JPS60257228A - Manufacturing apparatus for multilayer, biaxialy stretched film of multiform, functional thermoplastic resin - Google Patents

Abstract

PURPOSE:To make possible economical supply of multilayer stretched film provided with special functions, etc. individually required, desired, by arranging a water absorbing processor, a longitudinal unaxial front stretcher and a coating device with a drier between a multilayer film coextrusion film forming machine and a tenter type biaxial synchronous biaxial stretcher. CONSTITUTION:The film-coextrusion film forming machine X composed of three extruders and a multimanifold three layer T die and a cooling roll, the tenter synchronous biaxial stretcher Y, the water-absorbing processor A of a roll guide type hot water disposer installed between two machines X and Y, the hot roll type longitudinal uniaxial front stretcher of variable stretching device B and the coating device C composed of a reverse roll coater and an arch hot air drier are arranged and installed in this apparatus. By changing forming material for the film a carrying path of the film is changed by the film carrying member Z, the working method for the film is selected, various multilayer stretched film are obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a manufacturing apparatus suitable for producing multilayer, biaxially stretched thermoplastic resin films of various types and with multiple functions.

As is well known in the art, the quality requirements for biaxially oriented thermoplastic resin films, whether for packaging or industrial use, have become increasingly diverse over the years, and the market demand for films with various special functions has increased. In recent years, demands have shown a tendency to become stronger. There has been a demand for films with excellent gas barrier properties, mold release properties, moisture proofing properties, writing properties, scratch resistance, etc.

Multilayer stretched films formed of two, three or more layers are suitable for these requirements. In other words, by creating multiple layers, each layer can have individual functions and characteristics, and the synergistic effect of these functions and characteristics can meet many of the application requirements and requirements. It is understandable that it is possible to produce a film that satisfies the following.

Problems to be Solved by the Invention However, the market for films with such special functions that are individually required and desired is small, and the quantity is often not large. When attempting to manufacture such films using modernized biaxially oriented film manufacturing equipment, there is a considerable difference between the production volume during standard operating hours and the actual demand volume, making it difficult to make economical decisions. The most difficult problem was that it did not match the target.

Means for Solving the Problems The present invention is a technical means for solving the above-mentioned problems. A multilayer film coextrusion film forming apparatus, such as a multilayer film coextrusion film forming apparatus, which is equipped with a cooling roll for cooling and solidifying the molten film, and, if necessary, an extruder for adhesive resin that increases the adhesive strength between the laminated film layers; It is characterized by a structure in which a clip attached to an endless link chain grips both edges of the film as it runs, is relatively unaffected by the crystallinity of the polymer, and can be stretched without coming into contact with heating rolls, etc. , the drawing temperature can be arbitrarily selected, and the shearing force acting on the interface can be reduced.
Furthermore, between the Tenku complete set simultaneous biaxial stretching machine that can stretch many different thermoplastic resins under less restrictive conditions, a. The film absorbs about 2 to 10% of moisture before stretching. In order to process materials whose stretchability may be improved by the plasticizing effect of water molecules, we have developed a roll that is easy to apply to a wide range of film types, thicknesses, and speeds, and has a simple configuration. A water absorption treatment device mainly consisting of a guided hot water tank.

b. A longitudinal-axial stretching machine that compensates for the drawbacks of the Tenku simultaneous biaxial stretching machine, which has difficulty responding to different longitudinal stretching ratios depending on the polymer used as the material for film forming, or different longitudinal stretching ratios depending on demands.

C1 A polymeric solvent solution or latex, etc. is applied to one or both sides of the film, and a dryer is attached to the film to the extent that the tackiness is removed. We have installed and installed coating equipment to enable multilayering, including a multilayer film coextrusion film forming equipment, a longitudinal-axial stretching machine, a water absorption treatment equipment, a coating equipment with a dryer, and a complete set of Tenku simultaneous biaxial machines. The stretching machines, etc. are connected by a film conveying member with a bypass, and the three machines, such as the longitudinal-axial stretching machine, water absorption treatment equipment, and coating equipment, installed between the two machines are arranged according to the function of the film to be manufactured. The feature is that it can be selected and used at will depending on the type of thermoplastic resin that is the material for forming the film extruded by the multilayer film coextrusion film forming apparatus and the number of extruded films.

By the way, the multilayer film coextrusion film forming device and the coating device that constitute the production device of the present invention are intended to impart various functions to the film by multilayering, and these two types of multilayer film forming devices are By equipping it, the range of materials that can be used for multilayering is expanded. That is, materials suitable for melt extrusion, materials suitable for coating, or both can optionally be used, expanding the range of functions that can be imparted to the film.

In addition, in a combination of a longitudinal-axial stretching machine and a tenter set simultaneous biaxial stretching machine, the tenter set simultaneous biaxial stretching machine grips both edges of the film with clips attached to an endless link chain and runs. Since it is characterized by a mechanism, it has the disadvantage that it is difficult to change the longitudinal stretching ratio, but in order to solve this difficulty, longitudinal-axial stretching was carried out before the simultaneous biaxial stretching machine. This machine is designed to cover the differences in stretching ratios that differ depending on the polymer used for film forming, as well as the different requirements for film quality, such as delicate control of the longitudinal and lateral balance of the stretching ratio.

Furthermore, the water absorption treatment device is made of polyamide film, for example.
Alternatively, films made from materials such as saponified ethylene-vinyl acetate copolymer films can be treated by adding moisture to the film before stretching, which may improve stretchability due to the plasticizing effect of water molecules. It's useless. In other words, in the case of polyamide film that undergoes water absorption treatment,
It is useful for obtaining a stretched film with a high Young's modulus by stretching a film that has undergone a certain degree of crystallization. It is effective when stretching a film with improved gas barrier properties. and,
When used in combination with a longitudinal-axial stretching machine, the water absorption treatment may be performed before pre-stretching, or the water absorption treatment may be performed after pre-stretching. This can be selected by using a film transport member with a bypass.

Materials for the multilayer biaxially stretched film that can be produced by the production apparatus of the present invention include nylon 6/saponified ethylene vinyl acetate copolymer/polyvinylidene chloride, polypropylene/nylon 6/polyvinylidene chloride, polyethylene Saponified terephthalate/ethylene-vinyl acetate copolymer/polyvinylidene chloride, polyethylene terephthalate/matted polyethylene terephthalate, polyethylene terephthalate/heat-sealable polyester copolymer, polyethylene terephthalate/ethylene-tetrafluoroethylene copolymer, high-density polyethylene/ It is nylon 6 grade.

These multilayer biaxially stretched films may be manufactured using all of the equipment that constitutes the manufacturing equipment of the present invention, but
In the case of multilayer films that do not include polyamide-based and saponified ethylene-vinyl acetate copolymer films, water absorption treatment equipment is often not used, and longitudinal-axial stretching machines are used to increase the longitudinal tensile strength and dimension. In most cases, polyethylene terephthalate-based multilayer films are used for applications that require strong stability, and polyolefin-based multilayer films with a large stretching ratio are used.

In this way, depending on the material used for forming the multilayer film depending on the quality and function required for the multilayer film, the multilayer film coextrusion film forming equipment and the tenter set four-time biaxial stretching machine can be arranged between A water absorption treatment device, a longitudinal-axial stretching machine, and a coating device equipped with a dryer can be selectively used by changing the film transport path using a film transport member with a bypass.

Embodiment Hereinafter, embodiments of the present invention will be explained in detail with reference to an embodiment shown in the drawings.

In the figure, X is a film coextrusion film forming apparatus consisting of two 65 bleaching extruders, one 40 throat extruder, a multi-manifold type 3-layer T die, and a cooling roll, and Y is a machine for longitudinal stretching. It is a tenter-equipped four-hour biaxial stretching machine with a magnification of 3.0 times and a transverse stretching ratio variable in the range of 3.0 to 35 times. A water absorption treatment device A consisting of a hot water treatment tank and a stretching ratio of 1.0 to 2.
．． a hot roll type longitudinal-axial stretching machine B variable in the range of 0;
A coating device C consisting of a reverse roll coater and an arch-type hot air dryer is arranged and installed, and each of these devices coats the multilayer film extruded from the film coextrusion film forming device X in the direction of the arrow (for example - A film conveying section 41 with a bypass so that it can be conveyed as shown in a, b, c)
Connect at Z.

In the figure, the water absorption treatment device A is installed above the vertical-axial stretching machine B, but the equipment for feeding raw materials into the film coextrusion film-forming device X, the vertical-axial stretching machine B, and the coating Apparatus C etc. may be installed on the second floor, and the others may be installed on the first floor to reduce the site area.

Variations in this manufacturing equipment can be made by changing the film forming material, changing the film transport route using the film transport member Z, and selecting the processing method for the film. can get.

For example, a three-layer stretched film of nylon 6/saponified ethylene vinyl acetate copolymer/polyvinylidene chloride was produced using all the equipment except longitudinal-axial stretching machine B.
, a food packaging film with excellent strength, moisture resistance, and gas shaving properties can be obtained, and silicon oxide-containing polyethylene terephthalate/additive-free polyethylene terephthalate can be produced using all equipment except water absorption treatment equipment A, which is a hot water treatment tank. The two-layer film co-extruded with
After performing axial stretching and applying silicone resin to the silicon oxide-containing polyethylene terephthalate film in coating machine C, the tenter-equipped simultaneous biaxial stretching machine Y
The film stretched by 3.0 times and 3.4 times in both length and width becomes a film with a matte surface with excellent mold release properties formed on the surface of the base polyethylene terephthalate film.

This was an excellent release film for matte FRP molding.

Effects of the Invention As is clear from the above explanation, the manufacturing apparatus according to the present invention allows for selecting the material for forming the multilayer film to be administered to the multilayer film coextrusion film forming apparatus in this one-line manufacturing apparatus, Alternatively, by selectively using each device or each device in the configuration of this one-line manufacturing equipment, depending on the use of the film conveyance unit with full bypass, this one-line manufacturing equipment not only has different products, but also , it is now possible to produce a wide variety of multi-layer stretched films with different functions depending on the size of the film, and the present invention has a small market, and the quantity is not so large. The present invention has made it possible to provide an apparatus for manufacturing a thermoplastic resin multilayer biaxially stretched film that can economically supply even a multilayer stretched film.

[Brief explanation of drawings]

The drawing is a flow sheet for explaining the configuration of an apparatus for producing a multi-product, multi-functional thermoplastic resin multilayer biaxially stretched film according to the present invention. X, Multilayer film coextrusion film forming device Y: Tenter set simultaneous biaxial stretching machine Z: Film conveying member with bypass A: Water absorption treatment device B: Longitudinal-frontal stretching machine r゛Coating device

Claims (1)

[Claims] A water absorption treatment device, a vertical-axial pre-stretching machine, and a coating device with a dryer are installed between the multilayer film coextrusion film forming device and the tenter set simultaneous biaxial stretching machine, and each of these devices is installed. The three models, which are connected by a film conveying member with a bypass and installed between the two types, are capable of handling thermoplastic resin extruded from a multilayer film coextrusion film forming apparatus according to the function of the film to be manufactured. A manufacturing device for a multi-product, multi-functional thermoplastic multilayer biaxially stretched film, characterized in that it can be used arbitrarily depending on the type, the number of extruded films, etc.