Method for making a barrel front for a paintball marker
View Patent ↗Disclosed is a method for making a non-metallic, fiber-reinforced barrel tube having particular application for use in a barrel system to be attached to a paintball marker in order to direct paintballs propelled by the marker towards a target. A mandrel is first dipped in a releasing agent. The mandrel is then coated with a thin layer of metal (e.g., nickel or chrome) by means of a nano vapor deposition process. Next, a fiber-reinforced resinous sheet is wrapped over the thin metal layer to establish a tube therearound. A heat-sensitive plastic tape is wound around the tubular resinous sheet. The mandrel is heated in an oven to cause the thin metal layer to bond to the tubular resinous sheet. At the same time, the heat-sensitive tape shrinks to squeeze any air bubbles from the resinous sheet. After heating and curing, the mandrel is pulled outwardly from the tubular fiber-reinforced resinous sheet to produce a hollow, cylindrical barrel tube ready for cutting to size and machining so as to be coupled to the paintball marker.
1. A method for making a hollow barrel tube for use with a paintball marker to direct paintballs propelled by the paintball marker towards a target, said method comprising the steps of:
covering a mandrel with a releasing agent;
coating the mandrel with a layer of metal;
surrounding the metal layer of the mandrel with a resinous sheet to establish a tube therearound;
heating the mandrel, the metal layer, and the tubular resinous sheet for causing said metal layer to bond to said resinous sheet; and
withdrawing the mandrel from the tubular resinous sheet for producing said hollow barrel tube having a longitudinally extending bore with said layer of metal running along the bore through said barrel tube.
2. The method recited in claim 1 , wherein said releasing agent to cover the mandrel is one of a silicone-based oil or grease.
3. The method recited in claim 1 , wherein said layer of metal to coat the mandrel is one of nickel or chrome.
4. The method recited in claim 1 , comprising the additional step of coating the mandrel with said layer of metal by means of nano vapor deposition.
5. The method recited in claim 1 , wherein the step of heating the mandrel, the metal layer, and the tubular resinous sheet includes applying heat thereto at a first temperature for a first heating time and then applying heat thereto at a raised temperature for an additional heating time so as to cause said metal layer to bond to said resinous sheet.
6. The method recited in claim 1 , wherein said resinous sheet includes non-metallic fibers embedded within a resin.
7. The method recited in claim 6 , wherein said resin is epoxy resin and said non-metallic fibers are manufactured from one of carbon or glass.
8. The method recited in claim 1 , comprising the additional steps of winding a heat-sensitive tape over said tubular resinous sheet surrounding said metal layer of the mandrel prior to said heating step, and heating said heat-sensitive tape together with said resinous sheet during said heating step for causing said tape to shrink around and apply pressure to said resinous sheet.
9. The method recited in claim 8 , comprising the additional step of grinding said heat-sensitive tape off said tubular resinous sheet after the step of heating said heat-sensitive tape together with said resinous sheet.
10. The method recited in claim 1 , comprising the additional steps of cutting off one or both of the opposite ends and machining said tubular resinous sheet following said mandrel withdrawing step so that the hollow barrel tube is adapted and sized to be coupled to the paintball marker.