JPH04131696U - Ultrasonic irradiation container for pulp processing - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain better chemical treatment effects and deinking effects with the same power consumption as conventional processing, and to shorten processing time. [Structure] In order to efficiently apply ultrasonic energy to the pulp or waste paper dispersion 5, a sawtooth-like protrusion 7 or a protrusion 7 having a similar shape is provided on the inner wall of the ultrasonic treatment container 2, and an ultrasonic vibrator 1 is provided. The clearance of the same protrusion 7 is 2 to 3
Several locations with a diameter of 1.5 mm are provided, through which the pulp or waste paper dispersion liquid 5 passes.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to an ultrasonic irradiation container for pulp and waste paper processing.

0002

[Conventional technology]

A conventional ultrasonic irradiation container for pulp and waste paper processing is shown in FIG. In the figure, 1 is Ultrasonic vibrator, 2 is ultrasonic treatment container, 3 is packing, 4 is cover, 5 and 6 are packaging. or used paper dispersion. In this container 2, ultrasonic energy is applied to pulp or waste paper. Energy is not applied efficiently, and chemicals permeate into the pulp as expected for a given amount of power consumption, and waste paper It was not possible to remove the adhered ink.

0003

[Problem that the idea aims to solve]

In the conventional ultrasonic irradiation container 2, as mentioned above, the pulp or waste paper dispersion liquid 5 is not efficiently irradiated. No ultrasonic energy is applied, and the expected chemical penetration into the pulp is achieved at a given power consumption. However, there were problems such as inability to remove ink from waste paper. The present invention has been proposed to solve the above-mentioned conventional problems.

0004

[Means to solve the problem]

For this reason, the present invention has a saw blade that includes a narrow part between the ultrasonic transducer and the inner wall surface of the container. It is formed by forming a shaped wall surface, and this is used as a means to solve the problem.

[0005]

[Effect]

A serrated protrusion including a narrow part is provided on the inner wall of the ultrasound irradiation container between the ultrasound transducer and the ultrasound transducer. , ultrasonic waves are generated inside the container with a gap of about 2 to 3 mm between the tip of the protrusion and the ultrasonic vibrator. When the pulp or waste paper dispersion is passed or circulated under the vibrator and the narrow inner wall In space, the impact force due to cavitation in the liquid induced by ultrasonic waves is It is added to pulp or waste paper before it decays. Moreover, at the tip of the sawtooth protrusion, the pulse A strong shearing force acts on the fibers that make up the paper or waste paper. Therefore, in the container , because ultrasonic energy is efficiently transmitted to pulp or waste paper, The penetration of chemicals and the peeling off of ink adhering to waste paper are promoted.

[0006]

【Example】

The present invention will be explained below with reference to the embodiments shown in the drawings. Figures 1 to 3 are examples of the present invention. shows. First, FIG. 1 shows a sawtooth-like projection 7 or a similar shape on the inner wall of the ultrasonic treatment container 2. A protrusion is provided, and the clearance between the tip of the protrusion 7 and the ultrasonic transducer 1 is 2 to 3 m. In addition to providing several locations of m, a flow is provided for continuous inflow and outflow of the dispersion liquids 5 and 6. 1 shows an ultrasonic treatment vessel 2 provided with an inlet 8 and an outlet 9; Also, the pitch of the sawtooth protrusion 7 is The smaller the gap and clearance, the better the irradiation efficiency. The pitch of the protrusions 7 must be adjusted in order to smoothly flow in and out the used paper dispersion liquids 5 and 6. is 10 to 20 mm, and the clearance between the tip of protrusion 7 and vibrator 1 is 2 to 3 mm. is appropriate.

[0007] Now, in Fig. 1, an ultrasonic transducer 1 (frequency 27 KHz, output When a power of 50 W) was installed and irradiation was performed for an effective time of 2.5 minutes using a circulation method, the following results were obtained. Obtained. First, dispersion of unbleached pulp containing bleach (available chlorine 6% to bone-dry pulp) When the liquid (pulp concentration 2%) was treated, the kappa number of the pulp was 51 before treatment. The number was about 34. The kappa number after treatment with the conventional container shown in Figure 4 is 40, The kappa number after treatment with mechanical stirring was about 42. In addition, the copper The value is the amount of N/10 potassium permanganate solution consumed by pulp equivalent to 1 g of bone dry mass. Adjust the number of ml of solution to the value when 50% of the added potassium permanganate is consumed. unbleached and semi-bleached chemical pulp, semi-chemical pulp with a yield of less than 70. Applies to medical pulp.

[0008] In addition, PPC (Plan Paper Copier Electronic) containing deinking chemicals Photo printing paper) After processing waste paper dispersion (2% waste paper concentration), use flotation to The whiteness of the pulp after separating the release ink was 80.5, compared to the pulp treated in the conventional container shown in Figure 4. The pulp whiteness after treatment was 79.1, and the waste paper dispersion before ultrasonication was flowed. The whiteness of the pulp from which the release ink was separated by a separation process was 79.3. In addition, before The whiteness of paper and pulp is determined by irradiation with light in the blue-violet portion of the spectrum. This value is expressed as the specific reflectance of the sample against the standard magnesium oxide plate. It is closely related to the whiteness of paper and pulp, which is close to white in color, and is closely related to the whiteness of bleached pulp and white paper. It can also be applied to paper made from it.

[0009] FIG. 2 shows a second embodiment of the present invention. This embodiment of FIG. 2 has a serrated inner wall of the container 2. This is an example in which the tip 10 of the surface is not sharp and serrated, but has a slightly rounded shape, but it is different from the actual one in Fig. 1. There is no difference in the examples and effects.

0010 Further, FIG. 3 shows a third embodiment of the present invention. The embodiment shown in FIG. This figure shows a cross section perpendicular to the flow of the liquid spray, and the protrusions or grooves 11 on the saw-toothed inner surface are part of the pulse. Although it is formed in the same direction as the flow of the dispersion liquid, it still has the same effect as the above example. There is no difference.

[0011]

[Effect of the idea]

Since the present invention is constructed as explained in detail above, the ultrasonic irradiation capacity of the present invention is Ultrasonic treatment of pulp or waste paper using a It has the same power consumption, same chemical processing effect, and removal as mechanical processing using Drop Pulper etc. An ink effect can be obtained, and the processing time in this case can be shortened to 1/10.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of an ultrasonic irradiation container according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of an ultrasound irradiation container according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view of an ultrasonic irradiation container according to a third embodiment of the present invention.

FIG. 4 is a longitudinal cross-sectional view of a conventional ultrasonic irradiation container.

[Explanation of symbols]

1 Ultrasonic transducer 2 Ultrasonic treatment container 3 Packing 4 Cover 5 Pulp and waste paper dispersion 6 Pulp and waste paper dispersion 7 Protrusion 8 Inlet 9 Outlet

Claims (1)

[Scope of utility model registration request] 1. An ultrasonic irradiation container for pulp processing, characterized in that a sawtooth-shaped wall surface including a narrow portion between the container and the ultrasonic vibrator is formed on the inner wall surface of the container.