JPH03504621A - Manufacturing method of dry molded fibrous material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Manufacturing method of dry molded fibrous material The present invention relates to a method of making a dry formed fibrous web.

A preferred embodiment of the invention is a cellulosic fibrous web, i.e. a so-called dry-formed paper. A method for producing a dry-molded tissue will be described below, but the method of the present invention is applicable to other methods. Needless to say, it can also be applied to the production of various types of fibrous webs.

If you want to produce webs with different structures and properties, the materials can be There are some problems with switching between qualities once they are processed in a single file. Default gray A certain amount of adjustment time is required to maintain the Therefore, it has no choice but to be excluded as a rejected product. The product is manufactured. Increase profitability and reduce costs required to produce a unit quantity of acceptable products In order to achieve this goal, each grade must be operated for a long time. This is equipment This means extra costs and efficiency losses in expensive mass production plants. . As a typical example, the delivered product may have as many as 10 different colors. Consider the case of paper napkins, which require the production of cleaning The grade changeover time spent in This not only increases costs and labor, but also increases cost and effort. A careful production plan must be drawn up by means such as creating a new process. but, This production system provides flexibility to meet market demands for individual grades. Poor.

One of the objects of the present invention is to solve the disadvantages associated with the above-mentioned known manufacturing methods in connection with dry molding materials. The objective is to develop a manufacturing method that eliminates the problem of

The present invention is characterized by dividing the manufacturing process into at least two steps separated from each other. To solve the above problems economically and rationally. In step 1, handling in agglomerated state Materials free of colorants and chemical additives other than the standard ingredients necessary to obtain a smooth web. form material. The next step, step 2, is to process this material to the desired finish. Process to grade. In this way, maximum flexibility and reduced production costs are achieved. is achieved. In step 1, you only need to work with the white material, which must be dried. The relatively small amount of binder solution increases equipment processing speeds and increases uptime. The master reel is made of only white material, making it easy to store. A number of advantages are achieved, including less total waste. In step 2, You are free to choose. Additives can be easily applied and an embossed pattern is used. This means that there will be a wider variety of variations, and the operating time can be adjusted to suit each quality required. Setting it short has the advantage of increasing economic efficiency. used for step 2 It is not necessary to install the equipment directly connected to the high-productivity paper manufacturing equipment; It can be installed at the factory or at the factory of an outside processor. In other words, step 2 and In some cases, subsequent steps can be performed with simpler and cheaper equipment than step 1. This increases the utilization of expensive, high-productivity papermaking equipment. .

The present invention will be explained in more detail according to preferred embodiments.

In step 1, the fibers are formed into a web, which is compressed and a binder is applied; A degree of processing equivalent to 20 to 90%, preferably 60 to 80% of the finished grade. It is then dried on a so-called master reel. This mass is rolled up from semi-processed material. Tarir can be formed with high capacity utilization. Because each web The basic variety of material composition and processing is small, giving uniform properties and high quality. This is because it can be done. The master reel is prepared for processing in subsequent steps. Buffer stock can be measured.

The type and quality of the binder is determined in step 2 by determining the special properties of each side of the web. In step 1, select each side of the web separately so that do it.

In step 2, color, absorbency, flame resistance, embossing, etc. (wet strength) final delivery, including specified properties other than basic “strength characteristics” (such as hair-free properties, etc.) The web is processed to a fine grade.

In step 2, additional binder is applied, which has the desired properties. Other ingredients are mixed in to give the In particular, regarding coloring, the tool of the present invention Step manufacturing enables results that are difficult to achieve with traditional manufacturing methods. used Is the pigment in the binder distributed evenly over the entire surface and covers the fibers to a sufficient depth? A satisfactory color impression can be obtained, and if necessary, the same effect can be obtained on both sides. Can be done. The binder in step 2 is, for example, a liquid (solution, dispersion, suspension), It can be applied in various forms such as paste or foam. Various printing methods such as flexo printing, screen printing, roller coating or spray printing, etc. method can be used.

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Claims (1)

[Claims] 1. Manufacturing takes place in at least two steps, with one step as the first step. The processing grade is equivalent to 20 to 90% of the processing grade achieved by tap processing. Handling of the agglomerated state by adding reduced binder and compacting as by forming a flexible material web and adding the remaining amount of binder as a subsequent step. The final processing of the material web includes coloring pigments, wet strength, flame resistance, surface friction, etc. up to the final grade by adding additives to obtain other properties like A manufacturing method for dry molded materials characterized by finishing. 2 In the first step, the fibers are formed into a web, which is compressed and reduced in weight. The process is characterized by adding a binder and obtaining a degree of processing equivalent to 60-80% of the final grade. The method according to claim 1, wherein the method is characterized by: 3. Claim 1 or 2, characterized in that the manufacturing is carried out in two steps. The method described in section. 4. The surplus can be reused as a binder supplied in the first step. Use a recycled type of binder and use raw as the binder supplied in the second step. of the binder used in the first step while providing complementary bonding strength to the material web. Claim no. The method according to any one of Items 1 to 3. 5. Mixing ingredients that provide other properties into the binder added in the second step Claim 1, characterized in that: The method according to any one of paragraphs 1 to 4.