JPS6251612B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for manufacturing dusters, and more specifically, by using a blended polymer in which an appropriate amount of polyethylene is mixed with polypropylene as a material for fiber threads of dusters, it has excellent dust collection and retention properties, and has high bulk. The present invention relates to a method for producing dusters that have a good texture, are highly flexible, and are extremely easy to use. Traditional dusters were made from materials such as feathers and synthetic fibers that are easily charged by friction. In addition, recently, as a more suitable method, one using defibrated and crimped polypropylene yarn has been widely adopted. The material for this type of product is limited to fibrillated yarn made of polypropylene alone. In addition, some fibrillated yarns are generally referred to as being made of polyolefin resin, but in any case, I have not found any that use polyethylene. The reason for this is probably due to the manufacturing process, such as the fact that polyethylene films have difficulties in defibrating and crimping, for example, they tend to generate hairs, are too flexible and tend to form into felts or lumps, or the final product. This seems to be due to a quality defect in the product. On the other hand, when the defibrated yarn made of polypropylene alone, which is disclosed in JP-A-56-27232, is crimped, the bulkiness of the duster ears is reduced even when the highest-grade defibrated yarn obtained with current defibrating technology is used. Even if a certain degree of satisfaction is obtained, there are other unsatisfactory points in terms of flexibility, texture, dust retention, etc., and the crimp temperature must be extremely high to obtain a satisfactory result. There is a drawback. Therefore, after repeated various research and experiments, the present inventor focused on the use of a blend polymer of both polypropylene and polyethylene as a new material that skillfully integrated the advantages of both polypropylene and polyethylene and eliminated their mutual defects. did. That is, the weight ratio of isotactic polypropylene and polyethylene is 95:5 to 70:30,
Particularly suitable ones are 85:15 and 75:25.
It has been found that the use of a blended polymer of the following can produce a duster material that has superior bulk, texture, flexibility, etc., and is much more user-friendly than polypropylene alone. The above-mentioned blend polymer of polypropyrolene and polyethylene has a lower heat distortion temperature than polypropylene alone, so the crimp temperature is also lower, and the electrification performance described below is also lower than the crimp polymer. It was found that it was possible to keep charge attenuation due to heat during processing to a minimum, and that bulkiness could be maintained. On the other hand, with conventional dusters that only use frictional charging, the duster ears are electrically charged with either a positive or negative sign, resulting in a strong external electric field and sometimes causing discomfort due to charging. give to the user. In addition, since the electric charge is easy to move, dust easily falls off, and once the dust falls, it is electrically charged with the same sign as the tip of the duster, so when the duster is brought close, this dust repels and escapes, which is an inconvenience. There is a drawback that a phenomenon occurs and re-collection is impossible. On the other hand, dusters that use electrified tips have a mixture of positive and negative charges, so although the external electric field is small, the user does not feel discomfort due to static charge, and the charge is almost fixed. Because of this, no charge is transferred to the dust, making it difficult for dust to fall off, and even if it does fall off, it has the excellent ability to be quickly re-collected. Furthermore, dusters that use triboelectric charging tend to have electric charges that move easily, are easily affected by indoor temperature and humidity, and cannot be used with the same performance throughout the seasons, but dusters that use electrified tips do not. There are no drawbacks. The object of the present invention is to provide a method of manufacturing a duster having an electrified tip using the above-mentioned excellent materials. Hereinafter, details of the present invention will be explained along with embodiments shown in the drawings. First, samples No. 1 to No. 7 as shown in Table 1 were prepared by mixing blend polymers of polypropylene and polyethylene at various mixing ratios as raw materials. A film was produced using materials having such a mixing ratio, and this film was stretched. This stretching ratio is generally preferably 6.0 to 8.5 times. This stretching operation can be carried out using a device known per se. For example, stretching may be carried out by passing the film between a pair of rolls having different circumferential speeds at a temperature higher than room temperature and lower than the softening temperature of the film. When stretching is carried out under heating, a hot roll, hot plate, or
A heated air bath or other heating medium can be used. There is no particular restriction on the film line speed, but a range of 60 to 140 m/min is advantageous in terms of workability. Next, the film thus obtained is subjected to electret processing. This processing is easily carried out by applying a corona discharge to the stretched film. As a corona discharge mechanism, a combination of a discharge electrode such as a corona wire or an electrode with many needles and a counter electrode is used. This is easily done by applying a voltage, for example a DC voltage of 3 to 15 KV. The distance between the discharge electrode and the film varies depending on the applied voltage, but generally an appropriate distance may be selected from a range of 3 to 10 mm. The discharge treatment may normally be performed once, but in some cases it may be performed multiple times. For example, one surface of the film may be subjected to positive corona discharge, and the other surface may be subjected to negative corona discharge. The surface potential of the film rapidly attenuates after the end of the corona discharge, but reaches a certain saturation potential after a certain period of time, whereby the film becomes electret. Electrification is called electric stone or permanent charging, and once an object is charged, its charging state does not change semi-permanently, and positive and negative charges coexist, so the external electric field is small and the user is not charged. Do not cause any discomfort. Moreover, once it comes into contact with dust, since the charge is fixed, the charge does not transfer to the dust, making it difficult for the dust to fall off, and even if it falls, it can be quickly re-collected. In this way, the stretched film that has been subjected to electret processing is defibrated. The fibrillation of the stretched film can be easily carried out by applying friction or mechanical force in the lateral direction of the film, or by bringing the film into contact with a rotating needle roll, due to the fibrillation of the film itself. Generally, the method using needle rolls is advantageous. The needle pitch in needle roll is
A range of 0.2 to 2 mm is desirable. Instead of subjecting the stretched film to the charging treatment and the defibration treatment in the above-mentioned order, the defibration treatment may be performed first and then the charging treatment may be performed. The electret defibrated yarn thus obtained is crimped. In general, the method for manufacturing crimped yarn is based on the principle of using physical or chemical strain within the fiber to deform its internal structure. Methods of relaxing the fibers in a heating medium, strongly twisting the fibers, interlocking the fibers with or rubbing against a mechanical member, and bringing the fibers into contact with a fluid jet are known. There is. Regardless of which of these crimp methods is adopted, in the case of electret defibrated yarn, if the crimp treatment temperature exceeds 110°C, the dust collection rate of the crimped yarn as a product will drop significantly. The reason for this is not entirely clear, but it is believed that the higher the crimping temperature, the greater the crimping effect, but the excessive deformation and relaxation of the internal structure reduces the electret effect. There is. The fiber bundle 1 obtained in this way, which is made up of a predetermined number of electret defibrated and crimped yarns, has a meandering state in which adjacent fiber bundles are in close contact with each other, as shown in Fig. 1. A strip-shaped duster material 2 with a predetermined width is obtained. This material 2 is bound with thread 3 with a loop portion 2a left on one side edge. On the other hand, the other side edge is released by cutting the loop portion 2a. The material 2 constructed as described above is attached to the duster handle 4 as shown in FIG. As is clear from FIG. 2, the handle 4 is formed into a cylindrical shape with a predetermined length, and a frame body 5, which is formed in a roughly central part and opened in a flap shape toward the tip, is used to apply adhesive or the like. Fixed through. A continuous spiral groove 6 is formed on the circumferential surface of the handle 4 from approximately the center to the tip. The base end of this spiral groove 6 reaches the portion covered by the frame 5. Further, a notch 4a having a narrow width is formed at the tip of the handle 4 along the axial direction. The duster material 2 is attached to the handle 4 having the structure described above in the following manner. That is, first, with the loop portion 2a side of the material 2 bound by the thread 3 facing down, the tip of the material 2 is press-fitted into the notch 4a formed at the tip of the handle 4 and fixed.
Thereafter, the remaining portion of the material is wound spirally along the groove 6, with the loop portion 2a facing down, while fitting into the groove 6. As shown in cross section in FIG.
It is fixed to the handle 4 by. When the material 2 is attached in this way, the fiber bundle 1 constituting the material 2 is cut, and the disjointed tips are
The tip of the duster is formed in a cylindrical shape as a whole in a state substantially orthogonal to the axial direction of the handle 4, and an elegant duster is formed. The dusters having the above-mentioned structure were used in samples No. 1 to No. 1 shown in Table 1, which had the mixing ratios as described above.
Constructed using 7 materials, its bulk, flexibility,
Strength, overall usability as a duster, crimping workability while maintaining electret performance,
The results of tests for dust retention and other properties are shown in Table 1 with symbols such as ○ and ×.

[Table] In other words, in Table 1, PP means polypropylene,
PE is the abbreviation for polyethylene, ◎ indicates extremely good condition, 〇 indicates similarly good condition, △ indicates fairly good condition, × indicates poor condition, and XX indicates very good condition. indicates a bad condition. As can be seen from the test results, the overall usability of each sample as a duster was judged as follows. Sample No. 1 is too stiff and has poor flexibility, and the duster tip has poor adhesion to the object to be cleaned, such as a wall, making it inconvenient for cleaning. When sample No. 2 is used, it has some degree of stiffness, but lacks flexibility and therefore poor adhesion. When sample No. 3 is used, it is strong and bulky, and has a little less flexibility, but it is still within the range that can be used as a duster. When sample No. 4 is used, the waist strength, bulkiness, and flexibility are all good. When using sample No. 5, there is a slight problem with the stiffness, but it has good bulk and flexibility, and is within the range of being usable as a duster tip. When sample No. 6 is used, it has extremely good flexibility, but it is weak and becomes dumpling-like when used, making it impossible to use. When sample No. 7 was used, it was too flexible and solidified into a felt-like shape, making it impossible to use. Overall, from the above test results, No. 3~
It was found that the duster using sample No. 5 was satisfactory as a product. In other words, the mixing ratio of polypropylene and polyethylene is
The available range is from 95:5 to 70:30.
It can be seen that a mixing ratio of 80:20 is preferable. In addition, in the experiments shown in Table 1, the thickness of the stretched film was 20
μ, fiber thickness 0.2mm, fibrillation, crimped yarn fineness 2000
This was done using denier material. By the way, we conducted two types of tests to test the dust collecting ability of dusters. One is a duster blackening test, and the other is a dust adhesion test. The blackening test is a test to determine the degree of blackening due to adhesion of dust, and the method for calculating the degree of blackening is as follows. Blackening degree = (lightness of the duster before cleaning) - (lightness of the duster after cleaning) / (lightness of the duster before cleaning) x 100 As a result of this blackening degree test, electret defibration and crimping The degree of blackening of the yarn was 44%, and the degree of blackening of the yarn was about 25%. On the other hand, in the dust adhesion performance test, the same weight of dust was uniformly spread using a dust chamber on a smooth black flat plate, and the top was wiped with a duster to determine how much dust could adhere and be removed. This was done by measuring the total weight of the flat plate before and after wiping. As a result, the dust removal rate of the duster that had been made into electret, defibrated, and crimped was 85%, while that of the duster that had not been made into electret was 42%. As is clear from the above description, according to the present invention, by using a blended polymer in which an appropriate amount of polypropylene and polyethylene is mixed as the material for the duster fiber thread, it has excellent dust collection and dust retention properties. Moreover, it is possible to obtain a duster that has good bulkiness, texture, etc., is rich in flexibility, and is extremely easy to use.

[Brief explanation of the drawing]

Figure 1 is a perspective view explaining the structure of the fiber bundle, Figure 2 is a perspective view explaining the structure of the fiber bundle.
The figure is a longitudinal cross-sectional side view of a duster obtained by the method of the present invention. 1... Fiber bundle, 2... Duster material, 2a... Loop part, 3... Thread, 4... Pattern, 5... Frame, 6
...Spiral groove, 7...needle.

Claims (1)

[Claims] 1 A predetermined number of fiber yarns made of synthetic resin such as polypropylene, which have been subjected to stretching, defibration, and crimping processes to form a net shape when expanded, and which are equipped with electricity storage properties, are made into a fiber bundle and arranged in parallel. Then, by binding both ends of the parallel fibers and the two threads in the center with thread, and cutting between the two center threads, a band-shaped duster material is temporarily fixed with one end thread and the other thread. , insert one end of the dusting material into the slot provided at the tip of the handle, roll the material down along the length of the handle, remove the holding thread, and glue the end of the winding to the handle. In the method for manufacturing a duster in which the duster material is housed in a cap and attached to the handle, the synthetic resin fiber thread is made of isotactic polypropylene and polyethylene in a weight ratio.
A film made of a blended polymer mixed at a ratio of 95:5 to 70:30 is stretched, subjected to electret processing, defibration, and crimping processing, and the fiber bundle 1 made by tying the processed yarn is made into a fiber bundle 1 with a predetermined width. The duster material 2 is arranged in a meandering manner so that adjacent fibers are in close contact with each other, and the loop portion is cut and released on one side of the sheet, and the duster material 2 is sewn with thread 3 while leaving the loop portion 2a on the other side. form the loop part 2a side with the handle 4
A method for producing a duster, characterized in that a duster material 2, which is spirally rolled, is attached to a handle 4.