Patent Application
20240239095
The disclosure relates generally to a heat press suitable for applying a water-based ink print on a substrate, such as a stack of fabric layers of different sizes. This disclosure relates more specifically to a stamp unit configured to be attached to a screen printing head of an inline heat press in which the stamp unit allows the adjustment of the horizontal position of a floating spring-biased platen relative to the horizontal position of a pallet of the screen printing head.
In the garment industry, heat presses are commonly used to imprint a design on a garment, such as on a t-shirt or a sweatshirt. A heat press is used to remove moisture from the garment and the print. For example, after a high-solid acrylic ink foundation is imprinted on the garment, the foundation can be fixed by heat pressing before top colors are applied.
It is preferable that the heat press applies a uniform pressure and temperature to the substrate in various circumstances. For example, U.S. Pat. No. 9,486,995 describes a heat press with a floating spring-biased platen fitting closely inside a rectangular frame that could be attached to a screen printing head. This floating spring-biased platen can accommodate minor variations in garment thickness and apply a more uniform pressure and temperature than a fixed platen.
However, when the thickness variations are caused by a small extra layer of fabric used, for example, for providing a pocket to the garment, the floating spring-biased platen may become less effective than a fixed platen. Indeed, unless the extra layer of fabric is well centered relative to the spring of the floating spring biased platen, some of the springs of the floating spring biased platen will compress significantly more than others, allowing the platen to tilt and causing a pressure relief from a central portion of the extra layer of fabric and a concentration of pressure on a side portion of the extra layer of fabric. Instead, a fixed platen would not tilt and could apply a more uniform pressure and temperature on the extra layer of fabric only. Thus, a fixed platen design could be used to imprint a design on the extra layer of fabric only, provided the extra layer of fabric has a sufficiently uniform thickness. When the extra layer of fabric does not have a sufficiently uniform thickness, such as in the presence of seams, it may become difficult to generate a uniform pressure and temperature suitable for fixing the water-based ink print.
Therefore, there is a need in the art for an improved heat press suitable for applying a print on a substrate, such as a stack of fabric layers of different sizes.
The disclosure describes a stamp unit for use in a heat press, which may include pallets and a screen printing head.
The stamp unit may comprise a frame. The frame may include guide rails. For example, a first end of each of the guide rails is coupled to a first beam, and a second end of each of the guide rails, which is opposite to the first end, is coupled to a second beam. Each of the guide rails may include a beam having at least one slot.
The stamp unit may comprise carriages. Each of the carriages may be capable of sliding in a first direction along one of the guide rails. Each of the carriages may also be capable of being locked to or unlocked from the one of the guide rails. For example, each of the carriages may include a bolt or screw sized to traverse the at least one slot.
The stamp unit may comprise a support attached to all of the carriages.
The stamp unit may comprise a platen. The platen may be coupled to the support so that a horizontal position of the platen relative to the support is fixed, and a vertical position of the platen relative to the support is floating. For example, springs may apply a biasing force pushing the platen away from the support.
The stamp unit may comprise clamps for attaching the frame to the screen printing head of the heat press. The frame may be positioned at various horizontal positions relative to the screen printing head along a second direction, which is perpendicular to the first direction.
After unlocking the carriages from the guide rails, the carriages may slide in the first direction while the frame remains attached to the screen printing head. Thus, the horizontal position of the platen relative to a horizontal position of the pallets and/or the screen printing head may be adjusted.
The disclosure describes a method of using the stamp unit described herein above in a heat press.
The method may comprise the step of attaching the frame to the screen printing head of the heat press. For example, the frame may be positioned at one of various horizontal positions relative to the screen printing head along a second direction, which is perpendicular to the first direction. Then, the frame may be attached to the screen printing head using clamps.
The method may comprise the step of unlocking the carriages from guide rails included in the frame.
The method may comprise the step of sliding the carriages in the first direction along the guide rails while the frame remains attached.
The method may comprise the step of adjusting the horizontal position of the platen relative to a horizontal position of the screen printing head.
When applying a water-based ink print on a substrate, such as a stack of fabric layers of different sizes, the method may comprise the step of allowing vertical movement of the platten relative to the support while preventing horizontal movement of the platen relative to the support.
For a more detailed description of the embodiments of the disclosure, reference will now be made to the accompanying drawings, wherein:
It is to be understood that the following disclosure describes several exemplary embodiments for implementing different features, structures, or functions of the invention. Exemplary embodiments of components, arrangements, and configurations are described below to simplify the disclosure; however, these exemplary embodiments are provided merely as examples and are not intended to limit the scope of the invention. Additionally, the disclosure may repeat reference numerals and/or letters in the various exemplary embodiments and across the Figures provided herein. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various exemplary embodiments and/or configurations discussed in the various Figures. Finally, the exemplary embodiments presented below may be combined in any combination of ways, i.e., any element from one exemplary embodiment may be used in any other exemplary embodiment, without departing from the scope of the disclosure.
In a preferred embodiment, an inline screen printing heat press is capable of flattening a print imprinted on a garment, removing moisture from the garment and the print, and supercharging and heating the pallets of the screen printing press. The inline screen printing heat press is optimized for the use of water-based inks, specifically the removal of moisture from the inks on the heat press. An example of water-based ink is high-solid acrylic ink. This acrylic ink can provide a smoother and gelled foundation for top colors and generate good-quality matte prints. However, water-based ink is just an example of use and is not required for using the inline screen printing heat press.
In use, a layer of white high-solid acrylic ink is first applied in a viscous form on a garment (e.g., the t-shirt 10 shown in
The stamp unit includes a frame (e.g., the frame 18 shown in
The proper centering of the springs relative to any small extra layer of fabric of the garment can lead to a more even distribution of pressure and temperature on the small extra layer of fabric. In order to center the springs relative to any small extra layer of fabric of the garment and limit the tilt of the platen or ironer that may be caused by the extra layer of fabric, a first horizontal position (e.g., the position along the front/back direction 28 shown in
Additionally, a second horizontal position (e.g., the position along the left/right direction 36 shown in
