DE2121982A1 - Plastic bobbin case and method and device for their manufacture - Google Patents

Description

Plastic bobbin case and method and device for their production

The invention relates to plastic spool tubes and a \ b? Drive as well as a device for the production of
Rows of recesses on the outer surface of thermoplastic tubes that can be used to make spool tubes.

Depressions in the outer surface of thermoplastic pipes are required in various cases for use as well as for decorative purposes. One such application is the manufacture of plastic sleeves for textile bobbins or coils, as described in US Pat. No. 3,04,374,3. The depressions can
have the form of circumferential grooves arranged in rows parallel to the axis with intermediate axial free surfaces

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are arranged. However, these grooves and the "teeth" assigned to them have ends which extend over the surface of the intermediate axial vacancies are raised. Unfortunately, these opposite ends can be jagged be so that sicn fine threads can get caught, whereby the undisturbed thread output when unwinding with high Speed is impaired.

The invention is therefore intended to create a new kind of art * fabric bobbin tube are created in which the ends of the grooves and the "teeth" at the transition point to the intermediate axial regions essentially is flush. The new bobbin tubes are intended to enable a softer yarn take-off tension, which thereby can be changed that the width and the Zanl of Slot clean is changed. Furthermore, a grooved bobbin case is to be created by the invention, where the groove ends are flush and not get caught of the yarn can take place, the manufacture of the bobbin tube in a continuous process and with should happen at low cost.

The invention is also intended to provide a method and a Device are created through which the outer surface a thermoplastic tube can be deepened to produce such a sleeve.

For a better understanding of the invention, it is described below in conjunction with the accompanying drawings njSher and show:

1, f, 5 and 6, four embodiments of the plastic bobbin case according to the invention

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Fig. 2 and 3 two embodiments of circumferential or Side profiles of the grooved recesses in the surface of the bobbin case in section the line Α · »Α, FIG. 2 showing a chord profile and Fig. 3 shows a crescent-shaped profile, while

Fig. 7 is a schematic view of a preferred embodiment of the invention, partially in Section to show a thorn.

The plastic bobbin case according to the invention according to FIGS. 1, 5, 6 and 7 is characterized in that it has at least two longitudinal rows of grooved recesses in the surface, which rows are separated from one another by free surfaces, which are connected to the ends of the grooves and the corresponding " Teeth "are flush, the circumferential or side profile of these teeth having the shape of a chord or sickle-shaped segment of a circle, as shown in FIGS. + are now provided and have a maximum depth from tip to valley of 0.05 to 0.25 mm (0.002 "- 0.010 ^u ) in the central part, which depth tapers towards the ends so that they are essentially with the free surfaces is flush, as shown at B in Figures 2 and 3, while the width of the aforementioned rows of depressions is about 0.8 to 12.7 mm (about 1/32 "to 1/2"). The grooves can overlap extend the scope or within e at an angle of 10 ° of the circumference of the sleeve. The rows of grooves can be substantially parallel to the axis of the sleeve, or they can spiral around the sleeve at an angle of up to HS. The ranks of

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Depressions can be from one end of the sleeve to the others be continuous or interrupted so that they form shorter strips as shown in Figs.

Preferably, the grooves of the bobbin case at the central parts should have a depth of 0.10 mm to 0.15 mm (0.00H "to 0.006"), which is a case with a diameter of HH, 5 mm (1 3 / H ") results in a row width of about 3.2 mm (about 1/8 ") for a tendon segment and up to 32.7 mm (1/2") for a crescent-shaped segment. The number of grooves is preferably HO-50 per 25 , H mm. The number of rows can vary with the width of the rows, the depth of the grooves and with the diameter of the sleeve and is preferably 3 - 16 rows. For a sleeve with a diameter of HH, 5 mm (1 3 / H ") 6-10 rows 3.2 mm (1/8") wide are particularly preferred. Be ^ L pods with a diameter of 5C, 8 to 76.2 mm (2-3 ") or larger a proportionally larger number of rows is desirable.

In the inventive method for deepening the The outer surface of a thermoplastic pipe is raised to a temperature above the outer surface of the pipe the softening point of the thermoplastic material is heated, at least three embossing wheels each in one separate web rolled over the length of the outer surface of the "pipe, the pipe being supported on a mandrel and at the same time the embossing wheels are pressed against the surface of the pipe in order to

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to form depressions in this.

A device according to the invention for deepening the The outer surface of a thermoplastic pipe has a

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Mandrel and at least three rotating embossing wheels around this Mandrel are arranged around, which latter serves to support a thermoplastic pipe, wherein a heating device is provided, which serves to raise the temperature of the outer surface of the tube via the Increase the softening point of the thermoplastic material, and each embossing wheel has an edge with depressions has, soft edge on the surface of the pipe can roll in a longitudinal direction and pressure exertion * - organs are provided which hold each wheel against the tube keep.

7 shows a mandrel 10 which carries a thermoplastic tube 11. A room in the form of a flat washer 12 is arranged so that the tube 11, carried by the mandrel 10, extends through a circular opening in the center of the disc 12. approaches 13 each with a round opening 14, the axis of which is perpendicular to the axis of the tube 11, are attached to one side of the flat plate 12. A The screw bolt 18 is passed through the bore 14 in each lug 13, and the one closest to the tube 11 End of the screw bolt is on a U-shaped Bracket 17 attached. In each U-shaped bracket 17 is a rotatable stamping wheel 15 (one of six in the illustrated embodiment) with a journal 16 stored, and all wheels 15 rest on the Surface of the tube 11 carried by the mandrel 10. The edges of the embossing wheels 15 have the desired grooved or patterned contour. In the flat disc 12 slots 21- are provided (one slot for each; Stamping wheel), which are used as guides for aligning the Embossing wheels 15 with the tube 11 are used. A spring 19 on each bolt 18 between the; Approach 13

BATH ORIGINAL

and the U-shaped bracket 17 is biased, holds each stamping wheel 15 against the surface of the tube 11. The amount of pretensioning of the springs determines the pressure of the embossing wheels 15 on the tube 11. On the screw bolt 1Ö are also wing nuts 20 to adjust the position of the. Embossing wheels 15 with respect to the tube 11 provided.

During operation, a thermoplastic tube 11, the temperature of which at its outer mustard surface is above the softening point of the thermoplastic material, moves in the direction shown in the drawing between the rotatable stamping wheels 15, which are pressed against the surface of the tube 11 by the pressure of the springs 19 must be pressed. The required temperature on the outer surface of the pipe 11 can be generated, for example, by internal or external radiant heating devices, or the pipe can be pressed out of an extruder and only partially cooled. 'If the embossing wheels 15 on the surface of the tube 11 rolleη (paralIeI to the longitudinal axis of the tube) _r the recesses at the edges of the embossing wheels 15 .bleibend impressed into the surface of the pipe. 11 The maximum depth dev-stamping wheel recesses is regulated by the adjustment of wing nuts 20th The springs 19 can of course be replaced by other equivalent means for regulating the pressure of the stamping wheels 15 on the tube Hj, for example by compressed air or hydraulic cylinders. .

The tube may have a stationary mandrel zwisehen-the rotary embossing wheels are moved or it can be the pipe and erädern with a mandrel between the dreibaren pre ^ be moved or held the cathedral and the Ronr Can stationary _·% during the frame., On arranged the rotatable embossing wheels sin.rl _s along the ro »n-

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res is moved.

The embossing wheels can be freely rotatable or driven so that they "part or all of the Form mechanism for advancing the pipe along the mandrel. The Ranmen 12 for the embossing wheels can in turn rotated so that the rows of depressions are helical rather than straight Eliminate the course. The embossing wheels can not only be spaced apart from one another as shown in the frame 12 (FIG. 7) be arranged, but also in double frames offset from one another so that the tracks of the embossing wheels in closer to each other, but still through free areas are provided separately from each other, or they can be grouped together in combinations of two or more lanes next to each other, GÜ> Free areas only best between the combinations, whereby a pattern of the type shown in Fig. 6 is obtained.

Various modifications of the embodiment according to the invention described above are obvious to the person skilled in the art. For example, the thermoplastic requires Tube 11 does not have an external surface temperature that is above the softening point of the thermoplastic Material lies .if it moves in the direction shown in the drawing. The required The outer surface temperature of the pipe can thereby be achieved that the mandrel 10 is equipped as a heatable mandrel is or the embossing wheels 15 can be heated sufficiently to the surface of an unheated To deepen the pipe. ·

Iis can in the inventive method Ronre from various thermoplastic materials be, for example Ronre made of polyethylene, polypropylene

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len, polyvinyl chloride and its copolymers, celluloses such as cellulose acetobutyrate or an acrylonitrile butadene styrene material (which is known as AßS resin).

The surface of the edges in the axial direction of the embossing wheels, according to the invention for deepening thermoplastic Tubes used is preferably flat. Slightly convex or slightly concave edges can be can also be provided, however, an abrasive effect can be provided (due to unequal surface speeds between the center and the outer edges of the edge) "occur when the concave curvature of the edges is too great.

Embossing wheels with a flat axial surface produce grooves in the tube that have a side profile that is sinew * is shaped, as shown in FIG. 2, with a width in the range from 1.6 to 4.8 mm (1/16 to 3/16 ") * embossing wheels with a concave surface result in flutes that are sickle-shaped in profile and can form herons £ # Form 12.7 mm (1/2 ") wide or wider. The sampling on the outer surface of the test wheels can be continuous or, for example, interrupted in such a way that , the rows of depressions from that shown in FIG Kind be preserved.

The surface of the embossing wheels can have 30 - 70 grooves per inch. These "teeth" grooves can have a triangular, rounded ^ or sinusoidal cross-section This is different, for example a triangular tooth on the stamping wheel can have a rage with a flat base and a

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Form a semicircular rounding between the grooves Such a shaping supports the release of the thread or yarn. The mentioned groove with . Flat ground can be changed in width and for some applications the width is this Anger almost insignificant,

The surface of the embossing wheels can also, although they is preferably grooved, also etched, knurled or sanded or have other embossing patterns that

(1) do not create any kind of formation in the bobbin that would entangle the threads, and

(2) result in a flush, non-tangling transition with the free areas of the clasp sleeves «

The surface temperature of the thermoplastic pipe at the point of the recess changes depending on the kind of the thermoplastic material. Each type or quality of plastic has a different temperature range at which the pipe is sufficiently soft that it can be permanently deformed, but is sufficiently hard to withstand the stresses caused by the marking process in terms of its overall dimensional stability and uniformity. For example, a pipe requires ABS resin is a Oberflächentempe- .._ temperature in the range of 177 ° C to 190 ⁰ C (35O ° F to 375 ° F) wänrend of Eintiefungsvorgangs.

The bobbin tubes according to the invention can optionally are manufactured in such a way that the Prague wheels are replaced by flat patterned stamps, which are pressed against the Koar. These can be the Have the form of patterned metal bands which are in contact with the RoIu? run and at the same time as a pulling mechanism can serve. According to a further modification,

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a heated wire mesh tangential to the surface of the pipe to produce a series of ravages. With yet another embodiment Rollers with a helical thread can be used, or cutting elements, which rotate parallel to the axis of the bobbin case can be used to create a groove pattern in the case surface memorize.

The following example is intended to further explain the invention.

For some forms of putty, a flare at one end of the sleeve is desirable. This can be done, for example, that one end of the tube is heated and the softened end of the "tube is pressed into an inverted shape, through which the tube is turned on itself by 10U to a v / oak flange with a width of 3.2 mm (1/8 ") to form.

example

A tube made of ABS resin with an outside diameter of about H4.5 mm (about 1 * 3/4 ") and a wall thickness of about 0.5 mm (about 0.020") was continuously extracted from an extruder with a temperature of about 18 2 ° C (about 360 ⁰ F), - After pressing, the pipe was pressed through a take-off device over a stationary cooling mandrel (which is carried by the extruder), through a stationary frame, the six rotating stamping wheels of the type shown in the drawing in uniform Wears distances around the outer surface of the tube, and then pulled through a cooling jacket. Then the pipe was cut into certain lengths for

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Twist cut as sleeves for textile bobbins. Each embossing wheel had a cylindrical edge with a width of 6.4 mm (1/4 ") with the following indentations: 4 5 grooves each 25.4 mm running axially across the edge, with a height from the tip to the base of the grooves of 0 , 15 mm (0.006 "). The temperature of the outer surface of the tube at the softening point was about 18 2 ° C (about 350 ⁰ F). Each bobbin tube made as described above had 6 parallel recessed strips 3.2 mm (1/8 ") wide corresponding to the edges of the six embossing wheels which extended the full length of the bobbin (see Fig. 1). The bobbin tubes were then placed on Kötzer and the yarn wound up. No internal slippage of the yarn wound onto these bobbin tubes could be detected.

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Claims (20)

FC-33 -. "* ■ Claims: 1.) Plastic bobbin case> marked by a 'tube, the at least two longitudinal rows of grooved Bears circumferential depressions with free Alternate longitudinal surfaces, which grooves a side profile have, the tendon-shaped or sickle-shaped with a maximum depth from the top to the bottom from 0.05 mm to 0.25 now (0.002 "to 0.010") is .and tapers at each end so that Grooves are essentially flush with the free surfaces, "and the grooves are essentially uniform Distances in the "range of 30 - 70 grooves per 25.4 mm, with the longitudinal rows having a width of 0.8 mm 1/32 "to 1/2" (12.7 mm). 2. Plastic bobbin case according to claim 1, characterized in that the maximum depth of the grooves Is 0.10 mm to 0.15 mm (0.004 "to 0.006"). 3, plastic bobbin case according to claim 1 or 2, characterized in that the number of grooved recesses 40-50 is 25.4 mm each. 4. Method for deepening the outer surface of a thermoplastic tube for the production of the bobbin case according to claims 1-3, characterized by - -12 - 109848/1738 bao draws that the outer surface of the pipe on a Temperature above the softening point of the thermoplastic material is heated, at least three stamps each moved in a separate path over the length of the outer surface of the tube. while the tube is mounted on a mandrel and the embossing units against the surface of the pipe to be pressed in order to remain in this To form depressions. 5. The method according to claim 4, characterized in that that the embossing unit is formed by a wire mesh will. 6. The method according to claim * 4, characterized in that that the embossing units are formed by engraved 'rails or rods that go back and forth move forward .. 7. The method according to claim 4, characterized in that the embossing imperfections are wheels. 8. The method according to claim 7, characterized in that the rolling of the embossing wheels is done that the Ronr is moved over a stationary mandrel through a stationary frame, which the stamping wheels wears the latter at equal intervals around the tube substantially in one to the axis - 13 - ..... ■■ 109848/173 8 ^ ₀ original FC-33 - ⁽ - of the pipe vertical plane are arranged. 9. The method according to claim 7, characterized in that that the rolling of the embossing wheels takes place in that. the pipe on a mandrel and with this through a stationary frame is moved, which carries the embossing wheels at regular intervals are arranged around the tube, essentially in a plane perpendicular to the axis of the tube. 10. The method according to claim 7, characterized in that that the rolling of the embossing wheels takes place in that a frame carrying the embossing wheels over, a stationary tube is moved on a stationary mandrel, the stamping wheels in uniform Spaces around the tube arranged substantially in a plane perpendicular to the axis of the tube are. . 11. The method according to claim 7, characterized in that the heating takes place in that heated Embossing wheels rolled against the outer surface of the tube and pressed. , 12. The method according to claim 6, characterized in that that initially the continuous length ronr is extruded and then the ronr is heated the tube is cooled until the outer surface of the 109848/1738 '" ^: BADORtGiNAL / S Rohres has a temperature suitable for deepening the same, and after deepening that Tube is further cooled. 13. The method according to claim 10, characterized in that that the pipe is subsequently cut into certain lengths will. 14. Verfaliren according to claim 5, characterized in that that the thermoplastic pipe is made of ABS-xiarz. 15. Device for deepening the outer surface of a thermoplastic pipe for producing a bobbin tube according to claims 1-3, characterized by a mandrel (10) and at least three rotatable embossing wheels (15) which are arranged around the mandrel, . which carries a thermoplastic tube (11), with a heating device for increasing the temperature the outer surface of the pipe above the softening point of the thermoplastic material is provided, each embossing wheel (15) has an edge with line depressions and each edge on the surface of the tube can be rolled in a longitudinal direction, and a pressing device (18, 19, 20) is provided by which each stamping wheel (15) is held against the tube will. 16. The device according to claim 13, characterized in that - 15 - 109848/1738 BAO ORtölNAL ... ■ "2T21 that the mandrel (10) is stationary and the rotatable stamping wheels (15) on a surrounding the mandrel stationary .Frame (12) are stored. 17./Vorrichtung according to claim 11, characterized in that a heating device in the rotatable Embossing wheels (Ib) is installed. 18. Apparatus according to claim 12, characterized by an extruder for continuously pressing out the pipe (11) and thus for heating it, a first cooling device for cooling the pipe before deepening its surface, a second Cooling device for further cooling of the pipe after it has deepened its surface, and an exhaust device for the continuously extruded pipe. 19 »Device according to claim 14, characterized in that that the first Küneinrichtung and the mandrel (10) are combined in the form of a cooling mandrel. 20. The device according to claim IS, gekennzeicnnet by a cutting device, through which the pipe in certain lengths can be cut. 21, device according to claims 14, 15 or Io, there- - 113 - 10 9 8 48/1738 ORIGINAL BATHROOM characterized by j that six to 10 rotatable Embossing wheels (15) are provided. 22 «Device according to claim 2, characterized in that that the embossing units are metal strips. 10984 8/1738 _BA D ORIGINAL