion layer laminated on the lower side of the top film layer 1 and made of a functional material for bonding different materials; And, laminated on the lower side of the adhesive layer, a release film layer made of recyclable PET resin; includes.

The multi-layer blown adhesive film of the present invention is released from the top film layer and the adhesive layer by a multi-layer blown film molding method. It is characterized in that the film layer (Release Film) is laminated and molded at the same time.

The multi-layer blown adhesive film according to the present invention is manufactured by the blown hot-melt film extrusion method using the inflation method, and various companies (customer companies) working conditions and Depending on the requirements, it is possible to produce ultra-thin film (0.01~0.05mm), and considering the adhesive, working conditions, and other conditions, use of various types of polymers and production of multilayer products (EVA, Olefin, Ester, TPU, etc.) ) has the potential advantage.

In addition, the configuration of the device for manufacturing the multilayer blown adhesive film is simple and easy to operate, and the MD (Machine Direction, that is, longitudinal direction) and TD (Transverse Direction, transverse direction, that is, vertical direction of the film) Direction) It has excellent strength due to the balance of molecular orientation, and also has the advantage of not requiring a release paper.

In addition, since cutting of both ends of the film is unnecessary, the loss rate can be reduced due to a small amount of scrap, and there is an advantage of excellent price competitiveness.

1 is an exploded perspective view showing a multi-layer blown adhesive film capable of bonding different materials according to the present invention.
2 is a view showing the configuration of an embodiment of a manufacturing apparatus for manufacturing a multi-layer blown adhesive film according to the present invention by a multi-layer blown method.

Referring to the accompanying drawings, a multi-layer blown adhesive film capable of bonding different materials according to embodiments of the present invention will be described in detail. Since the present invention can have various changes and various forms, specific embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to a specific form disclosed, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. Like reference numerals have been used for like elements throughout the description of each figure.

In addition, unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the present application, they should not be interpreted in an ideal or excessively formal meaning. don't

Referring to FIG. 1, the multi-layer blown adhesive film capable of bonding different materials according to the present invention includes a top film layer 1 made of a hot melt TPU film material, It is a composite film in which an adhesion layer (2) made of a functional material for point-adhesion of different materials and a release film layer (3) made of recyclable PET resin are laminated, and it is manufactured by a blown film extrusion method.

Multi-Layer Blown Adhesive Film is manufactured by the blown hot-melt film extrusion method using the inflation method, depending on the working conditions and requirements of various companies (customers). The advantage of being able to produce ultra-thin film (0.01~0.05mm), using various types of polymers and producing multilayer products (EVA, Olefin, Ester, TPU, etc.) considering the adhesive, working conditions, and other matters there is

In addition, there are advantages in that the manufacturing device is simple, the operation is easy, the strength is relatively excellent due to the balance of molecular orientation in both directions, and the release paper is not required. In addition, since cutting of both ends of the film is unnecessary, the loss rate can be reduced due to a small amount of scrap, and the production speed is fast, so there is an advantage of excellent price competitiveness.

The multi-layer blown adhesive film of the present invention may be manufactured by a manufacturing apparatus using a multi-layer blown film molding method described below.

Figure 2 shows a tubular blown film manufacturing apparatus according to an embodiment of the present invention, a plurality of extruders for melting a plurality of polymers, which are raw materials of a multi-layer blown film including hot melt resin pellets. (10), a die (20) that is connected to the end of a plurality of extruders (10) through which molten polymers are discharged and allows polymers to come out at a constant thickness to make a multi-layer blown film, An air ring 30 that cools the heat of the polymer, a flap board 40 that guides the multilayer blown film F coming out of the die 20 in the form of a balloon, and the multilayer blown film F A nip roll 50 that pulls at a constant speed so that the multilayer blown film F has a constant tension, a plurality of guide rolls 60 that orient the produced multilayer blown film F, and It includes a winding roll 70 that winds the finished multilayer blown film (F).

The multi-layer blown film produced by the manufacturing apparatus of the present invention shrinks in both MD (Machine Direction, that is, longitudinal direction) and TD (Transverse Direction, transverse direction, that is, longitudinal direction). It can control over-orientation and has many advantages over mono-layer film.

For example, the film thickness can be further reduced to a thin film, and at the same time, the surface friction coefficient inside and outside the film can be controlled.

The extruder 10 includes an extrusion screw 11 for extruding the molten raw material into a die 20 . The extrusion screw 11 is a transport device for stably supplying homogeneous application materials and is the most important component that determines the quality of the film. The surface of the extrusion screw 11 is preferably coated with PVD. The PVD coating, which greatly contributes to the performance of the extrusion screw 11, is a thin film, but has an excellent effect in reducing strong surface hardness, friction, and wear.

Also, the roughness of the extrusion screw 11 affects the molding process (supply and resin flow). If the surface roughness of the extrusion screw 11 is poor, the fluidity of the resin is reduced, resulting in residual gas and carbide. Therefore, it is preferable to maintain a surface roughness of Ra -0.2 or less before applying the PVD coating on the extrusion screw 11 to obtain good quality coating performance.

The die 20 should be designed to have a very good dispersion of the molten resin in the die 20 and high discharge, and should be manufactured with high stabilization, processing precision, and thickness precision during low-temperature molding. The die 20 includes a plurality of die passages for a plurality of polymers to be melt-extruded in each of the plurality of extruders 10 .

The air-ring 30 is formed in a dual-lip type so that air is intensively supplied between the air-ring lip and the bubble of the film. The air ring in the form of a single lip has low cooling efficiency, so the frost-line increases and the bubble becomes unstable. Since the air ring 30 in the form of a dual lip supplies more cooling air, the production volume increases, and the faster the cooling, the higher the transparency, and thus the quality of the product can be improved.

In the case of a dual-lip air ring, it is possible to increase the production volume and bubble stability, but it is limited in terms of the blow up ratio (BUR). Therefore, the air ring 30 is designed so that the film F does not vibrate and air flows even at a high rate (pressure/temperature).

It is necessary to optimize the cooling air to form a stabilized bubble through the air ring 30. The molten resin is expanded from the head of the extruder 10 into a tube-shaped bubble through a circular die 20 and an air ring 30, and the tube-shaped bubble is transformed into a film shape to produce a film through an MDO stretching machine. . The more stable the bubble is, the higher the production per hour without affecting the thickness control function, so it is necessary to optimize the conditions for bubble formation.

Cooling air supplied to improve bubble stability is preferably -2 to 0°C.

In addition, it is necessary to adjust the gap of the die 20 for bubble stabilization. If the gap of the die 20 is too wide, bubble destabilization may be caused due to excessive extrusion of the resin. Accordingly, bubble cooling is incomplete, optical properties are deteriorated, and imbalance in physical properties may occur due to excessive orientation in the MD (machine) direction. Conversely, when the gap of the die 20 is too narrow, a melt fracture phenomenon occurs due to excessive pressure, resulting in a decrease in productivity. An appropriate gap of the die 20 according to physical properties is 1.0 to 1.5 mm for LDPE and 2.0 to 2.5 mm for LLDPE.

The nip roll 50 is designed to keep the tension constant while bonding the multi-layered films F, and requires roll pressure control to remove blocking. Blocking in the film refers to the property that the film sticks to each other and does not come off well, and when this phenomenon is severe, it must be removed. The higher pressure in the nip roll 50 located closest to the die 20 is the most dangerous factor that can cause blocking inside the film than in the winding roll 70. Accordingly, the pressure of the nip rolls 50 is maintained and controlled to such an extent that bubble formation is maintained.

Although the detailed description of the present invention described above has been described with reference to preferred embodiments of the present invention, those skilled in the art or those having ordinary knowledge in the art will find the spirit of the present invention described in the claims to be described later. And it will be understood that the present invention can be variously modified and changed without departing from the technical scope.

1: Top Film Layer 2: Adhesion Layer
3: Release Film 10: Extruder
11: extrusion screw 20: die
30: Air-ring 40: flap board
50: nip roll 60: guide roll
70: winding roll

Claims (2)

A top film layer (1) made of a hot melt TPU film material;
An adhesion layer (2) made of a functional material for bonding different materials and laminated on the lower side of the top film layer (1);
A release film layer (3) laminated on the lower side of the adhesive layer (2) and made of recyclable PET resin;
A multi-layer blown adhesive film containing a (Multi-Layer Blown Adhesive Film). The method of claim 1, wherein the top film layer (1), the adhesive layer (2) and the release film layer are formed by a multi-layer blown film molding method. (3) is a multi-layer blown adhesive film laminated and molded at the same time (Multi-Layer Blown Adhesive Film).

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