JPS62218350A - Winding method for synthetic resin film - Google Patents

Abstract

PURPOSE:To easily prevent the air from being involved in a rolled film by providing an elastic roll having recesses and projects on the surface at the lower rear position of a winding roll. CONSTITUTION:A film 5 is drawn in the direction of an arrow A, and is wound up around a winding roll 4 as being pressed down by a press driving roll 1 located before the winding roll 4. An elastic roll 2 is located at the upper rear position of the winding roll 4, and an elastic roll 3 is located at the lower rear position of the winding roll 4, so as to sequentially press the film 5 to be wound. In winding the running film 5, it is first pressed by the press driving roll 1 to expel the air to be involved, and then the involved air is moved toward the ends of the film roll by the elastic roll 2. Finally, the involved air is completely expelled from the ends of the film roll by the elastic roll 3 having recesses and projects on the surface.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a winding method that can prevent air from being entrained in a roll film in which a synthetic resin film, particularly a soft synthetic resin film, is wound around a core. Regarding.

(Prior art) Synthetic resin films, especially soft synthetic resin films used for food packaging, etc., are free from foreign matter and wrinkles due to their use, and are also suitable for roll-shaped films wound to a predetermined diameter. It is required as an appearance characteristic that the inner winding core is visible from the outside.

(Problem to be solved by the invention) In order to wind the film so that the internal winding state can be seen from the outside, the film must be inserted so that air does not get trapped between each layer of the wound film. It is sufficient to wind the material while pressing it against the core using a pressure-driven a-roll. However, even if the film is wound using the above method, it is extremely difficult to prevent air from entering between the wound layers of the film. However, it is not possible to prevent the winding core from bending due to the increase in pressing force, causing wrinkles in the film, and preventing air from entering.

(Means for Solving the Problems) The present invention has discovered a winding method that can solve the above problems without unnecessarily increasing the pressing force, and its gist is to suppress and drive the synthetic resin film. J3 is a method of winding while pressing the winding core with a roll, and there is a pressing drive roll 1 in front of the winding core, an elastic roll 2 at the upper rear on the opposite side of the winding core, and an uneven surface at the rear lower part. This method of winding up a synthetic resin film is characterized in that a rolling elastic roll 3 is disposed, and the film wound around the core is rolled up while being sequentially pressed by each roll.

Hereinafter, the present invention will be explained with reference to the drawings. FIG. 1 is a schematic perspective view showing one embodiment of an apparatus used to carry out the present invention.

The film 5 is taken in the direction of the arrow and is wound around the core 4 while being pressed by a pressing drive roll 1 provided in front of the core 4. An elastic roll 2 is arranged at the upper part of the rear opposite side of the core, and an elastic roll 3 is arranged at the lower part so as to sequentially press the film to be wound up.

It is necessary to provide unevenness on the roll surface of the elastic roll 3, and the degree of the unevenness is about 1 to 3 mm in depth.
It is preferable that the pitch is about 2111 m. 1 m deep
If it is less than 3 mtn, it will not be effective in driving out the trapped air (on the contrary, if it is more than 3 mtn, unevenness will be easily transferred to the film, which may be unfavorable in appearance depending on the film.

The uneven pattern (pattern) on the roll surface can be provided in any shape, but it is preferable to provide it in a spiral shape (thread shape) so that the trapped air can escape more easily.

In addition, various resins can be used for the elastic roll, but the roll surface is made of neoprene-butadiene rubber, ethylene-propylene rubber, urethane rubber, silicone rubber, etc. with a hardness of about 30 to 60 (Shore hardness tester). Measured values) can be suitably used. Furthermore, the above-mentioned elastic roll may also be used for the pressure drive roll 1.

The arrangement of the rolls of the present invention is as shown in Fig. 1, with a suppression drive roll 1 in front of the winding core, an elastic roll 2 at the upper rear on the opposite side of the winding core, and an elastic roll with unevenness at the rear lower part. 3
It is necessary to allocate With this arrangement, when the running film is wound onto the core, it is first pressed by the pressure drive roll and wound while expelling the trapped air, and then the elastic roll 2 removes the trapped air from the end of the film roll. Finally, the elastic roll 3 completely pushes out the air from the end due to the unevenness of the surface.

The pressure level of each roll 1.2.3 above varies depending on the type of film, but in the case of soft film it is 3 to 5 kg/c.
A sufficient effect is produced at about m.

Next, the present invention will be specifically explained using examples.
(Example) A soft film was prepared by adding 35 parts by weight of diinnonyl adipate (DINA) as a binding agent to 100 parts by weight of PVC (P=1050), and the film had a thickness of 17 μm and a width of 300 mm. When winding up a paper tube with an outer diameter of 85IllIll, the roll arrangement was as shown in FIG.

The surface resin of the soft roll 2 is made of silicone rubber with a shore hardness of Hs50, and the surface resin of the elastic roll 3 is made of ethylene-propylene rubber with a hardness of Hs50, and a pitch is formed on the surface at a depth of l mo+. is 21011
The concavities and convexities of No. 1 were carved in a spiral shape as shown in FIG.

Further, when the film was wound with the pressing force of each roll being 3.5 Ka/cm so that the outer diameter was 178 inches, the printed surface on the paper tube was completely visible without entrainment of air. Here, as a comparative example, when winding was carried out using a roll without unevenness on the surface of the elastic roll 3 and the same winding conditions as above, there was air entrainment. The printed surface did not look good.

(Effects of the Invention) As explained above, the present invention has the advantage that it is possible to easily prevent air from being entrapped in a roll film, and it is particularly advantageous for soft films that are difficult to handle. It is highly usable with film.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view showing one embodiment of an apparatus used to carry out the present invention. 1...Press drive roll 2...Elastic roll 3...Elastic roll with uneven surface Figure 1-D

Claims (1)

[Claims] In a method of winding a synthetic resin film while pressing it against a core using a pressure drive roll, a pressure drive roll (1) is placed in front of the core, and an elastic roll (2) is placed at the upper rear of the opposite side of the core.
, and a synthetic resin film winding characterized in that an elastic roll (3) having an uneven surface is disposed at the rear lower part, and the film wound around the core is wound up while being sequentially pressed by each roll. How to take it.