CN101670642B - Method for producing TPU film by casting and counter-pressing - Google Patents

Abstract

The invention discloses a method for producing a TPU film by casting and butt-pressing, which comprises the steps of extruding accumulated materials through a die head arranged at the upper side of a main mirror wheel and a middle and high mirror wheel, enabling the accumulated materials to flow between the main mirror wheel and the middle and high mirror wheel, setting the constant temperature of 20-100 ℃ for the main mirror wheel and the middle and high mirror wheel through a die temperature machine, rotating the main mirror wheel and the middle and high mirror wheel in opposite directions simultaneously, carrying out butt-pressing on the accumulated materials, carrying out cooling circulation on a film by the middle and high mirror wheel to obtain a formed product; the invention sets constant temperature for the main mirror surface wheel and the middle and high mirror surface wheels through the mold temperature machine, then the main mirror surface wheel and the middle and high mirror surface wheels press the accumulated materials, then the cooling forming wheel carries out cooling circulation on the film to obtain a formed product, the cooling forming is rapid, and the pressing of the mirror surface wheels can lead the thickness of the TPU film to be uniform without crystal points, flow marks and the like.

Description

A kind of method for casting and pressing to produce TPU film

technical field

The invention relates to a method for processing a TPU (thermoplastic polyurethane) film.

Background technique

TPU is an environmentally friendly high molecular polymer. It is called thermoplastic polyurethane in Chinese. It overcomes many defects of PVC and PU leather. It not only has most of the characteristics of rubber and ordinary plastics, but also has excellent comprehensive physical and chemical properties. Therefore, Also known as future material. TPU film is a film made of TPU pellets through a special process. It inherits the excellent physical properties of TPU and has a wide range of applications.

Casting counter-pressure is a device that flows the TPU melt from the die head to the two mirror wheels, extrudes and shapes it, and cools to form a transparent and colored TPU film.

Contents of the invention

The purpose of the present invention is to provide a casting and pressing production method that can ensure uniform film thickness and no crystal point flow marks.

The technical solution adopted by the present invention to solve its technical problems is: a method for producing TPU film by casting against pressure, placing the accumulated material between the main mirror wheel and the middle-high mirror wheel, and the middle-high mirror wheel refers to the middle radius There will be an extra 2mm-20mm mirror wheel. The main mirror wheel has no middle height, the circumference is the same, and the diameter is the same size. Set the constant temperature for the main mirror wheel and the middle-height mirror wheel through the mold temperature machine. The main mirror wheel and the middle-height mirror The wheels rotate in the opposite direction at the same time to press against the accumulated material, and the film after the counter-press is brought to the cooling forming wheel by the middle-high mirror wheel, and the cooling forming wheel performs a cooling cycle on the film to obtain a formed product.

The mold temperature machine sets a constant temperature for the main mirror wheel and the middle and high mirror wheels, and the constant temperature can be set between 20°C and 100°C.

The accumulated material is extruded through the die head arranged on the upper side of the main mirror wheel and the middle-high mirror wheel.

The beneficial effects of the present invention are as follows: set the constant temperature for the main mirror wheel and the middle-high mirror wheel through the mold temperature machine, then press the main mirror wheel and the middle-high mirror wheel against the accumulated material, and then cool the forming wheel to cool the film to obtain a molded product, forming and cooling Quickly, the pressing of the mirror wheel can make the thickness of the TPU film uniform, without crystal points and flow marks, and produce high-quality TPU film to meet the requirements of high-end products.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is the structural representation of realizing the tape-casting pressure device of the present invention;

Fig. 2 is the schematic diagram of high mirror wheel in Fig. 1;

FIG. 3 is a schematic diagram of the primary mirror wheel in FIG. 1 .

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

A method for producing TPU film by casting against pressure. The melted TPU material is extruded through the die head arranged on the upper side of the main mirror wheel and the middle-high mirror wheel. The middle-high mirror wheel means that the middle radius will be 2mm- 20mm mirror wheel, the main mirror wheel has no middle height, the circumference is the same, and the diameter is the same size. Set the constant temperature for the main mirror wheel and the middle and high mirror wheel through the mold temperature machine. The constant temperature can be set between 20°C and 100°C During the period, the accumulated material flows between the main mirror wheel and the middle and high mirror wheels, and the constant temperature of 20°C-100°C is set for the main mirror wheel and the middle and high mirror wheels through the mold temperature machine, and the main mirror wheel and the middle and high mirror wheels rotate in opposite directions at the same time. The accumulated material is counter-pressed, and the film after counter-pressing is brought to the cooling forming wheel by the middle-high mirror wheel, and the cooling forming wheel performs a cooling cycle on the film to obtain a formed product. In the present invention, a constant temperature is set for the main mirror wheel and the middle-high mirror wheel through the mold temperature machine, and then the main mirror wheel and the middle-high mirror wheel press against the accumulated material, and then the cooling forming wheel performs a cooling cycle on the film to obtain a molded product, and the cooling molding is rapid, and the mirror wheel The precise lamination can make the thickness of the TPU film uniform, free of crystal points and flow marks, and produce high-quality TPU film to meet the requirements of high-end products.

Referring to Fig. 1, Fig. 2 and Fig. 3, a casting counter-pressure device includes a die head 4 for extruding accumulated material 7, and the lower side of the die head 4 is horizontally arranged with a main mirror wheel 1, a middle-high mirror wheel 2 and Cool the forming wheel 3, the main mirror wheel 1 and the middle and high mirror wheel 2 are respectively arranged on the left and right sides of the outlet of the die head 4, the lower side of the main mirror wheel 1 is provided with a mold temperature machine 6, the main mirror wheel 1 and the middle and high mirror wheel 2 are respectively connected with a mold temperature machine 6 through a water pipe 5, and the mold temperature machine 6 sets different temperatures for the main mirror wheel 1 and the middle and high mirror wheel 2 according to the hardness and thickness of the product. During operation, the accumulated material 7 extruded by the die head 4 falls between the main mirror wheel 1 and the middle-high mirror wheel 2 for counter-pressure, wraps on the middle-high mirror wheel 2 , and is rolled onto the cooling forming wheel 3 .

The above-mentioned embodiments only illustrate the principles and effects of the present invention, as well as the partially used embodiments. For those of ordinary skill in the art, without departing from the inventive concept of the present invention, some deformations and modifications can also be made. Improvements, these all belong to the protection scope of the present invention.

Claims (6)

1. a curtain coating is to pressing the method for producing the TPU film, it is characterized in that: buildup is placed between primary mirror wheel and middle high minute surface wheel, described middle high minute surface wheel refers to that middle radius can have more the minute surface wheel of 2mm-20mm, described primary mirror wheel does not have middle height, girth is identical, diameter is consistent size, by die heater, primary mirror wheel and middle high minute surface wheel are arranged constant temperature, primary mirror wheel and middle high minute surface wheel rotate with opposite direction simultaneously, buildup is carried out pressing, high minute surface wheel in film quilt after pressing is taken on the cooling forming wheel, the cooling forming wheel carries out cool cycles to film and obtains shaped article.

2. a kind of curtain coating according to claim 1 to pressing the method for producing the TPU film, is characterized in that, die heater arranges constant temperature to the primary mirror wheel, and described constant temperature can arrange between 20 ℃-100 ℃.

3. a kind of curtain coating according to claim 1 to pressing the method for producing the TPU film, is characterized in that, the high minute surface wheel of die heater centering arranges constant temperature, and described constant temperature can arrange between 20 ℃-100 ℃.

4. according to claim 1 and 2 or 3 described a kind of curtain coatings to pressing the method for producing the TPU film, is characterized in that, described buildup is extruded by the die head that is arranged on primary mirror wheel and middle high minute surface wheel upside.

5. a kind of curtain coating according to claim 4 to pressing the method for producing the TPU film, is characterized in that, described primary mirror wheel and middle high minute surface wheel level are arranged.

6. a kind of curtain coating according to claim 5 to pressing the method for producing the TPU film, is characterized in that, die heater arranges respectively different temperature according to hardness and the thickness of product to primary mirror wheel and middle high minute surface wheel.

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