GB2028687A - Applicator for molten thermoplastics - Google Patents
Applicator for molten thermoplastics Download PDFInfo
- Publication number
- GB2028687A GB2028687A GB7928561A GB7928561A GB2028687A GB 2028687 A GB2028687 A GB 2028687A GB 7928561 A GB7928561 A GB 7928561A GB 7928561 A GB7928561 A GB 7928561A GB 2028687 A GB2028687 A GB 2028687A
- Authority
- GB
- United Kingdom
- Prior art keywords
- applicator
- sleeve
- bush
- heater
- resistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 229920001169 thermoplastic Polymers 0.000 title claims abstract description 11
- 239000004416 thermosoftening plastic Substances 0.000 title claims abstract description 11
- 239000000463 material Substances 0.000 claims description 5
- 238000012856 packing Methods 0.000 claims description 5
- 239000011324 bead Substances 0.000 claims description 4
- 239000004020 conductor Substances 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 description 9
- 230000001070 adhesive effect Effects 0.000 description 9
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 229910001234 light alloy Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000012768 molten material Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C17/00—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
- B05C17/005—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
- B05C17/00523—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes provided with means to heat the material
- B05C17/00546—Details of the heating means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C17/00—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
- B05C17/005—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
- B05C17/00523—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes provided with means to heat the material
- B05C17/00526—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes provided with means to heat the material the material being supplied to the apparatus in a solid state, e.g. rod, and melted before application
- B05C17/0053—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes provided with means to heat the material the material being supplied to the apparatus in a solid state, e.g. rod, and melted before application the driving means for the material being manual, mechanical or electrical
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Coating Apparatus (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Nozzles (AREA)
Abstract
The applicator comprises a heater sleeve (10), into which a rod (35) of fusible thermoplastic is introduced and is moved towards the outlet orifice (24) of the sleeve. The sleeve is surrounded by a heater resistor (22) which is in turn surrounded by a radiant bush (20) to provide an adequate heat exchange for the temperature of the heater sleeve (10) to remain substantially constant without any need for special regulation. <IMAGE>
Description
SPECIFICATION
Applicators for molten thermoplastics
The present invention relates to applicators for molten thermoplastics.
The invention is particularly but not exclusively applicable to applicators for delivering small quantities of, for example, a thermofusible adhesive which may be introduced into the applicator initially in the form of a solid rod.
The invention provides an applicator for molten thermoplastics, comprising a heater sleeve for receiving a rod of thermoplastics material, a heater resistor surrounding said sleeve, and a radiant bush surrounding said resistor to provide for heat exchange such that the temperature of the heater sleeve remains substantially constant in operation.
In order that the invention may be well understood an embodiment thereof will now be described, by way of example only, with reference to the accompanying drawings in which:
Figure lisa longitudinal cross section through a thermoplastic adhesive applicator;
Figure 2 is an end view of the heater sleeve;
Figure 3 is a section on the Ill-Ill in Figure 2;
Figure 4 shows the heater resistor before it is wound;
Figure 5 shows the wound heater resistor, and
Figure 6 is a sketch showing the assembly of the elastic bush for holding the rod of adhesive.
In the embodiment shown in the drawing, a molten thermoplastics adhesive applicator comprises a frame or body 1 shaped as a gun. The gun butt is connected to the sheath 2 of an electrical supply line, the leads 3 and 4 of which extend to a two-way connecting block or a switch 5 housed in the butt.
The frame is made in two matching halves which are connected along a central plane parallel to the plane of Figure 1 and are held in place by screws fitting in holes 6, which are half plain and half tapped.
At the front, the two halves of the frame are provided with notches 7 arranged in the form of a semi-circle, to enclose an insulating packing 8, which has a groove 9 for this purpose. The packing surrounds a heater sleeve 10, which may be made of light alloy, and which is shown in greater detail in
Figures 2 and 3. The heater sleeve 10 has a cylindrical inlet end 11, the outside of which has two diametrically opposite retaining lugs 12 intended for engagement in corresponding recesses 13, which are suitably lined with insulating material and which are formed in the two halves of the body 1.
Inside the body 1 the heater sleeve has a lug 14 for connection of an earth lead 15 forming part of the electrical line. The leads 3 and 4 of this line are connected to leads 16 and 17 by the block 5. The leads 16 and 17 are taken out of the body 1 through a slot formed in the packing 8.
Outside the body 1 the heater sleeve 10 has an outlet orifice formed in a frusto-conical portion 18 which converges to the exterior and which has at the rear a recess 19 in which engages the front end of a radiant bush 20. The rear end of the radiant bush 20 fits in a recess 21 provided at the front of the packing 8.
The heating resistor 22, which will be described in greater detail subsequently, is connected to the leads 16 and 17, and is housed in the annular space between the heater sleeve 10 and the radiant bush 20.
The front end of the heater sleeve 10 has a cylindrical chamber 23 in which a nozzle 24 coaxial with the sleeve is housed and retained by crimping.
Nozzle 24 contains a non-return valve 25 formed by a ball 251 applied by a spring 252 to a seat 253 disposed at the bottom of the chamber. Nozzle 24 opens on to the exterior by an orifice 241.
As shown in Figures 2 and 3, the inlet 11 and the chamber 23 communicate via a cylindrical bore 26, containing four longitudinal ribs 27 which start at about one-third along the sleeve length near the inlet 11 and then continue to the bottom of the chamber 23.
These ribs have substantially perpendicuiar side faces as can be seen in Figure 2, the section increasing as the ribs extend towards the outlet orifice. The ribs define a cruciform outlet orifice 28 at the bottom of the chamber 23. This form of bore provides a large heating surface inside the sleeve.
The ribs 27 extend substantially over the entire length of that part of the sleeve which is surrounded by heater resistor 22 (Figure 1).
As shown in Figure 6, the inlet 11 of the heater sleeve 10 receives a reduced-thickness end of a bush 29 made from rigid material which is a poor conductor of heat and which preferably has substantially zero thermal conductivity. This rigid bush abuts the end of the sleeve 10 at a shoulder 30.
The other end of the bush 29 is housed in a recess 31 surrounding an aperture 32 formed at the rear of the body 1, and in this recess it bears against the shouldered end of an elastic bush 33 made, for example, of silicone rubber. The elastic bush 33 is free over that part of its length which projects from the body 1 through the aperture 32. The inlet end of the bush 33 has an inner bead 34 or an equivalent raised portion. The inside section of the bush 33 and of the bush 29, and of the bore 26, which is circular in this example are substantially the same and correspond to the cross-section of the rods 35 of adhesive.
Rods 35 of adhesive are introduced from the rear into the bush 33 by expanding the bead 34, so that the rods are clamped by the edge of the elastic bush 33, which is then deformed as the rod is moved along the heater sleeve.
The heater resistor 22 comprises a wire wound helically around an insulating core 221. It is intended to be folded in two at its centre before winding, as shown in Figure 5, and in the region 222 close to the bend the turns are less close together than in the remaining portions, thus avoiding hot spots in the bent part and the short circuiting of any turns.
After bending, the resistor is wound in a double helix around the sleeve 10 and connected to the power supply as shown in Figure 1.
The resistor could also be coiled in a single helix.
In order to use the applicator a rod 35 of adhesive is introduced into the bush 33 and moved towards the outlet orifice by hand pressure on its projecting end. When the applicator is connected to the power supply, the resistor 22 heats up the sleeve 10 and the portion of the rod 35 situated in register with the ribs 27 melts. While pressure is applied to the rear end of the rod, it acts as a piston and presses the liquid adhesive beyond the non-return valve 25 and out of the nozzle 24. The rigid bush 29 made of a material which is a poor heat conductor prevents the molten material from flowing back.
As it moves towards the nozzle, the rod 35 clamped by the bead or raised portion 34 entrains with it the rear portion projecting from the bush 33, so that when pressure is no longer applied to the rod the bush tends to resume its original shape as a result of its elasticity and cause the rod 35 to recede by a few millimetres. This results in suction at the rear of the valve 25 so that the ball 251 is returned to its seat and prevents accidental discharge of adhesive from the nozzle 24. The applicator is therefore clean and economic.
The inward heat dissipation via the ribs 27 and the outward heat dissipation via the radiant bush 20, combined with the structure of the heater resistor 22, provide adequate heat exchange for the temperature of the heater body to be maintained at a substantially constant value, e.g. between 180 and 240 , to within 10 , and this is adequate for proper operation of the applicator. The temperature can be adjusted experimentally. There is therefore no need for a thermostatic system, and this further reduces the cost of the applicator.
Claims (11)
1. An applicator for molten thermoplastics, comprising a heater sleeve for receiving a rod of thermoplastics material, a heater resistor surrounding said sleeve, and a radiant bush surrounding said resistor to provide for heat exchange such that the temperature of the heater sleeve remains substantially constant in operation.
2. An applicator as claimed in claim 1, wherein the heater sleeve comprises a bore with ribs whose section increases towards an outlet orifice of the heater sleeve.
3. An applicator as claimed in claim 2, wherein the ribs each have substantially perpendicular side faces and are arranged so as to form a cruciform outlet orifice.
4. An applicator as claimed in any one of claims 1 to 3, wherein the heater resistor is formed by a wire wound helically around an insulating core, the whole being wound helically around the heater sleeve.
5. An applicator as claimed in claim 4, wherein the resistor is bent in two before it is wound, the turns of the wire being less close together in the area adjacent the bend than in the rest of the resistor.
6. An applicator as claimed in any one of the preceding claims, further comprising an elastic bush at the inlet end of the heater sleeve, said bush being so arranged as to clamp a rod received in the sleeve, the bush being free over part of its length so as to be deformable when the rod is moved along the heater sleeve, and so as to cause the rod to recede when pressure is no longer applied to it, in operation.
7. An applicator as claimed in claim 6, wherein the elastic bush has an inner raised portion at its inlet end.
8. An applicator as claimed in claim 6 or 7, wherein the elastic bush is connected to the heater sleeve by a rigid bush of material which is a poor heat conductor.
9. An applicator as claimed in any one of claims 6 to 8, wherein the elastic bush is disposed partly in the body, its inlet end projecting from the body.
10. An applicator as claimed in any one of the preceding claims, further comprising a gun-shaped body from which the heater sleeve projects, the resistor being disposed around the projecting portion of the sleeve and the radiant bush mounted between a bead on the sleeve and an insulating packing borne bythe body.
11. An applicator for molten thermoplastics substantially as herein described with reference to the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7825010A FR2434653A1 (en) | 1978-08-30 | 1978-08-30 | APPLICATOR OF MELT THERMOPLASTIC MATERIAL |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2028687A true GB2028687A (en) | 1980-03-12 |
Family
ID=9212202
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7928561A Withdrawn GB2028687A (en) | 1978-08-30 | 1979-08-16 | Applicator for molten thermoplastics |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS5534199A (en) |
| BE (1) | BE878477A (en) |
| BR (1) | BR7905562A (en) |
| DE (1) | DE2933509A1 (en) |
| ES (1) | ES245435U (en) |
| FR (1) | FR2434653A1 (en) |
| GB (1) | GB2028687A (en) |
| IT (1) | IT7925029A0 (en) |
| NL (1) | NL7906231A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0055350A2 (en) * | 1980-12-29 | 1982-07-07 | Steinel GmbH & Co. KG | Device for fluidifying a fusible glue |
| EP0077071A1 (en) * | 1981-10-12 | 1983-04-20 | Reinhard Ursprung | Pistol-shaped hand-tool |
| EP0205329A2 (en) * | 1985-06-12 | 1986-12-17 | Bostik Limited | Hot-melt dispensers |
| EP0381440A2 (en) * | 1989-02-02 | 1990-08-08 | Minnesota Mining And Manufacturing Company | Hot melt applicator with anti-drip mechanism |
| EP0699484A3 (en) * | 1994-08-02 | 1996-09-04 | Steinel Gmbh & Co Kg | Apparatus for melting and metered dispensing of thermoplastic adhesive |
| US5688421A (en) * | 1991-10-11 | 1997-11-18 | Walton; William M. | Dispenser for heat-liquefiable material with contiguous PTC heater and heat exchanging member |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2612087B1 (en) * | 1987-03-12 | 1994-05-27 | Ryobi Ltd | CATALYTIC COMBUSTION TYPE ADHESIVE GUN |
| JP4936116B2 (en) * | 2006-10-31 | 2012-05-23 | フィグラ株式会社 | Heater dispenser and heater dispenser container |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3743142A (en) * | 1971-10-08 | 1973-07-03 | Usm Corp | Adhesive extruders |
| JPS5245734B2 (en) * | 1973-06-11 | 1977-11-18 | ||
| US3954206A (en) * | 1974-01-30 | 1976-05-04 | Salonen Albert R | Applicator for extruding molten thermoplastic material |
| US4067481A (en) * | 1976-04-27 | 1978-01-10 | Benjamin Feldman | Hand-holdable gun for longitudinal extrusion of a thermoplastic-type medium therefrom and removable heat sleeve therefor |
| FR2364699A1 (en) * | 1976-09-20 | 1978-04-14 | Sofragraf | Applicator gun for hot melt adhesive - uses solid adhesive stick as piston for melted material with rearward leakage solidifying to form seal |
| US4059204A (en) * | 1976-10-26 | 1977-11-22 | Usm Corporation | System for dispensing and controlling the temperature of hot melt adhesive |
-
1978
- 1978-08-30 FR FR7825010A patent/FR2434653A1/en not_active Withdrawn
-
1979
- 1979-08-07 ES ES1979245435U patent/ES245435U/en active Pending
- 1979-08-09 IT IT7925029A patent/IT7925029A0/en unknown
- 1979-08-15 NL NL7906231A patent/NL7906231A/en not_active Application Discontinuation
- 1979-08-16 GB GB7928561A patent/GB2028687A/en not_active Withdrawn
- 1979-08-18 DE DE19792933509 patent/DE2933509A1/en active Pending
- 1979-08-28 BE BE0/196917A patent/BE878477A/en unknown
- 1979-08-28 JP JP10961579A patent/JPS5534199A/en active Pending
- 1979-08-29 BR BR7905562A patent/BR7905562A/en unknown
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0055350A2 (en) * | 1980-12-29 | 1982-07-07 | Steinel GmbH & Co. KG | Device for fluidifying a fusible glue |
| EP0055350A3 (en) * | 1980-12-29 | 1982-09-08 | Steinel GmbH & Co. KG | Device for fluidifying a fusible glue |
| EP0077071A1 (en) * | 1981-10-12 | 1983-04-20 | Reinhard Ursprung | Pistol-shaped hand-tool |
| EP0205329A2 (en) * | 1985-06-12 | 1986-12-17 | Bostik Limited | Hot-melt dispensers |
| EP0205329A3 (en) * | 1985-06-12 | 1988-01-13 | Bostik Limited | Hot-melt dispensers |
| AU582447B2 (en) * | 1985-06-12 | 1989-03-23 | Emhart Australia Pty. Limited. | Hot melt gun |
| EP0381440A2 (en) * | 1989-02-02 | 1990-08-08 | Minnesota Mining And Manufacturing Company | Hot melt applicator with anti-drip mechanism |
| EP0381440A3 (en) * | 1989-02-02 | 1991-07-03 | Minnesota Mining And Manufacturing Company | Hot melt applicator with anti-drip mechanism |
| US5688421A (en) * | 1991-10-11 | 1997-11-18 | Walton; William M. | Dispenser for heat-liquefiable material with contiguous PTC heater and heat exchanging member |
| EP0699484A3 (en) * | 1994-08-02 | 1996-09-04 | Steinel Gmbh & Co Kg | Apparatus for melting and metered dispensing of thermoplastic adhesive |
| US5725127A (en) * | 1994-08-02 | 1998-03-10 | Steinel Gmbh & Co. Kg | Device for melting and dispensing metered amounts of thermoplastic adhesive |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5534199A (en) | 1980-03-10 |
| FR2434653A1 (en) | 1980-03-28 |
| DE2933509A1 (en) | 1980-03-06 |
| ES245435U (en) | 1980-01-01 |
| NL7906231A (en) | 1980-03-04 |
| BR7905562A (en) | 1980-05-27 |
| IT7925029A0 (en) | 1979-08-09 |
| BE878477A (en) | 1980-02-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |